Abstract

Disclosed is a rigid-flexible coupled continuum robot unit and a continuum robot. In the rigid-flexible coupled continuum robot unit, structural unit blocks are staggered and interconnected to constitute an entire manipulator; two ends of a flexible nickel-titanium rod are respectively connected with two adjacent structural unit blocks; a front-end unit block is arranged at a foremost end of the manipulator; and a rear-end unit block is arranged at a rearmost end of the manipulator. When in use, a memory alloy nickel-titanium rod forms a flexible joint, a limiting clamping jaw and a limiting boss form a rigid joint, the two complement each other, after a drive wire applies pressure, the limiting clamping jaw and the limiting boss are in a wrapping relationship, a motion trail of the robot unit is limited, such that the robot unit always rotates around a center of rotation along an arc.

IPC Classes  ?

• B25J 9/06 - Programme-controlled manipulators characterised by multi-articulated arms
• B25J 9/00 - Programme-controlled manipulators
• B25J 15/00 - Gripping heads
• B25J 19/02 - Sensing devices

Abstract

Disclosed in the present disclosure are a heat dissipation device for a high-current vacuum interrupter and a manufacturing method therefor. The heat dissipation device includes a mobile-end heat dissipation structure and a stationary-end heat dissipation structure which are disposed at two ends of the vacuum interrupter, and the heat dissipation device is manufactured by a method of combining additive manufacturing with subtractive manufacturing. The heat dissipation device is high in precision and high in machining efficiency, and the structure of the heat dissipation device can be flexibly designed according to actual needs, significantly reducing the production cost of the heat dissipation device, which is of great significance in practice.

IPC Classes  ?

• H01H 33/66 - Vacuum switches

Abstract

Disclosed is a birfield flexible variable-stiffness continuum robot unit and a continuum robot. In the birfield flexible variable-stiffness continuum robot unit, main structural units are interconnected to constitute a continuum manipulator; joint connecting structures connect the two adjacent main structural units; a front-end unit is arranged at a foremost end of the manipulator; and a rear-end unit is arranged at a rearmost end of the manipulator. When in use, birfield joint design is adopted, a single joint has two degrees of freedom, is more flexible and variable, and the adjacent structural units rotate around a center of a sphere, so that modeling is simpler and more convenient; connection design of flexible springs is further adopted, certain stiffness is provided for the manipulator, and thus the manipulator has a variable-stiffness characteristic; and meanwhile, a roll ball structure makes the manipulator have high torsional resistance.

IPC Classes  ?

• B25J 9/06 - Programme-controlled manipulators characterised by multi-articulated arms
• B25J 9/00 - Programme-controlled manipulators
• B25J 9/10 - Programme-controlled manipulators characterised by positioning means for manipulator elements
• B25J 15/00 - Gripping heads
• B25J 19/02 - Sensing devices

Abstract

A mechanical pump-free flow boiling heat sink, including an evaporator, a two-phase flow steam injector, a first condenser, a boiling pool and a second condenser. A vapor outlet of the evaporator is communicated with a vapor-phase inlet of the two-phase flow steam injector. A liquid-phase outlet of the evaporator is communicated with an inlet of the boiling pool. An outlet of the boiling pool is communicated with an inlet of the second condenser. An outlet of the second condenser is communicated with a liquid-phase inlet of the two-phase flow steam injector. An outlet of the two-phase flow steam injector is communicated with an inlet of the first condenser. An outlet of the first condenser is communicated with an inlet of the evaporator.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

Disclosed is a method and system for forward synthesis of a digital predistortion nonlinear model derived from a circuit description, used for nonlinear modeling of a power amplifier. The method includes establishing a frequency band-continuous time-domain expression, transforming the frequency band expression to a baseband expression, and transforming the baseband-continuous time-domain expression to a baseband-discrete time-domain expression. The present disclosure can obtain the DPD nonlinear model by forward synthesis, provide an accurate model structure and initial parameter values for establishing the RF power amplifier model in the power amplifier nonlinear predistortion technology, make full use of the prior knowledge of the RF power amplifier system to obtain the nonlinear model structure that best conforms to the physical essence, and directly obtain the minimum memory depth and nonlinear order, and can be integrated into an RF power amplifier circuit simulation software.

IPC Classes  ?

• G06F 30/327 - Logic synthesisBehaviour synthesis, e.g. mapping logic, HDL to netlist, high-level language to RTL or netlist

Abstract

Disclosed in the present invention is a construction system for a big data analysis algorithm library, comprising: an analysis process construction module, an operator platform selection module, a code reverse generation module, a user code verification module, a cluster control host, and a cluster computing host. Cross-platform and cross-language algorithm fusion can be realized, and data analysis is realized in a complete and heterogeneous data analysis flow. Also disclosed in the present invention is a construction method for a big data analysis algorithm library.

IPC Classes  ?

• G06F 8/10 - Requirements analysisSpecification techniques
• G06F 8/20 - Software design
• G06F 8/34 - Graphical or visual programming

Abstract

Disclosed are a parallel electron swarm parameter calculation method taking ion dynamics into consideration, and related apparatus. The method includes: measuring a discharge current waveform of gas under a reduced field intensity, and obtaining a measured current waveform; establishing an electron avalanche space-time development model of a coupled electron charge density and different types of ion charge densities; computing the discharge current waveform of the gas under the reduced field intensity through a finite volume method according to the electron avalanche space-time development model, and obtaining a computed current waveform; and computing the electron swarm parameters of the gas under the reduced field intensity with a minimum deviation between the measured current waveform and the computed current waveform as an optimization target through a genetic algorithm.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage
• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
• G06F 30/25 - Design optimisation, verification or simulation using particle-based methods
• H05H 1/00 - Generating plasmaHandling plasma

Abstract

A rapid multiphysics inversion method and apparatus for a power device, a device and a storage medium, relating to the technical field of power device inversion. The method comprises: using simulation software to construct a multiphysics simulation model of a power device; constructing a data set on the basis of a predefined input parameter set and output parameter set; by means of using a preset data order reduction method, performing order reduction on the data set, so as to obtain an order-reduced data set and an order reduction matrix; by means of using a preset inversion method, fitting the relationship between the order-reduced data set and the input parameter set, so as to obtain an inversion coefficient matrix; and on the basis of the order reduction matrix, the inversion coefficient matrix and an input parameter set to be inverted, performing rapid inversion on the multiphysics simulation model, so as to obtain a multiphysics inversion result of the power device. The present invention can obviously reduce the amount of calculation while satisfying calculation precision, achieves high calculation efficiency, and can adapt to the requirements for online monitoring and real-time simulation of power devices.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G06F 30/27 - Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model

Abstract

A system and method for online measurement of junction temperature of a semiconductor device, and a controller. The measurement system comprises a controller, an online measurement circuit (200), and a measurement module for extracting saturated drain electrode current information of a device under test (100). One end of the online measurement circuit (200) is connected to a drain electrode (103) of said device (100), and the other end of the online measurement circuit (200) is connected to a source electrode (104) of said device (100). When said device (100) enters a saturation region for operation, an energy storage element (204) in the online measurement circuit (200) automatically injects current into the drain electrode (103) of said device (100), so that a drain electrode current of said device (100) rises. The controller is connected to the measurement module. On the basis of the saturated drain electrode current information of said device (100) extracted by the measurement module, the controller determines the junction temperature of said device (100). By using the described system and method and the controller, the junction temperature of a semiconductor device can be detected online, and the system, method, and controller have the characteristics of low costs, high precision, high sensitivity, and high response speed.

IPC Classes  ?

• G01R 31/26 - Testing of individual semiconductor devices
• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
• G01K 7/01 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using semiconducting elements having PN junctions

Abstract

Disclosed are a system and method for online detection of a junction temperature of a semiconductor device, and a controller. The system includes a controller, an online measurement circuit, and a detection module configured to extract saturated drain current information of a device under test; one end of the online measurement circuit is connected to a drain of the device under test; the other end of the online measurement circuit is connected to a source of the device under test; when the device under test enters a saturation region to operate, an energy storage element in the online measurement circuit spontaneously injects current into the drain of the device under test, so that the drain current of the device under test rises; the controller determines the junction temperature of the device under test according to the saturated drain current information of the device under test extracted by the detection module.

IPC Classes  ?

• G01K 7/01 - Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat using semiconducting elements having PN junctions

Abstract

A wedge-shaped manifold microchannel heat sink with micro pin fins, including a first cover plate, a second cover plate, a manifold substrate and a microchannel substrate that are sequentially arranged from top to bottom. The first cover plate is provided with a first inlet channel. The second cover plate is provided with a second inlet channel and a first outlet channel. The manifold substrate is provided with a third inlet channel and a second outlet channel. The microchannel substrate is provided with a plurality of rows of micro pin fins. A microchannel is formed between any two adjacent rows of micro pin fins.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

A gravity- and micro-nano structure-enhanced thermosyphon heat sink, including a base plate at an evaporation side. A heat dissipation assembly is provided at a top side of the base plate. Fixing assemblies are arranged on two sides and top of the heat dissipation assembly. The base plate has a box-shaped structure. Four corners of the base plate are each provided with a positioning bolt hole. A plurality of support posts and a reinforcement structure are arranged within the base plate. A side wall of the base plate is provided with a port for evacuation and fluid filling.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

The present invention relates to the technical field of proton exchange membrane fuel cells. Disclosed are a fuel cell parameter identification method and apparatus, and a device and a storage medium. The method comprises the following steps: constructing a semi-empirical model for a proton exchange membrane fuel cell; calculating a theoretical value of an output voltage of the semi-empirical model, and constructing an objective function by means of a mean square error between the theoretical value and an actual value of the output voltage of the semi-empirical model; on the basis of the semi-empirical model, determining a plurality of parameters to be identified, and using said plurality of parameters as decision variables to construct a plurality of constraint conditions for the objective function; on the basis of the plurality of constraint conditions, constructing an optimization model for the proton exchange membrane fuel cell by using the minimization of the objective function as an optimization objective and using said plurality of parameters as variables to be solved; and solving the optimization model by means of a multi-policy sparrow search optimization algorithm, so as to obtain a plurality of optimal parameters to be identified. In the multi-policy sparrow search optimization algorithm in the present invention, Tent chaotic mapping is introduced to initialize a population, the number of populations is increased, and then the two populations are merged. An adaptive feedback mechanism is added in a follower position update stage and a vigilant position update stage, thereby reducing the convergence accuracy under a limited number of iterations. A DE/best/1 mutation policy and a dynamic scaling factor sf are used to update the position of a sparrow. The global optimization capability and the local optimization capability of an algorithm are improved, thereby also improving the accuracy of fuel cell parameter identification.

IPC Classes  ?

• G06F 30/27 - Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model

Abstract

A differential matching prefetcher for coping with irregular memory access includes: an access index table, an access target table, a differential matching module, an index queue, an indirect memory access candidate scoreboard, an address generator, an indirect memory access relationship table, a prefetch status handling register, a repetition filter, a continuous address filter, and a range prefetch table. The differential matching prefetcher is configured to monitor events of access requests and data responses between a computing core and a first level of cache, as well as between the first level of cache and a second level of cache. The differential matching prefetcher may be applied in various general-purpose computing architectures adopting a hierarchical storage design to realize mode capture and data prefetch for irregular indirect memory access, reduce long-delay storage access overhead caused by the irregular memory access, and increase instructions per cycle (IPC) of the computing architectures.

IPC Classes  ?

• G06F 12/0862 - Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches with prefetch
• G06F 9/32 - Address formation of the next instruction, e.g. by incrementing the instruction counter
• G06F 12/02 - Addressing or allocationRelocation
• G06F 12/0811 - Multiuser, multiprocessor or multiprocessing cache systems with multilevel cache hierarchies

Abstract

Disclosed in the present invention is a power grid security communication method based on multi-resource hybrid quantum key distribution, comprising the following steps: 1, analyzing communication processes of a satellite quantum key distribution mode, an optical fiber quantum key distribution mode and a wireless quantum key distribution mode; 2, establishing a power secure communication network architecture based on satellite-optical fiber-wireless hybrid quantum key distribution; 3, on the basis of the power secure communication network architecture, establishing a quantum resource optimization deployment model; 4, establishing an objective function of the model to be a minimum information risk index; 5, establishing constraint conditions of the model: comprising a single quantum key distribution constraint, a hybrid quantum key distribution constraint, a deployment cost constraint, a communication demand constraint and a quantum information flow constraint; and 6, converting the established model into a mixed-integer linear programming form, and solving same to obtain a quantum resource optimization deployment and scheduling solution. The present invention relates to a power communication method for improving information security by considering the synergistic effect of hybrid quantum key distribution (QKD) and power service demand features, and fusing satellite, optical fiber and wireless QKD.

IPC Classes  ?

• H04L 9/08 - Key distribution

Abstract

An ultrahigh-speed bar precision shearing device adopting a type of alternating current servo motors driving a flywheel to spirally compress nitrogen for energy storage includes a frame structure, a high-pressure air chamber mechanism, a hammer head movement mechanism and a mold are installed on the frame structure from top to bottom, the high-pressure air chamber mechanism cooperates with the hammer head movement mechanism to strike the mold, and bars are cut off and separated under the effect of the mold. The present application omits a complex hydraulic driving system, and ultrahigh-speed striking (20-30 m/s) of a hammer head is achieved in a manner of a flywheel spirally compressing nitrogen for energy storage; and control is simple, the return speed of the hammer head is high, and the energy utilization rate is high.

IPC Classes  ?

• B30B 1/18 - Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
• B30B 1/23 - Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means operated by fluid-pressure means

Abstract

An all-silicon carbide micro-electro-mechanical system (MEMS) acceleration-pressure integrated sensor chip includes a first patterned silicon carbide plate, a MEMS acceleration sensor chip, a second patterned silicon carbide plate, a MEMS pressure sensor chip and a third patterned silicon carbide plate fixedly connected in sequence. The MEMS acceleration sensor chip has an eight-beam and five-mass-block structure. The MEMS pressure sensor chip includes an arc-shaped cross beam and four circular diaphragms. A method for preparing the integrated sensor chip is also provided.

IPC Classes  ?

• B81B 3/00 - Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
• B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate

Abstract

2/g and a particle size of 15-25 mm; the method includes the following steps: loading micron zero-valent iron particles on the surface of micron activated carbon particles by using the bonding effect of a bonding agent, stirring, granulating and drying to obtain the product.

IPC Classes  ?

• C02F 3/12 - Activated sludge processes

Abstract

A method for identifying the grade of a highly radioactive metal material in a nuclear power plant. The method comprises the steps of: S1, using a laser-induced breakdown spectroscopy apparatus to perform spectrum collection on a radioactive metal material, so as to obtain average spectral information of the radioactive metal material; S2, performing similarity calculation on the obtained average spectral information of the radioactive metal material and the spectrum of a selected material of a known grade, so as to obtain a composite similarity; and S3, determining the grade of the radioactive metal material on the basis of the composite similarity. Rapid evaluation of the grade of a metal material independent of component analysis is realized, and the evaluation is quick in terms of speed and high in terms of accuracy.

IPC Classes  ?

• G01N 21/71 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited

Abstract

The present disclosure discloses a method for interrupting a circuit breaker, wherein the circuit breaker comprises a transfer branch and a current-carrying branch which are connected in parallel, the transfer branch comprising an oscillation circuit formed by a transfer capacitor and an inductor and a conduction circuit connected in series with the oscillation circuit, and the method comprises the following steps: S100: when a fault current in the current-carrying branch decreases, controlling the conduction circuit in the transfer branch to conduct, and forming a loop by the conduction circuit after conduction with the oscillation circuit and the current-carrying branch; S200: forming a transfer current continuously oscillating through oscillating discharge of the oscillation circuit, and injecting the transfer current into the current-carrying branch through the loop.

IPC Classes  ?

• H02H 3/05 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection Details with means for increasing reliability, e.g. redundancy arrangements
• H02H 3/02 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection Details
• H02H 3/16 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to fault current to earth, frame or mass

Abstract

The present invention relates to the technical field of magnetron sputtering process, and specifically to a method for improving the uniformity of rare earth nickelate thin film deposited by reactive magnetron sputtering, comprising the following steps: adjusting the sputter angle of a Ni target toward a substrate to perform magnetron sputtering to deposit a thin film, and obtaining the content data of the Ni element in the deposited thin film; analyzing the content data of the Ni element to screen out the sputter angle for realizing zero-gradient deposition of the Ni element on the substrate surface; similarly, screening out the sputter angle for realizing zero-gradient deposition of the RE element on the substrate surface; preparing a nickelate thin film according to the screened zero-gradient sputter angle of Ni target material and the RE target material so as to improve the deposition uniformity of the rare earth nickelate thin film. The present invention aims to solve the problem that the introduction of reactive gas in the state of art magnetron sputtering process compromises the uniformity of the product thin film.

IPC Classes  ?

• C23C 14/54 - Controlling or regulating the coating process
• C23C 14/08 - Oxides
• C23C 14/34 - Sputtering
• C23C 14/35 - Sputtering by application of a magnetic field, e.g. magnetron sputtering

Abstract

Disclosed in the present invention are an optimal operation method and apparatus for a multi-category energy subsystem of an urban energy internet. The method comprises: dividing an urban energy internet into a main power grid layer and a micro-energy subsystem layer considering energy classification, and respectively establishing corresponding optimal operation models for the main power grid layer and the micro-energy subsystem layer considering energy classification; using prediction data of a load and a renewable energy output in the urban energy internet to solve the optimal operation model corresponding to the main power grid layer, so as to obtain an optimal operation parameter of a main power grid; using a model prediction control method and the optimal operation parameter of the main power grid to solve, multiple times, the optimal operation model corresponding to the micro-energy subsystem layer considering energy classification, so as to obtain an optimal operation parameter sequence of micro-energy subsystems after each solution, and ending the solution after an optimal scheduling scheme for one scheduling period is generated. The present invention aims to effectively solve the scheduling operation problem of an urban energy internet by means of considering energy classification.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply

Abstract

A portable air conditioner, comprising an outdoor portion, an indoor portion and a water-lifting assembly, wherein the indoor portion and the outdoor portion are stacked; the water-lifting assembly is arranged in the outdoor portion; the water-lifting assembly comprises a first driving member, a first rotary shaft and a rotary wheel; the first rotary shaft is in transmission connection with the first driving member; at least part of the rotary wheel is located in a water-collecting member; the rotary wheel comprises a reinforcement member and a plurality of first atomization members; the reinforcement member is in transmission connection with the first rotary shaft; the reinforcement member comprises a first main body and a plurality of water intake holes; the plurality of water intake holes are provided in the first main body, and are spaced apart from each other in the circumferential direction of the first main body; the plurality of first atomization members are arranged in the reinforcement member; and each of the plurality of first atomization members comprises a second main body and a plurality of first atomization holes.

IPC Classes  ?

• F24F 1/039 - Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing using water to enhance cooling, e.g. spraying onto condensers
• F24F 13/22 - Means for preventing condensation or evacuating condensate
• F24F 1/02 - Self-contained room units for air-conditioning, i.e. with all apparatus for treatment installed in a common casing

Abstract

An embodiment of the present invention provides a non-invasive radio frequency microwave brain intervention device. The device comprises an LED display screen, used for selecting an initial waveform to be generated and setting time; an STM 32 single-chip microcomputer, wherein one end of the STM32 single-chip microcomputer is connected to the LED display screen and used for generating an initial waveform; an LMX 2594 chip, wherein one end of the LMX 2594 chip is connected to the other end of the STM32 single-chip microcomputer and used for generating and sending an intervention signal according to the initial waveform, processed biological conductance data of a human body and temperature data; an adjustable power amplifier, wherein one end of the adjustable power amplifier is connected to the other end of the LMX 2594 chip and used for receiving the intervention signal and amplifying the intervention signal; and a thin film lens microstrip line, connected to the other end of the adjustable power amplifier and used for radiating the amplified intervention signal to the human brain so as to complete a single intervention stimulation on the human brain. According to the present invention, the focusing accuracy of the brain intervention stimulation area is improved, the energy consumption is reduced, and the safety of brain intervention stimulation is improved.

IPC Classes  ?

• A61N 5/02 - Radiation therapy using microwaves

Abstract

The present application relates to the technical field of CT imaging, and in particular to a multi-center scanning CT imaging geometric structure and a projection partial differential equation under a circular trajectory. The CT imaging geometric structure is a CT imaging structure under a circular trajectory composed of N groups of scanning geometric structures, wherein each group of scanning geometric structures comprises one rotation center and M light source positions at different angles; each light source position corresponds to D detector units; and the CT imaging structure comprises N rotation centers, and the N rotation centers are distributed in a certain pattern. Under multi-center scanning geometry, a partial differential equation is used to perform interpolation extension on a projection. By means of the multi-center scanning CT imaging geometric structure provided in the present application, streak artifacts of images under sparse angle sampling conditions are reduced on the basis of a projection interpolation scheme of the structure and a projection partial differential equation under a circular trajectory, thereby improving image quality. The present application is used for decreasing the number of projection angles in CT scanning, reducing a radiation dose, reducing system costs and improving a scanning speed.

IPC Classes  ?

• G06T 11/00 - 2D [Two Dimensional] image generation

Abstract

An air conditioner (1000), wherein a compressor (201), a heat exchanger, a throttling assembly and a flow division assembly (500) are connected to form a refrigerant loop. The flow division assembly (500) comprises a first pipeline (510), a plurality of second pipelines (520) and a flow division member (530). A first end of the first pipeline (510) is connected to the compressor (201), and a second end of the first pipeline is connected to a first end of the flow division member (530). First ends of the plurality of second pipelines (520) are connected to the heat exchanger, and second ends of the plurality of second pipelines are connected to a second end of the flow division member (530). The flow division member (530) comprises different numbers of flow division channels, the flow division channels being in communication with the first pipeline (510) and the plurality of second pipelines (520). The flow division member (530) is configured to switch between different numbers of flow division channels, on the basis of the flow direction of the refrigerant and at least one of the workloads of the heat exchanger.

IPC Classes  ?

• F25B 41/48 - Arrangements for diverging or converging flows, e.g. branch lines or junctions for flow path resistance control on the downstream side of the diverging point, e.g. by an orifice

Abstract

Disclosed in the present invention are a digital pre-distortion nonlinear model forward synthesis method derived from circuit description, and a system. Main steps of the method comprise: establishing a frequency band continuous time domain expression, converting the frequency band expression to a baseband expression, converting a baseband continuous time domain expression to a baseband discrete time domain expression, etc. By means of equivalent circuit models of existing radio frequency power amplifier systems, the present invention can forwardly synthesize a corresponding digital pre-distortion nonlinear model, thus providing an accurate model structure and initial parameter values for the establishment of a radio frequency power amplifier model in power amplifier nonlinear pre-distortion technology. The present invention can fully utilize priori knowledge of radio frequency power amplifier systems to obtain a nonlinear model structure most conforming to the nature of physics, can directly obtain the minimum memory depth and nonlinear orders, and can integrate same in radio frequency power amplifier circuit simulation software.

IPC Classes  ?

• G06F 30/367 - Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods

Abstract

The present invention belongs to the field of the preparation of anti-rhinitis drugs. Disclosed in the present invention is the use of a Corydalis rhizoma–Angelicae dahuricae radix extract in the preparation of a drug for treating rhinitis. The Corydalis rhizoma–Angelicae dahuricae radix extract has a clear therapeutic effect on improving symptoms of rhinitis, and the effect is superior to that of the common clinical drug dexamethasone. The therapeutic effect of the drug on rhinitis is evaluated by means of comparing the number of times of nasal scratching, the number of sneezes and the IgE release amount of a nasal lavage fluid; and it is determined that a Corydalis rhizoma–Angelicae dahuricae radix extract formed from Corydalis rhizoma praeparatum and Angelicae dahuricae radix at a mass ratio of 1:1 can improve the symptoms of allergic rhinitis, and can be used in the preparation of a drug for treating rhinitis. The pharmaceutical combination at the ratio of 1:1 has a better effect than Corydalis rhizoma processed with vinegar and Angelicae dahuricae radix alone or a pharmaceutical combination at the ratio of 2:1, thereby exerting a synergistic role, and has lower toxicity than using one drug component alone, thereby exerting an effect of reducing toxicity.

IPC Classes  ?

• A61K 36/66 - Papaveraceae (Poppy family), e.g. bloodroot
• A61K 36/232 - Angelica
• A61P 11/02 - Nasal agents, e.g. decongestants
• A61P 37/08 - Antiallergic agents

Abstract

A use of tetrahydropalmatine in the preparation of a drug for treating atopic dermatitis. The treatment of atopic dermatitis with tetrahydropalmatine is researched. The research shows that tetrahydropalmatine can significantly improve atopic dermatitis caused by calcipotriol and inhibit skin epidermal barrier damage, pruritus factor release and inflammatory factor release caused by tetrahydropalmatine, so that tetrahydropalmatine can be used for the treatment of atopic dermatitis.

IPC Classes  ?

• A61K 31/4375 - Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom ortho- or peri-condensed with heterocyclic ring systems the heterocyclic ring system containing a six-membered ring having nitrogen as a ring hetero atom, e.g. quinolizines, naphthyridines, berberine, vincamine
• A61P 17/00 - Drugs for dermatological disorders
• A61P 17/04 - Antipruritics

Abstract

lll+1 plate-type heat exchanger and a cooling liquid outlet via a three-way valve, and a cooling liquid heat exchange channel outlet of the Nth plate-type heat exchanger is communicated with the cooling liquid outlet; and a refrigerant inlet is communicated with a refrigerant outlet via refrigerant heat exchange channels from the Nth to the first plate-type heat exchanger in sequence. The technical solution of the present invention improves overall system performance.

IPC Classes  ?

• B60H 1/00 - Heating, cooling or ventilating devices
• F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
• F24F 5/00 - Air-conditioning systems or apparatus not covered by group or

Abstract

The present invention aims to provide a use of a Corydalis yanhusuo-Angelica dahurica extract in the preparation of an anti-atopic dermatitis drug. The research result of the present invention shows that the Corydalis yanhusuo-Angelica dahurica extract can effectively treat atopic dermatitis, and the treatment effect of the Corydalis yanhusuo-Angelica dahurica extract is superior to the effect of the use of Corydalis yanhusuo and Angelica dahurica alone. An Angelica dahurica extract has almost no effect on atopic dermatitis when being used alone, but can obviously improve the treatment effect of a Corydalis yanhusuo extract when being used in combination with the Corydalis yanhusuo extract, and the administration dosages of Corydalis yanhusuo and Angelica dahurica in drug combination are reduced compared with those when used alone, indicating that the Corydalis yanhusuo extract and the Angelica dahurica extract achieve the effects of reducing toxicity and enhancing efficacy.

IPC Classes  ?

• A61K 36/66 - Papaveraceae (Poppy family), e.g. bloodroot
• A61K 36/232 - Angelica
• A61P 17/00 - Drugs for dermatological disorders
• A61P 17/04 - Antipruritics

Abstract

The present invention discloses a multi-dimensional laser scanning processing device and method, which includes a horizontally arranged laser beam, a turning optical path module arranged at one end of the laser beam along a horizontal direction. The turning optical path module is used to deflect the laser beam by 90°, which is then arranged to enter a deflection module. The deflection module is used to deflect the laser beam by 90° again so that it enters the beam expansion module along the horizontal direction. The beam expansion module 4 is arranged to expand a beam radius of the laser beam to a certain multiple, which then enters the plane scanning module, and finally enters the focusing module to converge into an ideal spot. The present invention can realize the changes of focused laser beam in the XYZ space and the two inclination angles α and β of the optical axis.

IPC Classes  ?

• B23K 26/70 - Auxiliary operations or equipment
• B23K 26/06 - Shaping the laser beam, e.g. by masks or multi-focusing
• B23K 26/082 - Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head

Abstract

A method for detecting breakdown vacuum level of a composite breakdown path includes steps of: based on a fact that different electrode shapes provide different electric field strengths, designing the composite breakdown path according to breakdown voltage characteristic differences of different breakdown paths; and based on breakdown results of different electrode structures in the different breakdown paths, performing vacuum interrupter vacuum level measurement and calibration. Based on the fact that there are large differences in the breakdown voltages of different electrode gaps under different vacuum conditions, the method can improve the vacuum level detection accuracy of high-voltage vacuum interrupter through the measurement and judgment of breakdown voltages between multiple different electrodes, and can complete the breakdown judgment under the insulating gas environment with high vacuum level or complete leakage, thereby promoting the development of vacuum level detection method for high-voltage vacuum interrupter.

IPC Classes  ?

• H01H 33/668 - Means for obtaining or monitoring the vacuum
• H01H 33/662 - Housings or protective screens

Abstract

Provided are a method, an apparatus, and a system for risk assessment of an insulation state of electrical equipment and a storage medium. The method includes measuring partial discharge data of electrical equipment using multiple types of sensors, and performing clustering of discharge types; establishing, based on a clustering result of each discharge type, a regression model between sensor response amplitude and apparent discharge energy during a discharge development process; calculating, based on the regression model, the accumulated value of apparent discharge energy of current partial discharge of the electrical equipment, and using the accumulated value as an index of risk assessment to assess an insulation state of the electrical equipment.

IPC Classes  ?

• G01R 31/12 - Testing dielectric strength or breakdown voltage

Abstract

A sterile metered-dose eye drop vial, comprising: a vial body (100); a supporting member (200), mounted at the vial opening of the vial body (100) and communicated with the inner cavity of the vial body (100); a vial cap (300), provided with a liquid-dropping opening (310) and connected to the vial body (100), the vial cap (300) being internally provided with a first accommodating cavity (320) and a second accommodating cavity (330), and being configured to slidingly switch between a first position and a second position under the action of an external force; a core column (400), one end of which is connected to the supporting member (200), and the other end of which blocks the liquid-dropping opening (310) when the vial cap (300) is located at the first position and is disengaged from the liquid-dropping opening (310) when the vial cap (300) is located at the second position. The sterile metered-dose eye drop vial prevents bacteria in external air from entering an eye drop in the vial body (100), thereby achieving sterile preservation of the eye drop without needing a bacteriostatic agent; additionally, the eye drop vial keeps the flow rate of eye drops dripping into eyes constant every time.

IPC Classes  ?

• A61F 9/00 - Methods or devices for treatment of the eyesDevices for putting in contact-lensesDevices to correct squintingApparatus to guide the blindProtective devices for the eyes, carried on the body or in the hand
• A61J 1/05 - Containers specially adapted for medical or pharmaceutical purposes for collecting, storing or administering blood, plasma or medical fluids

Abstract

Disclosed in the present invention is a vertical-shiplift mounting and positioning method. The method comprises: designing a vertical-shiplift mounting and positioning reference network by means of a structure arrangement position of a shiplift; then, by means of the cooperation between a plurality of total stations and reference points, sequentially determining reference positioning points for the axis of an unobstructed section of a base plate of the shiplift, and mounting and positioning control points, wherein when point positions are determined, a step-wise manner is used, and previously determined point positions are used as reference points to determine subsequent point positions; and sequentially embedding positioning reference point apparatuses and positioning control point apparatuses during point position determination, and positioning and mounting racks and nut columns by means of the determined reference positioning points and the determined mounting and positioning control points. The method involves highly technical content, a simple operation and safety, is time-saving and labor-saving, and can achieve high-precision positioning for on-site mounting, thereby ensuring that the device mounting accuracy meets the high standards and requirements, improving the engineering quality, and ensuring the safe operation quality of vertical liftships.

IPC Classes  ?

• E02C 5/00 - Mechanisms for lifting ships vertically

Abstract

A hydrogel includes a polysaccharide including aldehyde groups and carboxy groups, a functionalized chitosan, and iron (III) ions. The hydrogel further includes particles including a core including a carboxy-functionalized polythiophene and a shell including polydopamine. A wound dressing includes the hydrogel and a base layer selected from the group consisting of a gauze, lint, plaster, bandage and cotton wool. The hydrogel is attached or adhered to the base layer.

IPC Classes  ?

• A61L 26/00 - Chemical aspects of, or use of materials for, liquid bandages
• A61K 41/00 - Medicinal preparations obtained by treating materials with wave energy or particle radiation
• A61L 15/40 - Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing ingredients of undetermined constitution or reaction products thereof

Abstract

A method for preparing a thin-walled composite pipe is provided, in which an AlN particle/zinc-aluminum 27 (AlNp/ZA27) composite billet is subjected to multi-pass reciprocating extrusion at 250-350° C., and then loaded into a pipe extrusion die. The composite billet is heated with the temperature being in an ascending gradient distribution (within a range of 250-350° C.) along an extrusion direction from the billet to an outlet of the die, then kept a preset temperature for a period of time, and finally extruded at a rate of 0.1-0.5 mm/s to obtain the thin-walled composite pipe. A thin-walled composite pipe prepared by this method is also provided, including an AlN particle and a ZA27 alloy.

IPC Classes  ?

• B21C 23/08 - Making wire, rods or tubes
• B21C 29/00 - Cooling or heating extruded work or parts of the extrusion press
• C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
• H01B 12/12 - Hollow conductors

Abstract

2222 heat pump air conditioning system of the rail vehicle can be lowered, and the use safety is improved.

IPC Classes  ?

• F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
• B60H 1/00 - Heating, cooling or ventilating devices

Abstract

A method for preparing a Zn—Mg—Ca—Sr alloy, in which an as-cast Zn—Mg—Ca—Sr alloy is subjected to homogenization, and a boron nitride lubricant is sprayed on a surface of the as-cast Zn—Mg—Ca—Sr alloy and an inner cavity surface of a die. The as-cast Zn—Mg—Ca—Sr alloy is put into the die, and subjected to heating and 8-pass reciprocating extrusion to obtain the desired Zn—Mg—Ca—Sr alloy with high strength and high toughness, where the extrusion speed is stagewise controlled to realize stagewise variable-extrusion speed reciprocating extrusion. This application also provides a biodegradable medical implant material including a Zn—Mg—Ca—Sr alloy prepared by such method.

IPC Classes  ?

• C22F 1/16 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
• C22C 18/00 - Alloys based on zinc

Abstract

Disclosed is a method for improving sensitivity of vacuum testing of a vacuum switch, including the following steps: S100: smearing a water-soluble metal nanoparticle reagent evenly on a surface of a target material of a to-be-tested vacuum switch, performing standing and forming a metal nanoparticle coating on the surface of the target material; S200: bombarding, by using laser pulse, the surface of the target material where the metal nanoparticle coating is formed, so as to generate plasma on the surface of the target material; S300: obtaining a plasma image by collecting the plasma, and obtaining a plasma spectrum by performing spectroscopic analysis on the plasma image; and S400: obtaining a vacuum degree of the to-be-tested vacuum switch based on the plasma spectrum. The present disclosure can effectively improve a laser focusing degree and laser pulse stability and reduce noise interference, so as to lower testing limits and improve the sensitivity of online vacuum testing of the vacuum switch.

IPC Classes  ?

• G01N 21/71 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited

Abstract

Disclosed in the present invention are a premixing and membrane wall cooling burner having a built-in vertical water tube, and a gas fired boiler. The gas fired boiler comprises a burner, a combustion chamber, a heat exchanger, and a flue. The burner uses a combustion mode of a built-in premixer and membrane wall cooling; a central side-by-side tube bundle or an arc-side tube bundle is used as the head of the burner; the combustion chamber is two semi-cylindrical spaces defined by the burner and the heat exchanger; and the heat exchanger is a water tube bundle connected to upper and lower annular headers and expanded along 1-3 circles of circular arcs in the radial direction. The burner and the heat exchanger can be exchanged. After a premixed gas is burned in the burner, generated flue gas scours opposite heat exchange areas and is collected and discharged by the flue. According to the present invention, the structure is compact, the resistance is low, and the heat exchange efficiency is high; the gas flow is short, mixing and distribution are uniform, deflagration is prevented, the safety is high, and the present invention is suitable for blending combustion of natural gas and low/zero carbon fuel and combustion of pure fuel; the combustion temperature is low, the load is uniform, the turndown ratio is large, and the NOx emission is low; and the burner and the heat exchanger are communicated with the headers by using integrally or partially detachable flanges, so that the maintainability is high.

IPC Classes  ?

• F23D 14/02 - Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
• F23D 14/46 - Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid Details
• F23D 14/58 - Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
• F23M 5/08 - Cooling thereofTube walls

Abstract

A plasma-activated gas disinfection device includes a plasma generating unit, a disinfection chamber, an air pump and a fluid control module, where the plasma generating unit works in a first working mode during a first time period, and generates a first plasma active gas in the first working mode; the plasma generating unit works in a second working mode during a second time period, and generates a second plasma active gas in the second working mode; and the first time period is before the second time period, and alternatively, the first time period is after the second time period, such that a disinfection object in the disinfection chamber is disinfected. The plasma generating unit in the present disclosure is a simple device, and only one discharge module is used for generating different plasma active gases.

IPC Classes  ?

• A61L 9/16 - Disinfection, sterilisation or deodorisation of air using physical phenomena
• H01J 37/32 - Gas-filled discharge tubes

Abstract

An internal combustion engine with an external circulation system and a working method thereof are provided. The internal combustion engine is externally connected to the external circulation system through an intake port and an exhaust port. The external circulation system is capable of operating in a circulating manner when the internal combustion engine is not running, a significant raise in intake temperature is achieved during intake heating or exhaust heating, thereby the cold start-up performance of the internal combustion engine is improved and harmful emissions during cold start-up is reduced, and a compression ignition working mode of a low compression ratio engine is facilitated to be achieved.

IPC Classes  ?

• F02D 41/00 - Electrical control of supply of combustible mixture or its constituents
• F01N 3/20 - Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operationControl specially adapted for catalytic conversion
• F02D 41/38 - Controlling fuel injection of the high pressure type
• F02D 41/40 - Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
• F02M 31/04 - Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating combustion-air or fuel-air mixture

Abstract

A method of preparing a high-aluminum boron-containing die steel for severe plastic deformation of zinc alloys at elevated temperature, in which a cast ingot is obtained by sand casting, and then subjected to homogenization, austenitization, hot-die forging and cooling to obtain a heat-treated piece. The heat-treated piece is quenched and tempered to obtain a forged piece, which is subjected to finish machining to obtain the high-aluminum boron-containing die steel. A high-aluminum boron-containing die steel prepared by such method is further provided.

IPC Classes  ?

• C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor
• C21D 1/18 - HardeningQuenching with or without subsequent tempering
• C21D 1/84 - Controlled slow cooling
• C21D 6/00 - Heat treatment of ferrous alloys
• C21D 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
• C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
• C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
• C22C 38/32 - Ferrous alloys, e.g. steel alloys containing chromium with boron

Abstract

Disclosed are a method and system for blade tip timing measurement of full-frequency-domain vibration of a rotor blade. The method includes: identifying low-frequency, medium-frequency, high-frequency, and super-high-frequency mode parameters of the rotor blade to determine the number and mounting angles of sensors; identifying low-frequency vibration parameters based on blade tip timing according to blade tip vibration displacement; identifying medium-frequency vibration parameters based on blade tip timing according to blade tip vibration velocity; and identifying high-frequency vibration parameters based on blade tip timing according to blade tip acceleration and identifying super-high-frequency vibration parameters based on blade tip timing according to blade tip jerk. The present disclosure also provides a system for implementing the method for full-frequency-domain vibration measurement based on blade tip timing. The method for blade tip timing measurement of full-frequency-domain vibration extends the range of blade vibration frequency effectively measured by the blade tip timing technology.

IPC Classes  ?

• G01H 17/00 - Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass
• F01D 21/00 - Shutting-down of machines or engines, e.g. in emergencyRegulating, controlling, or safety means not otherwise provided for

Abstract

A method for preparing a biodegradable zinc alloy semi-solid billet is provided, in which a biodegradable Zn—Mg—Bi—Ca—Sr zinc alloy ingot is subjected to homogenization annealing and three-directional compression deformation to obtain a uniformly-deformed three-directional upset billet. The three-directional upset billet is subjected to semi-solid isothermal heat treatment to obtain the semi-solid billet. A biodegradable zinc alloy semi-solid billet prepared by such method is also provided.

IPC Classes  ?

• C22F 1/16 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
• B22D 7/00 - Casting ingots
• C22C 1/02 - Making non-ferrous alloys by melting
• C22C 18/00 - Alloys based on zinc
• C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working

Abstract

The present invention discloses a multi-header pipe distributing annular printed circuit heat exchanger, and pertains to the technical field of heat exchangers, the heat exchanger includes: a front head configured to achieve same side entry and exit of a cold fluid; a core body with one end thereof connected with the front head and configured to achieve distributing of cold fluid entry and exit; a hot fluid inlet cavity provided in a middle portion of the core body and configured to achieve entry of a hot fluid; a shell sheathed outside the core body, and the shell and the core body provided with a gap for collecting the hot fluid; and a lower cover plate connected with one end of the core body and configured to block the hot fluid inlet cavity. The present invention can improve compactness and power density of the heat exchanger, reduce volume and weight.

IPC Classes  ?

• F28F 9/02 - Header boxesEnd plates
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

The present disclosure provides a data processing method, a device, a computer apparatus and a storage medium, wherein the method includes: in response to a target disk receiving at least one write request within a preset time period, determining a size threshold value for classifying a data update type according to a size of write data respectively indicated by each write request; determining a data update type corresponding to each write request according to a size of each write request and the size threshold value; dividing write data of the write request to obtain a data block according to a preset data block size, and caching the data block in a cache region of the target disk corresponding to the data update type, the target disk has multiple types of cache regions configured therein, different cache regions are configured to support caching of data with different update frequencies.

IPC Classes  ?

• G06F 12/08 - Addressing or allocationRelocation in hierarchically structured memory systems, e.g. virtual memory systems
• G06F 12/0802 - Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches

Abstract

Disclosed are a method for designing lightning shielding by using diverter strips on an aircraft, a system, a device, and a medium. The method comprises: determining boundary conditions of a simulation space; according to the boundary conditions of the simulation space, performing numerical calculation on an electric field in the simulation space; according to the calculation result of the electric field and in combination with fractal theory, determining a probability of the direction of lightning leader development, and, according to the probability of the direction of lightning leader development, randomly selecting a subsequent development position of a lightning downward-moving stepped leader; determining, on the basis of testing and simulation results of a corona discharge characteristic at the tip of a metal electrode having a small radius of curvature, whether an initial corona at an end portion of a diverter strip has been initiated, and determining whether an initial corona at an end portion of a diverter strip has been initiated; determining whether the lightning downward-moving stepped leader can, after attaching to an insulating plate, run through a gap along the surface and reach an adjacent diverter strip; repeating the process above, and performing multiple simulations to solve the probability of lightning protection of diverter strips and establish a relationship between the probability of lightning protection of diverter strips and the distance between the diverter strips at different thicknesses of and using different materials for the insulating plate.

IPC Classes  ?

• G06F 16/48 - Retrieval characterised by using metadata, e.g. metadata not derived from the content or metadata generated manually

Abstract

The disclosure discloses a magnetic bias active suppression method and system of a hybrid distribution transformer, whether the HDT is closed or not is judged based on the grid-side current, and accordingly smooth switching of the two sets of control strategies is achieved; excitation currents of an HDT main transformer and an isolation transformer are calculated based on a magnetic potential balance principle, and nonlinear feedback is performed, and the excitation currents are superposed after an original control instruction of an HDT converter, so that magnetic bias suppression is realized on the basis of ensuring an HDT grid-side current and load voltage control function. According to the system, a complex and expensive iron core magnetic flux sensor does not need to be additionally arranged, and the DC magnetic bias of the HDT under any working condition can be eliminated while the basic control function of the HDT is not affected.

IPC Classes  ?

• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks
• H02J 13/00 - Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the networkCircuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network

Abstract

The present invention discloses a two-phase numerical simulation method for a microchannel heat exchanger, and the method includes: simplifying a real heat exchange channel into a porous medium model. Governing equations are determined according to two-phase flow and heat transfer characteristics thereof, and the equations are solved iteratively until results converge to complete numerical simulation. The present invention is beneficial to promoting optimization design of two-phase flow microchannel heat exchangers.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G06F 113/08 - Fluids

Abstract

A composite manufacturing method based on powder bed and five-axis additive and subtractive materials includes model Preprocessing: processing model adaptive compensation based on a design model and repairing the model after model compensation to obtain an additive model; decomposition and reconstruction: decomposing the additive model to obtain multiple sub-models that can plan the internal surface tool path at one time, and then processing additive manufacturing and CNC machining alternately for the sub-models according to the build sequence until composite manufacturing of all sub-models is completed; and post-processing: removing support structure and milling outer surface of the part after composite manufacturing of all sub-models is completed, in addition, after the influence of the powder bed and support is removed, reprocessing a non-machined part of internal structure to obtain a final required part. The present invention can realize the manufacturing of parts with complex internal structures that are difficult to process by traditional CNC machining and provides technical support for the integrated precision manufacturing of complex internal structure parts.

IPC Classes  ?

• B29C 64/393 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
• B33Y 50/02 - Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
• G06F 30/20 - Design optimisation, verification or simulation
• G06F 113/10 - Additive manufacturing, e.g. 3D printing

Abstract

The present disclosure provides a protective method and system combining process monitoring and control in laser drilling. This method includes collecting signal evolution information, a current hole depth, and motion track information in a laser drilling process; performing a feature extraction on the signal to obtain sequential eigenvalues evolving over time, and constructing a prediction model of the penetration time based on the eigenvalues; combining the hole depth and motion track information with the eigenvalues to construct a drilling stage identification model; combining a prediction result of the prediction model of penetration time and identification confidence of the identification model at different moments to construct a state identification model; and judging a current drilling stage according to the model, controlling the processing process according to a judgment result, and using different drilling strategies at different drilling stages. High-efficiency, high-accuracy, and wall-damage-free processing can be ensured.

IPC Classes  ?

• B23K 26/382 - Removing material by boring or cutting by boring
• B23K 26/046 - Automatically focusing the laser beam

Abstract

A high-precision analysis method for key thermal safety phenomena in a nuclear reactor based on a particle method is provided. Fine complex geometric modeling is implemented based on a multi-resolution particle method. High-order discretization of control equations is implemented using a high-order particle discretization model. Key thermal-hydraulic, mechanical deformation, chemical reaction, and neutron physics phenomena can be analyzed. An implicit and explicit hybrid solving technique and an asynchronous marching algorithm are employed. The method of the present disclosure integrates the multi-resolution particle method, high-order discretization model, advanced solving and marching techniques, and comprehensive physical-mathematical model to achieve a comprehensive, fine, and efficient analysis of key thermal safety phenomena in a nuclear reactor, avoiding mesh distortion in the mesh approach, and significantly improving the precision, stability, calculation efficiency, and robustness of the particle method.

IPC Classes  ?

• G21D 3/04 - Safety arrangements
• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
• G06F 30/25 - Design optimisation, verification or simulation using particle-based methods
• G06F 111/10 - Numerical modelling
• G06F 119/08 - Thermal analysis or thermal optimisation
• G21C 15/18 - Emergency cooling arrangementsRemoving shut-down heat

Abstract

232323233333233 co-doping modification, such that the crystallization properties thereof are significantly improved, the ceramic quality is improved, and the prepared piezoelectric ceramic material has good multifunctionality, shows a saturated ferroelectric hysteresis loop, and has significant dielectric and piezoelectric responsiveness.

IPC Classes  ?

• C04B 35/26 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on ferrites
• C04B 35/622 - Forming processesProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products
• C04B 35/64 - Burning or sintering processes

Abstract

The present invention relates to the technical field of electric vehicle energy integrated management. Disclosed are an electrothermal collaborative control method and system for an electric vehicle, and an energy router. The method comprises the following steps: acquiring operating state parameters of an electrical system device and a thermal system device of an electric vehicle; and according to the acquired operating state parameters, using a leader-follower Stackelberg game strategy to obtain operating parameters at the next moment of the electrical system device and the thermal system device, so as to realize electrothermal collaborative control of the electric vehicle. According to the technical solution provided by the present invention, a game theory is used to optimize energy management, so that electrothermal collaborative energy management can be carried out on the electric vehicle; the electrothermal collaborative management takes into account overall optimization and local optimization of vehicle energy configuration, thereby improving the vehicle performance.

IPC Classes  ?

• B60W 10/00 - Conjoint control of vehicle sub-units of different type or different function

Abstract

A gingival crevicular fluid collecting brush and a manufacturing method therefor. The gingival crevicular fluid collecting brush comprises a handheld part (1) and a collecting part (2). The collecting part (2) comprises a plurality of bristles made of soft bristle fibers; the collecting part (2) is connected to the handheld part (1); the width and the thickness of the collecting part (2) are gradually reduced from one end to the other end; and the small end of the collecting part (2) is distant from the handheld part, wherein the width and the thickness are both the length perpendicular to the direction of extension of the collecting part (2), and the width is greater than the thickness. The gingival crevicular fluid collecting brush has the advantages such as simple and convenient operation, low costs, rapid collection, and a high biomolecule recovery rate.

IPC Classes  ?

• A61B 10/00 - Instruments for taking body samples for diagnostic purposesOther methods or instruments for diagnosis, e.g. for vaccination diagnosis, sex determination or ovulation-period determinationThroat striking implements

Abstract

A porous barium titanate micron sheet and a preparation method therefor. The preparation method comprises the following steps: step 1, preparing a precursor A micron sheet by using a molten salt method; step 2, magnetically stirring the precursor A and a mixture B until uniformly mixed, and then preparing a precursor C micron sheet by using a molten salt method; step 3, magnetically stirring the precursor C and a mixture D until uniformly mixed, and obtaining a mixture E by using a local chemical microcrystalline conversion method; step 4, soaking and cleaning the mixture E with deionized water, pouring out the supernate after sufficient precipitation, adding nitric acid thereto, stirring the solution while performing ultrasonic dispersion, and then leaving same to stand and soaking same; step 5, pouring the precipitate in step 4 into a nitric acid solution, stirring the solution while performing ultrasonic dispersion, and then leaving same to stand; and step 6, cleaning the precipitate in step 5 several times to obtain a mixture F, and then drying the mixture F to obtain a porous barium titanate micron sheet. The porous barium titanate micron sheet has the advantages of involving simple equipment and being low cost.

IPC Classes  ?

• C01G 23/00 - Compounds of titanium
• C04B 35/468 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
• C04B 35/00 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products

Abstract

The present disclosure discloses a two-point sampling optimized method and system for sinusoidal excitation-based frequency response measurement. A plurality of points are sampled at equal intervals within the starting frequency and ending frequency range as initial information, the interpolation error of each sub-frequency band is estimated according to existing sampling information, the sub-frequency band with the largest interpolation error is selected, two new sampling points are added within the sub-frequency band, and the above steps are repeated until the quantity of sampling points reaches the total quantity set by a user; and the user is asked whether new sampling points need to be added, if so, after the user specifies a new quantity of sampling points, the interpolation error of each sub-frequency band is estimated again and sampling continues, otherwise, the sampling ends. The present improves the practicality of a sinusoidal excitation-based frequency response measurement method.

IPC Classes  ?

• H04L 7/00 - Arrangements for synchronising receiver with transmitter
• H04L 7/033 - Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal- generating means, e.g. using a phase-locked loop

Abstract

The present invention provides a combined protection method and system for monitoring, regulation and control of a laser hole drilling process, the method comprising the following steps: collecting signal evolution information, and current hole depth and motion track information during a laser hole drilling machining process; performing feature extraction on the acquired signal evolution information so as to obtain time sequence feature values evolving along with time, and, according to the obtained time sequence feature values, constructing a penetration time prediction model; combining the obtained current hole depth and motion track information with the time sequence feature values, so as to construct a hole drilling stage identification model; combining prediction results of the penetration time prediction model, and confidence coefficients of identification results of the hole drilling stage identification model at different moments, so as to construct a state identification model; and identifying a current hole drilling machining stage according to the obtained state identification model, and controlling the laser machining process according to identification results, so as to use different hole drilling strategies in different hole drilling stages. The present invention can ensure high-efficiency, high-precision and wall-damage-free machining of laser hole drilling processes.

IPC Classes  ?

• B23K 26/382 - Removing material by boring or cutting by boring

Abstract

Disclosed are a multi-dimensional laser scanning machining apparatus and method. The apparatus comprises: a horizontally-arranged laser beam; a turning optical path module arranged at an extreme end of the laser beam in a horizontal direction, the turning optical path module being used for causing a laser beam to be deflected by 90° and then enter an offset module, the offset module being used for causing the laser beam to again be deflected by 90° and horizontally enter a beam expanding module, the beam expanding module being used for expanding the beam radius of the laser beam to a certain multiple, and for causing same to enter a plane scanning module, before finally entering a focusing module to be converged into an ideal light spot. The present invention changes a focused laser beam within an XYZ space and at two incline angles α and β relative an optical axis.

IPC Classes  ?

• B23K 26/00 - Working by laser beam, e.g. welding, cutting or boring
• B23K 26/70 - Auxiliary operations or equipment

Abstract

The present disclosure discloses a single-point sampling optimized method and system for frequency response measurement. The frequency response measurement based on sinusoidal excitation is regarded as frequency domain sampling of system under test, the interpolation error between piecewise linear interpolation model of existing sampling value and the theoretical model of the system under test is estimated, and a single newly added sampling point is placed in the sub-frequency band with maximum interpolation error, so as to achieve steepest descent of an overall interpolation error. The present disclosure does not rely on specific hardware, is directly embedded into existing frequency response analyzer, has high usability, high precision and high stability, and has good data inheritance.

IPC Classes  ?

• G01R 23/18 - Spectrum analysisFourier analysis with provision for recording frequency spectrum

Abstract

The present disclosure relates to the field of strain sensors, and specifically relates to a high-temperature thin-film strain sensor, including a substrate and a strain-sensitive grid. The strain-sensitive grid includes an indium tin oxide layer and a platinum layer, the indium tin oxide layer is deposited on the substrate, and the platinum layer is deposited on the indium tin oxide layer. The indium tin oxide layer contains 50% by mass of indium oxide and 50% by mass of tin oxide. The high-temperature thin-film strain sensor provided by the present disclosure can be used in an environment from room temperature to 500° C., and have extremely high sensitivity at a high temperature of 500° C. Unlike the conventional metal foil strain gauge with a thickness of several microns, the high-temperature thin-film strain grid has a thickness of 500 nm, which can better convey the strain of the measured object at high temperature.

IPC Classes  ?

• G01L 1/22 - Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluidsMeasuring force or stress, in general by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges

Abstract

A miniature radar array mapping system in complex narrow space includes a miniature radar mapping array, a miniature radar data acquisition module, a host computer and a robot platform. A software system of the host computer includes navigation software and mapping software. The environmental sample data sampled by the miniature radar data acquisition module are transmitted to the navigation software of the host computer. Position, velocity and attitude information of a robot at a current moment are obtained by the navigation software and are transmitted to the mapping software. A 360° 3D mapping model of environment is constructed by the mapping software based on a miniature radar detection model and a miniature radar array model, which is a component unit for generating panoramic 3D maps of the complex narrow space.

IPC Classes  ?

• G01S 13/89 - Radar or analogous systems, specially adapted for specific applications for mapping or imaging
• G05D 1/242 - Means based on the reflection of waves generated by the vehicle

Abstract

Provided is a mixing, reaction, filtration and heat recovery integrated device for two-stage co-liquefaction, for use in realizing a two-stage hydrothermal liquefaction process. Moreover, the inlets of different materials and media are each provided with a nozzle (28), a receiving chamber (27), a mixing chamber (26) and a diffusion chamber (31), and a high-speed fluid is sufficiently impacted and mixed in these structures. Heat during first-stage hydrothermal liquefaction comes from heat of a second-stage hydrothermal liquefaction product, and the generation of a first-stage hydrothermal liquefaction reaction and the recycling of the heat of the second-stage hydrothermal liquefaction product are realized at the same time, so that the economic efficiency is improved. In the first-stage hydrothermal liquefaction process, by providing high-temperature high-pressure needle valves (23), accurate control of different reaction durations is achieved, so that different first-stage hydrothermal liquefaction reaction durations are selected for different material characteristics. First-stage hydrothermal liquefaction reaction pipes (20) are respectively inclined by 1-3 degrees, and a slag scraping device (11) and a salt scraping device (15) are arranged in a second-stage hydrothermal liquefaction generation chamber (10), so that stable operation of a reactor is guaranteed.

IPC Classes  ?

• C10G 1/06 - Production of liquid hydrocarbon mixtures from oil shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by destructive hydrogenation
• C10G 1/02 - Production of liquid hydrocarbon mixtures from oil shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by distillation
• C10G 1/00 - Production of liquid hydrocarbon mixtures from oil shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
• B01J 6/00 - CalciningFusing
• C10B 53/02 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
• C10B 53/00 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
• C10B 49/02 - Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge

Abstract

Disclosed in the present invention are a series flexible switching converter supporting fully autonomous control of microgrids, and a control method. Two ends of the series flexible switching converter supporting fully autonomous control of microgrids are connected to a first grid and a second grid. The control method can implement pre-charging self-starting of a device without depending on energy storage and additional control circuits, can implement asynchronous networking without directly performing real-time control on each distributed power supply in a grid, can perform, by soft switching, direct networking by means of a bypass switch after pre-synchronization to reduce loss, and can transmit, when a grid needs an emergent power support, active power to said grid by means of a device. The implementation of the described functions needs control on the series flexible switching converter rather than each distributed power supply in a microgrid, thereby supporting a microgrid to implement fully autonomous control; in addition, the device cost and operation loss are significantly reduced relative to a flexible switching converter based on a back-to-back converter.

IPC Classes  ?

• H02J 3/06 - Controlling transfer of power between connected networksControlling sharing of load between connected networks

Abstract

The present invention relates to the field of heat exchange technology, specifically to a composite process and system for producing a profiled microchannel plate heat exchanger. This process integrates selective laser melting additive manufacturing with micro electrical discharge machining to create microchannel plate heat exchangers featuring large aspect ratio flow channels and closed profile section flow channels. It enables the fabrication of channels with various cross-sections, such as circular and rectangular, as well as hollow closed profile section flow channels, including micro circular and square holes. The process allows for high-precision machining of microchannels with any aspect ratio. Heat exchangers produced using this composite process can endure extreme high temperatures and pressures, offering superior environmental benefits and contamination-free performance compared to conventional microchannel heat exchangers.

IPC Classes  ?

• B23P 15/26 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers
• B23H 7/00 - Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
• B23K 26/342 - Build-up welding

Abstract

The present disclosure provides a two-stage co-liquefaction mixing-reaction-filtration-heat recovery integrated apparatus, realizing the implementation of a two-stage HTL process; secondly, a nozzle, a receiving chamber, a mixing chamber and a diffusion chamber are disposed at different material feed ports and medium feed ports, and high-speed fluids are fully collided and mixed in these structures; heat of HTL in a first stage is from heat of an HTL product in a second stage, which achieves the recycling of the heat of the HTL product in the second stage, improving economic efficiency; in a first-stage HTL process, through the setting of high-temperature and high-pressure needle valves, so that different first-stage HTL reaction times are selected for different material characteristics; and each first-stage HTL reaction tube is provided with an inclination of 1-3°, and a second-stage HTL generation chamber is provided with a residue scraping device and a salt scraping device.

IPC Classes  ?

• C02F 11/18 - Treatment of sludgeDevices therefor by thermal conditioning

Abstract

A multi-spectrum fusion decision fault diagnosis method for a high-speed electric multiple-unit bearing, including the steps of collecting, by an acceleration sensor vibration acceleration signals of a high-speed electric multiple-unit; performing multi-method spectrum analysis on vibration acceleration signal data of a plurality of faults under a constant working condition, and marking the data to construct a spectrum data set; extracting inherent fault features of the spectrum data set to form a fault feature data set; performing weight fusion on spectrum fault features of different methods to construct a spectrum fault feature function, and fusing each set of spectra in the spectrum data set into a data point; using a criterion that a fisher discrimination ratio minimizes an intra-class spacing and maximizes an inter-class spacing to seek an optimal weight combination under the data set, so that fusion data points distinguish the different types of faults to a maximum degree.

IPC Classes  ?

• G01M 13/045 - Acoustic or vibration analysis
• G01M 17/08 - Railway vehicles
• G01M 99/00 - Subject matter not provided for in other groups of this subclass
• G06F 17/14 - Fourier, Walsh or analogous domain transformations

Abstract

A multi-focus histotripsy method based on a pulsed ultrasound phased array with hundred elements is provided. Excitation amplitude and phase of individual elements are regulated to control a phased array to produce multiple focus modes. A two-stage histotripsy is performed based on these focus modes. In a first stage, a first pulsed ultrasound is applied to an experimental sample in a target area to induce generation of cavitation microbubbles and boiling bubbles to preliminarily homogenize the experimental sample to form a loose product; and in a second stage, the experimental sample is mechanically disrupted and homogenized using a second pulsed ultrasound. The first pulsed ultrasound and the second pulsed ultrasound each are a hundred micro-second pulse or a milli-second pulse. Duty cycles of the first pulsed ultrasound and the second pulsed ultrasound are 3-10% and less than 2%, respectively. A multi-focus histotripsy system is further provided.

IPC Classes  ?

• A61N 7/00 - Ultrasound therapy

Abstract

The present application discloses a high-pressure diaphragm compressor. The high-pressure diaphragm compressor includes a gas-side diaphragm head and an oil-side diaphragm head; a diaphragm and an oil distribution disc are disposed between the gas-side diaphragm head and the oil-side diaphragm head, the diaphragm and the oil distribution disc are clamped between the gas-side diaphragm head and the oil-side diaphragm head, and a gas-side diaphragm cavity and an oil-side diaphragm cavity are respectively formed between the diaphragm and the gas-side diaphragm head as well as between the diaphragm and the oil distribution disc; an oil cylinder hole is provided in the oil-side diaphragm head, a piston is arranged in the oil cylinder hole, and a piston rod is disposed below the piston; and the upper end of the piston rod abuts onto the lower end of the piston, the piston may be separated from the piston rod.

IPC Classes  ?

• F04B 45/053 - Pumps having fluid drive

Abstract

22 thermal management system, and a system and a control method. The direct-cooled cold plate comprises a plate, a cold plate inlet and a cold plate outlet, and a heat exchange channel, a first refrigerant channel, a second refrigerant channel and a valve assembly which are arranged in the plate, wherein the first refrigerant channel is provided with a first port and a second port, the second refrigerant channel is provided with a first port and a second port, and the heat exchange channel is provided with a first port and a second port; the cold plate inlet is connected to the first refrigerant channel, and the cold plate outlet is connected to the first port of the second refrigerant channel; and the switching of a refrigerant between two flow modes, i.e., forward flow and reverse flow, can be implemented by controlling the valve assembly. The present invention can solve the problems of temperature unevenness and thermal runaway in the cold plate due to refrigerant evaporation which leads to a high dryness downstream and causes a rise in local temperature.

IPC Classes  ?

• H01M 10/613 - Cooling or keeping cold

Abstract

A high-frequency chain-type micro inverter, and a signal modulation method and apparatus for a high-frequency chain-type micro inverter. The method is applied to the high-frequency chain type micro inverter and comprises: according to a carrier signal and a modulation signal, forming an intermediate signal (S101); obtaining a reference signal according to the carrier signal (S102); and according to the carrier signal, the reference signal, and the intermediate signal, forming a driving signal, the driving signal being used for driving a primary side full-bridge circuit (10) and a secondary side conversion circuit (30), so that the high-frequency chain type micro inverter outputs at least a two-phase alternating-current voltage (S103).

IPC Classes  ?

• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 7/48 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
• H02M 1/00 - Details of apparatus for conversion

Abstract

A system for measuring a high-power semiconductor module chip-level current, and a method. A Rogowski coil is designed on a multi-layer PCB to form a multi-layer PCB planar Rogowski coil (1), a magnetoresistive chip (3) is soldered on a magnetoresistive chip PCB (4), and the magnetoresistive chip (3) maintains perpendicular to a Rogowski coil PCB plane, thereby forming a hybrid sensor (13). Real-time measurement of a high-power semiconductor module chip-level current is implemented by using the hybrid sensor (13) composed of the magnetoresistive chip (3) and the Rogowski coil. During measurement, a high-frequency signal and noise in a measurement result of the magnetoresistive chip (3) are filtered out, and the measurement result of the magnetoresistive chip (3) is decoupled to eliminate the influence on the measurement of a certain specific magnetoresistive chip (3) from the currents that flow through the remaining semiconductor chips (8), thereby obtaining a decoupled magnetoresistance measurement result. The processing process is simple, the processing result is accurate, and the technical problem of existing sensors being capable of measuring only an alternating current during measurement of a high-power semiconductor module chip-level current is solved.

IPC Classes  ?

• G01R 31/26 - Testing of individual semiconductor devices
• G01R 15/18 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
• G01R 15/20 - Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices
• G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof

Abstract

The present invention belongs to the field of heat exchanger design and analysis, and discloses a multiscale analysis method, system, media and device for thermal-mechanical coupling performance of a heat exchanger, and the method comprises: performing zone division on the heat exchanger, and establishing channel unit cell models for respective zones; calculating equivalent mechanical parameters by constructing equations for equivalent stiffness coefficients and flexibility coefficients with respect to deformation energy, setting nodal displacement constraints or performing unit strain and stress loading; constructing an equivalent model, and calculating a macroscopic stress field, a strain field and a displacement field of the whole heat exchanger under temperature and pressure loads under operating conditions, calculating microscopic stress field of mesoscale channels at locations of weak strength zones of the heat exchanger. The present invention can provide theoretical and methodological guidance for strength design and application of high-temperature and high-pressure heat exchangers.

IPC Classes  ?

• G06F 30/23 - Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
• G06F 30/17 - Mechanical parametric or variational design
• G06F 111/10 - Numerical modelling

Abstract

A method for evaluating melt fragmentation in a sodium-cooled fast reactor (SFR), in which a high-order accurate particle method is adopted to discretely solve a corresponding model and calculate the melt fragmentation process in the SFR. A least-squares moving particle semi-implicit method with high-order accuracy for gradient and Laplace models is used, and a particle-shifting technique is used to maintain a more uniform particle distribution. A geometry-based free surface identification technique is adopted. An equation-of-state model is introduced to enable acquisition of more realistic physical parameters. The solid-liquid coupling model and the phase transition model are combined to carry out the high-order accurate discretization. An evaluation system is also provided. The melt fragmentation data can be updated to the system in real time, and a real-time dynamic graph of the melt fragmentation process is automatically generated, and real-time dynamic cloud graphs of different influencing factors are automatically generated.

IPC Classes  ?

• G16C 20/10 - Analysis or design of chemical reactions, syntheses or processes

Abstract

A high-flow current capacity contact and a vacuum interrupter applied therefor are provided, wherein the high-flow current capacity contact includes: a static contact combination and a dynamic contact combination. The static contact combination includes a static conducting rod, a static excitation contact base welded on an end of the static conducting rod, a static stainless-steel supporter and a static contact blade with grooves opened. The dynamic contact combination includes: a dynamic conducting rod, a dynamic excitation contact base welded on an end of the dynamic conducting rod, a dynamic stainless-steel supporter and a dynamic contact blade. The static excitation contact base matches with the static stainless-steel supporter. Grooves opening direction of the static contact blade with the grooves and the dynamic contact blade with the grooves are matched, and the grooves opening direction thereof are aligned.

IPC Classes  ?

• H01H 33/664 - ContactsArc-extinguishing means, e.g. arcing rings
• H01H 33/66 - Vacuum switches

Abstract

A breast imaging system and method based on an area array source (2), and a device and a storage medium. The breast imaging system comprises: a power source module (1), an area array source (2), a detection module (3), a data collection module (4), and an image reconstruction module (5), wherein the detection module (3) comprises a detection platform (31), a detector (32) and a connecting arm (33); the area array source (2) and the detection platform (31) are located at two sides of an imaged object (6), and the area array source (2) is a flat-panel area array source or an arc-shaped area array source; when the flat-panel area array source is used, the flat-panel area array source comprises at least two planar ray source units (21); and when the arc-shaped area array source is used, only one area array source (2) is required, and the area array source (2) half-surrounds the imaged object (6). The breast imaging system based on an area array source (2) can implement virtual rotational projection of the imaged object (6) without a movement component, and can obtain more longitudinal projection information, thereby improving the longitudinal resolution of a reconstructed image.

IPC Classes  ?

• A61B 6/00 - Apparatus or devices for radiation diagnosisApparatus or devices for radiation diagnosis combined with radiation therapy equipment

Abstract

A system with improved reliability for preparing a liquid fuel by sludge liquefaction coupled with upgradation, comprising a hydrothermal liquefaction reaction and separation unit, a hydrogenation upgrading and re-separation unit and a flushing unit. The hydrothermal liquefaction reaction and separation unit is used for performing a hydrothermal liquefaction reaction on sludge and obtaining a mixed oil phase of crude biological oil and dichloromethane; the hydrogenation upgrading and re-separation unit is used for separating dichloromethane in said mixed oil phase and performing catalytic hydrogenation upgrading on the crude biological oil so as to prepare a liquid fuel; and the flushing unit is used for flushing the hydrothermal liquefaction reaction and separation unit and the hydrogenation upgrading and re-separation unit. The system ensures continuous preparation of liquid fuels from municipal sludge by means of hydrothermal liquefaction coupled with hydrogenation upgrading, and has stability and continuous reliability.

IPC Classes  ?

• C10G 1/00 - Production of liquid hydrocarbon mixtures from oil shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal

Abstract

A method of preparing biodegradable Zn—Mg—Bi zinc alloy includes: melting magnesium under an inert atmosphere to obtain a magnesium melt; adding bismuth particles to the magnesium melt followed by reaction under stirring and heat preservation treatment to obtain a Mg—Bi alloy melt; allowing the Mg—Bi alloy melt to stand in a furnace; subjecting the Mg—Bi alloy melt to refining, slagging-off, casting and demoulding to obtain Mg-50 wt. % Bi alloy ingot; melting zinc to obtain a zinc melt; adding the Mg-50 wt. % Bi alloy ingot and pure magnesium or pure bismuth followed by heating to a preset temperature, stirring and heat preservation to obtain a Zn—Mg—Bi alloy melt; allowing the Zn—Mg—Bi alloy melt to stand in a furnace followed by refining, slagging-off, casting and demoulding to obtain the biodegradable Zn—Mg—Bi zinc alloy.

IPC Classes  ?

• C22C 12/00 - Alloys based on antimony or bismuth
• C22C 1/02 - Making non-ferrous alloys by melting
• C22C 13/00 - Alloys based on tin
• C22C 18/00 - Alloys based on zinc

Abstract

A hybrid distribution transformer (HDT) magnetic bias active suppression method and system are disclosed. Two HDT control strategies are designed according to the magnetic bias suppression mechanisms applicable respectively before and after switching on with no load. Grid-side current is used to determine whether the HDT is switched on, and smooth switching between the two control strategies may be achieved as needed. Excitation current of the main transformer and the isolation transformer in the HDT is calculated on the basis of the principle of magnetic potential balance. Nonlinear feedback is carried out on the excitation current of the main transformer and the isolation transformer, and the excitation current is superposed on a baseline control instruction of an HDT converter, such that magnetic bias suppression is achieved while ensuring the HDT grid-side current and load voltage control function. The system requires neither the provision of a complex and expensive iron core magnetic flux sensor nor the use of a complex magnetic flux measurement algorithm. The system can eliminate direct-current magnetic bias of the HDT under any working conditions while maintaining the basic control function of the HDT.

IPC Classes  ?

• H02H 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• H02J 3/12 - Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
• H02J 3/24 - Arrangements for preventing or reducing oscillations of power in networks

Abstract

A method, apparatus and system for risk assessment of the insulation state of a power device, and a storage medium. The method comprises: measuring partial discharge data of a power device by using different types of sensors, and clustering discharge types; establishing a regression model of sensor response amplitudes and apparent discharge energy in a discharge development process on the basis of each discharge type; and on the basis of the regression model, calculating an accumulated value of the apparent discharge energy of partial discharge of the power device, the accumulated value being used as an index of risk assessment to assess the insulation state of the power device.

IPC Classes  ?

• G06Q 50/06 - Energy or water supply
• G06Q 10/0635 - Risk analysis of enterprise or organisation activities
• G06F 18/2411 - Classification techniques relating to the classification model, e.g. parametric or non-parametric approaches based on the proximity to a decision surface, e.g. support vector machines
• G06F 18/23 - Clustering techniques

Abstract

Disclosed are electrochemical-mechanical thinning method and apparatus for large-diameter semiconductor wafers. The large-diameter semiconductor wafers are thinned by combining anodizing modification and mechanical grinding. The apparatus includes a grinding tool system, a wafer holding device and a grinding wheel dressing device. The grinding tool system includes a base plate and a cup-shaped grinding wheel. The base plate is taken as a cathode, and the semiconductor wafer is taken as an anode. During thinning, both the cathode and the anode are immersed in an electrolyte. Under the action of an external electric field, the semiconductor wafer is subjected to surface modification and softening. At the same time, an oxide layer and intermediate state products generated by modification are removed together by using the grinding wheel, and the semiconductor wafer is thinned under the combined action of multi-energy fields of electricity, chemistry, machinery and force.

IPC Classes  ?

• H01L 21/304 - Mechanical treatment, e.g. grinding, polishing, cutting
• B24B 37/11 - Lapping tools
• H01L 21/683 - Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereofApparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components for supporting or gripping

Abstract

A customized method for strengthening the water droplet erosion (WDE) resistance on steam turbine blade surfaces having the following steps: step S1: carrying out numerical analysis about erosion characteristics on blade surfaces to predict water erosion prone areas; Step S2: designing corresponding structures against WDE, and conducting a test for WDE characteristics of structures to screen effective structures; Step S3: according to the areas detected in Step S1, selecting a suitable and effective structure from the test and determining where and how to arrange the structure on the blade surface is disclosed. The above-mentioned method can detect areas prone to blade erosion by numerical simulation, and arrange the structures screened out by test of WDE characteristics to improve the WDE resistance of blades, mitigating the WDE problem so only a small number of special structures in local areas are arranged, thereby minimizing cost and influence on steam turbine blades.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G01N 17/00 - Investigating resistance of materials to the weather, to corrosion or to light
• G06F 111/10 - Numerical modelling

Abstract

An inversion method for seismic wavelets and reflection coefficients, in which it is assumed that the seismic wavelets have compact support, and are smooth, and the reflection coefficients are relatively sparse. Corresponding optimization problems for the inversion of seismic wavelet and reflection coefficient sequence are constructed. By using alternating iteration, the joint inversion problem of the seismic wavelets and the reflection coefficients, which is based on compact smoothness and relative sparsity, is divided into a seismic wavelet inversion subproblem and a reflection coefficient inversion subproblem. The two subproblems are solved using a proximal algorithm. A system for implementing the inversion method is also provided herein.

IPC Classes  ?

• G01V 1/30 - Analysis

Abstract

The present invention belongs to the technical field of biomedical materials, and discloses a highly branched poly(β-amino ester) containing a hydrophobic alkyl chain, and a preparation method therefor and the use in mRNA delivery. The method comprises: subjecting an acrylate monomer and a small molecule amine monomer to a Michael addition reaction to prepare a highly branched poly(β-amino ester); and performing functional end capping on the highly branched poly(β-amino ester) to prepare a highly branched poly(β-amino ester) containing a hydrophobic alkyl chain, so as to realize efficient mRNA delivery in cells such as HeLa. The highly branched poly(β-amino ester) containing the hydrophobic alkyl chain is low in price, easy to design and prepare and better in transfection performance, and has a remarkable clinical application potential in the delivery of mRNA drugs.

IPC Classes  ?

• C08G 73/02 - Polyamines
• A61K 47/34 - Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyesters, polyamino acids, polysiloxanes, polyphosphazines, copolymers of polyalkylene glycol or poloxamers
• A61K 31/7088 - Compounds having three or more nucleosides or nucleotides

Abstract

The present disclosure discloses a method for detecting a natural frequency of a blade by a single blade tip timing sensor. In the method, two segments of displacement data vectors are subjected to dot product to obtain a product data vector after multiplication of corresponding serial numbers, the product data vector is subjected to low-frequency filtering, the filtered product vector is subjected to Hilbert transform to obtain an instantaneous phase, the instantaneous phase is subjected to discrete Fourier transform, an absolute value of a natural frequency difference between blades is extracted from amplitude frequency data, blades on a bladed disk are subjected to permutation and combination to obtain absolute values of the natural frequency differences between all the blades, a sum of the absolute values of the natural frequency differences between each blade and other blades is calculated.

IPC Classes  ?

• G01N 29/12 - Analysing solids by measuring frequency or resonance of acoustic waves
• G06F 17/14 - Fourier, Walsh or analogous domain transformations
• G06F 17/16 - Matrix or vector computation

Abstract

A device for preparing ultra-high purity zinc based on intelligently-controlled zone melting, including a slide platform connected with a screw through a servo control system to control movement of a heating-cooling device. A quartz tube is provided inside an induction heater to protect a melting zone. An infrared thermometer is connected to the heater, and configured to monitor temperature within the melting zone, and control power of the heater. A ring magnetic stirrer with non-contact circumferential rotation cooperates with coil to stir zinc melt. A water-cooling copper jacket is connected to two ends of the heater to cool a zinc bar, and its water inlet and outlet are connected with a water chiller. The infrared thermometer monitors temperature of the zinc bar and controls water flow of the cooling system. A lifting device is connected with a base cabinet to change inclined angle of the zinc bar.

IPC Classes  ?

• C22B 19/32 - Refining zinc

Abstract

The disclosure discloses a generator circuit breaker control method based on short-circuit fault current symmetry. The method includes: collecting, by a control device, current on an outlet side of a generator 7 real time; calculating a transferring current feeding moment based on a current symmetry method when fault current rises to a peak value after a short-circuit fault occurs; correcting the transferring current feeding moment by a correction coefficient; and then calculating a breaker switching moment, thereby realizing precise control on a generator circuit breaker. The method mainly addresses the situation that the existing control method cannot effectively cope with the complexity of the short-circuit fault current on the outlet side of the generator, and fills the blank of the effective method for short-circuit control of the generator circuit breaker.

IPC Classes  ?

• H02H 7/06 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generatorsEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for synchronous capacitors
• H02H 1/00 - Details of emergency protective circuit arrangements

Abstract

A generator circuit breaker includes a main current branch, a current-limiting transfer branch, a freewheeling branch and a fast switch. The main current branch includes a high-speed mechanical switch S1 and a high-speed mechanical switch S2 in parallel, wherein two ends of each of breaks of the high-speed mechanical switch S1 and the high-speed mechanical switch S2 are directly connected with wire outlet ends of the circuit breaker respectively. One end of the current-limiting transfer branch is connected in parallel to one end of the main current branch and the other end of the current-limiting transfer branch is connected with the other end of the main current branch via a fast switch S3, wherein the current-limiting transfer branch includes a transfer capacitor C, an inductor L, thyristor components T1 and T2, and a current-limiting resistor R.

IPC Classes  ?

• H02H 7/06 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generatorsEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for synchronous capacitors
• H02H 1/00 - Details of emergency protective circuit arrangements

Abstract

Disclosed is a counter-roller active power flexible spinning device for a large cylinder, including a rack unit, a spindle unit, an outer roller unit, and an inner roller unit. A spindle turntable of the spindle unit is used to fix a cylinder blank. A second driver drives the spindle turntable to rotate, thereby achieving the rotation of a cylinder blank. A first driver drives the spindle turntable to be axially fed along a cylinder through a spindle platform. A third driver of the outer roller unit can drive an outer roller to rotate, and a fourth driver drives an outer roller seat to be radially fed along the cylinder at the top of an outer pillar. A fifth driver of the inner roller unit can drive an inner roller to rotate, and a sixth driver drives an inner roller seat to be radially fed along an inner roller disk.

IPC Classes  ?

• B21D 22/18 - Spinning using tools guided to produce the required profile

Abstract

The present disclosure discloses a nonlinear sparsity-based instantaneous dynamic frequency fault diagnosis method for an aviation intermediate bearing. In the method, a vibration signal and a rotating speed signal of high and low voltages of the intermediate bearing are acquired, and a vibration signal fragment x under a specific working condition is intercepted according to the rotating speed signal; a nonlinear sparse time-frequency enhancement model or a nonlinear sparse enhancement algorithm model is established based on derivative window function short-time Fourier transform of the vibration signal; the nonlinear sparse time-frequency enhancement model is solved or the nonlinear sparse enhancement algorithm model is improved by using a fast iterative shrinkage threshold algorithm and combining a k sparse strategy, and finally a nonlinear sparse time-frequency representation result {circumflex over (N)}x, may be obtained through iterative optimization.

IPC Classes  ?

• G05B 23/02 - Electric testing or monitoring
• G01M 13/045 - Acoustic or vibration analysis

Abstract

Nuclear reactors produce large amounts of spent fuel during operation. In addition to recyclable materials such as uranium and plutonium, spent fuel also contains significant amounts of fission products and highly radioactive transuranic (TRU) elements. Homogenization of nuclides in traditional post-processing technology hinders efficient fuel recycling. In order to improve the efficiency of spent fuel recycling, and to reduce the inevitable “highly radioactive waste” produced in existing spent fuel recycling processes, a novel method for pre-separating nuclides in spent fuel is disclosed. Specifically, we have developed a physical method, wherein an artificially created large temperature gradient drives the migration of fission gas bubbles in spent metallic nuclear reactor fuel. The fission gas bubbles preferentially carry fission products and transuranic elements to achieve effective pre-separation of these elements from spent fuel, lowering cost and improving efficiency of spent fuel recycling.

IPC Classes  ?

• G21F 9/00 - Treating radioactively contaminated materialDecontamination arrangements therefor

Abstract

Disclosed is a lightweight two-crossbeam high-speed free forging hydraulic press. The hydraulic press includes a fixed crossbeam, a movable crossbeam, a column, and a return oil cylinder. By integrating a hydraulic cylinder with a through hole for the column to slide, an annular hydraulic cylinder is formed between the movable crossbeam and the column, and no hole is required to be specially provided on the movable crossbeam for mounting the hydraulic cylinder. Therefore, the rigidity, strength and bending resistance of the movable crossbeam serving as an upper crossbeam or a lower crossbeam can be effectively guaranteed, the crossbeam structure is simplified, and the manufacturing difficulty is reduced. Meanwhile, compared with the existing hydraulic press of a three-crossbeam structure, the two-crossbeam hydraulic press can greatly reduce the overall dimension and mass of the high-speed forging hydraulic press, reduce the overall height of the hydraulic press.

IPC Classes  ?

• B21J 9/02 - Special design or construction
• B21J 9/12 - Drives for forging presses operated by hydraulic or liquid pressure
• B30B 1/32 - Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by plungers under fluid pressure
• B30B 15/04 - FramesGuides

Abstract

A gas-fired steam boiler, including multiple heat exchange tubes, an upper steam header, a lower steam header, a casing, a burner, a condenser, a chimney, and a controller. The heat exchange tubes are vertically arranged to form an annular tube row. A space enclosed by the annular tube row is configured as a furnace. Adjacent two heat exchange tubes are combined to form a gap channel evenly distributed along a circumferential direction. A width of the gap channel is 0.1-4 mm, and a circumferential length of the gap channel is 50-300 mm. A length of the gap channel along an axial direction of the heat exchange tube is the same as a length of the heat exchange tube.

IPC Classes  ?

• F24H 8/00 - Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
• F24H 1/43 - Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
• F24H 9/00 - FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL Details

Abstract

Disclosed in the present invention are a parallel electron swarm parameter calculation method taking ion dynamics into consideration, and a related apparatus. The method comprises: measuring a discharge current waveform of a gas under a reduced field intensity, so as to obtain an actually measured current waveform; establishing an electron avalanche spatial-temporal development model, which couples the charge density of electrons with the charge densities of different types of ions; according to the electron avalanche spatial-temporal development model, using a finite volume method to calculate a discharge current waveform of the gas under the reduced field intensity, so as to obtain a calculated current waveform; and by taking the minimization of the deviation between the actually measured current waveform and the calculated current waveform as an optimization objective, using a genetic algorithm to calculate electron swarm parameters of the gas under the reduced field intensity. In the present invention, on the basis of Matlab and CUDA platforms, a genetic algorithm is used, the minimization of the deviation between an actually measured current waveform in pulsed Townsend and a simulated current waveform is taken as an optimization objective, ion dynamics are further taken into consideration on the basis of electron dynamics, and a parallel algorithm is applied to accelerate optimization to obtain electron swarm parameters of various gases, thereby conveniently, accurately and quickly providing basic data for plasma simulation.

IPC Classes  ?

• G06F 30/20 - Design optimisation, verification or simulation
• G06F 111/06 - Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]
• G06F 119/14 - Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

A multi-agent beyond-visual-range networked collaborative perception and dynamic decision-making method and device based on a point cloud, relating to the field of robotic perception and multi-agent collaboration. According to the method, by maintaining an obstacle list of agents and a global abnormal path list, and combining collaborative perception with path planning, multi-agent collaborative perception and multi-agent collaborative planning scheduling tasks can be realized. A re-planning mechanism is introduced, such that an agent system can make a dynamic decision according to perception information, thereby improving the adaptability to a dynamic complex environment. Moreover, by introducing a path following algorithm for time window path planning, the operation speed can be dynamically adjusted according to time conditions, providing control support for a collaborative path planning algorithm. By adding an improved obstacle avoidance algorithm, when an agent encounters an obstacle, a determination as to whether the agent can autonomously avoid the obstacle is made first, and re-planning is performed if the agent cannot avoid the obstacle, thereby reducing the frequency of re-planning, and improving the operation efficiency of the agent.

IPC Classes  ?

• G05D 1/02 - Control of position or course in two dimensions

Abstract

Disclosed are a gelatinous energetic material and a preparation method therefor, and a related system and device. The gelatinous energetic material can be stably packed in a water gap for a long time without a shell and is in communication with a positive electrode and a negative electrode of the gap. Other components of the energetic material do not contain any explosives in the entry of dangerous goods, a common formula thereof is a mixture containing nitromethane, an aluminum powder and a metal oxide, the friction sensitivity and the impact sensitivity thereof are zero according to a test for pyrogenic products, and the safety thereof is very high. Moreover, the components in the formula are insoluble or extremely difficult to dissolve in water, do not lose efficacy or decompose after being soaked in water for a long time, and can still be normally detonated under the action of a pulse current. The gelatinous energetic material is packed in a water gap and then can generate shock waves with fixed amplitude, impulse and energy under the driving of a pulse source with specific parameters, and the gelatinous energetic material also has good repeatability. Compared with discharging in the water gap under the conditions of original parameters, the amplitude, impulse and energy of shock waves are greatly improved, and the material has excellent engineering application prospects.

IPC Classes  ?

• C06B 33/08 - Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide with a nitrated organic compound
• E21B 43/26 - Methods for stimulating production by forming crevices or fractures
• E21B 43/263 - Methods for stimulating production by forming crevices or fractures using explosives
• F42D 1/00 - Blasting methods or apparatus, e.g. for loading or tamping

Abstract

A high-thermal conductivity composite material is AlNp/ZA27 composite material, including 2%, 4%, 6%, or 8% by volume of aluminum nitride (AlN) ceramic particles and zinc-aluminium-27 (ZA27) alloy. The ZA27 alloy includes 70.52-71.08% by weight of Zn, 25.58˜27.65% by weight of Al, 1.27˜3.45% by weight of Cu, and 0.50% or less by weight of Mg. In the preparation of the high-thermal conductivity composite material, an as-cast AlNp/ZA27 composite material is subjected to homogenizing annealing and reciprocating extrusion.

IPC Classes  ?

• C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
• B21C 23/00 - Extruding metalImpact extrusion
• C22C 1/10 - Alloys containing non-metals
• C22C 32/00 - Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ