507results about How to "Reduce experiment cost" patented technology

The invention discloses a high-pressure servo dynamic true triaxial testing machine. A main machine consists of three sets of loading/unloading systems which are independent from one another, including two sets of vertical loading/unloading systems and a set of horizontal loading/unloading system which are all high-rigidity loading/unloading frames. The testing machine is a comprehensive type rigidity testing machine which can perform multiple tests such as simple single-shaft tension, compression and shearing tests, ordinary triaxial tests and true triaxial tests, moreover the testing machine can provide pressure which is large enough to meet experiment requirements of materials such as most rock, static load and disturbance load can be independently exerted to a rock sample test piece in three directions which are perpendicular to one another in a three-dimensional space, and the load can be rapidly unloaded in a single side. In addition, all operation is accomplished by a computer keyboard and a mouse, and meanwhile a necessary manual control device is provided, so that the testing machine has the characteristics of convenience and flexibility in operation.

The invention discloses a method and device for testing rock drillability of deep well drilling and extra-deep well drilling. The device comprises a machine frame (1), a high temperature and high pressure loading mechanism and a micro drill bit rock breaking drilling depth measurement mechanism, wherein the high temperature and high pressure loading mechanism and the micro drill bit rock breaking drilling depth measurement mechanism are arranged on the machine frame (1). The device exerts confining pressure, pore pressure and fluid column pressure on rock samples in cavities in three axes, overburden pressure is exerted on the rock samples through a hydraulic pump, and therefore the high pressure environment of the stratum of the bottom of a well can be simulated, the relation between the drilling depth and the time is tested through a displacement sensor at the position of a micro drill bit, optimization of the drilling pressure, the rotating speed and the drilling fluid type and drilling machinery drilling speed prediction are achieved. The method and the device have the advantages that the requirements for the bottom hole temperature and the pressure can be met in the deep well drilling process and the ultra-deep well drilling process, the function of testing multiple sets of rock drillability values through a single time of experimental testing of deep well drilling is achieved, the efficiency of the single time of experimental testing is greatly improved, and experimental cost is reduced.

The invention relates to a preparation method of a flexible silicon dioxide fiber film. The method includes: (1) mixing tetraethyl orthosilicate, ultrapure water and phosphoric acid at room temperature to obtain a transparent and clear silicon source solution; (2) dissolving polyvinyl alcohol in the ultrapure water with stirring at the temperature of 80-90 DEG C for 4-5 hours to obtain a polyvinyl alcohol solution; (3) mixing the silicon source solution with the polyvinyl alcohol solution to obtain a colorless clear spinning solution, standing and ageing prior to electrostatic spinning, and collecting a layer of uniform white fiber film; (4) putting the white fiber film in a muffle furnace, heating to 500 DEG C prior to retaining the temperature for 2-4 hours, then heating to 800 DEG C prior to retaining the temperature for 2-3 hours, and finally naturally cooling to obtain the flexible silicon dioxide fiber film. The preparation method is simple, and the prepared silicon dioxide fiber film is resistant to organic solvents and corrosion, has good flexibility after being subjected to high temperature and has potential application in the fields of catalyst loading and fluorescent films.

The invention relates to an apparatus for a high-temperature creep test and a stress relaxation test of a rubber elastomer. A stress loading part is positioned right above a temperature control part; a clamp comprises an upper pressing plate and a lower pressing plate which correspond to each other in the vertical direction, wherein the upper pressing plate is horizontally suspended in a high-temperature test box by virtue of a connecting rod, and the lower pressing plate is movably installed in the high-temperature test box; an upper crossbeam is positioned above a lower crossbeam; two ends of the upper crossbeam are fixed on a side plate, and two ends of the lower crossbeam are fixed on the side plate by virtue of a slide apparatus which can slide up and down along the side plate and can be positioned; a straight shaft vertically penetrates through the upper crossbeam, the upper end of the straight shaft is fixedly provided with a weight disc, and the lower end of the straight shaft pushes against the upper surface of the lower crossbeam; a pressure sensor is connected with a connecting rod penetrating through the top of the high-temperature test box; a displacement sensor is fixed on the side plate; and a drive part comprises a ball screw pair consisting of a ball screw and a bearing, the bearing is installed on a base, the ball screw is engaged with the bearing, and the ball screw is detachably connected with the lower crossbeam by virtue of a fixed bracket.

The invention relates to a visual dynamic simulating device for deposition in a gas hydrate pipeline, which is used for simulating the generation, the transportation and the deposition of gas hydrate in high-pressure high-speed air flow and can be used for summarizing the high-speed motion characteristic, the transportation mechanism and the deposition rule of a pipeline gas-solid phase. The invention has the technical schemes that: the top end of a low-pressure gas storage tank is provided with a temperature sensor and a pressure sensor, the outlet end of the low-pressure gas storage tank is connected with a high-pressure gas pump and then is connected with a high-pressure gas storage tank, and the top end of the high-pressure gas storage tank is provided with a pressure sensor; the outlet end of a liquid storage tank is connected with a metering pump, and the upper end of a gas-liquid separator is connected with a vacuum pump and a tail gas treating device; the top end of a high-pressure reaction tube is connected with an outlet electrical heating insulation pipeline, and the bottom end of the high-pressure reaction tube is provided with a pressure sensor and an inlet electrical heating insulation pipeline; and a data acquisition system is formed by a data acquisition card, a computer, a cold light source and a high-speed camera, and a pipeline temperature attitude control system is additionally arranged. According to the visual dynamic simulating device disclosed by the invention, the generation process, the transportation process and the deposition process of the gas hydrate in the high-pressure high-speed air flow can be really simulated, and the visual dynamic simulating device is used for evaluating a gas hydrate inhibitor.

The invention provides a preparation method of perovskite quantum dots. The preparation method comprises steps as follows: A), Cs2CO3, oleic acid and octadecene are mixed and subjected to a heating reaction under the condition of protective atmosphere, and a cesium oleate precursor solution is obtained; B), lead halide and octadecene are mixed and subjected to heating and heat preservation under the condition of protective atmosphere, after an oleic acid and oleylamine mixed solution is added and heated to 170-190 DEG C, an obtained mixed solution is mixed and reacts with the cesium oleate precursor solution, and the perovskite quantum dots are obtained, wherein the lead halide is selected from one or more of lead chloride, lead bromide and lead iodide. According to the preparation method, the coordination effect of surface ligands of the perovskite quantum dots of different halide ions directly synthesized at a higher temperature is more remarkable, so that stability and fluorescence quantum efficiency of the synthesized perovskite quantum dots are both guaranteed.

The present invention provides a power source-free and valve-free type single molecule detection chip, which comprises a reaction layer, a modification layer, a sealing layer, a main channel, small reaction chambers, a sample inlet, a sample outlet and a heat resistant adhesive tape, wherein the reaction layer is formed by connecting the main channel and the reaction small chambers in series, the reaction small chambers are positioned above or below the main channel, the sample inlet and the sample outlet are positioned on both ends of the main channel, the modification layer is pre-connected with the sealing layer, the reaction layer is sealed with the sealing layer through the modification layer to form a microfluidic chip assembly, and the heat resistant adhesive tape is adhered on the upper surface of the reaction layer. According to the present invention, miniaturization is achieved, such that consumption of reagents and samples are reduced, and cost is low; a small amount of liquid can be assigned to hundreds of the independent small chambers without an external connection drive system and valve switching control equipment so as to reduce complexity of chip production and use; and the operation is simple, other control devices are not required, application cost is low, and the chip can be used in real-time fluorescence quantitative polymerase chain reactions and digital nucleic acid amplification.

The invention discloses a multifunctional true triaxial rock creepmeter, comprising a base, a test piece mounting base arranged on the base, two groups of horizontal direction stress loading systems with the same structure, a vertical direction stress loading system and a creep data measuring system. The multifunctional true triaxial rock creepmeter disclosed by the invention can carry out a single-axis pulling and pressing creep test and also can carry out a true triaxial compression, pulling and pressing combined creep and unloading-creep test which simulates three-dimensional stress state and loading and unloading stress path of a natural geological rock mass and an engineering rock mass and maintain tension stress states in one or two directions unloaded to the rock; and test function is more comprehensive, practicability is stronger, and a pulling and pressing combined creep and stable pressing and pulling stress conversion unloading-creep test is realized; a pull pressure loading system can provide a pressure which is high enough to meet creep test requirements of most rock materials, and a long-term constant load can be provided; and the multifunctional true triaxial rock creepmeter disclosed by the invention has the characteristics of having a simpler structure, hardly consuming energy source in a test process and having low test cost.

The invention discloses a molecular marker micro-bead and a high-throughput single cell sequencing method based on the same. The molecular marker micro-bead for high-throughput single cell sequencing comprises a micro-bead body and a link-coupled oligonucleotide chain serving as a molecular marker, the oligonucleotide chain comprises a universal primer sequence, a poly T tail, a molecular tag sequence and a cell tag sequence, wherein the universal primer sequence serves as a primer binding area in PCR (polymerase chain reaction) amplification, the poly T tail is combined with a poly A sequence of mRNA, the molecular tag sequence marks combined mRNA, and the cell tag sequence marks cells derived from the mRNA. The molecular marker sequence of the molecular marker micro-bead is divided into four functional areas including the universal primer sequence, the cell tag sequence, the molecular tag sequence and the poly T tail respectively. The high-throughput single cell sequencing method based on the molecular marker micro-bead can acquire specific transcriptome information of tens of thousands of single cells once, and a complete experiment is low in cost, short in time and high in throughput and has an excellent application value.

The invention discloses a single-shaft pulling-pressing double-function creepmeter, which comprises a working platform, a pulling-pressing force loading system and a creep data measuring system. The working platform comprises a base, a first support rod assembly, a second support rod assembly, a press bearing plate, a pulling bearing plate, a working plate and a loading plate. The pulling-pressing force loading system comprises an oil drainage oil cylinder, a large-diameter oil cylinder and a small-diameter cylinder and further comprises a pulley weight loading device. The creep data measuring system comprises a strain sensor, a data collector and a microcomputer. The single-shaft pulling-pressing double-function creepmeter can be used for conducting both compression creep experiments andpulling creep experiments. The pulling-pressing force loading system can amplify weight loading load through a pulley block, and pressure can be amplified after being transferred to the large-diameter oil cylinder from the small-diameter oil cylinder, so that the loading force can meet requirements of a large mount of rocks for creep experiments. Simultaneously, the loading load is convenient to adjust and capable of maintaining constant for a long time. The creepmeter is high in measuring accuracy, low in manufacture cost and low in experiment cost due to the fact that the creepmeter consumes no electric energy in the experiment process.

The invention provides an experimental device for a simulated blood vessel microenvironment. The device comprises a card type flow chamber, a peristaltic pump and a liquid storage tank, wherein the card type flow chamber as a core component of the device has a rectangular base and the center of the base is provided with a step which is provided with an O-shaped seal groove and a micro-reagent storage pool; a microporous membrane is covered on the storage pool; an O-shaped gasket ring is arranged on the microporous membrane; the membrane is flattened by a clamping plate with a rectangular groove and a central through hole, and is fixed on the step of the rectangular base; the base is matched with an upper cover which is provided with a T-shaped inflow port and an outflow port; and the rectangular groove of the clamping plate is closed to form a main flow field area; the clamping flow chamber, the peristaltic pump and the liquid storage tank are connected into a whole through pipelines; a lower liquid storage tank is connected with a vent hole which is provided with a filter membrane to keep constant system pressure. The device flattens and fixes the membrane by pushing of the clamping plate, and forms a micro-chemical cabin under the membrane, and the main flow field area is a flaky laminar flow, thereby providing the novel experimental device for the in-vitro simulated blood vessel microenvironment used in micro-chemical experiments with high flow field stability and low experiment cost.

The invention belongs to the technical field of light gas gun experiments, and particularly relates to a light gas gun driven through hydrogen and oxygen mixed gas detonation, in particular to a two-stage light gas gun driven through hydrogen energy. According to the technical scheme, the two-stage light gas gun driven through hydrogen energy comprises a combustor, a gas injection device, an ignition device, a pump pipe, a high-pressure cone section, a transmitting pipe, a target chamber and a magnetic speed testing device, wherein the ignition device is installed at one end of the combustor, the other end, opposite to the end with the ignition device, of the combustor is connected with the pump pipe, and a pump pipe membrane and a pump pipe membrane breaker are arranged at the junction; the gas injection device is used for injecting hydrogen, oxygen and inert gas into the combustor; a piston is arranged in the pump pipe; the large-diameter portion of the high-pressure cone section is connected with the pump pipe; the small-diameter portion of the high-pressure cone section is connected with the transmitting pipe, and a transmitting pipe membrane and a transmitting pipe membrane breaker are arranged at the junction; shots are arranged in the transmitting pipe, and one end of the transmitting pipe is located in the target chamber; and the magnetic speed testing device is installed at the tail end of the transmitting pipe and connected with an oscilloscope. The two-stage light gas gun is driven through hydrogen energy instead of gunpowder, damage to the gun is small, no particular product is generated, and a gun barrel can be cleaned conveniently after experiments.

Air-blowing or air-breathing compressor cascade experimental system relates to an experimental installation of testing compressor cascade. The present invention solves the problem of prior test equipment can not test inner flowing in air-blowing or air-breathing compressor cascade. The right and left two ends between said top plate (7) and bottom plate (8) are equipped with at least one solid blade (9) separately, three hollow blades (10) are installed between the top plate (7) and the bottom plate (8) in said solid blade (9), said upper Air-blowing/air-breathing interface (11-1) are installed on the top horizontal section of each hollow blades (10), said lower Air-blowing/air-breathing interface (11-2) are installed on the bottom horizontal section of each hollow blades (10), said probe (12) is installed between the top plate (7) and the bottom plate (8). The invention can be considered as the simplified model of carefully analysis of three-dimensional flow field structure and the aerodynamic performance in compressor cascade, it is the effective approach of the searching of compressor performance improvements.

The invention discloses a teaching scientific-research experiment platform for a hardware-in-the-loop intelligent track and belongs to the technical field of mechanical electrical integration . In the invention, a supervisory computer software module in a computer is used for analyzing and processing status information of the track and gives control instructions to the track. The computer exchanges data with a communication system through a computer communication interface. The supervisory computer software module analyzes and extracts the status information of the track after receiving the status data frames of the car, and synthesizes the control instructions to form control instruction data frames before the supervisory software module dispatches the control instruction data frames. An intelligent track system carries various sensors and motion execution units of a track model. The information acquired by the sensors is synthesized into status data frames of the track and dispatches the status data frames to the communication system. After the intelligent track system receives and analyzes the control instruction data frames from the communication system, the smart track system extracts effective control instruction information, and outputs the control signals of a motor and a control actuator to control the motor and the control acutator. The invention can be used for simulation and demonstration of scientific research experiments.

The invention discloses a capillary needle. The capillary needle comprises a tube body, the two ends of the tube body are respectively provided with an inlet and an outlet for electro-spray, a part of the tube body is bent to form a sampling end, and the sampling end is provided with a sampling port communicating with a cavity in the tube body. The invention also discloses an electro-spray ionization mass spectrometry analytical apparatus applying the capillary needle. The invention also simultaneously discloses a method applying the electro-spray ionization mass spectrometry analytical apparatus for analytical detection. The analytical apparatus is high in integration, compact in structure, easy to control, small in size and low in cost; the sample consumption is greatly reduced, and the experiment cost is decreased; an integrated sample introduction method is employed, and an sample introduction end does not have to be repeatedly placed in a sample and blank solution, such that cross contamination is reduced, and more importantly, the analytical flux is substantially improved; and through combination with an automatic sample changing system, different samples can be automatically introduced, and therefore, the capillary needle, the apparatus and the method are quite suitable for such fields as high-flux screening, unicell analysis, mass spectrum imaging analysis and the like.

The invention relates to a method for calibrating the numerical simulation results of an inner flow field in a centrifugal pump. The method comprises the following steps: performing mechanical reformation in such specific regions as a tip clearance on a centrifugal pump prototype and the exit of a pumping chamber, so as to ensure that the specific regions are transparent and visible; utilizing the PIV technology to measure the transient whole-flow-field velocity distribution in the specific regions, and obtaining such statistics characteristic parameters as the regional average velocity in the specific regions; conducting contrastive analysis on the PIV experimental results in the specific regions and the numerical simulation results, including the overall distribution characteristics of a velocity vector, the average velocity, and other statistics characteristic parameters; quantitively checking the accuracy of the numerical simulation results, and repeatedly modifying the key parameters, such as a fluid domain, a grid, an initial condition and a calculation model, in a numerical simulation process to correct the numerical simulation results, thereby achieving the aim of calibrating the numerical simulation results of the inner flow field in the centrifugal pump. The method is low in experimental cost, short in period, and higher in applicability and feasibility.

The invention provides a method for simulating and calculating interaction parameters among chemical components by using a computer. The method comprises the steps of: (1) drawing the molecular formulas of two kinds of components to be simulated by using a Visualizer module of MS (Microsoft) software; (2) performing energy minimization treatment by using Minimize in a Discover module of the MS software; (3) performing structure optimization by using a Focite module of the MS software; (4) performing molecular dynamics structure optimization by using the Discover module of the MS software, analyzing by using analysis in the Discover module to search a conformation with minimal energy; (5) performing Blends computation by using a Blends module of the MS software to obtain a table file; and (6) performing analysis and calculation on the table file by using analysis in the Blends module of the MS software to obtain the interaction parameters of the two kinds of components in different temperature ranges. The method disclosed by the invention has a wide determination range, the interaction parameters of any two kinds of components among heavy oil components can be calculated, and thus, a large amount of experiment cost and labor cost are saved.

The invention discloses a self-elevating type offshore platform wind load coefficient test experimental system. The self-elevating type offshore platform wind load coefficient test experimental system comprises an experimental platform, a monitoring platform and a control platform, wherein the experimental platform comprises a simulated wind field channel, an atmospheric boundary layer simulation device and a wind flow generation device; the simulated wind field channel comprises a ventilation pipeline and an offshore platform model arranged inside the ventilation pipeline; the atmospheric boundary layer simulation device comprises a momentum loss device, a lateral mixing device and a ground roughness element; the wind flow generation device comprises an air blower and a flow guiding screen plate; the monitoring platform comprises a wind power, wind pressure and wind velocity signal acquisition and processing unit; and the control platform comprises an air blower control unit which is used for controlling output power of a motor of the air blower so as to product wind flows at different wind velocity gradients under the condition of different power, and a data acquisition and processing unit which is used for acquiring, processing, analyzing and displaying signals from the monitoring platform in real time.

The present invention relates to a composite titanium dioxide nano-sheet photocatalyst, a preparation method and applications thereof, wherein the composite titanium dioxide nano-sheet photocatalyst comprises, by weight, 0.01-0.02% of carbon quantum dots, 39.44-70.73% of carbon nitride, and 29.25-60.55% of titanium dioxide. According to the present invention, titanium tetraisopropanolate and melamine are respectively adopted as the titanium source and the nitrogen source, and the precursor synthesis method is used to compound the titanium dioxide, the carbon nitride and the carbon quantum dots, wherein the carbon quantum dot mass content is extremely low while the high photocatalytic activity is provided, and the product can be used in organic wastewater treatment and hydrogen production through water photodecomposition.

The invention provides a high-temperature melt physical property measuring device which comprises a physical property measuring system, a heating furnace, a lifting system, a vacuum and atmosphere control system, a temperature control system and a control display system.The physical property measuring system is used for obtaining measured data, the heating furnace is used for providing the data extraction environment, the lifting system is used for controlling the relative position of the physical property measuring system and the heating furnace, the vacuum and atmosphere control system is used for ensuring that the reaction atmosphere and pressure of the physical measuring system and the heating furnace are consistent, the temperature control system is used for controlling the reaction temperature in the heating furnace, and the control display system is used for processing the measured data and calculating and displaying high-temperature melt physical properties.The device can ensure that viscosity, density, surface tension and specific conductance of a high-temperature melt are rapidly and precisely measured at good heating rate under precise temperature control.

The invention discloses an ultramicro droplets manipulator based on liquid residues. which comprises a porous plate, an ultramicro droplets array chip; a liquid collecting probe comprising a support part and a liquid collecting end at bottom of the support part; wherein the surface of the liquid collecting end has endophilicity to liquid to be collected, and the external surface of the support part has no endophilicity to liquid to be collected; and a switching mechanism; so that the sampling process of the liquid collecting probe on the liquid to be collected as well as sample placing processes that the liquid to be collected is placed in the ultramicro droplets array chip can be carried out in order. The invention also discloses a method for control the ultramicro droplets based on liquid residues. According to the invention, volume precision with lower than PL grade and even low to FL grade to AL grade can be reached, consumption of samples and reagents in chemical and biology reaction and analysis can be effectively reduced, experiment cost is saved, driving parts such as an injection pump and a peristaltic pump as well as pipelines such as capillary are not required, system operation is simple, reliability is high, array form and automation can be easily realized.

A three-level light-gas gun driven by compressed nitrogen comprises a primary gas chamber, a primary pump tube, a secondary gas chamber, a secondary pump tube, a tertiary gas chamber and a transmitting tube. The primary gas chamber is connected with the primary pump tube, and a quick opening valve is arranged between the primary gas chamber and the primary pump tube; the primary pump tube is connected with the secondary gas chamber; the secondary gas chamber is connected with the secondary pump tube, and a secondary diaphragm is arranged between the secondary gas chamber and the secondary pump tube; the secondary pump tube is connected with the tertiary gas chamber; and the tertiary gas chamber is connected with the transmitting tube, and a tertiary diaphragm is arranged between the tertiary gas chamber and the transmitting tube. A three-level driving mode is adopted, energy utilization efficiency among levels is improved, a severe gas environment in a gun body is improved, and ablation risks of the gun body are reduced; the secondary gas chamber and the tertiary gas chamber are of straight barrel type structures or barrel structures with large cone angles, and the energy utilization efficiency is improved; and a replaceable ablation ring is arranged at the front end of the transmitting tube, the ablation risks of the gun body are reduced, and experimental cost of super-speed transmission is greatly reduced.

The invention discloses a two-way four-quadrant frequency converter, and belongs to the technical field of low power wind power generation. The two-way four-quadrant frequency converter comprises a switching power supply, a driving protective circuit, a program upgrading interface circuit, a coder interface circuit, a DSP (digital signal processor) controller, a first drive circuit, a second drive circuit, a signal acquisition circuit, an alternating-current input reactor, a first circuit breaker, a grid-side frequency converter, a rapid overflowing fuse protector, a current foldback circuit, a motor-side frequency converter and an alternating-current output reactor. According to the invention, the two-way four-quadrant frequency converter avoids the situation that two controllers can not simultaneously achieve coordination control so as to cause direct current bus voltage fluctuation under the occasion of load power and power-supply voltage jump and the like, and the direct current bus voltage after control is more stable; and the two-way four-quadrant frequency converter solves the defects that the electricity is taken from a direct current bus, the integration level of the frequency converter is improved, the structure of the frequency converter is simplified, and the safe operation of the frequency converter is farthest ensured.

The invention discloses an intelligent out-of-control protection system for a rotary wing type unmanned aerial vehicle. The intelligent out-of-control protection system comprises the following equipment of a power source, an attitude sensor, a height sensor, a control chip, a first steering engine, a second steering engine, a shock absorption autoinflation air cushion, a catapult and a self-throwing type parachute, wherein the power source is used for supplying power to the control chip, the attitude sensor, the height sensor, the first steering engine, the second steering engine and the catapult; the attitude sensor and the height sensor are used for acquiring attitude data and height data of the rotary wing type unmanned aerial vehicle and sending the attitude data and the height data to the control chip; the control chip is used for analyzing the attitude data and the height data and sending out a control signal to the first steering engine and the second steering engine; the first steering engine is used for controlling the catapult to be started and stopped; the second steering engine is used for controlling an autoinflation device to inflate air into the shock absorption autoinflation air cushion; the shock absorption autoinflation air cushion is installed at the bottom of the rotary wing type unmanned aerial vehicle; the catapult is fixed to the top of the rotary wing type unmanned aerial vehicle; and the self-throwing type parachute is installed inside the catapult.

The invention relates to the technical field of biology and particularly relates to a next generation sequencing library building technology. A library is built through utilizing two rounds of multiplex PCR (Polymerase Chain Reaction). Aiming at each target region or target site, two specific primers are designed; and an upstream primer OP is used for the first round of multiplex PCR and a downstream primer IP is used for second round of multiplex PCR. After a product of the second round of PCR is purified, Q-PCR quantification is carried out; and then the product is diluted to a proper concentration and is used for next generation sequencing. According to the next generation sequencing library building technology, the problems of an Ampliseq kit can be effectively reduced, and a customization-oriented panel design production period only needs two weeks; the cost of building a library by a single sample is reduced; and the technology is general for Ion Torrent and Illumina sequencing platforms.

The invention belongs to a near-field measurement method for an antenna array of a virtual feed network. The method includes the steps of firstly, setting a near-field measurement area which accords with antenna array beam scanning ranges and meets sampling theorems, secondly, obtaining near area electromagnetic field vector data of each antenna radiating element sequentially on the same sampling position, and connecting other units not to be measured with matched load, thirdly, after measurement on all units is completed, carrying out vector superposition on measured data of all antenna radiating elements sequentially on the same sampling position according to arbitrary weighting laws, virtualizing a feed network so as to obtain near area electromagnetic field data of the antenna array under the virtual feed network, and lastly, computing electrical characteristics of a far-field area through strict near-field and far-field mathematical manipulation to analyze and estimate performance indexes of the antenna array.

The invention relates to a slit type fishway experimental device with a plurality of stages of falling sills and grooves. The device mainly comprises a water inlet system connected with a water circulation system, a water retaining system connected with the water inlet system, and a water outlet system connected with the water retaining system. A water flow flows into the water inlet system through a ground water tank of the water circulation system, flows into a water tank of the water retaining system through a water flow buffer tank in the water inlet system, flows from a tail pond in the water inlet system into an underground pond through the water tank, and flows back into the ground water tank of the water circulation system through a draft tube.The water flow of the ground water tank is controlled by an upstream manual control valve, and the water flow of the tail pond is controlled by a downstream manual control valve. The device provided by the invention adopts the water circulation system, can recycle experimental water and reduces an experimental water volume and cost; three stages of falling sills are in fit with grooves so as to relatively more equally distribute energy dissipation to each energy dissipation part, improve the energy dissipation efficiency and reduce the degree of disorder of the water flow; and in a controllable range of the water flow, the flow rate and flow regime of the water flow are relatively closer to natural conditions, so a fish putting experiment meets actual conditions.

The invention discloses a Langmuir multi-probe control circuit used for plasma diagnosis and belongs to the technical field of plasma diagnosis. The control circuit is located outside a plasma device and comprises three Langmuir single-probes, an alternating-current sawtooth wave supply voltage generation device, a direct-current supply voltage generation device, a double-pole-double-throw switch, a reversing switch, a first double-pole-three-throw switch, a second double-pole-three-throw switch, a first single-pole-single-throw switch, a second single-pole-single-throw switch and a transform resistor. Selection of the Langmuir single-probes, a double-probe, and a three-probe in different diagnosis circuits is carried out through switching-over of the switches in control circuits, and a cleaning circuit is provided for cleaning of the probes. According to the Langmuir multi-probe control circuit used for the plasma diagnosis, similarities of three probe diagnosis methods on an experimental instrument are used, experimental cost can be saved, different methods can be used by switching-over of the control circuits due to the fact that difference of the three probe diagnosis methods are combined, convenience and high efficiency are achieved, experimental period is greatly shortened, and experimental results are enabled to be accurate due to the fact that the probes can be cleaned during experiment.

The invention discloses an equivalent loading experimental device capable of realizing the shock compression of material underwater explosion shock waves. The equivalent loading experimental device mainly comprises an emission system, a speed measuring system, a water tank system, a hydraulic system and a measurement system; the emission system and the water tank system are arranged horizontally and linearly; the port of the emission pipe of the emission system is opposite to the port of the head of a high-pressure water tank; the speed measuring system is installed at the port of the emission pipe; and the main body part of the water tank system includes two water tanks and a transmission rod. A bullet is utilized to impact the water tank system; and the kinetic energy of the bullet can be converted into the energy of shock waves in the water tank. According to the equivalent loading experimental device of the invention, explosion shock waves under underwater environments of different depths can be obtained under a condition that no explosives are used; and dynamic shock compression mechanical behavior analysis of a plurality of materials under underwater explosion shock waves can be completed. The equivalent loading experimental device has advantages of high repeatability, high safety, low experimental cost, simple operation and so on.

The invention discloses a flexible array-based brain-computer interface electrode cap, which comprises a flexible electrode cap body. The electrode cap body is internally provided with a plurality of input terminals, and the input terminals are provided with a flexible array electrode. The invention has the advantages that the flexible array-based brain-computer interface electrode cap can be worn comfortably, can be used rapidly and conveniently, and has a high signal-noise ratio, high universality and good stability.