2736results about How to "Reduce experiment cost" patented technology

The invention provides an integrated flow path chip device used for digital nucleic acid amplification. The device is composed of a vacuum system, a pipeline, a sucker, a sealing cover layer and a reaction layer, wherein two ends of the sealing cover layer are respectively provided with a sample inlet and a sample outlet; a path is formed between the sealing cover layer and the reaction layer; the reaction layer is provided with small reaction chambers; the sucker is arranged on the sample outlet; the vacuum system is connected with the sucker via a pipeline; and the sample inlet and the sample outlet are sealed by adhesive tape paper. According to the integrated flow path chip device, trace reaction samples can be distributed to thousands of small reaction chambers, and mineral oil is led in via a path in the sealing cover layer to separate thousands of small reaction chambers so as to realize the single molecule amplification and precisely quantify the nucleic acid molecules. The device is reasonable to design and is a minitype device used for digital nucleic acid amplification, which has low cost and is easy to operate.

The invention provides a monitoring method for the turning stability of a digital control machine tool, relating to the monitoring technical field. As the performance of a servo system is continuously improved, a response speed, the sensibility and the like of the servo system are also continuously improved, thus, states of the machine tool can be reflected on a current of a driving motor during a cutting process. In the invention, through various signal processing methods, a plurality of characteristic values of current signals are extracted, a characteristic status vector is established as an input of a mathematical model, and a cutting status of the machine tool is output through analysis and calculation of the mathematical model. As the invention has the characteristics that the current signal has high anti-interference performance and is easy to be acquired, assistant tools are fewer, and the like, compared with a plurality of existing monitoring methods, the invention has the advantages of simple and feasible operation, good monitoring effects and the like; thereby, the invention can more easily realize the online monitoring for the processing states, and can effectively guarantee the processing security and the product quality.

The invention relates to the field of high-throughput screening and particularly relates to an automatic micro-droplet array screening system using method with pico-liter-scale precision. The using method provided by the invention comprises the following steps of: firstly, using liquid with a low thermal expansion coefficient and filled in a liquid driving system and a capillary tube as carrier liquid, and entirely emptying bubbles inside the capillary tube; secondly, soaking a sampling end of the capillary tube in an oil phase sample immiscible with a water phase sample, extracting a section of oil phase sample into the capillary tube, so as to isolate the water phase sample and the carrier liquid; thirdly, soaking the sampling end of the capillary tube into a sample / reagent storage tube and extracting a certain volume of the water phase sample solution into the capillary tube; and finally, moving the sampling end of the capillary tube into the oil phase sample above micro-pores of a micro-porous array chip, and pushing the sample solution in the capillary tube into the micro-pores, so as to form sample droplets. With the adoption of the using method provided by the invention, the liquid is quantitatively measured, and the generated droplets have the pico-liter-scale volume precision, so that the consumption of the samples / reagents in the high-throughput screening can be effectively reduced, and the experiment cost can be saved.

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 relates to a fatigue experiment device for a deepwater stand pipe, which is characterized by comprising a main cylinder barrel, an axial loading cylinder, a stand pipe test piece assembly, transverse servo loading cylinders and soil action servo loading cylinders, wherein the top of the main cylinder barrel is provided with an external pressure joint and an air vent valve; two ends of the main cylinder barrel are respectively connected with the axial loading cylinder with an axial force joint; two ends of the stand pipe test piece assembly are respectively hinged on a piston of the axial loading cylinder on the corresponding side; the stand pipe test piece assembly comprises a test piece body and a connecting rod, wherein simulated soil is arranged below the test piece body,two ends of the test piece body are respectively provided with an internal pressure joint, and the test piece body is provided with a plurality of sensors; a test lead of each sensor penetrates out of the main cylinder barrel to be connected with the test instrument; each transverse servo loading cylinder and the soil action servo loading cylinders are all arranged on the main cylinder barrel; the pistons of two transverse servo loading cylinders are supported on the top of the test piece body; the piston of the other transverse servo loading cylinder is supported on the bottom of the junction of the test piece body and the connecting rod; and the piston of each soil action servo loading cylinder is supported on the bottom of the simulated soil.

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 surface-enhanced Raman scattering (SERS) active substrate based on star-shaped gold nanoparticles and a preparation method thereof, wherein the SERS active substrate is good in enhancement effect, low in cost, simple and convenient in preparation method and good in repeatability. By dipping an ammonified glass sheet into a star-shaped gold nanoparticle solution, the highly uniform SERS active substrate is obtained through the function of static adsorption under the effect of magnetically agitating at a low speed. According to the invention, the star-shaped gold nanoparticles are combined with a static self-assembly method, excellent SERS effect of the star-shaped gold nanoparticles is used for making up main deficiency in preparation of the SERS substrate by using the static self-assembly method, therefore, the high-efficiency SERS active substrate which is simple in preparation method and good in both repeatability and enhancement effect is formed.

The invention discloses a bridge detection method and detection system based on vehicle-bridge coupling vibration analysis. The bridge detection method comprises the following steps: obtaining time-variant model parameters and time-invariant model parameters of having or not having vehicle passing through a group of sensors which are arranged on a bridge in the length direction; computing mass-normalized mode coefficients at moments of a bridge structure; resolving an average value of zoom coefficients at all moments; obtaining a mass-normalized mode of the structure; reconstructing a frequency-function matrix of the structure; conducting displacement flexibility identification. According to the invention, the bridge detection method addresses the inconvenience of on-site detection and poor precision of current flexibility detection devices, overcomes the inability of environment vibration to identify deep parameters of the structure and the high difficulty of impact vibration on-site detection. The detection method not only can obtain static deformation of the structure, and can obtain rigidity information of the structure, thus providing effective evaluation of the safety of the bridge structure.

The invention belongs to the field of three-dimensional movement simulation systems, especially relating to a flight simulation system facing to the power line polling. The system is composed of a polling simulation sub-system, an intelligent control sub-system and a flight simulation sub-system; the polling simulation sub-system is composed of an aircraft navigation module, an image processing module and a micro observation scene model; the intelligent control sub-system is composed of an upper computer module, a controller module, hardware and a driving module; and the aircraft simulation sub-system is composed of a three-dimensional movement module, an image acquiring module, a safety protection module and a data link module. A three-dimensional intelligent movement platform is used for simulating the aircraft action, thereby realizing the functions of target detection, tracking, identifying, power line fault analysis and diagnosis, path planning and the like by capturing, acquiring, processing and analyzing the optical information. The system provides a high-quality experiment platform for the autonomation and intellectualization of the power line polling.

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 a preparation method of a single domain yttrium barium copper oxide superconductor; and the preparation method comprises the following steps: preparing Y2BaCuO5 precursor powder and liquid phase source powder, pressing a Y2BaCuO5 precursor block, a liquid phase block and a supporting bock, preparing a green body, growing a single domain yttrium barium copper oxide block in an infiltration manner, and carrying out oxygen permeation processing. A second phase nanoparticle Y2Ba4CuBiOx / Y2Ba4CuMOx (M is Bi or W) is successfully introduced for forming a flux pinning center by adopting a top seed crystal infiltration growing method and adding a metallic oxide (Bi2O3 powder and WO3 powder) for doping, thereby the powder preparation technology is simplified, the experimental period is shortened, the experiment cost is reduced, and the flux pinning capacity of the superconductor is increased. Y2O3 is used for preparing the supporting block which stably supports two briquettes above the supporting block in the slow cold growing process of an yttrium barium copper oxide block so as to prevent liquid phase from running off. The preparation method can be used for preparing the yttrium barium copper oxide superconductor and can also be used for preparing high-temperature superconductors of other series such as Gd, Sm, Nd, Eu and the like.

A multifunctional gas protection atmosphere case for laser cladding formation. The case body mainly comprises two parts of a protection chamber and a powder collection chamber. The protection chamber is provided with a processing platform with an adjustable height. A processing chamber is enclosed by a front and a back baffle plate, a left side plate, a right side plate, an intermediate clapboard, and an upper sealing soft material. a gas outlet and a temperature monitoring hole are disposed on the left side plate, and a gas inlet and a pressure monitoring hole are disposed on the right side plate. Besides the processing platform, the intermediate clapboard is provided with a powder collection hole which can be opened or closed and is communicated with the power collection chamber at the lower layer. The invention is applicable to laser processing where the processing platform is fixed and a laser head freely moves with a robot, and especially applicable to the laser cladding and formation process of high-temperature easily-oxidized materials; as for powder feeding laser cladding formation, the invention also has the function of powder recovery, which saves experimental materials. Additionally, the case body has a small volume and a light weight, and has excellent characteristics of energy saving, environmental protection, and easy carrying.

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 method for predicting structure evolution of austenite dynamic recrystallization in thermal deformation of plate-strip steel, which belongs to the technical field of steel rolling. The method achieves the predictions of the transformed fraction, the grain size, the grain morphology and the flow stress of dynamic recrystallization by establishing a dynamic recrystallization physical metallurgical model and a dynamic recrystallization cellular automation model. The method achieves the reproduction of the structure evolution of a metal forming process by a computer, not only can save the experimental cost, but also can accelerate the development cycle of a new type of steel. The developed method for predicting the structure evolution of the austenite dynamic recrystallization in the thermal deformation of the plate-strip steel achieves the quantitative, precise and visual descriptions of the grain morphology, the volume fraction and the grain size of the recrystallization process, and can obtain important parameters of the flow stress and the like, thus the method is significant in further analyzing the evolution law of microstructures.

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 invention discloses a high-order rotating blade dynamic similarity test experiment table and a test method, and belongs to the technical field of the blade vibration test experiment. The experiment table disclosed by the invention comprises a base, a rotor driving part, a pneumatic shock excitation part and a data acquisition part, wherein the motor of the rotor driving part is connected with a spindle; a blade disc is sheathed on the spindle; the spindle is fixedly arranged on the base by a bearing pedestal; the total air duct of the pneumatic shock excitation part is communicated with a cylinder; a branch air duct air outlet on the cylinder corresponds to the blade disc; the first eddy current sensor of the data acquisition part is fixedly arranged on the base by a sensor bracket; and a second eddy current sensor is fixedly arranged on the base via a fixed mount. The test method for the high-order rotating blade dynamic similarity test experiment table comprises the following steps: selecting a prototype blade used for research; designing a model blade according to the relevant parameter theory of the prototype blade; manufacturing and processing the model blade used for the experiment; carrying out a static and dynamic kinetics characteristic test on the model blade; and according to a test result, predicting the kinetics characteristic of the prototype blade.

The invention discloses a medium-shallow water homodromous wave current generating method and an experimental water channel. The generating method and the experimental water channel are characterized in that flow distribution channels which are symmetrically bent to the water channel are formed in the two ends of a reservoir, one end of the water channel is fixed on the ground through a triangular fixing support, the other end of the water channel is supported by a lifter, changes of the slope of the water channel can be achieved through adjustment of the lifting height of the lifter, the front end of the water channel is provided with a wave generation plate connected with a wave generation machine, the tail end of the water channel is provided with a side flow channel, a wave-eliminating fixed slope, an arc lifting plate and a wave eliminating device, the tail end of the side flow channel of the water channel is connected with a down pipe and then connected to a water storage tank through a collecting pipe, the water storage tank is connected with a water supply pipe, the tail end of the water supply pipe perpendicularly stretches into the reservoir, and water supply for the reservoir is achieved with the action of a water pump. According to the manufacturing method and the experimental water channel, independent wave current generating can be achieved, homodromous wave current generating also can be achieved, and the experimental research and teaching requirement for load response of a structural object under the action of wave currents at the same time can be met.

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 relates to a multifunctional road detection device and a test method for tires. Two suspension systems and two tire steering mechanisms of the multifunctional road detection device are arranged on a frame and are respectively independently connected with the tested tires on two sides of the multifunctional road detection device, so that the tires can be independently steered and can be adjusted in internally gathered or externally scattered states, and lateral inclination angles of the tires can be adjusted. The multifunctional road detection device and the test method have the advantages that data of rotation angles, lateral force, longitudinal acceleration, lateral acceleration and the like of the tires can be acquired by various relevant sensors during driving, so that mechanical properties of the tires under on-site road conditions can be detected; the problem of difficulty in simulating actual service road surfaces by existing indoor detection devices for tires and problems of unbalanced force under lateral deviation and lateral rolling working conditions and single detection working conditions of existing outdoor detection devices for the tires can be solved; the multifunctional road detection device is simple in structure and easy to control and adjust.

The invention relates to the field of bioinformatics and data mining, in particular to a hierarchical multi-label classification method for protein function prediction, and aims at solving the data set imbalance problem, multi-label problem and hierarchical constraint problem when the conventional classification methods are used for predicting protein functions. The method comprises the following steps of: 1, a training stage: training a data set of each node in a class label hierarchical structure by adopting an SVM classifier in the training stage so as to obtain a group of basic classifiers; and 2, a prediction stage: firstly obtaining preliminary results of unknown samples by using the group of basic classifiers obtained in the training stage in the prediction stage, and processing the results by adopting a TPR algorithm with a weight so as to obtain a final result which satisfies a hierarchical constraint condition and realize the prediction of the protein functions. The hierarchical multi-label classification method for protein function prediction is applied to the field of bioinformatics and data mining.

The invention relates to a fracture-cave carbonate reservoir physical model and a displacement simulation experimental device and system. The fracture-cave carbonate reservoir physical model comprises caves, fractures, a base plate and a filler, wherein the caves and the fractures are arranged on the base plate and connected into a whole; the filler is used for simulating the cave filling conditions; and the fracture-cave carbonate reservoir physical model is provided with a filler opening, a withdrawal opening and a bottom water opening. The fracture-cave reservoir visual displacement experimental device is more approximate to an actual reservoir model, particularly for cave and fracture-cave reservoirs, can simulate the discrete distribution feature of the fractures and caves, and is more practical for simulation of filled caves. In addition, owing to the detachability of the fracture-cave model, the operability and the flexibility of experiments are enhanced; the model setting, adjusting and maintaining periods are shortened; the model is simple in manufacture process and can be repeatedly used; and therefore, the experiment cost is greatly lowered.

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 relates to a physical simulation method of the solidification process of strip continuous casting and a realization device thereof, which belong to the field of physical simulation and control of growth process of metal solidification structures. The invention provides a physical simulation method of the solidification process of the strip continuous casting process, so that a physical simulation test can reach the cooling rate of actual strip continuous casting to simulate the heat transfer process of the strip continuous casting; and the method researches an evolution law of solidification structures of the strip continuous casting and a basic law of the solidification by adjusting alloy element components and strip thickness, and can contrastively research an influence law of a rolling force on the solidification during the strip continuous casting. The invention provides a set of equipment which can realize physical simulation on the solidification process of the strip continuous casting. The invention designs a physical simulation device which has a concise structure and small scale and is flexible and smart, wherein main parameters of the device comprise that: the final vacuum is 6.6*10-4Pa, the radius of four water-cooled copper crucibles is 25mm, the working current is between 800 and 1,000A, and the rotating speed of electromagnetic stirring is between 0 and 200rpm.

The invention relates to a method for estimating the residual magnetism of a transformer core based on the slope of a local hysteresis loop, which comprises the following steps: S1, measuring the saturation hysteresis loop of a transformer core material; S2, using a JA model to simulate the hysteresis characteristic of the transformer coil; S3, getting the relation between the residual magnetism and the slope of a local hysteresis loop near a residual magnetism point based on the JA model, and fitting the relation to get a corresponding formula relation; and S4, powering on and testing a transformer coil under test, getting the positive and negative slope near the residual magnetism point through electromagnetic relation conversion, and calculating the residual magnetism value according tothe formula obtained in the previous step. The method of the invention is simple. There is only the need to apply small positive and negative excitation and record the voltage and current in the residual magnetism calculation experiment. No complicated online experiment is needed. The test power is low, and the experimental cost is low.

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.

The invention discloses a protection device for tumbling out of control of a rotor type unmanned aerial vehicle (UAV), and the technical scheme thereof is characterized in comprising ejection cylinders, a high-pressure gas cylinder, ejection opening and closing doors, a posture sensor and a control module, wherein top plates are mounted inside the ejection cylinders; each top plate divides the corresponding ejection cylinder into a high-pressure chamber and an ejection chamber; each ejection chamber is provided with a self-throwing parachute and the bottom of each high-pressure chamber is provided with an air inlet; the high-pressure gas cylinder is respectively connected with the air inlets of the two ejection cylinders through air duct pipes, and electromagnetic valves are respectively mounted near the two air inlets; the ejection opening and closing doors are hinged to the opening of the ejection cylinders; hinge shafts are provided with torsion springs; fixed parts for closing the ejection opening and closing doors at the opening of the ejection cylinders are mounted on the ejection cylinders; the posture sensor is arranged in a UAV body to periodically detect posture change data of the UAV body; and the control module receives the posture change data and outputs a corresponding control signal to the corresponding solenoid valve and the corresponding fixed part according to an angle of inclination to control the self-throwing parachute in the corresponding ejector cylinder to be forced out of the corresponding ejection chamber under the high pressure gas.