203 results about "Process research" patented technology

Systems and methods for operating an anonymous peer-to-peer (“P2P”) privacy panel for audience measurement is disclosed. A plurality of portable devices are configured to record and process research data pursuant to a research operation. Each of the panelists associated with each portable devices provide panelist data to a central site, where the panelist data includes demographic information, previous media exposure data, and other data. In accordance with panelist data, a customized P2P network is created where media exposure data is obfuscated and communicate among portable devices in the network. By utilizing a P2P network together with obfuscation techniques, panelist privacy is greatly increased.

The invention relates to a numerical value simulation and numerical value calculation method for an overall process of debris flow. By researching on a debris flow formation process and mechanism, debris flow channel material starting, and a debris flow movement accumulating process numerical value calculation method, and by constructing a debris flow dynamic process and an engineering regulation and control numerical value simulation platform at the same time, the scientificity and reliability of the research on the dynamic process of the debris flow can be improved, so that technological support is supplied for debris flow disaster alleviation and better service is supplied for the debris flow disaster alleviation; dynamic characteristic of debris flow slurry and big stones are taken into full consideration in a proposed debris flow movement model; a concept of interchange rate of materials of debris flow and a movable bed is introduced initially; and corrosion of debris flow along the way and disaster scale change are taken into consideration to form the debris flow formation-movement-accumulation numerical value simulation and numerical value calculation method based on the overall process. By adoption of the numerical value simulation and numerical value calculation method, the scientificity and reliability of the research on the dynamic process of the debris flow can be improved, so that technological support is supplied for debris flow disaster alleviation and better service is supplied for the debris flow disaster alleviation.

The invention relates to the field of biotechnologies, and provides a construction method for a sialidase gene knockout mouse model and application thereof. An in vitro and vivo targeted mouse genomeNPL is used for genetically recombining a CRISPR knockout plasmid vector, and a diploid double-knockout NPL mouse knockout model is successfully constructed through an oosperm microinjection technology. The NPL has the important function in a pathophysiological process of a body. Vicious transformation of a cancer cell is always along with overexpression of sialic acid. Now, the overexpression ofthe sialic acid has become one of important markers of the malignant transformation and transferring of a tumor. The model is capable of constructing a new research platform for researching a processof cell canceration, beneficial to a key step of researching generation and transferring of the tumor, and providing a foundation for the research and development of a novel anti-tumor drug.

The invention relates to a method for tracing filling directions and paths of deep fossil oil reservoirs. The method includes steps of determining that reservoir bitumen and natural gas are factors for decomposition and disproportionation reaction of crude oil and have genesis relationship with each other; judging in-situ decomposition factors of the fossil oil reservoirs; tracking the filling directions and paths of the fossil oil reservoirs. The method has the advantages that the filling directions and paths of the fossil oil reservoirs are traced by the aid of the reservoir bitumen according to genesis relationships between the reservoir bitumen and the fossil oil reservoirs, and accordingly the method is applicable to completely decomposed deep high-mature and post-mature fossil oil reservoirs where natural gas is formed; study on processes in which the fossil oil reservoir are developed into natural gas reservoirs can be implemented; relationships between the reservoir bitumen and the natural gas can be determined according to relationships among reservoir bitumen R<o>, the natural gas R<o> and reservoir stratums R<o>, and whether the natural gas is an in-situ decomposition factor of the fossil oil reservoirs or not can be judged; study on reservoir formation mechanisms of the deep high-mature and post-mature natural gas reservoirs can be deepened and improved, study results are reliable, and the method can effectively serve for deep natural gas exploration.

The embodiment of the invention provides a micrometer order solid particle ignition burning test device under a jet stream condition. The device comprises four parts of a gas generator part, an afterburning chamber part, a sampling part and an observing part; the test device can change the ratio of fuel to an oxidant in the gas generator and realize stable controllable adjustment on mass and flow of solid particles, thus realizing the simulation of a working environment in the afterburning chamber of a ramjet of a solid rocket under different working conditions; a test process is monitored in real time by equipment such as a sensor and a high speed camera, a burnt product of the high energy solid particles is sampled in the test process, research on an ignition burning process of the micrometer order high energy solid in the afterburning chamber is realized, the test preparation time is shorter, the expense cost is lower, more observing methods can be used for a burning process in the afterburning chamber, more test data are obtained, the test system is good in reutilization, and engineering reference value of the obtained test data is high.

The invention relates to a steel rail on-line wind-jet quenching heat treatment simulation experiment device, and belongs to the technical field of steel metallurgy. The experiment device is composed of the structures of: a Laval-type flat-slot nozzle system, a steel rail guiding system, a frame system, a valve system, a compressed air pipe system, a roller way system, a detection instrument system, a steel rail heating furnace system, and the like. With wind, water, heating furnace, and roller way conditions in an experimental innovation platform in metallurgical rolling, a steel rail on-line wind-jet quenching heat treatment simulation experiment device is designed and manufactured, and a steel rail on-line wind-jet quenching heat treatment simulation experiment method is developed. The method and the device are used for carrying out heavy rail full-length on-line quenching simulation experimental researches. The experiment method is simple and reliable. With the method, heavy rail full-length on-line quenching process research period can be greatly shortened, and process research cost can be reduced. The method is a feasible method of laboratory simulation research currently. With the device and he method, technical support can be provided for a heavy rail full-length on-line quenching production line.

Systems and methods for operating an anonymous peer-to-peer (“P2P”) privacy panel for audience measurement is disclosed. A plurality of processing devices are configured to record and process research data pursuant to a research operation. Each of the users associated with each processing devices provide user data to a central site, where the user data includes demographic information, previous media exposure data, and other data. In accordance with user data, a customized P2P network is created where media exposure data including audio codes, signatures and data objects is obfuscated and communicate among portable devices in the network. By utilizing a P2P network, together with obfuscation techniques, panelist privacy is greatly increased.

The invention relates to a behavior safety control method of a moving riding nursing robot. The moving riding nursing robot is moved and ridden through a front hoop type. The method comprises the steps of studying the process of the motions that the robot is moved and ridden, analyzing posture motion parameters of the robot and the human body in each motion cycle, obtaining the function relation of the posture of the moving riding nursing robot and the human body posture, namely change conditions of the gravity of the human body, further obtaining a computing model of robot postures and human body gravity distribution, with the computing model being a reference standard, in the moving riding nursing type robot actual motion process, and through the combination of a human body brain wave signal and a grip force handle force signal, monitoring a pressure value of a support position in real time, when an unreasonable posture is detected, by comparing an error between an actual value and a computing model theoretical value, timely adjusting a motion posture of the robot, so that a safe and comfortable nursing motion effect is achieved.

The invention relates to an ionic liquid system electrochemical process in-situ research device. According to the device, an in-situ photo-electrochemical tank is adopted as a core. Under the control and adjustment of a multifunctional automatic adjusting rack, devices such as a flow injection analyzer, an in-situ infrared spectrometer, a Raman spectrometer, a metallurgical microscope, a multi-channel electrochemical workstation, a quartz crystal microbalance, and the like can be applied in combination. Detection liquid is placed in the in-situ photo-electrochemical tank, and a reaction process is subjected to real-time monitoring by using a computer control system. With the device provided by the invention, on a basis of conventional electrochemical tests, morphology, structure, composition, concentration change characterizations upon electrode surface / interface sediment, electrolyte, decomposition products, gas product, and the like can be realized, and powerful support can be provided for ionic liquid electrochemical process researches. The device has the characteristics of compact structure, high operation automation degree, precise detection, reasonable design, and the like.

The invention provides an oil-gas migration physical simulation device and an oil-gas migration experiment method. The oil-gas migration physical simulation device comprises a thermostat and a sand filling pipe arranged in the thermostat. The oil-gas migration experiment method comprises the following steps of: arranging a normal pressure glass sand filling pipe in the thermostat, performing an oil-gas secondary migration experiment on crude oil, performing visual observation, and studying the macroscopic oil-gas migration process; and arranging a high pressure stainless steel sand filling pipe in the thermostat, performing the oil-gas secondary migration experiment on the crude oil, and studying microcosmic component change in the oil-gas migration process. By the device and the method, oil-gas secondary migration visual physical simulation and high temperature and high pressure non-visual physical simulation functions are integrated, the macroscopic oil-gas secondary migration process and a microcosmic migration mechanism are well studied jointly, and the oil-gas secondary migration physical simulation study means is perfected.

A process for manufacturing a ship hatch cover of a ten-thousand-tonnage container ship belongs to the shipbuilding field and comprises the following steps of: manufacturing an assembly jig; calibrating the levelness of the assembly jig before building and dividing the assembly jig rationally according to the product; lofting and blanking, detailing shrinkage allowance to each part of the hatch cover, and elaborately setting the shrinkage allowance; fabricating parts: dividing the hatch cover into three major assembly areas, requiring that all structures of the part areas are connected through flat fillet weld or butt weld; assembling the structure of the hatch cover, and then checking and meeting various accuracy requirements; mounting a container foot; performing tracking, supervision and measurement by using QC from container seat marking, before welding of the container seats and after welding of the container seats, repairing the unaccepted container seat immediately, and finally performing a container hoisting test to perfectly guarantee the accuracy of the container foot. With the abovementioned process research and improvement, the production efficiency can be improved to a large extent; and compared with the traditional building way, about 8% of energy can be saved for each set and the building period can be shorted by about three weeks.

The invention discloses a pro-drug as shown in general formula (I), which is formed by coupling camptothecin or a derivative of the camptothecin with non-linear configuration glycol polyethylene, wherein, the definition for varied groups is available in the specification. A physiological disposition research on nude mice discloses that: the pro-drug has a time-delay plasma concentration - time curve, and the plasma concentration can still be maintained at over 100ng / ml 72 hours after intravenous medication. Evaluation on physiological drug effect shows that the pro-drug has strong growth inhibiting effect against the LOVO HCT116 cell line transplantable tumor inoculated into the nude mice and also has obvious growth inhibitory activity against human lung carcinoma H460 cell line transportable tumor inoculated into the nude mice. The inhibition of the pro-drug is better than that of Irinotecan, a positive control drug and has no obvious systemic toxicity.

The invention discloses a force tracing method for an atomic force microscope (AFM), which relates to the technical field of micro force measurement methods and solves the problem that force signals obtained by the traditional AFM single molecule force spectrum method are easily regarded as signals generated by motions of an AFM probe but not signals generated in a dynamic process on cell surfaces. The force tracing method for the AFM comprises the following steps of: after needle feed is finished under the control of a feedback regulation system, closing the feedback regulation system, and determining a position of the AFM probe in a Z direction when the AFM probe is contacted with the surface of a tested object through an obtained force-distance curve; gradually approaching the AFM probe to the surface of the tested object, and when the AFM probe is just contacted with the surface of the tested object, closing the feedback regulation system and stopping feeding the probe to ensure that a cantilever is deflected immediately; and acquiring a relation of the deflection of the cantilever along with time by utilizing a data acquisition card. According to the force tracing method, influences of the motions in the Z direction of the AFM probe driven by a piezoelectric ceramic scanner on dynamic process researches of the surface of the tested object are avoided.

The invention provides an anti-inflammatory, antalgic and antibacterial extract which is extracted from rape bee-pollen according to lots of process researches. Strict tests prove that the extract has anti-inflammatory, antalgic and antibacterial functions and inhibition effect on human leukocyte elastase, excellent antalgic effect on visceral pain caused by ethylic acid and external pain caused by a hot plate in mice and excellent inhibition effect on Escherichia coli, staphylococcus aureus, pseudomonas aeruginosa, bacillus subtilis and other bacterial. The extract can be used in the development of plant-source anti-inflammatory agents, antalgics and bacteriostatic agents. In addition, China's rape pollen productivity is huge, so the rape pollen can be used as the raw material for the plant-source anti-inflammatory agents, antalgics and bacteriostatic agents; and the extract has the advantages of low cost and simple process flow.

The invention provides a real-time high-resolution spatio-temporal distribution imaging method and system for focused ultrasonic cavitation. A cavitation acoustic scattering signal is filtered to obtain a steady state and an inertial cavitation signal; an existing passive acoustic imaging algorithm is modified based on a high-resolution coherence coefficient to obtain a high-resolution steady state and an inertial cavitation image; the cavitation image is screened, the additional cavitation energy is removed, the steady state and an inertial cavitation feature image are obtained through the principal component analysis, and on the basis, the spatio-temporal distribution of the steady state and the inertial cavitation is obtained. The method can solve the problems that active ultrasound imaging can only obtain cavitation microbubble distribution and cannot obtain the spatio-temporal distribution of a cavitation activity, and passive acoustic imaging is poor in resolution and lacks effective cavitation spatio-temporal distribution calculation methods, provide an effective means for cavitation transient physics process researches and focused ultrasound therapy evaluation, and lay thefoundation for the clinical application of ultrasound-guided and monitored focused ultrasound therapy systems.

The invention provides a simulation method for a plasma generator. The method comprises: Step S1, performing three-dimensional modeling on the plasma generator in ANSYS software; Step S2, performing grid division on an established model; Step S3, setting material and boundary conditions of the model; Step S4, loading a magnetohydrodynamic (MHD) module for the model; Step S5, initializing a flow field; Step S6, selecting a solver, a velocity field and pressure field coupling mode and a spatial discretization format; and Step S7, obtaining various field data of the plasma generator during operation period through simulation calculation. According to the method, various difficulties in physical process researches and experimental processes of an existing plasma generator are overcome, comprehensive and accurate modeling analysis is performed on an electric field, a magnetic field, a thermal force field and the flow field of the generator, an analytic method desiderated for the industrial application of the plasma generator is provided, and the method can become important means for developing the plasma generator.

The invention discloses a method for evaluating damage and fatigue life of a microscopic-macroscopic scale sheet metal forming process model. According to the method of the invention, a microscopic plastic constitutive model is established and macro geometry is coupled; furthermore sheet metal forming process simulation is performed; based on sheet metal forming process simulation, a microscopic-macroscopic coupling fatigue damage model is established for performing fatigue life simulation; a sheet metal forming process and a fatigue failure mechanism are researched, thereby supplying theoretical guidance and technology optimization basis for engineering application. Sheet metal forming process material performance and plastic deformation evolution distribution are researched in a microscopic aspect. Influence and contribution degree of microscopic characteristics such as crystal grain size and orientation distribution and precipitated phase distribution to the sheet metal forming process are researched. Furthermore the macroscopic model and process researching fatigue damage are coupled, and the component fatigue life is evaluated. The invention provides the reliable high-efficiency calculating model and the evaluating method. Establishment of the related model and the algorithm has important science innovation and high engineering application value.

The invention relates to a photocatalytic in-situ characterization system used for researching a catalyst surface reaction process and an organic matter environment photochemical process. The photocatalytic in-situ characterization system comprises an ultrahigh-vacuum cavity, an in-situ mass spectrum module, an in-situ reflection infrared spectrum module, an energy spectrum module, a sample surface etching and cleaning part, a sample control platform, an online sample replacing part, a vacuum pump set, an in-situ lighting component and sample feeding part. By the photocatalytic in-situ characterization system, in-situ etching and cleaning can be performed on the surface of a solid-phase sample, and reaction details, such as reactant absorption modes, molecule feature group change, surface element variety qualitative tests and in-situ quantitative and qualitative detection of intermediates during catalytic reaction or programmed temperature rising, on the surface of the solid-phase catalyst and the gas-liquid and liquid-solid interfaces during the (photo) catalytic reaction can be systematically researched.

The invention discloses a commodity distribution management system of a chain supermarket, and provides a reasonable and effective commodity distribution management system. The main advantage is that the problem in distribution businesses between chain stores and a distribution center, between suppliers and the distribution center and between consumers and the distribution center is efficiently solved. The system comprises six units including an order management unit, a sorting management unit, a distribution management unit, a transport management unit, a warehouse management unit and a system management unit. For real working process research and development of the supermarket, the system is complete in function and high in pertinence; by adopting a structured design method, based on a high-cohesion and low-coupling principle, modular and component-based development of function points is realized; and a development process is controlled and a module structure is optimized, so that the difficulty and complexity of realization are lowered, the repeated development cost is reduced, and the readability and maintainability of a program are improved on the basis of ensuring the function points of the system to be realized.

A forging process of a left half axle and a right half axle for an automobile relates to the technical field of forging, and comprises the following steps: blanking, heating, pre-forging, forming, trimming, hardening and tempering and shot-blasting. The forging process has the benefits that the applicant conducts process research and improvement to solve existing problems and determines that the pre-forging method replaces cold-extruding or lathe turning and forming is carried out after pre-forging to meet the process requirements, so that the manufacturing technology is simplified, the production cost is lowered and the production efficiency is improved.

The invention discloses an electrochemical impedance and ultraviolet visible absorption spectrum combined analysis device and method. According to a measuring device, a conventional electrochemical workstation and an ultraviolet visible absorption spectrometer are connected through a signal collection / analysis instrument, intermediate products or adsorbates produced on the surfaces of electrodes in a complicated solid liquid interphase reaction are determined through simultaneous measurement research of electrochemical impedance and ultraviolet visible absorption spectrum impedance of the working electrodes in an electrochemical three-electrode system in a frequency domain, and evidence is provided for effectiveness of the intermediate products introduced in an electrochemical equivalent circuit. As for a complicated electrochemical reaction, a good support function is provided for conductive high-molecular polymer doping, metal corrosion and protection and reaction mechanism and reaction process research of an electrode solid liquid interphase, and the device and the method have a wide application prospect.

The invention relates to a numerical simulation method of a complex profile extrusion process, and belongs to the technical field of metal extrusion processing. The method comprises the steps of 1, adopting CAD software to establish a three-dimensional geometric model of a mold and a blank, and inputting the three-dimensional geometric model to a simulated system; 2, in the shunt period of profileextrusion, adopting a fractional step finite element method to conduct numerical simulation; 3, in the welding and shaping periods of the profile extrusion, adopting a finite volume method based on aEuler network to conduct numerical simulation; 4, if profile completely flows out of a work belt and the extrusion process reaches a steady state, completing a whole simulation process, otherwise repeating step 3 until the steady state is reached. The numerical simulation method of the complex profile extrusion process has the advantages of being short in calculation time and high in simulation precision, and is a highly effective method for researching the extrusion process of large complex cross-section profile.

The invention provides an indoor simulation system used for the process study between the sediments and the water surface of a lake. The indoor simulation system mainly comprises a water power disturbance system, an illuminating system, a constant-temperature water bathing system and an automatic sampling system. The invention has the advantages that the lake sediments are collected and directly put into a heat reserving box, the surface water power disturbance, the surface illumination, the surface temperature and the overlying water chemical features can be manually controlled, and long-time operation and multi-sampling are also available, without influencing the sediments and the surface process; the invention can, in fairly large scope, satisfy the requirements of the scheduled experimental conditions, so as to achieve the basic requirements of the researchers on studying the surface chemical or biological process. The system, being reliable and cheap, has advantages of compact structure, stable operation, long-time continuous running and long service life as well as convenient component disassembly-assembly and low cost.

The invention discloses a matrix metalloproteinase-2 specific multi-modality molecular image probe preparation method and application thereof. The preparation method comprises the following steps: 1)preparing peptide substrates for matrix metalloproteinase-2(MMP-2) specific identification; 2) modifying near infrared fluorescent dye on peptide substrate; 3) modifying fluorescent quenching group onpeptide substrate; 4) connecting different molecular weight PEG or tumor targeting group RGD on peptide substrate modified with near infrared fluorescent dye and fluorescent quenching group; 5) labeling the nuclide on the above modified peptide substrate side chain tyrosine. Compared with the prior art, the matrix metalloproteinase-2 specific multi-modality molecular image probe preparation method has the advantages that: 1) by utilizing the specificity and responsiveness of the MMP-2 protease by the probe, so that the probe is selectively enriched at the tumor site so as to improve the targeting property of the probe to the tumor; 2) performing multi-modality imaging in a living body tumor by using advanced molecular imaging technology such as optical, opto-acoustic, SPECT and the like,improving the sensitivity and accuracy of tumor imaging, and finally achieving accurate positioning of the tumor; 3) providing a new train of thought and method for early diagnosis, process research and prognosis evaluation of tumor.

The invention relates to a magnetic liquid sealing process researching device and belongs to the technical field of mechanical engineering sealing. The magnetic liquid sealing process researching device is applicable to test research on the magnetic liquid sealing process in science and technology museums and large and medium-sized colleges. All the parts of the magnetic liquid sealing process researching device are connected with one another, wherein a transparent glass block (7) is inlaid and sealed on an outer sleeve (1); a vacuum pump (14) is communicated with a sealed space (16) through a pipeline and a valve (15) thereon and is hermetically connected to the outer sleeve; an air pressure gauge (8) is communicated with a toothed groove of a first pole shoe (4) through the pipeline and is hermetically connected to the transparent glass block; a first bearing (2), the first pole shoe (4) with a second rubber sealing ring, a permanent magnet (11), a second pole shoe with a first rubber sealing ring and a second bearing (3) are arranged on a non-magnetic shaft (9) sequentially to form a sealing component; magnetic liquid (6) is injected into the outer circumference of the permanent magnet; the sealing component is arranged on a boss of an inner hole of the outer sleeve; and a flange plate (10) is fixed on the outer sleeve, so that the sealing component can be fixed axially.

The invention discloses a research experiment device and method of a tiny particle sample crushing process. A loading device selects a linear sliding platform structure as a loading part, a coder assembled at the bottom of a linear sliding platform rotating screw generates a continuous pulse signal in the process of loading to trigger a laser displacement sensor and a pressure sensor to synchronously record displacement and experiment force at the same time in the process when a sample is pressed and crushed, and the research experiment device is provided with a high-speed microscopic camera which records the real-time process of the sample from being pressed to being crushed. The research experiment device can be used for uniaxial compression crushing experiments of various tiny particlesamples (01.1-2mm) which are nonmetallic and irregular in shape, testing mechanical parameters like crushing strength and crushing work of the sample and studying the sample crushing process. In addition, the research experiment device can be utilized for study damage behaviors of a cutting board and a pressure head material in the process of sample crushing.

The invention discloses an automatic multi-angle in-situ continuous observation platform system of a spectrograph and a control method. The system comprises tower-mounted equipment and a small industrial computer, wherein the tower-mounted equipment comprises a double-channel spectrometer, a rotary pan-tilt and a pan-tilt controller; the small industrial computer is used for receiving and storing data and sending control instructions to regulate operation of the system; a radiation sensor pointing to the sky and a canopy sensor pointing to an observed ground object are connected on an optical fiber of the double-channel spectrometer; the canopy sensor is mounted on the rotary pan-tilt which is connected with the small industrial computer through the pan-tilt controller, and the pan-tilt controller is used for adjusting the rotation direction, the angle interval and the time interval of the rotary pan-tilt and regulating and positioning the instantaneous position of the canopy sensor of the double-channel spectrometer. Automatic multi-angle observation can be realized, the observation angle is accurate, the observation height is not limited, observation data are not prone to loss, and an important means is provided for key process research and dimension extension research of the ecological system.

The invention discloses an adjustable multifunctional fractured rock mass collapse-slide testing device and a use method of the adjustable multifunctional fractured rock mass collapse-slide testing device. The adjustable multifunctional fractured rock mass collapse-slide testing device comprises a gathering zone support, a collapse-slide rail support, a stretchable rod A, a stretchable rod B, a gathering zone testing tank and a collapse-slide rail testing tank. The two ends of the bottom of the gathering zone testing tank are connected with the upper portion of the stretchable rod A. The two ends of the bottom of the collapse-slide rail testing tank are connected with the upper portion of the stretchable rod B. The gathering zone support and the collapse-slide rail support are installed on a base supporting plate and a distance adjustment sliding rail base through thread fasteners. A partition plate in the collapse-slide rail testing tank is pulled out, fractured rock mass materials collapse and slide down, pass through a slope material containing tank to reach the gathering zone testing tank and gradually stop moving in a gathering zone, a time of fractured rock mass gathering process test is completed, and the testing result is recorded. By means of the adjustable multifunctional fractured rock mass collapse-slide testing device and the use method, the fractured rock mass collapse-slide process researching test has the repeatability, the complementariness and the verification performance, and the adjustable multifunctional fractured rock mass collapse-slide testing device and the use method have the advantages of being capable of being disassembled and assembled, and being easy and convenient to operate, diverse in function and high in repeatability.

The invention provides an indoor simulation system applied to pollutant migration process researches under artificial rainfall. The indoor simulation system can satisfy similarity conditions of the rainfall uniformity, the median raindrop diameter, the terminal velocity and the raindrop spectrum, can be directly used in the researches and stimulation of the migration process of soil (deposit)-water interface pollutants under the artificial rainfall conditions, and mainly includes a rainfall control system, a pollutant vertical transport simulation system and a sample collection system; and the above simulation device can be used as an experimental device for carrying out migration conversion and repair mechanism researches of pollutants in soil / sediment. The simulation device has the characteristics of strong practicability, high reliability, low cost, compact structure, convenient installation, demounting and replacement of parts, suitable simulation conditions, maneuverability and good application popularization value.