600results about How to "Improve experimental precision" patented technology

The invention relates to a device and a method for testing mechanical property of a hyper-elastic material. The device mainly comprises a reinforcing piece (4) at the end of a test piece and a test piece clamp, wherein the reinforcing piece (4) has a trapezoidal cross section; a clamping port of the clamp is an inclined surface; the reinforcing piece (4) is adhered to the end of the test piece and is arranged in the clamp, the inclined surface of the clamp tightly clamps the inclined surface of the reinforcing piece (4), and the clamp is self-locked in the tensioning process and is prevented from locally deforming. The device is applied to multiple stress-strain tests of the hyper-elastic material such as uniaxial tension, equally biaxial tension and planar tension (pure shear). Stress data is acquired by a data acquisition system of an electronic universal testing machine, and the strain data is acquired by a charge coupled device (CCD) image acquisition device. Due to the technical scheme, the clamping force is high when the tension is high in the process of tensioning the test piece, so that the test piece is uniformly stressed, more accurate testing data can be obtained, and the mechanical property parameters of the hyper-elastic material obtained accordingly are more reliable.

The invention discloses a detection system for the total number of bacteria in livestock meat. The detection system comprises a light source apparatus emitting a spot light source to irradiate a livestock meat sample, a hyperspectral imaging apparatus used for acquiring spectral information of the livestock meat sample, an electric adjusting apparatus used for adjusting the position of the livestock meat sample and the position of the hyperspectral imaging apparatus, a controller apparatus used for controlling the motion of a motor of the electric adjusting apparatus, a sensor apparatus used for determining the position of the livestock meat sample and the position of the hyperspectral imaging apparatus and outputting position signals, a computer processor used for receiving the position signals, outputting processed position signals to the controller apparatus, analyzing hyperspectral information of the livestock meat sample and outputting analysis results and a dark box used for placement of the hyperspectral imaging apparatus. According to the invention, automatic real-time detection and real-time outputting of detection results are realized, experiment efficiency and accuracy are improved, obtained results are more reliable, and an operation method of the detection system is simple.

The invention discloses an experiment device for simulating retention of in-pile melts obtained by melting of a reactor core of a nuclear reactor and an experiment method. The device consists of a copper heating section, a quartz glass component and a data measurement system. According to the experiment device, a melt hard shell of the reactor core is simulated through a semispherical copper ball shell; decay heat is simulated through a spiral heating wire embedded into the semispherical shell; the inner wall surface of a lower enclosure of a pressure container is simulated through quartz glass, and therefore, a flowing heat exchange phenomenon of a narrow gap between the inner wall surface of the pressure container of the reactor and the melt hard shell can be simulated, and the influence on the retention of the in-pile melts caused by flowing of water in the narrow gap can be researched. The experiment device has the advantages of visible experiment process, high experiment precision, high safety, easiness in operation and the like. A running practice shows that the experiment device runs stably and can thoroughly meet a design requirement.

The invention belongs to the field of optical parameter measurement in tissue optics research, and relates to a multi-wavelength tissue optical parameter trans-construction method based on a neural network. The method comprises: using double integrating sphere technology and a high-sensitivity photoelectric detector to collect reflected light and transmitted light on the surface of a tested sample, and using a method of relative measurement to obtain the reflectivity, diffuse transmittance and collimation transmittance of the sample; using a Monte Carlo method to establish a mapping model of a tissue optical parameter (mua, mus and g) to a measurement amount (Rd, Td and Tc); establishing a BP neural network containing two buried layers, and adopting a gradient descent weight learning function to train a BP network; and predicting the optical parameter of the measured sample through the (Rd, Td and Tc) obtained by measurement in real time, wherein an input signal of the neural network is (Rd, Td and Tc), and an output signal is (mua, mus and g). The invention provides a device adopted by the method at the same time. The method provided by the invention can quickly and accurately measure the tissue optical parameters under multi-wavelength.

The invention discloses a device and a method for testing a low-permeability core starting pressure gradient at the high temperature and the high pressure with an unsteady state method. The method comprises steps as follows: a to-be-tested low-permeability core sample is prepared and placed in a core holder; an automatic water pump is used for providing required confining pressure and return pressure for the core holder; a third valve is closed, and a gas pressurization device is used for pressurizing a standard bottle; after a second pressure sensor stably reads, the third valve is opened, and gas in the standard bottle permeates an inlet of the core holder; a controller records a pressure value, changing over time, read by the second pressure sensor and stops recording until the change rate of a reading number of the second pressure sensor is lower than a threshold value; and the core starting pressure gradient is calculated according to the reading number, changing over time, of the second pressure sensor. According to the device and the method, all that is required is to add a high-precision pressure sensor at an outlet of the standard bottle for recording pressure of the outlet, the high-precision pressure sensor has characteristics of low cost, high test precision, large range and the like, and the measurement problem of low flow speed is solved.

The invention relates to a leaching device used in vertical transfer of pollutants in soil. The leaching device comprises a spray nozzle, a water flow meter, a leaching column for holding an experimental earth pillar and a percolate accommodating container, wherein, the leaching column is internally provided with at least two filter layers capable of filtering leaching liquid, a filter layer structure is respectively arranged on the upper and lower ends of the experimental earth pillar, and each filter layer is provided with a filter screen layer, a filter bulb layer and a filter paper layer; and in addition, the height of the leaching column body is 90cm-150cm, and the inner diameter of the cross section of the column body is 5cm-15cm. The leaching device has the advantages that on the basis of the large axial size of the leaching column, vertical transfer of the pollutants in the profile of the deeper soil can be simulated; by setting the water flow meter, the flow velocity and flow rate of injection water can be accurately controlled; by setting the upper filter layer, the injection water can be uniformly sprayed; and by setting the lower filter layer, the filter effect can be ensured and percolate can be timely and effectively discharged.

The invention discloses a dynamic testing device for the isolation ability of a cementing sheath and an experimental method. The device comprises a working platform and a testing main body, wherein the working platform comprises a computer; the testing main body comprises kettle covers on the top and at the bottom; the middle part of the testing main body is taken as a kettle body; the kettle body comprises an analog stratum, a cement sheath and a casing from outside to inside in sequence; a solid column body is inserted into the casing; filter screens and eccentric bases are arranged on contact parts between the kettle covers and a stratum-cement sheath-casing end face. The method comprises the following steps: preparing cement slurry, and filling the cement slurry into an annular space; waiting on cement setting, curing and hardening into a sheath; changing the temperature and pressure in the casing, testing radial displacement of the casing and peripheral displacement of the analog stratum, and monitoring the airtightness failure condition of the cement sheath through an acoustic wave testing curve; detecting micro-cracks generated in the cement sheath and micro-annuluses on interfaces I and II, and analyzing the airtightness failure form of the cement sheath. The dynamic testing device is reliable in principle, and is easy and convenient to operate; integrated curing is performed in an experimental process, and more data support and a theoretical basis are provided for researches for testing the isolation ability of the cementing sheath.

The invention relates to the field of experiment test instrument of a soil engineering material of geotechnical engineering and in particular relates to an intelligent soil engineering shear rheometer. The rheometer consists of an experiment platform, a loading system, a data acquisition system and a data processing system, wherein the experiment platform ensures the horizontality and stability of an experiment test; the loading system consists of a vertical loading system and a horizontal loading system, and realizes the loading through weights to ensure the load accuracy; the data acquisition system consists of a displacement meter and a tension sensor, has a relatively high accuracy, transmits and receives a data signal in a wireless manner, and ensures remote processing and monitoring of an experiment; and the data processing system realizes the functions of real-time automatic acquisition, storage, display and processing of data through software development. Compared with the prior art, the intelligent soil engineering shear rheometer provided by the invention has simple operation steps and relatively high experiment accuracy, realizes remote operation, and has a relatively high degree of intellectualization and relatively great application values for a soil engineering rheological test experiment.

The invention discloses an automatic soil detection system which comprises a working platform, a soil treating unit, a water measuring unit, a sampling unit and a testing unit. According to the automatic soil detection system, due to the soil treating unit, a soil crushing effect is good, the subsequent testing accuracy is improved, a probe of a soil sensor can be replaced, and thus the automatic soil detection system is capable of measuring different crops and different soil layers without replacing the whole sensor, and is simple in structure, low in cost and convenient to use; the sampling unit is driven by adopting a multi-stage hydraulic cylinder, the stroke of the hydraulic cylinder is large, and thus deep soil is conveniently sampled; the hydraulic cylinder of the automatic soil detection system directly drives a sampling rod to extend undergrounds for sampling without adopting a deep excavating manner, the damage to the aboveground vegetation is small, the convenience is brought to sampling, and the time and labor are saved; different reagents can be set by the testing unit as required so that contents of different ingredients are conveniently detected; the automatic soil detection system has multiple functions, and is high in automation degree, and convenient to move.

The invention discloses a spatial light modulator-based dual-beam optical tweezers system. The system includes a laser, a first telescope system, a half wave plate, a first reflector, a spatial light modulator, a quarter-wave plate, a focusing lens, a second reflector, a second telescope system, an objective lens and a sample stage which are arranged sequentially along an optical path, wherein the half wave plate is used for adjusting the ratio of horizontal polarized light and vertical polarized light in a received beam, the first reflector is used for reflecting the received beam to a corresponding modulation area on the spatial light modulator, and the spatial light modulator is provided with two modulation areas loaded with different phase image information; the beam is subjected to phase modulation once, and then, the phase-modulated beam passes through the quarter-wave plate and the focusing lens, and thereafter is reflected by the second reflector; the reflected beam passes through the focusing lens and the quarter-wave plate again, and arrives at the other modulation region of the spatial light modulator, and thereafter, passes through the second telescope system and the objective lens sequentially, and arrives at the sample stage. With the spatial light modulator-based dual-beam optical tweezers system of the invention adopted, the application range of the optical tweezers can be greatly extended, and experiment accuracy can be improved.

The invention provides an improved method for determining free chlorine ions in cement paste or mortar and belongs to the technical field of determination of building materials. The improved method comprises the following steps: preparing a sodium chloride standard solution and a silver nitrate solution with the concentration of c; grinding the mortar in concrete until all the mortar passes through a square hole sieve with the hole diameter of 0.63mm; drying the mortar at 105+/-5 DEG C for 2 hours and recording the weight as G; adding de-ionized water; shaking and immersing; filtering and adding nitric acid into a filtering solution; inserting electrodes; connecting the two electrodes with a potentiometer; titrating by using the silver nitrate solution; recording potentials and readings of a corresponding burette; recording the volume V of silver nitrate corresponding to a titrating final point; calculating the content of the free chlorine ions in a cement slurry system according to a formula as shown in the specification; if the difference of titrating results of two times is less than 1%, finally obtaining an average value; if the difference of the titrating results of the two times is more than 1%, continuing to titrate until the difference of the titrating results of the two times is less than 1%. According to the method, the titrating final point is obvious and the accuracy is high; an experiment process is simple and convenient and is suitable for large-batch tests.

The invention provides a forced ship model rolling experiment device which comprises a fixing device, a control and drive device and a data acquisition device. The fixing device comprises a base plate and a frame installed on the base plate and further comprises a crank guide rail moving device and a connection rod driving device. The crank guide rail moving device comprises a horizontal guide rail I, a horizontal guide rail II, a slide block I, a slide block II, vertical guide rails fixedly connected with the two slide blocks, vertical slide blocks matched with the vertical guide rails and cranks connected with the vertical slide blocks, wherein the horizontal guide rail I and the horizontal guide rail II are installed on linear guide rail supports, the slide block I and the slide block II are matched with the horizontal guide rail I and the horizontal guide rail II, and the middle positions of the cranks are connected with the control and drive device. The connection rod driving device comprises a push rod and a connection rod, wherein one end of the push rod is connected with the slide block I, the other end of the push rod is connected with the connection rod, and the lower end of the connection rod is connected with the data acquisition device. The forced ship model rolling experiment device is simple in structure, convenient to operate and easy to process and manufacture and used for experimental study of ship rolling hydraulic performance.

The present invention provides a germanium-silicon heterojunction transistor single event effect test method based on heavy ion microbeam irradiation. The problems are mainly solved that a damaging mechanism cannot be directly represented and a sensitive region cannot be accurately located in the prior art. The implementation scheme of the method comprises the steps of: selecting a germanium-silicon heterojunction transistor sample to test electrical properties of the germanium-silicon heterojunction transistor sample; making and testing a PCB test board for irradiation, and performing de-encapsulation processing of a germanium-silicon heterojunction transistor device prior to test; assembling an irradiation platform; setting a test condition of a heavy ion microbeam irradiation test; performing beam ejecting position location of a heavy ion microbeam irradiation device; setting the type and the weight of incident heavy ions; developing the heavy ion microbeam irradiation test; and recoding and processing all the test data, and obtaining a single event effect sensitive region. The method provided by the invention can accurately locate the germanium-silicon heterojunction transistorsingle event effect sensitive region, can improve the experiment precision, can reduce the test cost and can be used for assessment of the astronavigation anti-radiation capacity for microelectronicdevices.

The invention discloses an online-sampling hydrothermal system hydrocarbon source rock-to-hydrocarbon thermal simulation experiment apparatus. The apparatus comprises a reaction vessel, a thermocouple, a heater, a sampling device, a reaction solution injection device, and a controller for controlling the temperature, the pressure and the motion execution of the experiment apparatus. The temperature and the pressure can be constantly controlled through controlling the motion executions of all parts by the controller in the reaction process of substances in the reaction vessel in order to satisfy requirements of the reaction dynamics; the sampling device can sample and analyze a gas and a solution obtained after the reaction in order to realize the continuous sampling and online analysis in the experiment process, and the experiment precision and the analysis efficiency are high; and the reaction vessel has a large volume in order to avoid large influences of the take-out a small amount of a sample in the reaction process to the temperature, the pressure and the chemical components of a whole reaction system.

The invention discloses a device for measuring actual triaxial creep of a geotechnical engineering test specimen. The device comprises a support structure, and also comprises four confining pressure plates, an upper compression plate and a lower compression plate so as to form a closed cavity for wrapping a test specimen, wherein the confining pressure plates comprise two long confining pressure plates and two short confining pressure plats, the upper compression plate and the lower compression plate are a rectangular top steel plate and a rectangular bottom steel plate, the two outwards-bent L-shaped long confining pressure plates are overlapped on two adjacent side surfaces of the bottom steel plate, the two outwards-bent L-shaped short confining pressure plates are overlapped on the other two side surfaces of the bottom steel plate, the bottom ends of the short of the bottom steel plate plates are arranged on the bottom steel plate, the top steel plate is overlapped at the top ends of the long confining pressure plates, the top steel plate is clung to the inner side surfaces of the two short confining pressure plates, pressure sensors corresponding to the four confining pressure plates and the upper compression plate and the lower compression plate are vertically arranged inside the support structure, and grating rulers are arranged on the pressure sensors. The invention also provides a method for measuring the actual triaxial creep of the geotechnical engineering test specimen by using the device.

An engine exhaust catalyzed purifier activity evaluation system comprises a gas distribution subsystem, a temperature control subsystem, a reaction subsystem, a gas analysis subsystem, and a data acquisition and control subsystem. An output end of the gas distribution subsystem is connected with the reaction subsystem, the gas analysis system, the temperature control system and the reaction subsystem respectively. The reaction subsystem is connected with the gas analysis subsystem. The data acquisition and control subsystem is connected with the gas distribution subsystem, the reaction subsystem, the temperature control subsystem and the gas analysis subsystem. As a high-precision flow controller is used to collocate a simulated exhaust gas as a gas source, the catalyst can carry out an activity evaluation experiment in the artificially-controllable atmosphere. The system is provided with the stable gas source, the good repeatability, the high automation, and the precise temperature control, and can realize the flexible control of different temperature rising speeds at a plurality of sections. An exhaust analyzer can measure the concentration of gas in the front or back of the catalyst. The system is provided with the function of ignition temperature characteristic experiment, air-fuel ratio characteristic experiment and air-speed characteristic experiment simultaneously or respectively.

The invention provides a method for improving the precision of a right angle cutting experiment of a carbon fiber composite material, belongs to the field of cutting of hardworking materials and relates to the method for improving the precision of the right angle cutting experiment of the carbon fiber composite material. According to the method, a carbon fiber composite material sample is fixed to a rotor of a linear motor, the rotor carries the sample to preprocess the sample through a three-axis grinder, a damaged area below the initial area of the sample is removed, and the surface, to be machined, of the sample has high flatness; an ultra-field-depth microscopic device is used for accurate tool setting, the practical cutting depth is accurately measured and adjusted so that it can be ensured that the practical cutting depth is equal to the preset value of the experiment, and the precision of the right-angle cutting experiment is improved. According to the method, due to building of an experiment device and experiment setting, the grinder is used for preprocessing, and the experiment is completed through the steps of microscopic tool setting, right angle cutting experiment conducting and the like. The device related to the method is simple, easy to operate and capable of effectively improving the experiment precision of the right angle cutting experiment of the carbon fiber composite material.

The invention provides a whole body exposure system for animals. The whole body exposure system comprises a whole body exposure chamber, an aerosol generation system, a sampling system, a waste gas recycling and treating system and a control system; the whole body exposure chamber is used for placement of animals for toxicity experiment; the aerosol generation system is communicated with the whole body exposure chamber and used for generating aerosol for inhalation toxicity experiment; the sampling system is used for collecting concentration of the aerosol in the whole body exposure chamber; the waste gas recycling and treating system is communicated with the whole body exposure chamber and used for recycling and treating waste gas generated by the animals and excessive aerosol; the control system is used for regulating the concentration of the aerosol in the whole body exposure chamber in the experiment process. The concentration of the aerosol in the whole body exposure chamber is detected through the control system and the sampling system, automatic control of the whole body exposure system is realized, accurate control on the concentration of the aerosol in the whole body exposure chamber is realized, and requirements of experiments are met. The whole body exposure system with the automatic control system is high in automation degree and experiment accuracy.

The invention provides a fatigue test device for an equal-thickness pavement structure on the basis of MTS. The fatigue test device comprises a subgrade and pavement model and an MTS loading device, and is characterized in that a loading head is fixed at the lower end of an MTS acting head; the lower surface of the loading head is arc-shaped; a rubber layer which is consistent to a tire of an automobile is fixed on the loading head; the MTS acting head applies an acting force with corresponding frequency and load to the subgrade and pavement model; and a sensor is arranged in the subgrade and pavement model. A fatigue test method comprises the following steps of (a) constructing the subgrade and pavement model; (b) hoisting a model case; (c) mounting the MTS acting head; (d) connecting the loading head; (e) setting a loading model; (f) acquiring data; (g) stopping loading; (h) continuing testing; and (i) analyzing data. Compared with special accelerating and loading equipment, the fatigue testing device and the fatigue testing method have the advantages of low cost, short loading period, reasonable test data and low test cost, have obvious beneficial effects, and are convenient to popularize and use.

The present invention relates to a lens-less Foucault method wherein a transmission electron microscope objective lens (5) is turned off, an electron beam crossover (11, 13) is matched with a selected area aperture (65), and the focal distance of a first imaging lens (61) can be changed to enable switching between a sample image observation mode and a sample diffraction pattern observation mode, characterized in that a deflector (81) is disposed in a stage following the first imaging lens (61), and conditions for an irradiating optical system (4) can be fixed after conditions for the imaging optical system have been determined. This allows a lens-less Foucault method to be implemented in a common general-use transmission electron microscope with no magnetic shielding lens equipped, without burdening the operator.

The invention discloses a device for simulating natural gas hydrate row type horizontal well seawater injection mining, and relates to the field of natural gas hydrate development. The device comprises an air supply system, a liquid supply system, a simulation system, a fracturing system, a seawater injection system, a production system and a monitoring system, the device adopts a sand filling box to serve as a main body of the simulating system, a row type horizontal well pattern can be simulated, and by means of the air supply system and the liquid supply system, natural gas and water are supplied into the simulation system to form a natural gas hydrate; fracturing operation is implemented through the fracturing system for simulating natural gas hydrate storage, seawater is injected through the seawater injection system to simulate seawater injection mining, associated gas and water are collected through the production system, and the whole experimental process is monitored through the monitoring system. Accordingly, an experimental device adopts a three-dimensional mode, the seawater injection mining natural gas hydrate is simulated, and a certain guiding effect on natural gas hydrate seawater injection mining mechanism study is achieved.

The invention relates to a method for generating extreme waves at specified positions in an experimental water tank and belongs to the technical field of ocean engineering and hydrodynamic experimental research. The method comprises steps of: determining a wave parameter according to a water tank parameter in a laboratory, generating a wave-generating signal, inputting the wave-generating signal into a wave-generating system for initial wave making, determining whether the waves are broken, and changing the wave amplitude and the spectrum width constituting the waves if so in order to re-determine the wave parameter; if not, calculating the phase deviation at a focus position by using all-phase Fourier transform, correcting the wave-generating signal by using a phase difference, generating waves by a wave generator, determining whether the phase adjustment at the focus position converges, and recalculating the phase deviation at the focus position if not; if so, generating the extreme waves at the specified positions. The method flexibly controls the effect position of the extreme waves and a structure model in the water tank and precisely generates extreme waves in different forms at designated positions of the water tank, thereby improving experimental efficiency and precision.