180results about How to "Optimize experimental conditions" patented technology

The invention discloses a method for extracting various active ingredients from dendrobium officinale. The method comprises the following steps of: carrying out flash-extracting; centrifuging the flash-extracted crude extracting solution; carrying out alcohol precipitation and tertiary dehydration to the centrifuged liquid supernatant to obtain free polysaccharide; combining the centrifuged precipitates with polysaccharide and alkaloid extract; and extracting the various active ingredients from the dendrobium officinale, so that the comprehensive utilization of the dendrobium officinale resources is realized. The method disclosed by the invention is high in yield, capable of greatly shortening the extraction time during the extraction process, capable of avoiding the influences of thermal destruction to the products, capable of reducing the production cost and applicable to large-scale production.

The invention discloses a kit and method for staphylococcus aureus CRISPR locus detection. The kit comprises three pairs of specific primers designed according to three CRISPR locus gene sequences of staphylococcus aureus. The invention further discloses the method for staphylococcus aureus CRISPR locus detection. The three pairs of specific primers are utilized to amplify corresponding CRISPR fragments from sample genome DNAs. The kit and the detection method are simple to operate, high in sensitivity and specificity and low in detection cost and have good popularization and application values.

The invention relates to the field of battery manufacturing and energy source storage and particularly provides a preparation method of a thermally-reduced graphene oxide / nano carbon fiber composite electrode for a full-vanadium flow battery. The preparation method comprises the following steps: firstly, preparing a spinning solution for an experiment; secondly, uniformly mixing graphite oxide powder and the spinning solution; stripping the graphite oxide powder into graphene oxide by using an ultrasonic manner; preparing a nano fiber membrane by adopting an electrostatic spinning method; and then pre-oxidizing the nano fiber membrane in the air and carbonizing in an inert atmosphere pipe type furnace to obtain the needed thermally-reduced graphene oxide / nano carbon fiber composite electrode. According to the full-vanadium flow battery composite electrode prepared by the method, the diameter of carbon fibers is a nano scale; and the carbon fibers are compounded with thermally-reduced graphene oxide and the roughness of the fibers is greatly increased, so that the specific surface area of the electrode is two orders of magnitudes higher than that of a traditionally-used electrode material. Meanwhile, the high-activity thermally-reduced graphene oxide is adopted so that the electrochemical activity of the electrode is improved.

The invention relates to the field of battery manufacturing and energy storage, in particular to a preparation method of a bismuth-base catalyst / carbon nanofiber combination electrode for an all-vanadium redox flow battery. Firstly, spinning solution required for an experiment is prepared and then bismuth salt and the spinning solution are uniformly mixed. According to an electrostatic spinning method, a required nanofiber film is prepared and then the nanofiber film is pre-oxidized in the air and is carbonized in an inert atmosphere tube furnace so as to obtain the required bismuth-base electrocatalyst / carbon nanofiber combination electrode. After the obtained electrode material is cleaned and dried, testing of related electrochemical performance representation and charge-discharge properties can be carried out on the electrode material. The carbon fiber diameter, which is prepared according to the preparation method, is in the nano class; compared with a specific surface area of a conventionally used electrode material, the specific surface area of the bismuth-base catalyst / carbon nanofiber combination electrode is greatly increased. Moreover, the carbon nanofibers are compounded with a high-activity bismuth-base electrocatalyst, and thus, electrochemical activity of the electrode can be greatly improved, so that energy efficiency of the all-vanadium redox flow battery is greatly improved.

The invention discloses a system and a method for sensing emotion of juvenile environmental psychology based on electroencephalogram, and a method for selecting simulation samples. The system comprises an electroencephalogram signal acquisition module, an electroencephalogram signal preprocessing module, an electroencephalogram signal feature extraction module, an emotion sensing module and the like; and a built environment serves as a visual simulation source, wherein juveniles often contact with, participate in or are crazy about the built environment. The emotion sensing method comprises the steps of selecting the visual simulation source, acquiring the electroencephalogram signal, preprocessing the electroencephalogram signal, extracting electroencephalogram signal features, training a model, determining emotion intensity and the like. According to the method for selecting the simulation samples, arousal dimensionality and valence dimensionality are divided according to 5 emotion intensities, and rectangular select boxes are determined non-equidistantly according to the actual selected condition of the samples and the distribution state of the samples in a two-dimensional space. The emotion sensing system, the emotion sensing method and the method for selecting the simulation samples have the advantages of high emotion sensing ability, object extending ability and the like, and have high application values in environmental psychology research.

The invention discloses a natural gas hydrate sediment triaxial test device, and belongs to the field of testing the mechanical properties of natural gas hydrate sediment. The device comprises a triaxial test device main machine, a temperature control system, a pore pressure control system, a confining pressure control system and a computer data acquisition and control system. The triaxial test device main machine, which is in a dual-pressure-chamber structure, can be used for accurately measuring volume change in the sediment in a natural gas hydrate decomposing process; a load sensor is arranged inside the pressure chamber and is capable of improving the precision of intensity data; a pre-cooling hollow cavity is formed inside a base to pre-cool pore gas and pore water which enter a sample, so as to relieve the decomposition of the natural gas hydrate in a saturated water process and to improve the precision of temperature control; in a sample installation process, a quick coupling is adopted for connection, so that the operation is convenient and rapid. The device can simulate the natural gas hydrate decomposing process under mining conditions, so as to achieve the high-precision temperature control, and accurate measurement of intensity and volume change; and the device has great significances for understanding the mechanical properties of the natural gas hydrate sediment and assessing the stability of a reservoir.

The invention discloses a nucleic acid amplification testing microfluidic chip and a detection method. The nucleic acid amplification testing microfluidic chip comprises a chip body, wherein the chipbody is provided with a sample feeding opening, an amplification reaction chamber, a diluting solution chamber, an immunochromatography chamber and a sealing plug, wherein a first soft membrane valveis arranged between the amplification reaction chamber and the diluting solution chamber; a second soft membrane valve is arranged between the amplification reaction chamber and the immunochromatography chamber; the diluting solution chamber is communicated with the amplification reaction chamber through the first soft membrane valve; the amplification reaction chamber is communicated with the immunochromatography chamber through the second soft membrane valve and a second flow channel; meanwhile, the amplification reaction chamber is communicated with the sample feeding opening. The soft membrane valves are used for blocking microfluidic and each chamber; meanwhile, the soft membrane valves can be broken by utilizing a mechanical force and then liquid mixing and reaction are carried out;nucleic acid amplification and immunochromatography technologies are designed on one microfluidic chip, so that the specificity and sensitivity of a nucleic acid diagnosis reagent are increased; complicated instruments used in a nucleic acid diagnosis process are reduced and the whole chip is completely sealed; pollution, caused by a nucleic acid amplification reagent, on the environment is effectively prevented.

The invention provides a device for detecting, analyzing and processing reward operation condition reflection in real time. The device comprises a computer system and an experiment box, wherein the computer system comprises a computer host, a PCI (programmable communications interface) / CAN (controller area network) card, a graphic card, a display and an experiment control module; the graphic card is used for receiving video signals of a camera and transmitting the video signals to the computer host for processing; the display is connected with the computer host and is used for displaying experiment data; and the experiment control module is used for setting a reward experiment mode and parameters, receiving and processing the video signals and counting, recording and displaying the experiment data. With the adoption of the device for detecting, analyzing and processing the reward operation condition reflection in real time, various best experiment conditions are set according to experiment purposes; the experiment data and statistic analysis can be automatically given; the interference of external light sources on the experiment can be avoided; and the repeatability of the experiment is guaranteed.

The invention belongs to the technical field of ceramic powder preparation, and particularly relates to a preparation method of high-dispersion nano-zirconia powder. According to the method, doped yttrium metal modification, preparation of a precursor by a co-precipitation method and hydrothermal crystallization are combined to obtain the high-purity and high-dispersion nano-zirconia powder, impurity ions in the precursor are removed by an ultra-filtration composite membrane technique, crystal form control and particle dispersion functions of a mineralizer are more effectively achieved in hydrothermal reaction, the concentration of the nano-zirconia powder in the precursor is improved, and high-purity and high-yield nano-powder is prepared. The nano-zirconia powder with stable yttrium prepared by the method has a spherical particle shape, is narrow in particle size distribution, good in dispersibility, high in purity, free from aggregation and the like and can be widely applied to high-end biological ceramic materials, and the method solves the problem of brittleness of a current zirconia material in the transition process of crystal forms, so that zirconia ceramics are flexibly and widely applied.

The invention discloses a fluorescent probe for dopamine determination. The fluorescent probe for the dopamine determination is characterized in that with L-arginine as a carbon source, one-step synthesis of carbon quantum dots with strong fluorescence emission is achieved through a hydrothermal method; the carbon quantum dots are characterized by such things as ultraviolet absorption spectrum (UV), fluorescence spectrum (PL), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), and fluorescent properties of the synthetic carbon quantum dots and the fact that the surface of the same contains a large number of functional groups such as hydroxyl groups and carbonyl groups are confirmed; according to the fluorescence quenching effect of dopamine on C-dots(carbon dots), the C-dots are used as a fluorescent probe for detecting the dopamine, and experimental conditions such as pH (hydrogen ion concentration), carbon point usage, reaction temperature andtime are optimized; a quantitative detection method for the dopamine is established under the optimal detection conditions, and the detection limit is as low as 93 nanometers, which proves that the method can be used for sensitive detection of dopamine in actual samples.

This invention puts forward a design plan for wetting technology and system used in test platforms of large power fuel cells, which puts forward a heat-exchange system of two stages or multiple stages to transfer heat generated by fuel cells to reactant gas entering into the fuel cell, in order to increase the gas / liquid medium-transfer ability of the wet system, a high efficient filled converse flow spray tower is taken as a main wetting device and temperature of a spray medium is controlled accurately to guarantee temperature of wetting and saturation of vapor, which can control the relative humidity of the reactant gas entering into a fuel cell stack within +-2% and relative temperature in +-0.1deg.C by controlling the temperature of an overheater with an outer heater and efficient heat-transmitting filling component accurately, and a foam-removing system with accurate temperature control is matched to avoid liquid from entering into the back system.

The invention discloses a universal and efficient material surface modification method which comprises the following steps: 1) preparing a dopamine solution; 2) treating a substrate surface, washing, and preserving for later use; drying a substrate material in a blowing manner before being used; putting a substrate into the dopamine solution, and drying in the blowing manner for later use; 3) grafting a PEI (Polyethyleneimine) layer on the basis of a dopamine coating, preparing a Tris*HCl solution, and sealing for preservation; preparing a polyethyleneimine (PEI) solution for later use; putting the substrate coated by a PDA layer into the polyethyleneimine (PEI) solution, sealing the opening with a preservative film, stirring at room temperature for reaction, grafting the polyethyleneimine (PEI) layer, performing reaction, taking out by using tweezers, and blowing for later use; 4) inoculating an activated initiator; 5) performing surface initiation polymerization, immobilizing the initiator on surfaces of different substrates, and preparing different types of polymer brushes on the surfaces of different substrates by using a surface initiation polymerization method. The method has the advantages of being gentle and universal.

The invention discloses an experiment device for simulating natural firing in a goaf and a test method. The experiment device is characterized in that an experiment furnace body is provided with a coal outlet, an air intake pipe and an air return pipe; a coal bed, a similar material bottom plate, a preset water bag, a to-be-settled similar material bottom plate, a first similar material top plateand a second similar material top plate are arranged in the experiment furnace body; multiple-point thermocouple testing rods and an air intake bundle pipe are arranged above the second similar material top plate; a covering layer is arranged between the multiple-point thermocouple testing rods; a plurality of thermocouples are arranged on the multiple-point thermocouple testing rods; the multiple-point thermocouple testing rods and the air intake bundle pipe are in tight contact with a similar material; both ends of a coal mining work face on the coal bed are provided with an air intake tunnel and an air return tunnel, an arch-shaped hollow protecting pipe is paved among the air intake tunnel, the coal mining work face and the air return tunnel, and a certain passage space is formed on asupport coal body, so as to build an air intake and return system for the goaf and the work face. The experiment device has the beneficial effect that the whole process of coal natural firing in the goaf under the air leakage condition can be accurately and effectively simulated in the laboratory.

The thermal analysis method for content of silicane mixture comprises: in inertial gas, heating as 10Deg / min till 550Deg and holding for 60min; then, changing into oxygen at 650Deg and holding 60min; obtaining the initial mass M0 and M1 at 105Deg, calculating the content for the low-boil as (M1-M0) / M0*100%, the silicane coupling agent as (M2-M1) / M0*100%, with the final mass M3, the carbon black content as (M3-M2) / M0*100%, and final residual content as M3 / M0*100%. This invention has well accuracy and sensitivity.

A vibration control experiment platform for an aero-engine comprises the components of an experiment platform base, an aero-engine body, a driving system, a testing control system and a security protecting device. A first driving motor of the driving system transmits a power to a low-pressure rotor system of the aero-engine body. A second driving motor transmits the power to a high-pressure rotor system of the aero-engine body through a second coupling and an accessory transmission system of the aero-engine body. A motor output shaft, the low-pressure rotor system and the high-pressure rotor system are provided with capacitive displacement sensors. A second-stage case, a third-stage case, a six-stage case, a combustion chamber case and a high-pressure turbo case which correspond with five supporting bearings of the aero-engine are provided with three-dimensional vibration acceleration sensors. The vibration control experiment platform can be used testing and analyzing a multi-factor coupled vibration problem of the aero-engine. The vibration control experiment platform can be widely used for researching vibration characteristic and vibration control strategy of an aero-engine double-rotor system.

The invention discloses a preparation method of a copper-zinc-tin film material. The preparation method comprises the following steps: (1) the copper-zinc-tin film material comprises at least three main metal elements of copper, zinc and tin; electroplate liquid contains any two main metal elements; and additive solution contains a third main metal element; (2) at least one conducting electrode serves as a first electrode in the electroplate liquid; and a film substrate to be plated serves as a second electrode; (3) when electricity is conducted between the first electrode and the second electrode, and the speed is controlled to add the additive solution, that is, films containing three metals of copper, zinc and tin are synchronously deposited to obtain a substrate deposited with the copper-zinc-tin metal film on the surface; and the copper-zinc-tin film material is obtained. In the preparation method of a copper-zinc-tin sulfenyl solar battery, a cadmium sulfide buffer layer, a ZnO film and an ITO film or an AZO film are deposited on the copper-zinc-tin film material in sequence to obtain the copper-zinc-tin sulfenyl solar battery after the step (4).

The invention relates to the field of battery manufacturing and energy source storage, in particular to a preparation method of a nano graphite powder / carbon nanofiber composite electrode for an all-vanadium redox flow battery. Firstly, a spinning solution required by an experiment is prepared, and then nano graphite powder with different particle sizes and the spinning solution are uniformly mixed. By an electrospinning technology, a required nanofiber membrane is prepared, and then is pre-oxidized in the air and is carbonized in an inert atmosphere tubular atmosphere furnace to obtain a required nano graphite powder / carbon nanofiber composite electrode. According to the all-vanadium redox flow battery composite electrode prepared by the method provided by the invention, the carbon fiber diameter is at the nanoscale, and the carbon fiber is compounded with nano graphite powder with high electrical conductivity, so that the roughness of the fiber is substantially increased, and thus the specific surface area of the electrode is two orders of magnitude larger than that of the conventionally used electrode material. Meanwhile, the high-activity nano graphite powder enables the electrochemical activity of the electrode to be improved, so that the energy efficiency of the all-vanadium redox flow battery is greatly improved.

The invention discloses an automatic standing wave experiment instrument, which is characterized in that a loudspeaker is arranged on one end in a transparent round pipe and is connected with an audio signal generator assembled outside, and the other end of the transparent round pipe can reflect sound waves to form standing waves. A microphone driving device driven by a drive motor is arranged in the transparent round pipe, a standing wave experiment microphone is connected with a microphone signal amplifier, the microphone signal amplifier is connected with an output socket, the drive motor is driven by controlling a forward or backward rotating switch and a singlechip keyboard to change the position of the microphone, and thus, the automatic standing wave experiment instrument can quickly and exactly find the positions of nodes or loops of standing waves to measure parameters or sound velocity of sound standing waves under different air pressures. The automatic standing wave experiment instrument solves the problem that traditional sound velocity measuring instruments do not have functions of automatic adjustment, intelligent adjustment and intelligent reading, and cannot be used for performing experiments about relationship between sound velocity and air pressure. The automatic standing wave experiment instrument can be used for performing sound velocity measuring experiments or physics demonstration experiments in colleges.

The invention relates to the field of battery manufacturing and energy source storage and particularly provides a preparation method of a tungsten-based catalyst / nano carbon fiber composite electrode for a full-vanadium flow battery. The preparation method comprises the following steps: preparing a spinning solution for an experiment; uniformly mixing a tungsten salt with the spinning solution; preparing a nano fiber membrane by adopting an electrostatic spinning method; and pre-oxidizing the nano fiber membrane in air and carbonizing in an inert atmosphere pipe type furnace to obtain the needed tungsten-based catalyst / nano carbon fiber composite electrode. After the obtained electrode material is washed and dried, related electrochemical performance characterization and charging and discharging performance tests can be carried out on the electrode material. According to the prepared tungsten-based catalyst / nano carbon fiber composite electrode for the full-vanadium flow battery, the diameter of carbon fibers is nano-grade; and compared with a traditionally-used electrode material, the specific surface area is greatly enlarged. Nano carbon fibers are compounded with a high-activity tungsten-based catalyst, and the electrochemical activity of an electrode is greatly improved, so that the energy efficiency of the full-vanadium flow battery is extremely improved.

The present invention is a detection method and detecting system for the rodent sports ability, which is characterized in that the detecting system comprises an experimental box made by a metal grid bottom plate and an organic glass plate, a video camera, a computer, a computer system and detecting software. Through the video camera arranged outside the experimental box, the rodent is placed in the experimental box and the rodent is able to walk on the metal grid bottom plate. Number that the rodent fall from the metal grid bottom plate of the experimental box is counted. Therefore damage degree of the rodent sports ability is reflected. Image data of the rodent walking process is input into the computer through the video camera. The detecting software of the computer can perform the automatic identification, detection, analysis and record. The present invention improves experimental condition and provides an urgently required detection method and detecting system in the field for a long period. The present invention possesses advantages of high degree in automatic control and detection, accurate record, reliable detecting data.

The invention discloses an optical anti-counterfeiting device based on nanocrystal cellulose. The optical anti-counterfeiting device based on the nanocrystal cellulose comprises a nanocrystal cellulose film adhering to a double-sided adhesive film. A preparation method of the optical anti-counterfeiting device comprises the steps that first, a bleached fibrous material and sulfuric acid with the concentration of 64wt% are stirred at 45 DEG C for 90 min to 120 min for hydrolytic acidification, and ten-fold deionized water is added to terminate the reaction; second, centrifugal separation is carried out, concentrated suspension at the bottom is collected, the suspension is dialyzed through a dialysis membrane with the molecular weight ranging from 12000 dalton to 14000 dalton till the solution pH is equal to seven, the dialyzed suspension is made into a colloidal solution with the weight concentration ranging from 0.5wt% to 8wt% through ultrasonic dispersion; third, a fluorescent brightener is added in the colloidal solution, the mixture is evenly mixed, and the concentration of the fluorescent brightener ranges from 50 ppm to 150 ppm; fourth, the obtained colloidal solution is placed on a polystyrene petri dish and aired at room temperature so that the nanocrystal cellulose film can be obtained, and the nanocrystal cellulose film is bonded to a double-sided adhesive tape base material. The optical anti-counterfeiting device has multiple complicated dominance and recessiveness anti-counterfeiting characteristics, on-site recognition can be carried out by a simple means, and the optical anti-counterfeiting device cannot be easily counterfeited by other people.

The invention discloses an industrial control network experimental platform based on filed buses and a control method thereof, and the experimental platform comprises an experimental terminal, a remote control terminal and a communication module. The experimental terminal comprises a programmable controller which controls the field buses to transmit variable information; and the remote control terminal is used for remotely controlling the experimental terminal. The communication module comprises field bus communication units of at least two types and a field bus protocol conversion module; and the field bus protocol conversion module is arranged between the field bus communication units which are connected in series and is used for converting a data packet which can be transmitted by one bus communication unit to a data packet which can be transmitted by other bus communication units. Protocol conversion of various field buses can be realized by the field bus protocol conversion module, thus realizing data communication between two types of field buses; and information transmission among different field bus devices can be constructed in a laboratory, and students can get to know more kinds of field buses.

A resonant image of using color light to excite surface plasma type consists of light source, modulation unit of incoming light angle, sample analysis unit, temperature control unit, detection unit, data collection and management unit. It is featured as applying composite-color light as excitation light source, using total reflection media-coupling to excite surface plasma of sensing film and to resonate with excited surface plasma for generating color image correlating to property of test sample.

The invention relates to a scheme and a device, which realize the acquisition of rotation speed signals of a tested motor through a sensor, set the rotation speed signals to be in an identification range of a signal conditioning circuit, after conditioning the signals, transmit the signals into a computer through a data acquisition card, finish processing data through virtual instrument software in the computer, display digital values of a rotation speed, torque and output power obtained through analysis processing on a friendly human-computer interface of the computer and simultaneously record the digital values in corresponding files. The scheme and the device have the following advantages that: experimental conditions for direct current machine testing in the prior art are improved; the whole scheme has good repeatability and avoids personal errors; the device applying the scheme realizes the integration of experimental instruments, so that the integration cost of experimental and testing equipment is remarkably reduced and steps are remarkably reduced; and through proper extension, the scheme and the device can be widely applied to the experiment teaching of other subjects, and can realize the experiment teaching and scientific research of a network and greatly improve the practical efficiency of experimental environments.

The invention provides a biosensor based on Au-ZIF-8 / OMC mesoporous carbon and a preparation method thereof. The biosensor comprises a working electrode which comprises a glass carbon electrode (GCE),the surface of the detection end of the GCE is sequentially connected with nitrogen-hybridized mesoporous carbon (OMC) and a gold (Au) nanoparticle film which is formed by a metal organic frame ZIF-8loaded with gold (Au), in other words, the biosensor is Au-ZIF-8 / OMC / GCE. The biosensor has good adsorption and storage functions, detection performance of an electrode is improved greatly by combining with a mesoporous carbon material high in conductivity, and xanthine (Xa) can be detected efficiently.

The invention relates to an enzyme-linked immunoassay method for aflatoxin in tobacco and tobacco products, which is applicable to precise measurement of aflatoxin in tobacco leaf samples and cut tobacco samples. The method disclosed by the invention comprises the steps of pretreating samples, extracting aflatoxin in the samples, preparing standard working solution, optimizing a detection method, establishing an enzyme-linked immunoassay method and the like. By adopting the method, the content of aflatoxin in tobacco and tobacco products can be detected rapidly and accurately. The method has the advantages of simplicity in experimental operation, less nonspecific adsorption, few instrument and equipment investment, low measurement cost and accuracy and reliability in measurement result.

The invention discloses a weak blast-induced strain-type rock-burst site simulation test method. The method comprises the steps of digging a test branch cave and a monitoring branch cave in the maximum burial depth section of a deep-buried tunnel, determining a stress concentration region in surrounding rock of the monitoring branch cave by virtue of numerical simulation, drilling blast holes in the stress concentration region of the surrounding rock, filling the blast holes with explosives at the bottoms, simultaneously setting vibration and dynamic strain test holes, generating a weak blast to induce strain energy accumulated by rock masses of the stress concentration region to release to form a simulated rock blast, and carrying out dynamic strain and vibration testing on a dynamic effect of the rock burst during the test. According to the method, by analyzing actually measured vibration and dynamic strain data of the rock masses, the internal relation among the energy release speed, the magnitude of induced vibration and the rock burst intensity during the rock bursting is revealed, to facilitate the prediction, prevention and control of the rock bursting; and the method can be widely applied to the fields of hydraulic and hydropower engineering, traffic, mines, national strategic defense and deep basic physical experiments and has important significances in the prediction, prevention and control of the rock bursting and the guarantee of construction safety of underground cavities.

The invention discloses a steep dip analog simulation experimental platform. The experimental platform comprises a bearing device (1), a model rack (2) arranged in the bearing device (1), and a rotating device which drives the model rack (2) to rotate, wherein the bearing device (1) comprises an upper horizontal slideway (11) and a lower horizontal slideway (16) which are formed in parallel; the upper horizontal slideway (11) and the lower horizontal slideway (16) are fixedly connected by virtue of two vertical slideways (12) which are symmetrically formed; a first supporting seat (13) is arranged nearby the upper end of the vertical slideway (12) positioned on the left side; a second supporting seat (14) is arranged on the left side of the lower horizontal slideway (16). The experimental platform disclosed by the invention is simple in structure and ideal in simulation effect, constructs a set of steep dip coal seam analog simulation experimental platform and has a certain significance of perfecting theoretical research of steep dip coal seam mining and improving the experiment conditions.

A physicochemical experiment system based on virtual instrument control technique is composed of a temp controller on the basis of semiconductor refrigerating technique, a signal processing unit connected via 485 bus to said temp controller, computer and software control system.

The invention discloses a preparation method and application of a nitrogen-doped porous carbon fiber and belongs to the technical field of preparation of porous carbon fiber materials. The preparationmethod comprises the following steps of firstly, preparing a polyacrylonitrile / polyvinylpyrrolidone spinning precursor solution, then obtaining a porous polyacrylonitrile fiber through a wet spinningmethod by utilizing different solubilities (phase separation) of the polyacrylonitrile and the polyvinylpyrrolidone in an aqueous solution, soaking and activating the obtained porous polyacrylonitrile fiber in a potassium hydroxide solution, taking the polyacrylonitrile as a carbon source and a nitrogen source, and carrying out one-step high-temperature carbonization activation treatment in an inert atmosphere to obtain the nitrogen-doped porous carbon fiber. The porous carbon fiber material has a hierarchical porous carbon skeleton structure with high specific surface area, high nitrogen content and mutual crosslinking, a fast channel is provided for electron transmission, the ion diffusion distance is shortened, the wettability and conductivity of the material are increased, and good electrochemical performance is shown. The preparation process is simple, the equipment dependence is low, and the method is suitable for large-scale industrial production.