181results about How to "Avoid affecting the experimental results" patented technology

The invention discloses a supercritical carbon dioxide fracture-creepage-seepage test device for high-temperature high-pressure coal petrography. The device comprises a triaxial cell, a supercriticalcarbon dioxide generator system, an axle load and confining pressure loading system, an acoustic emission monitoring system, a temperature rise control system, a deformation-pressure monitoring systemand a permeability measuring system. The device is capable of realizing the supercritical carbon dioxide fluid fracture test of coal petrography under high temperature and high pressure, monitoring and recording the temperature and pressure changes of supercritical carbon dioxide and characteristics of fracture cracking and extension in the supercritical carbon dioxide fracture process in real time, monitoring and recording the axial and radial deformations of coal petrography samples in real time, directly and effectively measuring the DH4 permeability of the coal petrography before and after the fracture without unloading the coal petrography sample stress, and measuring the CH4 permeability of the coal petrography after the fracture under the action of creepage. The measurement methodis high in precision, intuitional and high in automation degree, and the device is simple in structure.

The invention relates to a large mechanical test system for a combined adjustable constraint concrete arch frame. The system comprises a monitoring system, a hollow cylindrical counter force structure, a hydraulic loading device and an auxiliary loading device, wherein the monitoring system is used for monitoring and collecting arch frame parameters and data. The inner cylindrical surface of the counter force structure is provided with multiple oil cylinder positioning holes, the hydraulic loading device is disposed in the oil cylinder positioning holes, the hydraulic loading device comprises a hydraulic oil cylinder arranged in the oil cylinder positioning holes, a force transmission dispersion device connected with the hydraulic oil cylinder and a control system, and the hydraulic oil cylinder achieves loading through contact of the force transmission dispersion device and an arch frame to be tested. By means of the system, a 1:1 mechanical test can be carried out on the constraint concrete arch frame and other conventional arch frames, and tests of arch frames of different sizes and shapes can be achieved.

The invention discloses a full-automatic QuECHERS experimental device and an experimental method. The full-automatic QuECHERS experimental device comprises a multifunctional mechanical arm, a cap screwing module, a liquid adding module, a centrifugal module, a salt adding module, a ceramic proton homogenization module, a nitrogen blowing concentration module, a vortex uniform mixing module and anoscillation module, and can automatically complete sample transferring, addition of extraction liquid, extraction salt and ceramic homogenization protons, oscillation uniform mixing, centrifugal separation and vortex uniform mixing actions; A method adopting the full-automatic QuECHERS experimental device to carry out experiments mainly integrates the processes of sample liquid adding extraction,centrifugal separation, solid phase extraction and nitrogen blowing concentration, so that the time is saved, the manual operation is reduced, the automation is improved, and the errors are reduced.

The invention discloses a high temperature and high pressure coal rock supercritical carbon dioxide fracturing-creep deformation-seepage experimental method. A supercritical carbon dioxide fluid fracturing-creep deformation-seepage experiment of coal rock is executed under high temperature and high pressure, change of temperature and pressure of the supercritical carbon dioxide and fracture crackinitiation and expansion features in a supercritical carbon dioxide fluid fracturing process are monitored and recorded in real time, and axial deformation and radial deformation of a coal rock sampleare monitored and recorded in real time, moreover, CH4 permeability of the coal rock before and after fracturing can be measured directly and effectively under a condition where coal rock sample stress is not cancelled, and measurement of the permeability of the CH4 of the coal rock under the creep deformation function after fracturing can be realized. The measurement method provided by the invention is high precise, visual and highly automatic, and devices used in the method are simple in structure.

The invention provides a scalable multiple-proportion dilution microfluidic chip. The microfluidic chip is composed of a cover sheet and a substrate, the upper layer is the cover sheet provided with asquare wave micro flow channel network structure, the lower layer is the flat substrate, and the upper-layer cover sheet and the lower-layer substrate form a closed micro flow channel network throughbonding; two sample inlets and N sample outlets located in both ends of the micro flow channel are connected with soft guide pipes outside, wherein N is an integer >= 1, and N outlets represent a dilution level of a liquid sample to be diluted; a reagent sample to be diluted and a diluent in a micro-syringe are added into the sample inlets through a micro injection pump under a constant positivepressure, respectively, and the soft guide pipes at the sample outlets are connected with a collection device of a sample after multiple-proportion dilution to form the microfluidic chip; each sampleinlet is provided with one filter tank, and the interior of each filter tank is provided with a row of same rectangular stop blocks with a certain interval; each-level dilution module is composed of amixed flow channel and a connecting flow channel, and lengths of the mixed flow channel and the connecting channel are fixed; and rectangular baffles arranged in a staggered manner are arranged at the corner of the interior of the square wave mixed flow channel in each-level dilution zone.

The invention belongs to a positioning test fixture, and particularly relates to an automobile buckle insertion and extraction force and stress-strain test fixture. The test fixture comprises two parts including an insertion force fixture and an extraction force fixture corresponding to the insertion force fixture; the insertion force fixture comprises an insertion force fixture clamping block connected with a test machine, a first body, a second body, a third body, fixed sliding blocks and pressing circular plates; and the extraction force fixture comprises an extraction force fixture clamping block, an extraction force supporting assembly, a fixed baffle, a clamping device, a rotating knob and a clamping force adjusting round rod. The fixture is used during testing of stress-strain performance of an automobile buckle, and can clamp and position the buckle well during testing of the stress-strain of the automobile buckle, and slots in different models are formed in an H-shaped plate, so that buckles in various models can be tested. The test fixture is reasonable in structural design and convenient to operate; and the insertion and extraction force performance of plastic buckles can be tested accurately.

The invention relates to the technical field of ideal gas state equation research of high school physics, in particular to an experimental instrument for researching an ideal gas state equation and an operating method. The experimental instrument is characterized by consisting of an air cylinder, a thermometer and an air pressure gauge, the air cylinder consists of a square air cylinder body, an equal-pressure piston and a positioning-adjusting piston, the air pressure gauge and the thermometer are arranged inside the square air cylinder body, the lower-end sensing portion of the air pressure gauge extends into the square air cylinder body, the upper-end reading display portion extends out of the square air cylinder body to achieve monitoring and recording of an air pressure value, the lower-end sensing portion of the thermometer extends into the square air cylinder body, and the upper-end reading display portion extends out of the square air cylinder body to achieve monitoring and recording of a temperature value. Due to the fact that a control variable method is applied on the same device to control the isothermal, isasteric and isobaric processes respectively, three gas experiment laws are respectively inspected to obtain a conclusion and draw p-V, p-T and V-T images, and the experimental instrument has the advantages of being accurate in variable control, facilitating mastering and understanding of students and the like.

The invention relates to a method for distinguishing natural colored cotton by virtue of the content of flavone in the colored cotton fibers, which belongs to the technical field of textiles. The method comprises the following steps: immersing crushed to-be-detected colored cotton fibers in an ethanol solution for 1h, and ultrasonically extracting the solution to obtain flavone extraction liquid; respectively placing the flavone extraction liquid into 6 measuring flasks of 25ml according to different volumes, respectively adding a NaNO2 solution, an Al(NO3)3 solution and a NaOH solution into the six measuring flasks to have color development reaction, and fixing the volume to 25ml by utilizing the ethanol solution; respectively testing the light absorbance value of the flavone extraction liquid after color development and volume fixation in the six measuring flasks by utilizing an ultraviolet spectrophotometer; calculating the content value of flavone in the detected colored cotton fibers according to the content value of flavone in a rutin reference sample, and determining the colored cotton as the dyed cotton if the content value of the flavone in the to-be-detected colored cotton fibers is 0.1411 to 0.2314 mg/ml; determining the colored cotton as the natural colored cotton if the content value of the flavone in the to-be-detected colored cotton fibers is 0.7623 to 0.9522 mg/ml.

The invention provides a device for rapidly aging and evaluating SCR catalyst powder. The device comprises a steel pipe with a size equal to a tail gas pipe, small sample reaction devices, a temperature sensor, a first NOx sensor and a second NOx sensor, wherein one end of the steel pipe is connected with a tail gas exhaust port, and a connecting device is arranged at the other end of the steel pipe; a main air outlet hole and small sample reaction device holes which are uniformly distributed around the main air outlet hole are formed in the connecting device; the small sample reaction devices are fixed in the small sample reaction device holes and are positioned in the steel pipe. According to the device disclosed by the invention, the defects of a fixed bed reactor and a simulated tail gas test system are overcome, the SCR catalyst can be subjected to rapid aging and preliminary evaluation by utilizing the tail gas of specified temperature provided by the simulated tail gas test system, and the problem that only the whole catalytic converter can be aged by the simulated tail gas test system is solved.

The invention discloses a heat exchange tube fixing device, belongs to the technical field of heat exchange tubes, and provides a heat exchange tube fixing device for a heat exchange tube impact wearexperimental device. The heat exchange tube fixing device comprises side plates, heat exchange tubes, shaft seats, central shafts and locking devices, wherein rectangular through grooves are formed ineach side plate, upper shaft seats and lower shaft seats are arranged in a sliding mode to be connected with the side plates, the height position of the heat exchange tubes is adjusted by adjusting the upper positions and the lower positions of the upper shaft seats and the lower shaft seats, the maximum line contact length between the two heat exchange tubes is guaranteed, and non-round gasketsare adopted, so that it is ensured that the pretightening force exerted by nuts is transmitted to the heat exchange tubes, the contact between every two corresponding gaskets can be avoided, and the heat exchange tube fixing device has the advantages of conveniently adjusting the horizontal height and not influencing experimental operation.

The invention discloses a constant-temperature type air-blowing drying oven which comprises a box body, wherein the box body is divided into a dehumidifying cavity and a drying cavity; an air runner is formed between the drying cavity and the inner wall of the box body; a control valve is arranged in the dehumidifying cavity; the control valve is connected with a temperature inductor, and is used for controlling an air release valve, an air inlet valve and a circulating valve in the dehumidifying cavity; a rotary shaft is arranged on the top of the drying cavity; a drive device is arranged on the rotary shaft; air distributing plates are arranged at the periphery of the drying cavity; and an induced draft fan is arranged on a dehumidifying tube, and the port of the induced draft fan is further connected with a wet gas purifying device which is a multi-layer net structure. The rotary shaft and the air distributing plates are additionally arranged on an existing drying oven gas circulating system to form a ventilating circulating system, so that temperature uniformity and good drying quality in a drying cavity are guaranteed; the gas in the cavity is clean, so that cross contamination is avoided; and the constant-temperature type air-blowing drying oven is high in drying rate, is good in drying quality, is high in heat utilization rate, is good in practicability and is worthy of being widely popularized.

The invention relates to a small microbial electrolysis cell and application thereof. The electrolysis cell includes a flange, electrodes, copper bars, a microbial electrolysis cell reactor, an aeration plate and a stirring bar. Tiny aeration holes are uniformly formed in the aeration plate to allow gas bubbles to uniformly enter an electrolyte during N2 charging, so that the phenomenon that sudden gas expansion during N2 charging leads to unstable aeration, corrosion of the copper bars by the solution, and influence on the experiment effect is avoided. The electrodes are inserted into electrode clamping grooves in the upper surface of the aeration plate, electrons are supplied by an external electric field, and a DO or pH probe regularly passes through a through hole in the flange and fixed in a probe clamping groove in the center of the aeration plate, so that the DO or pH value of a reaction system can be monitored in real time. The microbial electrolysis cell can achieve stable and efficient degradation of perchlorate in water bodies.

The invention discloses a rabbit spine curving device for an experiment. The rabbit spine curving device comprises a device support, a transmission mechanism and a curving mechanism. The device support comprises a long transverse beam group, a short transverse beam group, a vertical column group and a transmission mechanism installation plate. The transmission mechanism comprises a direct current motor, a synchronous belt group, a synchronous wheel group, a driving shaft, a ball lead screw and a lead screw sliding block. The curving mechanism comprises a curving mechanism installation plate, a curving mechanism support, a crank group and a retainer group. An optical code disk is configured on the direct current motor and used for recording walking positions of the lead screw sliding block. The transmission mechanism transforms the motor rotation into horizontal moving of the lead screw sliding block, and the curving mechanism transforms the horizontal moving of the lead screw sliding block into the curving motion of the curving crank group to drive the spine of an experimental rabbit to perform curving motions. The spine curving device can perform spine curve according to given curved angles. The experimental rabbit can keep a natural posture in the spine curving process, and experimenters can easily perform operation on the rabbit spine.

The invention relates to an apparatus simulating coughing of a real human being. The apparatus comprises a particulate matter generation system including a particulate matter generator, an evacuation solenoid valve, a dust-adding solenoid valve and a dust-adding time control relay, and a compressed air jet generating system including an air compressor, a pressure gauge, a pressure-regulating valve, a flow control valve, a jet control solenoid valve, a jet time-control relay and a cylinder, wherein an air outlet pipe of the jet control solenoid valve and a pipe led out from the dust-adding solenoid valve of the particulate matter generation system are parallelly connected and then are connected to a coughing jet pipeline. This apparatus simulates coughing characteristics of a real human being, and meets the real human being coughing speed and flow rate, Jet speed change and temperature are consistent with the parameters of a real human being. Starting and stopping can be controlled only through solenoid valves, and operation is simple and accurate. A high-frequency hot line wind-velocity indicator is employed to determine the changing rules of gas flow velocity of a jet outlet. Parameters can be accurately determined according to the speed and flow curve of a measurement result calibrating device.

The invention discloses an environment-friendly durable physical acceleration experiment device, relates to the technical field of physical experiment equipment, and mainly aims to solve the problem that an existing experiment device needs a worker to pull a trolley with hands and needs cooperation of multiple persons. The device comprises a base plate, an experiment table, weights, a traction rope, a trolley, a dotting timer and a paper tape, and a first buffer device is arranged on one side, far away from the dotting timer, of the upper surface of the experiment table; motors are arranged onthe front side wall and the rear side wall of the trolley; a gear is mounted on an output shaft of the motor; electric push rods are mounted on front and rear sides of the upper surface of the experiment table; and racks are installed at the ends of telescopic rods of the electric push rods on the two sides of the experiment table and are meshed with the gear, and a second buffer device is arranged right under the weights. According to the present invention, with the arrangement of the motors, the gear, the rack and the electric push rods, the trolley does not need to always be pulled with the hand, and the influence on the experiment result due to the error caused by the manual pulling of the trolley by the experimenter is avoided.

The invention relates to a fruit fly culture and dosage device for a laboratory, and belongs to the technical field of fruit fly experiment devices for the laboratory, which solves the technical problems of replacing of different culture bottles and the like in the fruit fly culture and dosage process of the prior art. The fruit fly culture and dosage device for the laboratory adopts the solutionthat an upper section and a middle section, as well as the middle section and a lower section are respectively connected by a threaded connecting opening; a bottle cork is arranged at the upper end surface of the upper section, a medicine liquor adding pipe penetrates through the bottle cork and is communicated with the upper section, and the middle part of the side wall of the upper section is provided with an anesthetic air inlet I; a culture medium is arranged at the bottom part of the lower section, and the middle part of the side wall of the lower section is provided with an anesthetic air inlet II; a screen plate is arranged at the threaded connecting port I, and a blocking plate is arranged at the threaded connecting port II; a handle is used for driving the blocking plate or the screen plate to rotate from the 9 o'clock position to the 12 o'clock position along the pointer circular rotary track by a rotary shaft. The fruit fly culture and dosage device has the advantages that the problem of requiring of multiple steps and different culture bottles in the fruit fly dosage process is solved, and the experiment device integrating multiple steps is provided.

The invention discloses equipment for high-purity water. The equipment comprises a base, wherein the left side of the upper surface of the base is fixedly connected with a filter tank; a filter screenand an activated carbon filter layer are arranged in the filter tank, and the filter screen is located above the activated carbon filter layer; the upper part of the left side surface of the filter tank is fixedly communicated with a water inlet pipe which is located above the filter screen; the right side of the upper surface of the base is fixedly connected with a distillation tank which is located on the right side of the filter tank. According to the equipment for the high-purity water, the filter tank is arranged, so that raw water can be filtered sufficiently and pollutants in the watercan be adsorbed effectively under the action of the filter screen and the activated carbon filter layer; an electric heating pipe can heat filtered water effectively to enable the water to be turnedinto steam; by means of a condensing cavity, the steam can be introduced into the condensing cavity and cooled to be reduced into water under the action of a cold air pipe and a lead-out pipe; the equipment is simple in structure and low in manufacture cost, and can fully meet the requirement of a laboratory for preparing the high-purity water.

The invention specifically provides a thermostatic water bath provided with a heating piece fixing device. The thermostatic water bath comprises a water bath casing (1) and a thermostatic heating tank (2), wherein iron stand accommodating grooves (3) are formed between the water bath casing (1) and the thermostatic heating tank (2), a telescopic iron stand (7) is arranged in each iron stand accommodating groove (3), two symmetrical clamping rings are arranged on the inner side wall of an opening of each iron stand accommodating groove (3), two buckles (8) matched with the clamping rings are arranged on the outer side wall of the bottom of each iron stand (7), a fixing clamp accommodating groove (4) is formed beside the thermostatic heating tank (2), and a fixing clamp (6) is arranged in the fixing clamp accommodating groove (4). The heating piece fixing device is mounted on the thermostatic water bath, the problems that experimental apparatuses such as test tubes, beakers and the like used in the experimental process are difficult to fix in the thermostatic heating process is solved, the condition that the experimental result is affected due to inclination of the experimental apparatuses such as test tubes, beakers and the like is prevented, and the risk caused by hot water to a person in the operation process is reduced.

The invention discloses an experimental device and experiment method for breaking rock by means of ultrasonic waves. The device is composed of an ultrasonic generator, a vibration system and a cooling system; the vibration system comprises a Langevin vibrator, a connecting piece and a fixing device; the cooling system includes a cooling cylinder, cooling liquid and a cooling groove; the connecting piece is fixed on the Langevin vibrator by a screw, the horizontal fixing device is installed on the wall of the cooling groove, and a rock sample is bonded to the lower end of the connecting piece through strong glue. The ultrasonic generator provides power to the Langevin vibrator and drives the Langevin vibrator to work, and after being converted by the Langevin vibrator, an input electrical signal stimulates the rock sample to vibrate so as to make the rock sample damaged and broken; after being electrified, the cooling system injects the cooling liquid in the cooling cylinder in a circulating mode to cooling the Langevin vibrator. By changing the size of the rock sample, the relationship of the rock breaking effect, ultrasonic power and ultrasonic frequency can be studied, the rock sample is connected with the Langevin vibrator through the connecting piece, the vibration transmission efficiency is high, the vibrator can be used repeatedly, and the service life is long.

The invention discloses a microfluidic plane gradient coil of a superconducting pulse nuclear magnetic resonance spectrometer, and a mounting bracket of the microfluidic plane gradient coil. The gradient coil comprises a first gradient coil circuit board, a second gradient coil circuit board, a ground terminal and a series coaxial line; the two gradient coil circuit boards are mounted in a gradient coil groove of the bracket in a mirror symmetry mode and mutually connected in series to constitute a surface double-flat-plate structure, and the plane of a flat plate is parallel to the directionof a main magnetic field; and the two gradient coil circuit boards each have three layers. The mounting bracket comprises a bracket body and an upper cover plate, and the bracket body comprises a topdisc, a bottom disc and a connecting seat for connecting the top disc with the bottom disc. The microfluidic plane gradient coil is simple in structure, small in resistance value, high in efficiency and good in heat dissipation, and the mounting bracket can provide the sufficient microfluidic space to be matched with the gradient coil.

The invention belongs to the technical field of plant physiology experiment, and discloses a device for culturing plant experimental materials. The device for culturing the plant experimental materials comprises an upper shell and a lower shell, wherein a culture medium is arranged in the shell. The device for culturing the plant experimental materials further comprises a water and liquid feedingmechanism, a carbon dioxide and oxygen releasing mechanism, an illumination regulating mechanism, a temperature regulating mechanism and a controller. A water and liquid feeding experiment, a carbon dioxide and oxygen releasing experiment, an illumination regulating experiment and a temperature regulating experiment can be performed respectively or simultaneously, and the device for culturing theplant experimental materials is also suitable for plant culture. The device for culturing the plant experimental materials has various functions, high intelligence and automation, high experimental convenience and high accuracy, and the performing of various plant culture experiments is achieved. Meanwhile, the device for culturing the plant experimental materials also has the advantages of simplestructure, convenient assembly and low manufacturing cost.