57results about How to "Meet the sensitivity requirements" patented technology

The invention discloses a mercapto-beta-cyclodextrin modified silver nano-rod array, its preparation method and its use. The array is a silver nano-rod array with the surface modified by mercapto-beta-cyclodextrin, wherein the lengths of silver nano-rods are 150-600nm, the diameters of the silver nano-rods are 60-90nm, the space between each two silver nano-rods is 10-40nm, and the substrate of the array is formed by superposing one or more than two of a silver film, a gold film, a copper film and a nickel film which have the thicknesses of 20-50mum. The preparation method comprises the following steps: obtaining a through hole alumina template through using a secondary anode oxidation method, sputtering a metal conductive film on one surface of the through hole alumina template through using an ion sputtering method to obtain an alumina template with the metal conductive film, carrying out electric deposition through placing the alumina template with the metal conductive film in a silver electrolyte to obtain an alumina template with holes provided with the silver nano-rods and one surface coated with the metal conductive film, etching off the alumina template through putting the resultant alumina template in an acidic or strongly alkaline solution, and immersing the resultant material in an aqueous solution of the mercapto-beta-cyclodextrin for at least 1h to prepare the mercapto-beta-cyclodextrin modified silver nano-rod array. The mercapto-beta-cyclodextrin modified silver nano-rod array can be used for rapidly detecting trace PCB77 or PCB101.

The invention discloses a large dynamic range transimpedance amplifier with self-adaption controlling gain, which comprises a four-level amplifier, an output buffer, a signal processing unit connected in turn, three sets of switches for selecting gain amplification multiples and an amplitude detector which is connected to the signal processing unit and used forcontrolling the work of three sets of switches. The invention also discloses an optical receiver which comprises a transimpedance amplifier and a photolectric transducer module connected to the input terminal of the transimpedance prime amplifier. The invention also discloses a method for receiving and amplifying light signals which comprises the following steps: first, conversing photovoltaic; second, amplifying and processing the electrical signal by using the transimpedance amplifier, thereby the electrical signal is amplified at the first level; comparing voltage signal and selecting switch apparatus group; signal buffering and signal processing. The self-adaption control gain large dynamic range transimpedance amplifier and receiver can select the signal amplification series according to the input signal strength, which can satisfy the sensitivity requirement of the weak electrical signal and avoid the problem of overload of large input signal.

The invention discloses a scorpion seam receptor-based simulation flexible temperature sensor and a fabrication method thereof. The temperature sensor comprises a flexible substrate, a crack layer, aconduction layer and a temperature measurement layer, wherein the temperature measurement layer is used for generating bending and deformation according to temperature change, a plurality of cracks are arranged on the crack layer, the conduction layer comprises a first capacitor electrode and a second capacitor electrode which are respectively arranged at two sides of the cracks, and the conduction layer is used for obtaining a temperature change value according to a capacitance change value between the first capacitor electrode and the second capacitor electrode. When the temperature of a to-be-measured object is changed slightly, the temperature measurement layer is bent and deformed, the capacitance values of the first capacitor electrode and the second capacitor electrode are changed,so that the temperature is represented by a capacitor, and temperature detection is achieved. By a crack structure, the temperature sensor has ultrahigh sensitivity, and the requirement of the temperature sensor on the sensitivity is met.

The invention aims to disclose a radioactive monitoring system for pedestrians and baggage, comprising a radioactive security inspection device for monitoring radioactivity, and a remote monitoring and controlling platform for monitoring the radioactive security inspection device, display measurement results, statistically analyzing data and controlling the system; the radioactive security inspection device is in a communication connection with the remote monitoring and controlling platform; the radioactive security inspection device is internally provided with a gamma detector, a neutron detector and an electronics system; and the external side of the neutron detector is coated with a neutron moderator; the radioactive security inspection device is further provided with a display, an alarming lamp and an occupancy sensor. Compared with the prior art, the radioactive monitoring system for pedestrians and baggage sensitively responds to neutron rays and gamma rays; the neutron detector and the gamma detector are relatively small in volume and the whole volume of the instrument is small, so that the cost of installation and transportation is lower; and the radioactive monitoring system for pedestrians and baggage is applicable to security inspection in entrances of important places to realize the purpose of the invention.

The invention discloses a preparation method of an alpha-Fe2O3 / TiO2 nano-composite gas sensing material. The preparation method comprises the following steps: dispersing FeCl3.6H2O into a mixed solution of deionized water and ammonia water; stirring for 10 to 20 minutes; transferring the obtained mixed solution into a hydrothermal reactor; adding a prepared TiO2 nanofiber material; heating the hydrothermal reactor to be 95 DEG C for reacting for 4 hours; cooling the hydrothermal reactor to a room temperature; centrifuging sediment in the reactor with an ethanol solution repeatedly; drying at the temperature of 55 to 65 DEG C for 24 hours; calcining the material at the temperature of 500 DEG C for 2 hours to obtain the alpha-Fe2O3 / TiO2 nano-composite gas sensing material. In the preparation method, the alpha-Fe2O3 / TiO2 nano-composite gas sensing material prepared by combination of an electrostatic spinning technology and a hydrothermal method has a one-dimensional dentritic heterostructure, and can show a high gas sensing characteristic.

The invention discloses infrared phase locking and imaging method and device for surface and subsurface defect detection of an optimal element. The method and the device provided by the invention combine an infrared imaging technology with a phase locking amplification and detection technology; high-resolution image information related to the defect of a sample can be obtained by using a modulated pump laser excitation sample to generate periodic infrared radiation, using an infrared detection array to detect the generated infrared radiation, and carrying out phase locking amplification and detection on signals of the infrared detection array; and meanwhile, the influence of infrared signals inside a sample body on a detection result is eliminated by using the physical property that the penetration depth of the excited infrared radiation on some optical materials within a selected waveband is very limited, so that the imaging detection is only carried out on absorption defect distribution of the surface and subsurface of the sample. The method and the device are applicable to the detection and the imaging of the surface and subsurface absorption defect of the optical element, and are particularly suitable for the detection and the imaging of the surface and subsurface absorption defect of the common large-caliber optical element in an outsize high-power laser system.

The invention discloses a method and a device for measuring the accurate contents of core components of a liquid beverage in situ in the production process. The measurement can effectively provide timely information, can improve the product quality control level greatly, and can reduce the production cost. The technique also can be used for performing brand identity and supervision at the stages of transportation, storage and consumption of a liquid beverage; the mouthfeel and the value of the liquid beverage are normally determined by the contents of a small amount of core components of the liquid beverage, for example, the core components of beer are ethyl alcohol and carbon dioxide at the dissolved state; the core component of white wine and fruit wine is ethyl alcohol at the dissolved state; the core component of carbonated beverages is carbon dioxide at the dissolved state. The invention discloses a sensor based on a mid-infrared ray internal total reflection principle, which can be used for measuring the core components continuously and accurately on a production line synchronously; a characteristic absorption peak between 2.70 micron and 3.40 micron of ethyl alcohol at the dissolved state is selected, and the ratio of ethyl alcohol at the dissolved state is detected; a characteristic absorption peak at 4.27 micron of carbon dioxide at the dissolved state is selected. The measurement accuracy rate is higher than 99%, and the possible interference of a large number of solvent water molecules can be excluded effectively.

The invention relates to an ultrasonic flaw detection method and a device for upper arcs and lower jaw areas on both sides of a rail head. Each upper arc and lower jaw area on both sides of the rail to-be-tested is provided with an artificial defect of flat-bottomed hole. Each lower jaw ultrasonic probe of the ultrasonic flaw detection device on the rail head is successively pressed down to both sides of the rail tread, and the lower jaw ultrasonic probe emits ultrasonic waves downward, the rail moves, to perform the flaw detection on the lower jaw of the rail, when the rail passes through twosets of the ultrasonic flaw detection device of lower jaw on the rail head. Each ultrasonic probe for upper arc is successively raised to the two lower jaw faces of the rail, and the two ultrasonic probes for the upper arcs emit ultrasonic waves upward, the rail moves, to perform the flaw detection on the upper arcs of the rail, when the rail passes through two sets of the ultrasonic flaw detection device of upper arcs on the rail head. According to the ultrasonic flaw detection method and the device for upper arcs and lower jaw areas on both sides of the rail head, the method and the devicehave the advantages that the detection of the blind spot of the ultrasonic flaw detection on the upper arcs and the lower jaw areas of the rail head is realized, and that the cross section of the railhead covered by ultrasonic wave >=90% is realized.

The invention discloses a real-time fluorescence quantitative RT-PCR (reverse transcription-polymerase chain reaction) kit for detection of foot and mouth disease virus and seneca valley virus and application. The kit comprises primers and probes for detecting the foot and mouth disease virus and the seneca valley virus and preferably further comprises nucleic acid extract liquid, 2*Direct qRT-PCRMix, enzyme mixed liquid, negative control and positive control. By adoption of the kit for detecting the foot and mouth disease virus and the seneca valley virus, high specificity, high sensitivity,high stability, simplicity and convenience in operation and the like are achieved. Without extra extraction of virus RNA and reverse transcription, a user only needs to add a to-be-tested sample intoa reaction tube, then performs quantitative analysis on a start template according to fluorescence signal changes and a Ct value and standard curve relation and finally calculates a copy number of the to-be-tested sample. The kit is not only applicable to quantitative analysis in research and development institutions but also suitable for pathogen detection and analysis in all levels of prevention and control institutions, basic veterinary stations, large and medium sized farms and the like, thereby having a promising application prospect.

The invention relates to a radio frequency receiving channel circuit for realizing an anti-interference antenna of satellite navigation and a method. The radio frequency receiving channel circuit is integrated with functions of low-noise amplification, frequency mixing, and filtering. A radio frequency signal enters and passes through a low-noise amplifier filtering circuit; an amplifier N1 carries out low-noise amplifier and a filter Z1 carries out radio frequency filtering, and then a filter Z1 carries out radio frequency filtering, an amplifier 3 carries out low-noise amplification, and a filter Z2 carries out radio frequency filtering; the processed signal enters a down conversion circuit, a mixer carries out down conversion to generate an intermediate-frequency signal; a filter formed by an inductor L3, a capacitor C24, and an inductor L4 carries out filtering; the filtered signal enters an intermediate-frequency amplification and filtering circuit, an amplifier N6 carries out intermediate-frequency amplification, a filter N7 carries out intermediate-frequency filtering,, and then the signal enters a digital anti-interference circuit for processing. 1-dB compression points with sufficient sizes of amplifiers at all stages are selected, so that the high-interference signal with the signal-to-interference ratio of 70dB can be amplified linearly; and thus the signal can enter a circuit at a next stage effectively without any distortion.

The invention discloses a temperature-sensing wax mixture for a temperature-sensing component, comprising paraffin wax and heat-conducting carbon fibres having a heat conductivity coefficient of greater than 450 w / m.k. A preparation method for the temperature-sensing wax mixture comprises the following steps of: proportioning the paraffin wax and the heat-conducting carbon fibres in a certain proportioning ratio by weight, uniformly mixing, and then grinding for 50-120 hours by adopting a high-energy ball mill under the protection of an inert gas, thus coating a layer of paraffin wax protecting film around the heat-conducting carbon fibres, and then obtaining the temperature-sensing wax mixture. According to the temperature-sensing wax mixture, the heat-conducting carbon fibres are used for replacing copper powder, so that the cost is low, and the thermal expansion is good, and the selected heat-conducting carbon fibres have a heat conductivity coefficient of greater than 450 w / m.k, so that a response speed for temperature sense is greatly increased, and adaptability to application occasions with a high sensitivity requirement on the temperature-sensing component can be met; simultaneously, the heat-conducting carbon fibres and the paraffin wax are mixed and then ground by adopting the high-energy ball mill, thus coating a layer of paraffin wax protecting film around the heat-conducting carbon fibres, so that the heat sensitivity of the whole temperature-sensing wax mixture can be improved, and the process is simple and beneficial to industrialized production.

The invention relates to a method for detecting related substance in tauroursodeoxycholic acid, and especially relates to a method using a HPLC-ELSD technology to simultaneously detect eight related substances in tauroursodeoxycholic acid. According to the method, an octyl bonded silica gel chromatographic column and an evaporative light-scattering detector are adopted; and a mobile phase (A) and a mobile phase (B) are mixed to carry out isocratic elution or gradient elution, wherein the mobile phase (A) is an ammonium salt buffer solution with a concentration of 2.5 to 50 mmol / L, and the mobile phase (B) is methanol or acetonitrile. The provided method has the advantages of simpleness, rapidness, accuracy, reliability, and good resolution of chromatographic peaks, and is capable of simultaneously detecting eight related substances in tauroursodeoxycholic acid quantitatively or qualitatively.

The invention relates to a wireless optical communication system with double rotating ends, which comprises a rotating end A and a rotating end B with the same structure, a laser is fixedly arranged on a circuit board, and the circuit board controls the rotating ends to generate laser signals to enter a coupling optical fiber. The coupling optical fiber introduces an optical signal into the collimating lens to be changed into a parallel light beam, the parallel light beam enters the two-way color separation sheet to be reflected and enters the APD detector at the opposite end in the directionof the rotating shaft, and the optical signal is converted into an electric signal and transmitted to the circuit board at the local end to be processed. The lasers at the A end and the B end generatelasers with the wavelength being X nm and Y nm respectively, the two-way color separation part is fixedly installed on the structural part, the center of the two-way color separation part is locatedon the rotating shaft center line, and the surface normal and the rotating shaft center line form a 45-degree angle. And the two-way color separation sheet at the end A reflects the laser of Xnm and transmits the laser of Ynm. And the two-way color separation sheet at the B end reflects the laser of Ynm and transmits the laser of Xnm. The center lines of rotating shafts of the AB rotating ends coincide. Reliable high-speed communication can be achieved when the communication distance between the two ends changes from 5 mm to 500 mm.

The present invention relates to a correctable imaging laser radar receiver. The receiver comprises: a photoelectric detector module (10) configured to receive optical signals and convert optical signals to electrical signals (iin, 11~iin, mn); a high-voltage common mode level end (VCOM, HV) electrically connected with the input end of the photoelectric detector module (10) and configured to provide a voltage source for the photoelectric detector module (10); and an analog front-end integration circuit (20) electrically connected with the output end of the photoelectric detector module (10), configured to convert the electrical signals (iin, 11~iin, mn) to digital signals (DTA1~DATAm) and consisting of a photocurrent gain mismatching correction module (21) and a plurality of analog front-end signal processing circuits (22), wherein each output end of the photocurrent gain mismatching correction module (21) is correspondingly and electrically connected with each analog front-end signal processing circuit (22). The photoelectric detector reverse bias voltage correction method is employed to effectively eliminate the echo intensity signal detection errors caused by photocurrent gain mismatching.

The invention discloses a full-automatic test system for gas content of shale. The full-automatic test system comprises a first gas collecting device, a second gas collecting device and a valve position switching device, wherein the first gas collecting device and the second gas collecting device are both connected with the valve position switching device; the valve position switching device is connected with a water feeding device and a shale desorbing device; the first gas collecting device and the second gas collecting device are alternately connected with the water feeding device and the shale desorbing device through the valve position switching of the valve position switching device, so that the continuous water draining and gas collection can be realized between the first gas collecting device and the second gas collecting device; the valve position switching of the valve position switching device is controlled by a controller; liquid level sensors are arranged in both of the first gas collecting device and the second gas collecting device; the liquid level sensors are used for acquiring the water level elevation and transmitting to the controller in the manner of measuring the pressure difference of the shale gas and water in the process of water draining and gas collection. The full-automatic test system for gas content of shale disclosed by the invention has stable and reliable performances, meets the design requirement, is high in accuracy, is high in reproducibility and high in degree of automation and has wide application prospect.

The invention discloses a composite sensing membrane composed of polypyrrole, fluorescein isothiocyanate and porous alumina as well as a preparation method and an application of the composite sensing membrane. The composite sensing membrane is formed by orderly coating inner walls of the hole of a porous alumina membrane with polypyrrole and fluorescein isothiocyanate, wherein the porous alumina membrane is 70-90 mu m, the hole density is 109-1011 / cm<2>, the holes are through holes, and the diameter of each hole is 26-35nm. The preparation method comprises the following steps of: orderly dropping pyrrole ethanol solution and ferric chloride solution to the porous alumina membrane; putting the porous alumina membrane with the pyrrole ethanol solution and the ferric chloride solution under the negative pressure equal to or less than 0.1MPa for at least 10min; carrying out the ultrasonic cleaning to the porous alumina membrane with deionized water and ethanol so as to obtain the porous alumina membrane coated with polypyrrole on the surface and the inner wall of the holes; then immersing the porous alumina membrane into the fluorescein isothiocyanate ethanol solution with the concentration of 10<-3> to 10<-5>M for at least one hour; and washing the fluorescein isothiocyanate on the surface of the porous alumina membrane with ethanol to obtain the target product (composite sensing membrane). According to the composite sensing membrane, the trace 2,3,3'-trichlorodiphenyl can be effectively detected.

The invention relates to a rapid switching mode variable impedance transformer adaptive current protection method, characterized by comprising the following steps: 1) measuring the real-time three-phase voltages Ua, Ub, and Uc as well as the three-phase currents Ia, Ib and Ic at the wire inlet end of the transformer; then, using the symmetrical component method to convert the A-phase voltage and current, B-phase voltage and current and C-phase voltage and current into positive / negative zero-sequence voltages and currents; and 2) using the fault component method; based on the positive / negative zero-sequence voltages and currents in the normal state and the positive / negative zero-sequence voltages and currents in the fault state, calculating the fault components of the positive / negative zero-sequence voltages and currents. The protection method, through the real-time rectification of the current values, can meet the requirement for the sensitivity of a backup protection system so as to well address the problem that traditional protection is insufficient in sensitivity.

The invention provides a method for manufacturing intelligent composite-material laminates used for monitoring structural longitudinal strain. In order to solve the technical problems that as fiber grating sensors are bonded to the surface of a structure through polyimide resin or epoxy resin commonly used in the prior engineering, optic fiber in service is easily destroyed; the optic fiber can get encapsulation protection but cause the concentration of surrounding stress / strain thereof if the optic fiber is directly embedded in a composite-material structure; and thermal residual stress produced in a material-curing process can cause chirp phenomena of fiber grating reflection spectrum to affect the measurement accuracy of grating strain, and the like, the invention provides the method for manufacturing intelligent composite-material laminates used for monitoring structural longitudinal strain. In the method, the fiber grating sensors are embedded in composite-material layers to replace resistance strain gauges commonly used in the field of monitoring structural health; by applying prestress to embedded fiber gratings, the influence of the curing residual stress of composite material on the fiber grating reflection spectrum is reduced so as to avoid the chirp phenomena; and the stability and repeatability of the sensors are improved. In addition, the composite material plays agood role in encapsulating and protecting bare fiber gratings, and meets engineering construction requirement on sensor sensitivity.

The invention discloses a selecting method and a selecting device for light energy conversion gain of a photodiode in a CMOS (complementary metal oxide semiconductor) sensor. The selecting method includes: computing a light intensity value, wherein the light intensity is related to image brightness Y, exposure time TEXP and current light energy conversion gain FD and second gain of the photodiode; and selecting the light energy conversion gain matched with the light intensity value from a light energy conversion gain series, wherein the light energy conversion gain series comprises at least two types of light energy conversion gain. The selecting device comprises a light intensity value computing unit and a light energy conversion gain selecting unit. According to the method and the device, the proper light energy conversion gain can be intelligently selected according to different light intensities, so that the contradictions of yellow belts in highlight and poor sensitivity in dark light can be effectively overcome.

The invention provides an outlet housing for a range hood. The outlet housing comprises a lower housing connected with the range hood, an installation ring connected with an air outlet pipe, and valveblades capable of being turned over to be opened. The lower housing and the installation ring form an air outlet cavity of the outlet housing; an air inlet opening of the outlet housing is formed inthe bottom part of the lower housing; an air outlet opening of the outlet housing is formed in the top part of the installation ring; the valve blades are two valve blades rotating oppositely; the twovalve blades are connected into the air outlet cavity through a rotary shaft, and can be turned over to be opened or closed so as to connect or disconnect the air inlet opening and the air outlet opening; the two valve blades can form an opposite valve blade included angle ranging from 0 degree to 180 degrees; and the outlet housing outputs a corresponding detection capacitance value according tothe valve blade included angle. The two valve blades with different polarities can form a variable capacitance device, the outlet housing outputs the corresponding detection capacitance value according to the valve blade included angle, and the range hood can judge an open-close state of the valve blades according to the capacitance value detected in real time.

The invention discloses a biosensor for detecting tobramycin. The biosensor comprises an aptamer probe, a hairpin probe H1, a hairpin probe H2, Klenow Fragment polymerase, Nt.BbvCI endonuclease, a buffer solution and graphene oxide. The sequence of the aptamer probe is as shown in SEQ ID No: 1, the aptamer probe is formed by hybridizing an aptamer Aptamer with the sequence as shown in SEQ ID No: 2 and an amplification template T with the sequence as shown in SEQ ID No: 3. The sequence of the hairpin probe H1 is as shown in SEQ ID No: 4, and the sequence of the hairpin probe H2 is as shown in SEQ ID No: 5. When the biosensor is used for detecting tobramycin, the method is simple, the practicability is good, the stability is high, the detection lower limit reaches 0.06 nM and is lower than that of the existing similar sensors, and the biosensor has wide application prospects in the fields of environmental monitoring and food safety.

The invention provides an electromagnetic ultrasonic energy converter for automatic detection of a surface of a steel rod and belongs to the technical field of steel rod surface inspection. The electromagnetic ultrasonic energy converter comprises a detection coil, a magnetizing device and a work piece to be detected. The magnetizing device is formed by two sets of completely same coils and shells. The coils are formed by winding varnished wires and two sets of the coils are connected in series; and when the coils are electrified by direct current, namely a stable and constant magnetic field B is axially distributed in a rod material to be detected. The shell of the magnetizing device is made of a ferromagnetic material so that a magnetic field generated by the coils is limited in a magnetic circuit formed by the shell of the magnetizing device and the rod material to be detected; and therefore, the magnetization of the rod material can be realized to the greatest extent. The electromagnetic ultrasonic energy converter is mounted on a production line of the steel rod to carry out online detection on the quality of the rod material, find out the defects on the surface of the rod material in time and ensure the quality of a rod material product.

The present invention relates to a correctable imaging laser radar receiver. The receiver comprises: a photoelectric detector module (10) configured to receive optical signals and convert optical signals to electrical signals (iin, 11~iin, mn); a high-voltage common mode level end (VCOM, HV) electrically connected with the input end of the photoelectric detector module (10) and configured to provide a voltage source for the photoelectric detector module (10); and an analog front-end integration circuit (20) electrically connected with the output end of the photoelectric detector module (10), configured to convert the electrical signals (iin, 11~iin, mn) to digital signals (DTA1~DATAm) and consisting of a photocurrent gain mismatching correction module (21) and a plurality of analog front-end signal processing circuits (22), wherein each output end of the photocurrent gain mismatching correction module (21) is correspondingly and electrically connected with each analog front-end signal processing circuit (22). The photoelectric detector reverse bias voltage correction method is employed to effectively eliminate the echo intensity signal detection errors caused by photocurrent gain mismatching.

A protective circuit for a microcomputer type relay protection device comprises an operational amplifier, a resistor and an adjustable resistor, wherein the reverse-phase input end of the operation amplifier is connected with a digital ground wire through the first resistor; one end of the adjustable resistor is connected with the reverse-phase input end of the operation amplifier and the other end of the adjustable resistor is connected with the output end of the operation amplifier; the in-phase input end of the operational amplifier is the input end of the circuit and is connected with the output end of an analog-digital convertor A / D; and the output end of the operational amplifier is the output end of the circuit and is connected with the input end of the microcomputer type relay protection device. The protective circuit for the microcomputer type relay protection device provided by the invention has the effects that an in-phase operation amplification circuit is added in front of the microcomputer type relay protection device and a small resistance grounded current signal is amplified, so that the output signal can easily meet the sensitivity requirement of the microcomputer type relay protection device.

Photoelectrical mouse includes light emitting diode, set of lens for receiving beam reflected from plane of placing mouse, and optical inductor for receiving beam from the set of lens and determining position of mouse. Characters are that the disclosed mouse also includes key button for decreasing scanning precision, key button for increasing scanning precision, and calculator of scanning precision, and DSP in optical inductor. Based on initial value of mouse scanning precision, decreasing and increasing commands, final value of calculated scanning precision is output. Game player can adjust scanning precision of mouse without need of exiting from game so as to meet requirements of different sensitivities of mouse.

The invention discloses a device for continuously collecting shale desorption gas, which comprises a first gas collection device, a second gas collection device and a valve position switching device, wherein the first gas collection device and the second gas collection device are connected with the valve position switching device; the valve position switching device is connected with a water inlet device and a shale desorption device; the first gas collection device and the second gas collection device are alternately communicated with the water inlet device and the shale desorption device by valve position switching of the valve position switching device; the first gas collection device is communicated with the shale desorption device for water drainage and gas collection; the second gas collection device is communicated with the water inlet device for water inlet; and when the first gas collection device is full of shale gas collected in the first gas collection device, the valve position switching device performs the valve position switching, the second gas collection device is communicated with the shale desorption device for the water drainage and the gas collection, and the first gas collection device is communicated with the water inlet device for the water inlet. According to the device, a mode of reciprocating alternation of the two gas collection devices is designed based on a continuous measurement guide idea, and the continuity of a measurement process is ensured.

The invention discloses a digital micro-fluidic chip device for nucleic acid detection and a use method. A nucleic acid detection aqueous phase solution and an oil solution with the specific gravity smaller than that of water are added to a chip sample inlet at a time, then a chip is fixed on centrifugal equipment, and a water phase and an oil phase can be driven to enter the chip through centrifugation for 10-20 minutes. Finally, the result that the water phase is distributed in a micro-cavity of the chip and the oil phase is distributed in a micro-pipeline is obtained. Only 1-3 nanoliters of volume of reagent is needed for chip analysis of the invention. The analysis cost is greatly reduced, and the requirement on the sample content is reduced. The water phase and the oil phase can be injected into the chip at the same time, impurities are prevented from being introduced in multi-step experiments, and the accuracy of analysis is improved. The chip is simple in design principle, and samples can be separated by a one-step method only through a centrifugal device, so that digital PCR detection is realized.

The invention discloses an analysis system and a measurement method for measuring impurity components in high-purity gas, that is, the system integrates a helium ionization detector, a hydrogen flame detector, seven valves, seven columns, and three sample quantitative loops into one analysis system , realize the detection of various high-purity gases on one analysis system, such as high-purity ammonia, high-purity oxygen, high-purity nitrogen, and various impurity components in high-purity hydrogen, such as nitrogen, hydrogen, oxygen / argon, carbon monoxide, carbon dioxide and Methane, ethane / ethylene, acetylene, C3 hydrocarbon impurities; this method adjusts the switch of the valve so that the impurities in the high-purity gas are separated by the chromatographic column and then detected by the helium ionization detector and the hydrogen flame detector to obtain the determination of the impurities data. The analysis system can detect a variety of impurity components in a variety of high-purity industrial gases, reducing the cost of determination; this method meets the sensitivity requirements of high-purity gas analysis and the detection limit requirements of various impurity gases, and greatly improves the efficiency of determination and analysis.

The invention discloses a temperature-sensing wax mixture for a temperature-sensing component, comprising paraffin wax and heat-conducting carbon fibres having a heat conductivity coefficient of greater than 450 w / m.k. A preparation method for the temperature-sensing wax mixture comprises the following steps of: proportioning the paraffin wax and the heat-conducting carbon fibres in a certain proportioning ratio by weight, uniformly mixing, and then grinding for 50-120 hours by adopting a high-energy ball mill under the protection of an inert gas, thus coating a layer of paraffin wax protecting film around the heat-conducting carbon fibres, and then obtaining the temperature-sensing wax mixture. According to the temperature-sensing wax mixture, the heat-conducting carbon fibres are used for replacing copper powder, so that the cost is low, and the thermal expansion is good, and the selected heat-conducting carbon fibres have a heat conductivity coefficient of greater than 450 w / m.k, so that a response speed for temperature sense is greatly increased, and adaptability to application occasions with a high sensitivity requirement on the temperature-sensing component can be met; simultaneously, the heat-conducting carbon fibres and the paraffin wax are mixed and then ground by adopting the high-energy ball mill, thus coating a layer of paraffin wax protecting film around the heat-conducting carbon fibres, so that the heat sensitivity of the whole temperature-sensing wax mixture can be improved, and the process is simple and beneficial to industrialized production.

The invention relates to an apremilast related substance determination method. According to the method, an octadecyl silane bonded silica gel filler chromatographic column is adopted; a buffer solution is used as a mobile phase A, the buffer solution is phosphoric acid, a phosphate solution or a mixture of the phosphoric acid and the phosphate solution, the concentration of the buffer solution is 0.001 mol / L to 0.1 mol / L, and the pH value of the buffer solution is 2.5 to 2.9; acetonitrile is used as a mobile phase B; the flow velocity is 0.8 ml / min to 1.2 ml / min, an ultraviolet detector is used for detection, and gradient elution is carried out. The apremilast related substance determination method is simple in mobile phase system, short in analysis time and high in sensitivity; since the absorption wavelength of known impurities and the detection number of unknown impurities are comprehensively considered, the detectability is better.