279results about How to "Structural influence" patented technology

The invention relates to the technical field of energy storage material, in particular to inorganic phase change energy storage material. The material comprises the following components by mass: 70 to 99.5 % of energy storage material, 0.25-20 % of nucleating agent, 0.1-15 % of modifying agent and 0.1-15 % of water. The bases hydrate or crystalline hydrous salt, especially the bases hydrate is adopted as energy storage material; the nucleating agent adopts carbonate; and the modifying agent is dispersant. According to the inorganic phase change energy storage material, by selecting proper nucleating agent and the ration of the nucleating agent, material phase separation can be effectively solved, especially the phase change energy storage material prepared by adding the dispersant into a system has good cycling stability, and simultaneously the potential heat value does not change after circulation for thousands of times.

The invention provides a preparation method of high-purity collagen protein sponge, and relates to a preparation method of collagen protein sponge. The preparation method of the high-purity collagen protein sponge is used for solving the problems that the collagen protein sponge prepared by using a conventional method is long in production cycle and low in yield and purity and has poor hemostasis performance. The preparation method of the high-purity collagen protein sponge comprises the following steps: step one. pretreating fresh bovine heel tendons; step two. extracting collagen protein; step three. centrifuging; step four. salting out; step five. dissolving; step six. carrying out gradient dialysis; step seven. pre-freezing; step eight. carrying out freeze drying; and step nine. sterilizing. The final product prepared by using the method has a smooth and flat surface and relatively good hemostatic performance and is uniform in pore size distribution. The product has relatively high purity (the total amount of amino acids reaches 97.73%), an obvious hemostatic effect and no abnormal taste, is safe, non-toxic, high in yield and short in time; liquid is clear without impurities; the production cycle is shortened; the whole preparation process is carried out at a room temperature; the biological activity of the collagen protein is maintained; and the application of the high-purity collagen protein sponge in clinical is improved.

The invention relates to the technical field of energy storage materials, particularly a high-heat-conductivity inorganic phase-change energy storage material. The high-heat-conductivity inorganic phase-change energy storage material is composed of the following components in percentage by mass: 80-99.4% of energy storage material, 0.25-10% of nucleating agent, 0.1-15% of modifier, 0.1-15% of water and 0.15-19% of heat-conducting reinforcing material. The energy storage material is crystalline hydrated salt, the nucleating agent is carbonate or borate, the modifier is a polyacrylic acid emulsion or thickening powder, and the heat-conducting reinforcing material is one or mixture of more of graphite, carbon powder, copper powder, carbon fiber and silicon carbide powder. Compared with the prior art, the energy storage material has the advantages of high stability, low tendency to supercooling, high latent heat energy, high heat conductivity and the like. By selecting the proper modifier and proportion thereof, the heat-conducting reinforcing material and nucleating agent material can be successfully dispersed uniformly in the system, thereby solving the problem of the phenomenon of phase separation of the material due to long-term cycle, further enhancing the heat-conducting property of the material and being worthy of popularization and application.

The invention discloses a flight data recording method and device for small / medium-size unmanned planes. According to the method, components with low power consumption constitute an independent and complete flight data recording device, an independent rechargeable power supply is utilized to supply power to the flight data recording device, thereby achieving the goal of not occupying the resources of the existing unmanned plane autopilot system; and the independent and complete flight data recording device is provided with a sensor, a main control chip and a storage and transmission device, thereby achieving the goal of not influencing the data output interface protocol of the inherent sensor data bus of the unmanned plane. The method and device can not influence the structure of the existing unmanned plane autopilot system, and thus, can not influence the flight control performance. The system has the advantages of low cost of hardware circuits and small size; and a complete unmanned plane black box system is formed after installing a protective casing, and thus, the system is convenient for installation and operation and has favorable applicability and higher use value.

The invention belongs to the field of health care food, and especially relates to a composition used for improving skeletal system health, and applications thereof. The composition comprises skimmed milk powder, fructo-oligosaccharide, yak bone, orange fruit powder, D-glucosamine hydrochloride, bone collagen, chondroitin sulfate, herba epimedii extract, rhizoma drynariae extract, mushroom powder, magnesium carbonate, casein phosphopeptide, and vitamin K2. The composition possesses excellent prevention effects on patients with osteoporosis and skeletal system disorders such as ankylosis, arthritis, osteoproliferation, arthralgia, and myospasm, and is capable of increasing bone mineral density, and improving skeletal system health. The composition can be used for preparing health care food capable of improving skeletal system health; application range is wide; and economic benefit and social benefit are both high.

The invention discloses inter-working gateway device. It includes mail processing interface module used to receive mail, transfer matcher, transmit mail, and process fault, mail processing unit used in the interface and structure of matcher and processor to define open function and module, matcher and processor aggregates respectively used to realize different matching and processing function, mobile applying communication unit used to realize and maintain public function, protocol processing unit used to analysis and group protocol data packet. The invention also discloses the realization method and system used to interlink the internet mail service and mobile application. Thus it supports their intercommunication, can greatly reduce cost, realization complexity, and increase expansibility.

The invention discloses a micro-motion test method and system for structural damage detection of a civil engineering wallboard. The micro-motion test method comprises the following steps: a plurality of detectors are arranged on the surface of the wallboard according to the masonry, damage and other characteristics of a structure, and micro-motion signals are acquired through the detectors and recording equipment; the natural frequency and the natural mode of vibration of the structure are acquired through mathematical analysis; a finite element model (finite difference model) of the structure is built and perfected for eigenvalue computation so as to acquire the natural frequency, the natural mode of vibration and other dynamic response parameters; and the natural frequencies and the natural modes of vibration of a computation module and an actual measurement structure are compared to evaluate the break position and the break value (rigidity loss) of the response and position and quantify the damage. The invention further provides a corresponding system. The method and system have the advantages of simple equipment, high efficiency, no structural damage, strict transactional analysis, high precision of the analytic method, and no influence from the structural damage degree and complexity. Therefore, the invention provides a brand-new method for structural damage detection of the civil engineering.

The invention discloses a molecular sieve encapsulated rhodium heterogeneous core-shell catalyst for olefin hydroformylation, and a catalytic method thereof, and belongs to the field of novel catalysis materials. Submicron Silicalite-1 (S-1) zeolite molecular sieve grain supported rhodium ions are used as a crystal seed to induce epitaxial growth of an S-1 shell, a ruthenium catalytically active species is encapsulated in the S-1 zeolite molecular sieve to form the core-shell Rh@S-1 catalyst, and the catalyst is used in a heterogeneous hydroformylation reaction to synthesize normal aldehydes.The olefin conversion rate and the aldehyde yield are respectively more than 95%, a normal-to-iso ratio of the hydroformylation products is 1.1-2.0, and the catalyst can be recycled. Compared with homogeneous catalyst system industrially applied at present, the catalyst in the invention solves the problem of high energy consumption needed by separation of the catalyst and the hydroformylation products, and avoids the degradation abuse of the catalytically active component due to the high temperature rectification process during separation of the catalyst, so the recycling of the catalyst is benefited, and the catalyst has a broad application prospect.

The invention discloses a kit for detecting protein glycosylation subtype and a detection method thereof. The detection kit comprises agglutinin, confining liquid, a biotin labeled antibody, horse radish peroxidase labeled streptavidin, a 3',3',5',5'-tetramethyl benzidine substrate developing solution, a stop solution and a cleaning buffer solution. The detection method comprises the following steps: fixing the agglutinin onto a polystyrene solid phase carrier to be used for recognizing and binding glycoprotein in the sample based on specific recognition of agglutinin and an oligosaccharide chain, recognizing the glycoprotein needing to be detected by virtue of specific binding of the protein and the antibody thereof, and realizing semi-quantitative analysis of the glycoprotein. According to the detection kit and the detection method disclosed by the invention, semi-quantitative detection of single protein glycosylation subtype can be realized, and the kit is easy and convenient to operate and low in cost.

The invention relates to a method for lifting an extra-large type bow portion total segment. The method comprises the following assembling steps that subsections are reinforced, wherein weak gears of the subsections of a bow portion are reinforced through a steel channel connecting frame structure; a, lifters are arranged on the subsections, wherein the lifters for lifting are designed on the subsections, assembling of the subsections is considered, and the lifters of the subsections are utilized by the bow portion total segment for total segment lifting; b, anchor and mooring machines are mounted, wherein the subsections are assembled to form the bow portion total segment, the anchor and mooring machines are arranged on a deck of the bow portion, and wave walls behind the anchor and mooring machines are not mounted; c, the bow portion total segment is lifted; wherein a lower portion of the bow portion total segment forms an overall frame structure through a strong structure of a steel channel connecting total segment longitudinal wall, after the bow portion total segment is welded, the assembling size is measured, and the bow portion total segment is lifted to a ship body; d, the wave walls are lifted; wherein after the bow portion total segment is welded to the ship body, the wave walls are lifted to the deck of the bow portion total segment to be mounted.

A method for performing communication using a frame structure that supports a half-frequency division duplex (H-FDD) operation and a device using the same are disclosed. A base station performs resource allocation scheduling to support H-FDD user equipment operation in a mobile communication system. For example, the base station allocates first, second and last uplink subframes for idle subframes within a specific frame or punctures them, so that the H-FDD user equipment does not use the uplink subframes. The base station transmits the scheduled resource allocation information to the user equipment through a superframe header, a preamble and a MAP. The user equipment which has received the scheduled resource allocation information (subframe index and location that can be used by the user equipment) transmits and receives a signal based on the resource allocation information.

The invention relates to the field of geotechnical engineering detection and test, in particular to an underground continuous wall leakage detection method. The method is characterized in that the inner side and the outer side of an underground continuous wall are each provided with multiple test holes; resistivity detection is conducted on two adjacent test holes in the same side in sequence before and after foundation pit dewatering, and the resistivity profiles between the two adjacent test holes are worked out according to the detection result; the resistivity profiles of the same position before and after foundation pit dewatering are compared, if it is found that low-resistance abnormality exists in the resistivity profile after foundation pit dewatering compared with the resistivity profile before foundation pit dewatering, it is judged that leakage occurs to the position, corresponding to the low-resistance abnormal resistivity profile, of the underground continuous wall. The underground continuous wall leakage detection method has the beneficial effects that the amount of collected data is large, the detection resolution ratio is high, sensitivity to the resistivity difference is high, and a good effect is achieved on the aspect of ground wall leakage detection; and leakage detection can be conducted on a certain segment of the underground continuous wall at a time, and meanwhile, no influence on the structural body of the underground continuous wall is generated.

The invention discloses a detection device and a detection method for dynamics process of structure change of a micro region of a material. The device comprises two paths of laser light, one path of laser light reacts with the material, which results in that the structure of the micro region of the material changes, and the second path of laser light detects the dynamics process of the structure change. In the device and the method, a sample is automatically adjusted to a focal point of the first path of laser light by a CCD (charge coupled device) imaging method and a piezoelectric ceramic, and an objective lens with high numerical aperture is used so as to obtain the structure change of the micro region; the two paths of laser light are coaxial and vertically incident on the surface of the sample, light spots formed on the surface of the sample by the two paths of laser light are simultaneously observed through a CCD, and consequently, and the light spots of the two paths of laser light can be accurately superposed, which facilitates the detection on the dynamics process of the structure change of smaller regions; the utilization rate of the laser light is improved through a polarization beam splitting prism and a quarter wavelength plate, the two coaxial paths of laser light are completely separated by a dispersing prism and a total reflection principle, influence of non-detection light is removed, and detection precision is improved.

The invention relates to a battery management system wake-up system and a DC / DC converter. Except for a power unit, the DC / DC converter also includes a control module which is connected to a battery management system and controls and connects the DC / DC power unit. When the battery management system needs to be woken up, the control module controls the DC / DC power unit to be turned on, so that a power battery can supply power to the battery management system. Otherwise, the control module controls the DC / DC power unit to be disconnected, and then the power battery does not supply power to the battery management system. The battery management system wake-up system can reduce the software and hardware cost of the battery management system and can improve the operational reliability of the battery management system. Besides, the DC / DC power unit does not need to work for a long time, so that the service life of the DC / DC power unit is prolonged, and as a power line between the DC / DC powerunit and the battery management system is no longer charged for a long time, the potential safety hazard for the whole vehicle can be reduced.

The invention discloses a detection kit for determining serum amyloid A protein with latex-enhanced immunoturbidimetric assay, which contains R1 reagent and R2 reagent respectively. The detection kitfor determining serum amyloid A protein with latex-enhanced immunoturbidimetric assay adopts a new latex-enhanced immunoturbidimetric assay, wherein NHS reacts with carboxyl on microspheres to produceintermediate activated ester under the presence of EDAC to make the SAA detection kit more sensitive and stable; at the same time, Tween20 or Tergitol NP9 or other nonionic surfactant is added into the reaction system to prevent the microspheres from affecting the protein structure, so as to maintain activity and stability of the protein to the greatest extent and avoid agglutination phenomenon.

The invention provides application of fucosan sulfate with low molecular weight in treatment of enteritis. According to the application, antibiotic-associated diarrhea or clostridium difficile associated enteric infection and acquired diarrhea are prevented and treated through offering an effective amount of fucosan sulfate with low molecular weight, so that the shortage that preparations for preventing and treating clostridium difficile enteritis are scarce currently is made up.

The invention discloses a method for preparing beta-chitin from the sector bone of a squid. The method mainly overcomes the problems of severe environmental pollution and great possibility of chitin degradation in extraction of chitin by using conventional acid-alkali methods. The method comprises the following steps: drying and crushing the sector bone of a squid, carrying out sieving, then adding EDTA decalcification solution and concentrated hydrochloric acid, adjusting a pH value and carrying out ultrasonic water bath so as to obtain a decalcified reaction solution; adding acidic composite protease into the reaction solution, carrying out ultrasonic-assisted enzymatic hydrolysis and filtering and washing filter residue until the filter residue is neutral; and soaking the filter residue with a hydrochloric acid solution and carrying out secondary decalcification and drying so as to obtain a beta-chitin product. The method provided by the invention employs an ultrasonic-assisted EDTA process and enzyme process to prepare beta-chitin and has the advantages of short time, simple operation, mild conditions, small pollution to the environment and no influence on the structure of beta-chitin; and prepared beta-chitin has high purity and a good color.

The invention provides a PDLC membrane module, a manufacturing method and a display device thereof. The PDLC membrane module comprises at least two PDLC membranes and at least one public transparent substrate layer. Each of the PDLC membranes comprises two electrode layers and a PDLC layer arranged between the two electrode layers; the public transparent substrate layer is arranged between two adjacent PDLC membranes. The two PDLC membranes in the PDLC membrane module comprise two electrode layers, and the electrode layers close to the public transparent substrate layer cannot be formed on the PDLC but on the surface of the public transparent substrate layer, so that the forming process of the electrode layers does not affect the structure of each of the PDLC layers, the performance thereof is not affected, and therefore, the performance of the display device formed thereby is not affected.

The invention discloses a littoral zone plant dike dam suitable for a flowing water body. Continuous planting zones or discontinuous planting grooves basically vertical to a river bank zone are dug under the normal water level line of the river bank, the vertical height from the lower parts of the planting grooves or the planting zones to the normal water level line is smaller than 50cm, the depth of the planting grooves or the planting zones is greater than 30cm, and planting soil is filled in the planting grooves or the planting zones. The invention also discloses a construction method of the littoral zone plant dike dam suitable for the flowing water body. The littoral zone plant dike dam suitable for the flowing water body and the construction method of the littoral zone plant dike dam have the advantages that the littoral zone water and soil loss can be prevented, the survival rate of plants is improved, and the effects of completing the water body ecological system structure, restoring the degraded river bank zone function, purifying the water body pollution and beautifying the river bank zone are realized.

The invention discloses a dry-type transformer housing fixing structure. The structure comprises small vehicle pins which are arranged at the bottom of a transformer housing, and lifting screw rods which are arranged on upper clamping components of a transformer and extend out of the top of the transformer housing, wherein a bottom plate is flatly paved on each small vehicle pin; support sleeves with bolts are arranged on each bottom plate; the position of each bolt is corresponding to that of an mounting hole in a lower clamping component of the transformer; and a lifting ring is arranged at the top of each lifting screw rod. According to the structure, the assembling efficiency of the transformer is improved greatly, so that the cost is lowered. Therefore, the structure disclosed by the invention is suitable for large-scale intensive production.

The invention discloses an unmanned aerial vehicle risk-avoid flight data recording device and method. The method comprises the steps that components with little power consumption are adopted to form an independent and complete flight data recording device, a power supply is provided for the flight data recording device through an independent rechargeable power supply, and then the purpose of not occupying resources of an existing unmanned aerial vehicle automatic drive system is achieved; the independent and complete flight data recording device is internally provided with an induction system, a main control chip and a storing and transmitting device, and a judging unit is included and used for judging whether an unmanned aerial vehicle body enters a no-fly zone or not according to location information, obtained by a GPS interface, of the unmanned aerial vehicle body, further calculating the distance that the unmanned aerial vehicle body enters the no-fly zone, judging whether the distance is larger than a preset distance or not and controlling the unmanned aerial vehicle body to return according to a current flight route or controlling the unmanned aerial vehicle body to land. According to the unmanned aerial vehicle risk-avoid flight data recording device and method, the purpose of not influencing a data output interface protocol of an inherent sensor data bus of an unmanned aerial vehicle is achieved.

The invention discloses a coreless disc type motor. The coreless disc type motor comprises a shaft, a stator assembly, a rotor assembly, a front end cover, a rear end cover and a circuit board assembly. The stator assembly comprises a coil fixing support, a coil assembly and a coil cover plate; the coil fixing support is disc-shaped, and a central hole of the support sleeves the middle part of a shaft; the front end cover and the rear end cover are respectively fixed at the two sides of the coil fixing support; a plurality of fan-shaped coil positioning blocks are arranged inside the coil fixing support; the coil assembly is formed by connecting a plurality of fan-shaped windings; the fan-shaped windings sleeve the coil positioning blocks; the coil cover plate is fixed on the coil fixing support and covers the coil assembly; the rotor assembly comprises a disc-shaped back iron and a magnetic steel fixed on the back iron; and the back iron is fixed on the shaft. When a coil is damaged, what is needed is just to replace a damaged winding, thus maintenance is very simple and convenient, at the same time, such a structure enables motor power to be made larger, and the motor is high efficient and more energy-saving.

The invention provides an air conditioner, and a cooling system and a cooling method of a centrifugal unit transducer in the air conditioner. The cooling system comprises a condenser (3) and a transducer (1), wherein a cooling water flow path is arranged in the condenser (3), a cooling flow path is arranged in the transducer (1), and the cooling flow path is connected with the cooling water flow path in the condenser (3) through a water inlet flow path (5) and a water outlet flow path (6). In the cooling system, the condenser is directly connected with the transducer, the structure is simple, the water flow path is shortened, cost is saved, and the overall structure of the unit is not influenced; an expansion valve is adopted to control using quantity of cooling water according to the actual temperature of the transducer, the cooling effect of the transducer is stable and reliable and cannot be influenced by external conditions, normal operation of the whole unit is guaranteed, and simultaneously cooling water is saved; and by adopting the cooling system of the invention to carry out cooling, normal operation of the air conditioner is guaranteed on the premise of normal and stable operation of the transducer.

The invention provides a method for improving the photoelectric performance of perovskite. The method comprises the following steps of: S1, dissolving a certain amount of quaternary ammonium salt in asolvent to obtain a solution A; S2, immersing a perovskite film in the solution A for a certain period of time; and S3, removing the residual solvent on the surface of the soaked perovskite film by adopting air flow, and performing annealing. According to the method for improving the photoelectric performance of perovskite, the perovskite film obtained by the method of the invention is compact inthe surface and good in stability, and the device prepared based on the processed film shows the excellent photoelectric performance. The method is convenient to operate, and is suitable for large-scale production in factories.

The invention relates to a low-temperature-resistant and abrasion-resistant polyurethane coating and a preparation method thereof. The low-temperature-resistant and abrasion-resistant polyurethane coating is prepared from, by weight, 45-60 parts of polyurethane matrix resin, 0.5-6 parts of low-temperature polyester polyols, 3-20 parts of surface modifier modified micron powder, 5-12 parts of curing agents, 30-50 parts of solvent and 0.5-3 parts of defoamer. The low-temperature-resistant performance of the obtained polyurethane coating can be excellent by adding the low-temperature-resistant polyurethane matrix resin on the basis that the strong adhesion, excellent room-temperature mechanical performance, good stability and other characteristics of original polyurethane coatings are retained, the hardness of the coating is improved by adding the micron powder, and accordingly the coating has excellent abrasion-resistant performance. The coating can be used for protection of aircraft, wind turbine blades and other facilities in a low-temperature environment.

An inclination sensing type storage tank liquid level intelligent detection method is achieved through an inclination sensing type liquid level meter, an inclination sensor module, a temperature compensation module, an MCU processor module, a collection processing module and a data remote transmission module. A mechanical floating ball pointer is used as a working mechanism of the liquid level meter, an inclination sensing type liquid level meter pointer is used for measuring rotating angles, the processor module collects and processes each electrical signal converted from a pointer inclination, the liquid level and the volume of a storage tank are worked out according to corresponding relation of each angle and one liquid level and through correction of data by a temperature collecting module, and liquid level and volume data are output in a remote transmission mode through electrical signals and digital signals. For a remote storage tank without power supply, the inclination sensing type liquid level meter is provided with a solar panel and a storage battery power supply module, wireless networks such as CDMA or 3G or GPRS are used for remote transmission of data.

The invention discloses a surface modification method for a polyether sulfone filter membrane. The polyether sulfone filter membrane is treated by plasma, graft polymerization of glycidyl methacrylateon the membrane surface is triggered, then an epoxide ring opening reaction is triggered between the treated membrane and amino acid under a weakly basic condition, and the polyether sulfone filter membrane with the surface modified with amino acid zwitterions is obtained. The method has the advantages that the process is simple, the conditions are mild, and hydrophilicity and protein adhesion resistance of the polyether sulfone filter membrane are improved remarkably.

The invention provides a dustproof mesh enclosure for a radiator. A dustproof mesh capable of being unfolded for shielding or being folded to stack is arranged in front of the air inlet of the radiator, and a pulley and a reversing wheel are arranged through a fixing plate; a motor control box drives a winch deploying and retracting steel wire rope to control the dustproof mesh to unfold upwards or fold downwards along a U-shaped guide groove; the dustproof mesh stops dust, grass clippings, poplar catkins, insects and other debris, thereby reducing the adsorption and accumulation of the debris through radiator fins of a transformer to make a heat sink network be unimpeded and improve the heat dissipation effect of the radiator; the dustproof mesh enclosure of the radiator can be folded and unfolded, so that disassembly and assembly and cleaning maintenance can be easily conducted; the dustproof mesh of the radiator adopts an assembling structure, and the installation is convenient and simple; the installation mode of the dustproof mesh enclosure of the radiator adopts a special C-shaped clamp which is fixedly connected with the radiator, and the original radiator structure is not changed, so that the process of installation needs no punching or welding, and has no influence on the original component structure of the radiator.

The invention discloses a loading device for entirely applying a simulative load to an ocean work-over rig. The loading device comprises a front transverse beam and a back transverse beam which are symmetrically arranged at the both sides of an X shaft. The end parts of the front transverse beam and the back transverse beam are fixedly connected with a supporting leg of a base under the work-over rig; a left vertical beam and a right vertical beam are symmetrically arranged at the both sides of a Y shaft between the front transverse beam and the back transverse beam; loading boards are arranged on the end parts of the front transverse beam and the back transverse beam; connection through holes are arranged on the loading boards; and the front transverse beam, the back transverse beam, the left vertical beam and the right vertical beam are respectively provided with leveling and supporting hydraulic cylinders. The loading device disclosed by the invention can be used for entirely applying the simulative load to the ocean work-over rig when the ocean work-over rig carries out security detection and estimation test work in a condition of a field environment of an offshore platform, so that the comprehensiveness and the effectiveness of the test work can be ensured.

The invention discloses a preparation method of a metastable-state vanadium dioxide thin film by utilizing a direct-current magnetic sputtering technique. The preparation method comprises the following steps of (1) preparing a metal vanadium target, argon and oxygen, wherein a magnetic sputtering instrument at least comprises two vacuum cavities, namely a sample preparation cavity and a growth cavity, and the growth cavity is vacuumized to be below 4.5*10<-4>; (2) only introducing Ar, setting a sputtering powder, and cleaning oxidized parts and certain pollutant impurities off from the surface of the metal vanadium target; (3) heating a substrate, and maintaining the temperature for about 10 minutes; (4) introducing argon and oxygen, regulating the pressure intensity of the vacuum chamber to be 1 Pa, and starting a radio-frequency sputtering working source for sputtering with the powder of 40 W, wherein the ratio of argon to oxygen is 10:1; (5) after the thin film grows to the required thickness, closing a heating power supply, naturally cooling a sample, opening a vacuum valve in the process, and maintaining a molecular pump at an opening state. The thin film prepared by utilizing the preparation method has a good structure and good resistance-temperature coefficient.