46results about How to "Wide operating temperature range" patented technology

The invention provides a low-molar-concentration I < + > stabilizer / zinc salt aqueous zinc-iodine battery electrolyte and an aqueous zinc-iodine battery, and belongs to the technical field of aqueous zinc-iodine battery electrolytes.The electrolyte comprises the following chemical components: an I < + > stabilizer, other zinc salts, a multi-iodide ion complexing agent, a diluent and water; in the electrolyte, the concentration of the I + stabilizer is 0.5-1.5 mol / L, the concentration of the other zinc salt is 0.5-2.5 mol / L, the mass fraction of the multi-iodide ion complexing agent is 3-15%, and the volume ratio of the diluent to the water is 1: (3-19); the multi-iodide ion complexing agent comprises at least one of polyvinyl alcohol, polyethylene glycol and polyvinylpyrrolidone. The electrolyte can still realize high coulombic efficiency of the aqueous zinc-iodine battery in the presence of a low-molar-concentration I < + > stabilizer / zinc salt, and also can inhibit side reaction at one end of a zinc negative electrode in the cyclic process of the aqueous zinc-iodine battery, shuttle effect of multi-iodide ions in the I- / I2 conversion process at one end of an iodine positive electrode and hydrolysis of I < + > in the I2 / I < + > process, so that the cycle life of the battery is prolonged, and the service life of the battery is prolonged. And the working temperature range is widened, so that the device can stably operate under severe conditions.

The invention provides a preparation method of a special aluminum electrolytic capacitor for a low-temperature-resistant detonator trigger, and the method comprises the following steps: cutting a positive electrode foil and a negative electrode foil, and riveting the cut positive electrode foil and negative electrode foil with a positive guide pin and a negative guide pin; placing electrolytic paper between the riveted positive electrode foil and negative electrode foil, winding the electrolytic paper to form a core package, injecting electrolyte into the core package, and sealing the core package in an aluminum shell by using colloidal particles to obtain a semi-finished capacitor; and cleaning the semi-finished product capacitor, sleeving, and sequentially carrying out primary aging sorting, secondary aging sorting, appearance observation and inspection to obtain the capacitor. The preparation method of the aluminum electrolytic capacitor special for the low-temperature-resistant detonator trigger is simple in production process, common in material and low in price, and the prepared aluminum electrolytic capacitor is excellent in electrical performance, wide in working temperature range and small in size.

The long-wave infrared athermalization wide-angle temperature measurement lens comprises a first lens, a second lens, a third lens, a diaphragm STOP, a fourth lens and an optical filter which are sequentially connected along an optical axis from an object side to an image side in an optical path mode. The object-side surface of the first lens is a convex surface, and the image-side surface is a concave surface. The object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the third lens is a concave surface, and the image side surface is a convex surface; the fourth lens element has a convex object-side surface and a convex image-side surface. By adopting the optimized first to fourth lenses, the number of used lenses is reduced, the cost is reduced, the horizontal visual angle is ensured to reach 90 degrees, and the number of apertures is less than or equal to 1.0. In addition, the total optical length is smaller than or equal to 50 mm, the structure is designed to be light, and the purpose of miniaturization is achieved. Meanwhile, the advantages of optical athermalization and active and passive focusing compensation of an electric tuning system are utilized, and high imaging quality is obtained under the complex environment temperature.

The invention provides a gel-state electrolyte and a preparation method thereof, and a zinc-bromine microbattery and a preparation method thereof, and belongs to the technical field of aqueous static zinc-bromine batteries. The xerogel is soaked in an electrolyte to obtain a gel-state electrolyte, ions in the electrolyte comprise bromide ions and zinc ions with electrochemical activity, and the concentration of the zinc ions is 5-12.5 mol / L. Reassembling the zinc-bromine microbattery through the gel-state electrolyte; a complexing agent and an anti-freezing agent do not need to be additionally added into the gel-state electrolyte, the preparation method is simple, the zinc-bromine microbattery can be used as energy supply equipment of flexible or microelectronic devices, the use scene and the application prospect of the zinc-bromine battery are remarkably widened, and stable energy supply can also be achieved under the variable-temperature condition. The zinc-bromine microbattery can be cycled for more than 5000 times at normal temperature, the specific capacity is 184 mu Ah.cm <-2 >, the zinc-bromine microbattery can also be cycled for more than 500 times at the temperature of-60 DEG C, and the capacity retention ratio is 98%.

The present invention discloses a liquid crystal compound and a composition with high-definition bright spots and low dielectric loss, as well as a high-frequency component containing the composition. The structure of the liquid crystal compound is shown in the general formula (I): wherein ring A and ring B are cyclohexyl, cyclohexenyl or benzene ring respectively; X 1 ~X 4 One of them is a methyl group, and the rest are hydrogen atoms; R is a straight-chain alkyl group, a straight-chain alkoxy group, a straight-chain fluoroalkyl group having 1 to 9 carbon atoms, or an alkenyl group or alkenyloxy group having 2 to 9 carbon atoms; m and n are 0 or 1; and the composition contains 1% to 40% of the compound represented by the general formula (I). The liquid crystal compound of the present invention has an extremely high clearing point and extremely low dielectric loss. The liquid crystal composition containing the compound of the present invention has an extremely high clearing point, and the temperature sensitivity of the dielectric properties is greatly reduced, which is very suitable for high-frequency devices working in high-temperature environments.

The invention relates to the technical field of building waterproof composite materials, in particular to an organic silicon modified resin building waterproof composite material and a preparation method thereof. Comprising a waterproof roll and a waterproof coating arranged on the surface of the waterproof roll, the waterproof coating is prepared from the following components in parts by weight: 20 to 32 parts of silane modified polyether, 15 to 30 parts of organic silicon modified resin, 5 to 10 parts of polysaccharide-based composite polylactic acid, 8 to 12 parts of plasticizer, 1 to 3 parts of curing agent, 0.5 to 2 parts of titanium dioxide and 0.5 to 3 parts of water removal agent. An organic silicon structure in the prepared waterproof composite material has the characteristic of low surface energy, so that the surface of a coating presents strong hydrophobicity, and liquid water permeation is effectively blocked; the waterproof coating can be matched with a compact cross-linked network structure to form a continuous and seamless waterproof film, realizes high hydrostatic pressure resistance and low water absorption, and is suitable for key waterproof parts such as roofs, basements and toilets.

This invention discloses a novel in-situ solid electrolyte and its preparation method, comprising: mixing precursor A and precursor B, and carrying out a hydrolysis-condensation reaction under the action of a catalyst to obtain a POSS-based curing agent with R1 and R2 groups; in an inert environment, sequentially mixing the POSS-based curing agent, a double lithium salt, an organic solvent, and an initiator to obtain a precursor liquid; injecting the precursor liquid into a battery casing and allowing it to stand and soak, so that the precursor solution can fully penetrate the electrode pores; heating the battery after liquid injection at 45-80°C for 4-24 hours to initiate the polymerization and cross-linking of the R2 groups to form a three-dimensional network, and the R1 groups undergo microscopic phase separation to repel the electrolyte phase, constructing ion transport channels in the POSS cross-linked network, while the POSS framework adsorbs and fixes anions, thus forming a solid electrolyte in situ; improving the rate performance of the battery and effectively eliminating the risk of lithium dendrite precipitation under low-temperature fast charging conditions.

The application discloses a kind of special fluorosilicone modified acrylic coatings of anti-fouling and anti-aging unique framework and a preparation method thereof, for the defects of traditional fluorosilicone modified acrylic coatings, such as single molecular framework, difficult to consider anti-fouling and anti-aging performance, poor synergistic effect, etc., by designing the unique three-dimensional molecular framework of "acrylic main chain-fluorosilicone branch-crosslinking framework", optimizing the formula, and using efficient controllable polymerization process, the special fluorosilicone modified acrylic coatings of anti-fouling and anti-aging unique framework is prepared.The formula includes 48-68 parts of unique framework fluorosilicone modified acrylic copolymer, 19-29 parts of anti-fouling and anti-aging pigment and filler and other environmentally friendly components, realizes the synergistic effect of fluorosilicone and the double improvement of anti-fouling and anti-aging, has excellent performance such as surface energy ≤26 mN / m, VOC ≤40 g / L, artificial accelerated aging ≥2000 h, outdoor service life ≥20 years, is convenient to operate and controllable in cost, is suitable for high-end outdoor special coating scenes such as building exterior wall and high-end venue, and can widely replace traditional outdoor coatings.

The invention discloses an alkaline zinc-iron liquid flow battery, which belongs to the technical field of liquid flow batteries. The alkaline zinc-iron liquid flow battery of the invention mainly comprises a positive electrode, a positive electrode electrolyte, a diaphragm, a negative electrode and a negative electrode electrolyte, wherein the positive electrode electrolyte comprises Fe(CN)6 4‑ or / and Fe(CN)6 3‑ , alkali and a regulator, wherein the regulator is MnO4 ‑ and MnO4 2‑ One or both of the above, by introducing MnO4 into the positive electrode electrolyte ‑ or / and MnO4 2‑ , increasing the concentration of positive electrode active materials, thereby increasing the battery energy density and reducing the volume of the battery system. At the same time, the lower limit of the operating temperature of the alkaline zinc-iron flow battery is reduced from room temperature to below 0°C, which broadens the scope of use of the alkaline zinc-iron flow battery and greatly reduces the system maintenance cost.

This invention discloses a locking and release device for a 4D-printed small satellite based on SMA (Super-Magnetic Atomizing) technology, belonging to the fields of aerospace and biomimetic 4D printing technology. The device consists of a main supporting shell 1, a launch platform 2, an auxiliary drive device 3, a locking lever 4, a locking and release spring assembly 5, and an energy storage spring assembly 6. The auxiliary drive device 3 controls the downward movement of the locking mechanism through temperature changes of the inner and outer springs, thereby compressing the energy storage spring assembly 6 and heating it to achieve autonomous energy storage. The launch platform 2 supports the satellite at its upper end and is tightly connected to the energy storage springs at its lower end. The locking and release spring assembly 5 is used to lock the satellite and drive its release. In summary, this invention provides a locking and release device for a 4D-printed small satellite based on SMA, making the failure modes of the satellite launch device effectively controllable and improving the device's adaptability to the extreme environment of space.

The application provides an air conditioning system, an air conditioner and a control method. The air conditioning system comprises a first refrigeration system and a second refrigeration system, the first refrigeration system and the second refrigeration system are arranged in parallel, a regulating condenser is arranged in parallel with the first refrigeration system and the second refrigeration system, the regulating condenser is communicated with a refrigerant storage device, and the first refrigeration system and the second refrigeration system are respectively communicated with the refrigerant storage device; the refrigerant storage device respectively stores the refrigerant from the first refrigeration system, the second refrigeration system and the regulating condenser, or respectively releases the refrigerant into the first refrigeration system, the second refrigeration system and the regulating condenser. The regulating condenser and the refrigerant storage device are added to the original air conditioning system, the refrigerant storage device can regulate the first refrigeration system and the second refrigeration system with different cold energy requirements respectively, the air conditioning system is effectively protected, the system pressure is regulated, and the system load is prevented from being too heavy.

The invention discloses a perovskite structure mixed ion-electron conductor material and application thereof in a lithium battery, and belongs to the technical field of lithium batteries. The general formula of the material is Li [alpha] Sr [beta] X [x] Ta1-y-zYyZzO3, wherein 0.12 < = alpha < = 0.56, 0.3 < = beta < = 0.44, 0.56 < = alpha + beta + x < = 1, 0.11 < = z < = 0.23, and 0.11 < = y + z < = 0.50. Enough free electrons are obtained in a mode of embedding and reducing the variable valence element Z by the metal lithium, and the conductivity property of the electrons is obtained. The mixed conductor has high ionic conductivity, high electronic conductivity can be obtained in an in-situ or ex-situ mode through lithium intercalation, and the interface stability and rate capability are improved. The method can be applied to an electrode interface, such as a filling electrode active particle gap and a negative electrode / electrolyte interface layer in a battery, and can be applied to devices such as a lithium ion battery, a metal lithium battery and an all-solid-state lithium battery.

This invention discloses a lanthanum-iron-molybdenum alloy cutting wire and its manufacturing method. The lanthanum-iron-molybdenum alloy cutting wire is made by adding 0.1-0.5% lanthanum nitrate solution and 0.01-0.05% ferric nitrate solution to molybdenum dioxide powder. The manufacturing method involves loading molybdenum dioxide powder into a mixer; mixing the lanthanum nitrate solution and ferric nitrate solution to form a mixture; loading the mixture into a feeder; adding the mixture to the mixer using the feeder while stirring; washing the feeder with pure water, and adding the washed solution to the mixer while stirring; thoroughly mixing and stirring in the mixer for 20-80 minutes; heating and drying after thorough mixing; cooling; and then processing the alloy wire. With a diameter of Φ0.18mm, its tensile strength can reach 2600-3500 N / mm². 2， When used in wire EDM, it is more wear-resistant and has a longer lifespan. Lanthanum-doped iron-molybdenum wire has a high recrystallization temperature, expanding the temperature range and extending the lifespan of the molybdenum wire.

The invention discloses a self-adaptive space energy system, and the system comprises a power management unit which controls an electromagnetic induction type wireless charging device, a graphene battery pack or a ground power supply to supply power to a spacecraft through transmitting a power control signal to a power distribution module according to the working mode information transmitted by an external main control computer, charging and discharging of the graphene battery pack are controlled; wake-up control of the graphene battery pack is carried out through a wake-up instruction sent by the wake-up module or an internal timing wake-up signal; detecting a power supply state according to the working state information fed back by the power distribution module; the electromagnetic induction type wireless charging device charges the graphene battery pack in a wireless charging mode; the wake-up module is used for performing signal conversion on the external light wake-up signal, generating a wake-up instruction and sending the wake-up instruction to the power management unit; the power distribution module supplies power to equipment needing power supply; and the working state information is fed back to the power management unit. According to the invention, the reliability problem of a single wake-up mode in a long-time sleep mode is solved.

The sheath heater includes: a metal sheath; a heating wire disposed in the sheath; an insulating material filled in the sheath to separate the metal sheath from the heating wire; a lead wire for supplying power to the heating wire; the crimping sleeve is used for connecting the heating wire and the lead wire which extend out from the end part of the metal sheath; a cylindrical member which covers an end portion of the metal sheath and in which the crimping sleeve is disposed; and a cover-shaped member fitted to the cylindrical member and including an opening into which the lead wire is inserted, an end portion of the metal sheath including: a first insulating tube including a first through-hole into which the heating wire is inserted; and a sealing material for filling a gap between the metal sheath and the first insulating tube, the sealing material including a ceramic adhesive.

The present invention addresses the problem of providing a halogenated polymer having excellent heat resistance and whiteness compared to known halogen-containing polymers. According to the technical scheme for solving the technical problem, the invention provides the halogenated polymer which contains bromide ions and is represented by the following general formula (1), and the content of the bromide ions is 1-2000ppm. # imgabs0 # (in the formula, R represents a C1-C6 alkylene group,-S-or-SO2-, and n represents a real number)

The utility model discloses a zoom projection lens which comprises a first lens assembly, a second lens assembly, a third lens assembly, a diaphragm, a fourth lens assembly and a fifth lens assembly which are sequentially arranged along a direction from an object space to an image space. A full-group linkage zoom design is adopted, and the first lens assembly is set as a zoom group for changing the focal length of the projection lens; the second lens assembly, the third lens assembly, the fourth lens assembly and the fifth lens assembly are arranged to be a compensation group used for offsetting the image surface position change caused by the movement of the zoom group. When zooming is carried out from the telephoto end to the wide-angle end, the distance between the second lens assembly and the third lens assembly is gradually increased. According to the utility model, the space occupied by the lens is reduced, so that the lens can adapt to the working condition of a compact installation space, the lens can maintain excellent imaging performance at different focal lengths within the working temperature range of a special application scene, and the flexible adaptability of the zoom projection lens is improved. The utility model also provides a projection system.

This invention belongs to the field of polymers and relates to a polypropylene roughening film for thin-film capacitors, its preparation method, and a metallized polypropylene film. The polypropylene roughening film comprises modified polypropylene grafted with alkenyl functional monomers, an antioxidant, and a processing aid. The modified polypropylene grafted with alkenyl functional monomers includes structural units derived from polypropylene as the matrix phase and structural units derived from alkenyl functional monomers as the dispersed phase. The ash content of the modified polypropylene grafted with alkenyl functional monomers is less than 50 ppm. The mass ratio of structural units derived from alkenyl functional monomers in the grafted state to structural units derived from alkenyl functional monomers in the self-polymerized state is greater than or equal to 1.0. The D50 of the dispersed phase is less than 450 nm. The film of this invention can maintain good dielectric and energy storage properties at high operating temperatures and is suitable for high-temperature and high-field-strength operating conditions.

The invention discloses a pure gas type direct current wall bushing which comprises a current-carrying conducting rod, a connecting cylinder and a shielding cylinder, the connecting cylinder is connected with an outdoor insulator and an indoor insulator, the connecting cylinder is provided with an inner flange, the connecting cylinder, the outdoor insulator and the indoor insulator jointly form a containing space, and the containing space is filled with insulating gas with preset air pressure. The shielding cylinder is located in the containing space, the middle of the outer surface of the shielding cylinder is connected with the inner flange, the current-carrying conducting rod is located in the containing space and penetrates through the shielding cylinder, one end of the current-carrying conducting rod is connected with the outdoor current-carrying terminal, the other end of the current-carrying conducting rod is connected with the indoor current-carrying terminal, and the indoor current-carrying terminal or the outdoor current-carrying terminal is connected with the head cover plate through the telescopic pipe. The pure gas type direct current wall bushing provided by the invention can better solve the contradiction between the insulating property and the thermal property.

The invention relates to a high-performance organic silicon packaging adhesive for a photovoltaic module, the packaging adhesive is an organic high-molecular compound taking a silicon-oxygen bond as a main chain, and a colloidal elastomer is formed after the packaging adhesive is cured; the working temperature range of the packaging adhesive is-55 DEG C to 250 DEG C, the light transmittance of the packaging adhesive in a visible light range is not lower than 92%, and after the packaging adhesive is aged for 1000 hours under the double-85 test conditions of 85 DEG C and 85% relative humidity, the light transmittance retention rate is larger than 95%; the packaging adhesive is prepared from a monomer mixture containing dimethyl dichlorosilane and methyl trichlorosilane through high-temperature reaction, hydrolysis and condensation processes under the action of a composite catalytic system of copper and various high polymer materials, and finally a network polymer with linear and cross-linked structures is formed. The core purpose of the invention is to provide a revolutionary photovoltaic packaging material which is high in light transmittance, extremely stable in chemical property, capable of greatly improving the reliability, the service life and the power generation efficiency of a component, and environment-friendly and recoverable.

This invention discloses an environmentally friendly water-based fire-fighting composite material for thermal runaway protection and its preparation method. The invention uses superabsorbent resin, epoxy resin, and a special fire-fighting liquid as main raw materials, which are mixed and then vibrated to form the composite material. The superabsorbent resin absorbs water to form a gel network, uniformly coating and fixing the special fire-fighting liquid to form a stable honeycomb composite structure. The epoxy resin provides mechanical support and a thermally conductive framework, jointly achieving integrated fire-fighting, heat dissipation, shock absorption, and thermal insulation functions. The material of this invention features flame retardancy, high-efficiency heat dissipation, shock absorption, and strong low-temperature adaptability. It can be filled between battery modules and PACK shells to quickly suppress fire and absorb impact during thermal runaway, while maintaining structural integrity and functional stability over a long period. The material preparation process is simple, environmentally friendly, and non-toxic, making it suitable for the safety protection of new energy battery systems.

The utility model belongs to the technical field of intelligent power supplies, and discloses an intelligent power supply thermostat for an advertising lamp box, which comprises a first shell, an aluminum battery module fixedly arranged at the bottom end of the inner wall of the first shell, and a heating module fixedly arranged at the top end of the aluminum battery module. A BMS protection system is detachably arranged at the bottom end of the inner wall of the first shell, and a first direct-current terminal is fixedly arranged at the bottom end of the inner wall of the first shell. Through the scheme, the intelligent power supply system can be used in a cold region in the using process, the BMS protection system has a temperature monitoring function, the internal temperature of the intelligent power supply system can be monitored in real time, and the intelligent power supply system is convenient to use. When the temperature is lower than the use temperature, a heating mode is automatically controlled to be started, so that the temperature of the intelligent power supply system is increased, the use temperature range of the application field of the intelligent power supply system is further expanded, and the intelligent power supply system is provided with DC48V, 12V and 5V output ports, meets the use requirements of various power supplies, and meets wider market use.

The invention relates to the technical field of high polymer materials, and discloses a wide-temperature-range oil-base-resistant drilling fluid composite material and a preparation method thereof.The composite material comprises hydrogenated butadiene-acrylonitrile rubber, acrylate rubber, butadiene rubber, polyvinyl chloride resin, N, N-dimethylformamide, a coupling agent and an antioxidant. The rubber material is prepared from N, N '-m-phenylenedimaleimide, dibutoxyethoxyethyl adipate, triisooctyl phosphite, silicon dioxide, an anti-aging agent, carbon black, a vulcanizing aid and a process aid. According to the composite material provided by the invention, through the synergistic effect of all the components, the composite material with the use temperature range of-50 DEG C to 160 DEG C and good drilling fluid tolerance can be obtained.

The invention provides an electrolyte, a battery, an energy storage device and an energy storage system. The electrolyte comprises an electrolyte salt, a first organic solvent, a second organic solvent and a first additive, the first organic solvent is a polar solvent, the second organic solvent is a non-polar solvent, and the first additive comprises sodium difluorophosphate and sodium bis (fluorosulfonyl) imide.

The utility model relates to power equipment technical field especially is depth fusion zero sequence voltage sensor, include: three sensing units, three sensing units set up in three solid -sealed pole respectively, correspond three -phase circuit respectively, every sensing unit all includes resistance row, overvoltage protection module and isolation transformer, the resistance row is constituted by multiple resistance series connection, overvoltage protection module is electrically connected in the output of resistance row, isolation transformer's input winding one end is electrically connected in overvoltage protection module, input winding other end connects sensor ground end, isolation transformer's output winding is used for output voltage signal after processing, the output winding of isolation transformer is exported through the aviation socket, and the aviation socket is exported through the aviation plug line, three signals are connected in series, and the signal after series connection is zero sequence voltage signal, realizes the effective, stable, high-precision output of zero sequence voltage.

This invention discloses a method for automatic gyroscope drift compensation in a high-precision optical axis motion control device, belonging to the field of servo turntable control technology. This invention uses a three-axis fiber optic gyroscope mounted on the pitch axis to sense spatial angular velocity. Fiber optic gyroscopes eliminate errors caused by friction from rotating mechanical parts, resulting in high angular velocity measurement accuracy and a wide range of measurable angular velocities. The laser gyroscope used in this invention has a velocity measurement range of ±600° / s and a minimum sensitive angular velocity of less than ±0.001° / s. Fiber optic gyroscopes have a wide operating temperature range, from -50℃ to 60℃, requiring no heating, and exhibit short start-up time and fast system response. This invention proposes a method for automatic gyroscope drift compensation in a high-precision optical axis motion control device, employing a two-stage coarse-fine compensation method to achieve rapid compensation for fiber optic gyroscope drift. It first performs a coarse compensation, followed by up to five (the number of times is configurable) fine compensations. The algorithm is simple and efficient, with short compensation time, and does not consume significant CPU resources for complex calculations, thus improving optical axis stability.

This invention discloses a low-melting-point molten salt energy storage material and its preparation method, belonging to the technical field of physical heat transfer energy storage materials. This method involves introducing modified silicon carbide nanowires and modified sheet-like zinc-aluminum flakes as functional fillers generated through a mercapto-olefin click reaction to composite modify a ternary nitrate molten salt. Compared to the unmodified basic molten salt system, the prepared low-melting-point molten salt energy storage material achieves comprehensive improvements in thermal performance, corrosion resistance, cycle stability, and physical structural stability. Its melting point is approximately 81-93℃, which is lower than that of SolarSalt. Compared to existing mixed molten salts, its melting point is lower to varying degrees, significantly reducing the overall system cost, improving system safety and stability, achieving a wider operating temperature range, and increasing power generation efficiency.

The present invention provides a dry ice temperature control system and method for a modem for ground testing of a rotor system, wherein the dry ice temperature control system comprises a portable dry ice thermostat, a fiber grating demodulator and a control system, wherein the thermostat comprises a dry ice room and an equipment room, the dry ice room and the equipment room are isolated by a partition, and a cooling fan is arranged on the partition; a first temperature sensor is arranged in the equipment room; a second temperature sensor is arranged in the dry ice room; the fiber grating demodulator is arranged in the equipment room; the fiber grating demodulator is connected to a fiber grating signal input line, and the fiber grating signal input line is connected to a fiber grating temperature sensor. The present invention adopts dry ice as a cold source, does not require additional energy, reduces the power output burden of a helicopter in the air without ground support, and the temperature control method monitors the dry ice temperature in real time, can adjust the cooling fan in real time according to the dry ice temperature, and the temperature adjustment process is smooth, which can achieve an ideal cooling effect.

A multi-point array detection system for radioactive waste liquid surface contamination is used to monitor radioactive contamination on the surface of radioactive waste liquid storage tanks. It includes a main frame, a movement control device, detectors, and a host computer. The main frame has multiple mounting holes arranged in a planar array. The movement control device controls the main frame to move closer to or further away from the surface of the radioactive waste liquid storage tank, and to move into or out of the area above the surface. Multiple detectors are installed in the mounting holes of the main frame, with all detectors facing the surface of the radioactive waste liquid storage tank. The host computer is used to adjust the parameters of the CMOS sensors, and to store, display, analyze, and process frame images. This invention, through a detachable array of detectors arranged in a planar array, can cover the entire surface area of ​​the radioactive waste liquid storage tank in one measurement, obtaining a panoramic view of the contamination distribution in a single measurement, reducing the time required for point-by-point detection from several hours to just minutes.

The invention relates to a low-temperature microcrystalline glass sealing material, a preparation method thereof and application of the sealing material to packaging of a PCFC (Poly Crystal Fuel Cell) electric pile, and aims to solve the problems of high use temperature, insufficient crystallization at low temperature and the like when the existing microcrystalline glass brazing filler metal is used for sealing a fuel cell. The preparation method comprises the following steps: 1, taking BaCO3, SiO2, B2O3, MgCO3, SrCO3, Al2O3 and TiO2 as raw materials, and carrying out ball milling; 2, melting the mixed powder at high temperature, and pouring glass melt into deionized water for water quenching to obtain glass particles; and 3, carrying out high-energy ball milling on the glass particles, and screening and drying to obtain the microcrystalline glass sealing material. By adding a certain amount of titanium dioxide, the crystal phase distribution, the microstructure and the use temperature range are effectively improved. The microcrystalline glass prepared by the invention has excellent compactness, chemical stability, thermal cycling stability and reliable sealing performance, and improves the long-term operation life and efficiency of a PCFC cell stack.