59results about How to "Big temperature change" patented technology

The invention discloses a composite powered calcium sulfate sewage treatment agent and a method for preparing the same. The sewage treatment agent comprises the following materials in weight portion: 5 to 10 portions of tartaric acid, 3 to 5 portions of malic acid, 60 to 70 portions of calcium sulfate, 10 to 15 portions of magnesium carbonate, 10 to 20 positions of calcium carbonate, 10 to 20 portions of ferric chloride, 10 to 20 portions of calcium oxide and 2 to 3 portions of polyacrylamide. The method is to mix the materials. Compared with the prior art, the sewage treatment agent and the method have the advantages of multifunction, high efficiency, environment protection, quick sewage treatment speed, short treatment time, broad-spectrum and high-efficiency removal of various pollutants and harmful substances and strong adaptively to the sewage muddiness, wide pH value range and wide water temperature change of the sewage. The sewage treatment agent and the method have high alkalization degree, small corrosion, convenient production and no pollution in the production process, simple product package, convenient transportation and low composite cost.

The invention discloses a vehicle seat heating temperature control method. The method includes the following steps that when a certain heating gear is turned on or switched to, a current heating period is determined according to the temperature value corresponding to a current NTC sensor, wherein the heating period includes an initial temperature increasing stage, an approaching stage and a stable stage; according to heating strategies corresponding to each heating period, and the on-off state of a seat heating device is controlled stage by stage, so that the temperature of the surface of a seat reaches and is stabilized at an expected target temperature of the gear. The invention further discloses a corresponding device and system. By means of the method, device and system, the temperature of the surface of the seat can quickly reach and be stabilized at the expected temperature value, and the use experience is improved for users.

The invention discloses a control method of a multi-split air conditioner. The control method of the multi-split air conditioner is characterized by comprising the following steps that the indoor temperature of rooms in which indoor units in groups corresponding to the multi-split air conditioner are located is obtained; when the indoor temperature of some rooms meets the overheating or undercooling conditions, a target indoor unit corresponding to a first target room which satisfies the overheating or undercooling conditions is obtained; and other indoor units expect the target indoor unit inthe multi-split air conditioner are controlled to be stopped; and an operation mode of the target indoor unit is switched. The invention further discloses a control device of the multi-split air conditioner, a cloud server, a control terminal and a storage medium. The control method of the multi-split air conditioner avoids the situation that a user is uncomfortable due to the fact that the useris in an undercooling or overheating environment for a long time.

The invention provides a micro-bolometer based on graphene quantum points. The micro-bolometer comprises a substrate whose middle part is provided with a groove. The graphene quantum points are hanged above the groove and are connected through a graphene strip. Two ends of the graphene strip extend out of a graphene film to cover the substrate at two sides of the groove to form graphene electrodes. The micro-bolometer is characterized in that a hanged island-shaped graphene quantum point array is formed through the micro nano processing technology, the device temperature change in a same incident light power is increased by using the heat insulation effect by groove suspension, the device resistance temperature coefficient is raised by using quantization graphene, and the photoelectric detection is realized based on a micro-bolometer principle. Due to the absorption characteristic of a graphene material in an infrared wave band, the micro-bolometer provided by the invention can be used for the photoelectric detection of middle and far-infrared and terahertz wave bands, and a novel solution is provided for a present infrared photoelectric detector.

To provide a method for controlling an adsorption heat pump, an information processing system, and a control device capable of efficiently operating the adsorption heat pump even if the temperature of a heat source for supplying heat used to regenerate an adsorption agent changes greatly. A method for controlling an adsorption heat pump is provided with: flow rate adjustment sections (43a-43c) capable of individually adjusting the flow rates of streams of a heat medium supplied to electronic devices (41a-41c); the temperature sensors (45a-45c) for individually detecting the temperatures of the streams of the heat medium discharged from the electronic devices (41a-41c); and a control unit (30). The control unit (30) controls the flow rate adjustment sections (43a-43c) on the basis of the outputs from the temperature sensors (45a-45c) so that the temperatures of the streams of the heat medium discharged from the electronic devices (41a-41c) are the same.

The invention provides an integral window type air conditioner which comprises an indoor panel, a case, evaporators, indoor fans, a condenser, an outdoor fan, a compressor and a chassis, wherein the indoor fans of the air conditioner refer to a left independent cross-flow fan and a right independent cross-flow fan which are vertical to the chassis in the axial direction; two independent evaporators are arranged at the inner side, opposite to the cross-flow fans, of the case and surrounding the cross-flow fans, and an air inlet space is reserved between the two independent evaporators; a guide turbine scroll is arranged around the cross-flow fans; a part, corresponding to the air inlet space, at the top of the case is provided with an air inlet, and simultaneously the two sides of the case at the indoor side are respectively provided with an air outlet; when the cross-flow fans operate, air is absorbed into the case from the top of the case; and when the air flows through the evaporators, heat exchange is carried out, and then the air is guided by the guide turbine scroll to be discharged into the indoor from the air outlets at the two sides of the case. The air inside the air conditioner is discharged from the two sides, thus the supercooled air is prevented from being directly blown to users, and the air conditioner use comfort for the users is improved.

The invention discloses a double heating device for a jet printing machine adopting a micro-piezoelectricity printing head. The double heating device comprises an ink jet bracket (1) capable of moving on the jet printing machine; the ink jet bracket (1) comprises an upper bracket body (11) and a lower bracket body (12) connected with the upper bracket body (11); the upper bracket body (11) is provided with a plurality of ink boxes (2), and the lower bracket body (12) is provided with a plurality of jet heads (3); an ink pipe is arranged between each jet head (3) and the corresponding ink box (2); the ink boxes (2) are connected with first heating elements (4) for heating ink in the ink boxes (2); and the lower bracket body (12) is provided with second heating elements (5) for heating the ink jet ends (3a) of the jet heads (3). The double heating device is simple in structure and good in heating effect.

The invention discloses an alcohol-filling-based high-sensitivity photonic crystal fiber temperature sensor which mainly solves the problems that the temperature sensor of an existing fiber loop mirror (FLM) interference structure is low in sensitivity, poor in anti-external interference, and the like. The alcohol-filling-based high-sensitivity photonic crystal fiber temperature sensor comprises an incident fiber (1), a receiving fiber (2), an interference arm A (3), an interference arm B (4), an emergent fiber A (5), an emergent fiber B (6), a 3-d coupler B (7) with a beam splitting end being 2*2, a 3-d coupler B (8) with a beam combining end being 2*2, an alcohol filling type high-birefringence photonic crystal fiber (9), and a silver reflecting mirror (10). The 3-d coupler B (7) with the beam splitting end being 2*2, the interference arm B (4), and the 3-d coupler B (8) with the beam combining end being 2*2 form an FLM. The alcohol-filling-based high-sensitivity photonic crystal fiber temperature sensor is high in sensitivity and strong in anti-external electromagnetic interference capability, and can be applied to various practical engineering.

The invention discloses a fluorine insulating wire and a manufacturing method and applications thereof. The method comprises the following steps: (1) preheating a conductor to the temperature of 70-120 DEG C; (2) extruding a fluorine insulating material on the preheated conductor to obtain an extrudate by adopting a 45-type extruder, wherein the extruding temperature of the extruder is as follows: the temperature of a primary extruder area 1 is 265-275 DEG C, the temperature of a primary extruder area 2 is 295-305 DEG C, the temperature of a primary extruder area 3 is 335-345 DEG C, the temperature of a primary extruder flange is 355-365 DEG C, the temperature of a primary extruder head is 360-370 DEG C, the temperature of a primary extruder die opening is 365-375 DEG C, the temperature of an auxiliary extruder area 1 is 265-275 DEG C, the temperature of an auxiliary extruder area 2 is 345-355 DEG C, and the temperature of an auxiliary extruder area 3 is 370-380 DEG C; and (3) enabling the extrudate to pass through three cooling areas from the high temperature to the low temperature in sequence, wherein the temperature of a first cooling area is 60-80 DEG C, the temperature of a second cooling area is 30-50 DEG C, and the temperature of a third cooling area is room temperature. The product manufactured by the invention is good in temperature resistance and softness, has high temperature and low temperature resistance, oil resistance and wear resistance and the like, and has great market application value.

A starting method for an aluminum electrobath relates to aluminum electrobath starting, in particular to a large starting method which includes being charged into a furnace, baking and starting process. The method is characterized in that: a, the material components which are added when being charged into the furnace are 7 to 8 percent of added calcined soda, 9 to 10 percent of calcium fluoride, 5 to 6 percent of magnesium fluoride, 19 to 20 percent of electrolyte blocks and the rest percent of high molecular ratio cryolite; b, the starting process is to add the high molecular ratio cryolite with an amount of 3 to 4 times as that of the high molecular ratio cryolite used for being charged into the furnace in the electrobath, to add the calcium fluoride with an amount of 19 to 20 percent of that of the calcium fluoride used for being charged into the furnace, to add the magnesium fluoride with an amount of 32 to 34 percent of that of the magnesium fluoride used for being charged into the furnace, to add the calcined soda with an amount of 23 to 25 percent of that of the calcined soda used for being charged into the furnace and to add the electrolyte blocks with an amount of 1.4 to 1.6 times as that of the electrolyte blocks used for being charged into the furnace. The method of the invention adopts the high molecular ratio cryolite and reduces the amount of the calcined soda, thus being able to lead the molecular ratio to be more than 2.8 after starting the electrobath, improving the stability of the technique technology conditions and reducing the working intensity of workers.

The invention discloses a novel sample applicator for planar chromatography. The structure of the novel sample applicator comprises a temperature control sample application platform, an airflow control system and a motion control system. The applicator adopts a step-and-repeat sample application principle, a stationary phase absorbs a sample solution gradually in certain area range, and various modes are designed to promote solvent volatilization, so that a sample strip up to the mustard is formed. The working principle is as follows: gas output by a miniature air pump of the applicator or an externally connected air source enters a trace nozzle through adjustment of a gas measuring apparatus; the horizontally moving trace nozzle carries a trace sample application needle to perform uniform motion when a vertically moving pressing piece in the motion control system uniformly pushes a solution in the trace sample application needle out, the vertical movement and the horizontal movement are mutually matched, then the gas ejected by the trace nozzle carries the sample solution and is ejected to the surface of the stationary phase, and the uniform sample strip is formed. The sample applicator is stable in property, good in sample application repeatability and capable of meeting the sample application requirements for planar chromatographic analysis and separating preparation.

The invention discloses a steady test system and method for heat conduction coefficient and interface thermal resistance of a radiation heat-dissipation correction-type aviation background material. The device comprises a germanium solar absorption panel hot source, a radiation refrigerating plate cold source, a temperature test system and a data acquisition system, wherein the hot source and thecold source both are connected with a segment of cylindrical aviation aluminum-alloy material, a high-accuracy temperature sensor is arranged at an upper side of the aluminum-alloy material and is used for testing a temperature, the cold source, the hot source and a heat conductor connected with the cold source and the hot source can be maintained coaxially on a mechanical structure, a cold side is fixed, a hot side can axially move, radiation-prevention layers are arranged at outer sides of an aluminum-alloy heat conductor and a sample placement part, radiation-prevention layers are additionally arranged outside a temperature data acquisition device, the temperature sensor and a connection wire, and power is supplied to the acquisition device by a solar cell. The hot source and the radiation refrigerating panel cold source can stably work for a long time in a space environment, the system can be enabled to be adaptive to the space environment with the application of the aviation aluminum-alloy material, and the radiation heat dissipation of the test system in the space environment is isolated by the radiation-prevention layers.

The invention discloses a tri-dookie boron compound as well as a preparation method and application thereof. The tri-dookie boron compound is as shown in the specification and can be used as a temperature fluorescence device with liquid and solid self-reference in a liquid organic solvent and solid macromolecules. After the compound is mono-dispersed in the liquid organic solvent or specific solid macromolecules, the lighting color and intensity of the system are changed along with temperature, and the total fluorescence sub-efficiency is always relatively high. The fluorescence device is low in cost, high in shape plasticity, high in sensitivity and good in self-reference property.

The invention discloses a flexible connecting device for an IV-type tube bundle bottle and a container frame. The device comprises a damping block, an anti-rotation block, a lining, an upper clamping block, a lower clamping block and the like. The damping block matches the anti-rotation block to flexibly control the circumferential rotation of the IV-type tube bundle bottle. The lining is combined with the upper clamping block and the lower clamping block to limit the axial movement of the IV-type tube bundle bottle. Aiming at the characteristic that the joint of a boss structure of the IV-type tube bundle bottle and a plastic inner container / composite material winding layer is easy to lose efficacy, one end of the IV-type tube bundle bottle of the container is allowed by the device to axially move within a small range, restraining force borne by the tube bundle bottle during expansion / contraction is released, meanwhile, the damping block is extruded by utilizing the circumferential rotation trend of a bottle body to consume energy, and a torque borne by the joint of the boss structure and the plastic liner / composite material winding layer is reduced. According to the device, the stress condition of the IV-type tube bundle bottle in a container can be improved, so that the damage and failure risks of the IV-type tube bundle bottle are reduced.

The invention discloses a biology treating agent for inhibiting water eutrophication and a preparing method thereof. The biology treating agent is prepared from, by mass, 8-15 parts of radix mirabilis, 5-10 parts of clove, 3-7 parts of Xanthium sibiricum, 30-45 parts of modified diatomaceous earth, 40-50 parts of poly aluminum ferrous chloride, 12-15 parts of ferric sulfate, 12-15 parts of trichloro-isocyanuric acid, 20-25 parts of potassium citrate and 25-30 parts of disodium edetate dihydrate. By means of addition of the radix mirabilis, the clove and the Xanthium sibiricum and calcination treatment, the adsorption property of the modified diatomaceous earth and effects such as coagulation and electrical neutralization of polycation are effectively brought into play, alumen ustum is large and compact, the sedimentation speed is high, the effects of removing suspended substances like blue-green algae, turbidity, nitrogen and phosphorus and the like are remarkable, treated water is transparent, the water quality and the acid-base property are stable, and the biology treating agent has effects of many kinds of agentia such as a corrosion inhibitor and bactericide, so that water eutrophication is prevented.

A double-water-source heat pump system belongs to the range of water source heat pump system engineering. Nowadays, the energy conservation effect of a ground source heat pump is quite obvious, and the ground source heat pump has been increasingly approved. For an independent villa yard, a well type heat exchange heat pump is practical; but, generally a large amount of low-temperature cold water replaced out by the well type heat exchange heat pump in winder and a large amount of hot water replaced out by the well type heat exchange heat pump in summer are discharged out of a well and wasted, and if the low-temperature water is stored in winter to be reused in summer and the hot water is stored in summer to be reused in winter, higher energy-saving benefits can be achieved; and therefore development of a water source heat pump system capable of utilizing water in a seasonal manner is particularly necessary. For the requirement above, the double-water-source heat pump system is specially designed. The double-water-source heat pump system comprises heat exchangers, water containing sources, a compressor set, a utilization terminal and a controller. According to the double-water-source heat pump system, by effectively utilizing the beneficial effect that the double water sources supplement each other, the start time of the compressor set is shortened, the work period is optimized, air temperature regulation is conducted for the indoor portion of a building, and the aims of efficient energy conservation and zero emission are achieved.

The invention relates to a water heater control system with a zero cold water function and a working method. The system comprises a controller, a circulating pump and a water flow sensor. The controller comprises a single-chip microcomputer, a display unit and a key unit. The water flow sensor is used for detecting the flow velocity of water flow passing through a water flow circulation loop. Thesingle-chip microcomputer comprises a timing unit and a water quantity calculation unit, the timing unit is used for monitoring the time when water flow continuously passes through the water flow sensor at a time, and the water quantity calculation unit is used for obtaining data transmitted by the timing unit and the water flow sensor and conducting calculating to obtain the real-time water quantity Q1. The display unit is used for displaying the real-time water quantity Q1 and the set water quantity Q0, and the set water quantity Q0 is the volume of a hot water pipe. When the single-chip microcomputer receives a key instruction of a zero cold water key to enable the zero cold water function, the circulating pump is started, if water flow exists in the circulating loop, the real-time water quantity Q1 is heated to reach the set water quantity Q0, then a hot water use prompt is sent out through the display unit or a sound unit, and then the circulating pump is turned off.

The invention relates to ionic liquid phase-change heat-storage catalytic oxidation equipment, and mainly solves the problems of large temperature change, a low heat storage density and poorer safetyin a heat-storage heat-release process in the prior art. According to the ionic liquid phase-change heat-storage catalytic oxidation equipment provided by the invention, VOC-containing waste gas generated by a chemical device enters a phase change heat accumulator, preheating is performed, the preheated gas enters a gas mixer to be mixed with air or oxygen, a mixed gas passes through a fire blocking device to enter a catalytic oxidation reactor, a purified high-temperature gas at an outlet of the catalytic oxidation reactor enters the phase change heat accumulator to convert heat into latent heat of a phase change material for storage, cooled purified gas enters a tail-gas treatment device, and the treated gas achieves a discharge standard and is discharged, so that the technical solutionbetter solves the above problems; and the equipment can be used in catalytic oxidation.

The present invention relates to the field of desertification control, and discloses a soil regenerant for desertification control. The soil regenerant comprises 50-60 parts of sodium bentonite, 10-15 parts of humic acid, 25-35 parts of a gasification furnace slag modified material, and 0.5-1 part of a composite microbial agent, and the composite microbial agent comprises 1 part of a blue algae fermentation broth, 2 parts of a yeast fermentation broth, 1 part of an alternaria tenuissima fermentation broth, and 2 parts of an adsorbent. The soilregenerant can be suitable for neutral or alkaline desertification soil, plays an important role in reducing the pH of the soil, is very effective in promoting vascular bundle plant colonization in high-pH desert soil, can stabilize and protect the surface of the soil from erosion influence, and can form a microbial flora with other microorganisms in the soil to increase the quantity and activity of soil enzyme on the surface of the soil, so that the development and ripening processes of the soil are increased, and the aim of effectively improving the desertified soil is achieved.

A starting method for an aluminum electrobath relates to an aluminum electrobath starting process, and is characterized in that in the 300KA eletrobath, after coke particles are paved and the pole is hung, firstly an upper side and a side of an anode interpolar gap are plugged by a paperboard, then high molecular ratio cryolite is added to a bottom metacarpal edge clinging to the anode at the periphery of a cell, calcium fluoride is uniformly paved on an artificial leg, magnesium fluoride is uniformly added on the calcium fluoride, then an electrolyte block is charged on the cryolite abutting a side carbon block; after starting the high molecular ratio cryolite, the calcium fluoride, the magnesium fluoride, soda and the electrolyte block are added too, after roasting, the high molecular ratio cryolite, the calcium fluoride, the magnesium fluoride, the soda and the electrolyte block are added in to electrobath, and then the electrobath is started. The method of the invention adopts the high molecular ratio cryolite and reduces the amount of the soda, so that the molecular ratio is more than 2.8 after the electrobath is started, thereby improving the stability of the technique technology conditions and reducing the working intensity of workers.

A method for improving imaging properties of an optical system (10) and also an optical system (10) of this type having improved imaging properties are described. The optical system (10) has a plurality of optical elements. For at least partly correcting at least one imaging aberration, at least a first optical element (42) from the plurality of optical elements is positioned and / or deformed by means of mechanical force action (72) and by means of thermal action (76), or the at least first optical element (42) is positioned and / or deformed by means of mechanical force action (72) and at least a second optical element (46) from the plurality of optical elements is deformed by means of thermal action (78).

The invention discloses a watch glass anti-fog combination instrument, which is characterized in that a plurality of assembly holes are respectively formed in the edges of an upper casing and a lower casing, double-layer watch glass is arranged on the upper casing, a plurality of vent holes are formed in the surface of the lower casing, and a plurality of instruments are arranged between the double-layer watch glass and the lower casing. Through the arrangement, a gap is formed between the double layers of the double-layer glass and is sealed, the effective heat isolation is realized, the excessive temperature change of the inner watch glass is prevented, the generation of fog in the instruments is avoided, the ventilation of the inside and the outside of the instruments can be realized through the vent holes formed in the lower casing, fog generation on the surface of the inner watch glass is effectively prevented, and the driving is convenient.

The invention discloses a drying system with a heat recovery function. The drying system comprises a drying room body, an outdoor machine and an indoor machine. The interior of the drying room body isat least provided with one indoor fan for accelerating air flow in the drying room body, the top of the drying room body is at least provided with one heat recoverer, an exhaust channel and an air inflow channel which are independent are formed in each heat recoverer, and the exhaust channels and the air inflow channels communicate with the interior of the drying room body. High-temperature wet air and low-humidity dry air can do heat exchange at the positions of the heat recoverers, at the moment, heat of the high-temperature wet air is mostly transmitted to the low-temperature dry air, thedry air is heated, heat losses caused by emission of the wet air can be reduced, social energy is saved, the situation that when fresh dry air is supplemented into the drying room body, the temperature change in the drying room body is too large can be avoided, and therefore the drying system can normally run to work.

The present invention relates to a column temperature controlling high borosilicate glass interlayer chromatography column, wherein the upper end of a chromatography column body is provided with a material inlet, a sand core is arranged inside the chromatography column body, the lower end of the chromatography column body is provided with a material outlet pipe, the material outlet pipe is provided with a material outlet control valve, the diameter of the material outlet pipe is less than the diameter of the chromatography column body, a jacket layer is arranged on the outer periphery of the chromatography column body, the outer periphery of the chromatography column body is completely surrounded by the jacket layer, a cavity is formed between the jacket layer and the chromatography column body, the jacket layer is provided with a carrier inlet and a carrier outlet, and the temperature of a heating agent is maintained at the required temperature T DEG C during the chromatography process so as to continuously supply heat for the filler in the chromatography column body and the elution solvent. According to the present invention, with the column temperature controlling high borosilicate glass interlayer chromatography column, the column separation column temperature can be well controlled, the non-room temperature separation of the temperature sensitive specific component can achieved, the separation efficiency of the soluble components in the hot solvent can be improved, and the column temperature controlling high borosilicate glass interlayer chromatography column are widely used in the column chromatography separation process requiring the column temperature control in the fields of chemistry, chemical industry and pharmacy, and has promotion values.

The invention discloses a metal plastic composite material and preparing method, which is composed of three layers, wherein the middle layer is porous metal layer, the plastic on two sides of metal layer integrates metal layer through holes on the metal layer. The preparing method comprises the following steps: plugging porous metal bar in the mould hole on the composite mould inserting segment, compounding the fused plastic in the composite segment of mould and plastic squeezing machine, shaping, cooling, stripping to obtain the composite bar through common plastic squeezing machine.

The invention discloses a rapid germination accelerating method capable of stimulating corn seed germination through realgar. The method comprises specific steps as follows: seed drying, seed selection, seed soaking, germination acceleration, seed hardening and the like. The germination accelerating method is simple to operate and easy to implement, complicated steps are not required, a conventional germination accelerating step is mainly used, a realgar ingredient is added in germination accelerating and bud hardening processes, disease bacteria on surfaces of corn seeds can be killed, germination of shoot tips can be accelerated, meanwhile, the temperature changes a lot quickly in the bud hardening process, breeding of the disease bacteria can be inhibited, germinated buds are orderly, strong and robust by the aid of a nutrient solution added in the seed soaking process, the realgar is attached to surfaces of corn bud mouths, and root biting by underground pests is avoided.

The invention provides a fluorescent lamp, which is provided with a light-emitting tube made from quartz glass and emits ultraviolet rays, even if temperature difference between the internal and the external of the lamp is great, a fluorophor layer is not stripped. An ultraviolet reflective layer with silica particles as the main component is formed on a region of the internal surface of the light-emitting tube apart from a light taking-out zone, a glass layer formed by a substance with the softening point lower than that of the quartz glass is formed at the internal side of the ultraviolet reflective layer and the circumference of the light-emitting tube, a fluorophor layer is formed at the internal side of the glass layer, and the thickness of the ultraviolet reflective layer is 30-500 micrometers.

The present application relates to a multi-stage refrigeration method, device, computer equipment and storage medium of the above-mentioned air-conditioning unit. Set the third temperature, start the fixed-frequency unit and the variable-frequency unit asynchronously, give priority to the fixed-frequency unit for rapid cooling, and delay the start-up of the variable-frequency unit to avoid excessive temperature changes at the air outlet due to the sudden increase in cooling capacity; The difference between the temperature of the air supply outlet and the preset temperature, adjust the working frequency of the frequency conversion unit, adjust the cooling capacity of the air conditioning unit again, further optimize the temperature of the air supply outlet, and avoid the sudden change in the temperature of the air supply outlet to the environment (surrounding equipment or people). Influence, effectively reduce the variation range of air supply temperature.

The invention relates to the technical field of internet commodity retail, and discloses an intelligent constant-temperature device for network fresh food delivery. The device comprises a shell, a placement chamber is fixedly connected inside the shell, a supply plate is fixedly connected outside the placement chamber, and a temperature measuring mechanism is movably connected to the inner side of the placement chamber. The interior of the shell is movably connected with an adding mechanism, and the interior of the shell is fixedly connected with a tank body. A motor is powered on through an external power source, the motor is powered on to operate to drive a first rotating wheel to rotate under the action of a supporting plate, an electromagnetic pump is powered on to operate to convey liquid nitrogen in the tank body into a connector through a hose and convey the liquid nitrogen into the placement chamber through the supply plate, and then intelligent constant-temperature control over the temperature in the placement chamber is achieved. Large temperature change in a fresh food heat preservation box is avoided, it is guaranteed that the fresh food is always at the proper temperature in the distribution process, the freshness of the fresh food is guaranteed, the user experience of online fresh food purchase of a user is improved, and a fresh food delivery heat preservation box is safer and more sanitary.

Sanduryl boron compound and its preparation method and use. The invention provides a kind of Sanduryl boron fluorescent compound, which can be used as a liquid and solid self-referencing temperature fluorescent device in a liquid organic solvent and a solid polymer. Because such compounds are monodispersed in organic liquid solvents or specific solid polymers, the color and intensity of the luminescence of the system change with temperature, and the fluorescence quantum efficiency is always high. The fluorescent device of the invention has low cost, strong shape plasticity, high sensitivity and self-reference property. .