85results about How to "With temperature" patented technology

A double network polymer hydrogel and a preparation method thereof provided in the invention, relate to a biomedical material. The polymer hydrogel comprises the following ingredients: 60-90wt% of polyethylene glycol maleic anhydride diester and N-isopropyl acrylamide or acrylamide copolymer, and 10-40wt% of N-isopropyl acrylamide or acrylamide homopolymer. The preparation method comprises the following two steps: first, utilizing an esterification reaction between polyethylene glycol PEG and maleic anhydride to obtain polyethylene glycol maleic anhydride diester with carboxyl as end group, then carrying out in situ polymerization, chemical crosslinking or UV photo-initiation crosslinking between polyethylene glycol maleic anhydride diester and a functional monomer such as N-isopropyl acrylamide or acrylamide and the like to form a soft network micro-area by the copolymer and form a hard network framework by the homopolymer of the functional monomer, so as to obtain the double network polymer hydrogel consisting of the soft network micro-area and the hard network framework. According to the invention, the hydrophilcity and biocompatibility of the hydrogel are improved, and the hydrophilcity has high mechanical strength, and sensitivities of rapid PH, temperature and electric field. The preparation method is simple and easy for industrialization.

The invention belongs to the field of nano biological medical materials and particularly relates to polymer vesica with the surface deposited with antibacterial nano silver and a preparation method thereof. Amphipathic block polymers are self-assembled by a cosolvent method to form the vesica, and then the nano silver is generated in situ on the surface of the vesica. The polymer vesica has biocompatibility and has certain temperature and pH sensitivity; a cavity structure of the vesica can wrap various medicines; and simultaneously, due to the existence of the nano silver, the vesica also has the curative effects of sterilization and bactriostasis.

The invention relates to a method for preparing filler-level silicon micropowder by using waste quartz crucibles as raw materials. Aiming at the problems that the quartz crucible waste products have great stock at present and high-quality silicon natural resources are scarce increasingly, the invention provides a method for preparing silicon micropowder which is suitable for serving as fillers and has high purity, wide particle size distribution and low electric conductivity by using waste quartz crucibles as raw materials through the technical treatment of ultrasonic washing, crushing, levigating and acid washing, flotation, magnetic separation, flashing and drying, electric separation and the like. By adopting the method, the problem about resource exhaustion of high-purity quartz mine and the problem about comprehensive utilization of waste quartz crucibles of photovoltaic enterprises and crucible preparation enterprises are relieved to a certain degree.

The invention discloses a thermo-sensitive and degradable micro hydrogel as well as a preparation method and application thereof. The structure of the micro hydrogel is shown as a formula M3 in the specification. In the formula M3, m represents the repetitive unit number of L-lactic acid, n represents the repetitive unit number of glycol, m=9-21, and n=23-69. The preparation method comprises the following step of conducting radical copolymerization reaction and interlinking reaction on N-alkyl acrylamide, a degradable double-bond blocked cross-linking agent of a poly(L-lactic acid)-polyethylene glycol-poly(L-lactic acid) triblock copolymer and an initiator. The preparation method is simple and easy to control. The obtained micro hydrogel has dual performances of thermo-sensitivity and degradability, high purity and excellent stability. The micro hydrogel can be used in the fields of biological medication and medicine controlled slow release.

The invention relates to a method for preparing a core-shell structured intelligent nano hydrogel. The method comprises the following steps of: (1) preparing an aqueous solution of hydroxy-propyl cellulose (HPC); (2) dissolving the aqueous solution of HPC and acrylic monomers in deionized water, stirring, adding a crosslinking agent and an initiator, introducing nitrogen, adding an accelerator, stirring to obtain a polyacrylic nano hydrogel, dialyzing for 3 to 7 days, and regulating the pH value to be 3-4 to obtain a solution A; (3) dissolving acrylamide monomers and a crosslinking agent in deionized water, stirring, and introducing nitrogen to obtain a solution B; and (4) pouring the solution B into the solution A obtained in the step (2), introducing nitrogen to obtain a solution C, adding an initiator, heating, introducing nitrogen, and adding an accelerator finally. The preparation method has the advantages of mild reaction conditions and simple and easily controlled equipment; and the prepared nano hydrogel has controlled size, high stability, pH and temperature dual responsibility and high biosafety, and can be applied to the field of control release of medicines.

The invention discloses an ultrahigh-frequency sensor tag chip which comprises a radio-frequency receiving / transmitting module, a power module, a memory and a digital processing module, wherein the power module is in bidirectional communication with the radio-frequency receiving / transmitting module, and supplies power to the digital processing module; the memory is connected with the digital processing module; the ultrahigh-frequency sensor tag chip also comprises a sensing acquisition module; the signal input end of the sensing acquisition module is connected with the signal output end of the power module; and the signal output end of the sensing acquisition module is connected with the signal input end of the memory. The tag chip has the characteristic of abundant functions of sensing temperature, humidity and chemical quantity; and the chip structure is optimized so that the signal processing is quicker and more centralized. The tag chip has the advantages of strong practicability, high integration, stable performance and the like, is suitable for large-scale production, and has great significance in food storage, cold chain management, drug control, coal mine safety and the like.

An amphiphilic fluoride segmented copolymer and its production are disclosed. The procedure is carried out by oxygen anion initiation polymerizing, reacting polymer with hydroxyl terminal group with strong lye to obtain low-polymer oxygen anion, and reacting it with methyl-acrylic acid and methyl-acrylic fluoride ester separately as initiator to obtain final product. It has fast reactive speed, higher conversion rate and purity.

The invention relates to a comprehensive durability testing machine for an automobile switch. The comprehensive durability testing machine comprises a high and low temperature environment test box, aprogram-controlled power supply, a test fixture, a fixing fixture, a fixture rack, a motor driver and a motion control card; the fixture rack is movably installed in the box body of the high and low temperature environment test box; the program-controlled power supply, the motor driver and the motion control card are all positioned outside the high and low temperature environment test box; the program-controlled power supply is connected with the automobile switch via a wire; the motor driver is connected with a high and low temperature motor of the test fixture via the wire; and the motion control card is connected with the motor driver via a cable. The comprehensive durability testing machine has the beneficial effects that the comprehensive durability testing machine of the automobile switch has the temperature and humidity adjustment function, can be applied to the tests of the pressing type automobile switch, the plugging type automobile switch, the toggle type automobile switch and the knob type automobile switch, and can judge the success rate of the automobile switch through performing current monitoring on the automobile switch in the test via the program-controlled powersupply.

The invention relates to a multifunctional flue gas treatment system. The multifunctional flue gas treatment system comprises an SCR (selective catalytic reduction) denitrification unit, a flue gas-air heat exchange unit, a bag type dedusting unit, a desulfurizing tower, a heating unit and a flue gas exhaust system which are sequentially connected by pipelines, wherein a wet type electrical mist removing unit is arranged between the desulfurizing tower and the heating unit, and is used for removing mist droplets in the flue gas treated by the desulfurizing tower, and exhausting the treated flue gas into the heating unit; the flue gas exchanges heat with the hot air outputted by the flue gas-air heat exchange unit in the heating unit, and then is exhausted into the flue gas exhaust unit; the desulfurizing tower is communicated with a wastewater treatment unit, and the wastewater treatment unit is used for receiving wastewater drained by the desulfurizing tower, and treating the wastewater. The multifunctional flue gas treatment system has the advantages that the structure is simple, the sulfur dioxide and oxynitride in the flue gas can be effectively removed, the residual heat can be effectively utilized, and the wastewater can be effectively treated.

The invention discloses a ball mill used for producing graphite powder. The ball mill comprises a roller, a power drive device, a feeder and a dumping device, wherein two star brackets which are parallel to each other are arranged on the inner part of the roller; material distributing tubes are uniformly arranged on the inner parts of the star brackets; five cylindrical ball-milling tanks which are parallel to each other are uniformly distributed between the two star brackets; the two ends of each cylindrical ball-milling tank are provided with supporting tube racks; a synchronous motor is arranged on the inner parts of the star brackets; the cylindrical ball-milling tanks realize autoroatation around the star brackets; the two ends of the roller are respectively provided with a front positioning bearing and a rear positioning bearing; and the cylindrical ball-milling tanks realize rotation around the front positioning bearing and the rear positioning bearing. The ball mill is simple in structure, high in practicability, not only can realize autoroatation and rotation of the cylindrical ball-milling tanks and improve material crushing efficiency and material crushing quality, but also can pre-heat and crush materials, so that the materials are guaranteed to have certain temperature while being output, and therefore, crushing requirements of different materials are met.

The invention discloses a high-rigidity low-water-absorption nylon 6 composite material. The high-rigidity low-water-absorption nylon 6 composite material is characterized by being prepared from the following raw materials in parts by weight: 100 to 120 parts of nylon 6, 10 to 30 parts of barrier, 3 to 5 parts of nano montmorillonite, 30 to 50 parts of alkali-free glass fibers, 1 to 2 parts of silane coupling agent solution, 3 to 5 parts of nano layered silicate, 5 to 10 parts of acrylonitrile-butadiene-styrene-terpolymer, 1 to 10 parts of polytetrafluoroethylene, 3 to 5 parts of toughening agent, 1 to 5 parts of compatilizer, 0.1 to 1 part of heat resisting agent, 0.1 to 1 part of antioxidant, and 0.1 to 1 part of lubricating agent. The high-rigidity low-water-absorption nylon 6 compositematerial can still keep good rigidity in a water environment.

The invention provides an automatic edge cutter of a textilene mesh fabric setting machine, belonging to the technical field of machines. The automatic edge cutter solves the technical problems that the edge cutting accuracy of the existing automatic edge cutter of the textilene mesh fabric setting machine is low, burrs are apt to occur and the like. The textilene mesh fabric setting machine comprises a transverse beam which is erected at a fabric outlet. The automatic edge cutter comprises an upper seat body and a lower seat body which are connected onto the transverse beam. An upper cutter head which is driven by a motor is arranged on the upper seat body. A lower cutter head which is arranged below the upper cutter head is arranged on the lower seat body. An adjusting mechanism which can enable the upper cutter head to push against the lower cutter head is arranged between the upper seat body and the lower seat body. A heating structure which can be used for heating the upper cutter head is additionally arranged on the upper cutter head. The automatic edge cutter of the textilene mesh fabric setting machine has the advantages of accurate edge cutting size, attractive edge and the like.

Disclosed is an inorganic heat-storage, energy-saving and temperature-regulating wall material. The technical scheme includes that a certain quantity of high alumina cement, vitreous beads, aluminum silicate powder, bentonite, redispersible polymer powder, hydroxypropyl methyl cellulose, polypropylene fibers, starch ether 6200, gray calcium powder, water repellent or waterproofing agent, air-entraining agent and asbestos wool are mixed, and are sufficiently mixed in a cyclone separation manner and packaged to form a finished product. When heated (by heat sources such as sunlight and the like), the low-carbon heat-storage, energy-saving and automatic temperature-regulating wall material becomes liquid when reaching saturated temperature, and heat energy is stored; and when external temperature is lower than set temperature, the heat-storage material begins to release heat, after the heat is released thoroughly, the phase-change material becomes solid from the liquid, and the process runs in circle. The inorganic heat-storage, energy-saving and temperature-regulating wall material can be made into a section, a plate, mortar and a perforated brick, can absorb sound wave, is elastic, and vibrates, rebounds and reversely absorbs under sound wave impact, frequencies of the material are different, structural vibration is relieved, and the purpose of eliminating noise is achieved.

The invention relates to the technical field of biomedical polymer materials, in particular to a method for preparing a selenium-containing degradable amphiphilic polymer through ring-opening polymerization and application thereof to hydrogel.The polymer is a BAB type tri-block polymer synthesized with selenium-containing micromolecules as an initiating agent, the hydrophobic polymer block A is formed by biodegradable polycaprolactone, and the hydrophilic polymer block B is formed by polyethylene glycol monomethyl ether; a polymer water solution of a certain concentration is liquid at the room temperature or below room temperature, is in a stable gel state at the human body temperature and has syringeability.The method has the advantages that ring-opening polymerization is adopted, polymerization is controllable, the obtained product is accurate in molecular structure, and molecular weight distribution is controllable.The prepared polymer has multiple stimulative responsibility to temperature and redox, and therefore the physical hydrogel is high in applicability to the field of drug carriers.

The invention is applicable to the technical field of roadbed engineering construction and maintenance, and provides a heat pipe type solar photothermal device aiming at roadbed frost heave, comprising a photothermal conversion tube, the photothermal conversion tube is sleeved with a light transmission tube, a vacuum cavity is formed between the photothermal conversion tube and the light transmission tube, two ends of the photothermal conversion tube are respectively connected with a first joint and a second joint, and an end cap is arranged on the first joint to form a seal at one end of thephotothermal conversion tube; one end of a thermal dissipation tube is connected with the second joint and is in communication with the photothermal conversion tube, the other end of the thermal dissipation tube is provided with a tapered guide cap, and the inside of the photothermal conversion tube and the inside of the thermal dissipation tube are filled with a first heat transfer medium; a first tube shell is located inside the photothermal conversion tube, a second tube shell is fixed in the inside of the thermal dissipation tube through a bracket, one end of the first tube shell and one end of the second tube shell are connected through a sealing piece, the inside of the first tube shell and the inside of the second tube shell are in conduction, and a second heat transfer medium is infused into the first tube shell and the second tube shell, so as to solve the problem that the effect of the frost heave prevention measures for the roadbed is not ideal.

The invention relates to a cold-resistant ultraviolet-resistant low-smoke halogen-free flame-retardant cable sheath and a preparation method thereof. The cable sheath is composed of the following components in parts by weight: 40-100 parts of silane crosslinked polyethylene, 12-30 parts of inorganic flame retardant, 15-30 parts of granular carbon black, 0.5-1.5 parts of light stabilizer, 0.5-1.5 parts of antioxidant, 0.5-3 parts of titanate coupling agent, 1-5 parts of EVA (ethylene-vinyl acetate) resin and 10-15 parts of talcum powder. The cable sheath has the advantages of superhigh ultralow temperature resistance, superhigh ultraviolet resistance, favorable flame retardancy, high tensile strength, high elongation at break, excellent aging temperature and indexes, excellent volume resistivity, excellent oil resistance, excellent scratch and wear resistance and excellent flexibility, and fills the blank in the current domestic market of cable sheath materials.

The invention belongs to the field of physical chemistry, and provides a temperature-sensitive tri-block polymer, reduction and ultrasonic-sensitive core-shell structural microgel with the same and application of the reduction and ultrasonic-sensitive core-shell structural microgel. The structure of the temperature-sensitive tri-block polymer is PEI<m>-b-PNIPAM<n>-b-PEI<m>, the temperature-sensitive tri-block polymer is amphiphilic at the lower critical solution temperatures (LCST) and can be subjected to self-assembly in aqueous solution to obtain micelle solution with uniform particle sizes in stable states, PNIPAM<n> is used as a core of the micelle solution, and PEI is used as a shell of the micelle solution. Addition can be carried out on micelle and cross-linking agents BAC<y> to obtain reduction-sensitive gel shells, and disulfide bonds on the shells can be selectively cracked by reducing reagents such as GSH, TCEP and DTT. The temperature-sensitive tri-block polymer, the reduction and ultrasonic-sensitive core-shell structural microgel and the application have the advantages that halothane molecules with gas-liquid phase change properties can be loaded, accordingly the core-shell structural microgel with ultrasonic response can be obtained, and the purpose of target medicine administration can be achieved.

The invention discloses a newborn infant multifunctional aseptic cabin. The newborn infant multifunctional aseptic cabin comprises an incubator (1),a rolling wheels (2), fixing ropes (3), swinging supports (4), an air input port (5), an air input pipeline (6), an air controller (7), a motor (8), a middle pillar (9), a central controller (10), universal wheels (11), a movable plate (12), a medicament control device (13), a medicament input pipeline (14), a medicament input port (15), supports (16), cameras (17), an induction panel (18), a sound player (19), an astigmatism device (20), a baby mattress device (21), movable windows (22) and an air exhaust opening (23). Beneficial effects of the newborn infant multifunctional aseptic cabin are that the newborn infant multifunctional aseptic cabin can carry out sterilization and disinfection itself, can provide pure oxygen, has a medicament gasification absorption system, has an air quality automatic adjustment function and has a mother sense simulation system, and parents can interact with the baby constantly.

The invention relates to a sintering method of abrasion resisting abrasive particles, and belongs to the technical field of preparation of coated abrasive tools. The method comprises the following steps of: mixing 5-15 parts of mineral polymeric material bonder, 1-10 parts of alkali compound, 10-30 parts of stuffing and 60-100 parts of abrasive material; dissolving the components in glycol ether; adding 2-5 parts of catalyst; heating and mixing at a constant temperature within 30-50 DEG C; mixing to a semi-gel state, adding 0.5-1 parts of template to sinter, wherein the sintering temperature is 300-400 DEG C and the sintering time is 6-9 hours, quickly annealing and cooling, smashing, sieving and separating abrasive particles in same size. The abrasive particles prepared by the method provided by the invention are abrasion resistive and anti-blocking, and workpieces are not burned in long time grinding.

The invention provides a fermentation control method which comprises the following steps: placing saccharified wheat juice into a corresponding yeast growing tank; after yeast proliferation, delivering raw material solution into a can body for further fermentation; when the fermentation temperature rises, guiding cooling alcoholic solution into a cooling jacket; when the fermentation degree of the appearance is 60%, closing a jacket cooling agent valve and raising the temperature naturally for bi-diethylstilbestrol reduction; after temperature rise, starting to seal a can for boosting and then fermenting; when the fermentation degree of the appearance is 65%, raising the temperature according to the preset rate; eliminating yeast for the first time and maintaining a certain pressure and temperature; emptying the yeast and filtering, so as to complete beer fermentation, wherein in the fermentation process, a temperature control module and a pressure control module are used for controlling temperature and pressure. The method provided by the invention is automatically controlled by a computer, the control method is flexible, the quality of beer is improved, the fermentation period is shortened, the system is stable and reliable, and the maintenance management is convenient.

The present invention pertains to a stretch knitted fabric which exhibits an instantaneous temperature rise when stretched and which, by the repetition of stretching and relaxation, lastingly generates heat when stretched. A stretch knitted fabric which is composed of a non-elastic yarn and an elastic yarn, characterized in that the instantaneous temperature rise caused by heat generation at 100% warpwise and / or weftwise stretching is 1.0 DEG C or more.

The invention provides a multifunctional infant protector, comprising a main engine for protecting and warning and a slave engine which is located near an infant. The salve engine comprises a temperature sensor, a humidity sensor, an illumination intensity sensor, a first microprocessor and a first wireless module, wherein, the first microprocessor is composed of a collection module and a first transmitting module which is connected with the first wireless module; the main engine comprises a second microprocessor, a second wireless module and an alarming circuit, and the second wireless moduleis matched with the first wireless module; the second microprocessor comprises a second receiving module and a remote warning module for comparing each received sensor signal with preset normal rangeand sending out an instruction for starting the alarming circuit when the sensor signal exceeds the normal range; the remote warning module is connected with the alarming circuit. The invention has the function of detecting temperature, humidity and illuminance, avoids waking up infants effectively and has fine applicability.

The invention discloses hydrogel with multiple response function and a preparation method and application thereof; the preparation method of the hydrogel comprises the steps of adding hydrogel material, acryloyl chloride and triethylamine into a solvent, and reacting under ice bath to obtain modified hydrogel material; adding diselenide-diol, acryloyl chloride and triethylamine into a solvent, reacting under ice bath to obtain modified diselenide with C-C double bond; mixing the modified hydrogel material solution with the modified diselenide solution, adding a photo-polymerization initiator, and irradiating in ultraviolet at 20-40 DEG C to generate hydrogel having multiple response function. The hydrogel material is responsive to temperature, light and redox, quick gelling can be achieved by adjusting temperature, bulk concentration, photo-polymerization initiator concentration and a light source, the hydrogel is easy to form and has excellent mechanical properties and biocompatibility, and redox responsiveness of the hydrogel helps load different drug molecules and release them effectively.

The invention relates to an automatic reclosing protection switch with a fire alarm protection function. The characteristics lie in that the automatic reclosing protection switch with a fire alarm protection function comprises an automatic reclosing protection switch and a temperature detection unit, an inlet side of a power supply line is connected to an inlet side of the automatic reclosing protection switch, an outlet side of the automatic reclosing protection switch provides power for a load, the temperature detection unit detects the temperature of the surrounding environment, the temperature detection unit outputs an alarm signal when the temperature of the surrounding environment exceeds a set value so as to trigger the automatic reclosing protection switch to operate, and the automatic reclosing protection switch operates to cut off power supply. The automatic reclosing protection switch is complete in function, can report fire alarm information effectively, timely and accurately, and automatically cuts off a power line at the scene of an accident to prevent expanding of the accident, thereby minimizing the loss, and guaranteeing the life and property safety of people.

The invention discloses a planting greenhouse monitoring device for intelligent agriculture. The planting greenhouse monitoring device comprises a greenhouse body and the ground, a water pump is arranged at the top of a water storage tank, an atomization sprayer is arranged at the bottom of a spraying pipeline, a fan and an air heater are mounted at the top of the greenhouse body of one side of the spraying pipeline, a temperature sensor, a humidity sensor, a soil humidity sensor, a carbon dioxide sensor and an illumination sensor are mounted at the top of a supporting bracket, a solar panel is mounted at the top of the greenhouse body through a supporting rod, an alarm is mounted at the top of a mounting shell, and a temperature and humidity controller and a PLC (programmable logic controller) are mounted on the surface of a mounting shell. By the aid of the water pump, the atomization sprayer, the solar panel, the temperature sensor, the humidity sensor, the soil humidity sensor, thecarbon dioxide sensor, the illumination sensor, the alarm, the temperature and humidity controller and the PLC, the device solves the problems of single function and incapability of adjusting temperature and humidity.

The invention discloses a winding device for spun cloth. The winding device comprises a rack, wherein a winding roller is spliced at the front side of the rack; the rear side of the rack is fixedly connected with a supporting base; a rotary shaft is spliced on the surface of the supporting base; the surface of the rotary shaft is fixedly connected with a winding disc; the surface of the rack is fixedly connected with a motor; the output shaft of the motor is fixedly connected with one end of the rotary shaft; the upper side of the rack is fixedly connected with a supporting cushion; and the inner wall of the supporting cushion is fixedly connected with a heating wire. According to the winding device for spun cloth disclosed by the invention, the motor operates, so that the motor drives therotary shaft to rotate, and therefore, the winding disc rotates to drive spun cloth to wind; in a winding process of the spun cloth, the lower surface of the spun cloth is in contact with the surfaceof the supporting cushion, and the electric heating wire is arranged inside the supporting cushion for heating, so that the surface of the supporting cushion has certain temperature, and therefore, the spun cloth is dried; and meanwhile, a thermal light lamp above the spun cloth is used for drying the spun cloth through light energy radiation, so that the two sides of the spun cloth are dried simultaneously, and therefore, drying is more uniform.

The invention discloses a double-stirring-mode constant-temperature reaction device suitable for hydrolysis and saccharification of straw fibers. The double-stirring-mode constant-temperature reactiondevice comprises a shell, a first stirring assembly, a second stirring assembly, a temperature control assembly and a pH value regulation and control assembly, wherein a cavity is formed in the shelland used for containing materials; the first stirring assembly and the second stirring assembly correspondingly comprise a first stirring paddle and a second stirring paddle which are arranged in thecavity. By adopting the technical scheme, the double-stirring-mode constant-temperature reaction device suitable for hydrolysis and saccharification of straw fibers has the temperature and pH value control functions, thereby providing conditions for stable hydrolysis of straw fibers; by adopting the double-helix stirring structure, the second stirring paddle on the side surface can stir the materials up and down, thereby providing important guarantee for uniform distribution of the materials in the cavity; and the blades of the first stirring paddle on the bottom are in a blade shape, and canbreak the straw fibers, thereby reducing the particle size of the straw fibers and promoting hydrolysis of the straw fibers.

The invention provides a multifunctional LED light box for parks. The multifunctional LED light box comprises a box body, an LED lamp displayer, a rotating shaft, a power supply unit and a control unit. The rotating shaft is arranged on the upper portion of the box body in a parallel manner and is parallel to the bottom surface of the box body. The LED lamp displayer is arranged around the rotating shaft and is connected to the left side and the right side of the box body. The power supply unit comprises a solar electric panel, an accumulator and a driving motor, wherein the solar electric panel is arranged at the top of the box body, the accumulator is arranged on the inner side of the bottom of the box body and the driving motor is connected with the accumulator and the rotating shaft. The control unit comprises a temperature sensor and a water depth finder, which are connected with the LED lamp displayers. The multifunctional LED light box for parks has water depth and temperature alarm functions and is mainly installed on the sides of pools of parks to protect the safety of tourists and warn the tourists.

The invention relates to the technical field of air-conditioner heating, in particular to an electric heater. The metal ceramic hybrid PTC (Positive Temperature Coefficient) fast electric heater comprises a heating component, wherein the heating component is connected with two electrodes and comprises a heating ceramic plate and a metal PTC heating wire or strip; and one electrode is connected with one end of the heating ceramic plate, the other end of the heating ceramic plate is connected with one end of the metal PTC heating wire or strip, and the other end of the metal PTC heating wire or strip is connected with the other electrode. Due to adoption of the technical scheme, the metal ceramic hybrid fast electric heater not only has the advantages of stable performances, high efficiency, long service life, capability of being formed by bening and the like of a metal PTC electric heater, but also has the advantages of current limiting and temperature limiting of a ceramic PTC electric heater.

A rare-earth-doped ZnO nanocrystal temperature and humidity sensing material is a mono-dispersed nanometer spherical rare-earth-ion-doped ZnO nanocrystal material which is obtained by conducting a fast reaction on a ZnO raw material, erbium salt and ytterbium salt at the molar ratio of 100:2:20 and has temperature and humidity sensing properties. A peroration method of the material includes the following steps that the ZnO raw material, the erbium salt and the ytterbium salt are added into organic solvent diethylene glycol, then an obtained solution is charged into a microwave reactor with a reflux device, the solution is fast heated to 120-180 DEG C at the rate of 60-100 DEG C / min at normal pressure and kept at the temperature for 5 min, obtained turbid liquid is subjected to centrifugal separation, obtained nanocrystal powder is put into absolute ethyl alcohol to be subjected to ultrasonic treatment for 20 min, supernate is removed, and then drying is conducted for 2 h. The preparation method is simple in process, easy to implement, low in cost and high in speed, and the prepared mono-dispersed nanometer spherical rare-earth-doped ZnO nanocrystal has high temperature and humidity sensing properties.