530results about How to "Improve temperature stability" patented technology

A temperature control device includes a temperature detector, a difference operation unit, a controller, a saturation processing circuit unit, a rewritable storage unit, and a conversion unit. The difference operation unit operates a digital value corresponding to a difference value between a detected temperature value and a target temperature. The controller calculates a manipulated variable using the digital value operated by the difference operation unit. The saturation processing circuit unit includes a digital circuit to limit an output value of the controller to a pre-set upper limit value. The rewritable storage unit stores the upper limit value read from a storage area of the rewritable storage unit and input into the saturation processing circuit unit. The conversion unit converts the output value of the saturation processing circuit unit into an analog signal to output the converted value as a control command value to the heater.

The invention discloses a multi-stage temperature accurate control method based on a neural network algorithm, relates to the field of oven temperature control, and particularly comprises the steps of setting a final target temperature # imgabs0 #, and dividing a heating process of heating to the final target temperature # imgabs1 # into a rapid temperature rise stage, a temperature rise control stage and an accurate temperature control stage, an intermediate target temperature # imgabs2 # is set in each stage so as to gradually approach the final target temperature # imgabs3 #; according to the established oven system model, the influence of different intermediate target temperatures # imgabs4 # on temperature response is analyzed, and a proper intermediate target temperature # imgabs5 # combination is found; the heating temperature # imgabs6 # of the heating wire and the temperature # imgabs7 # in the oven are detected in real time through a temperature sensor, and then segmented control is conducted; through segmented control, the temperature rise rate and control precision of each stage are optimized, overshoot is reduced, the response speed is increased, the target temperature is gradually approached, and temperature overshoot caused by one-time large-amplitude temperature rise is avoided.

The invention relates to the technical field of elastomer materials, and discloses a preparation method of a high-temperature-resistant TPE thermoplastic elastomer material.The preparation method comprises the steps that a hydrogenated styrene-butadiene-styrene block copolymer SEBS, polypropylene, alkane naphthalene polystyrene grafted graphene and an antioxidant are blended and then subjected to melt extrusion and granulation in a double-screw extruder, and the high-temperature-resistant TPE thermoplastic elastomer material is obtained. The high-temperature-resistant TPE material is obtained; a polystyrene molecular chain containing an alkyl long chain and a naphthalene ring structure is introduced to the surface of graphene, so that graphene can be better dispersed in an elastomer material composed of SEBS and polypropylene, the tensile strength, the elongation at break, the hardness and the thermal weight loss temperature of the material are remarkably improved, and excellent mechanical properties and high temperature resistance are shown.

The invention discloses a halogen-free flame-retardant reinforced PBT (polybutylene terephthalate) composition as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The halogen-free flame-retardant reinforced PBT composition comprises polybutylene terephthalate, a halogen-free flame retardant, a melamine flame-retardant synergist, glass fibers, a phenol amide metal deactivator, a free radical trapping agent and a hydroperoxide trapping agent. According to the halogen-free flame-retardant reinforced PBT composition disclosed by the invention, under the combined action of all the components, the effects of improving the flame retardance, the ignition temperature of a glowing filament and the heat-resistant stability can be achieved, and the halogen-free flame-retardant reinforced PBT composition has relatively high mechanical properties. The flame retardant property of the halogen-free flame-retardant reinforced PBT composition reaches V-0 or above, the tensile strength is 95 Mpa or above, the glowing filament ignition temperature is 800 DEG C or above, and the thermal weight loss T1% temperature is 335 DEG C or above.

The invention relates to a temperature characteristic controllable multilayer ceramic dielectric capacitor and a preparation method thereof, the multilayer ceramic dielectric capacitor is formed by a dielectric layer A and a dielectric layer B through mutual staggered superposition and firing, the dielectric layer A is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide A, rare earth oxide B, silicon dioxide, calcium carbonate and zirconium oxide, and the dielectric layer B is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide A, rare earth oxide B, silicon dioxide, calcium carbonate and zirconium oxide; the dielectric layer B is composed of barium titanate, magnesium oxide, manganous-manganic oxide, vanadyl acetylacetonate, rare earth oxide C, rare earth oxide D, silicon dioxide, calcium carbonate, zirconium oxide and nickel oxide; the multilayer ceramic dielectric capacitor is formed by the dielectric layers A and the dielectric layers B in a staggered and stacked mode through firing, the combination of the double dielectric layers is different from a traditional single dielectric layer, and the capacitor has the advantages of being high in dielectric constant and high in temperature stability at the same time.

The invention discloses a TPMS structure-based phase change liquid cooling coupling battery thermal management device, and relates to the technical field of battery thermal management, the TPMS structure-based phase change liquid cooling coupling battery thermal management device comprises a plurality of battery packs, a battery box body, a first liquid cooling pipeline, a second liquid cooling pipeline and a plurality of cooling plates; the battery packs and the cooling plates are sequentially arranged in the battery box body at intervals; the cooling plate comprises a plate core and a shell, the plate core of a three-period minimum curved surface structure is arranged in the shell, and a liquid cooling area and a phase change cooling area which are isolated from each other are defined by the plate core and the shell. The liquid cooling area is communicated with a liquid cooling inlet and a liquid cooling outlet of the shell to form a liquid cooling channel, and is communicated with an external liquid cooling circulating device through a first liquid cooling pipeline and a second liquid cooling pipeline to realize liquid cooling; and a phase-change material is injected into the phase-change cooling area to realize phase-change cooling. According to the invention, the plate core with a small specific surface area and a three-period extremely-small curved surface structure is adopted to manufacture the cooling plate, so that effective coupling of liquid cooling and phase change cooling is realized, and high heat exchange efficiency and good temperature uniformity can be realized.

The invention discloses an integrated optical diversity receiving device, solves the problem of high power consumption when the influence caused by phase distortion and light beam pointing error is corrected in the existing free space optical communication, and belongs to the field of optical communication. The method comprises the steps that free space light focused by a lens is received by a multimode / few-mode optical fiber; the multi-mode light beams received by the multimode / few-mode optical fiber enter the photon lantern; the photon lantern is coupled to the single-mode fiber array after mode demultiplexing; each light beam in the single-mode fiber array enters a polarization beam splitting rotary combiner through an edge coupler; the polarization beam splitting rotation combiner performs transverse electric wave (TE) and transverse magnetic wave (TM) mode separation on the entered light beam, then rotates the separated TM polarization state light to a TE polarization state, combines the rotated TE polarization state light and the separated TE polarization state light, and then enters the MZI network; the MZI network is used for realizing optical coherent beam combination; a control circuit controls the merging of the light beams in the MZI network.

The invention relates to the technical field of electrolytic capacitors, in particular to a high-frequency rapid charge and discharge aluminum electrolytic capacitor for a servo motor and a manufacturing method, the high-frequency rapid charge and discharge aluminum electrolytic capacitor comprises an anode foil, a cathode foil, a capacitor shell and electrolyte, porous electrolytic paper is arranged between the anode foil and the cathode foil, and oxide film layers are arranged on two sides of the anode foil. A stable and compact oxidation film is generated on the surface of the anode foil through the phosphoric acid formation liquid, so that the anode foil can withstand high-current impact, and the charging and discharging speed is greatly improved. According to the high-frequency rapid charging and discharging aluminum electrolytic capacitor for the servo motor and the manufacturing method, the high-frequency rapid charging and discharging aluminum electrolytic capacitor for the servo motor has excellent rapid charging and discharging performance, high voltage resistance, good temperature stability, long service life, high reliability and good heat dissipation performance.

The invention relates to the technical field of ceramic materials, in particular to vanadium-based zircon microwave dielectric ceramic and a preparation method thereof.The vanadium-based zircon microwave dielectric ceramic is prepared from, by weight, Bi2O3, La2O3, CeO2, Nd2O3, Sm2O3 and NH4VO3, the chemical formula of the vanadium-based zircon microwave dielectric ceramic is (Bi < 0.2 > La < 0.2 > Ce < 0.2 > Nd0. 2Sm < 0.2 >) VO4, powder of Bi2O3, La2O3, CeO2, Nd2O3, Sm2O3 and NH4VO3 is obtained based on the components of the vanadium-based zircon microwave dielectric ceramic by weight, and original powder is obtained; stirring and mixing the original powder, performing wet grinding treatment and drying treatment to obtain dried powder, and pre-sintering the dried powder in the air atmosphere to obtain pre-sintered powder; a binder is added into the pre-sintered powder for granulation, compression molding is carried out, sintering is carried out in the air atmosphere, the vanadium-based zircon microwave dielectric ceramic is obtained, the vanadium-based zircon microwave dielectric ceramic has the near-zero resonant frequency temperature coefficient, the thermal stability of a device can be guaranteed, and the service life of the device is prolonged. The method is widely used for manufacturing microwave devices such as various dielectric antenna substrates, resonators and filters.

The invention provides a temperature control system for a radiation calibration device of an ultra-large-diameter infrared camera. The temperature control system comprises a meter-scale surface source blackbody radiation source, a temperature acquisition and control system, a heating plate group, a programmable power supply group, a low-temperature electromagnetic valve group, a liquid nitrogen supply system and an embedded control system, the temperature collection and control system collects the temperature of a radiation surface in real time through a temperature sensor and transmits the temperature to the control system, the temperature is compared with the set temperature, PID control is adopted, the refrigeration power and the heating power are controlled through two paths of output respectively, and the blackbody radiation source liquid nitrogen pipeline controls the meter-scale surface source blackbody radiation source through a plurality of low-temperature linear electromagnetic valves. The black body radiation source area is refrigerated; the programmable power pack controls the heating plate group to heat the blackbody radiation source area; the embedded control system realizes input and output of data, realization of a control strategy and remote transmission and communication of the data. The system can perform high-precision control and rapid measurement on the temperature of the black body, and improves the uniformity and stability of the meter-scale surface source black body.

The invention is suitable for the technical field of automobile shock absorbers, and provides an automobile adjustable damping shock absorber with a built-in electromagnetic valve and a characteristic modeling method thereof.The automobile adjustable damping shock absorber comprises a cylinder body, a lower base is fixedly installed at the lower end of the cylinder body, an air chamber assembly is installed on one side of the upper end of the lower base, and a connecting base is fixedly connected to the upper end of the inner wall of the cylinder body; the upper end of the connecting seat is in threaded connection with a connecting rod assembly, the lower end of the connecting seat is in threaded connection with an electromagnetic valve, the electromagnetic valve is connected with a piston assembly in a matched mode, the outer wall of the cylinder body is fixedly sleeved with a spring seat, a gasket is placed at the upper end of the spring seat, and a third spring is fixedly arranged between the gasket and the connecting rod assembly. The shock absorber has the advantages that the shock absorption capacity of the shock absorber is improved, the structure is optimized to enhance the temperature stability, the electromagnetic force and damping force output is stabilized, the action time lag and flutter of the valve element are reduced, the design period is shortened, and the development cost is reduced.

The invention provides a sandwich multi-layer high-entropy lead-free dielectric material and a preparation method thereof, belongs to the technical field of energy storage ceramics, and aims to solve the technical problems that multi-layer ceramics are not compact in sintering, low in breakdown-resistant field strength and relatively low in energy storage performance. The sandwich multilayer high-entropy lead-free dielectric material comprises an upper dielectric layer, a lower dielectric layer and a middle high-entropy dielectric ceramic layer, the upper dielectric layer and the lower dielectric layer are both made of Mg2SiO4, and the high-entropy dielectric ceramic layer is made of Ba < 0.2 > Sr < 0.2 > Na < 0.2 > Bi < 0.2 > Ca < 0.2 > Ti < 0.25 > Ti < 0.25 > Nb < 0.25 > Zr < 0.25 > Mg < 0.25 > O < 3 >. The sandwich multi-layer high-entropy lead-free dielectric material prepared by the method has relatively high density, relatively high breakdown-resistant field strength, relatively high dielectric property, relatively high energy storage density and good discharge efficiency, the breakdown-resistant field strength reaches 1200 kV / cm, the maximum energy storage density reaches 6 J / cm < 3 >, and meanwhile, the sandwich multi-layer high-entropy lead-free dielectric material has relatively good temperature stability. The method has the advantages of simplicity, feasibility, low cost, convenience, rapidness, large-scale production and the like.

The invention discloses a lead-free energy storage ceramic laminated material, and belongs to the technical field of dielectric energy storage. The lead-free energy storage ceramic laminated material is formed by sequentially laminating lead-free energy storage ceramic with a texture structure and lead-free energy storage ceramic with a non-texture structure, and preferably, the material comprises at least three layers; when the lead-free energy storage ceramic with the texture structure is positioned on the middle layer, the lead-free energy storage ceramic with the non-texture structure is positioned on the two sides of the middle layer; when the lead-free energy storage ceramic with the non-texture structure is located on the middle layer, the lead-free energy storage ceramic with the texture structure is located on the two sides of the middle layer. Based on the structural design of at least three layers, the non-textured ceramic is selected as the high-voltage-resistant layer, the textured ceramic is selected as the high-polarization layer, the lead-free ceramic laminated material with excellent energy storage performance is obtained, and the lead-free ceramic laminated material has wide application prospects in the fields of power electronics and pulse power.

According to the feedback control circuit, the control method and the switching power supply applying the feedback control circuit, a secondary side controller serves as a main controller, and a current generation and mirror image module and a control signal generation module are arranged in the secondary side controller; the current generation and mirroring module generates a first current based on the output voltage or the signal representing the output voltage and the first voltage signal, and mirrors the first current into a second current; the control signal generation module generates a control signal based on the second current; and the secondary side controller realizes feedback control of the loop based on the control signal. Through the arrangement, an optocoupler is not needed, the current mirror image module can be compatible with an existing peripheral circuit structure, the structure is simple, and the transmission delay of the current mirror image module is far smaller than that of the optocoupler, so that unnecessary poles can be reduced, and a corresponding compensation network structure can be simplified; and the current mirror image module has better current and temperature stability and smaller temperature excursion, so that the light attenuation effect of an optocoupler can be avoided, and the service life of the current mirror image module is longer.

The invention discloses a hemispherical resonator gyroscope scale factor self-compensation system and method. An X-axis electrode and a Y-axis electrode are respectively connected with a buffer amplifier, an analog-to-digital converter and a demodulation unit through switches; one output of the demodulation unit is connected with the excitation signal demodulation unit and the scale factor compensation unit, the other output of the demodulation unit is connected with the control unit through the low-pass filtering unit, the output of the control unit is connected with the scale factor compensation unit and the two signal modulation units, and the two signal modulation units are respectively connected with an X-axis electrode and a Y-axis electrode through the digital-to-analog converter; and the output of the excitation signal generator is connected with the Y-axis signal modulation unit and the excitation signal demodulation unit. A Y-axis sine excitation signal response amplitude is extracted through an excitation signal demodulation unit, and a scale factor change relation can be obtained according to a ratio relation between the amplitude and an amplitude reference value. According to the invention, the self-compensation of the scale factor can be completed, the problem that the performance of the gyro scale factor is reduced due to temperature change and aging is solved, and the temperature stability and long-term working stability of the gyro scale factor are improved.

The invention discloses a structure-decoupled capacitive MEMS six-dimensional force sensor chip and a preparation process thereof, the structure-decoupled capacitive MEMS six-dimensional force sensor chip comprises a top pole plate, a first outer frame and a bottom pole plate, and the first outer frame is located at the outer side of the top pole plate; the top pole plate comprises an upper electrode and silicon columns, and the silicon columns are distributed in the middle of the upper electrode; the bottom pole plate comprises a base body, a lower electrode, anchor points and a bonding pad, the anchor points are distributed in the middle of the lower electrode, and the positions of the anchor points correspond to the positions of the silicon columns. The device has the advantages of full-dimensional physical structure decoupling, small size, high sensitivity, small temperature influence and easiness in manufacturing, and is suitable for severe working environments, such as mechanical hand fingertips, micro medical robots and the like, with small mounting and working spaces and sharp temperature and humidity changes.

The invention discloses a piezoelectric type macro-micro force sensing device and a measurement method, solves the problem that an existing force sensor is difficult to meet quasi-static measurement of micro force, and belongs to the technical field of macro-micro force measurement. Two force measuring units with piezoelectric ceramics as sensitive elements and a piezoelectric quartz reference unit with a piezoelectric quartz wafer as a sensitive element are used as sensors, the piezoelectric quartz reference unit is used for measuring macroscopic force, the force measuring units are used for measuring micro force, and continuous quasi-static measurement of the micro force can be realized through alternation of the two force measuring units. The resolution of the sensor is improved by utilizing the characteristic of high sensitivity of piezoelectric ceramics; and the stability of the sensor is improved by utilizing the characteristics of good linearity, high temperature stability and no hysteresis of piezoelectric quartz. Two indexes of high precision and wide range of the force sensor can be considered, multi-range quasi-static macro-micro force measurement is realized, and the force sensor has the advantages of high rigidity, high frequency response and the like.

The utility model discloses a novel capacitive MEMS pressure sensor, which comprises a sensitive structure layer, a bonding layer and a bottom plate layer which are sequentially arranged from top to bottom, and a closed vacuum cavity is defined by the sensitive structure layer, the middle part of the bottom plate layer and the bonding layer; the sensitive structure layer comprises a sensitive layer frame and a sensitive layer capacitance plate, and the bottom plate layer comprises a bottom layer outer frame and a bottom layer capacitance plate; the middle parts of the sensitive layer frame and the bottom layer outer frame are correspondingly provided with a sensitive layer capacitance plate and a bottom layer capacitance plate respectively; the peripheral side of the sensitive layer capacitance plate is connected with the sensitive layer frame through a sensitive layer elastic film; a capacitance gap located in the vacuum cavity is formed between the sensitive layer capacitance plate and the bottom layer capacitance plate. Deformation under the action of external pressure mainly occurs at the elastic thin film, the deformation quantity of the sensitive layer capacitance polar plate is small, the linearity between the capacitance value variation and the air pressure or pressure variation is effectively improved, and good practicability is achieved.

The invention relates to the technical field of aluminum alloy materials, in particular to an aluminum alloy material, an aluminum alloy conductor wire core and a preparation method and application of the aluminum alloy conductor wire core. The aluminum alloy material comprises, by mass, 0.3%-1.0% of iron (Fe), 0.03%-0.2% of magnesium (Mg), 0.1%-0.8% of manganese (Mn), 0.08%-0.3% of zirconium (Zr), 0.004%-0.03% of boron (B), 0.015%-0.65% of rare earth (RE), 0-0.12% of silicon (Si) and the balance aluminum (Al) and inevitable impurities, the single impurity is not larger than 0.03%, and the sum of the impurities is not larger than 0.1%. Wherein the rare earth (RE) is prepared from the following components in percentage by mass: 0.003 to 0.1 percent of lanthanum (La), 0.004 to 0.15 percent of cerium (Ce) and 0.008 to 0.4 percent of scandium (Sc). The prepared aluminum alloy material has the characteristics of high conductivity, high strength, heat resistance, corrosion resistance and good fracture and impact toughness, is very suitable for being used as a cable conductor, and is particularly applied to places with high requirements on high temperature, vibration, movement, corrosion and the like, such as power cables, electrical connecting wires, drag chain cables applied to metal smelting places and the like.

The invention belongs to the technical field of pyroelectric infrared detection, and particularly relates to a high Curie temperature lead-based pyroelectric material and a preparation method thereof, the chemical composition of the high Curie temperature lead-based pyroelectric material is Pb (Zr0. 9Ti0. 1) O3-xK2CO3, and x is more than or equal to 0.0 and less than or equal to 1.5% (mol). K2CO3 is doped into a PZT substrate, K < + > enters a crystal lattice and then replaces Pb < 2 + > at an A site to form an oxygen vacancy, polarization overturning is hindered, and the dielectric constant and the dielectric loss are reduced. As the radius of K < + > is larger than that of Pb < 2 + >, lattice distortion is further intensified, the polarization characteristic of the material is improved, and the material shows high pyroelectric performance and good temperature stability. In order to avoid element volatilization and reduce the sintering cost, a microwave sintering method is adopted, and the high-Curie-temperature lead-based pyroelectric ceramic material with good consistency can be efficiently prepared at low cost through process adjustment.

The invention relates to an intelligent photovoltaic curtain wall which has the function of adjusting light transmission intensity. The surface of the photovoltaic curtain wall is fully covered by the photovoltaic module, the supporting body is installed behind the photovoltaic battery module, and the photovoltaic module is fixed on the supporting body through the module fastener. Air hole channels are arranged among the photovoltaic modules to adjust temperature, and air holes can be connected with external constant-temperature systems such as a central air conditioner, so that the photovoltaic curtain wall has good constant-temperature capability. The photovoltaic cell is located between the guide rails, and the controller controls the driving motor to achieve movement of the cell position, so that the light transmission intensity is adjusted in good time. A mechanical arm and a control motor are arranged in the photovoltaic cell storage box and used for storage and output of photovoltaic cells, and the control motor receives instructions of the controller to operate. The controller is connected with the driving motor and the control motor through data lines, the shielding area ratio of the photovoltaic cell is automatically adjusted according to user requirements, and automatic adjustment of the light transmission intensity is achieved.

The invention discloses high-strength high-storage-stability temperature-sensitive phase-change reversible hydrogel and a preparation method thereof, and belongs to the technical field of preparation of hydrogel. The temperature-sensitive phase-change reversible hydrogel with high strength and high storage stability is prepared by taking poly (N-isopropylacrylamide) as a matrix, gelatin grafted gallic acid as an entanglement agent, polyvinyl alcohol as a deconstruction agent and deionized water as a solvent through low-temperature stirring. The hydrogel prepared by the invention has higher phase change temperature and storage stability, better mechanical properties, excellent biocompatibility, temperature-sensitive phase change property and temperature-sensitive phase change reversibility, is non-toxic, injectable and degradable, is simple in preparation method, is mainly used in the fields of medical treatment and cosmetology, and has remarkable economic value and social benefit.

The invention discloses a dielectric ceramic material and a preparation method thereof, and relates to the technical field of dielectric ceramic materials, and the technical key points are as follows: the dielectric ceramic material comprises barium titanate (BaTiO3) which accounts for 80-99 wt% of the weight of the finished dielectric ceramic material; the dielectric ceramic material also comprises a dopant, and the dopant accounts for 1-20wt% of the weight of the dielectric ceramic material finished product. The doping agent comprises silicon dioxide (SiO2), magnesium carbonate (MgCO3), manganous-manganic oxide (Mn3O4), barium titanate (BaCO3) and rare earth oxide D2O3; wherein D represents any one or more of yttrium (Y), holmium (Ho), ytterbium (Yb), gadolinium (Gd) and dysprosium (Dy); the invention provides a dielectric ceramic material which meets the EIAX7R standard and still has a high IR characteristic and a low dielectric loss factor (tan delta) in a high-temperature environment and a preparation method of the dielectric ceramic material.

The invention discloses a high-power-supply-rejection-ratio band-gap reference circuit with base current correction and high-order temperature compensation, which comprises a pre-voltage-stabilizing circuit module used for generating and outputting internal power supply voltage according to external power supply voltage, the internal power supply voltage is supplied to the band-gap reference core circuit module so as to isolate transmission of power supply noise to reference output; the high-order temperature compensation circuit module is used for generating nonlinear compensation current according to the bias voltage; the band-gap reference core circuit module is used for generating current in direct proportion to absolute temperature, reference voltage and reference output voltage based on internal power supply voltage and feeding back the reference voltage to the pre-voltage-stabilizing circuit module to serve as bias reference; and the base current correction circuit module is used for sampling the base current of the bipolar transistor in the band-gap reference core circuit module. On the premise that the circuit structure and the power consumption are reasonable, the temperature drift of the reference voltage is reduced, and the power supply suppression capability is improved.

The present invention discloses Streptomyces SC-3 and its composition and use. The Streptomyces SC-3 strain is deposited in China Center for Type Culture Collection with the deposit number CCTCC NO:M 2024906. The present invention finds that the Streptomyces SC-3 strain itself has high efficiency and broad-spectrum antibacterial activity, and finds that the Streptomyces SC-3 strain has a significant antagonistic effect on kiwifruit soft rot bacteria. It is verified by indoor experiments that the speed of kiwifruit fruit decay caused by Phomopsis can be slowed down. Its fermentation liquid has good temperature stability, and a variety of antibacterial substances are identified from its sterile fermentation liquid, including antibiotics such as antimycin, tetramycin, candidacidin, streptomycin, etc., which are widely used in biological control. The speed of fruit decay caused by the infection of Botrytis cinerea after inoculation can be effectively inhibited.

The invention provides a phenylalkylfluorene-substituted naphthalene ring arylamine compound and a preparation method and application thereof, and belongs to the field of organic electroluminescent materials, the phenylalkylfluorene-substituted naphthalene ring arylamine compound has a structure as shown in a formula 1 or a formula 2, the parent nucleus of the compound is that arylamine and a 9-alkyl-9-phenylfluorenyl derivative group are subjected to ortho-position substitution in the same aromatic ring of a naphthalene ring, the naphthalene ring has a relatively strong pi conjugation effect and a relatively large delocalization area, and naphthyl is more favorable for increasing the distribution of holes in molecules and enhancing the hole transmission capability of the material; the ortho-position connection steric hindrance of the naphthalene ring and the aromatic ring as shown in the invention is proper, so that the intermolecular interaction is weakened, and the compound has the characteristics of difficulty in intermolecular crystallization, difficulty in aggregation and good film-forming property, has high glass transition temperature and thermal stability, and prolongs the service life of an OLED (Organic Light Emitting Diode) device; and the efficiency can be improved by the introduced sp3 hybrid functional group of the 9-alkyl-9-phenylfluorenyl derivative.

The invention provides a refrigeration optimization system and a refrigeration optimization method of a low-temperature mechanical testing machine, and relates to the technical field of refrigeration, the refrigeration optimization system comprises a testing machine main body, a test box, a self-pressurization liquid nitrogen tank and a temperature control device; the test box is placed on the testing machine main body; a to-be-tested sample is placed in the test box, and a low-temperature environment is provided for the to-be-tested sample through the test box; one end of the self-pressurization liquid nitrogen tank is communicated with one side of the test box, and the self-pressurization liquid nitrogen tank is used for providing cold source liquid nitrogen for the test box; the temperature control equipment is arranged in the test box and is in communication connection with an upper computer, and the temperature control equipment monitors the temperature in the test box in real time and feeds back the temperature to the upper computer in real time, so that the flow rate of cold source liquid nitrogen supplied to the test box by the self-pressurization liquid nitrogen tank is adjusted in real time, and then the temperature of the test box is controlled. According to the scheme, the refrigeration efficiency and the temperature stability of the whole system are improved.

The invention discloses immobilized lipase with sponge as a carrier and preparation and application of the immobilized lipase, belongs to the technical field of enzyme engineering, and provides a preparation method of the immobilized lipase with the sponge as the carrier, and the preparation method comprises the following steps: soaking the sponge in a silane coupling agent, and drying for the first time to obtain modified sponge; and mixing the modified sponge with glutaraldehyde and a lipase solution, standing, eluting, and drying for the second time to obtain the immobilized lipase. The modified sponge immobilized lipase which is high in enzyme loading capacity, high in catalytic efficiency, good in environmental stability and high in repeated use frequency is constructed.

The invention relates to the field of industrial heating, in particular to a hot air generating device of a low-temperature tempering furnace. The technical problem to be solved is to overcome the defects of heat waste of waste gas and unstable hot air temperature. According to the technical scheme, the device comprises a first shell, one side of the first shell is fixedly connected with a second shell in a communicating mode, one side of the second shell is provided with an air outlet hole, the other side of the first shell is provided with a mounting hole, one end of the mounting hole is fixedly connected with a T-shaped cylinder, one end of the T-shaped cylinder is fixedly connected with a high-speed nozzle, and the outer side of the high-speed nozzle is sleeved with a heat insulation plate; and a spark head is arranged on one side of the high-speed nozzle. The burner has the beneficial effects that the direction of waste gas is guided through the wind shield and the flow guide plate, combustible substances in the waste gas are ignited at the high-speed nozzle through the spiral gas channel of the ventilation ring, the basic temperature of fuel gas and a combustion improver is increased through heat of the waste gas, fuel gas needed for generating high-temperature gas is reduced, and the utilization rate of the fuel gas is increased.

The invention belongs to the field of refractory materials, and particularly relates to a low-chromium magnesite-chrome brick with high high-temperature flexural strength and a preparation method thereof.The low-chromium magnesite-chrome brick is prepared from raw materials including fused magnesite particles, fused magnesite fine powder, high-purity magnesite particles, chromium concentrate particles, chromium concentrate fine powder, high-purity magnesite fine powder and nano yttrium oxide, and a binding agent and lime milk are additionally added; the preparation method comprises the steps of pretreatment, wet grinding, forming and drying, coating and sintering. The process is simple, the product with good performance can be prepared, the chromium content in the product is reduced, the product is more environmentally friendly while the original advantages are kept, the high-temperature breaking strength, the high-temperature refractoriness under load and the thermal shock stability of the product are improved, and the breaking strength of the product at the high temperature of 1850 DEG C reaches 5.5-6.5 MPa.