48results about How to "Good temperature stability" patented technology

The invention relates to an integrated electric field sensor based on common path interference, and belongs to the technical field of electric field measurement. The sensor comprises a lithium niobate substrate, a silicon substrate, a gasket, a probing unit and a modulation unit, wherein the lithium niobate substrate and the silicon substrate are adhered and connected with each other through ultraviolet curing glue and are respectively adhered an connected with the gasket through the ultraviolet curing glue, the probing unit comprises two upper contact electrodes, a connecting wire and two dipole antennae, and the modulation unit comprises two lower contact electrodes, an optical wavegudie and two modulation electrodes. With the adoption of the electric field sensor, the temperature stability is good; on the basis of ensuring that the size of the sensor is small, the sensitivity and a dynamic range of the electric field measurement are obviously improved; and according to the two-dimension electric field sensor designed by the invention, the axial directions of two pairs of antennas in the probing unit are orthogonal and combined with the modulation unit, thus realizing the two-dimension electric field measurement.

The present invention discloses a magnetoresistive gear tooth sensor, which includes a magnetoresistive sensor chip and a permanent magnet. The magnetic sensor chip is comprised of at least one magnetoresistive sensor bridge, and each arm of the sensor bridge has at least one MTJ element group. The magnetoresistive gear tooth sensor has good temperature stability, high sensitivity, low power consumption, good linearity, wide linear range, and a simple structure. Additionally, the magnetoresistive gear tooth sensor has a concave soft ferromagnetic flux concentrator, which can be used to reduce the component of the magnetic field generated by the permanent magnet along the sensing direction of the MTJ sensor elements, enabling a wide linear range. Because it is arranged as a gradiometer, the magnetoresistive gear tooth sensor bridge is not affected by stray magnetic field; it is only affected by the gradient magnetic field generated by gear teeth in response to the permanent magnet bias. The magnetoresistive gear tooth sensor of the present invention is able to detect the position of a specific tooth or a missing tooth of a gear. This magnetoresistive gear tooth sensor is also capable of determining the speed and direction of motion of a gear.

The present invention relates to the field of well drilling, and discloses a primary emulsifier and a preparation method therefor, an emulsifier composition and an application thereof, and oil-based drilling fluid. The primary emulsifier comprises an amide compound and a fatty acid compound; the amide compound comprises at least one amide group, at least one unsaturated double bond, and at least one alkyl containing 14-30 carbon atoms; and the fatty acid compound comprises 20-80 carbon atoms. When the primary emulsifier is used for drilling fluid base mud, the primary emulsifier has a good emulsifying effect and excellent temperature resistance. In addition, the synthetic materials of the primary emulsifier provided by the present invention are widely available and inexpensive, non-fluorescent, and environmentally friendly, and thus the primary emulsifier has great prospects for industrial applications.

The invention relates to an environmental protection type full-nutrition organic cultivation media, which is characterized by comprising, by weight, 63-75% of grass charcoal with humic acid content of more than 20%, 3-5% of expanded vermiculite particles, 3-5% of 40-60 mesh eggshell powder, 3-5% of 40 mesh kelp powder, 3-5% of 60-80 mesh maifanite powder, 1% of zinc sulfate, 0.5% of borax, 0.5% of ammonium molybdate, 1% of copper sulfate, 2% of EDTA-Fe, 2-3% of 60-80 mesh selenium-rich slime, 2-3% of 60-80 mesh rare earth slime, 2-3% of volcanic lava particles with a particle size of 3-15 mm, and 2-3% of expanded ceramsite. The preparation process comprises: (1) raw material grass charcoal selection; (2) acid extraction and aging treatment of grass charcoal; (3) raw material matching and mixing stirring (4) ripening and disinfection treatment; (5) organic nutrient supplement and bacterial complement treatment; and (6) low-temperature drying and packaging. The product completely utilizes the unique advantages of nature, safety, environmental protection, nutrition, water retention and the like, and can be widely used in the fields of ecological cultivation, soil improvement, home gardening and the like. In addition, the production method is simple and is suitable for industrial production.

The invention provides a tin-doped lead lanthanum zirconate titanate thick film ceramic and its preparation and application thereof, and belongs to the technical field of energy storage ceramic materials. The tin-doped lead lanthanum zirconate titanate thick film ceramic has a chemical composition conforming to the chemical formula Pb0.94La0.06(Zr0.95-xSnxTi0.05)0.985O3, wherein 0.05<=x<=0.15. Thepreparation method comprises the following steps: (1) weighing raw materials in proportion, mixing, ball milling, drying, sieving, calcining to obtain a sintered product; (2) subjecting the sinteredproduct to high-energy ball milling, drying and sieving to obtain fine powder; (3) mixing the fine powder in a dispersing agent and a solvent and barrel finishing, adding a dispersing agent, a binder,a solvent and a plasticizer, and barrel finishing to obtain a casting slurry; (4) casting the casting slurry to obtain a thick film green body, sintering, and obtaining the finished product. The tin-doped lead lanthanum zirconate titanate thick film ceramic can withstand the electric field strength of 400 kV/cm, and obviously increases the energy storage density and energy storage efficiency of the thick film of ceramics, and has wide application prospects.

The present invention relates to the field of drilling fluid, and discloses a co-emulsifier and a preparation method therefor, an emulsifier composition and an application thereof, and oil-based drilling fluid. The co-emulsifier comprises at least two amide groups and at least one hydrocarbon group comprising 7-30 carbon atoms. When the co-emulsifier is used in drilling fluid based slurry, good emulsifying effect and temperature resistance stability are obtained, and the system stability after aging is enhanced. Moreover, synthetic raw materials for the co-emulsifier provided by the present invention are widely available, inexpensive and free of fluorescence, and do no harm to the environment, thereby having a high industrial prospect.

The invention discloses a mortar-coated heat-preserving plate which comprises a base plate. Glass fiber cloth layers are attached to the upper end face and/or the lower end face of the base plate. Mortar layers are arranged on the glass fiber layers on the upper end face and/or the lower end face in a coated mode, mortar comprises 33-37 parts of silicate cement, 6-7 parts of brucite fibers, 23-27 parts of expanded perlite, 0.3 part of hydroxypropyl methylcellulose, 0.1 part of polypropylene fibers, 0.5 part of calcium stearate, 17-26 parts of modified aerogel particles and 0.3-0.6 part of a promoter. The modified aerogel particles are prepared due to the fact that a surface modifier is sprayed on the surfaces of aerogel particles for surface modification. The heat-preserving mortar is made of inorganic materials, is resistant to acid, alkali and corrosion, does not crack or disengage, is high in stability, is identical to a building wall in service life, and has excellent temperature stability and chemical stability. Surface modification is carried out on the aerogel particles, so that the physical property that the aerogel particles are easy to break and can be easily combined with water is overcome, the heat conductivity of the surface-modified aerogel heat-preserving mortar reaches below 0.04W/m.K, and the heat-preserving effect of the heat-preserving mortar is improved.

The invention discloses an X8R ceramic capacitor ceramic material and a preparation method thereof. The ceramic material comprises BaTiO3 used as a main component and Bi4Ti3O12 and low-temperature CBS glass powder used as auxiliary components. The preparation method comprises the following steps: adding the Bi4Ti3O12 and CBS glass powder in a powder form into the BaTiO3 powder, then uniformly mixing in a ball mill, drying, granulating, and sintering, wherein the molar ratio is based on BaTiO3 + xBi4Ti3O12 + CBS glass powder, x = 0.01-0.05, and the amount of the CBS glass powder accounts for 0-10wt% the total mass of the ceramic material. The ceramic material can be co-sintered with base metals at medium temperature, has X8R temperature characteristics, and has the advantages of simple preparation process, low price and environment friendliness.

The invention relates to a semiconductor refrigerator closed-loop control method applied to a space environment and belongs to the spaceflight optical remote sensor technical field. The method includes the following steps that: a bridge type series circuit is adopted to acquire the current temperature V1 of the focal plane of a detector; the difference of a characterization parameter V1 of the current temperature of the focal plane of the detector and a characterization parameter V2 of the target temperature of the focal plane of the detector is obtained and amplified through an operational amplifier, and then is transmitted to a PID control circuit, so that control voltage can be obtained; and the control voltage outputted by the PID control circuit is transmitted to a driving circuit, and the driving circuit controls current passing through a semiconductor refrigerator, so that refrigeration can be performed for the focal plane of the detector. According to the closed-loop control circuit adopted by the method of the invention, bridge type series resistors are adopted to measure the temperature of the focal plane of the detector; at a temperature control point, the reaction of divided voltage to variation of the resistance value of a thermistor caused by temperature is most sensitive, wherein the resistance value at the temperature control point is selected, and therefore, measurement errors can be decreased, and high-precision measurement can be realized, and thus, high-precision control can be realized.

The invention provides a high-performance microwave dielectric film having the structural formula of (1-x)BaTiO3-xNaNbO3, wherein the value range of x is between 0.025-0.075, the preparation consists of weighing BaCO3, TiO2, Na2CO3 and Nb2O5 powder according to the structural formula of (1-x)BaTiO3-xNaNbO3, carrying out ball grinding and drying treatment, pressing the powder into sheets with a pressure of 1-35MPa, loading the powder corresponding to sheets to be sintered into Al2O3 crucible, sealing the sheets and powder, placing the crucible into heating-furnace, elevating temperature to 800-1000 deg. C than thermal insulating 10-60 minutes, then elevating temperature again to sintering temperature, sintering for about 100-300 minutes at 1300-1650 deg. C, obtaining the corresponding ceramics, placing the corresponding ceramic sheets onto the growth chamber of the impulse deposition system, ablating the ceramics with KrF excimer pulsed laser, and depositing the spatters onto the substrates, thus preparing thin film with the thickness of 200-600nm.

The invention provides a permanent magnetic synchronous motor, which at least comprises a motor case (1), a stator iron core (4), a stator armature winding (3), a rotor protective sleeve (4) and a rotor permanent magnet (5), wherein the rotor permanent magnet (5) is arranged in the rotor protective sleeve (4), and in addition, the rotor protective sleeve (4) firmly covers the rotor permanent magnet (5) through the heating interference fit.

The invention discloses a temperature-sensitive type polymer and a preparation method thereof. According to the preparation method of the polymer, reaction temperature is controlled and salt concentration, pH (Potential of Hydrogen) value and polymer concentration of a polymerization reaction solution are controlled to prepare the temperature-sensitive type polymer with different lower critical solution temperatures (LCST). The temperature-sensitive type polymer is used as a drilling fluid additive and can improve the low-temperature rheological property of water-based drilling fluid; the changes of the plastic viscosity and the apparent viscosity within a range of 0 to 60 DEG C are reduced by 50 percent. A preparation process of the temperature-sensitive type polymer is simple and feasible and the preparation efficiency is high; the temperature-sensitive type polymer has an excellent temperature-sensitive behavior in the deep-water water-based drilling fluid; the low-temperature rheological property of the water-based drilling fluid can be extremely improved, so that the preparation method of the temperature-sensitive type polymer and the temperature-sensitive type polymer prepared by the preparation method have actual application value in a petroleum industry, especially a deep-water well drilling field.

The invention relates to tin barium titanate calcium leadless piezoelectric ceramic with excellent piezoelectric property and good temperature stability. The tin barium titanate calcium leadless piezoelectric ceramic is characterized by comprising a material (Ba[1-x]Cax)(Ti0.95Sn0.05)O3, wherein x is 0-0.07; in a component interval of 0.01-0.06, the the piezoelectric constant d33 of the ceramic of the system is more than 4000pC/N; the electromechanical coupling coefficient kp of the the piezoelectric constant d33 is more than 41%, so the performance of the traditional piezoelectric ceramic containing lead is achieved; in addition, the piezoelectric constant d33 of the ceramic and the electromechanical coupling coefficient kp have good temperature stability; the piezoelectric constant d33 and the electromechanical coupling coefficient kp can respectively achieve over 3000pC/N and 30% when x is 0.01-0.06; and the tin barium titanate calcium leadless piezoelectric ceramic displays that the material has good application prospect.

The invention discloses a recycled aggregate total pervious concrete pavement structure and a construction method thereof. The pavement structure comprises a pervious cushion ply, a pervious base layer, a pervious surface layer and a pervious cover layer paved from bottom to top; the pervious cushion ply is made from natural gravels; the pervious base layer and the pervious surface layer are recycled aggregate total pervious concrete; and the pervious cover layer is pervious concrete prepared from a aggregate. The pavement structure disclosed by the invention is relatively good in water permeability and wear resistance.

The invention relates to a novel large-wrapping sensing fiber and a fiber sensing ring thereof. The fiber is formed by twisting a long beat length polarized photonic crystal fiber from beginning to end, and the minimum pitch of the fiber after twisting is between 0.2 and 2mm. A wrapping of the fiber is between 300-800[mu]m. The sensing ring comprises a quartz substrate layer, a sensing fiber, a quartz upper wrapping, an external protection skeleton and the like. The ultra-fast laser processing technology is used to perform overall shaping of the integrated sensing fiber. After the stress is released by annealing, the rough part is grinded. A central through hole is drilled, and is placed in the external protection skeleton for fixed packaging. The expansion coefficient of the quartz substrate layer is close to that of the fiber. After the sensing ring is packaged, influences of external temperature and vibration on the integrated fiber polarization are reduced, and the integrated fiber is effectively fixed and protected. The manufacturing precision is high, and the usage is convenient.

The invention relates to a cement foaming fireproofing insulation board which is characterized in that 600# cement, sulphoaluminate rapid hardening cement, powdery carbonized rice husk, cement foaming master batch, polypropylene fiber, water with the temperature of 35 DEG C to 40 DEG C and hydrogen peroxide are adopted as raw materials; and the cement foaming fireproofing insulation board is prepared by adopting the following process steps of: placing the materials in a stirrer to mix and stir uniformly; adding the hydrogen peroxide to oxidize; pouring the mixture into a die for foaming molding and natural withering; cutting to specification shapes; and detecting and packaging. After testing, the cement foaming fireproofing insulation board has the characteristics of terrific temperature stability and chemical stability, acid-base resistance, no cracking, no falling, high stability, no aging, greening, environment protection, harmlessness, fire resistance, no combustion, good safety, high strength, high bonding strength with a base layer of a building, no crack and hollowing and same life with a building body. The construction is simple and convenient, the comprehensive cost is low, the construction period is short, the quality is good, the application scope is wide, and the cement foaming fireproofing insulation board can be used for insulation of the external wall and also used for internal insulation of the external wall, or simultaneous insulation of the internal wall and the external wall.

The invention discloses a temperature-stable high-dielectric-constant dielectric ceramic Ba6Ti3Zr5Nb8O42 and a preparation method thereof. The preparation method comprises the following steps: (1) weighing and proportioning BaCO3, TiO2, ZrO2 and Nb2O5 original powders with the purity of higher than 99.9 wt% according to the composition of the Ba6Ti3Zr5Nb8O42; (2) carrying out wet ball milling mixing on the raw materials in the step (1) for 12 hours by using distilled water as a ball milling medium, drying, and presintering in a 1300-DEG C atmospheric atmosphere for 6 hours; and (3) adding an adhesive into the powder prepared in the step (2), granulating, compacting, and finally, sintering in a 1350-1400-DEG C atmospheric atmosphere for 4 hours, wherein the adhesive adopts a 5 wt% polyvinyl alcohol solution, and the addition amount of the polyvinyl alcohol is 3% of the total mass of the powder. The ceramic has favorable sintering property, the dielectric constant reaches 81.3-83.9, the quality factor Qf value is up to 34000-42000 GHz, the temperature coefficient of resonance frequency is small, and the ceramic has great application value in industry.

A resonant tunneling micro sound transducer is prepared as fabricating out resonant tunneling piezo ¿C resistance on super lattice film, fabricating super lattice film substrate to be force transmission structure of indent resonant cavity and setting four resonant tunneling piezo ¿C resistances on edge of indent resonant cavity. The said transducer is actually a quantum component prepared by MEMS process.

The invention discloses a self-healing optical current transformer, which relates to a current transformer and is disclosed so as to solve the problems that a traditional optical current transformer has low measurement accuracy, low temperature stability and low reliability after running for a long time. An optical current sensor and a self-healing corrector are arranged on an electric power transmission bus; the data signal output ends of the optical current sensor and the self-healing corrector are respectively connected with the data signal input ends of a digital signal demodulation module and a power frequency filtering module in an algorithm realizing unit; the signal output end of the digital signal demodulation module is respectively connected with the signal input ends of the power frequency filtering module and a factor correction module; and the data signal input end and the data signal output end of a fault judgment module are respectively connected with the data signal output end of the power frequency filtering module and the data signal input end of the factor correction module. The self-healing optical current transformer has the advantages of high measurement accuracy, high temperature stability and high reliability.

The invention relates to an efficient and controllable constant current source circuit. The circuit comprises n triodes, n-1 resistors and n-3 paths of loads, wherein n is a natural number which is more than 3; and the two triodes are packaged in a geminate transistor and have the same working environment. Because an emitter junction of one triode provides a bias voltage for the other triode to compensate the temperature influence, a constant current source has favorable temperature stability performance; because the current of a control end of the constant current source is very low and a majority of current passes by the loads, the working efficiency of the constant current source is higher; because the triode at the control end works in the two states of the triode and the diode, the constant current source is flexibly controlled by utilizing a digital mode; and because parameters of the four triodes are not strictly required, the constant current source can be realized by utilizing a parse element.

The invention discloses a super-tough and low-dry shrinkage cement-based material steel bridge deck pavement structure and a construction method thereof. The super-tough and low-dry shrinkage cement-based material steel bridge deck pavement structure is composed of, from bottom to top, a cement-based material base layer, a waterproof adhesion layer and an asphalt surface layer, wherein the cement-based material base layer is connected with a steel bridge faceplate through shear connectors, provided with 1-2 layers of meshes in the height direction and formed by mixing cement, coal ash, silicapowder, swelling agent, water reducer, fine sand, fiber and water, and the water-based material base layer achieves a 28-day axial compressive strength R higher than or equal to 70 MPa, an ultimate tensile strain delta higher than or equal to 1.2%, a corresponding maximum crack width delta smaller than or equal to 0.2 mm and a 28-day dry shrinkage s lower than or equal to 300 mu epsilon and is cold-mixed in situ and maintained at normal temperature; the waterproof adhesion layer is made of high-viscosity asphalt, has a 60 DEG C dynamic viscosity higher than or equal to 60000 Pa*s, achieves good adhesion performance and obtains functions of being waterproof, preventing crack expansion and upward reflection of the water-based material base layer and the like. The super-tough and low-dry shrinkage cement-based material steel bridge deck pavement structure has the advantages of being high in toughness, good in temperature stability and durability, convenient to construct, high in economical efficiency and the like.

The invention discloses an iron cobalt-based low temperature coefficient permanent magnet material, and belongs to the technical field of permanent magnet materials. The iron cobalt-based low temperature coefficient permanent magnet material is prepared from, by weight, 5-38 parts of Co, 0.9-1.2 parts of B, 10-32 parts of LRE, 0-22 parts of HRE, 0-1 part of Al, 0-0.8 part of Cu, 0-0.8 part of SM, 0.01-0.3 part of O, and the balance Fe. The iron cobalt-based low temperature coefficient permanent magnet material has the advantages that the obtained permanent magnet material presents high indoor temperature comprehensive magnetic performance, has a low residual magnetism temperature coefficient and a coercive force temperature coefficient at the same time, and shows excellent corrosion resistant performance.

The invention discloses a low-dielectric-constant microwave dielectric ceramic Ag3LiTi2O6 which can be subjected to low temperature sintering and has a near-zero resonance frequency temperature coefficient and a preparation method thereof. The preparation method comprises the following steps: weighing and batching original powder of AgNO3, Li2CO3 and TiO2 of which the purity is more than 99.9% (in percentage by weight) according to the composition of Ag3LiTi2O6; (2) performing wet ball milling and mixing on raw materials in the step (1) for 12 hours by using distilled water as a ball milling medium, drying, and then pre-sintering for 6 hours in an atmosphere at 800 DEG C; and (3) adding a binding agent into powder prepared in the step (2) and pelletizing, then performing compression molding, and finally sintering for 4 hours in the atmosphere at 850-880 DEG C, wherein the binding agent adopts a polyvinyl alcohol solution with the mass concentration of 5%, and the addition amount of polyvinyl alcohol accounts for 3% of the total mass of the powder. The ceramic prepared by using the method disclosed by the invention is good in sintering performance at 850-880 DEG C, ensures that the dielectric constant reaches 28.7-29.4, the quality factor (Qf) value reaches 53000-57000GHz, and the temperature coefficient of resonance frequency is close to zero, and has extremely large application values in industry.

The invention discloses a flow casting process based method for preparing a substrate of a circulator and belongs to the technical field of electronic materials. The method comprises the following steps: 1. preparing a main material formula: adopting Y(3-x)CaxSnxFe(5-x)O12, wherein x is equal to 0.06; 2. carrying out primary ball-milling; 3. carrying out preburning: carrying out preburning at the temperature of 1,000 DEG C to 1,200 DEG C, and carrying out heat preservation for 1 to 3 hours; 4. carrying out doping: adding the following additives: 0.2wt% of Bi2O3 and 0.10wt% of BaTiO3; 5. carrying out secondary ball-milling: adding 40wt% to 50wt% of organic bonder and 40wt% to 50wt% of anhydrous ethanol into a powder material, and carrying out ball-milling for 4 to 8 hours; 6. carrying out flow casting forming: carrying out flow casting on slurry so as to obtain raw film straps with the thickness of 100 to 120 microns; 7. carrying out lamination: laminating 8 to 15 layers of the raw film straps according to thickness demand, and carrying out press forming under the pressure of 6MPa; and 8. carrying out sintering: carrying out heat preservation for 4 hours at the temperature of 1,360 DEG C to 1,440 DEG C in an air atmosphere. Ferrite dielectric substrates, which are of different thicknesses and are smooth and even, for circulators can be obtained by adopting the method disclosed by the invention; and the substrates have the characteristic of being applicable to an X waveband and have the advantages of good temperature stability, low line width, low dielectric loss, and the like.

The invention discloses high-quality-factor temperature-stable ultralow-dielectric-constant microwave dielectric ceramic. The high-quality-factor temperature-stable ultralow-dielectric-constant microwave dielectric ceramic is characterized in that the chemical composition of the microwave dielectric ceramic is Bi3Y2Ga3O12. The preparation method of the microwave dielectric ceramic comprises the following steps: (1) weighing and batching original powder of Bi2O3, Y2O3 and Ga2O3 with purity being above 99.9 percent by weight according to the composition of Bi3Y2Ga3O12; (2) performing wet ball milling and mixing on the raw materials in the step (1) for 12 hours, and presintering for 6 hours under the air atmosphere of 1250 DEG C after drying, wherein the ball-milling medium is absolute ethanol; and (3) adding a binding agent into the powder prepared in the step (2), pelleting, performing compression molding, and sintering for 4 hours under the air atmosphere of 1300 to 1350 DEG C, wherein the binding agent adopts a polyvinyl alcohol solution with the mass concentration being 5 percent and the adding amount of polyvinyl alcohol accounts for 3 percent of the total mass of the powder. The ceramic prepared by the method is good in sintering, the dielectric constant is 13.4 to 14.3, the quality factor Qf value is up to 109000 to 158000 GHz, the resonant frequency temperature coefficient is small, and a high application value is achieved in industry.

The invention relates to the field of energy storage thin-film materials and discloses a lead-free epitaxial thin film with wide working temperature and a preparation method thereof. The lead-free epitaxial thin film comprises a Nb:SrTiO3 substrate and a thin film body, wherein the thin film body is arranged on the upper surface of the Nb:SrTiO3 substrate; the thin film body is Ba0.3Sr0.7TiO3/0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3 composite multilayer thin film; and the structure of the lead-free epitaxial thin film is Nb:SrTiO3/Ba0.3Sr0.7TiO3/0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3. The lead-free epitaxialthin film with wide working temperature does not contain lead and has excellent energy storing property, and more importantly, the lead-free epitaxial thin film has high thermal stability within the wide temperature area of 25-250 DEG C, and the working temperature of the lead-free epitaxial thin film is far higher than that of other lead-free thin films.

The invention discloses a high-efficiency excitation generator automatic voltage regulator, comprising a shell and an internal circuit, wherein the shell adopts plastic bottom case and completely encapsulated by resin, and metal connector are subjected to moistureproof and anti-salt fog treatment, so that high-efficiency excitation generator automatic voltage regulator can be used in environment at the temperature of -40 to 80 DEG C and with humidity of 95% and no frost; an external damping device is fixed in the combined group of electric generator boxes; the internal circuit comprises a voltage divider, a voltage divider, a direct current mixer, a comparison amplifying circuit, a stable feedback circuit, an electric generator slope, a horizontal detector, an excitation regulation circuit, a low-frequency detecting DIP, reference voltage, a synchronous circuit, a power supply, a low pass filter, a rectification suppression circuit and a power control device. The high-efficiency excitation generator automatic voltage regulator has the advantages that: 1, the stead-state voltage regulation factor and the temperature difference stability are good; 2, the stability is good, and thus being capable of adapting to sudden increase or reduce of load; 3, the antijamming capability is strong, and the heat dispersion is good; 4, a high-efficiency semiconductor is used in the circuit so that the lower excitation voltage (more than 5V) is ensured to be obtained by excitation.

The invention discloses an actuator based on magneto-rheological fluid. The actuator includes a dynamic platform and a static platform which are oppositely arranged, a driving member is connected between the dynamic platform and the static platform, the driving member includes a flexible pipe and the magneto-rheological fluid contained in the flexible pipe in a filling manner, the static platformis provided with a magnet exciting coil, the magneto-rheological fluid drives the flexible pipe to deform together under the effect of magnetic fields generated by the magnet exciting coil so as to drive the dynamic platform to be far away from or close to the static platform, the magneto-rheological fluid has different characteristics under different conditions of the magnetic fields and is usedas a driving element of the actuator, the magnetic fields with different strengths are applied to the magneto-rheological fluid, and therefore accurate output is realized; and in cooperation with multiple driving parts, the requirement of multi-angle driving can be met, and the advantages of being good in temperature stability, high in corresponding speed and high in accuracy are achieved.

The invention discloses a metal cavity microwave band-pass filter for audio near field communication. The band-pass filter comprises a cylindrical metal shell, two input ends, two output ends and a resonator, each input end is internally connected with a tuning dielectric, each output end is internally connected with a probe, metal end caps are arranged at two ends of the cylindrical metal shell, the resonator is arranged in a through hole of the cylindrical metal shell coaxially, two ends of the resonator are connected with the metal end caps respectively, a dielectric cylinder filled with a dielectric material inside is arranged in the cylindrical metal shell, the resonator is arranged in the dielectric cylinder, and dielectric caps are arranged at two ends of the dielectric cylinder. Through the added dielectric cylinder, the band-pass filter has no parasitic mode response in octave and has better temperature stability; moreover, the band-pass filter further has the advantages of small size, simple structure, convenience in processing and low cost.