36results about How to "Efficient isolation" patented technology

A heat-dissipating system of an equipment cabinet comprises a hot airflow collection cavity, wherein a first side face of the hot airflow collection cavity serves as an equipment cabinet back plate, a plurality of ventilation holes are formed in the first side face, a controller and a first temperature sensor connected with the controller are arranged on the first side face, at least one fan set connected with the controller is arranged inside the hot airflow collection cavity, a second temperature sensor connected with the controller is arranged at the position of an airflow inlet of the equipment cabinet, a hot airflow discharge port is formed in the hot airflow collection cavity and is used for being connected with an airflow return inlet of an airflow conditioner in a machine room through an airflow return guide pipe, the controller is used for outputting a control signal to control fans of the fan set to accelerate when the temperature difference of the temperature of discharged airflow of the equipment cabinet and the temperature of inlet airflow of the equipment cabinet is smaller than a set value, or the controller is used for outputting the control signal to control fans of the fan set to slow down when the temperature difference is larger than or equal to the set value, and the hot airflow discharged from the fans of the fan set is output from the hot airflow discharge port. By means of the heat-dissipating method, the equipment cabinet can be effectively cooled, cold airflow and hot airflow are effectively isolated, and refrigerating efficiency is improved.

The invention discloses an acoustic surface wave pressure sensor and an acoustic surface wave temperature sensor which can improve pressure-measuring sensitivity or a temperature frequency response speed and comprise a top cover and a base. The top cover and the base are sealed and mounted together, and metal electrodes penetrate through the base which is provided with a pressure conduction through hole; a fluid septum is sealed and fixed on the inner surface of the base to cover the pressure conduction through hole; a closing cavity is formed among the base, the top cover and the fluid septum; both ends of a substrate are fixed on the fluid septum, and the substrate bridges the pressure conduction through hole; an acoustic surface wave pressure sensing resonator and a datum resonator which are arranged on the substrate and the substrate are mutually parallel along the length direction; an acoustic surface wave temperature sensing resonator forms a horizontal included angle with the datum resonator; the acoustic surface wave pressure sensing resonator rightly faces to the central part of the pressure conduction through hole; the acoustic surface wave temperature sensing resonator, the acoustic surface wave pressure sensing resonator and the datum resonator are respectively connected with corresponding bonding pads; the metal electrodes are correspondingly connected with the two bonding pads; and a frontal projected area of a pressure sensitive area on the substrate is smaller than a cross section area of the pressure conduction through hole.

The invention relates to a vibration-reducing road pad and a method for paving a monolithic roadbed track by adopting the vibration-reducing road pad. The road pad comprises a substrate and conic protrusions; the substrate consists of a damping layer, a rubber coating layer, a woven fabric layer, a rubber coating layer, an interlayer, a rubber coating layer, a woven fabric layer, a rubber coating layer and a covering layer in sequence; the conic protrusions are formed on the damping layer, wherein the conic protrusions are arrayed on the substrate in an array shape; the vibration-reducing road pad can efficiently isolate structural vibration with noise of a high-speed railroad and similar objects, thereby reducing resistance and abrasion; and through tests, after the vibration-reducing road pad is arranged on the high-speed railroad by a packing method, the heavy axle load reaches 25 t, and the speed can reach 396 km / h.

The invention belongs to the technical field of metal surface treatment, and discloses a graphene-coated aluminum composite coating, a preparation method and application thereof. The preparation method comprises the steps that aluminium powders are put into a graphene oxide aqueous solution and are subjected to a mixing reaction, and thus graphene-coated aluminium powders are obtained; a metal surface is subjected to roughness fabrication adopting a method of mechanical treatment, and the metal surface with roughness is obtained after being cleaned and dried; a cold spraying device is started,and the graphene-coated aluminium powder is put into a specified powder feeding tube; and the metal surface with roughness is installed on a specific fixture, a cold spraying technological parameteris set, and the spraying device is started to deposit the composite graphene-coated aluminium powders on the metal surface with roughness, and the preparation of the graphene-coated aluminum compositecoating is carried out. According to the aluminium powders coated through the preparation method, the surface hardness is improved, the fluidity is better, and the phenomenon of tube plugging duringspraying is avoided, and thus the spraying efficiency is improved. The structure of the graphene-coated aluminum composite coating has high compactness, can efficiently insulate eroding ions, has higher corrosion resistance and can be used in the field of corrosion prevention.

The invention discloses a sealed feeding device for pyrolysis carbon gas combined production and a feeding method of the sealed feeding device. The sealed feeding device comprises material conveying barrel bodies, a mechanical executing mechanism, a sealed hopper and a material collector. The material conveying barrel bodies are made from national standard stainless steel pipes, and two material barrels are adopted to be arranged in parallel; the crank connection rod principle is applied by the mechanical executing mechanism, and a connection rod is connected with a transmission mechanism anda pushing piston; a high-frequency vibrator is arranged on the sealed hopper; the material collector is connected with the two material conveying barrels; and a lower discharging port is connected with a biomass pyrolysis furnace. According to the sealed feeding device for pyrolysis carbon gas combined production and the feeding method of the sealed feeding device, the design of dual sealing is adopted, and a long material layer in the material conveying barrels forms a secondary material sealing layer while materials in the hopper form a primary material seal; meanwhile, due to the special design of the double material barrels, the requirement of the device for continuous and uniform material conveying can be well met, the problems that due to the single-material-barrel design, interrupting of material conveying is caused during pumping of a piston, and the treatment effect of the biomass pyrolysis furnace is affected are solved, meanwhile, the material conveying efficiency of the device is improved, and the overall process level is improved to a certain extent.

The invention discloses a lightweight combined-type plate structure used for low-frequency noise insulation. The lightweight combined-type plate structure is composed of a noise insulation substrate, beam piece units and supporting members. The beam piece units are fixedly connected on the noise insulation substrate through the supporting members, each beam piece unit comprises at least one cuboid-structured beam piece, and central points of the beam pieces are fixedly connected with the corresponding supporting members; the minimum order resonance frequency of one beam piece is identical with one target noise frequency. The design method includes the steps 1), respectively determining design parameters according to number of target noise bands; 2), determining a structural parameter of the noise insulation substrate; 3), when determining periodic spacing a, selecting the same within the range of 0<a<lambada; 4), determining structural parameters of the beam piece units, wherein the structural parameters include the number of the beam pieces and the thickness hr, the length lr and the width br of each beam piece; according to the number of the target noise frequencies, obtaining the number of the beam pieces in one-to-one correspondence to the number of the target noise frequency, and according to actual engineering requirements, respectively selecting the thickness hr of different beam pieces and calculating to determine the length lr and the width br of each beam piece.

The invention discloses a method and a covering material for in-situ treatment of polluted bottom mud. The method for in-situ treatment of polluted bottom mud comprises the following steps: a supporting structure barrier layer and a protective layer are sequentially laid on the surface of the polluted bottom mud, and the supporting structure barrier layer is formed by mixing aggregate and a sealing substance and then interacting with water; the aggregate is natural mineral; and the sealing substance is natural clay, sepiolite, attapulgite or kaolin. The covering material comprises the aggregate and the sealing substance, and the aggregate is the natural mineral; and the sealing substance is natural clay, sepiolite, attapulgite or kaolin. The bottom mud and the water body are efficiently isolated, so that all types of pollutants such as organic matters, nitrogen, phosphorus and heavy metals cannot be released to the water body, and the purpose of in-situ treatment of the polluted bottommud is achieved.

The invention relates to the technical field of port safety protection equipment, and discloses a safety protection device for port wharf construction. The safety protection device comprises anti-collision piers; the tops of the anti-collision piers are fixedly connected with supporting rods; the tops of the supporting rods are fixedly connected with supports; annular steel hoops are fixedly connected to the inner walls of the supports; the bottoms of the anti-collision piers are fixedly connected with a port slope; one side of the outer wall of the port slope is fixedly connected with a fender through mounting rods; one side of the outer wall of the fender is fixedly connected with a cushioning pad; and the two ends of the fender are fixedly connected with connecting lock chains correspondingly. According to the safety protection device for port wharf construction, by arranging the anti-collision piers, the supporting rods, the annular steel hoops, steel wire protection nets and warning signs, the port ground is safely protected; through the stability of the anti-collision piers, the effect of preventing the protection device from being collided by a ship and then damaged is achieved; the first-layer protection effect is achieved through the supporting rods and the steel wire protection nets, and the port ground is basically protected; and the warning signs warn passersby.

The invention discloses a heat-resistant anti-aging SBS modified asphalt waterproof coiled material. The coiled material is prepared from, by weight, 100 parts of asphalt, 6-10 parts of SBS, 2-4 partsof ferric chloride, 10-18 parts of anti-aging agent, 20-30 parts of ceramic silicone rubber powder, 1-3 parts of polytetrafluoroethylene micro-powder, 15-25 parts of naphthenic oil, 0.4-1 part of silane coupling agent and 30-50 parts of white carbon black; the anti-aging agent is prepared from, by weight, 10 parts of modified magnesium-aluminum carbonate hydrotalcite, 1-2 parts of tetramethylpiperidine, 4-6 parts of butylated hydroxytoluene, 2-3 parts of 2,4'-dihydroxybenzophenone, 3-5 parts of 2,4,6-tri(2-hydroxy-4-butoxy-phenyl)-1,3,5-triazine and 0.6-1 part of nano titanium dioxide. According to the coiled material, the asphalt is modified through the synergy of SBS, the ceramic silicone rubber powder and the polytetrafluoroethylene micro-powder, the comprehensive performance of the waterproof coiled material is obviously improved, the produced waterproof coiled material can effectively block ultraviolet rays and eliminate free radicals, and has the excellent aging resistance, decontamination, acid resistance, alkali resistance and high temperature resistance.

The invention relates to the technical field of wood-plastic plates, in particular to a sulfonyl biochar flame-retardant wood-plastic plate and a production method thereof, and the sulfonyl biochar flame-retardant wood-plastic plate comprises the following components in parts by weight: 20-30 parts of bamboo and wood fiber powder, 90-110 parts of ground calcium carbonate, 70-90 parts of polyvinyl chloride resin powder, 9-15 parts of PBS resin, 8-12 parts of hollow ceramic micro-beads, 8-12 parts of an ethylene-vinyl acetate copolymer, 5.5-7.5 parts of sulfonated carbon, 4-5 parts of a heat stabilizer, 5-6 parts of a foaming regulator, 0.6-1.2 parts of a foaming agent, 0.5-1 part of stearic acid and 0.5-1 part of PE wax. The flame-retardant effect of the wood-plastic plate can be improved, and the release speed and release amount of smoke during combustion of the wood-plastic plate are reduced.

The invention discloses a self-disturbance type soybean precision seed sowing device. A seed box is arranged on the outer surface of a front shell and communicates with the front shell, a rear shell is provided with a seed sowing opening, and a disturbance fan blade is fixed through a shaft and is limited by the inner surface of the front shell and a seed sowing wheel; the disturbance fan blade works to drive a population to move violently, so that population activeness is improved, interspecific friction force is reduced, and the seed filling effect is improved; compound type holes are uniformly distributed on the surface of the inner wall of the circumference of the seed sowing wheel, 20 compound type holes are arranged in each row, the compound type hole structure is provided with guide grooves, a seed fixing plate and an arc-shaped seed cavity, and each guide groove extends to the opening of the next type hole; just one seed can be reserved in the arc-shaped seed cavity to effectively isolate to-be-thrown seeds from other seeds, so that reliable seed cleaning is ensured; the seed fixing plate plays a role in stabilizing the seeds to be thrown, so that the throwing row spacing is consistent. The disturbance fan blade is cooperated with the compound type holes, so that the seed sowing device can complete four working processes of active continuous seed filling, quantitative seed cleaning, stable seed protection and precise seed throwing, and the seed sowing precision is improved.

The invention provides a multifunctional double-layer soft enclosure suitable for planting submerged plants, which comprises: a plurality of sections of floating bodies; the separation membrane that is folded in half to form a double-layer structure; the carbon fiber grass that comprises a porous reticular microorganism carrier ball, a fiber strip and a fixing belt; and the bottom fixing device that comprises sandstone and a steel pipe. The multifunctional double-layer soft enclosure suitable for planting submerged plants is arranged along a river bank through the floating body and the separation membrane; an independent enclosure area is formed, a flow baffle is arranged on the upstream to reduce water flow and prolong the service life of the soft enclosure, the bottom of the separation membrane is reinforced through gravel balance weight, a micropore aeration disc and carbon fiber grass are arranged on the inner side of the enclosure, dissolved oxygen in the enclosure is increased, and water in the enclosure is purified through microorganism biofilm culturing of the carbon fiber grass.

The invention discloses an acoustic meta-material scatter sound insulation device. The acoustic meta-material scatter sound insulation device is composed of a frame structure and an acoustic meta-material scatterer arranged in the center of the frame structure. A ventilation region is formed between the frame structure and the acoustic meta-material scatterer. The acoustic meta-material scatterer comprises a core and a shell. The shell warps the outer portion of the core and is made of acoustic meta-materials. The acoustic meta-materials have gradient negative refractive indexes. The characteristic that the effective scattering sound cross section area of the acoustic meta-material scatterer is far larger than the geometrical cross section area of the acoustic meta-material scatterer is used for manufacturing the sound insulation device. The sound insulation device has ventilation performance and sound insulation performance, particularly has good sound insulation effect to low-frequency sound waves, and can be applied to building sound insulation and construction of sound insulation curtain walls on the two sides of a road or a railway.

The invention discloses an enterprise message pushing security gateway system based on enterprise WeChat, and belongs to the field of enterprise information security management, and the system comprises a first processing module which is used for receiving a first message pushed by an enterprise application, and creating a second message of the first message; a message management module which is used for managing the message cache of the second message according to the management request; a second processing module which is used for reading a second message of the message cache, and calling the extra-domain interface to send a third message containing all or part of parameter information of the second message to the extra-domain server according to one or more push rules, wherein only the third message comprises an interface key of the enterprise WeChat account. The method has the effect that when the interface calling of the cross-information domain is carried out, a plurality of applications in one information domain can only push messages to the service provider of another information domain through the security pushing rule of the security gateway system disclosed by the invention, so that the cross-domain information security is realized.

The invention discloses Portland cement and a preparation method thereof. The Portland cement comprises the following raw materials in parts by weight: 50-60 parts of Portland cement clinker, 10-15 parts of graphite polyphenyl granules, 5-6 parts of limestone, 7-10 parts of kapok fibers, 4-6 parts of gypsum powder, 1-3 parts of silicon dioxide, 1.5-2 parts of a foaming agent and 35-45 parts of water. The preparation method comprises the following steps of: mixing and grinding Portland cement clinker, graphite polyphenyl granules, limestone and kapok fibers to obtain a mixture A, then adding the mixture A and water into a high-speed stirrer for secondary mixing to obtain a mixture B, then adding the mixture B, gypsum powder and silicon dioxide into a mixing stirrer for mixing to obtain a mixture C, and finally adding the mixture C and a foaming agent into a mixing stirrer for mixing. According to the Portland cement and the preparation method thereof, the graphite polyphenyl granules, the kapok fibers and the foaming agent are added, so that the Portland cement has the effects of efficient isolation and convenient heat preservation, and the Portland cement is relatively low in production cost, simple and rapid in process and suitable for popularization and application.

The invention relates to an airway operation protective hood for respiratory tract infectious diseases. The airway operation protective hood comprises a closed hood body, operation holes arranged in the hood body, a fitting port used for the head of a patient to pass through, and a first connector used for connecting a breathing circuit; an internal cavity used for accommodating the head of the patient is arranged in the hood body; flexible isolation parts for isolating the operation holes from the internal cavity are respectively arranged in the operation holes; the operating holes are used for hands of the user to pass through; and the first connector communicates with the internal cavity. The protective hood is novel in design, is simple to use and is more efficient in isolation, and medical personnel can flexibly complete airway operation outside the hood body which completely isolates the respiratory tract of a patient, so that the infection risk of the medical personnel is greatly reduced. The airway operation protective hood is particularly suitable for tracheal intubation protection of patients with infectious diseases infected by respiratory tracts and is suitable for local isolation when a patient is subjected to invasive or non-invasive respiratory support.

The invention discloses a manufacturing method of a quantum dot film with high water vapor isolation. The manufacturing method comprises the following steps: A, preparing an organic polymer plastic material with hydrophobic property; B, enabling the hydrophobic organic polymer plastic material to be in a molten state, and then uniformly mixing quantum dots into the molten organic polymer materialto obtain a base material; and C, carrying out extrusion molding on the base material obtained in the step B to form the quantum dot film. The quantum dots are surrounded by the polymer plastic material, the hydrophobic polymer plastic material can efficiently isolate water vapor and oxygen, and the stability and long-term effectiveness of the quantum dots are greatly improved.

The invention discloses a universal cement mortar test mold and relates to the technical field of molds. The universal cement mortar test mold comprises a bottom plate, a front baffle, a rear baffle, at least one transverse partition plate, a plurality of longitudinal partition plates and two pressure applying devices connected to the two sides of the top face of the bottom plate correspondingly, and the front baffle and the rear baffle are oppositely arranged at the two ends of the top face of the bottom plate; the two pressure applying devices are used for pushing the front baffle and the rear baffle to move towards each other, the transverse partition plate is arranged between the front baffle and the rear baffle, one end of each longitudinal partition plate abuts against the transverse partition plate, and the other end of each longitudinal partition plate abuts against the front baffle, the rear baffle or the other transverse partition plate. The front baffle or the rear baffle, the bottom plate, the transverse partition plate and the longitudinal partition plates define a plurality of mold cavities with openings in the tops. According to the universal cement mortar test mold, the multiple mold cavities can be rapidly and efficiently isolated, the integrity, stability and sealing performance of mold assembly are effectively improved, and the mortar leakage probability is reduced.

The invention provides ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal contaminated soil and a preparation method of the ferrihydrite modified biochar. The preparation method comprises the following steps that reed straw is cleaned, naturally air-dried and smashed, and smashed straw is obtained; performing high-temperature pyrolysis on the crushed straws, and naturally cooling to obtain a pyrolysis product; the pyrolysis product is ground, smashed and sieved, and biochar is obtained; adding charcoal and a potassium hydroxide solution into the ferric nitrate solution, dropwise adding 20mL of the solution, continuously stirring to react, and stirring for 30 minutes to obtain a mixture; and centrifuging the mixture, repeatedly cleaning and centrifuging, and drying to obtain ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal polluted soil. The invention also comprises the ferrihydrite modified biochar prepared by the method. The biochar skeleton can effectively isolate iron oxide, prevent agglomeration of the iron oxide and slow down the aging lattice rate of the iron oxide, and the problems that in the prior art, materials are prone to caking and agglomeration, and the heavy metal adsorption efficiency is low are effectively solved.

The invention discloses a 10-channel full automatic digital megger. The 10-channel full automatic digital megger comprises a casing body, a signal processing module arranged in the casing body, a signal acquisition unit arranged outside the casing body, and a signal distribution device which is arranged between the signal processing module and the signal acquisition unit. According to the invention, a signal passes through a converter; a humidity adjustment module and a temperature adjustment module are arranged in the casing body to adjust the temperature and humidity of the digital megger to ensure that the device is in the best working condition at all times; and the 10-channel full automatic digital megger is worthy of application and promotion.

The invention provides a fire-fighting isolation method for a charging bin. The fire-fighting isolation method comprises the following steps: acquiring state information of a battery pack in the charging bin; analyzing the state information of the battery pack to judge whether the battery pack is abnormal or not; if the state of the battery pack is abnormal, sending a fault code, cutting off a charging power loop of the battery pack, and controlling the battery pack transfer structure to convey the abnormal battery pack to the isolation device; if the state of the battery pack is normal, continuously charging the battery pack. The invention further provides a charging bin battery pack isolation structure applying the method. By accurately acquiring the state information of the battery pack, the battery pack transfer structure controls the abnormal battery pack to be transferred out of the charging bin, damage to the charging bin is avoided, and the problems that in the prior art, a fire extinguishing scheme for the battery pack is low in fire extinguishing efficiency and high in cost are solved.

The invention discloses a rubber vibration isolation pad which comprises at least one surface layer. At least one side surface of each surface layer is provided with a plurality of conical protrusions, the various conical protrusions are arranged to form an array, each conical protrusion comprises a symmetrical key-shaped body, and the section side of each symmetrical key-shaped body comprises two semicircles and two straight lines. The rubber vibration isolation pad has the advantages that problems of rail vibration generated during rail transit, vibration of building structures, vibration of mechanical equipment and the like can be effectively solved, the service life of a rail system can be prolonged, and the living quality of residents in areas around the rail system can be improved.

The invention discloses an acoustic meta-material scatter sound insulation device. The acoustic meta-material scatter sound insulation device is composed of a frame structure and an acoustic meta-material scatterer arranged in the center of the frame structure. A ventilation region is formed between the frame structure and the acoustic meta-material scatterer. The acoustic meta-material scatterer comprises a core and a shell. The shell warps the outer portion of the core and is made of acoustic meta-materials. The acoustic meta-materials have gradient negative refractive indexes. The characteristic that the effective scattering sound cross section area of the acoustic meta-material scatterer is far larger than the geometrical cross section area of the acoustic meta-material scatterer is used for manufacturing the sound insulation device. The sound insulation device has ventilation performance and sound insulation performance, particularly has good sound insulation effect to low-frequency sound waves, and can be applied to building sound insulation and construction of sound insulation curtain walls on the two sides of a road or a railway.

The invention discloses an isolation membrane material composition for a waterproof coiled material. The isolation membrane material composition is made of the following components in weight percentage: 70% to 90% of polyvinyl alcohol; 0.5% to 90% of functional additives 10%; the dispersant is 0.5%~3%; the surfactant is 0.5%~6%; the plasticizer is 1%~6%; the rest is water; The materials commonly used in construction are used as functional additives, which improve the dissolution rate of the isolation film and the bonding force between the concrete and the waterproof membrane after pouring, and significantly improve the waterproof effect. Applying the isolation membrane material composition for waterproof coiled material provided by the present invention, the special sand-containing water-soluble isolation membrane for waterproof coiled material that does not need to be peeled off during construction can effectively reduce construction strength, reduce pollution, protect the environment, and can solve the problem of existing concrete and asphalt Problems such as weak bonding and easy detachment of coiled materials can greatly improve construction efficiency, save production and use costs, and are economical and environmentally friendly.

The invention relates to an acoustic meta-material basic structure unit, and the structure unit comprises a boundary constraint frame. The interior of the boundary constraint frame is provided with an in-frame constraint body. At least one of the upper and lower surfaces of the boundary constraint frame is covered with a film. The invention also provides an acoustic meta-material plate comprising the acoustic meta-material basic structure unit, and an acoustic composite structure comprising the acoustic meta-material plate. In addition, the invention also provides a method for achieving working frequency adjustment sound insulation band of an acoustic meta-material through the change of the structural size and material parameters of the boundary constraint frame of the acoustic meta-material, the in-frame constraint body and the film. The unit is simple in assembly technology, is long in service life, restrains the vibration mode of the film, and enables the performance and stability of a sound insulating material to be improved.

The invention discloses a multistage-seal corrosion-resistant hydraulic valve comprising a cable connector, a machine body and a seal box. One side of the seal box is provided with a sponge cushion. The other side of the seal box is provided with a waterproof cushion. A motor is arranged on one side of the machine body. The other side of the machine body is fixedly connected with the sponge mat. The upper side of the machine body is provided with seal openings. One side of the machine body is provided with a lock buckle and a pull ring. One end of the motor is provided with a hydraulic head. The other end of the motor is provided with a controller. One end of the cable connector is provided with cables. The multistage-seal corrosion-resistant hydraulic valve is provided with a bunching clamp, the seal box and a corrosion-resistant coating and can arrange the cables and prevent the cables from being damaged, good seal of equipment is achieved, air is well isolated, corrosion caused by damp air and other matter is avoided, and the multistage-seal corrosion-resistant hydraulic valve is suitable for different work conditions and brings a better use prospect.

The invention discloses an elastic-hysteretic low-frequency large-displacement vibration isolator based on electromagnetic negative stiffness. The upper platform and the lower platform are connected by arched beam springs, so that the upper platform can only move axially relative to the lower platform; On the lower platform, the electromagnetic negative stiffness spring composed of inner and outer magnetic rings and electromagnetic coils is connected in parallel with the second and third thin springs to form a real-time adjustable electromagnetic bistable mechanism, and the electromagnetic bistable mechanism is fixedly connected to the upper platform. The first leaf spring on the top is arranged in series; under the excitation of low-frequency large-displacement vibration, the electromagnetic bistable mechanism jumps back and forth between the two balance points and consumes energy to generate elastic-hysteresis phenomenon, achieving high-efficiency vibration isolation; provided by the inner and outer magnetic rings Permanent magnet negative stiffness, adjusting the size of the current in the electromagnetic coil can realize the real-time regulation of the electromagnetic negative stiffness performance, so as to obtain the ideal electromagnetic bistable characteristics, and realize the active and passive integrated vibration isolation. The invention is especially suitable for low frequency large Displacement vibration isolation and buffering conditions.

The invention discloses an acoustic surface wave pressure sensor and an acoustic surface wave temperature sensor which can improve pressure-measuring sensitivity or a temperature frequency response speed and comprise a top cover and a base. The top cover and the base are sealed and mounted together, and metal electrodes penetrate through the base which is provided with a pressure conduction through hole; a fluid septum is sealed and fixed on the inner surface of the base to cover the pressure conduction through hole; a closing cavity is formed among the base, the top cover and the fluid septum; both ends of a substrate are fixed on the fluid septum, and the substrate bridges the pressure conduction through hole; an acoustic surface wave pressure sensing resonator and a datum resonator which are arranged on the substrate and the substrate are mutually parallel along the length direction; an acoustic surface wave temperature sensing resonator forms a horizontal included angle with the datum resonator; the acoustic surface wave pressure sensing resonator rightly faces to the central part of the pressure conduction through hole; the acoustic surface wave temperature sensing resonator,the acoustic surface wave pressure sensing resonator and the datum resonator are respectively connected with corresponding bonding pads; the metal electrodes are correspondingly connected with the two bonding pads; and a frontal projected area of a pressure sensitive area on the substrate is smaller than a cross section area of the pressure conduction through hole.