87results about How to "Fast dissipation" patented technology

The invention relates to resin combination with high thermal conductivity and glass transition temperature used for a printed circuit board. According to the weight percentage, the resin combination comprises brominated epoxy resin occupying 20 percent to 70 percent, hardening agent occupying 1 percent to 10 percent, accelerating agent occupying 0.1 percent to 10 percent, inorganic powder occupying 0 percent to 20 percent, high heat conducting powder occupying 5 percent to 85 percent, and processing auxiliary agent occupying 0 percent to 10 percent. The resin combination has the advantages of high glass transition temperature and heat conducting performance, excellent thermal resistance and flame resistance, which can be applied to the heat conducting insulating layer of the printed circuit board after being made into a high heat conducting preimpregnated body through a containing and soaking way or into a high heat conducting coating through a coating way, thus the printed circuit board has high heat conducting performance, and the heat quantity generated by the operation of the electronic elements on the printed circuit board can be rapidly dissipated to enhance the service life and the stability of the electronic elements.

The invention relates to a resin composition with high thermal conductivity, no halogen and fire retardance, which is applied to a printed circuit board and used as a thermal-conduction insulating layer. The resin composition comprises 5 to 70 weight percent of phosphorus epoxy resin, 0 to 50 weight percent of epoxy resin with a plurality of functional groups or double functional groups, 1 to 20 weight percent of hardening agent, 0.01 to 10 weight percent of accelerant, 0 to 20 weight percent of inorganic powder, 5 to 85 weight percent of high thermal-conduction powder and 0 to 10 weight percent of processing additive; in addition to high thermal conductivity, excellent thermal resistance and fire retardance, the resin composition does not contain a halogenous fire retardant and does not generate toxic or corrosive gas in combustion and is an environment-friendly material; the resin composition can be prepared into a pre-impregnated body with high thermal conductivity through an impregnation method or prepared into a coating material with high thermal conductivity by a coating method; the pre-impregnated body or the coating material is applied as the thermal-conduction insulating layer of the printed circuit board so that the printed circuit board has high thermal conductivity and is favorable for rapidly dissipating heat generated in the operation of electronic components of the printed circuit board to prolong the life service and the stability of the electronic components.

The invention provides a sandwich energy-absorbing device which comprises an upper panel, a lower panel, lateral plates and a core plate layer, wherein the core plate layer is fed in a closed space formed by enclosing the upper panel, the lower panel and the lateral plates, and the core plate layer comprises core materials and a shear thickening fluid material fed between the core materials and / or fed between the core materials and the closed space. When an energy-absorbing device suffers from an action an external impact, structures of the upper panel, the lower panel, the lateral plates and the core materials rapidly deform, so that a quick shear action is applied to the shear thickening fluid material fed in a core plate, the viscosity of the shear thickening fluid material with a relatively high shear strain rate is rapidly improved, and thus impact energy is rapidly dissipated, and relatively high specific strength, specific stiffness and vibration resistance and energy absorption capabilities are achieved.

The invention discloses a reflection type superconducting transmission line resonant cavity. The reflection type superconducting transmission line resonant cavity includes a dielectric substrate; the dielectric substrate is provided with two parallel coupling microstrip transmission lines, two toothed coupling capacitors and two microwave access electrodes; one end of each coupling microstrip transmission line is suspended, and the other end of the coupling microstrip transmission line is coupled to one microwave access electrode through one toothed coupling capacitor; and the coupling microstrip transmission lines, the toothed coupling capacitors and the microwave access electrodes are respectively made of aluminum superconducting materials. The reflection type superconducting transmission line resonant cavity of the invention only occupies a small space, and can be integrated on the same substrate together with quantum bits, and therefore, the reflection type superconducting transmission line resonant cavity has excellent integratability; the reflection type superconducting transmission line resonant cavity can be excellent coupled with the quantum bits, so that quantum information exchange can be effectively completed; the reflection type superconducting transmission line resonant cavity can maintain a low-energy few-photon resonant state, so that accurate transmission of quantum information can be ensured; influence of environment noises can be effectively eliminated; adjustment of the Q value of the resonant cavity can be facilitated; and the balance of quantum information maiming ability and exchange ability can be also realized.

The invention discloses a method for packaging a wafer level glass micro-cavity of a light-emitting diode (LED), and the method comprises the following steps: (1) etching a micro-slot array corresponding to the pattern of a packaged LED array on a silicon wafer, wherein the micro-slots are communicated through a micro-channel, and a proper amount of heat gas releasing agent is arranged inside the micro-slots; (2) forming a closed cavity; (3) heating the bonded wafer in the air to form a spherical glass micro-cavity and a cylindrical glass micro-channel connected with the spherical glass micro-cavity, cooling to room temperature, annealing, and removing silicon to obtain a wafer level glass micro-cavity; (4) sputtering a metal layer on the silicon wafer, and preparing a metal lead through photolithography, so as to obtain a lead substrate, wherein the position of the metal lead corresponds to the position of the micro-channel of the glass micro-cavity; (5) mounting an LED chip on the lead substrate, and leading; (6) bonding the wafer level glass micro-cavity with the substrate to form a bonded wafer; and (7) filling the gap between the LED chip and the wafer level glass micro-cavity with silicone through the glass micro-channel. According to the invention, the light emitting efficiency is high, and a packaged glass lens realizes beam collimation.

The invention discloses a formula and a smelting key technique for a high-strength and high-tenacity aluminum alloy. The high-strength and high-tenacity die-casting aluminum alloy has good casting performance, mechanical performance and thermal treatment performance, and also has high strength and tenacity, so that the mechanical performance of the aluminum alloy is good; recording of cicada chirping is placed in a metal fluid in the smelting key technique, so that characteristic sound vibration of cicada chirping can spread in the metal fluid; according to observation, sound vibration of cicada chirping can generate more scattering and dissipating in a spreading medium compared with sound vibration with more low-frequency components; and more ripples can be motivated on the surface of themetal fluid.

The invention relates to a preparation method of an electric welding protective clothing fabric and the prepared electric welding protective clothing fabric. The method comprises the following steps:a) cellulose fibers and unmodified vinylon or modified vinylon are provided for blending, and a textile is obtained; b) the textile obtained in step a) is dyed with a dye, and a dyed textile is obtained; c) the dyed textile obtained in step b) is soaked in a tetrahydroxymethyl phosphorus compound aqueous solution, drying, ammonia fumigation and oxidation are performed, and a flame retardant textile is obtained; d) coating composition is applied to the front of the flame retardant textile obtained in step c), then thermally setting is performed, and a front-coated flame retardant textile is obtained, wherein the coating composition contains aqueous polyurethane resin, a crosslinking agent, aluminum hydroxide powder, decabromodiphenyl ethane, antimony trioxide, a penetrant and lignin powder;e) a fluorine-based water repellent is locally applied to the reverse side of the front coated flame retardant textile obtained in step d).

A chip-embedded encapsulation structure is provided, which consists essentially of a bearing board with a raised section, a semiconductor chip formed on the raised section of the bearing board, an insulation layer formed on the bearing board and the semiconductor chip, as well as a circuit layer formed on the insulated layer. The circuit layer can be electrically connected to an electrode cushionof the semiconductor chip through a plurality of conductive structures so that the semiconductor chip can electrically extend outwards. By adjusting the thicknesses of the raised section of the bearing board, the insulation layer and the bearing board, warping phenomenon of the encapsulation structure caused by changes of temperature during manufacture can be controlled.

The invention relates to a double-cylinder by-pass type magnetorheological vibration damper. The vibration damper comprises a working cylinder barrel, a liquid storage cylinder barrel, a piston and apiston rod, wherein the piston rod penetrates through a guide ring, and the guide ring is connected with a liquid storage cylinder body together; a magnetorheological effect valve and the whole vibration damper are installed together by the guide ring; a magnetic conductive sleeve connected with the magnetorheological effect valve by a magnetic insulation gasket is sequentially provided with an upper magnetic conductive plate, a magnetic insulation washer, a middle magnetic conductive plate, a magnetic insulation washer and a lower magnetic conductive plate along the inner axial direction; electromagnetic coils are sleeved on the circumferences of the upper magnetic conductive plate, the middle magnetic conductive plate and the lower magnetic conductive plate by magnetic insulation sleeves; the middle parts of the upper magnetic conductive plate and the lower magnetic conductive plate are provided with axial through holes communicated with a liquid discharge hole and a press plate oilduct; and three arc grooves are uniformly distributed at the circumference of the middle magnetic conductive plate. When the piston rod moves, magnetorheological fluid flows among a working cylinder,the magnetorheological effect valve and a liquid storage cylinder. The invention can ensure a larger stroke and be beneficial to dissipating the heat of the electromagnetic coils; and the flow of themagnetorheological fluid in the coils not only can generate large damping force but also ensure portable integration.

The invention provides a formula of a high-strength high-toughness aluminum alloy and a smelting key technology thereof. The high-strength high-toughness aluminum alloy has good casting properties, mechanical properties and heat treatment properties, and further has relatively high strength and toughness, so that mechanical properties of the aluminum alloy are good. In the smelting key technology,a cicada chirping record is placed into a metal liquid, so that characteristic sound vibration of cicada chirping can spread in the metal liquid, it is observed that compared with low-frequency soundvibration with multiple components, sound vibration of cicada chirping can better scatter and dissipate in a communication medium, and more ripples can be aroused on the surface of the metal liquid.

The invention relates to a multi-stable nonlinear energy well with a piecewise linear beam and permanent magnet negative stiffness. The multi-stable nonlinear energy well comprises the piecewise linear beam which is composed of three piecewise linear rods with different stiffness. One end of the piecewise linear beam is fixed to a piecewise linear beam pedestal, and the other end of the piecewiselinear beam is inserted into an MNES mass block. During installation, a certain pre-compression amount is reserved between the piecewise linear rods of the two sides and the MNES mass block. A gap isreserved between the piecewise linear rod in the middle and the MNES mass block. Along with up-and-down movement of the MNES mass block, the compression amount between the MNES mass block and the piecewise linear beam is changed, and piecewise linear positive stiffness is produced. The required negative stiffness is produced through inner magnets and outer magnets, and required multiple stable positions are constructed through the optimal cooperation of the positive stiffness and negative stiffness. Vibration energy of a to-be-damped system is transmitted into the energy well in a unidirectional mode, and finally the energy is rapidly dissipated through damping by the energy well, and thus main system vibrations can be efficiently restrained. The energy well is simple in structure, wide invibration suppressing frequency band and remarkable in vibration suppressing effect.

The invention discloses a method for designing and optimizing a passive vibration controller for fluid conveying pipe vibration control, and aims at solving the excessive vibration problem of fluid conveying pipes, providing the advantages of being free of external energy input and simple in installation operation, and breaking through the problem that the passive controller are relatively large in mass. The passive controller consists of parallel nonlinear energy traps; in order to verify the vibration control effect of the vibration controller, a mathematic model of a fluid conveying pipe-vibration controller system is established on the basis of a target energy transfer theory; and after dimension reduction and discretization are carried out on a dimensionless model through a standard Galerkin method, numerical simulation of the system is completed under a boundary condition of the system. Results indicate that the vibration controller is capable of rapidly and effectively dissipating the vibration energy of the fluid conveying pipes via a mass which is 5% of the mass of the whole system. Finally, the control is optimized through a ratio function of the energy dissipated by the controller and the total energy of the system; and the optimization result indicates that the precision requirement for mounting positions is not high in a certain range.

The invention discloses a machining device for high-frequency welded pipe production. The machining device comprises a machine body, wherein a first limiting supporting plate is mounted at the left end of the front surface of the machine body through bolts; a driving conveying wheel is arranged at the right end of the first limiting supporting plate; and a driven conveying wheel is arranged belowthe driving conveying wheel. According to the machining device, two limiting plates are mounted in the feeding direction, the limiting plates can be inserted into edge gaps of a pipe blank, the pipe blank is prevented from rotating during conveying, so that when the pipe blank is extruded by an extrusion roller, the upper pressure, the lower pressure and the pressure direction are kept balanced, the welding quality is greatly guaranteed, and burrs are reduced; and an air guide disc is mounted on a cooling fan, the air guide disc can rotate under the blowing of airflow, the flow speed of the airflow is reduced due to the blockage of the structure of the air guide disc, the air supply area can be increased, the flow speed is more uniform, cooling is more gentle, internal cracks caused by toofast cooling are avoided, and the surface quality of a steel pipe is greatly maintained.

The invention relates to method and device for fast preparing white activated rice hull ash. The method comprises the following steps: (1) carrying out diluted acid pretreatment on rich hulls for 2-24 hours; (2) washing the rice hulls subjected to diluted acid pretreatment for many times, and removing impurities in the rice hulls; and (3) directly placing the washes rice hulls into an incineration basket, and incinerating in a furnace body, controlling the grate temperature of the furnace body at the temperature of 600-800 DEG C, and preparing rice hull ash with 50 nanoscale particles, wherein the content of amorphous silica achieves more than 90%, the amorphous silica is white and evenly distributed, and the rich hull ash is loosely stacked. The device comprises an insulating furnace body, the incineration basket, a temperature controller, a thermocouple temperature sensor, a resistance wire, an adjustable air inlet and an adjustable air outlet. The method and the device can be used for fast producing white activated rice hull ash capable of substituting silica fume.

The invention discloses an oil-gas well hot N2 plugging removal technology method. The method comprises the steps that a plugging removal device is connected to an oil (gas) extraction wellhead through ground pipelines; step 2, an injection pipeline is subjected to pressure test according to the level of the oil (gas) extraction wellhead; step 3, hot nitrogen is injected into a well, dissolved and subjected to pressure release, the hot nitrogen is injected, dissolved and subjected to pressure release again, and the process is repeated for multiple times until plugging is removed. The device comprises a liquid storage tank, the wellhead and a nitrogen production device, an oil tube is connected to the lower portion of the wellhead and sleeved with a sleeve, an inlet / outlet is formed in the side face of the wellhead and communicated with the oil tube, and an inlet / outlet is formed in the side face of the sleeve and communicated with an annular space portion of the oil sleeve. The method has the advantages that the hot nitrogen does not burn or blast, has no chemical corrosivity or pollution and is safe and reliable, the heating temperature can be controlled to 450 DEG C, and the price is low. The method is suitable for plugging removal of obstruction in an immovable string of a well with thick oil, high pour point oil and high wax-bearing oil and a non-circulation channel of a high pressure gas well, and is high in plugging removal efficiency, the nitrogen can escape rapidly, and the plugging materials can be taken out by gas flowback.

The invention discloses a pivot device with improved heat radiating efficiency and a flip type electronic device with the same. The pivot device with improved heat radiating efficiency comprises a fixed support frame, a pivot shaft, a cam sheet and a socle, wherein the pivot shaft is mutually fixed with the fixed support frame; the cam sheet can be rotationally sleeved outside the pivot shaft; a lifting arc segment and a stable arc segment which are continuously arranged are arranged on the circumferential edge of the cam sheet; the radius of the lifting arc segment is smaller than that of the stable arc segment; the end face of the scole is supported against the circumferential edge of the cam sheet; and the cam sheet is supported against the lifting arc segment or the stable arc segment in the rotating process. When the electronic device is to be opened for use, an upper cover drives the cam sheet to rotate, pushes the scole to extend towards the outside of a base and support against the tabletop and further lifts the base, so that a heat radiating long hole of the base is away from the tabletop and can be used for accelerating the dissipating of heat to the air and further the integral heat radiating efficiency is improved.

The invention discloses a method for preparing a rubber shock pad, which belongs to the technical field of a high-molecular material. The method comprises the following steps: mixing rice husk fiber,secondary sedimentation tank sludge, sucrose and water, performing fermentation, adding a ferric chloride solution, stirring and mixing the materials, adding ammonia water to adjust the pH, and performing steps of filtering, washing, drying, and heat-insulating carbonization to obtain pretreated rice husk fiber; performing high temperature treatment on the pretreated rice husk fiber by steam, anddrying the material to obtain modified rice husk fiber; masticating the hydrogenated nitrile rubber, then adding natural resin, the modified rice husk fiber, a modified additive, a vulcanizing agent,an accelerator, an anti-aging agent, and a plasticizer for mixing, applying an external magnetic field during a mixing process, and after mixing is completed, performing extrusion molding, vulcanization, and discharging to obtain the rubber shock pad. The rubber shock pad produced by the technical scheme of the invention has the characteristics of excellent shock absorption performance and aging resistance.

The invention discloses a natural gas hydrate reaction device which is characterized by comprising a gas supplying system, a water supplying system, a cooling system, a spray reaction system, a measuring system and an adjusting system, wherein the gas supplying system is connected with the spray reaction system, the water supplying system is connected with the spray reaction system, the two sidesof the cooling system are respectively connected with the spray reaction system, and the measuring system is arranged on the spray reaction system; the spray reaction system comprises an atomizing nozzle, a reaction pipe and a reaction kettle; the atomizing nozzle at the inlet end of the reaction pipe can make natural gas and water be scattered in a fog shape, so that a gas-liquid mixing efficiency is fully improved; furthermore, the reaction pipe is in a spiral coil shape, so that a flow rate and disturbance of gas-liquid two-phase flow are improved, a gas-liquid mass transfer efficiency is further improved; in addition, a heat exchange area is increased, reaction heat can be quickly radiated, a heat transfer efficiency is also improved, and the advantages of increasing hydrate reaction driving force and shortening induction time are achieved.

The invention discloses a multistage mixing type energy consuming and shock absorbing device. The multistage mixing type energy consuming and shock absorbing device comprises mass blocks, a pendulum box and an outer box body. The mass blocks are installed on the outer box body and are connected with the outer box body through vertically-arranged springs, the pendulum box is fixed to the bottom of the mass blocks through a connecting device, and the pendulum box is connected with the outer box body through horizontally-arranged springs; a spring is hung in the pendulum box, and a metal pendulum ball is connected with the bottom of the spring; permanent strong magnet blocks with opposite magnetic poles are fixed to the top and the bottom of the pendulum box, magnetic induction line is cut when the metal pendulum ball swings in the space, and thus electrical eddy current is formed in the metal pendulum ball, and an electromagnetic field is formed by the induced electrical eddy current to impede relative motion of the pendulum ball; and thus mechanical energy is converted to electric energy to be consumed; the inner part of the outer box body is filled with water to form a TLD device, the TLD device can shake under the effect of external force, and inertial force opposite to the structure is generated, meanwhile water can collide with the pendulum box and the outer box body to consume the energy of structural vibration, and multistage and effective energy consumption and shock adsorption are achieved.

The invention provides a magnetic liquid damping shock absorber based on first-order and second-order buoyancy principles. The magnetic liquid damping shock absorber comprises a shell, a first permanent magnet, a second permanent magnet, a non-magnetic shell, a suspension permanent magnet, first magnetic liquid and second magnetic liquid. A first closed cavity is defined by the shell. The first permanent magnet and the second permanent magnet are both arranged on the shell. The non-magnetic shell is located in the first closed cavity; a second closed cavity is defined by the non-magnetic shell; and a first magnetic liquid cavity is defined between the non-magnetic shell and the shell. The suspension permanent magnet is located in the second closed cavity; and a second magnetic liquid cavity is defined between the suspension permanent magnet and the non-magnetic shell. A part of the first magnetic liquid cavity is filled with the first magnetic liquid; and a part of the second magneticliquid cavity is filled with the second magnetic liquid. The magnetic liquid damping shock absorber provided by the embodiment of the invention has the beneficial effects of being excellent in shock absorption effect and more sensitive in response to small-amplitude and low-frequency vibration.

The invention provides a preparation method of a spray type chitosan aqueous solution wound dressing. The preparation method comprises the steps that firstly, chitosan is prepared into gel and dispersed into a glycerine water solution; secondly, carbon dioxide is continuously led into the glycerine water solution under the high-pressure and low-temperature condition to prepare a chitosan water solution; and thirdly the chitosan water solution is canned after being sterilized. Proper process parameters are selected by reasonably controlling the stirring rotating speed, the carbon dioxide leading amount and the high pressure range during gel preparation. The preparation method is simple in preparation process and ingenious in design, and the product is novel in form, convenient to use, free of binding and superior in comprehensive performance, and has quite good application prospects in wound repair.

The invention relates to the field of lighting, in particular to a variable focal length cloud desk lamp lighting device. The variable focal length cloud desk lamp comprises a light housing, a light source control circuit, a focal length varying device, heat dissipation equipment and a double-axis cloud. The variable focal length cloud desk lamp realizes a variable focal length structure with an adjustable beam angle by changing a distance between an LED light source and a lens; the complicated structure of the variable focal length structure is simplified; the focal length is adjusted by adopting a stepping motor, so that the focal length is varied more accurately; a duct type integral structure is adopted, a light-weight aluminum alloy LED lamp bead support is arranged inside the duct type integral structure, so that the heat dissipation property of the integral structure is greatly improved; the variable focal length cloud desk lamp lighting device intelligently follows the rotation, namely light moves with the movement of a cloud camera, so as to capture clearer night environment information; by remote wireless control, the levelness and the pitching angle of the equipment canbe adjusted.

The invention relates to the technical field of PCB structures, discloses a PCB. The PCB includes a substrate, a metal block, and a heat dissipating hole; the substrate has a stepped groove; the metalblock is arranged in the stepped groove and same as the stepped groove in shape, and a heat conduction medium is arranged between the top surface of the metal block and a component; the heat dissipating hole is formed in the substrate, and the heat dissipating hole and the metal block can be used for heat conduction. By forming a groove in the PCB, embedding the metal block making direct contactwith the component and forming the heat dissipating hole which can be used for heat conduction with the metal block, heat generated by the component and heat in a metal layer in the PCB can be timelyand rapidly dissipated, the heat dissipation performance of the PCB is improved, and the service life of the PCB and the component is prolonged.

A synchronous buck converter which provides an improved output current sensing circuit (608) and improved transient behavior during output current stepdown. Also disclosed is a multi-phase synchronous buck converter having improved output current sharing capability, and a multi-phase synchronous buck converter having improved load balancing capability. For improved output current sensing (608), a sensing circuit includes a sampling switch which operates synchronously on and off with the shunt MOSFET to sample the voltage across the RDS-ON of the shunt MOSFET, and to provide the sampled voltage to a variable gain amplifier. The sensing circuit also includes n RC circuit which implements a low pass filter whereby the output of the variable gain amplifier is substantially independent of the value of the inductor and the magnitude of any time varying component of the signal input to the sampling switch. When the device is packaged an MCM, the current sense circuit (608) gain can be trimmed based on the RDS-ON value. The current sense gain can also be adjusted according to the module temperature by using temperature sensitive devices inside the IC to eliminate the RDS-ON temperature variation, and according to the gate voltage to eliminate the RDS-ON variation due to gate voltage changes. For improved output current sharing (608), a sensing circuit for each converter stage generates an output signal representative of the output current provided by that converter stage. A master controller provides duty cycle control signals in a predetermined phase relationship for the switching transistors of the individual converter stages according to the difference between the output voltage from the multi-phase converter and a reference signal representing a desired voltage at the output node. A duty cycle trimming for each converter stage modifies the duty cycle control signals from the master controller to equalize as nearly as possible the currents provided by each stage.

The invention provides a gas tightness detecting device that is assembled to an open end of a workpiece directly to form sealed space, thereby detecting the overall gas tightness. The gas tightness detecting device comprising a mounting seat and an interface valve is fixedly connected to an open end of a semi-sealed workpiece by the mounting seat and is connected to the peripheral wall of the workpiece detachably and correspondingly. According to the invention, the high-precision gas tightness detecting device is operated to measure the pressure drop of a product cavity within specified time to detect whether the gas tightness is qualified without the need to immerse the product in water, so that the operation is simplified and the detection cost is lowered. The gas tightness detecting device can be assembled to an open end of a workpiece directly to form sealed space, thereby forming a part of a sealed cavity of a to-be-detected product, so that the interface gas tightness is detected, the wearing situation can be discovered conveniently, and the maintenance can be carried out timely.

A battery connecting guide sheet used for electrically connecting with a plurality of batteries, comprises a first sheetbody and a second sheetbody. The second sheetbody is attached on the first sheetbody and is physically and electrically connected with the first sheetbody. The second sheetbody is provided with a plurality of punched holes. The second sheetbody has larger conductivity and larger thickness than the first sheetbody, and the first sheetbody is physically and electrically connected with electrodes of the batteries. The battery connecting guide sheet formed by using mutual connection of two metal materials with different thickness and characteristics can effectively reduce the difficulty of welding the batteries and the guide sheet, and can allow a larger current in the processes of charge / discharge of batteries and facilitate rapid cooling in the processes of charge / discharge of batteries.

The invention provides a multistage yielding double-pipe restraint type self-resetting buckling-restrained support device, and the device comprises an inner restraint steel pipe, an outer restraint steel pipe, a first energy-consuming steel pipe, a second energy-consuming steel pipe, two guide pipes, two positioning plates, two positioning end plates, two outer end plates, two connecting end plates, two groups of butterfly springs and two inner end plates. The multistage yielding double-pipe restraint type self-resetting buckling-restrained support device can yield for multiple times in stagesunder the action of an earthquake, and has equivalent self-resetting capability when the support is pressed or pulled, so that the symmetry of a tension-compression hysteresis curve of the support isensured, and the stress performance of the support is stably exerted.

The invention discloses a heat sink structure double-carrier LED (Light-Emitting Diode) drive circuit package and a manufacturing method thereof. The package comprises a power device and a control chip both fixed on base islands, the control chip is connected with the power device and an inner pin, the power device is connected with the inner pin, the inner pin is connected with an external pin, and sealant bodies are arranged on the base islands by plastic packaging; the base islands are two mutually isolated base islands, the power device is adhered on one base island through a conductive adhesive film, and the bottom surface of the base island, opposite to the power device, is located outside the sealant body; and an IC control chip is adhered on the other base island through an insulating adhesive film. The back surface of a wafer is coated with an insulation paste, the wafer is adhered on the base island after being cut into single crystalline grains, the power device is adhered on the other base island, and pressure welding, plastic packaging, curing and detection are carried out through the existing technology; the bottom surface of the first base island, without any adhered device, is located outside the sealant body, and thus, the heat sink structure double-carrier LED drive circuit package is obtained. The package can quickly dissipate a large amount of heat, the insulation paste is not liable to be broken down, and the insulation paste and the conductive adhesive are not interpenetrative to each other.

The invention discloses an antistatic fabric and a manufacturing method thereof, and relates to the field of functional clothes. The technical scheme is characterized by comprising the steps as follows: a), preparing SiO2 hydrosol; b), preparing conductive AZO@TiO2 nanowhiskers; c), weighing a certain proportion of the conductive AZO@TiO2 nanowhiskers and the SiO2 hydrosol according to the titanium / silicon ratio being 1:2, mixing the conductive AZO@TiO2 nanowhiskers with emulsion to form hydrosol, mixing conductive AZO@TiO2 nanowhisker sol with the SiO2 hydrosol, performing ultrasonic treatment at room temperature for 10 min, and performing magnetic stirring for 1 h to obtain SiO2 / AZO@TiO2 composite hydrosol, wherein Si and Ti account for 0.75% in percentage by mass; d), impregnating the fabric with composite hydrosol; e), performing cleaning. The fabric has the technical effects that the SiO2 / AZO@TiO2 composite hydrosol can form a layer of continuous gel network conductive film on thesurface of the fabric, and the surface of the fabric can rapidly dissipate charges to prevent the charges from accumulating, and the fabric can be endowed with excellent antistatic performance.