229results about How to "Low areal density" patented technology

The present invention relates to a lithium-ion battery anode or cathode pole piece and a spreading method of the anode pole piece or the cathode pole piece, wherein, the anode pole piece and the cathode pole piece consists of a foil, a conducting adhesive thin layer and an electrode active material layer in turn; the thickness of the conducting adhesive thin layer is five to ten microns. The electrode pole piece is made in the procedures that a layer of conducting adhesive thin layer in the thickness of five to ten microns are pre-coated on the surface of the foil before the sizing agent is spread, so that a conducting adhesive thin layer having good adhesive force, good conductivity and compact structure is formed on the surface of the foil. Then the electrode active material sizing agent is spread on the conducting adhesive thin layer, and is dried under an appropriate temperature to produce a required pole piece. The present invention can reduce the surface of the foil, and can improve the wetting quality of the sizing agent, thereby improving the adhesion performance of the anode material and the collecting body (aluminum foil) so as to reduce the powder-dropping of the battery during the cycling process, and to prolong the cycling service life of the battery; moreover, the present invention can reduce the content of the adhesive agent in the sizing agent, and improve the utilization rate of the active substance, and the method of the present invention does not produce negative influence on the performance of the battery.

A composite woven fabric made up of at least two plies of individual woven fabrics bonded together by a layer of flexible bonding resin disposed on juxtaposed surfaces of the individual woven fabrics. The bonding agent covers at least about 75%, preferably 100%, of the juxtaposed individual fabric surfaces and does not exude through the interstices of the woven fabric. The thus constituted fabric material is very good for use in making an anti-ballistic composite fabric. An anti-ballistic composite fabric is made up of at least one of these bonded woven fabrics sub-composites, preferably in combination with conventional non-woven fabric layers. This composite product has an exceptionally low areal density but still can withstand the impact of a 44 magnum projectile. It also offers excellent protection against knife and ice pick threats. One attribute of this composite fabric is its ability to reduce the trauma conventionally caused by the impact of a ballistic projectile, even though the projectile is stopped from penetrating the fabric.

The continuous tow dispersing device includes unwinding roller, winding roller and tightening roller, as well as air separator and carding unit set successively between the unwinding roller and the winding roller. The air separator has a hollow barrel, and a tow separating cavity in the upper port of the hollow barrel with a tow separating plate with ventilating holes in the bottom and a closing cover plate in the top. The carding unit has a box; inside the box, there are horizontal upper plate with at least two parallel air slots, lower plate with air holes and carding groove between the upper plate and the lower plate; and on the box, there is mechanical vibrator. The device has simple structure, no need of outer power, tow dispersing action completed with air pressure, good tow dispersing effect, low tow damage and other advantages.

The invention discloses a novel infrared and radar integrated stealth fabric and a preparation method thereof. The stealth fabric comprises an infrared camouflage surface layer and an antistatic bottom layer in turn from outside to inside; the infrared camouflage surface layer comprises an infrared stealth layer, a fabric layer and a radar wave absorption attenuation layer in turn from outside toinside; the infrared stealth layer is compounded by using a coating coated by an infrared stealth coating and a magnetron sputtering ITO (indium tin oxide) film arranged on the surface of the coating; the radar wave absorption attenuation layer comprises a sponge body; and a wave absorption material is adsorbed on the sponge body. The stealth fabric can realize radar stealth function and infraredstealth function at the same time, has good integral wave absorption effect and low surface density of materials, and has good effects on the aspects of breaking strength, bursting strength and the like. Moreover, excessive complex processes are not adopted for manufacturing the stealth fabric, and the stealth fabric can be produced by using a conventional fabric production method, so the stealthfabric is convenient for production and easy for implementation.

In the invention, the composite bullet-proof armour plate consists of a metal panel, a honeycomb core board, a ceramic wafer core and a metal rear panel bonded with the metal brazing layer via the organic adhesive layer. The preparing method is that using the brozing and the line-cutting method are finished the honeycomb core board and the plain or curved ceramic wafer core, whose size must fit in that of the honeycomb hole of the honeycomb core board. The panel and the rear panel must be made of the bullet-proof steel plate through heat treating after cold rolling. The Ag72Cu metal brazing material and the epoxy resin group high strength structural sizing for connecting the interface are assembly welded.

The invention relates to a broadband wave absorption composite material with a multilayer structure and a preparation method thereof. The broadband wave absorption composite material is characterized in that the material comprises three parts, namely a surface layer, a sandwich layer and a bottom layer; the surface layer comprises, by mass percentage, 20 to 50 percent of carbonyl iron dust, 30 to 48 percent of polymer and 20 to 32 percent of fiberglass cloth; the sandwich layer comprises, by mass percentage, 2 to 6 percent of carbon nanometer tube, 56.4 to 58.8 percent of polymer and 37.6 to 39.2 percent of fiberglass cloth; and the bottom layer comprises, by mass percentage, 50 to 80 percent of carbonyl iron dust, 12 to 30 percent of polymer and 8 to 20 percent of fiberglass cloth. The broadband wave absorption composite material has the advantages of low surface density, thin thickness and high mechanical strength, and improves the bearing performance and the engineering application value.

A base station apparatus is provided for adaptively controlling a maximal accommodation channel number per unit area (for example, the coverage area of a cell or sector) in accordance with a traffic quantity without relying upon detachment of a mobile base station and installation of a repeater. Upon inputting of a plurality of baseband signals of a user channel-multiplexed channel group, linear coupling is performed by a weight which is different per area that outputs it, thereby enabling control of the channel density. Additionally, a per-group available channel number is constantly monitored to control the weight while using threshold judgment for the available channel number as a trigger, thus achieving situation-sensitive prompt handleability.

The invention discloses a deployable surface device with a fixed truss structure, which mainly aims to solve the problems of high areal density, complicated structure, low deployable reliability and the like in the prior art. The device comprises a plurality of folded rings and connection joints, wherein every two folded rings (2) are connected by one ring connection joint (1) so as to form a circular foldable and deployable ring structure; each folded ring adopts a rectangular or regular triangle hollow straight bar single-rowed truss structure; driven or locked by the ring connection joints, the folded rings are unfolded into an approximately curve working state from a vertically folded state; staggered flexible pulling ropes are arranged on the folded rings; and a wire mesh or a film of which the surface is coated with aluminum is bound to the pulling ropes, so that the deployable surface device with the fixed truss structure is formed. The deployable surface device with the fixed truss structure has high composite performance indexes such as low areal density, simple structure, high deployable reliability, capacity of transmitting or converging electromagnetic waves in a long distance and the like, and can be used as a reflector or a converging device in space or on the ground.

A system and methods for radar and communications applications. In one embodiment the present system comprises a wireless, space-fed, phased array of antennas including a plurality of unit cells. A first one of the unit cells includes a first one of the antennas and a unit cell command interpreter configured to receive a command, determine whether the command is intended for the first unit cell, and relay the command to logic for enabling a phase shift controller of the first antenna. In one embodiment the present methods comprise the step of wirelessly beaming microwave power from a power and control beam transmit unit to illuminate a wireless, space-fed, phased array of antennas including a plurality of unit cells. The method further comprises the steps of beaming a command to the array and converting the microwave power into direct current within a first one of the unit cells. The first unit cell includes a first one of the antennas. The method further comprises the steps of supplying the direct current to components of the first unit cell to power the first unit cell, receiving the command within the first unit cell, determining whether the command is intended for the first unit cell, and relaying the command to logic for enabling a phase shift controller of the first antenna.

The invention relates to a method for preparing an active layer structure with high-density gallium nitride quantum dots; the method comprises the following steps of: (1). depositing a layer of SiO or SiNx dielectric thin film material with the thickness of 10-50nm on a GaN template or surfaces of other semiconductor films, painting a mixing copolymer of PS (Polystyrene) and PMMA (Polymenthyl Methacrylate) on the surface of the dielectric thin film, obtaining a PS nanometer column graph after cleaning the PMMA, transferring the PS nanometer column graph to the dielectric thin film layer by adopting plasma etching, wherein the PS nanometer column graph is prepared according to the following parameters: (1) the surface density reaches 0.8-1.0*1011cm<-2>; (2) the PS nanometer column graph istransferred to the SiNx or SiO2 dielectric thin film layer by adopting reactive ion etching, the PP is removed to obtain a template on which a GaN nanometer point structure grows for the second time through MOCVD (Metal-organic Chemical Vapor Deposition); and (3) a GaN-base quantum dot structure grows, emits strong royal purple light and is used for manufacturing the active layer structure in a light-emitting diode (LED) with high efficiency and a laser device (LD) optoelectronic device.

The invention discloses a centimeter wave-millimeter wave compatible absorbing composite material. The material has a five-layer structure including a substrate which is an irregular surface made of a random material, a topmost first layer which is composed of a W-shaped hexagonal ferrite absorbent and a acrylic resin adhesive, a second layer which is composed of a carbonyl iron powder absorbent and an epoxy resin adhesive, a third layer which is composed of an Fe85Si1Al6Cr8 nanocrystalline sheet-like absorbent and an epoxy resin adhesive, a fourth layer which is composed of a polycrystallineiron fiber absorbent and an epoxy resin adhesive, and a fifth layer which is composed of a short carbon fiber/carbon black mixed absorbent and a polyurethane adhesive. The material can well solve theproblem of poor centimeter wave-millimeter wave compatible absorbing performance in the prior art, and is a composite wave-absorbing material compatible with electromagnetic waves of centimeter wave-millimeter wave bands.

The invention belongs to a design technology of protecting structures and relates to an improved /composite material protecting structure, which comprises a ceramic panel (1) and a rear panel bonded with the ceramic panel (1). The ceramic/composite material interlayer protecting structure is characterized in that the rear panel is an interlayer panel which comprises two fiber reinforced resin base composite material plates (2) and a foam aluminum plate (3) clamped between the two fiber reinforced resin base composite material plates, and the fiber reinforced resin base composite material plates (2) and the foam aluminum plate (3) are formed into the interlayer plate bonded by plate cores. The interlayer structural rear panel provides support with greater rigidity for the ceramic panel under the condition of same planar density and fully plays a role of high compression strength of ceramic materials. Closed cell aluminum in the interlayer structure can also delay the transmission of shock waves along the thickness direction when a bullet is shocked, delays the damage of the shock waves to the ceramic panel, and improves the ballistic curve limit speed of an integral protecting structure.

The invention discloses a heterogeneous metal stacked grid strained silicon-germanium on insulator p-channel metal oxide semiconductor field effect tube (SSGOI pMOSFET) device structure, which comprises a heterogeneous metal stacked grid structure, a grid insulation layer, an intrinsic or n-doped strained Si channel layer, a strained Si1-xGex layer of which an intrinsic or n-doped component is changed gradually, an n-doped relaxation Si1-yGey layer, a stepped oxygen buried layer and an n-doped substrate part sequentially from top to bottom, wherein the n-doped substrate part consists of four parts, namely an n<+>-doped relaxation Si1-yGey layer, an n<->-doped relaxation Si1-yGey buffer layer, an n-doped relaxation SiGe gradient layer and an n<->-doped monocrystal Si(100) substrate. The device has a simple structure, can be totally compatible with the conventional Si silicon on insulator (SOI) process, is integrated with the advantages of grid engineering, strain engineering and substrate engineering, and makes a complementary metal-oxide-semiconductor structure process simply integrated.

The present invention provides a material with characteristics of fire retardation, thermal insulation and wave absorption. The material comprises a base layer, wherein the base layer is mesh fabric, both sides of the mesh fabric are coated with an adhesive coating layer, and the adhesive coating layer is a polyvinylchloride adhesive coating layer. The adhesive coating layer comprises a wave absorption agent, wherein the wave absorption agent comprises nickel-plated glass beads, and a mass ratio of the wave absorption agent powder to the adhesive is 0.17-1.85:1. The present invention further provides a preparation method for the material. According to the material with characteristics of fire retardation, thermal insulation and wave absorption in the present invention, the polyvinylchloride adhesive is added with the wave absorption agent, such that functions of fire retardation, thermal insulation and wave absorption can be concurrently provided; the material of the present invention can concurrently has functions of fire retardation and thermal insulation, and characteristics of high wave absorption strength, wide wave absorption frequency band, and small surface density; and the material of the present invention can be used for wave absorption defilading, electromagnetic shielding, and the like.

The present invention relates to a SiC epitaxial wafer with a reduced surface density of a stacking fault, and a method for manufacturing the same. The method of the present invention comprises determining a stacking fault ratio at a SiC epitaxial membrane having a predetermined thickness formed on a SiC single crystal substrate in a basal plane dislocation (BPD) present at a growth plane of the SiC single crystal substrate having an off angle, determining an upper limit of a surface density of the BPD at the growth plane of the SiC single crystal substrate in use based on the ratio, and forming the SiC epitaxial membrane on the SiC single crystal substrate by using the SiC single crystal substrate below the upper limit in the same condition as a growth condition of the epitaxial membrane used when determining the ratio.

The invention relates to a method for producing a composite non-woven fabric material from irradiated ultrahigh molecular weight polyethylene (UHMWP) fiber. The method comprises the following steps of: (1) spreading a plurality of strands of ultrahigh molecular weight polyethylene fiber in parallel by using a guide roller after passing through a buncher, and impregnating the fiber in a grafting liquid; (2) irradiating the fiber impregnated in the grafting liquid to realize grafting, and sending the fiber into a glue dipping groove; (3) processing glue on double surfaces of adhesive-containing filament bundles by using parallel scrappers, and drying the filament bundles to obtain a one-way non-woven fabric; (4) producing composite non-woven fabric sheets or coils to obtain a composite non-woven fabric material. Compared with the prior art, the method has the advantages that an electron beam irradiation grafting technology is introduced into a UD cloth production method in the invention, so that the UHMWP fiber can be grafted and modified through mutual irradiation, and interfacial adhesive performances of the fiber and the adhesive can be improved; and therefore, the consumption of the adhesive is reduced during the production of the one-way non-woven fabric, application of a protective film is eliminated, and finally surface density of the composite non-woven fabric material is reduced.

The invention discloses stab-resisting cloth with an inorganic powder coating and a preparing method of the stab-resisting cloth. The stab-resisting cloth comprises the inorganic powder coating and base cloth. The inorganic powder coating and the base cloth are stuck through an adhesive layer. Inorganic powder in the inorganic powder coating is ceramic powder. The prepared finished slab-resisting cloth with the inorganic powder coating is a soft non-metal stab-resisting product and has good stab-resisting performance, the face density of a stab-resisting material of the stab-resisting cloth is reduced by 20% than that of a resin fiber composite material of the same base cloth, the overall thickness and weight are reduced to a great degree, and the service life of the stab-resisting material of the stab-resisting cloth is prolonged by 50% or above than that of a stab-resisting material containing metal. In addition, the prepared stab-resisting cloth has better softness, and the comfortable and flexible degree is better when the stab-resisting cloth is made into stab-resisting clothes to be worn.

The invention relates to a wave-absorbing material for a Ku waveband radar with a film structure, mainly comprising six wave-absorbing material layers and five plastic films, wherein the plastic films are arranged between every two wave-absorbing material layers of the six wave-absorbing material layers; the first wave-absorbing material layer is a mixture of 1.50 parts of coupling agents, 50 parts of diluents, 150 parts of ferrites and 53.67 parts of 60% epoxy resins; the second wave-absorbing material layer is a mixture of 1.50 parts of the coupling agents, 50 parts of the diluents, 150 parts of carbonyl iron absorbents, 39.83 parts of the 60% epoxy resins and 12.93 parts of curing agents; the third wave-absorbing material layer is a mixture of 1.50 parts of the coupling agents, 50 parts of the diluents, 150 parts of the carbonyl iron absorbents, 109.02 parts of the 60% epoxy resins and 33.10 parts of the curing agents; and the fourth wave-absorbing material layer, the fifth wave-absorbing material layer and the sixth wave-absorbing material layer are mixtures of 1.50 parts of the coupling agents, 50 parts of the diluents, 150 parts of the carbonyl iron absorbents, 39.83 parts of the 60% epoxy resins and 12.93 parts of the curing agents. The wave-absorbing material combines an impedance gradual change principle with an electromagnetic wave trap principle, has high wave-absorbing property within a Ku waveband range, little thickness, low surface density, light weight and good mechanical property and is suitable for resisting the Ku waveband radar.

The invention discloses a lithium battery composite membrane which is formed by coating a porous base membrane with nano sol and then drying the sol. The lithium battery composite membrane has the following performances: the surface density is 10.04-12.70g/m<2>, the thickness is 15.3-16.6 microns, and the gas permeability is 140-696s/100cc. If the discharged membrane is put into an oven, the temperature is set to be 105 DEG C or 130 DEG C and the set temperature is kept for one hour, the thermal shrinkage rate is 2.5-3.5 105 DEG C/TD, 2.5-3.0 105 DEG C/MD and 3.3-10 130 DEG C/TD, and 3.5-8.5 130 DEG C/MD. The composite membrane consists of the porous base membrane and an inorganic material high-temperature coating coated between the surface and holes of the base membrane, has good thermal stability, good quality and less thickness increase, can be used for preparing high-energy density lithium batteries and also has the characteristics of simple preparation process, low cost and the like.