179results about How to "low density" patented technology

The invention provides methods for controlling the density of different molecular species on the surface of a solid support. A first mixture of different molecular species is attached to a solid support under conditions to attach each species at a desired density, thereby producing a derivatized support having attached capture molecules. The derivatized support is treated with a second mixture of different molecular species, wherein different molecular species in the second mixture bind specifically to the different capture molecules attached to the solid support. One or more of the capture molecules can be reversibly modified such that the capture molecules have a different activity before and after the second mixture of molecular species are attached. In particular embodiments, the different molecular species are nucleic acids that are reversibly modified to have different activity in an amplification reaction.

A stud panel and method of making a stud panel where interior sheathing may be a temporary piece of transparent plastic or a permanent panel of sheet rock so as to retain insulation in place and minimize scarfing. The stud panel may include studs having through holes extending in a length direction of the stud panel such that insulation in adjacent inner regions separated by such studs interlock with each other and contribute to a structural integrity of the stud panel. The stud panel may include a space between inner studs and one of the exterior and interior sheathing so as to provide a thermal and sound break between the exterior and inner sheathing so as to minimize heat, air and sound transfer between the exterior and interior sheathing. A method of making the stud panel is further disclosed, where such a method may include the step of incrementally introducing insulation from a closed end of an inner region to an open end of an inner region and may further include the step of automatically introducing insulation into the inner regions of the stud panel.

Surgical devices, systems and methods for treating tissue. An exemplary surgical device comprises a tip portion including first and second jaws each having a tissue grasping surface, at least one of the jaws being movable toward the other jaw. The tissue grasping surface of each jaw has includes an electrically insulative surface. The device also includes first and second electrodes connectable to different terminals of an RF generator to generate electrical current flow therebetween, with each of the electrodes having an electrode surface. One of the electrode surfaces is located on one of the jaws separated from one edge of the tissue grasping surface, and the other of the electrode surfaces is located on one or the other of the jaws separated from the other edge of the tissue grasping surface. The device also includes at least one fluid passage being connectable to a fluid source.

A method for configuring a solar hydrogen generation system and the system optimization are disclosed. The system utilizes photovoltaic modules and an electrolyte solution to efficiently split water into hydrogen and oxygen. The efficiency of solar powered electrolysis of water is optimized by matching the most efficient voltage generated by photovoltaic cells to the most efficient input voltage required by the electrolysis cell(s). Optimizing PV-electrolysis systems makes solar powered hydrogen generation cheaper and more practical for use as an environmentally clean alternative fuel.

The present invention relates to a magnetic memory device which additionally comprises a free magnetic layer constituting a horizontal direction variable magnetization layer having a fixed saturation magnetization value, whereby a switching current is markedly reduced as compared with conventional magnetic layers such that a high degree of integration of the device can be achieved and it is possible to lower a critical current density necessary for magnetization reversal thereby reducing the power consumption of the device. Also, a stray field effect occurring from a fixed magnetic layer is reduced such that a written magnetization data is thermally stable.

The invention belongs to the technical field of oil fracturing propping agents and relates to a method for preparing a light fracturing propping agent for a multi-hole oil and gas well. The fracturing propping agent is prepared by taking alumina as a main material, adding one or a plurality of components of limestone, dolomite, magnesite, wood dust and plant chip as pore-forming substance, one or a plurality of components of bentonite and kaolinite as plasticizer, and one or a plurality of components of starch and dextrin as binder; grinding the materials into fine powder, mixing and stirring evenly, rolling to form balls in a granulator, then sintering in a tunnel kiln or a rotary kiln after drying, and finally screening to control the particle size distribution to obtain the light fracturing propping agent for multi-hole oil and gas well. The invention has simple material formula and preparing process and no pollution and is suitable for large-scale production.

A metal film composed of multiple atomic layers continuously formed by atomic layer deposition of Ru and Ta or Ti includes at least a top section and a bottom section, wherein an atomic composition of Ru, Ta or Ti, and N varies in a thickness direction of the metal film. The atomic composition of Ru, Ta or Ti, and N in the top section is represented as Ru_(x1)Ta/Ti_(y1)N_(z1) wherein an atomic ratio of Ru_(x1)/(Ta/Ti_(y1)) is no less than 15, and z1 is 0.05 or less. The atomic composition of Ru, Ta or Ti, and N in the bottom section is represented as Ru_(x2)Ta/Ti_(y2)N_(z2) wherein an atomic ratio of Ru_(x2)/(Ta/Ti_(y2)) is more than zero but less than 15, and z2 is 0.10 or greater.

The present invention is directed to composite metal foams comprising hollow metallic spheres and a solid metal matrix. The composite metal foams show high strength, particularly in comparison to previous metal foams, while maintaining a favorable strength to density ratio. The composite metal foams can be prepared by various techniques, such as powder metallurgy and casting.

Carbon-base bipolar electrode for electrochemical redox reactions in an acid electrolyte in the form of a fluid impervious and electrically conductive septum, at least a face of which consists, at least partially, of a fluid previous woven or unwoven electrodically active fabric of carbon fibers or of yarns of carbon fibers, has an electrically conductive fluid impervious septum consisting of a composite of a matrix fabric in the form of a tightly knit or woven fabric of carbon fibers or of yarns of carbon fibers the pores of which are hydraulically sealed by an electrically conductive carbon containing material at least partly filling the pores of said matrix fabric. The carbon containing electrically conductive material may be a glassy carbon formed in situ by thermal conversion of a precursor material with which said matrix fabric is pre-impregnated or a polymerized thermosetting resin loaded with carbon and/or graphite particles and/or fibers or a thermally reflown aggregate of a thermoplastic resin an carbon and/or graphite particles and/or fibers. The pervious fabric on the face of the electrode may be a raised pile of carbon fibers.

A shear layer for a shear band that is used in a tire is provided that has multiple cells having a chiral configuration. The chiral configuration may be hexagonal or tetrachiral or have other configurations.

The invention discloses a preparation method of a graphene composite aerogel absorbing material and application thereof. The material is obtained by one-step reduction self-assembled reaction on reduced graphene oxide, a polymer A and magnetic nano particles which wrap a polymer B. The absorbing material is low in density and high in absorbing strength, effectively absorbs bandwidth, and has excellent absorbing property on an X wave band. In the absorbing material, the content of graphene is low, the cost is low, and therefore, the graphene composite aerogel absorbing material has wide application potential and market prospect in the field of invisibility of aircrafts, electromagnetic shielding of radar and communication equipment, and electromagnetic safety protection.

A plastic film having a thickness of less than 400 μm has a base layer at least partially of polyolefin of renewable raw material or a polyolefin mixture of renewable raw material and a first layer foamed by at least 20%.

The invention discloses a method for preparing a porous silicon-nitride ceramic material, which comprises the following steps of: stirring starch and water at the temperature of 40-90 DEG C to prepare pre-gelatinized starch; adding silicon nitride, a sintering aid, a bonding agent and a defoaming agent to the pre-gelatinized starch, and uniformly mixing through ball milling to prepare a mixed slurry; molding the mixed slurry through casting, and carrying gout degassing, curing, complete sample-freezing and freeze-drying processing to prepare a porous silicon-nitride ceramic blank body; removing organic volatile substances in the porous silicon-nitride ceramic blank body through heating; and sintering, and cooling a sample along with a furnace after sintering. The silicon-nitride ceramic material prepared by utilizing the preparation method disclosed by the invention has high open porosity (which can reach 60-90 percent) and low density (0.32-1.28g/<cm>3), the bending strength can be regulated within the range of 5-140MPa, and the application-performance requirements of materials in the fields of high-temperature gas and liquid filtration, purification and separation, chemical catalytic carriers and the like can be met.

The invention discloses a TiC-WC base alloy guide roll and spool, valve seat in the metal ceramic and hard alloy manufacturing domain, which comprises the following parts: 30-60 wt percent TiC, 15-55 wt percent WC and 0-3 wt percent Ta as hard phase, 10-30 wt percent Co+Ni as adhesive phase and 0-3.0 wt percent Cr as grain growing inhibitor. The density of product is 0.3-0.5 times as WC base hard alloy density with 2500 N per mm2 anti-bending strength and 87.0-90.5 percent rigidity HRA, which possesses light quality, high rigidity and abrasion-proof property.

Fiber-reinforced thermoplastic composites containing hollow bubbles provide surprisingly low density and retention of robust physical properties.

The invention discloses a noctilucent artificial stone and a preparation method thereof, belonging to the field of building decoration material. The noctilucent artificial stone contains, by weight percent, 0%-75% of inorganic filling, 20%-84% of unsaturated polyester resin or methacrylic acid type resin, 0%-6% of color paste, 0.5%-1.5% of coupling agent, 0.3%-20% of noctilucent material, 0.5%-11% of thermally expandable microcapsule, 0.5%-3% of nano titanium dioxide, accelerant which is 0.3%-2% of the content of the unsaturated polyester resin or methacrylic acid type resin, and curing agent which is 0.5%-3% of the content of the unsaturated polyester resin or methacrylic acid type resin. The nano titanium dioxide added to the artificial stone enables the surface of the artificial stone to have the functions of decomposing oil stains, removing bad smell, sterilizing and self-cleaning. Since the noctilucent material can absorb light and give out light naturally, the artificial stone can give out soft light at night. The specific gravity of the thermally expandable microcapsule is ultra-low, so the density of the artificial stone product can be greatly reduced.

The invention discloses a method for manufacturing a foam ceramic heat-insulation plate with closed pores. The method includes mixing from 50 to 70% of fly ash, from 10 to 25% of Ninghai clay micro-powder, from 5 to 20% of glass powder, from 5 to 10% of talc powder and from 0.7 to 3% of foaming agent to obtain mixture, and dry-grinding the mixture to obtain uniformly mixed powder; and flatly laying the powder in a sagger with alumina powder flatly laid at the bottom, sintering the powder in a sagger with the alumina powder flatly laid at the bottom in oxidizing atmosphere at the temperature ranging from 1230 DEG C to 1260 DEG C, for 0.5 to 2 hours, cooling along with a furnace, and obtaining the foam ceramic heat-insulation plate. The fly ash is used as a main raw material for manufacturing the foam ceramic heat-insulation plate, and accordingly the method is favorable for saving natural resources, reducing production cost and protecting environments. In addition, the fly ash has hollow micro-beads and a honeycomb body which have characteristics of low heat conductivity, high-temperature resistance and the like. Besides, the closing porosity of foam ceramics reaches 75% at least, and the tensile strength reaches 0.2MPa at least.

The invention discloses a glass bead polyurethane foam composite material and a preparation method thereof, relating to a composite material and a preparation method thereof. Through the invention, the technical problems that the existing thermal insulation material is high in cost and the flame retardance and heat retaining property are hard to improve synchronously are solved. The glass bead polyurethane foam composite material is prepared by mixing the pretreated glass bead, polyurethane white material, polyurethane black material and solid flame retardant and then performing microwave auxiliary heating, foaming compounding and curing. The method comprises the following steps of: (I) glass bead pretreatment; (II) weighing; (III) mixture preparation; (IV) microwave auxiliary heating and foaming compounding; and (V) curing. The glass bead polyurethane foam composite material disclosed by the invention has low density (90-120kg/m<2>), high strength (144-320KPa), high flame retardance (the limiting oxygen index can reach 34.7%), and lower cost (the raw material cost is reduced by about 37.5% in comparison with the flame-retardant hard polyurethane foam with the same density).

Method for producing small and micro conductive structures on surfaces by (hot) stamping and/or nanoscale imprinting microstructures on the surfaces, targeting conductive material into the channels thus created with the aid of capillary action, and appropriately after-treating the conductive material.

The present invention relates to a multimodal linear low density polyethylene composition for the preparation of a pressure pipe. The invention further relates to a pressure pipe, comprising said composition, a process for the manufacturing of a pipe made of the composition and to a process for the recycling of pipe material consisting of the composition according to the invention. Furthermore the invention relates to the use of the pressure pipe as an irrigation pipe, especially a drip irrigation pipe.

The invention provides a fireproof coating for thick formed steel constructions. The coating is prepared from a fireproof filler, a fire retardant, a main binder, an auxiliary binder, a water-proofing agent and mica powder; the binding performance of the fireproof coating for the steel constructions is improved, meanwhile, the dosage of the fire retardant is optimized and the long fire resistance of the fireproof coating for thick formed steel constructions is guaranteed; other auxiliaries as the water-proofing agent are added to improve the water tolerance, anti-penetrability performance and weather fastness of the fireproof coating for the steel constructions are improved. The fireproof coating for the steel constructions has the characteristics of water tolerance, anti-permeability, fire resistance, impact resistance, simple preparation process, convenience for application, non-toxicity and harmlessness, long service life and the like. The fireproof coating for thick formed steel constructions is suitable for fireproof protection of the exposed parts of steel construction buildings high in fire endurance.

The complex piezoelectric material is composed of the parallel-connected complex material, the piezoelectric crystal base plate, the upper and lower electrodes. The parallel connection piezoelectric material is composed of the piezoelectric crystal skeleton and the epoxy resin, the parallel-connected piezoelectric complex material is fixed on the piezoelectric crystal base plate. The parallel-connected piezoelectric complex materials is connected with the crystal base plate. The series-parallel connection combination is supported by the ceramics skeleton with the property of parallel connected and series connected piezoelectric complex material.

Reaction injection molded (RIM) members and a method for forming such members are provided. The members can be formed in a mold cavity defining a contour that corresponds to the desired contour of the members. A foam material, such as a combination of polyol and isocyanate is injected into the cavity with a blowing agent so that the foam material expands to form the low density member. The average density of the member can be less than about 6 pounds per cubic foot.

The invention provides a reinforced magnesium-lithium alloy of a long-period structure and a preparation method of the reinforced magnesium-lithium alloy. The magnesium-lithium alloy is composed of, by weight percentage, 11-16% of Li, 1-5% of Y, 0.2-2% of Zn, 0-0.6% of Zr and the balance Mg and inevitable impurities, wherein the total amount of Si, Fe, Cu and Ni is less than 0.02%. The preparation method of the magnesium-lithium alloy comprises the steps of smelting under the atmospheric environment and thermal treatment in a common furnace, wherein the smelting process comprises the steps of drying materials, smelting magnesium, adding Y, adding Zn, adding Zr, adding Li, performing refining and performing casting. Double-stage solution treatment is mainly adopted in the thermal treatment process, that is, 300-400 DEG C solution treatment is conducted for 2-10 h, then 200-300 DEG C solution treatment is conducted for 2-6 h, and the cast alloy with the LPSO structural phase is obtained through phase transformation. According to the reinforced magnesium-lithium alloy and the preparation method, the Y element and the Zn element are added to the magnesium-lithium alloy, the LPSO structure phase is introduced into a magnesium-lithium alloy substrate, and the cast magnesium-lithium alloy material with the low density, high strength and good thermal resistance is prepared.

The invention discloses a fibrous material with a formaldehyde removal function, and belongs to the technical field of poisonous volatile matter removal. Cation exchange fibers are used as base body materials in the fibrous material, and counting the total mass of the fibrous material by 100%, the fibrous material comprises, by mass, 24.8%-88.95% of the cation exchange fiber, 0.05%-0.2% of surface active agent, and 11%-75% of macromolecule organic amine compound. The preparation method of the fibrous material includes the following steps: (1) preparing steeping liquor according to proportion, (2) adding fibers into the steeping liquor and evenly stirring the fibers, (3) soaking the fibers in the steeping liquor for 2-4 hours under the condition of interval stirring, (4) and fishing out the soaked materials, drying the materials with hot air or natural air. The fibrous material is diversified in application form, has no secondary pollution, and is large in formaldehyde adsorption capacity, high in adsorption speed, simple in preparation process, and low in cost.

The invention provides a high Nb containing TiAl porous intermetallic compound gradient material and a preparation method thereof, belongs to the technical field of itermetallic compounds, and relates to a method for preparing the intermetallic compound porous material. The method comprises four parts, namely (1) preparing a high Nb containing TiAl (Ti-48Al-(5-10)N bat. percent) porous intermetallic compound by adopting a powder metallurgical vacuum sintering process, wherein the porosity is between 30 and 60 percent; (2) mixing Ti powder, Al powder and Nb powder for 8 hours according to the atomic percentage (Ti-48Al-(5-10)N bat. percent), and drying the mixed powder to prepare a cold-spraying powder; (3) cleaning the high Nb containing TiAl coarse porous substrate material prepared in the step (1), and depositing the cold-spraying powder which is prepared in the step (2) onto the coarse porous substrate at one time; and (4) performing vacuum insulation sintering by adopting a three-stage sintering process to obtain a fine pore-coarse pore composite gradient porous material. The method has the advantages that the mixed powder of the Ti powder, the Al powder and the Nb powder is directly sprayed on the outer surface of the high Nb-TiAl porous material, and the process is simple and efficient.

This invention comprises reinforced aerogel monoliths such as silica aerogels having a polymer coating on its outer geometric surface boundary, and to the method of preparing said aerogel monoliths. The polymer coatings on the aerogel monoliths are derived from polymer precursors selected from the group consisting of isocyanates as a precursor, precursors of epoxies, and precursors of polyimides. The coated aerogel monoliths can be modified further by encapsulating the aerogel with the polymer precursor reinforced with fibers such as carbon or glass fibers to obtain mechanically reinforced composite encapsulated aerogel monoliths.

The invention relates to a shielding coating and a preparation method and application thereof. The shielding coating is formed by mixing a component A and a component B with the mole ratio of (-OH): (-NCO) being 1:1, wherein the component A is prepared from the following raw materials in parts by weight: 25 to 55 parts of fluorine-modified acrylic resin, 5 to 25 parts of elastic polyester resin, 20 to 30 parts of an electromagnetic shielding filler, 1.5 to 4 parts of an assistant, and 5 to 10 parts of a mixed solvent; and the component B adopts isocyanate. The electromagnetic shielding coatinghas electric conductive and magnetic conductive characteristics, and is wide in electromagnetic shielding response frequency band; the electromagnetic shielding coating is low in density, and meets the development direction of light weight; and the coating is convenient for construction, and can be coated in brush coating, spray coating and roll coating manners.

An insulating material for wall surface is prepared from the basic material which is light calcium carbonate particles coated by stearic acid, expanded pearlite, silicate cement, polyvinyl alcohol adhesive, carboxymethyl cellulose, Na-base bentone and polypropylene fibres. Its advantages are high mechanical performance, less deformation and high insulating effect.

The invention provides a dynamic and static combined loading rock fracture characterization test device and method matched with an industrial CT machine, and belongs to the technical field of geotechnical mechanics. The test device comprises an axial pressure system, a confining pressure system, a rotating system and a scanning system; the axial pressure system realizes axial dynamic and static combined stress disturbance loading on a sample, the confining pressure system applies confining pressure to the sample, the rotating system drives the testing machine to rotate through a turntable, andthe scanning system obtains an absorption coefficient of a scanned object through a series of scanning at different angles and performs three-dimensional imaging. According to the invention, the industrial CT scanning technology is utilized, the mesoscopic damage and dynamic fracture evolution process of the rock under dynamic and static combined stress disturbance is observed in real time, and the fracture evolution process of the rock is visually and digitally characterized. The pressure chamber is made of carbon fibers made of special materials and has the advantages of being high in strength and small in density, the ray energy attenuation condition when X-rays penetrate through the pressure chamber is improved under the condition that the function requirement is met, and the triaxialcylinder wall of the pressure chamber bears loading counter-acting force.