157results about How to "Change conductivity" patented technology

A mechanical deformation amount sensor includes a sensor structure which is formed by a semiconductor substrate or an insulating substrate and integrally includes a deformation portion deformable, when a physical quantity to be detected is applied to the sensor structure, due to the physical quantity and a support portion for supporting the deformation portion, a carbon nanotube resistance element which is provided on the deformation portion so as to be mechanically deformed in response to deformation of the deformation portion and a wiring pattern which is formed in a pattern on the sensor structure so as to be connected to the carbon nanotube resistance element. By applying a voltage to the carbon nanotube resistance element via the wiring pattern, a change of electrical conductivity of the carbon nanotube resistance element upon mechanical deformation of the carbon nanotube resistance element is fetched as an electrical signal.

A cooling device for a fuel cell is provided which can maintain the electric conductivity of a liquid coolant within the predetermined range even if a load suddenly changes. In the cooling device for a fuel cell (10), the parameters (T_H, T_L) relating to the coolant temperature can be controlled so that the electric conductivity (S) at a target set temperature is maintained within a target electric conductivity range (S_max-S_min) based on the correlation between the parameters relating to the coolant temperature and the electric conductivity of the coolant. Because the electric conductivity is feed-forward controlled based on the correlation between the parameters relating to the coolant temperature and the electric conductivity of the coolant, the electric conductivity of the coolant can be reliably maintained within the target range even when electric conductivity with a comparatively poor responsiveness is controlled.

The invention discloses a preparation method of a Ni3Fe-loaded nitrogen-doped carbon nanometer composite material, and a product and applications thereof. The preparation method comprises following steps: 1, a Ni<2+>/Fe<3+>/PVP mixed sol is prepared; 2, the Ni<2+>/Fe<3+>/PVP mixed sol is subjected to electrostatic spinning so as to obtain solid carbon fiber film; 3, the solid carbon fiber film issubjected to pre-oxidation at air atmosphere at 200 to 300 DEG C, programmed heating is adopted for heat processing at 400 to 1000 DEG C at an inert atmosphere so as to obtain the Ni3Fe-loaded nitrogen-doped carbon nanometer composite material. The preparation method is low in cost, is easy, and is universal; the obtained Ni3Fe-loaded nitrogen-doped carbon nanometer composite material is of a one-dimensional composite structure (carbon nanometer fiber and carbon nanotube); Ni3Fe alloy particles can be embedded into the carbon nanometer fiber and carbon nanotube uniformly; the Ni3Fe-loaded nitrogen-doped carbon nanometer composite material can be taken as a water electrolysis hydrogen evolution electrocatalytic material, and possesses relatively high activity and excellent stability.

A hydrogen storage tank for a hydrogen fueled aircraft. The tank has a wall made of layers of aerogel sections around a hard shell layer, sealed within a flexible outer layer, and having the air removed to form a vacuum. The periphery of each layer section abuts other sections of that layer, but only overlies the periphery of the sections of other layers at individual points. The wall is characterized by a thermal conductivity that is lower near its gravitational top than its gravitational bottom. The tank has two exit passageways, one being direct, and the other passing through a vapor shield that extends through the wall between two layers of aerogel. A control system controls the relative flow through the two passages to regulate the boil-off rate of the tank.

The invention discloses a preparation process for a high-strength high-conductivity micro copper wire. The preparation process comprises the following steps: S1, adding electrolytic copper into a smelting furnace, preserving heat and melting the electrolytic copper completely to obtain molten copper, introducing an inert gas, adding a composite refining agent, standing and slagging; S2, detecting that the molten copper comprises the following components in percentage by weight: 0.45 to 0.55 percent of Ti, 0.25 to 0.35 percent of Zr, 0.07 to 0.09 percent of Te, 0.07 to 0.09 percent of La, 0.03 to 0.05 percent of Y, 0.15 to 0.25 percent of Sn, less than or equal to 0.05 percent of Mg, and the balance of Cu; S3, enabling a crystallizer of a continuous casting machine to extend into the molten copper, and drawing upwards through a drawing roller mechanism to form an oxygen-free copper rod; S4, extruding the oxygen-free copper rod continuously and drawing repeatedly to obtain the high-strength high-conductivity micro copper wire. According to the copper wire which is prepared by the preparation process, the electric conductivity reaches over 95 percent IACS, and moreover, the tensile strength is also over 480 MPa.

The invention relates to a preparation method of a polyvinylidene-fluoride-base temperature-sensitive resistance material, particularly a preparation method of a polyvinylidene-fluoride-base temperature-sensitive resistance material with negative temperature coefficient effect. The invention aims to solve the problems of high conductive phase filling amount, high room-temperature resistivity and low sensitivity in the existing polymer-base temperature-sensitive material. The preparation method comprises the following steps: (1) preparing graphite oxide from the raw material graphite powder by an improved Hummers process; (2) preparing a graphene oxide N,N-dimethylformamide dispersion solution I; (3) preparing modified graphene (poly(sodium-p-styrenesulfonate)grafted graphene or nanosilver-supported graphene); and (4) preparing the polyvinylidene-fluoride-base composite material using the modified graphene as the conductive filler. The invention is applicable to the field of preparation of polyvinylidene-fluoride-base temperature-sensitive resistance materials.

The invention discloses a polymer matrix composite material with high PTC strength and stability and a preparation method thereof, and the composite material comprises UHMWPE and PVDF, CB and MWNT conductive filling materials which are treated by surface treatment by a titanate coupling agent, and an antioxidant 1010; the preparation method comprises the following steps: performing surface treatment of the CB and MWNT conductive filling materials by the titanate coupling agent, performing vacuum drying of PVDF and UHMWPE with a volume ratio of 1:1, adding PVDF into a torque rheometer, heating and melting for 2 min, adding another matrix of UHMWPE and the antioxidant 1010, wherein the amount of the antioxidant 1010 is 1% of the total mass of the matrix; mixing the mixture of the two matrixes for 10 min, adding the filling materials, mixing at 250 DEG C for 15 min; after melt blending, performing hot pressing with a constant temperature of 250 DEG C and a constant pressure of 18 MPa for 10 min to obtain the sample. The composite material of the invention has good conductivity and low room-temperature conductivity, and has a conductivity of up to 10-1 near a percolation threshold; the conductivity of the composite material can be changed by adjusting the contents of the filling materials in the composite material; the composite material has high PTC strength, good repetition stability, and reduced NTC effect.

The invention relates to a FeCx@NC core-shell structured catalyst and a preparation method therefor. The FeCx@NC core-shell structured catalyst takes iron and FeCx nanoparticle mixture as the core, and takes nitrogen and FeCx-doped carbon as the shell, and has a mesoporous structure with a specific surface area of 500-900m<2>g<-1>. The preparation method for the core-shell structured catalyst comprises the steps of preparing a polyaniline and glucose composite material firstly; performing calcining for one time to prepare a Fe-N-C catalyst; and finally performing calcining for the second time to obtain the FeCx@NC catalyst. The catalyst is high in oxygen reduction activity and high in stability; the raw materials, such as the carbon source and the nitrogen source used by the preparation method are low in cost, so that the production cost for producing a Fe-N-C material by the conventional pyrolysis method can be lowered; meanwhile, the preparation method is simple and easy to implement; and in addition, the core-shell structured catalyst provided by the invention has relatively high electrocatalytic activity, and can be widely applied to the negative electrode catalyst of a proton exchange membrane fuel cell, an alkali negative ion exchange membrane fuel cell, and a metal air battery.

The invention discloses mixed lead paste capable of improving the binding force of a positive grid of a lead-acid storage battery and lead paste and a preparation method of the mixed lead paste. The method comprises the following steps of adding lead powder which is 80-90% of total mass to a paste mixing machine, adding the following raw materials by percentages: 8-10% of sulfuric acid, 0.1-0.3% of stannous sulfate, 0.08-0.10% of conductive fiber, 0.3-0.5% of colloidal graphite, 0.05-0.15% of sodium borate and 1.0-1.2% of antimonic oxide, carrying out dry mixing for 8-10min, adding deionized water, carrying out wet mixing for 2min, adding residual paste and carrying out wet mixing for 8-10min; and dropwise adding the sulfuric acid which is 8-10% of total mass and stirring for 10-12min to obtain the lead paste of which the apparent density is 4.4+/-0.02g/cm<3>. According to the mixed lead paste, the interface problem between an existing battery grid and an active material of the lead paste can be effectively solved, the bonding force between the positive grid and the lead paste is improved, the strength of a polar plate is improved and the cycle life of the battery is prolonged.

Ion Implantation into surfaces of three-dimensional metallic and non-metallic targets is achieved by building a metallic mesh enclosure around the target through rapid-prototyping and then forming an ionized plasma about the target within an enclosing chamber and applying a pulse of high voltage between the wire mesh and the conductive walls of the chamber. The ions from the plasma are driven towards the wire mesh, since the mesh has finite transparency; some of the ions continue to move towards the target and are driven into the target from all sides simultaneously without the need of manipulation of the target object. Repetitive and alternating pulses of high voltages, typically 1 kV or higher, causes the ions to be implanted into the surface of the target. The plasma may be formed of a neutral gas introduced into the evacuated chamber and ionized therein with ionizing radiation so that a constant source of plasma is provided which surrounds the target object during the implantation process. Materials with new surface properties such as increased surface hardness and wear may be generated in this manner. Target object surfaces with sharp features, metals and non-metals can be treated by this technique. This technique would prove helpful in manipulating the surface properties of composites used in building aircrafts, automobiles, ships etc., metallic or non-metallic surfaces with sharp features, and the inner surfaces of tubular objects.

The invention relates to low temperature solidified silver paste for keyboard lines and a preparation method thereof. The silver paste is characterized by comprising the following components by weight percent: 5-20% of silver powder, 25-50% of organic carrier, 6-20% of additives and the balance of silver-coated copper powder. According to the invention the latest developed silver-coated copper powder is utilized to replace part of pure silver powder in the existing low temperature solidified silver paste, so that the microstructure of the silver paste is changed and the silver content is simultaneously reduced, thus changing the electrical conductivity, printing property and connection firmness of the paste, simultaneously reducing the cost and expanding the application range of the silver paste in the keyboard lines; the low temperature solidified silver paste prepared by the method has excellent electrical conductivity, contact property and connection property; and by adjusting the contents of various inorganic components and organic components, the silver paste can adapt to the printed substrates to achieve the effect of ensuring the properties of the product to be excellent, thus ensuring the product quality stability.

The invention provides a liquid metal computer. The computer comprises a logic device which achieves the computer frame structure in a combined mode, and the logic device is a flexible device and mainly comprises liquid metal, flexible thin films and control components; the computer mainly uses the electroconductivity difference of the liquid metal in different physical or chemical states as the states of 0 and 1 of a logic operation, then logic units are constructed through combinations of multiple liquid metal components, and the programming calculation function of the computer is finally achieved; regulating methods of liquid metal conductive states comprise a solid-liquid phase change method, a current regulating oxide film method and a magnetic field environment controlling method. The invention further provides computer construction schemes, wherein the first scheme is that multiple liquid metal components are used for forming basic logic elements; the second scheme is that new circuit construction modes are combined with conventional electronic elements, and the liquid metal is used as connection switches of the electronic elements; the third scheme is that multiple basic elements are combined to construct an analogue computer.

The invention discloses a method for preparing low-cost low-temperature cured conductive paste for screen printing. In the preparation method, base metal nickel (Ni) is used to replace part of used precious metal silver (Ag); nickel powder and silver powder form a conductive function phase of the conductive paste together, wherein the change of the adding proportion of the nickel powder not only can adjust the final electrical property, but also can adjust the printing performance of the paste well; the change of the adding proportion of an organic carrier can adjust the viscosity and the electric conductivity of a product; and the change of the adding proportion of a thickening agent can adjust the viscosity, the leveling property and the printing performance of the product. The quick drying and curing can be performed at a constant temperature of between 120 and 150 DEG C to form the product with good electrical property. The conductive paste of the invention adopts the base metal to replace partial precious metal silver, so the production cost is greatly reduced, and the performance reaches the level of high silver content.

The invention relates to a lead-free thick film nanometer gold electrode slurry which selects nanometer gold powder as a main functional phase, in particular to a thick film nanometer gold electrode slurry and a method for preparing the same. The thick film nanometer gold electrode slurry is characterized by comprising the following components by weight portion: 60 to 90 portions of inorganic part and 40 to 10 portions of organic solvent, wherein the inorganic part comprises the following components by weight portion: 90 to 98 portions of noble metal nanometer gold powder, 2 to 10 portions of lead-free glass powder and 0 to 6 portions of inorganic additive; and the organic solvent comprises the following components by weight portion: 40 to 90 portions of terpineol, 4 to 10 portions of ethyl cellulose, 3 to 30 portions of ethyl caproate, 1 to 6 portions of nitro cellulose, 1 to 25 portions of triethanolamine, and 1 to 6 portions of sodium dodecylsulphonate. The invention changes the microstructure of the gold electrode slurry so as to change the conductivity, the printing performance and the connecting firmness of the slurry, thus the application of the gold electrode slurry to electronic parts and components, in particular high precision electronic parts and components is greatly expanded.

The invention relates to a conductive coating and discloses a conductive coating based on a noble-metal-loaded polymer nanoparticle and a preparation method of the conductive coating. The conductive coating comprises, by mass: 80-120 of an epoxy resin, 10-30 of butyl acetate, 0.5-5 of a silane coupling agent, 20-50 of the noble-metal-loaded polymer nanoparticle, 20-40 of conductive graphite powder, and 35-60 of a curing agent. The preparation method comprises: solving the noble-metal-loaded polymer nanoparticle, the silane coupling agent, the conductive graphite powder, and the curing agent in sequence into butyl acetate; performing stirring for 0.5-1h to obtain an emulsion; adding the epoxy resin into the emulsion under untrasonic oscillation; and performing stirring for 0.5-2h till the mixture is uniform to obtain the conductive coating based on the noble-metal-loaded polymer nanoparticle. According to the invention, the conductive noble metal nanoparticle is loaded on the polymer nanoparticle, so that stability of the metal nanoparticle in a matrix resin is improved, and the metal nanoparticle isn't liable to move. Moreover, the conductivity of the conductive coating can be varied by changing the loading capacity of the noble metal nanoparticle.

The invention discloses a self-checking power distribution cabinet, and solves problems that whether an ion grounding electrode connected with a power distribution cabinet is intact or not cannot be known and the ionization capacity of the ion grounding electrode cannot be improved. According to the technical scheme, the output end of an electric leakage analog circuit is connected with the ion grounding electrode to output analog current; a detection and comparison circuit is used for detecting voltage between the output end of the electric leakage analog circuit and the ion grounding electrode; a control circuit is coupled with the detection and comparison circuit to receive a detection signal and to output the control signal; a warning circuit is coupled with the control circuit to receive a control signal, and to respond the control signal to realize warning; a compensation circuit is coupled with the control circuit, and is controlled by the control circuit to heat the ion grounding electrode. According to the self-checking power distribution cabinet, the ion grounding electrode is detected through real-time detection, if the ion grounding electrode is damaged, an operator is reminded of maintenance through warning; meanwhile, the ionization efficiency of the ion grounding electrode is improved through the compensation circuit.

The invention discloses a preparation method of a nitrogen and phosphorus co-doped foamed carbon nanosheet loaded NiCo nanoparticle composite material, a product and application thereof. The preparation method comprises the following steps: preparing Ni<2+>/Co<2+>/NaCl/EDTMPA/SA mixed hydrogel; and carrying out freeze drying on the Ni<2+>/Co <2+>/NaCl/EDTMPA/SA mixed hydrogel, and carrying out heat treatment in a high-temperature inert atmosphere to obtain the NiCo alloy nanoparticle-loaded nitrogen and phosphorus co-doped highly porous and flexible foamed carbon nanosheet composite material.According to the invention, the product prepared by the method is regular in morphology, NiCo nanoparticles are uniformly loaded in the two-dimensional composite highly-porous flexible foamed carbon nanosheet in size, and the product has the characteristics of multiple active sites, low overpotential, good stability, a two-dimensional composite structure and the like, is an extremely potential water electrolysis electrocatalyst material, and can be used for preparing the alkaline full-water-splitting reaction electrocatalyst.

The invention discloses a chromium bronze alloy material and a preparation method thereof. The chromium bronze alloy material consists of chromium, tin, titanium, 0.006 to 0.012 percent of rare earth and 98.518 to 99.394 percent of copper. The preparation method for the chromium bronze alloy material comprises the manufacturing steps of batching, smelting, casting, extruding, stretching, straightening and finished product inspection and detection. Through the chromium bronze alloy material and the preparation method thereof, the prepared chromium bronze alloy material has good elastic recovery capability and smaller grain size; and because of the adoption of an advanced process method in the process, the quality of the chromium bronze alloy material is greatly improved, and meanwhile the service life of processing equipment is prolonged.

The invention relates to an ammonia gas sensor loaded with platinum particles and a preparation method thereof, and belongs to the field of gas sensors. A gas sensitive material is composed of the platinum particles and a graphene film. The platinum particles are loaded on the graphene film carrier. The method includes the following steps: (1) preparing the graphene film and keeping for later use;(2) using ultraviolet ozone to modify the graphene film obtained in the step (1) and keeping for later use; and (3) impregnating the modified graphene film in the step (2) in a platinum chloride solution, and heating and insulating the graphene film after the impregnation so as to decompose chloroplatinic acid into the platinum particles to obtain the ammonia gas sensitive material loaded with the platinum particles on the graphene film. According to the preparation method, through the ultraviolet ozone treatment, the graphene film is firstly modified by introducing an oxygen-containing functional group, increasing defect sites and adsorption sites of the film, changing resistance characteristics and wettability of the film and loading the platinum particles onto the graphene film. The gas sensitive sensor prepared according to the method has excellent room temperature response performance to ammonia gas.

The invention discloses a directional diagram reconfigurable antenna and a communication device. The directional diagram reconfigurable antenna comprises a substrate, a dipole sub-antenna radiating unit, metal sheets and graphene sheets. The dipole sub-antenna radiating unit is installed on the surface of the substrate. The graphene sheets are installed around the dipole sub-antenna radiating unit. Each metal sheet is installed between two neighboring graphene sheets. In the directional diagram reconfigurable antenna, the chemical potential of two neighboring graphene sheets is controlled by regulating a voltage value applied to two neighboring graphene sheets, so the distribution of the internal electromagnetic field of the metal sheet between two neighboring graphene sheets is changed, thereby the direction of a radiating signal of the dipole sub-antenna radiating unit is controlled, and the directional diagram reconfiguration of the antenna is realized finally. Because the teraherzfrequency band is covered by the working frequency of the graphene, the directional diagram reconfigurable antenna is capable of realizing the signal transmission and reception of a radio frequency terminal of the teraherz frequency band communication system, and improving the communication efficiency.

The invention relates to a method for regeneration treatment of industrial waster water treating water. The method comprises the following steps: firstly, pH valve of industrial waster water treating water entering into an adjusting tank is adjusted to 5 to 7; industrial waster water treating water, pH valve of which is adjusted, enters into a flocculation reactor; aluminium polychlorid, hexadecyl trimethyl ammonium bromide and starch-graft-polyacrylamide are simultaneously added into the flocculation reactor and are stirred for 2 to 10min in the temperature of 15 to 30 DEG C for flocculation decolorization reaction; industrial waster water treating water which is processed by flocculation decolorization reaction enters into an air-flotation separation cell, and then enters into a centrifugal machine for dehydration after a sediment scraper scrape out floc dross floating on the air-flotation separation cell; dehydrated floc dross is dehydrated by a pressure filter to form a filter cake; processed industrial waster water treating water can be used for dissolved-air water of the air-flotation separation cell and industrial water of regenerated water to be recycled. The method causes that COD of processed industrial waster water treating water is less than or equal to 60 Mg/L, chromacity is less than or equal to 30 degrees, thus achieving water quality standard of industrial water of regenerated water.