109 results about "Electrical resistivity and conductivity" patented technology

The invention provides a force thermal electric field coupling method based on an inclined crown spring connector, and belongs to the field of electric connector design and optimization analysis, and the method specifically comprises the following steps: S1, building a single-terminal parameterization CAE model of an inclined crown spring large-current connector, material attribute setting, grid division, contact pair definition, boundary condition and solver configuration are completed through an APDL language; s2, executing transient mechanical field simulation, and extracting normal contact force, geometric deformation and contact area of each contact at the moment when the pin is completely inserted; s3, based on the Hertz contact theory, calculating a contact resistance theoretical value according to the normal contact force of each contact, and deducing the contact conductivity and the contact heat conductivity; and S4, reconstructing a reed geometric model according to a mechanical field deformation result, and fitting the shape of the contact into an ellipse or a circle according to the contact area. The method is used for solving the problem that coupling simulation convergence is difficult due to a complex structure, and the multi-physics field coupling calculation difficulty is reduced.

A milk-flow rate (Q) of a fluid comprising milk or a mixture of milk and gas through a conduit (165) is determined by a sensor device (140) with a measurement chamber (160) comprising a reference electrode pair (170) and first and second measurement electrode pairs (110, 120) that determine at least one electrical characteristic of the fluid(RD). Based thereon, a processing device (150) derives a conductivity (σ) and / or an impedance (Z) value of the fluid that passes through the measurement chamber (160) at each of the first and second measurement electrode pairs (110, 120). Based thereon, in turn, the processing device (150) repeatedly derives a milk-filling factor (FF) in measurement chamber (160) and a speed (v) of the fluid that passes through the measurement chamber (160) by comparing the conductivity (σ) and / or the impedance (Z) value of the fluid at each of the first and second measurement electrode pairs with the conductivity (σ) and / or the impedance (Z) value of the milk of the fluid at the reference electrode pair (170) and mapping a first series of values against a second series of values in a set of temporal windows. The first series of values comprises the values of the first test parameter in the set of temporal windows and the second series of values comprises the values of the second test parameter in the set of temporal windows. A trained neural network (180) repeatedly determines the milk-flow rate (Q) based on the milk-filling factor (FF) in the measurement chamber (160) and the speed of (v) the fluid that passes through the measurement chamber (160).

A conductive hydrogel fiber including a hydrogel network formed from a water-soluble hydrogel polymer and conductive fillers dispersed therein is provided. The hydrogel network includes a porous structure having nanofibrillar network walls, the surfaces of which are provided with interconnected crystallized nanofibrils formed by concentration and aggregation of the hydrogel polymer. The conductive hydrogel fiber exhibits high electrical conductivity, excellent tensile strength, large elongation at break, high toughness, and low swelling in water.

The invention relates to an in-hole transient electromagnetic response characteristic numerical simulation method based on a tunnel three-dimensional geoelectric model and an absorption boundary finite element method, and belongs to the technical field of geophysical exploration. The method comprises the following steps: constructing a tunnel full-space three-dimensional conductivity model; based on a Maxwell equation set, a vector potential and a scalar potential are introduced, a vector control equation of a transient electromagnetic field is derived in combination with Coulomb specifications, first-order absorption boundary conditions are established, and a weak form finite element equation is derived through a Galerkin weighted margin method; generating a global sparse matrix by utilizing spatial discretization and unstructured grid division, and performing iterative solution on the dynamic electromagnetic field by adopting a Newmark time discretization method; and simulating the transient electromagnetic response of geological anomalous bodies with different resistivity and the distance between the geological anomalous bodies and the receiving coil, and analyzing the attenuation characteristic and the geometric gravity center effect to obtain an electromagnetic response rule. The device can accurately simulate the electromagnetic response of abnormal bodies such as aquifers and faults in front of a tunnel face and around drill holes.

The present invention relates to an electrode for use in an energy storage device, the electrode comprising an electron collector, an active material and an electrically conductive binder wherein the electrically conductive binder comprises a solution treated n-type electrically conductive polymer having an electrical conductivity of at least 100 S / cm.

The invention relates to the technical field of chemical production, and provides a method for evaluating the surface electrical property of titanium dioxide powder, which comprises the following steps: grinding and thermally treating titanium dioxide powder particles to obtain titanium dioxide powder with a standardized surface state; preparing a monovalent electrolyte solution, and measuring the basic conductivity sigma0 of the monovalent electrolyte solution at a preset temperature; preparing turbid liquid based on the electrolyte solution and the titanium dioxide powder with the standardized surface state, carrying out solid-liquid separation on the turbid liquid after dispersion treatment, and collecting clarified liquid; measuring the conductivity sigma1 of the clarified liquid at a preset temperature; calculating an equivalent parameter A = [k (sigma0-sigma1)] / c; the unit of sigma0 and sigma1 is mS / cm, c is the mass concentration of the turbid liquid, the unit is g / L, k is a coefficient of 100-1000 and is dimensionless, and the absolute value of the equivalent parameter A is used for quantitatively representing the surface electrical property of the titanium dioxide powder particles and is dimensionless. According to the scheme, direct and quantitative characterization of the intrinsic surface electrical property of the powder is realized.

The application belongs to the field of metallurgy, and provides a copper alloy and a preparation method thereof.The copper alloy comprises a copper matrix and high-entropy alloy nano precipitated phases distributed in the copper matrix, and the high-entropy alloy nano precipitated phases comprise iron elements, cobalt elements, nickel elements and chromium elements.The application introduces high-entropy alloys as nano precipitated phases into the copper matrix, and the obtained copper alloy simultaneously has high electrical conductivity and thermal conductivity, and strength and ductility.

A circuit board 1A has the following features: an insulating layer 10 with a first main surface 10a and a second main surface 10b facing each other in the thickness direction; a first intermediate layer interconnect 31 and a second intermediate layer interconnect 32, which are provided to extend in the thickness direction through the same insulating layer 10 or different insulating layers 10; a first conductor layer 21, which is provided at the first main surface 10a of the insulating layer 10 and is connected to the first intermediate layer interconnect 31; a second conductor layer 22, which is provided at the second main surface 10b of the insulating layer 10 and is connected to the first intermediate layer interconnect 31; a third conductor layer 23, which is provided at the first main surface 10a of the insulating layer 10 and is connected to the second intermediate layer interconnect 32; andA fourth conductor layer 24 is provided on the second main surface 10b of the insulating layer 10 and is connected to the second interlayer connecting conductor 32. The first interlayer connecting conductor 31 comprises, in the thickness direction, a first part 31A and a second part 31B with a lower electrical conductivity than the first part 31A. One end part of the first part 31A is attached to the first conductor layer 21, and another end part of the first part 31A is attached to an end part of the second part 31B. Another end part of the second part 31B is attached to the second conductor layer 22. The second interlayer connecting conductor 32 comprises, in the thickness direction, a third part 32A and a fourth part 32B with a lower electrical conductivity than the third part 32A. One end part of the third part 32A is attached to the third conductor layer 21 and another end part of the third part 32A is attached to an end part of the fourthPart 32B is attached. Another end part of the fourth part 32B is attached to the fourth conductor layer 24. The relationships T1 < T2 and B1 / A1 > B2 / A2 are satisfied, where A1 is the height of the first part 31A, B1 is the height of the second part 31B, A2 is the height of the third part 32A, B2 is the height of the fourth part 32B, T1 is the height of the first interlayer connecting conductor 31, and T2 is the height of the second interlayer connecting conductor 32.

This invention discloses a method for improving the toughness of annealed conjugated polymer films. The method includes: mixing a nucleating agent with a conjugated polymer, forming a film, and then annealing it to obtain a modified conjugated polymer film. This invention accelerates the crystallization of the conjugated polymer by adding a nucleating agent, effectively increasing the number of connecting molecules between crystalline regions within the film. The annealed film exhibits higher electrical conductivity and better toughness, even approaching the tensile properties of unmodified conjugated polymer films, thus solving the problem of good electrical properties but poor toughness in annealed conjugated polymer films.

Provided is an alumina powder which has an α-phase content of 95% or more and has a 100% cumulative particle diameter (D100) of 1-20 µm in a volume-based particle size distribution, wherein: the carbon content of the alumina powder is 0.01-2 mass%; and the electrical conductivity of a dispersion that contains 10 parts by mass of the alumina powder, 20 parts by mass of ethanol, and 70 parts by mass of ion exchanged water is 20 µS / cm or less at 25°C. The alumina powder is produced by subjecting the surfaces of alumina particles to an acid treatment and subsequently coating the surfaces with a silane coupling agent. As a result, the present invention provides: a sealant which has excellent fluidity and excellent thermal conductivity; and an alumina powder which is used for the sealant.

The invention provides a preparation method of a copper-titanium alloy, which comprises the following steps: S1, mixing copper particles and TiH2 powder according to the composition proportion of the copper-titanium alloy, and forming the TiH2 powder on the surfaces of the copper particles to obtain composite copper particles; s2, the composite copper particles are placed in a crucible, and a directional solidification furnace is vacuumized and then filled with carbon-containing reducing gas; and S3, the crucible in the step S2 is heated so that the composite copper particles can reach the melting temperature, then the crucible is immersed into a cooling medium to be subjected to directional solidification cooling, and the copper-titanium alloy is obtained. The invention further provides the copper-titanium alloy prepared through the preparation method. According to the preparation method provided by the invention, TiH2 micro powder is uniformly adhered to the surfaces of copper particles in a mixing manner, and then directional solidification and cooling of the composite copper particles are carried out under micro-negative-pressure reducing gas; the copper-titanium alloy obtained by the process weakens the negative influence of titanium on the conductivity of copper, so that the copper-titanium alloy has the advantages of strength and conductivity.

A curable prepreg comprising a structural layer of unidirectional electrically conductive fibres having interstices therebetween, having a first outer face and an essentially parallel second outer face, and comprising thermosetting resin impregnated within the structural layer and present within the interstices, and a first layer of thermosetting resin in contact with the first outer face of the structural layer, wherein the ratio of the electrical conductivity in the x-direction, parallel to the conductive fibres, to the electrical conductivity in the y-direction perpendicular to the conductive fibres, is less than 1000.

The present invention provides a method for treating water that can decompose organic fluorine compounds contained in the water to be treated. [Solution] A method for treating water to be treated, comprising a decomposition step of passing an electric current through water to be treated W1a containing an organofluorine compound and an electrolyte, and having an electrical conductivity of 6.0 mS / cm or higher, to decompose the organofluorine compound in the water to be treated W1a. The treatment method can be used to decompose organofluorine compounds in contaminated water W1A that is contaminated with organofluorine compounds such as perfluorooctanesulfonic acid and perfluorooctanoic acid.

A method for measuring phase transition temperature using electrical conductivity, comprising: preparing a graph of change in conductivity of molten salts according to temperature, and performing at l

The application discloses a physical neural network-based electrical property tomography method, which spatially obtains permittivity and conductivity of all points through four steps.The application does not need to simplify the core equation of MR-EPT to solve, and does not need to use a numerical method to solve by discretizing the derivative of the dielectric property in space, thereby avoiding the discretization error, so that the application has higher precision in obtaining the permittivity and the conductivity.The physical neural network-based electrical property tomography method uses a neural network to construct a mapping relationship between a transmit field and its spatial derivative and electrical properties, so that the precision of the obtained result is higher.

The invention discloses a superconducting magnet inner joint structure suitable for a star simulator and a use method thereof, and relates to the technical field of superconducting cables, the structure comprises a shell, at least two superconducting conductors and a crimping assembly, a protection chamber is formed in the shell, and two ends of the shell are provided with sealing ports. A metal stable layer at a connecting end, extending into a protection cavity, of a superconducting conductor is removed to form an exposed superconducting layer window, and then pressure is applied to the connecting end through a crimping assembly arranged on a shell, so that superconducting layers in the superconducting layer windows of different superconducting conductors are in direct physical contact in the protection cavity and form electric connection; the metal stable layer at the connecting end is removed, so that the current does not need to be transmitted through the metal stable layer with high conductivity, but is directly conducted through the superconducting layer in the superconducting layer window, the generation of Joule heat is avoided, and the advantage of low loss of the superconducting material is fully exerted.

This invention proposes a multi-frequency electromagnetic feature fusion method for abrasive particle identification, involving signal processing, sensor information fusion, and intelligent monitoring of mechanical conditions. It solves the problems of measurement distortion caused by hardware parasitic parameter coupling, the inability to directly solve the highly nonlinear time-harmonic field model analytically, and the poor convergence of conventional optimization algorithms leading to misjudgment of abrasive particle parameters in existing abrasive particle identification methods. This invention constructs a forward analytical model of the time-harmonic field and a nonlinear objective function, and utilizes the Levenberg-Marquardt (LM) optimization algorithm to jointly invert and extract the equivalent diameter, conductivity, and relative permeability of unknown metallic abrasive particles in a multi-dimensional parameter space. This invention can accurately decouple the equivalent diameter, conductivity, and permeability of abrasive particles, accurately distinguish materials, and the LM algorithm converges quickly and does not diverge, achieving millisecond-level inversion, meeting the high precision and real-time requirements of online monitoring of industrial oil.

Polymer composite with an electrical volume conductivity between 10 -7 S / cm and 1 S / cm, consisting of or containing • a preferably thermoplastic polymer, • Carbon fibers and • Carbon nanostructures.

A heat transfer fluid or thermal management system fluid comprising a freezing point depressant, water having an electrical conductivity of less than 5 μS / cm, and one or more electrically non-conductive, low-electrical-conductivity corrosion inhibitors, or a corrosion inhibitor composition comprising one or more organic acids and one or more organic bases, wherein the electrical conductivity of the heat transfer fluid is about 500 μS / cm or less.

A fiber-reinforced composite material including reinforcing fiber layers and a resin layer sandwiched therebetween, wherein conductive particles having a sphericity of 85% or more are disposed in the resin layer, and the fiber-reinforced composite material has a portion where upper and lower reinforcing fiber layers are connected by one conductive particle and has a portion where a conductive particle is sunk in a reinforcing fiber layer. Provided is a fiber-reinforced composite material having sufficient electrical conductivity in a thickness direction with a small addition amount of conductive particles.

The invention relates to an arc channel impedance determination method and device, equipment, a storage medium and a product. The method comprises the following steps: acquiring the conductivity of each observation point in different observation areas in a target arc and the conductivity change rate of each observation area; for any observation area, determining an impedance value corresponding to the observation area according to a size relationship between the conductivity change rate corresponding to the observation area and a target change rate threshold value and the conductivity corresponding to each observation point in the observation area; and determining the channel impedance corresponding to the target arc according to the impedance values corresponding to different observation areas in the target arc. By adopting the method, the determination efficiency of the arc channel impedance can be improved on the premise of ensuring the determination accuracy of the arc channel impedance.

The invention discloses a high-strength copper alloy material for a rotor slot wedge of a large generator and a preparation method of the high-strength copper alloy material. The alloy material comprises 1.8-2.5% of Ni, 0.5-0.8% of Si, 0.05-0.3% of Cr, 0-0.25% of Zr and the balance Cu. The preparation method comprises the steps that S1, vacuum induction melting is conducted; s2, homogenizing annealing is carried out; s3, hot working; s4, solution treatment; s5, cold machining; and S6, aging treatment. By controlling the nickel-silicon ratio, a sufficient and stable Ni2Si strengthening phase is formed, the Zr content is increased, the high-temperature softening resistance is remarkably improved, the tensile strength of the material is not lower than 650 MPa, the conductivity is not lower than 30% IACS, it is ensured that the high strength can still be kept after long-term thermal exposure at the temperature of 400-450 DEG C, and the stress relaxation resistance is superior to that of a traditional Cu-Cr-Zr alloy.

This electromagnetic wave absorbing member for a sub-terahertz band is characterized by comprising a polymer material and carbon nanotubes, the carbon nanotubes including single-walled carbon nanotubes as a main component, the electrical conductivity of the electromagnetic wave absorbing member being 0.1 (S / cm) to 2.0 (S / cm), and the attenuation rate at a frequency of 300 (GHz) being 5 (dB) or more.

The application provides a force-thermal-electric field coupling method based on an inclined crown spring connector, and belongs to the field of electric connector design and optimization analysis, and the method specifically comprises the following steps: S1: a single-terminal parameterized CAE model of the inclined crown spring high-current connector is established, material attribute setting, mesh division, contact pair definition, boundary condition and solver configuration are completed through an APDL language; S2: a transient mechanical field simulation is performed, and normal contact force, geometric deformation and contact area of each contact point at the moment when the pin is completely inserted are extracted; S3: based on the Hertz contact theory, the theoretical value of the contact resistance is calculated according to the normal contact force of each contact point, and the contact conductivity and the contact thermal conductivity are derived; S4: according to the deformation result of the mechanical field, the spring sheet geometric model is reconstructed, and the contact point shape is fitted into an ellipse or a circle according to the contact area. The application is used to solve the convergence difficulty problem of the coupling simulation caused by the complex structure and reduce the difficulty of the multi-physical field coupling calculation.

The invention relates to a resistor (1), in particular a snubber shunt (1) for damping voltage spikes, with a resistive element (9) made of a resistive material, wherein the resistive element (9) has a meandering shape with at least one deflection region (12) with a deflection of the current flow direction. The invention provides that the resistive element (9) in the deflection region (12) consists at least partially of a conductor material (e.g., copper) that has a higher specific electrical conductivity than the resistive material, so that the current-carrying cross-section of the resistive element (9) in the deflection region (12) consists at least partially of the conductor material.

1. The name of the design product: multi-parameter measuring instrument. 2. The use of the design product: for measuring and analyzing pH, conductivity, dissolved oxygen and other parameters. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The invention discloses a method for improving the conductivity of a K-based hydroboron solid electrolyte, and the method comprises the following steps: analyzing the structure of the K-based hydroboron solid electrolyte synthesized by an experiment into a cif format; geometric optimization calculation is carried out on the obtained structure, and detailed structural feature observation is carried out in VESTA software; a migration path possibly existing in the K-based hydroboron solid electrolyte is observed through Crystal Explorer software; in combination with an observed result, removing a K ion in the body under the condition of no external strain so as to manufacture a K vacancy and carry out K ion migration calculation; under the condition of external strain, detecting whether the material is stable or not through molecular dynamics simulation, and if the material is stable, calculating the size of an energy barrier required by K ion migration under the external strain; by comparing the sizes of energy barriers required by K ion migration under different strains, the tensile strain can reduce the K ion migration energy barriers and promote K ion migration, so that the conductivity of the solid electrolyte material is improved.

The application belongs to the technical field of electromagnetic prospecting and numerical simulation, and provides a three-dimensional forward simulation method and system for anisotropic medium of electromagnetic method with ultra-wide frequency band, which is based on the vector finite element method, discretizes the electric field equation of unified traditional current and displacement current, fully considers the influence of arbitrary anisotropic conductivity, arbitrary anisotropic dielectric constant and magnetic conductivity, and provides a basis for the theoretical research, field survey and data inversion of the electromagnetic method with ultra-wide frequency band.

The present application relates to the technical field of medical devices, and particularly relates to a plating device and method for flexible electrodes, which comprises: a first inner groove, a bottom plate of the bottom of which is provided with a plurality of through holes; the first inner groove is filled with liquid metal, a cathode panel is placed in the liquid metal and connected to a negative electrode; a second inner groove is located below the first inner groove, and is internally filled with plating solution, an anode panel is placed in the plating solution and connected to a positive electrode; an electrode to be plated passes through the through holes, and has a part to be plated at the lower end, the part to be plated is immersed in the plating solution and connected to the plating solution and the anode panel, and the upper end of the electrode to be plated is immersed in the liquid metal and connected to the cathode panel through the liquid metal. The beneficial effect is that the first inner groove filled with liquid metal and the second inner groove filled with plating solution are used in combination, so that the flexible electrode can be selectively partially plated, the uniformity of the electrical conductivity of the small flexible electrode is improved when no auxiliary common connection electrode is made, and the electrical conductivity of the electrode is uniformly controllable.