164 results about "Electrical resistivity and conductivity" patented technology

A medium-strength and high-conductivity aluminum alloy sheet and its preparation method, which relate to an aluminum alloy sheet and its preparation method. The purpose of the present invention is to solve the technical problem that when other alloying elements are added to existing aluminum alloys to improve the mechanical properties of the alloy, its electrical conductivity will be sacrificed. The medium-strength and high-conductivity aluminum alloy sheet includes the following components by weight percentage: Mg: 0.45-0.53%, Si: 0.4-0.46%, Cu: 0.1-0.5%, Fe≤0.16%, Zn≤0.01%, Mn≤0.03%, Cr≤0.02%, and the balance is impurities and Al. Method: First, prepare an aluminum alloy ingot; second, perform heat treatment; third, perform rolling; fourth, perform solution aging treatment. The electrical conductivity of the medium-strength and high-conductivity aluminum alloy sheet prepared by the present invention is above 53% IACS, while the hardness is higher than 75 HV and the tensile strength is higher than 187 MPa. The present invention can obtain a medium-strength and high-conductivity aluminum alloy sheet.

Method and systems are provided that characterize a geological formation, which involve collecting or obtaining electrical signal data that results from interaction of electrical signals with the formation. The electrical signal data is processed to determine data characterizing relative permittivity and conductivity of the formation. The data characterizing relative permittivity and conductivity of the formation are used as inputs to models to determine data characterizing water saturation of the formation, particularly useful in formation evaluation and reservoir saturation dynamic monitoring in fresh water and mixed salinity environments.

The invention provides a composite positive electrode material and a preparation method and application thereof, the composite positive electrode material comprises a matrix and a carbon coating layer on the surface of the matrix, and the matrix comprises a porous LMFP material; the porous LMFP material comprises doped metal elements, and holes of the porous LMFP material comprise a lithium supplement agent. Doping elements in the composite positive electrode material can improve the stability of a crystal structure and reduce high-temperature storage and cyclic gas production, and the lithium supplement agent in the porous LMFP material can prolong the cycle life of the material and can be decomposed to form pores again after first-time charging, so that an electrolyte can enter the interior of material particles, and the service life of the material is prolonged. And the carbon coating layer can improve the conductivity of the material and reduce the polarization impedance of the material, and meanwhile, the processing problems that residual alkali on the surface of the lithium supplementing agent reacts with a glue solution, so that slurry is gelled and the like can be avoided.

The utility model provides an antenna and electronic equipment, and the antenna comprises a resonant ring which comprises an annular base part with a first opening; and the first periodic structure and the second periodic structure are both located in a space defined by the annular base part and are both connected with the resonant ring. Through the arrangement, a metamaterial structure is formed, the electrical performance of the antenna can be improved, the physical characteristics such as negative magnetic conductivity and negative electrical conductivity can be realized, the performance of the antenna can be improved, and the wiring area and the occupied space of the antenna can be reduced.

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 high performance die castable aluminum alloy is described, wherein the aluminum alloy is characterized as having a high yield strength and high conductivity compared to conventional aluminum alloys, and also a high flowability and low susceptibility to hot tearing when die cast. The aluminum alloy may contain 4-6 wt. % nickel, a yield strength of at least about 90 MPa, and an electrical conductivity of at least about 48% IACS.

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.

This invention discloses a method for calculating the conductivity of a supercritical fluid system taking into account the quartz dissolution effect, belonging to the technical field of calculating the conductivity of solutions in supercritical fluid systems. This invention establishes a fluid conductivity model in a ternary system under the conditions of a temperature of 500-800°C, a pressure of 6-12 kbar, and a NaCl concentration of 0.01-0.4X NaCl. By introducing a quartz solubility correlation equation and combining it with an ion activity coefficient model, this method quantifies the nonlinear evolution of supercritical fluid conductivity at a microscopic level, thus addressing the problems existing in the prior art.

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.

The present invention provides a method and system for detecting the compaction degree of construction leveling, which is applied to the field of measurement data processing. Based on the preset electromagnetic induction sensor of the roller, the present invention can detect the compaction degree during the construction process in real time, solving the problem that the traditional method relies on spot checks after the construction is completed and cannot adjust the construction parameters in time. By collecting electromagnetic parameters (such as conductivity, permittivity, permeability) and matching them with the compaction state of the construction ground, the soil compaction situation can be evaluated in real time. When it is found that the compaction is insufficient, the additional rolling times are automatically calculated, and the operation parameters of the roller are dynamically adjusted according to the compaction distribution heat map. This process not only improves the construction accuracy and efficiency, but also can avoid the situation of over-compaction or under-compaction, reducing rework and resource waste, providing real-time data feedback and automatic adjustment functions, realizing the intelligent management of the construction process, thereby greatly improving the construction quality and resource utilization rate.

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.

To provide a composite material having high thermal conductivity and low electrical conductivity. [Solution] The composite material comprises dispersed materials with a thermal conductivity of 100 W / K·m or more and an insulator interposed between the dispersed materials. For example, the dispersed materials are aluminum-based metal powders. For example, the insulator is an oxide or resin whose glass transition point is equal to or lower than the melting point of the dispersed materials. For example, the electrical conductivity of the composite material is 0.5×10 6 S / m or less.

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 utility model relates to the technical field of current collectors, in particular to a composite current collector with high conductivity, which comprises a polymer base material layer and metal foil layers positioned on the upper and lower surfaces of the polymer base material layer, blind holes are formed in two side surfaces of the polymer base material layer, and the two side surfaces of the polymer base material layer are filled with metal. The problem of low conductivity of a composite current collector structure in the prior art is solved, and the conductivity and bonding strength of the composite structure are improved by filling the blind holes in the surface of the polymer substrate with the metal.

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.

The present invention discloses a high electrical conductivity and high mobility n-type diamond film and a preparation method thereof. In this method, tantalum atoms entering the film during chemical vapor deposition are doped at the nanoscale interface. This doping method is different from the traditional lattice substitution doping, which well solves the problem of n-type doping in diamond and also provides a new way to solve the doping problems of other wide-bandgap materials.

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.