16 results about "Electrical resistivity and conductivity" patented technology

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.

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.

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.

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.

This invention relates to the field of cable inspection technology, and proposes a method and system for inspecting cable lead-sealed structures. The method involves applying an excitation signal to a sensor array deployed on the lead-sealed structure of the cable to be inspected, acquiring the differential induced signal generated by the cable lead-sealed structure under the excitation magnetic field, preprocessing it, and constructing an image of the conductivity distribution of the lead-sealed structure cross-section for defect location, quantitative identification, and condition assessment. Based on magnetic induction tomography, the internal conductivity characteristics of the cable lead-sealed structure are visualized, thereby completing defect location, quantitative identification, and overall condition assessment. Furthermore, the sensor array is configured as multiple differential coil units, with symmetrical anti-phase series induction coils on both sides of the excitation coil of each differential coil unit, effectively suppressing environmental common-mode interference and retaining only useful signals from defects, thus improving the ability to identify weak defect signals. This effectively improves the accuracy, reliability, and early warning capability of cable lead-sealed structure inspection.

A device for measuring electrical conductivity comprising: electrodes (700a, 700b); a current source (100) configured to inject an electrical current into a medium (600); a switching block (200) configured to produce a current flow through the medium (600) from the first electrode (700a) to the second electrode (700b) or from the second electrode (700b) to the first electrode (700a); a sensor block (300) connected to the first electrode (700a) and / or the second electrode (700b), configured to amplify an electrical magnitude of the medium (600) generated in response to the current flow in the medium (600); and a feedback block (400) configured to connect the sensor block (300) to the current source (100).

The invention belongs to the technical field of ocean geophysical exploration, and particularly relates to a deep sea hydrothermal sulfide detection method and system based on a frequency domain electromagnetic method, and the method comprises the steps: driving a transmitting coil to excite a medium to generate a secondary electromagnetic response; at multiple different depths in the drill hole, electromagnetic response signals are collected through an electromagnetic receiving sensing system, and magnetic induction intensity-depth data are formed; a consistent inversion depth division mode is adopted, one-dimensional electrical inversion is carried out respectively, and a conductivity model of dielectric electrical parameters changing along with depth under each emission frequency and mutually registered in space is obtained; based on the conductivity corresponding to each measurement depth, obtaining a polarizability parameter representing the polarization characteristic of the medium, and generating a polarizability profile curve in which the polarizability changes along with the depth; comprehensively judging the occurrence position of the sulfide ore body according to the abnormal threshold value and the conductivity characteristic in the polarizability profile curve, and accurately describing the boundary depth and thickness information of the ore body.

A winding frame holds the AC magnetic field applying coil. The first skin thickness is determined by the frequency of a third harmonic wave of the AC magnetic field excited by the AC magnetic field applying coil and an electrical conductivity and a magnetic permeability of the winding frame. The second skin thickness is determined by the frequency of a fundamental wave of the AC magnetic field excited by the AC magnetic field applying coil and the electrical conductivity and the magnetic permeability of the winding frame.

This invention provides a Co@CA microwave absorbing material, its preparation method, and its application. The preparation method of the Co@CA microwave absorbing material is as follows: 1) After simple precipitation of Co salt and dimethylimidazole in methanol solution, the material is washed, dried, and ground to obtain MOF:ZIF-67 powder; 2) Resorcinol is dissolved in Na2CO3 aqueous solution, formaldehyde solution is added, and the resulting transparent solution is injected into a mold, sealed, and heated to solidify. Then, MOF:ZIF-67 powder is added, and the mixture is stirred thoroughly with a spatula. After solidification, the mixture is freeze-dried; 3) Finally, the material is calcined at high temperature under a nitrogen atmosphere to complete the preparation. This invention applies functional building blocks and spatial order to the design of microwave absorbing materials. Using metal / carbon as functional building blocks, the ordered construction of magnetic metal particles on carbon aerogel enhances its electromagnetic wave absorption performance, ultimately achieving the requirements of "wide, light, thin, and strong". The preparation process is simple and inexpensive, enabling large-scale mass production. The obtained microwave absorbing material has suitable electrical conductivity and excellent electromagnetic wave absorption intensity.

The application provides a kind of GIL loss fast calculation method considering electromagnetic space distribution, relate to high voltage gas insulated transmission technology field, solve the problem that existing GIL loss calculation method is difficult to consider physical rigor and calculation efficiency.The method, the coaxial hollow cylindrical structure electromagnetic field model of GIL is established, and then the diffusion equation of time-harmonic electromagnetic field is constructed and the boundary condition is set;Solving time adopts the linear combination of first kind Bessel function and second kind Bessel function as the general solution form, determines the undetermined coefficient, obtains the magnetic field intensity and electric field intensity distribution expression in the conductor region and shell region;Finally, based on the Poynting theorem, the analytical expression of unit length conductor ohmic loss and shell eddy current loss is calculated and derived, and the conductivity parameter is embedded in the form of explicit function of temperature, that is, the GIL loss calculation is completed.The calculation realized by the application can provide a clear, differentiable and traceable heat source coupling interface for the heat network model.

This invention provides a conductive sealing and continuity status indication structure for anti-electromagnetic interference of unmanned aerial vehicles (UAVs). The structure includes a gradient conductive sealing layer, a contact resistance sensing unit, an intelligent status assessment module, and a multi-level early warning indication system. The gradient conductive sealing layer consists of an outer layer of elastic conductive adhesive, a middle layer of highly conductive metal mesh, and an inner layer of interface reinforcing adhesive, achieving an optimized balance between mechanical flexibility and electrical conductivity. The sensing network employs a four-wire micro-ohm measurement principle, with multiple measurement nodes distributed along the joint to collect the contact resistance values ​​of each section in real time. The control unit performs data fusion processing and trend analysis, triggering corresponding early warning indications based on preset graded thresholds. This invention solves the problem of existing technologies being unable to monitor the continuity status of joints in real time, significantly improving the reliability and maintainability of UAV electromagnetic shielding.

A measuring arrangement for determining the electrical conductivity of a measuring fluid comprises a gradiometer including an excitation coil and a first and a second receiver coil. The first and second receiver coils and the measuring fluid are inductively coupled to the excitation coil. The measuring arrangement includes a measuring circuit for exciting the excitation coil, for detecting an electrical signal from the receiver coils, and for deriving the electrical conductivity of the measuring fluid from the signal. All coils consist of a conductive material that has a resistance temperature coefficient which at 20° C. is less than 3.93*10−3 K−1.

The application provides a non-Hermite super surface and a construction method thereof, the non-Hermite super surface comprising a composite layer and a complementary layer coupled with the composite layer, a medium layer being arranged between the composite layer and the complementary layer; the composite layer is hollowed out to be provided with a plurality of hollow cylinders; the complementary layer is hollow at positions corresponding to solid portions of the plurality of hollow cylinders. By adjusting the structural parameters and selecting the material types, the composite layer and the complementary layer are coupled, so that the device realizes the influence on the reflection of the incident electromagnetic wave in the microwave band, and by changing the conductivity of the cited vanadium dioxide in the composite layer, the non-Hermite super surface appears singular points at two different frequency points, realizes the regulation and control of the non-Hermite super surface, effectively widens the application range of the non-Hermite super surface, and is more conducive to realizing the functionalization, device integration and application of the non-Hermite super surface.

This invention belongs to the field of RGO aerogel technology, specifically disclosing a method for preparing RGO aerogel through hydrothermal synthesis and freeze-drying. This method uses GO sheets, SiC whiskers, and ZIF-67 particles as basic building blocks to prepare RGO aerogel. Using hydrothermal synthesis and freeze-drying techniques, with SiC whiskers as a secondary support network, a graphene composite aerogel with synergistic regulation of N-doped and functional components is constructed. The addition of ammonia and ZIF-67 particles reduces the material's electrical conductivity, thereby effectively regulating the dielectric constant. Simultaneously, the secondary nitrogen doping induced by these two components and the generation or retention of oxygen- and nitrogen-containing polar structures increase the relative content of polar groups and construct multiple heterogeneous interfaces, significantly enhancing polarization loss and enriching the loss mechanism. The RGO-0.10 aerogel prepared by this invention exhibits excellent EMW absorption performance. Furthermore, its highly porous microstructure gives the material a thermal conductivity of 0.03930 W / (m·K), demonstrating good thermal insulation performance.

The application discloses a method for analyzing characteristics of sea wave noise in layered seawater with conductivity, and belongs to the technical field of sea wave noise analysis. The method is used for solving the problem that the existing calculation of sea wave induced electromagnetic field often assumes that the seawater conductivity is uniformly distributed, and the marine environmental electromagnetic noise cannot be accurately analyzed. The method comprises the following steps: S1, a calculation model of sea wave induced electromagnetic field based on layered seawater with limited depth and conductivity is established; S2, the sea wave induced electromagnetic field is solved by using Maxwell differential equation and seawater wave equation conditions; S3, noise generated by sea wave motion cutting geomagnetic field is analyzed according to the solved sea wave induced electromagnetic field, and the spatial distribution of unit amplitude sea wave magnetic noise and electric noise is derived; and S4, sea wave electromagnetic noise power spectrum under different sea conditions is analyzed in combination with sea wave spectrum. The application considers the characteristic of uneven seawater conductivity, establishes a four-layer medium sea wave induced electromagnetic field calculation model, and analyzes the sea wave electromagnetic noise.