162 results about "Homogeneous electric field" patented technology

The invention discloses a graphene-containing polyolefin high semi-conductive shielding material for a cable and a preparation method thereof and aims at reducing the volume resistivity of the semi-conductive shielding material. The shielding material disclosed by the invention comprises the following components in percentage by weight: 83%-90% of ethylene-vinyl acetate copolymer, 3%-10% of graphene powder, 3%-6% of white oil, 0.5%-1% of antioxidant and 0.3%-0.6% of zinc stearate. The preparation method disclosed by the invention comprises the steps of mixing, plasticizing, granulating, dehydrating and drying. Compared with the prior art, graphene is uniformly dispersed into the ethylene-vinyl acetate copolymer, so that the volume resistivity is reduced to below 30 omega. cm, a homogeneous electric field is greatly improved, smooth and gapless contact of a conductor, an insulation layer and a metal shielding layer is realized, the effect of shielding the homogeneous electric field of the cable is improved, the electrical performance and the long-term operation reliability of the cable are improved, and the shielding material is suitable for non-metal shielding layers of the cables of above 6kV.

A device for air cleaning from dust and aerosols based on the use of non-homogeneous electrostatic field creating a flow of charged particles (the so called “ionic wind”) and operating as electrostatic precipitator. The device comprises a body inside which corona-forming and precipitation electrodes with opposite polarities are established. Inside the body deflection electrodes are established as well, in front of corona-forming electrodes a reflector for positively charged aeroions by an electrode electrically coupled with said corona-forming electrodes being established. The device comprises one or several tapes made of porous-fiber material placed into non-homogeneous electric field.

Aspects of the invention relate to a device and method for non-contact inactivation of undesirable and/or harmful microorganisms in products using high-voltage nanosecond pulsed electrical field. In certain embodiments, a product may be packaged into a container which is made from a dielectric material and placed between electrodes to be processed by a pulsed electrical field. In certain embodiments, the electrodes, together with the container, may be placed into a treatment assembly filled with a high dielectric permeability media that allows the formation of a quasi-uniform electrical field inside the product and prevents the electrical breakdown of the dielectric material of the container. The electrodes may be connected to a high voltage generator, which forms nanosecond pulses that allow an electrical field of high intensity to penetrate the dielectric material of container walls and gaps between the electrodes and the container's walls to the product without significant energy losses.

The invention relates to a three-dimensional power frequency electric field measurement method and a device capable of correcting the distortion of electric fields. In the method, three pairs of electrode boards of three capacitance type induced voltage sensors are respectively arranged vertical to the direction of a three-dimensional coordinate to form a three-dimensionally-combined capacitance type sensing voltage sensor probe; in a uniform electric field generating device, three induced voltage values and the electric fields corresponding to the three induced voltage values are measured when the directions of applied electric fields are consistent with an X axis, a Y axis and a Z axis; and then the distortion impact factors Lambada are obtained. The device consists of the three-dimensionally-combined capacitance type induced voltage sensor probe and a subsequent signal processing circuit. The method and the device improve the measurement accuracy of the sensors, collect remote measurement data, have the characteristics of small volume and light weight, and is convenient to install and carry; and the measurement accuracy error is about 5 percent. The method and the device are suitable for the measurement of the electric fields nearby transmission lines, transformer substations, high-voltage switch, living quarters and other neighboring areas.

A kind of polymer electrolyte and an other kind of macro molecular polymer electrolyte or non-electrolyte polymer capable of ionizing opposite charge in certain proportion are dissolved in water to prepare dilute solution. The solution is filled into an electrolyzer capable of forming homogeneous electric field and the polymer electrolyte in the water solution is ionized to produce charged polymer ions. Meanwhile, the polymer ions under the action of the electric field immigrate from one electrode to the other to generate density gradient. With the electrolysis and evaporation of the water solution, gradient of polymer mixture components is formed in the electric field direction; and after finishing electrolysis and evaporation, gradient polymer mixture material with continuously changingcomponent is obtained. The method of the present invention is simple and easy to control. By means of controlling voltage, temperature and other conditions, polymer material of different gradient maybe produced.

The invention relates to a semiconductive shielding material for high-voltage direct-current cables, which is prepared from the following raw materials in parts by weight: 80-92 parts of matrix resin, 4-11 parts of ionic liquid modified graphene powder, 1.5-3 parts of crosslinking agent, 0.5-1 part of antioxidant and 0.3-5 parts of lubricant. By adding the 4-11 parts by weight of ionic liquid modified graphene powder into the raw material formula, the semiconductive shielding material for high-voltage direct-current cables can effectively export the current in the semiconductive shielding layer and perform the function of a uniform electric field; and when the temperature of the semiconductive shielding layer achieves to melting point or so, the semiconductive shielding material can effectively inhibit the rearrangement of the graphene powder, prevent the problem of partial discharge or insulation puncture caused by severe electric field centralization of the semiconductive shielding layer due to surface defects, inhibit the space charges in the cable insulation material from accumulation and lower the conductivity.

The invention discloses a pulse impedance particle counting device based on non-uniform electric field and a particle counting method; the pulse impedance particle counting device comprises a glass baseplate, a PDMS (polydimethylsiloxane) microfluidic chip, a signal amplifying element and a signal collection control system; the PDMS microfluidic chip is provided with a microchannel by means of indenting, and the microchannel includes: a main channel with two ends provided with an oil incoming liquid-storing hole and an oil outgoing liquid-storing hole respectively; a sample injection channel extending from the middle of the main channel to a direction leaving the main channel, wherein the tail end of the sample injection channel is provided with a sample injection channel liquid-storing hole; a detection channel extending from a position, a certain distance away from an intersection of the main channel and the sample injection channel, to a direction leaving the main channel, wherein a ratio of the width of the detection channel to the width of the main channel is fixed, and the tail end of the detection channel is provided with a detection channel liquid-storing hole. The pulse impedance particle counting device is simple in structure and high in detection precision, and can provide detection and counting with no need for particles to accessing a detection area.

A method manufactures a single electron transistor device by electro-migration of nanocluster wherein said nanoclusters are metallically passivated and forced to assembly over a lithographic patterned substrate under control of a non homogeneous electric field at room temperature. A controlled migration and the desired location of the metallic passivated nanoclusters are based on a dielectrophoretic process.

A voltage sensor includes an insulator with mutually insulated electrodes embedded therein. The electrodes are coaxial and cylindrical and overlap axially along part of their lengths. They are mutually staggered and control the surfaces of electric equipotential such that there is a substantially homogeneous electric field outside the insulator and a substantially homogeneous but higher field within a sensing cavity within the insulator. A field sensor is arranged within the sensing cavity to locally measure the field. This design allows for the production of compact voltage sensors for high voltage applications.

The invention relates to a partial discharge test system for a cable buffer layer under an extremely uneven electric field. The partial discharge test system is mainly characterized by comprising an alternating-current voltage source, a high-voltage electrode, a grounding electrode, a shielding box and a partial discharge acquisition device; the high-voltage electrode, the grounding electrode andthe to-be-tested sample are installed in the shielding box and used for shielding electromagnetic interference signals. The high-voltage electrode is connected with the high-voltage side of the alternating-current voltage source through the protective resistor, the grounding electrode is connected with the ground wire side of the alternating-current voltage source, a to-be-tested sample is placedbetween the high-voltage electrode and the grounding electrode and is in close contact with the high-voltage electrode and the grounding electrode, and the partial discharge acquisition device is installed between the grounding electrode and the ground wire side of the alternating-current voltage source. According to the invention, the high-voltage electrode, the grounding electrode and the to-be-tested sample are installed in the shielding box, so that external noise signals are effectively shielded, data measurement is carried out more accurately, partial discharge pulse waveforms can be analyzed, different types of discharge sources are distinguished through fuzzy clustering analysis, separation of discharge signals is realized, and the partial discharge test requirement is met.

The invention relates to a method for screening magnetic nanoparticle modified cells based on a photo-induced dielectrophoresis device. By virtue of the photo-induced dielectrophoresis device, the cells, which are modified by virtue of magnetic nanoparticles, are screened out from a mixed solution; a photo-induced dielectrophoresis light path is constructed; light, which is transmitted from a light source, is irradiated onto a chip through the light path; a non-uniform electric field is formed by a solution layer of the chip; and cell screening is implemented on the basis of differences between yeast cells carrying the magnetic nanoparticles and yeast cells. With the application of the method provided by the invention, homogeneous cells can be screened; and the method is relatively short in duration required by a screening process and is higher in accuracy of screening the particles.

The invention relates to deflectable micromechanical systems in which the deflection of at least one deflectable element can be determined, as well as the use thereof. According to the invention, a deflectable element is retained by means of at least one spring element while at least one unit is provided that detects the deflection. Said unit is configured as a piezoresistive sensor comprising at least two contacts which are disposed at a distance from each other in a zone that is deformed during the deflection. The contacts are connected to a voltage source. A non-homogeneous electric field is formed in a downward direction, perpendicular to contact surfaces, such that the electric resistance between contacts, which changes in accordance with the deflection, can be detected as a measure for the position. The zone that is deformed is made of electrically conducting or semiconducting material.

A method for processing graphene-carbon nanotube FET device comprises the following steps of: (1) assembling a graphene sheet on a cutting processing system; (2) setting cutting force, cutting speed and cutting path to the cutting processing system; (3) cutting the graphene sheet into graphene nanobelts; (4) processing a graphene nano-electrode; (5) establishing a stress model of a single-walled carbon nanotube in a non-uniform electric field; (6) titrating the single-walled carbon nanotube solution into the nano gap after the graphene nano-electrode is cut off. The processing method has the advantages of high precision, strong robustness, simple operation, flexibility and low cost. The processed graphene nano-electrode with the nano gap can be used as a probe for the nano point electricalproperty test and the detection of the biological molecules in a micro-environment, has higher sensitivity, and provides a new way for constructing micro-nano electronic equipment with smaller sizesand higher performances.

A non-radioactive plasma ion source device includes at least four planar electrodes that define at least three chambers, including a discharger chamber and at least two additional chambers aligned along a major longitudinal axis of the housing. A discharger ionizes at least one of a transport gas and a discharge gas to form ions in the discharger chamber that are directed by a homogeneous electric field generated by the planar electrodes toward an analyte gas outlet. Ionized species of at least one of the transport gas and the discharge gas that are not entrained by a counterflow gas stream are discharged from the discharger chamber to form a stream of ionized particles that ionize a sample gas and thereby form a stream of ionized analyte particles of the same polarity. The ionized analyte particles are entrained with the stream of ionized particles and pass through an analyte gas outlet to an analyzer.

An electrode structure is proposed for controlling a spatially non-uniform electric field driving a tunable liquid crystal lens or beam steering device. The spatially non-uniform electrode structure enables the generation of a predetermined spatially non-uniform electric field profile where complex capacitive coupling between multiple different electrically floating neighboring electrode segments is employed for the generation of the electrical field of desired form by supplying an initial electric potential to a limited number of electrodes.

The invention provides a cell culture device with shear force-uniform electric field stimulation, which comprises an animal cell culture box, a peristaltic pump, an upstream liquid storage bottle, a downstream liquid storage bottle, a signal generator and a flat-panel flow chamber, wherein the peristaltic pump and the upstream liquid storage bottle are connected with the downstream liquid storage bottle through a silicone tube to form a culture solution perfusion system which is used for loading shear force stimulation for cells; the signal generator is used for providing an electric signal for the flat-panel flow chamber, and the flat-panel flow chamber loads uniform electric field stimulation for the cells through a flat panel electrode-flat panel electrode system; and the flat-panel flow chamber is used for providing a base needed by cell growth and is connected with the culture solution perfusion system and the signal generator to provide a collectively-acted environment of shear force-uniform electric fields for the cells on flat panel electrodes. The cell culture device establishes a cell culture environment under shear force stimulation combined with uniform electric field stimulation, so that the defect that the prior art cannot simulate endothelial cells being in the collectively-acted environment of force-electrical stimulation is overcome, and a foundation of promoting the functional culture of cells and tissues is laid.