174 results about "Homogeneous electric field" patented technology

An apparatus is provided for selectively destroying dividing cells in living tissue formed of dividing cells and non-dividing cells. The dividing cells contain polarizable intracellular members and during late anaphase or telophase, the dividing cells are connected to one another by a cleavage furrow. The apparatus includes insulated electrodes to be coupled to a generator for subjecting the living tissue to electric field conditions sufficient to cause movement of the polarizable intracellular members toward the cleavage furrow in response to a non-homogeneous electric field being induced in the dividing cells. The movement of the polarizable intracellular intracellular members towards the cleavage furrow causes the breakdown thereof which adversely impacts the multiplication of the dividing cells. Preferably, an intervening member is disposed between each insulated electrode and the skin surface and each intervening member includes a conductive “floating” plate that protects against the effects on the patient from a breakdown in the insulation of the electrode.

Described is a device and method for administration of molecules to tissue in vivo for various medical applications, the device comprising a single-needle electrode which provides for the ability, when the needle is inserted into tissue, such as skin or muscle, to pulse tissue with a non-uniform electric field sufficient to cause reversible poration of cells lying along or in close proximity to the track made by the needle upon its insertion into said tissue

Methods and apparatus are provided for obtaining a representation of the distribution of electrical impedance within a multiphase flow with an electrically continuous or discontinuous principle flow contained within an electrically conductive solid ring electrode, including providing a plurality of mutually spaced electrical contacts mounted at the outside wall of the ring and electrically contacting with the ring, applying currents or voltages to the ring from the electrical contacts, generating a more homogeneous electric field distribution within the material, measuring voltage or current distribution alone the ring from other electrical contacts, relatively intensifying the imaging sensitivity at the central area of the sensing domain using a π / 2 angle sensing strategy and reconstructing the representation of the impedance distribution using CG method with an error processing strategy.

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.

In a PM detection sensor, a gas introduction hole is formed in a cover unit which surrounds a PM detection element. The gas introduction hole faces a detection part having detection electrodes of a comb structure. A projected part generated when an opening part of the gas introduction hole is projected on the detection part is within an inside area of the detection part. The projected area of the opening part of the gas introduction hole is positioned within the inside area having a uniform electric field intensity between the detection electrodes. The target detection gas is directly introduced through the gas introduction hole to the area having the uniform electric field intensity generated on the detection part. PM contained in the target detection gas is captured and accumulated on the area having the uniform electric field intensity but not on the area having non-uniform electric field intensity.

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.

The invention relates to a device for contactless manipulation and alignment of sample particles in a measurement volume using a nonhomogeneous electric alternating field, comprising a radiation source for emitting electromagnetic radiation and optical means for guiding the electromagnetic radiation into the measurement volume. The device is characterized in that the optical means include a beam shaping device for generating an intensity profile that is asymmetrical about the beam axis, wherein sample particles in the measurement volume can be trapped in a nonhomogeneous field distribution of the electric field generated by the asymmetrical intensity profile, that for the purpose of entraining sample particles trapped in the nonhomogeneous field distribution there is provided a rotating device to effect rotation of the asymmetrical intensity profile about the beam axis relatively to the measurement volume, and that the electromagnetic radiation beam in the measurement volume is unfocused, more particularly, divergent. The invention further relates to a method for contactless manipulation and alignment of sample particles in a measurement volume using a nonhomogeneous electric field.

An ion detector having a planar electrically conducting entrance plate, a converter assembly including a planar electrically conducting converter plate and a converter member for providing free electrons upon impact of ions, a planar electrically conducting exit plate having an exit window, a magnet assembly, and an electron detection assembly. The planes of the converter plate and the entrance plate are parallel and electrically biasable in order to provide a homogeneous electric field. The magnet assembly provides a homogenous magnetic field between the converter plate and the exit plate, the magnetic field extending parallel to the plane of the converter plate. The ratio between the electric and the magnetic field is such that the electrons emitted from the converter plate travel to the exit window and are detected by the electron detection assembly.

A multi-stage collector of the type used to collect particles from industrial gas. The collector can contain multiple narrow and wide zones formed by a plurality of parallel corrugated plates. Contained in the narrow zones can be elongated electrodes with sharp leading and / or trailing edges. These electrodes can provide a non-uniform electric field near their sharp edges leading to corona discharge. The corona discharge causes particulate matter in the gas flow to become charged. The region in narrow zones away from the sharp edges of the electrodes resembles a parallel plate capacitor with relatively uniform electric field. In this region, particles can be collected on the plates and on the electrode. Wide regions can contain barrier filters (bag filters) with conductive surfaces. The collector can also be used to clean inlet gas in gasification plants and to collect re-usable materials from a gas stream.

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 streamer discharge test system along a surface of an insulating medium, and a method thereof. The streamer discharge test system comprises a streamer discharge generating device and a measurement system. The streamer discharge generating device comprises the components of: a three-electrode structure which is composed of an upper polar plate, a lower polar plate and a needle electrode; a high-voltage DC power supply which is connected with the upper polar plate; and a trigger pulse generating device which is connected with the needle electrode. The measurement system comprises a first processor and three photomultiplier tubes which are connected with three input ends of the first processor. The other input end of the first processor is connected with the output end of the trigger pulse generating device. The three photomultiplier tubes are correspondingly aligned with the tip of the needle electrode, the middle position between the upper polar plate and the lower polar plate, and the lower surface of the upper polar plate. The method of the invention comprises the steps of: arranging an insulating material sample between the upper polar plate and the lower polar plate; applying a high-voltage square-wave pulse on the needle electrode; generating a uniform electric field between the upper polar plate and the lower polar plate; acquiring output signals of the three photomultiplier tubes; measuring a streamer current; and photographing a streamer discharge process and a travel path. The streamer discharge test system can satisfy a requirement for test and research.

Methods of use, accessories and chambers, optimal for performing Pulsed Field Gel Electrophoresis (PFGE) of DNA molecules in ‘Contour Clamped Homogeneous Electric Field’ (CHEF) and ‘Transversal Alternating Field Electrophoresis’ (TAFE) systems, are provided herein. DNA molecules are rapidly separated in the minigels of these chambers. The sizes of chambers and accessories are determined by the separation between the opposite polarity electrodes; which is comprised between 6.2 and 15 cm. Reproducibility of molecule separation is achieved because the accessories warrant homogeneous electric resistance in the buffer and minigels. Chambers allow a high-throughput sample format using the reagents efficiently. It is attained excluding the non-useful electrophoresis zones. For a better optimization, TAFE chambers have several useful electrophoresis zones (UEZ), each carrying a minigel. One or more UEZ can be activated at will in the electrophoresis, to vary the number of minigels, the number of samples and the amount of buffer among the experiments. TAFE chambers having ‘inverted electrode configuration’ with the cathodes at their bottom are presented.

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 provides a rotary direct-current (DC) electric field sensor automatic calibration system. The system comprises an industrial personal computer, a programmable DC power supply, an electric field generation device, and a data acquisition card. The output end of the industrial personal computer is connected with the programmable DC power supply, and the industrial personal computer is used for controlling the output voltage of the programmable DC power supply. The output end of the programmable DC power supply is connected with the electric field generation device, and the programmable DC power supply is used for providing voltage for the electric field generation device. A rotary DC electric field sensor is fixed on the electric field generation device, and the electric field generation device is used for providing a uniform electric field for the rotary DC electric field sensor. The input end of the data acquisition card is connected with the output end of the rotary DC electric field sensor, the output end of the data acquisition card is connected with the industrial personal computer, and the the data acquisition card is used for transferring the output signals of the rotary DC electric field sensor to the industrial personal computer. Through the technical field provided by the invention, automatic calibration of the rotary DC electric field sensor is realized, the efficiency of rotary electric field sensor calibration is improved greatly, the time for calibration is shortened, and the calibration precision is improved.

The invention discloses a method and apparatus for treating organic wastewater by pulse discharge plasma inducting photocatalysis, wherein an electrode construction with strong uneven electric fields and narrow impulse high voltage supply power supply are employed to form impulse corona flow optical electric discharge in the water, the flow light and sparks produced by the electrical discharge are used as luminous source to induce the optical catalytic activity of the semiconductor catalyst in the electric field.

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 discloses a test method for assessing transformer oil breakdown voltage in a high-voltage DC electric filed, and belongs to the technical field of power grid transmission and transformation. In the high-voltage DC electric filed, a cup for a ball-type electrode or a cup for a flat plate-type electrode is adopted, high voltage is connected into a pin-type electrode end, a ground line is connected into the ball-type electrode or a flat plate-type end, positive polarity DC voltage and negative polarity DC voltage are respectively adopted, and boosting is carried out according to a fixed rate. When breakdown happens to the transformer oil, boosting is stopped and the voltage value at the time is recorded, test is repeated for multiple times, and the average value of multiple test results serves as the breakdown voltage of the transformer oil. As the cup for a ball-type electrode or the cup for a flat plate-type electrode is adopted during the test process, an electrode type with an uneven electric field can be formed, the electrode structure can reflect polarity effect features of the electric field in the DC electric filed, the components and polarity effect correlation of the converter transformer oil can also be detected.

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.