310results about How to "Avoid polarization" patented technology

An electric sensor array which is provided with several sensor positions that each have at least two microelectrodes. Molecular substances can be detected electrochemically and charged molecules can be transported or handled using the array. Measuring procedures can be effected, especially using two addressing procedures, in which sensor positions can be individually addressed and electrochemically or electrically controlled by pairing or in groups for voltage or impedance measurements. For biomolecular assays, affinity-binding molecules can be immobilized at the sensor positions, between the microelectrodes, or on auxiliary surfaces.

The invention relates to a method for preparing a lithium ion battery anode material doped with a nanometer oxide, belonging to the technical field of manufacturing processes of lithium ion battery batteries. The method is characterized in that trace amount of nanometer oxide power is doped in the preparation process of lithium manganate, lithium cobaltoxide and lithium iron phosphate; the doping amount is 0.5-1.0 mol percent of lithium salts; and the nanometer oxide is selected from one or two of alumina, magnesia, titanium oxide, chromic oxide, nickel oxide, monox and zirconia and the nanometer oxide is subject to ball milling, drying, sieving, calcinating, crushing, grading and other processes to obtain the nanometer oxide doped or coated lithium ion battery anode material. The lithium ion battery anode material has reversible initial capacitance, and remarkably-improved attenuation property, charging-discharging properties, high-temperature circulating property and electrochemistry stability.

The present invention provides a hollow fiber membrane module comprising hollow fiber membrane element or elements in a pressure vessel, in which a feed fluid can be supplied to a feed fluid distribution pipe disposed at a center portion of each hollow fiber membrane element, the pressure vessel having at least two feed fluid passage nozzles on the outer peripheral side in the vicinity of one end and at least two concentrated fluid passage nozzles on the outer peripheral side in the vicinity of the other end; and a hollow fiber membrane module arrangement group that comprises such hollow fiber membrane modules and substantially eliminates need for header pipes at the supply side and the concentration side.

The invention relates to a preparation method for a positive electrode material of a power lithium ion battery. The preparation method comprises the following concrete steps: preparing a graphite oxide solution, then preparing a nanometer FeF3 particle and preparing a non-supported FeF3/graphene oxide film; and subjecting the obtained non-supported FeF3/graphene oxide film to photoreduction so as to obtain the positive electrode material of the power lithium ion battery, i.e., a FeF3/graphene film. According to the invention, the phenomenon of severe polarization of a FeF3 material in cyclic process of the battery is effectively overcome; meanwhile, FeF3/graphene oxide is innovatively reduced by using a latest photoreduction method so as to overcome the disadvantages of production of Fe and agglomeration of nanometer particles in reduction of FeF3 by using a traditional high temperature reduction method, and specific capacity of the positive electrode material of the power lithium ion battery is substantially improved. The preparation method provided by the invention is simple; the prepared FeF3/graphene film can be directly used as the positive electrode material of the power lithium ion battery, and addition of other conductive additives and binders is avoided; and the positive electrode material has good ductility and flexible processability and is suitable for industrial large-scale production.

The invention provides a blue LED epitaxial structure with a suppression polarization effect barrier layer, and relates to the technical field of light emitting diodes. The blue LED epitaxial structure comprises a substrate, an AlN buffer layer, a U-type GaN layer, an N-type GaN layer, a shallow quantum well layer, an active region, an electron blocking layer, and a P-type GaN layer in sequence from bottom to top, the suppression polarization effect barrier layer is inserted between the shallow quantum well layer and the active region, and the suppression polarization effect barrier layer comprises an AlxGal-xN layer and a SiN layer from bottom to top. According to the blue LED epitaxial structure, a novel barrier layer is inserted into the conventional epitaxial structure, the stress is released, polarization is suppressed, the defect density is reduced, the radiative recombination probability is improved, the polarization effect is reduced, and the quantum efficiency in the LED is improved.

Unique multi-diffraction structures using electronically controlled Bragg diffraction devices such as acousto-optic (AO) devices to accomplish optical beam attenuation control functions. These variable optical attenuator (VOA) modules can be fully inertialess as they can use electronically programmable sub-microsecond speed AO devices to implement optical gain controls. These VOAs deliver desirable capabilities in one optically reversible unit, making high dynamic range, low loss, high power handling, ultra-fast, high optical isolation, broadband operation, self-aligning robust modules. These VOAs can be made essentially independent of the optical polarization of the incident light by the use of a unique fixed waveplate compensation technique within the VOA configuration that suppresses polarization dependent loss. Broadband gain control operation over several wavelengths can be achieved by controlling the frequency and electrical drive power of the chosen frequencies feeding the acousto-optic devices. Interleaver devices can be cascaded with the acousto-optic modules to improve wavelength selectivity of the overall VOA modules. Alternative embodiments can use electrically programmable Bragg gratings in polymer dispersed liquid crystal and acousto-optic tunable filter devices as Bragg grating devices. Embodiments are proposed using independently controlled Bragg diffractions using multiple drive signals connected to multiple device transducers. Drive signal formats can be digital, analog, or a combination for simultaneously driving the VOA modules. Dual-mode VOA module designs are also described using mirror positioning.

The invention relates to a storage battery non-damage rapid balanced charger and a control strategy thereof, belonging to a switch power supply type charger and a control method thereof. The storage battery non-damage rapid balanced charger comprises a utility power interface, a charging interface, a rectification circuit, a filtering voltage-stabilizing and current-stabilizing circuit, a micro-processing unit, a power factor correcting circuit, an intelligent half-bridge chopper circuit, a reverse-pole discharge circuit and a storage battery parameter dynamic sampling circuit; the control strategy comprises the steps that when the utility power interface is connected with utility power, the micro-processing unit can acquire the information of a storage battery by the storage battery parameter dynamic sampling circuit; after the sampling information is acquired, the micro-processing unit is used for pretreating the sampling information, and the maximum initial charging current which is allowed by the storage battery at the moment is calculated; and after the maximum initial charging current value is obtained, the micro-processing unit can be used for rapidly charging the storage battery. The charger can track the dynamic change of the internal parameters of the storage battery immediately according to the control strategy, and leads a charging object of the storage battery to be controlled to be a unit single body by adopting a secondary wave-chopping sectional control method and a positive and negative pulse rapid charging technology, thus having the advantages of non-damage rapid balanced charging and the like.

The invention discloses a device for coating graphene on surfaces of metal foils. The device comprises a control unit, and an unwinding unit, a coating printing device, a baking unit and a winding unit arranged in sequence in a moving direction of the metal foils; the metal foils are aluminum foils or copper foils; the coating printing device comprises a pressing roller, a driving silica gel roller and a driving steel roller laminated from top to bottom; the driving silica gel roller and the driving steel roller are rotated in opposite directions by keeping a micron gap; the driving steel roller is dipped in a colloid pool with viscous materials; and a substrate is arranged between the pressing roller and the driving silica gel roller. The device realizes uniform spraying of materials with submicron thicknesses and thinner layers on the surface of the substrate to meet the thickness requirements of the graphene coated on the metal foils, and achieves excellent adhesion to effectively reduce the contact resistance between carbon particles and the metal foils.

A method for measuring the electric conductivity of a solution includes measuring voltage and current, calculating active value, deriving the calculation equation of electric conductivity, and calculation. Electric conductivity of solution is indirectly calculated by measuring consumption W of solution.

The invention discloses a polarization shift keying demodulation method and a system. The method comprises the steps of: splitting a single-frequency continuous laser wave beam in an adjusted polarization state into a horizontal polarized light wave beam and a vertical polarized light wave beam which are orthogonal to each other, and conducting polarization shift keying modulation to one light wave beam to form a polarization shift keying modulated light wave beam; keeping the polarization state of the other light wave beam to be unchanged and using the other light wave beam as a reference light wave beam for the polarization shift keying modulated light wave beam; combining the polarization shift keying modulated light wave beam with the reference light wave beam, successively conducting power amplification, filtration and transmission, filtering carrier signals, converting into light current, then converting into light voltage and judging in a voltage comparator to obtain data corresponding to polarization shift keying modulation signals. By using the polarization shift keying demodulation method and the system, matched dynamic polarization control is not required during demodulation judgment at a receiving end, a transmitting end is not required to conduct differential encoding to the data and the complexity of the transmitting end is reduced; and a local light source is not required, the requirements on the accuracy and stability of a light path are reduced and the cost is saved.

The invention relates to a positive electrode material for a lithium sulfur battery. The positive electrode material is a graphene doped porous hollow fiber, and the doping amount of graphene is 0.005-0.2% of the total mass of the positive electrode material; the porous hollow fiber is a porous hollow tubular structure, the external diameter of the tube is 80-1000nm, the internal diameter of the tube is 30-400nm, and the aperture of pores on the sidewall of the tube is 2-80nm; and graphene is embedded into the sidewall of the porous hollow fiber tube. A battery assembled by adopting a positive electrode made by using the positive electrode material has high discharge specific capacity and good cycle stability.

The invention discloses a measuring device of soil conductivity, mainly comprising a sensor unit and a data acquisition and processing unit; the sensor unit mainly comprises electrodes which are configured in a linear equal interval manner; the data acquisition and processing unit mainly comprises a voltage conversion circuit, a signal conditioning circuit, an analog-to-digital converter, a data controller and a liquid crystal display circuit, and also comprises a alternating-current source signal generating circuit, an alternating-current constant current source output circuit and an alternating-current constant current source regulating circuit. According to the measuring device of soil conductivity, the invention also discloses a measuring method of soil conductivity. The invention can regulate the size of exciting current input into the soil at any time according to soil characteristics of the measured farmland so as to guarantee that the sensor works at the linear area under any soil condition, has high measuring accuracy and also has the function of data display and storage.

The invention provides a liquid flow frame of a Fe/Cr flow battery and an electric pile consisting of the liquid flow frame. A runner for flowing of an electrolyte is formed in the liquid flow frame and comprises a sharing channel, two snakelike runners, uniform-distributing tanks, horn mouths and uniform-flowing tanks, wherein the electrolyte flows into single batteries through the sharing channel and flows into the snakelike runners through runners in a pole plate, multiple horn mouths are formed in the tail end of each snakelike runner, and all the horn mouths are communicated to the uniform-flowing tanks. A battery pile is formed by multiple single batteries through series connection, wherein each single battery comprises a positive electrode, a negative electrode, a diaphragm, a positive electrode electrolyte and a negative electrode electrolyte, the positive electrode consists of a bipolar plate and a carbon felt and is arranged in the liquid flow frame, and four sides, opposite to the liquid flow frame, of the bipolar plate are surrounded by a package type sealing structure.

The invention discloses a double-coated composite solid-state lithium manganate material and a preparation method thereof. The preparation method comprises the following steps of mixing and sinteringa lithium salt, a titanium salt, an aluminum salt and a phosphate raw material to obtain a solid-state electrolyte lithium titanium aluminum phosphate (Li <1+x> Al <x> Ti <2-x> (PO4) 3 (LATP); addingLATP, single crystal lithium manganate, a graphene oxide aqueous solution and zirconium oxide balls into a sand mill to be fully ground, nanocrystallizing the LATP and attaching the LATP to the surface of the lithium manganate, and meanwhile, coating the lithium manganate with graphene oxide; and after drying, reducing the graphene oxide into graphene at a high temperature in a hydrogen atmosphereto obtain the solid electrolyte and the graphene double-coated lithium manganate positive electrode material. According to the method, the consistency and repeatability of the material are ensured, the manufacturing cost is low, the solid electrolyte can inhibit the dissolution of manganese, the graphene blocks the reaction between the electrolyte and the positive electrode material, and the cycle performance and the high-temperature performance are improved.

The invention discloses a permanent magnet excitation method for electromagnetic flow meter. Said method includes the following steps: the permanent magnet can produce working magnetic field which is respectively perpendicular to conductive fluid flow-rate direction and electrode connected-wire direction, flow signal can be detected by electrode and fed into preamplifier portion, the preamplifier portion can be used for making impedance matching and differential amplification, then the obtained signal is fed into signal processing finally the processed signal can be fed into microprocessor portion, said microprocessor can be used for making calculation of flow, said flow value can be fed into display portion to display said flow value. It is simple in structure, can effectively detect flow signal and can effectively raise response speed of electromagnetic flow meter.

The invention discloses an electroacoustic transducer. The electroacoustic transducer comprises an oscillating system, a magnetic circuit system, and a shell for accommodating and fixing the oscillating system and the magnetic circuit system, wherein the oscillating system comprises an oscillating diaphragm and a voice coil which is jointed on one side of the oscillating diaphragm; the shell has a metal structure; the electroacoustic transducer further comprises a centering disk which is jointed with the oscillating system; a hard reinforcing part is arranged on the edge of the centering disk; a welding pad and a circuit for electrically connecting the welding pad and the centering disk are arranged on the reinforcing part; the voice coil comprises a voice coil lead; and the voice coil lead is electrically connected with the centering disk. By adopting the structure, the oscillating diaphragm can be protected from polarization; and an operating process for electrically connecting with an external circuit is simple.

The invention relates to sewage treatment equipment using expanded anode for electrolytically decomposing cyanide, which comprises a shell, a cathode plate, an anode plate, a particle electrode filled between the cathode plate and the anode plate, a direct current power supply connected with the cathode plate and the anode plate, a water inlet groove, a water inlet, a water outlet, a water outlet groove, a drain pipe, an aerator pipe and a mud hole. The sewage treatment equipment is improved in the following aspects: the cathode plate and the anode plate are vertically and oppositely fixed in the shell in parallel; an insulating layer is adhered to the surface of the cathode plate; and the particle electrode is made of the same material as the anode plate and together with the anode plate forms an expanded anode. The equipment is divided into a plurality of independent reaction chambers by polar plates in the equipment; the waste water is uniformly distributed by the water inlet groove, flows upwards from the lower water inlets of the reaction chambers to pass through the reactors and flows out from the upper water outlets to converge into the water outlet groove. Each reaction chamber is filled with the particles of a material the same as the anode material, so the anode area is expanded and the mass transfer effect and the reaction efficiency are improved. Thus, the cyanide in the waste water is degraded efficiently.