120results about How to "Not easy to saturate" patented technology

The invention discloses a high-performance direct current amplification device for acquiring biological electric signals, which comprises an input protection / filter circuit, an input buffer circuit, an instrument amplifying circuit, an RC low-pass filter circuit, an analog-digital conversion and peripheral circuit and a CPU connected in sequence, wherein the input protection / filter circuit acquires the biological electric signals and inputs the biological electric signals into the input buffer circuit, and then the biological electric signals pass through the instrument amplifying circuit, the RC low-pass filter circuit and the analog-digital conversion and peripheral circuit in turn; and the CPU controls the analog-digital conversion and peripheral circuit to work. The high-performance direct current amplification device performs impedance conversion on the biological electric signals first, then amplifies the signals, inhibits common-mode signals, and filters high-frequency noise, and a single-end transfer differential amplifier performs secondary amplification on the biological electric signals, so the indexes such as the noise, the common-mode rejection ratio and the like of the signals after analog-digital conversion reach a very high level; besides, a base line is very stable, the signal input dynamic range is large and is difficult to saturate, and simultaneously required devices are fewer, and the reliability of the high-performance direct current amplification device is improved.

The invention discloses a waste gas treatment air purification device which comprises a unit case, a waste gas inlet pipe, and an air inlet pipe; the invention is characterized in that a water tank is disposed at the bottom inside the unit case; a photolytic light source, a filler layer, a spraying layer, and an active carbon layer are orderly mounted above the water tank; the waste gas inlet pipe and the air inlet pipe extend into the water tank at one side of the unit case. With a water-attack deduster principle, the invention allows organic waste gas to dissolve into water through high-speed air flow, performs cracking by using high-energy high-ozone ultraviolet light beams, performs air purification with the synergic photolysis of the fillers and spraying, and finally reaches the national discharge standard; the invention is simple in operation, convenient for maintenance, and integrated in structure, greatly reduces production cost, and realizes thorough purification of toxic and harmful gas.

The invention discloses a method for preparing shiitake bioactive peptide. The method specifically comprises the following steps that (1) distilled water with the weight 6-12 times that of shiitake foot powder is added to the shiitake foot powder and the shiitake foot powder is dissolved; (2) ultrasonic disruption is conducted, 100 thousand to 200 thousand international units of cellulase are added to per kilogram of the shiitake foot powder, the pH value is adjusted to be 4.0 to 5.0, the temperature is adjusted to be 40 DEG C to 50 DEG C, and hydrolyzing lasts for 60 min to 120 min; (3) the shiitake foot powder solution is cooled to the indoor temperature, the pH value of the shiitake foot powder solution is adjusted to be 9.5 to 10.5 by sodium hydroxide, cold bath extraction is conducted for 20 min to 40 min at the temperature of 5 DEG C to 15 DEG C, supernate is extracted in a centrifugal mode, pressure reduction concentration is conducted, absolute ethyl alcohol is added until the concentration reaches 83% to 85%, standing is conducted for 60 min to 90 min at the temperature of 4 DEG C, centrifugation is conducted, precipitate is collected, and shiitake protein is obtained after drying; (4) the shiitake protein is dissolved in distilled water with the weight 40-60 times that of the shiitake protein, the pH value is adjusted to be 6.0 to 7.0, 0.2%-0.4% compound protease is added for hydrolysis, the temperature ranges from 45 DEG C to 55 DEG C, hydrolysis is conducted for 150 min to 200 min, enzyme deactivation is conducted, centrifugation is conducted, and filtrate is collected; (5) microfiltration is conducted through a filtering film of 0.22 micron, ultrafiltration is also conducted, peptide fragments with relative molecular mass ranging from 5 KD to 10 KD are collected, vacuum freeze drying is conducted, and therefore brown freeze-dried powder of the shiitake bioactive peptide is obtained. The prepared shiitake bioactive peptide has the good antioxidant activity in vitro and sobering activity.

The invention discloses a direct-axis magnetic field enhanced type wide-range speed control permanent magnet brushless motor for an electric automobile. A magnetic barrier fills each slot of a rotor, and the magnetic barriers are symmetrical relative to a centerline, i.e., a quadrature axis, of slot parts of the rotor; four sections of arc-shaped permanent magnet steel are fixedly embedded on each tooth part of the rotor, the four sections of arc-shaped permanent magnet steel are divided into an inner layer and an outer layer, two sections are arranged on each layer, the two sections of permanent magnet steel on each layer are the same in structure and are symmetrical relative to a centerline, i.e., a direct axis of the tooth parts of the rotor, the two sections of permanent magnet steel on the same layer do not run through each other and are not connected with each other, and an arc-shaped magnetic bridge is formed between the two sections of permanent magnet steel; a circle center of each section of permanent magnet steel is located on the diameter of the rotor; the direct-axis inductance of the motor is larger than the quadrature-axis inductance, so that the motor can adopt a control method with zero direct-axis current and can also adopt a direct-axis magnetic field enhanced control method during low-speed operation or startup, and can adopt a coordinated control method of direct-axis magnetic field enhancement and slight direct-axis magnetic field weakening during high-speed operation, and the speed control range is wider.

The invention relates to a wastewater treatment technology for manual wetland by using a reinforced compound stuffing in a multilevel shift process, which comprising the following steps: firstly, the wastewater is sent into a desilting basin unit to remove the sundries and suspended substances in the water body; secondly, the wastewater is sent into the wetland group unit to be purified and then discharged; wherein, the wetland group unit comprises a plurality of vertical current wetland units connected in series with each other and the wastewater is sent into the wetland units in sequence during the purifying treatment. When one wetland unit is in the process of purifying wastewater, the other wetland units are kept in an empty bed status. The invention has the advantages that firstly, the shift between the anoxic form and the aerobic form is realized in time and space, the denitrification capability of the wetland system is increased greatly and the problem that the bed is blocked due to the excess growth of the biomembrane on the stuffing carrier is avoided; secondly, the water quality of the effluent is favorable, the elimination efficiency of nitrogen and phosphorus is up to 95%, the effluent of the domestic wastewater treated by the technology can reaches the wastewater renovation standard; thirdly, the shock resistance loading ability of the system is high, the occupied area is small, the technology is not only suitable for domestic wastewater in urban areas, wastewater with high concentration nitrogen and phosphorus, but also applicable for lake and river water bodies which are seriously eutrophicated.

The invention discloses a strip LiDAR data upscaling-based forest biomass estimating method. A method implementation object is a subtropical natural secondary forest at a hilly area of southern Jiangsu Province; 9 characteristic variables are extracted from LiDAR strip data and are combined with ground estimated biomass to invert biomass continuous distribution information in a strip, sampling operation is conducted in a strip inverting result zone, samples are combined with Landsat OLI image characteristic variables covering a whole research zone, and biomass of the whole research zone can be estimated in an upscaling manner. Based on full acquisition of remote sensing data characteristic information, forest farm level biomass estimation cost is lowered via strip LiDAR data, and biomass estimating precision of a remote sensing method on the scale is improved.

The invention discloses a rolling bearing fault diagnosis method based on a two-way memory cycle neural network. An existing rolling bearing fault diagnosis method does not consider a single logical structure characteristic of data after characteristic extraction and a fault type can not be integrally determined from the data when fault data is processed. Aiming at the above defects, the method of the invention comprises the following steps of firstly, acquiring a program data sample, carrying out standardized preprocessing on vibration acceleration data, making the collected data accord with standard normal distribution, and then using a time-frequency domain characteristic extraction algorithm to obtain 512 time-frequency domain characteristic vectors; then, constructing an improved two-way memory type cycle neural network fault diagnosis model, using an idea of a simple design, and then using sample data to train a neural network weight parameter, after iteration training, generating a model which can map a relationship between bearing data and a fault type, wherein the designed memory-type cycle neural network includes a forgetting gate, an input gate and a cellular state; and finally, using the model to carry out fault analysis so as to achieve accurate diagnosis of a rolling bearing fault.

The invention provides a special fault indicator for a high-voltage power transmission network cable line. The special fault indicator comprises a measurement module, a power taking module, a power supply module, an energy storage module, an MCU (microprogrammed control unit) and a communication module, wherein the measurement module is connected with an ADC (analog-to-digital converter) unit in the MCU and is used for transmitting acquired current data of the cable line to a central processing unit in the MCU through the ADC unit and performing cable fault judgment through the central processing unit; the communication module is used for uploading the current data of the monitored cable line and fault signals obtained through judgment to an upper system; the power taking module is used for acquiring electric energy from the cable line through induction, is connected with the energy storage module and charges the energy storage module; the power taking module is connected with the power supply module and supplies power to the MCU; when the cable line has a fault, the energy storage module replaces the power taking module to supply stored power to the MCU. According to the special fault indicator for the high-voltage power transmission network cable line, effective electrical quantity detection can be performed on grounding faults and short-circuit faults of the high-voltage cable, and fast online fault positioning of a fault section is realized.

The invention discloses biological fermented bran and a production method, which belong to the technical field of biological fermentation. Wheat bran is used as a raw material, lactobacillus liquid is added, the material-liquid ratio is regulated to be 1:0.5 to 1:1.5, the mixture is fermented at the temperature of 25 to 50 DEG C for 2 to 3 days, and the fermented mixture is dried and pulverized to obtain the solid fermented bran. By adopting the solid fermentation, the process is simple, and the cost is low. The final product, fermented bran, is golden yellow, and is rich in lactic acid, probiotics and small peptide and thick in fragrance, the antioxidant capacity of the fermented bran is greatly improved compared with that of the raw material, no phytic acid or main mycotoxin can be detected after the fermentation, and the biological fermented bran is safe animal feed which can promote the ingestion of animals and improve the animal immunity and is easily digested.

The invention discloses a DC relay capable of arc extinguishing and resisting short-circuit current. The DC relay comprises two static contact leading-out ends, a straight sheet type movable contact spring, a push rod component and two pieces of magnetic steel. The two pieces of magnetic steel are arranged at the positions, corresponding to the moving contacts and the static contacts, of the two sides of the width of the movable reed respectively, the moving contacts and the static contacts corresponding to the two pieces of magnetic steel are different to achieve magnetic quenching, an uppermagnetizer is installed above the movable reed, and a lower magnetizer is installed below the movable reed. At least one through hole is formed in the movable reed, so that the upper magnetizer and the lower magnetizer can get close to each other or make contact with each other through the through holes, and at least two independent magnetic conducting loops are formed by the upper magnetizer andthe lower magnetizer in the width direction of the movable reed. According to the invention, by utilizing the magnetic pole surfaces added at the positions corresponding to the through holes of the magnetic circuits, when the movable contact spring has faults and large current, suction force in the pressure direction of the contacts is generated, so that electric repulsion force generated betweenthe movable contact spring and the leading-out end of the static contact due to the fault current is resisted.

The invention discloses a magnetism increasing type internal tangential adjustable flux motor, belongs to the field of permanent magnet motors and solves a problem that uncontrollable demagnetization of an aluminum nickel cobalt permanent magnet is easy to occur when a flux weakening type adjustable flux motor runs at high load. The magnetism increasing type internal tangential adjustable flux motor comprises a stator core, an armature winding, a rotor core, a rotating shaft, tangential permanent magnet slots, p neodymium iron boron magnetic poles, p aluminum nickel cobalt magnetic poles and p quadrature axis magnetism barriers, wherein p is an even number; the p tangential permanent magnet slots and the p quadrature axis magnetism barriers are uniformly arranged on the rotor core along the circumferential direction of the motor, and each quadrature axis magnetism barrier is of a mirror symmetry structure centering on one tangential permanent magnet slot; the tangential permanent magnet slots and the quadrature axis magnetism barriers axially penetrate through the whole rotor core; one neodymium iron boron magnetic pole and one aluminum nickel cobalt magnetic pole are both arranged in each tangential permanent magnet slot; each neodymium iron boron magnetic pole is arranged in a position close to the inner circle of a rotor in the tangential permanent magnet slot; and each aluminum nickel cobalt magnetic pole is arranged in a position close to the outer circle of a rotor in the tangential permanent magnet slot.

The invention discloses a preparation method of fermented rice bran feed and an application thereof. The preparation method of the fermented rice bran feed disclosed by the invention comprises the following steps: adding a complex microbial inoculant and a complex enzyme preparation into a fermentation raw material taking rice bran as a main component to obtain a fermentation system, and fermenting the fermentation system to obtain a fermentation product which is the fermented rice bran feed, wherein the active ingredients of the complex microbial inoculant are bacillus subtilis, bacillus licheniformis, lactobacillus plantarum, lactobacillus casei, enterococcus faecalis, saccharomyces cerevisiae and candida utilis; the active ingredients of the complex enzyme preparation are cellulase, acid protease, amylase, beta-mannase, xylanase and beta-glucanase. The shelf life of the obtained fermented rice bran feed is prolonged, and the production performance of mammals and the yield and quality of produced milk can be further improved by utilizing the obtained rice bran fermented feed.

This invention discloses a filter for correcting supply waveforms including a parallel non-linear resistor and a first capacitor, a first inductor and a second inductor with coils of the same turns winded on a same magnetic core reversely, a second capacitor and a third and fourth capacitors in series, in which, the two input ends of the two inductors are connected to both ends of the first capacitor, the second capacitor is bridged between the outputs of the first two inductors, the serial ends of the third and the fourth capacitors are bridged between the outputs of the first two inductors to be parallel to the second capacitor, the connecting point of the third and fourth capacitors is connected to the earth, the filter also includes a first resistor connected between the output of the first inductor and the input of the second inductor and said core is a nano-grain alloy ring one.

In order to overcome the problems of large output power fluctuation, short transmission distance and poor electromagnetic compatibility in an existing wireless power supply magnetic coupling mechanism, the invention provides a three-phase type magnetic coupling mechanism applied to dynamic wireless power supply of vehicles, and belongs to the technical field of wireless power energy transmission.The three-phase type magnetic coupling mechanism comprises a power supply track used for transmitting power energy and a power energy receiving device; the power supply track is mounted below a road in the travelling direction of a vehicle and comprises three-phase power supply cables and a power supply track magnetic core, and the three-phase power supply cables are wound around the power supplytrack magnetic core; the three-phase power supply cables generate a magnetic field after being energized and transmit the power energy to the power energy receiving device; the matching mode of the three-phase cables and the power supply track magnetic core is cross winding or sequential winding; the rest of the three-phase power supply cables is same except that the space positions of the three-phase power supply cables in the vehicle travelling direction have difference of a one-third vehicle travelling cycle distance in the space position, and the power energy receiving device is mounted ona vehicle chassis, voltage is generated through a electromagnetic induction principle to supply power to a load, and wireless transmission of the power energy is achieved.

The invention relates to a method for producing small peptide amino acid microelement chelate by way of the acid hydrolysis of protein. Animal protein or vegetable protein is adopted as raw material, and is hydrolyzed by hydrochloric acid. Hydrolysate is subjected to rough filtration and microfiltration, filtrate is deacidified by a nanofiltration membrane separation system, and the deacidified liquor is purified by way of ultrafiltration separation. Obtained small peptide and amino acid, the molecular weight of which is less than 1000 Dalton, are chelated with microelements, so that the small peptide amino acid microelement chelate is produced. The method is suitable for industrial production, the production cycle is short, the product yield is high, the three wastes cannot be produced in the process of production, and the product has good chemical stability, is rich in nutrition, can be easily digested and absorbed, can resist interference, is nonirritant, has the effect of improving the immunity of body, and is an ideal food nutrition enhancer and feed additive. The invention has a positive and profound significance on promoting the development of feed industry and breeding industry, enhancing the safety of poultry, livestock and aquatic products and protecting the health of human being.

The invention provides a magnetic increase built-in V-shaped adjustable flux motor, belongs to the field of permanent magnet motors, and aims at solving the problem of uncontrolled demagnetization of an aluminum-nickel-cobalt permanent magnet when a weak-magnetic adjustable flux motor runs under a high load. According to the scheme, the magnetic increase built-in V-shaped adjustable flux motor comprises a stator core, armature windings, a rotor core, a rotating shaft, V-shaped permanent magnet slots, neodymium-iron-boron magnetic poles, aluminum-nickel-cobalt magnetic poles, magnetic bridges and quadrature axis magnetic barriers, wherein the rotor core is fixed on the rotating shaft and is located in the stator core; the armature windings are arranged on the stator core; the V-shaped permanent magnet slots and the quadrature axis magnetic barriers are alternately and evenly arranged on the rotor core along the circumferential direction, and run through the overall rotor core along the axial direction; each V-shaped permanent magnet slot comprises two rectangular mounting slots; a group of neodymium-iron-boron magnetic poles and aluminum-nickel-cobalt magnetic poles are arranged in each rectangular mounting slot; the neodymium-iron-boron magnetic poles are arranged at the middle part of each V-shaped slot; and the aluminum-nickel-cobalt magnetic poles are arranged at two ends of each V-shaped slot.

The present invention relates to the field of magnetoelectric technology, in particular to a ring-shaped differential-mode inductor and a production method thereof. The ring-shaped differential-mode inductor includes a ring-shaped magnetic core and a coil, and the ring-shaped magnetic core is connected by a first magnetic core and a second magnetic core. In combination, the window in the middle of each turn coil forms a magnetic core channel, and the first and second magnetic cores are inserted into the magnetic core channel and then docked. The production method of the annular differential mode inductor comprises the following steps: winding the coil by a winding machine, respectively passing the first and second magnetic cores through the coil, while the second magnetic core is passed through the other end of the coil core channel, and the The starting and tail wires are stripped and soldered. In the present invention, the coil passes through the magnetic core after being wound by a winding machine. The winding process is simple, which solves the problem that the wire diameter is too large and cannot be wound. At the same time, it reduces the labor intensity of workers and improves production efficiency; The copper wire will be damaged or have pinholes during the process, which improves the yield.

The invention provides a mushroom bran protein peptide capable of replacing fish meal and a preparation method and application of the mushroom bran protein peptide in aquaculture, and belongs to the technical field of microorganisms and aquaculture feed. Edible mushroom bran waste serves as a basic raw material, firstly, the step-by-step solid fermentation technology in which ganoderma lucidum is used firstly and then brewer yeast is used is adopted, original nutrients of edible mushroom bran are fully converted into high-quality bacterial protein and polysaccharides; then, the enzymolysis technology combining cellulose, edible mushroom hydrolase and yeast extracted enzyme is adopted, the protein is fully released and hydrolyzed into low-molecular-weight small peptides; finally, the mushroom bran protein peptide product rich in the small peptides easy to digest and high in DPPH free radical removal capacity is obtained through concentration and drying. The preparation method of the mushroom bran protein peptide has the advantages of being high in utilization rate of mushroom bran, high in product yield, easy to operate, high in practicality and convenient to popularize. The mushroom bran protein peptide is used for aquaculture feed, can partly replace the fish meal, and has the functions of promoting growth of aquatic animals and increasing the feed utilization rate.

An inductor type synchronizer includes: field side stators (11, 15) having field coils (18, 31) where an N pole and an S pole are formed concentrically; rotors (12, 14) having N pole inductors (20, 28) arranged to oppose to the N pole of the field coils (18, 31) and S pole inductors (21, 27) arranged to oppose to the S pole of the field coils (18, 31), and having a fixed rotation axis (34); and an armature side stator (13) having an armature coil (24) arranged to oppose to the N pole inductors (20, 28) and the S pole inductors (21, 27).

The invention discloses a magnetic circuit mechanism contactless power transmission device, and relates to the technical field of contactless power transmission. A magnetic circuit mechanism primary side of the device is composed of a plurality of independent magnetic energy emission mechanisms connected in parallel. A magnetic circuit mechanism secondary side is composed of a plurality of independent magnetic energy pick-up mechanisms connected in series. The magnetic energy emission mechanisms are arranged on the running track of a locomotive, and the magnetic energy pick-up mechanisms are correspondingly installed at the bottom of the locomotive. The magnetic energy emission mechanisms and the magnetic energy pick-up mechanisms are of the same structure, and are composed of a receiving coil and a power conversion circuit. Each receiving coil includes at least two wound wire coils, each wire coil is connected with a rectifier module, and the rectifier modules output power. The device has the following advantages: the circuit topology is simple, and the power transmission ability of the system is strong; the magnetic cores of the pick-up mechanisms are not easy to saturate, and the pick-up mechanisms do not interfere with one another; the magnetic energy utilization rate of the primary side is high, and the system efficiency is high; and the device is suitable for providing high-power efficient energy transmission for a guide rail type contactless power transmission system.

The invention provides a wavelength-coding-technology-based frequency response testing device for a photoelectric detector. The wavelength-coding-technology-based frequency response testing device comprises an optical wavelength coding generator, an optical isolator, an optical fiber coupler, an optical delay line, an optical polarization controller, a photoelectric detector to be detected, and a beat frequency signal detector, wherein an input end of the optical isolator is connected with an output end of the optical wavelength coding generator; a port (1) of the optical fiber coupler is connected with an output end of the optical isolator; one end of the optical delay line is connected with a port (2) of the optical fiber coupler; one end of the optical polarization controller is connected with the other end of the optical delay line; the other end of the optical polarization controller is connected with a port (4) of the optical fiber coupler; an input end of the photoelectric detector to be detected is connected with a port (3) of the optical fiber coupler; and an input end of the beat frequency signal detector is connected with an output end of the photoelectric detector to be detected. The wavelength-coding-technology-based frequency response testing device for a photoelectric detector can quickly and visually acquire the frequency response for the photoelectric detector.

The invention provides a magnetic-increase radial interior line-styled adjustable flux motor, belongs to the field of permanent magnet motors and aims at solving the problem that uncontrollable demagnetization of an aluminum-nickel-cobalt permanent magnet is easily generated when a weak magnetic type adjustable flux motor is in high load operation. The magnetic-increase radial interior line-styled adjustable flux motor comprises a stator core, armature windings, a rotor core, a rotating shaft, line-styled permanent magnet slots, p neodymium-iron-boron magnetic poles, 2p aluminum-nickel-cobalt magnetic poles and p quadrature-axis magnetic barriers; wherein the rotor core is fixed on the rotating shaft and is located in the stator core; the armature windings are arranged on the stator core; p is an even number; p line-styled permanent magnet slots and p quadrature-axis magnetic barriers are alternately and uniformly arranged on the rotor core along the circumferential direction of the motor; the line-styled permanent magnet slots and the quadrature-axis magnetic barriers penetrate through the overall rotor core along the axial direction; each line-styled permanent magnet slot is provided with one neodymium-iron-boron magnetic pole and two aluminum-nickel-cobalt magnetic poles; each neodymium-iron-boron magnetic pole is arranged at the middle part of the corresponding line-styled permanent magnet slot; and the aluminum-nickel-cobalt magnetic poles are arranged at two sides of the corresponding neodymium-iron-boron magnetic poles.

The invention relates to a mixed magnetic circuit inductor which comprises a magnetic core and a coil. The magnetic core comprises a first square-shaped magnetic core and a second square-shaped magnetic core which is located in the first magnetic core. Two end faces of the second magnetic core are respectively connected with a connecting face corresponding to the inner side wall of the first magnetic core, and the coil is wound on the second magnetic core. The first magnetic core is made of metal soft magnetism powder, and the magnetic permeability is less than 500H / m. The second magnetic core is made of ferrite, and the magnetic permeability is larger than 1500H / m. The ratio of the length, perpendicular to the direction of the second magnetic core, of the first magnetic core to the width, parallel to the direction of the second magnetic core, of the first magnetic core is larger than 1.2.

The invention discloses a flux increase type built-in U type adjustable magnetic flux motor, and belongs to the field of permanent magnet motors. The flux increase type built-in U type adjustable magnetic flux motor aims at solving the problem that when a flux weakening type adjustable magnetic flux motor runs at high loads, uncontrollable demagnetization of an aluminum-nickel-cobalt permanent magnet is prone to happen. The flux increase type built-in U type adjustable magnetic flux motor comprises a stator core, an armature winding, a rotor core, a rotary shaft, p U type permanent magnet grooves, p neodymium iron boron magnetic poles, 2p aluminum-nickel-cobalt magnetic poles and p quadrature axis magnetic barriers, and p is an even number; the p U type permanent magnet grooves and the p quadrature axis magnetic barriers are alternately and evenly arranged on the rotor core in the circumferential direction of the motor, the U type permanent magnet grooves and the quadrature axis magnetic barriers penetrate through the whole rotor core in the axial direction, and openings of the U type permanent magnet grooves face the stator core; each U type permanent magnet groove is formed in the mode that two U type branch rectangular grooves are communicated with one bottom rectangular groove, one neodymium iron boron magnetic pole and two aluminum-nickel-cobalt magnetic poles are arranged in each U type permanent magnet groove, the neodymium iron boron magnetic poles are arranged in the bottom rectangular grooves of the U type permanent magnet grooves, and the aluminum-nickel-cobalt magnetic poles are arranged in the U type branch rectangular grooves in the two sides of the U type permanent magnet grooves.

The invention discloses a direct-current relay for resisting a short-circuit current. The direct-current relay for resisting the short-circuit current comprises two static contact leading-out ends, amovable spring piece and a pushing rod part; an upper magnetizer is arranged above a preset position of the movable spring piece, and a lower magnetizer capable of moving along with the movable springpiece is arranged below the preset position of the movable spring piece; and at least one through hole is formed in the movable spring piece at the preset position, so that the upper magnetizer and the lower magnetizer can be close to or in mutual contact with each other through the through hole, and at least two independent magnetic conductive circuits are formed on the width of the movable spring piece by the upper magnetizer and the lower magnetizer. According to the direct-current relay, the magnetic pole surfaces are added at the positions of the corresponding through holes of the respective magnetic conductive circuits, so that when the moving spring piece suffers from a fault large current, suction force in the pressure direction of the contact is generated, and the electric repulsive force generated by the fault current between the movable spring piece and the static contact leading-out ends is resisted, and therefore the relay has the characteristics of high magnetic efficiency and difficulty in magnetic circuit saturation.

An image sensor, and a reading circuit and a reading method of an amorphous silicon TFT pixel unit are provided. The amorphous silicon TFT pixel unit comprises an amorphous silicon TFT and a photoelectric diode. The reading circuit of the amorphous silicon TFT pixel unit comprises an operational amplifier, a first capacitor, a first switch, a second switch, a third switch, and a sampling and holding unit. According to the image sensor, and the reading circuit and the reading method of the amorphous silicon TFT pixel unit provided by the invention, the signal-to-noise ratio of the output signal of the reading circuit of the amorphous silicon TFT pixel unit is improved.

The invention discloses a current transformer which comprises an iron core, primary winding and secondary winding. At least one air gap arranged along a magnetic field line cutting direction is arranged on the iron core, and the sectional area of the iron core is 0.5cm<2> to 3.5cm<2>. The number of turns of the primary winding is 1 turn to 25 turns, and the sectional area of coils of the primary winding is 0.5mm<2> to 4mm<2>. The number of turns of the secondary winding is 10001 turns to 30000 turns, and the diameter range of the coils of the secondary winding is 0.05mm to 0.3mm. The current transformer has the advantages that when a primary current rises to 20 times to 6o times of a rated current, the current transformer can accurately transform direct current components with decay time constant of 20ms to 200ms, and can truly reflect a nonperiodic decay state, output waveforms of the current transformer are difficult to be saturate and are not distorted, and the trailing phenomenon generated by secondary waveforms after fault removal can be further eliminated.

The invention discloses a preparation method of a soluble inorganic phosphorus and arsenic adsorption membrane. According to the preparation method of the adsorption membrane, cerium oxide nanoparticles are dispersed in an acrylamide solution, and acrylamide polymerization reaction is carried out to fix the nanoparticles uniformly in polyacrylamide gel. The preparation steps include: dispersing cerium oxide nanoparticles into the acrylamide solution, adding ammonium persulfate and tetramethylethylenediamine, mixing the substances evenly, then injecting the mixture into a two-glass plate gap clamping a U-shaped sheet, conducting horizontal placement at room temperature for 30min, then opening the glass plates and taking out a gel membrane, soaking the gel membrane in deionized water for 24hto remove unreacted reagent, cutting the gel membrane to a circle with a diameter of 2.5cm to make the adsorption membrane. The preparation method of the adsorption membrane provided by the inventionhas the characteristics of simple operation and good repeatability. The adsorption membrane has large adsorption capacity and good selectivity on soluble inorganic phosphorus and arsenic, can be preserved for a long time in a solution, and has broad application prospect in the fields of analytical chemistry and environmental analysis.

The invention discloses a method and device for indirectly measuring large DC based on AC detection. The method comprises the following steps: 1) acquiring multichannel current signals of rectifier transformer valve sides by adopting AC sensors; 2) synchronously sampling the current signals acquired by the AC sensors through adopting acquiring units; 3) transferring the sampled data to a PC machine via interfaces; and 4) analyzing the received data in real time by adopting the PC machine to compute the measured DC. The method and the device have the following beneficial effects: the structure is simple; the volume is small; the measuring process is not affected by the DC high-intensity magnetic fields; the operation is convenient; the measuring accuracy is high; tens of thousands of amperes of large DC can be accurately measured; and the problems of DC measurement, AC harmonic analysis and energy consumption analysis and efficiency calculation of rectifier cabinets and converter systems in the industries such as electrolysis chemical industry and the like are effectively solved.