326results about How to "No hysteresis" patented technology

There is provided a honeycomb structure where a catalyst is loaded on surfaces of inner pores of the surface layer and on a surface of the surface layer; a relation between a catalyst area proportion A of the catalyst to a gap area proportion B of a gap in a cross-section of the surface layer on the inlet side is 1%<A / B<90%; and a relation between an average catalyst area proportion, A1, from the surface to a point having a depth of one third of the thickness of the surface layer including the surface of the surface layer on the inlet side and a catalyst area proportion A2 in a central portion of the surface layer is A1 / A2>1.5.

The invention discloses an optical voltage transformer which is composed of a light source, a coupler, a polarizer, a phase modulator, a polarization delay optical cable, a collimating lens, a faraday rotary mirror, an electro-optical sensing unit, a photoelectric detector and a signal processing module, wherein the electro-optical sensing unit is composed of a bismuth germinate and an A and a B electrodes which are respectively installed on an upper and a lower panels of the bismuth germinate. The invention adopts the technical proposal that an electric field leads to the change of the refractive index of the sensing bismuth germinate in the electro-optical sensing unit, the phase difference of two cross-line polarized lights passing through the bismuth germinate is changed due to the Pockels effect, and the magnitude of the electric field can be indirectly measured by measuring two coherent lights.

The invention relates to a phase shift soft switch high frequency isolation photovoltaic grid-connected inverter which comprises a main circuit, a DSP control circuit, an ARM control circuit, and an auxiliary switch power supply circuit. The invention firstly provides a full digitalization control photovoltaic grid-connected generating system, wherein a high frequency full bridge phase shift circuit combined with a high and low frequency full bridge inverter circuit is main circuit structure, and high speed embedded digital signal processor DSPTMS320F2808 is a core. Maximal power point tracking of solar cell panel output power and isolation of photovoltaic direct current and electrical network alternating current are realized, software realizes phase-locked loop control, perfect grid-connected and islanding protection functions are provided, and the whole system can operate safely and reliably.

The invention discloses a method for synthesizing a composite molecular sieve by a microwave method and catalytic performance application thereof. In the method for preparing the composite molecular sieve by the microwave method, kaolin is taken as a raw material, inorganic silicate is taken as an additional silicon source, and the prepared composite molecular sieve is applied to the alkylation reaction of phenol and tertiary butanol. The method comprises the following steps of: adding a certain amount of sodium silicate into the kaolin serving as the raw material to synthesize a Y type molecular sieve precursor; and preparing a composite molecular sieve Y / MCM-41 by the microwave method by using hexadecyl trimethyl ammonium bromide serving as a template. The synthesized molecular sieve has two pore structures, namely micropores and mesopores; the specific surface area of a sample is more than 550 m<2> / g; the average pore size is roughly 2.7 nm; and the sample has a regular and ordered hexagonal pore structure. The synthesized molecular sieve has good catalytic effect on the alkylation reaction of the phenol and the tertiary butanol, and particularly the selectivity of 4-tertiary butyl phenol is up to 86.3 percent.

The invention provides a method for preparing fluorinated graphene through a microwave hydrothermal method. The fluorinated graphene is prepared by employing the microwave hydrothermal method and is rapidly heated by utilizing the change of the electric field and magnetic field in the space, the low-temperature (150-200 DEG C) temperature is realized, the reaction time (30-60 minutes) is greatly shortened, the energy consumption is reduced, and the preparation efficiency is improved. The adopted preparation method does not have temperature gradient in the reaction process, a hysteresis effect is avoided, and the reaction process is easy to control and fewer in influence factors; and the prepared fluorinated graphene is uniform in fluorine doping and high in experimental repeatability. The process conditions such as raw material ratio, reaction temperature and reaction time are adjusted, and the fluorinated graphene of different fluorine contents can be prepared. The prepared fluorinated graphene is high in yield, and the yield is up to 90-95 percent. The preparation method is easily popularized and applied.

The invention provides a real-time wide-scene monitoring synthesis method for a cloud data center room, which synthesizes a monitoring video into a wide-scene wide-angle video in real time by arranging two common cameras in a cloud data center room in the following steps: (1) carrying out a camera calibration and correction method; (2) matching key frames; and (3) carrying out a fusion method and a real-time wide-scene video synthesis method. The camera calibration and correction method (1) is characterized in that the inner parameter, the outer parameter and the distortion parameter of the camera are calibrated and corrected with a common checkerboard method in the computer visual domain to favorably correct the distortion of the camera; and a result is more scientific, objective and real; in the camera calibration and correction method which is the first step of the method, a calibration algorithm based on a plurality of free planes of Open computer vision (CV) is adopted, i.e. a 7*7 checkerboard image is held by hands, and the length and the width of each check are both 2cm; the checkerboard image is translated and rotated in front of a pickup camera to obtain images of different directions; and when enough images (at least 10 pieces) are collected, the inner parameter, the outer parameter and the distortion parameter of the pickup camera are obtained by a pickup camera calibration function of the Open CV so as to correct the frame image.

The invention relates to a method for preparing a TiO2 / PS / Fe3O4 magnetic nanoparticle photocatalyst, comprising the following steps of: (1) preparing oleic acid modified Fe3O4 nanoparticles; (2) preparing an aqueous-phase magnetic fluid; (3) preparing styrene miniemulsion; (4) preparing magnetic polystyrene beads PS / Fe3O; and (5) preparing the magnetic photocatalyst TiO2 / PS / Fe3O4, which specifically comprises the following steps of: mixing absolute ethyl alcohol with tetra-n-butyl titanate, and performing magnetic stirring to form a solution A; adding the magnetic polystyrene beads PS / Fe3O to de-ionized water and performing ultrasonic treatment to form a solution B; under magnetic stirring, adding the solution A to the solution B, thereby obtaining sol after 30-40 min, wherein TiO2 covers the PS / Fe3O at the moment; after condensing and refluxing the sol in a water bath, filtering the sol to obtain the TiO2 / PS / Fe3O4, washing the TiO2 / PS / Fe3O4 by using ethanol, filtering, washing by using distilled water and filtering, thus obtaining a solid; and drying the solid until the weight thereof is constant, thereby obtaining the magnetic photocatalyst TiO2 / PS / Fe3O4 with the polystyrene PS as an isolating layer, the Fe3O4 as a magnetic core and the TiO2 as a shell. The product obtained by using the method is low in energy consumption, high in catalytic activity and recyclable.

The invention discloses a two-stage micro-displacement amplification mechanism which is characterized in that two triangle displacement zooms are arranged and respectively are a first stage triangle displacement zoom and a second stage triangle displacement zoom, each triangle displacement zoom comprises four sloping sides; the input end of the first stage triangle displacement zoom is linked with a driven element; the output end of the first stage triangle displacement zoom is linked with the input end of the second stage triangle displacement zoom. In the optimized scheme, flexibility hinges are respectively arranged at the joint of the displacement input end and the four sloping sides of the triangle displacement zoom and the joint of the displacement output end and the four sloping sides; the displacement input end of each triangle displacement zoom is provided with a positioning step. Two-stage micro-displacement amplification mechanism provided with by the invention has the advantages of zero friction, zero clearance and zero delay, and is easy to maintenance and service; the mechanism avoids oversized elastic counterforce caused by structural distortion, ensures direction stabilization of the displacement output; the displacement enlargement ratio of the two-stage displacement amplification is greatly improved, and the mechanism has very high practicability.

The invention discloses a preparation method for a nano-flake SnS2 sodium-ion battery negative electrode material with good rate capability, comprises: 1) preparing an Sn source solution A with the concentration of 0.5-1.2 mol / L, regulating the pH of the solution A to be 1-9; and preparing an S source solution B with the concentration of 0.1-2.4 mol / L; 2) mixing the solution A and the solution B at an element molar ratio of nSn: nS being equal to (1.0-2.5): (2.0-4.3), and uniformly stirring to form a solution D; 3) putting the solution D into a homogenous phase hydrothermal reaction kettle for performing a homogenous phase hydrothermal reaction; and 4), cooling the reaction kettle, then centrifuging, washing, separating and drying to obtain the nano-flake SnS2 sodium-ion battery negative electrode material, wherein under 100 mA / g current density, the initial discharge capacity of the negative electrode material reaches 745 mAh / g; and after circulating for 100 times, the capacity is kept at 560 mAh / g.

The invention relates to the lossless compression method of digital images. Whether a section of pixels is the continuous same or the discontinuous same is examined according to the adjacent pixels in the spacial position in the image and is shown by flag bits. And the flag bits and step sizes are indicated by indicating bytes. If n continuous pixels are the same, one of the pointing byte is in front of the specific color value of one of the pixels; if n continuous pixels are different, the pointing byte is in front of the specific color value of the n pixels. The invention also provides the lossless compression device, the resolution method and the encoder of the digital images based on the method. The lossless compression method of the digital image has the advantages of high compression rate, fast decompression speed, storage space saving performance and good real-time performance.

The invention discloses a control system for overcoming the low voltage ride through. The control system comprises a photovoltaic cell array, a three-phase inverter, a power grid and a controller, the three-phase inverter comprises a power switch circuit and a filtering circuit, the power switch circuit and the filtering circuit are sequentially connected between the photovoltaic cell array and the power grid in series, and the signal input end of the controller is respectively and electrically connected with the output end of the photovoltaic cell array, the output end of the power switch circuit and the output end of the filtering circuit to collect current or voltage signals. The signal output end of the controller is electrically connected with the switch tube signal end of the power switch circuit to conduct repetitive control, PI adjustment and net side voltage front feed on the collected current or voltage signals to output pulse width modulation signals for controlling communication of a switch tube, the current can smoothly pass through the photovoltaic inverter when low voltage (including zero voltage) faults of the power grid occur, and the synchronization current is output to the maximum degree.

Provided is a dual mechanical port magnetic conductance harmonic type electromagnetic gear composite permanent magnet motor which can be widely applied to industrial transmission fields such as wind power generation, electric automobiles, ship driving and server driving. The electromagnetic gear composite permanent magnet motor is characterized is that main transmission components of the electromagnetic gear composite permanent magnet motor consists of a stator formed of a stator iron core (9) and a stator winding (8) having 2ps poles, a permanent rotor formed of a rotor iron core (17) equipped with 2pr rotor permanent magnets (18) and an output shaft (16), and a salient pole magnetic conductance wave rotor (6) having Zb salient poles, wherein a numerical difference between the number of pole-pairs ps and pr is relatively small; and the stator, the permanent magnet rotor and the salient pole magnetic conductance wave rotor (6) are coaxially disposed, are mutually coupled through a radial air-gap magnetic field, and are mutually coupled in a salient pole straight axis area of the high-speed rotating salient pole magnetic conductance wave rotor (6) by using a principle of heteropolarity magnetic field attraction with a small pole difference so as to drive the permanent magnet rotor with a small pole difference to rotate at a low speed. Therefore, power speed changed and torque conversion controlled drive with no mechanical contact and no friction is realized.

The present invention provides a shake correction device which can not generate the hysteresis phenomenon and can suppress unnecessary resonance and improve endurance with respect to drop impact. In this shake correction device, the eddy current induction plate 16a of +Z side is opposite to and has a gap with the surface (14a) of the +Z side of the permanent magnet (14) which is arranged to wind around the optical axis at an interval of 90 degree in the Z direction, the eddy current induction plate 16b of radial direction is opposite to and has a space with the surface (14b) of the outside in the radial direction, and the eddy current induction plate 16c of the periphery direction is opposite to and has a gap with the surface (14c) in the periphery direction.

The invention discloses a system and a method for teaching, training and competing defending and counterattacking techniques and tactics of football shooting and counter-shooting. The system is characterized by comprising a shooting training device, a football counting device, an identity recognition device, a position recognition device, a photographing device, an intelligent information analysis center and equipment and a receiving terminal, each of the shooting training device and the football counting device is provided with a counter, the identity recognition device, the position recognition device, the photographing device and all counters are in signal connection with the the intelligent information analysis center and equipment through a communication passage, and the intelligent information analysis center and equipment is in signal connection with the receiving terminal through a communication passage. The method adopting the system has the advantages of intelligentization, high efficiency and full process.

The invention relates to a organic field effect transistor device comprising: an organic semiconductor layer; a source electrode arranged in electronic contact with the said organic semiconductor; a drain electrode arranged in electronic contact with the said organic semiconductor; a gate electrode; an electrolyte layer arranged between said gate electrode and said organic semiconductor layer; wherein the organic semiconductor layer comprises a semiconducting polymeric material comprising one or more blocks of conjugated polymer combined with one or more blocks of copolymer; preferably an amphiphilic copolymer. Also a method of producing the device, and a polyanionic polymer is provided by the invention.

The invention provides a method for preparing a nitrogen-doped bismuth tungstate powder photocatalyst through a microwave hydrothermal method. The method comprises the following steps of: adding de-ionized water into bismuth nitrate pentahydrate and sodium tungstate dihydrate serving as raw materials and urea serving as an N source, stirring to uniformly mix the raw materials, stopping the stirring and producing white precipitate; placing in an ultrasonic instrument to perform ultrasonic treatment for 10-30 minutes; performing complete precipitation reaction to obtain precursor of microwave hydrothermal reaction; transferring the precursor into a reaction kettle; reacting by using the microwave hydrothermal method for 30-90 minutes at 160-200 DEG C; and taking out of the reaction kettle, collecting the precipitate, cleaning and drying. The method has the advantages of low reaction temperature of about 180 DEG C and short reaction time of probability 50-60 minutes; and the prepared powder has high reaction activity and low energy consumption and is environmentally-friendly.

The invention relates to an electromagnetic controllable mechanical brake parking device which comprises action arms, an action arm installation seat, cylindrical compression springs, electromagnetic iron components and abrasion pieces. Two action arms are respectively connected on an upper end and a lower end of the action arm installation seat in a rotation mode, the cylindrical compression springs are arranged between the two action arms, two ends of each cylindrical compression spring are connected with the action arms on the upper side and the lower side respectively, the electromagnetic iron components are arranged inside the cylindrical compression springs and connected with the action arms on the upper side and the lower side, and two abrasion pieces are respectively arranged at the other end of each action arm. Compared with the prior art, electricity amount of the electromagnetic iron components is controlled to control frictional force among the abrasion pieces and a steel rail so as to achieve braking or parking of a vehicle, the abrasion pieces are compressed on the steel rail, most thermal load is born by the steel rail, the position of the vehicle is continuously moved, heat generated by the braking is rapidly dissipated on the steel rail, and the electromagnetic controllable mechanical brake parking device is suitable for being used for continuously-implemented brake of the vehicle on long-distance downhill.

The invention relates to laboratory waste water treatment, in particular to a laboratory waste water treatment method and a device. In the method, laboratory waste water is subject to internal electrolysis, micro electrolysis and biosorption in sequence; aeration is carried out along with treatment; sludge produced in waste water treatment is dried, and the drying treatment is characterized in that gas produced in the aeration process is used for drying the sludge. The device comprises an electric control system and a waste water treatment unit, wherein, the waste water treatment unit comprises an inner electrolytic cell, a micro electrolytic cell, a biosorption cell and a desilter which are sequentially connected from front to back; the inner electrolytic cell, the micro electrolytic celland the biosorption cell are all provided with an aeration system; in addition, the device of the invention is also provided with a sludge filtering cell for treating sludge. The method and the device of the invention can be widely applied in treating waste water in various organic chemical engineering laboratories.

The invention provides a path navigation method and a path navigation apparatus used for solving problems of high navigation error rate or lagging of an existing path navigation method when a vehicle travels at an intersection can be solved. The method comprises the steps that: whether the distance between the vehicle and the intersection ahead reaches a preset distance is monitored; when the distance between the vehicle and the intersection ahead reaches a preset distance, guide arrows passed by the vehicle when the vehicle travels towards the intersection ahead are monitored; whether the vehicle crosses a stop line of the intersection ahead is monitored; when the vehicle crosses a stop line of the intersection ahead, whether a valid guide arrow exists in monitored guide arrows is determined; when a valid guide arrow exists in monitored guide arrows, an expected direction of the vehicle is determined according to the last monitored valid guide arrow. With the technical scheme provided by the invention, intersection path navigation accuracy is improved, lagging is prevented, and better matching effect is provided.

The invention relates to a tunnel surrounding rock disaster emergency plan system based on virtual reality. A monitoring terminal is arranged in a tunnel; thermal infrared temperature measurement probes, microseism sensors and acoustic emission sensors are fixedly mounted in the tunnel. The thermal infrared temperature measurement probes, the microseism sensors and the acoustic emission sensors are connected with the monitoring terminal through wireless devices. The monitoring terminal is connected with a real-time three-dimensional computer out of a mine through a wired optical cable. The real-time three-dimensional computer is connected with a VR terminal. The invention also discloses a tunnel surrounding rock disaster emergency plan method based on virtual reality. The system and the method have the advantages that staff can view the top plate surrounding rock condition of any place and any time within a monitoring area in real time whenever and wherever possible; observers no longer needs to enter the mine; the system and the method relate to multisource physicochemical information of tunnel surrounding rocks; the information amount is high; the data is fed back timely; and the accurate information for forecasting a surrounding rock disaster can be provided.

The invention provides a small-range magnetic conductance harmonic type magnetic gear pair of a radial magnetic field. The magnetic gear pair can be widely applied to such industrial transmission fields as wind power generation, electric automobiles, ship drive and the like. The magnetic gear pair is characterized in that the magnetic gear pair comprises a permanently magnetic stator consisting of a stator core 6 and 2ps stator permanent magnets 7, a permanently magnetic rotor provided with 2pr rotor permanent magnets 8 and a salient pole type permeance wave rotor 5 with Zb salient pole waves; the numbers of pole pairs ps and pr are small in difference, and the pole pairs ps and pr are relatively prime; the permanently magnetic stator, the permanently magnetic rotor and the salient pole type permeance wave rotor 5 are coaxially mounted, and coupled with each other by a radial air-gap field; the permanently magnetic stator, and the permanently magnetic rotor and the salient pole type permeance wave rotor 5 are coupled in a salient pole direct-axis area of the salient pole type permeance wave rotor 5 which is rotated at the high speed based on the principle of attracting of a small-range heteropolarity magnetic field, so that the small-range magnetic gear pair is driven to rotate at the low speed, and the power transmission under the variable speed and torque can be achieved without mechanical touch and friction.

The invention discloses a data indexing method based on string suffixes. The method comprises an index creation step and a data indexing step. The index creation step comprises the substeps that S1, data is written, metadata and row ID are extracted, and the string suffixes are added; S2, an index is created; and S3, transaction judgment is performed, wherein a data writing transaction is judged, if writing succeeds, a transaction lock is opened, and if writing fails, logic deletion is performed, and the data is recovered. The data indexing step comprises the substeps that S01, index matching is performed; S02, an index pointer list is acquired, wherein a coding value of the index is quickly positioned in a B+ tree, and leaf nodes of the value form the index pointer list containing keywords of the index; and S03, the data is read, and an index result is found according to an index pointer array. According to the method, starting from a language system of a non-Latin language family, a string suffix sorting algorithm and a B+ tree algorithm are utilized to construct the index with characters being units, and problems concerning efficiency and accuracy of fuzzy query are solved.

The present invention is directed to a magnetic sensor using a spin transfer torque device, including a spin transfer torque device configured such that the magnetization direction thereof is varied by current, a bipolar pulse source configured to apply bipolar pulses to the spin transfer torque device in order to control the coercive field and sensitivity of the spin transfer torque device, and a signal processing unit configured to calculate magnetic susceptibility or magnetic resistance by counting the parallel (P) or anti-parallel (AP) states of the spin transfer torque device in response to the applied bipolar pulses.

The invention discloses a method for realizing remote security patrol by using AR. The method comprises the following steps: the AR glasses is connected a remote signal of a remote terminal control system through a wireless communication module, so that an image observed by a patrol personnel from the AR glasses can be transmitted to the remote terminal control system out of the patrol region in real time, and the support personnel can observe the patrol region observed by the patrol personnel in an immersive way even in an office; due to the augmented reality effect of the AR glasses, the patrol personnel in the patrol region can effectively discover the blind point unnoticed by the patrol personnel under the help of the AR glasses, thereby greatly improving the efficiency of the patrol; the patrol personnel can fast mark out personnel and the position needing to be detected and surveyed through the remote assistance so as to be observed and surveyed by the support personnel at the background, and the support personnel can fast mark out the position needing to be further surveyed by the patrol personnel or the personnel needing to be queried by the patrol personnel, thereby enabling the patrol personnel to pay close attention to the position and the personnel, and the patrol efficiency is grealty improved.

The invention belongs to the technical field of magnetic particle preparation, and discloses a method for preparing biocompatible coating controllable core-shell type magnetic particles. The method comprises the following steps: anchoring methylacrylic acid to the Fe3O4 particle surface through a simple coordination reaction between methylacrylic acid MAA and unsaturated iron ions on the Fe3O4 nano-particle surface to form a polymerizable structure Fe3O4-MAA; adding konjac glucomannan, methylacrylic acid, a crosslinking agent, initiator and template, directly polymerizing through a graft copolymerization method to form coating controllable core-shell type magnetic particles with biocompatibility. The method is simple in process and low in cost, and the product can be used in carriers of target magnetic field drug release materials, magnetic resonance imaging contrast agents, magnetic molecularly imprinted polymer and the like.

The invention provides a bionic fishtail underwater propeller and relates to the technical field of underwater robots. The bionic fishtail underwater propeller comprises a swing mechanism, a driving mechanism, a transmission mechanism and a shell, wherein the swing mechanism comprises an elastic sheet and a rigid tail fin fixed at a tail end of the elastic sheet; the driving mechanism comprises a steering engine; the transmission mechanism comprises a winder and a connecting line, the two ends of the connecting line are fixedly connected with the two swinging sides of the elastic piece respectively, and the winder is fixedly connected with the connecting line; and the shell comprises a head shell body and a tail elastic shell body. According to the bionic fishtail underwater propeller, the steering engine drives the winder to rotate in two directions, the winder drives the connecting line to drive the elastic piece to swing left and right, the swinging process is not limited by frequency, the hysteresis effect does not exist, fish body waves are bent and continuous, the bionic effect in water is good, the bionic fishtail underwater propeller has advantages of being simple in structure, easy to control, good in flexibility and high in bionic degree.

A method of predicting the discharge condition of an electric spark processing belongs to the field of the electric sparking processing and relates to the method of predicting the discharge condition of the electric spark processing. The method of predicting the discharge condition of the electric spark processing first adopts the progressive mapping test method of the discharge condition to treat a real-time interval discharging signal that is collected in the processing; after treated, discharging condition succession is used as an system input, the unit of which is cyclical analysis; the mathematical model and the prediction method of the discharging condition based on local-wave resolution are used to do calculation, and the obtained prediction discharging condition succession of the electric spark is used as system output; then the normative approach method of output domain is adopted to treat the prediction discharging condition succession which is in the output domain of the actual discharging condition succession; and finally, fit criterion and descriminant technique are used for calculating the prediction precision of the discharging condition of the electric spark. The prediction method provided by the invention has wide application, high prediction precision and good freshness, which also has not hysteretic property.

The invention discloses the synthesis of poly lactic acid by microwave radiation melt polycondensation method which comprises, (1) placing L-lactic acid on auxiliary reaction medium, increasing the system vacuum from 0.050-0.070 Mpa to 0.080-0.099Mpa, microwave radiating 30-50 min, obtaining prepolymer (OLLA), (2) charging catalyst into the prepolymer, microwave radiating 2-5 min under normal pressure, (3) under the condition of vacuum 0.085-0.1Mpa, microwave power 500-550W, radiating 25-50min, thus obtaining polylactic acid.