157results about How to "Overcoming loss" patented technology

The invention discloses a novel rotating travelling-wave ultrasonic motor. The ultrasonic motor comprises the following main parts: two stators, a rotor, a pedestal, a friction pad, a check ring, a bearing and the like. The two stators which are in a same shape are symmetrically arranged and compact on two end faces of the rotor. Working faces of the two stators can be parallelly contacted with a surface of the rotor so that a contact surface of the stators and the rotor bears stress evenly. In a current rotating travelling-wave ultrasonic motor based on a single stator structure, radial contact between the stator and the rotor is nonuniform, a contact scope is small, and radial sliding friction losses and other defect are existed in the stator and the rotor. By using the ultrasonic motor of the invention, the above defects can be overcome. A maximum output torque and an efficiency of the rotating travelling-wave ultrasonic motor can be increased and a service life of the rotating travelling-wave ultrasonic motor can be prolonged.

A system for realizing operation system backup comprises a system insulation module and a backup control module. And a relative method comprises that 1, the backup control module sends the command for building a new sub operation system module to the insulation module, 2, the system insulation module based on the command, the mother operation system and/or prior sub operation system module executes the operation to build the new sub operation system module, 3, the backup control module stores the backup relation information relative to the new sub operation system. The invention can start backup operation system without interrupting user operation, realize real-time backup of user data, and quickly repair the operation system accident.

The invention discloses a manganese dioxide modified biochar composite material as well as a preparation method and an application thereof. The composite material is prepared from manganese dioxide and biochar by loading generated manganese dioxide on biochar through the neutralization reaction of permanganate and manganese in divalent manganese salt. The manganese dioxide modified composite material has the advantages of high adsorption capacity for heavy metal lead or cadmium, obvious adsorption effect, low preparation cost and the like, and is an ideal heavy metal wastewater adsorbent; thepreparation method of the composite material has the advantages of simple process, cheap raw materials, sufficiently used raw materials, low production cost and the like. The manganese dioxide modified composite material can be used for treating heavy metal wastewater, and has the advantages of high adsorption capacity for heavy metals, high adsorption efficiency, low toxicity to organisms in theenvironment and the like, and can be produced and applied on a large scale.

The invention discloses an alkyne selective hydrogenation catalyst carrier and a preparation method thereof; the hydrogenation catalyst carrier is obtained by well mixing and compounding alumina with one or two of SiC and talcum, and a catalyst containing an active ingredient of palladium is prepared. The catalyst can also contain co-catalytic ingredients of Ag, Mn, Bi, Mo, W, Cu, Zn, alkali metal, alkaline earth metal, and rare earth elements. The catalyst carrier has low raw material cost, and the obtained catalyst has high selective hydrogenation activity and good selectivity.

The invention discloses a quasi-resonance converter synchronous rectification circuit which comprises a power transformer, a secondary power switch circuit, a rectification tube control circuit and a follow current tube control circuit. Detection to the power transformer is used for achieving a no-voltage connecting function and a no-voltage disconnecting function on a rectification tube in the secondary power switch circuit. The quasi-resonance converter synchronous rectification circuit aims at solving the problem that a traditional quasi-resonance converter using diode rectification is large in connecting loss and low in efficiency when used in a large current output applying occasion. The quasi-resonance converter synchronous rectification circuit can achieve no-voltage connecting and no-voltage disconnecting of the rectification tube and a follow current tube under the conditions of load changes, input voltage changes, temperature changes and the like, has the self-adaptation soft switching function, is high in conversion efficiency, contributes to high frequency and miniaturization of a converter, and can be widely applied to manufacturing power sources for the industry, the aviation and the communication.

The invention relates to a method for measuring a loss of a magnetic element. The method comprises the steps that a power converter serves as a test circuit; input power of the test circuit is measured under a working condition; two end points of a magnetic element in the test circuit are selected; the measured magnetic element is connected in parallel with the two end points; then input power of the test circuit after the measured magnetic element is connected in parallel is measured; and a difference of the input power of the test circuit before and after the measured magnetic element is connected in parallel is the loss of the measured magnetic element under the working condition. The method improves the measurement accuracy of the loss of the magnetic element; the measurement is convenient and simple; and the cost is low.

A switch MOS (metal oxide semiconductor) bootstrap charge circuit applicable to gate drive of high-speed GaN power devices belongs to the technical field of electronic circuitry and comprises an inverter chain, a diode, a charge pump capacitor and a switch tube; the output end of the inverter chain is connected with a cathode of the diode through the charge pump capacitor; an anode of the diode isconnected with power supply voltage; a gate of the switch tube is connected with the cathode of the diode, and a drain of the switch tube is used as an output end of the switch MOS bootstrap charge circuit. The switch MOS bootstrap charge circuit also comprises a level shift module, a constant-current source module and a switch module; the input end of the level shift module is used as the inputend of the switch MOS bootstrap charge circuit, and the output end of the level shift module is connected with the input end of the inverter chain; the constant-current source module is connected between the gate and ground of the switch tube; the switch module is connected between the source of the switch tube and the power supply voltage. The problem can be solved that a traditional switch MOS bootstrap circuit experiences mistaken opening of a switch tube and overcharging of a bootstrap capacitor.

The invention discloses an M-contained multifunctional metal oxide modified high-voltage lithium cobalt oxide positive electrode powder material and a preparation method therefor. The general formula of the positive electrode powder material is LiaCo1-x-yM'xMyO2, and the positive electrode powder material adopts a core-shell structure; the exterior of the inner core of the positive electrode material is coated with an inert protection layer; the inert protection layer at least contains an oxide containing M, or a corresponding composite oxide containing M and M'; the preparation method comprises the steps of mixing a battery-level lithium source, a cobalt source and an additive containing M and M' based on certain proportions; performing constant-temperature sintering on the obtained mixture; and performing powder processing on the obtained sintered product to obtain the high-voltage lithium cobalt oxide positive electrode powder material. The positive electrode powder material prepared in the invention is high in energy density and excellent in cycling performance and safety performance under high voltages.

The invention discloses a super-smooth self-cleaning coating and a preparation method thereof. The preparation method of the coating includes the following steps that under protection of nitrogen gas, tetraethyl orthosilicate, silica sol, a silane coupling agent and solvent are mixed to be uniform, a catalyst is added, a hydrolytic condensation reaction is conducted for 1-5 hours at the temperature of 10-15 DEG C, a sol-shaped coating material is prepared, the coating material is sprayed on the surface of a base material, thermal treatment is conducted, and an organic-inorganic hybrid coating is obtained; the coating is soaked in silicone oil and then taken out to remove redundant silicone oil, and the super-smooth self-cleaning coating is obtained; the lag angle of a water drop on the coating is smaller than 5 degrees, anti-fouling self-cleaning performance is achieved, and the super-smooth self-cleaning coating can be used for the fields of ocean, dirt prevention of medical instruments, self-cleaning materials and the like. The super-smooth self-cleaning coating has the advantages of being transparent, good in stability, long in service life, simple in process, easy to operate and convenient to apply.

The invention relates to a method for coupling and aligning an optical fiber and an integrated chip and a coupling and aligning module thereof. The coupling and aligning module comprises an optical fiber fixing block and the integrated chip, the optical fiber fixing block and the integrated chip are provided with V-shaped grooves for containing the optical fiber, and the distance and the size of the V-shaped groove in the optical fiber fixing block are identical with those of the V-shaped groove in the integrated chip. The V-shaped groove in the optical fiber fixing block and the V-shaped groove in the integrated chip are staggered by a certain distance in the height direction, and/or are staggered by a certain distance in the longitudinal direction of containing the optical fiber and form a certain included angle, so that the optical fiber extending out of the V-shaped groove of the optical fiber fixing block lands into the V-shaped groove of the integrated chip in a slight curving state, and the optical fiber is completely fixed through matching glue with certain bonding strength. According to the method for coupling and aligning the optical fiber and the integrated chip and the coupling and aligning module thereof, the curving stress of the optical fiber is used for solving the problem that in the waveguide coupling process of the optical fiber and the integrated chip, coupling insertion losses are large due to the fact that the optical fiber floats above the V-shaped grooves.

The invention relates to a method for de-noising of a balanced morphology filter image optimized by a particle swarm, comprising the following steps of: firstly, defining an unit structure element of a zero square matrix, a balanced erosion operation and a balanced expansion operation; secondly, updating speeds and positions of particles by a particle swarm optimization technology after a peak signal-to-noise ratio is taken as a cost function, so as to enable a transformed value of the global optimum particle position to be as the size of the unit structure element; and finally, performing the balanced erosion operation on an image by the optimized unit structure element, then performing the balanced expansion operation, and outputting the image after the balanced expansion operation. The method for de-noising of the balanced morphology filter image optimized by the particle swarm, disclosed by the invention, overcomes the inherent shortages in an extreme value operation used by the present morphology, can adaptively obtain the size of the unit structure element according to the degree of pollution on the image caused by noise and effectively remove pulse noise in the image, as well as can be widely used in the fields of image processing, licence plate information extracting, edge detecting etc.

The invention provides a device and method for automatically assembling a bullet chain, and relates to bullet chain assembling devices. The device is provided with a bullet sequencing device, a feeding device of a bullet chain assembly mechanism, and an automatic bullet chaining device; the bullet sequencing device is provided with a stainless steel bucket, a scattered bullet container, bullet slide rails, a bullet slide groove and a machine frame; the feeding device is provided with guide plates, partition plates, a guide plate base, a bullet pressing guide groove, a baffle, a bullet chain moving wheel, an auxiliary shaft base, a main shaft, a bullet chain guide wheel and a machine frame; the automatic bullet chaining device is provided with a transmission motor, a motor base, a machine frame, a main rotating shaft, bearing blocks, a main shaft base, a bevel wheel, a six-position grooved wheel, a sliding rod, a partition plate, a sliding block, a track, a pushing plate, a pushing plate base, linear bearings, shafts, a bearing, a vertical base, a hand-operated rotating handle and belt wheels. Scattered bullets are transmitted to the feeding device after being sequenced; a discharging port of the feeding device is connected with the automatic bullet chaining device, and the bullet, which is closest to the automatic bullet chaining device, is pressed in the bullet chain; a bullet chain which is not provided with the bullets is used for replacing the bullet chain which is provided with the bullets, and the bullet chain provided with the bullets is conveyed out.

The invention relates to a method for detecting micro photoelectrons, in particular to a method for detecting temperature and a magnetic field simultaneously based on a magnetofluid-filled crystal fiber loop mirror. According to the method, magnetofluid is selectively filled into air holes of a structurally-symmetrical photonic crystal fiber along the center line in the horizontal direction; the birefringence characteristic of the photonic crystal fiber is changed accordingly, and a temperature/magnetic field-adjustable birefringent photonic crystal fiber is formed; a traditional birefringent fiber in a Sagnac fiber loop mirror is replaced by the temperature/magnetic field-adjustable birefringent photonic crystal fiber, the distance between two adjacent resonance valleys and the drift distance of the resonance valleys are changed along with the changes of the temperature and the magnetic field with different change sensibilities, and accordingly the temperature and the magnetic field can be simultaneously detected through the two-parameter matrix method. The method improves the stability performance and measuring sensitivity of a sensor, solves the problem of cross sensitivity of the temperature and the magnetic field of the optical fiber sensor and achieves the purpose of measuring the temperature and the magnetic filed simultaneously through one optical fiber.

The invention discloses a manufacturing method of a stator structure of a submersible motor, wherein the stator structure comprises a stator case, an iron core, a stator winding and a winding lead wire; the upper end and the lower end of the stator case are respectively welded with an upper flange end ring and a lower flange end ring in a sealing way and also fixed with a stainless steel shielding sleeve and a lead wire sealing device that is used for sealing and wrapping the edge of the winding lead wire; insulating fluid sealant is filled in the clearances among the stator case, the stainless steel shielding sleeve, the upper flange end ring, the lower flange end ring, the iron core and the stator winding. The method for manufacturing the stator structure of the submersible motor includes the following sequential steps of manufacturing the stator case and the stainless steel shielding sleeve by rolling according to the argon arc welding means; manufacturing the stator winding and the iron core; lathing the upper flange end ring, the lower flange end ring and a small V-shaped convex ring; assembling, sealed-welding and reshaping; preparing the insulating fluid sealant; filling the insulating fluid sealant; and sealing. The stator structure has the benefits of complete sealing of the stator winding of the motor, high watertight and insulating performances, simple structure and safe and reliable operation.

The invention discloses a three-phase five-column arc extinction electric reactor which belongs to the technical field of transformer design and manufacture. The three-phase five-column arc extinction electric reactor realizes the integral function of ground connection and arc extinction. An amorphous alloy with an air gap is first adopted for an iron core, and the end surface of the air gap has high smooth accuracy, so the noise caused by the adjustable air gap is effectively reduced; three main windings in the middle of the iron core are in star connection, a neutral-point is directly connected to ground, the columns on two sides are provided with air gaps and form a zero sequence magnetic access with the middle column; coils are wound on the columns on two sides, and three inductive loads with different reactive resistance are provided for the columns on the two sides to realize the rough adjustment and fine adjustment of a compensating current. The advantages of high magnetic permeability and low energy consumption of the amorphous alloy are fully utilized to overcome the defects caused by direct current excitation for a long time that the system is easy to become overheated, the active loss is large, the wave distortion of the compensating current is large, and the residue is large after compensation. The three-phase five-column arc extinction electric reactor is mainly used in high-voltage and intermediate-voltage electric power systems.

The invention relates to a magnetic element with permanent magnetic bias, which comprises a magnetic core which is used for forming a magnetic flux loop and provided with at least one air gap fracture. The magnetic element is characterized in that a working coil is wound on the magnetic core, at least one lateral surface of the air gap fracture of the magnetic core is provided with a pair of permanent magnets, the permanent magnets are provided with at least one soft magnetic core for communicating the two permanent magnets so as to form a permanent magnet containing magnetic branch connected in parallel with the air gap fracture, and the reluctance of the permanent magnet containing magnetic branch connected in parallel with the air gap fracture is more than 5 times as high as the reluctance of the air gap fracture of the magnetic element. The direct-current bias resistance of the magnetic core of the magnetic element can be effectively improved, the inductance under certain direct-current bias current is improved, or the section area of the magnetic core is reduced, and the volume is reduced or the length and electric resistance of the copper used for the working coil is reduced; and meanwhile, the defects that the traditional magnetic element with the permanent magnet is easy to be demagnetized by the current pulse and the eddy-current loss of the permanent magnet under the high-frequency flux causes temperature rise to result in failure of the permanent magnet at the high temperature.

The invention provides a millimeter-wave dual-frequency Doherty power amplifier based on a single frequency line. The millimeter-wave dual-frequency Doherty power comprises a dual-frequency power divider, a primary power amplifier dual-frequency input matching network, a secondary power amplifier dual-frequency input matching network, a primary power amplifier tube, a secondary power amplifier tube, a primary power amplifier dual-frequency output matching network, a secondary power amplifier dual-frequency output matching network, and a dual-frequency post matching network, wherein the dual-frequency power divider is connected with the primary power amplifier dual-frequency input matching network through a first single-frequency transmission line of a first preset length; the primary power amplifier dual-frequency output matching network is connected with the dual-frequency post matching network through a second single-frequency transmission line of a second preset length; and the secondary power amplifier dual-frequency output matching network is connected with the dual-frequency post matching network through a third single-frequency transmission line of a third preset length. Through adoption of the millimeter-wave dual-frequency Doherty power amplifier, a dual-frequency phase shift function is realized by an ordinary single-frequency transmission line, so that the problems of large size, great loss and small bandwidth in a conventional dual-frequency transmission line on a millimeter-wave band are solved, and the performance of a dual-frequency phase shift line can be enhanced greatly.

The invention discloses an array-type multi-channel fiber-process Fabry-Perot pressure sensor and a pressure measurement method. From the input end to the output end, the pressure sensor is sequentially provided with an LED (light-emitting diode) light source array (3) composed of an LED light source modulation module (1) and LED light sources (2), a fiber coupler array (5) composed of fiber couplers (4), a fiber Fabry-Perot sensor array (7) composed of fiber Fabry-Perot sensors (6), a demodulation light path module composed of a fiber array (8), an optical wedge (9) and a linear array CCD (charge-coupled device) (10), and a signal processing unit (11). Compared with the prior art, by combining the LED light source array modulation with the fiber array structure, the invention implements sequential quick demodulation of multiple fiber Fabry-Perot pressure sensors by using a single demodulation light path, and solves the problem that the traditional light switch structure can not simultaneously meet the requirements of high-speed switching, low loss and high reliability; and the channel expansion is easy, so that the number of the sensing channels can be up to 64.

The invention relates to a circular groove skeleton type optical cable. The circular groove skeleton type optical cable comprises a reinforce, and a skeleton arranged at the periphery of the reinforce; a cross section of the skeleton is circular shaped, a plurality of skeleton slots for placing the optical fiber ribbons are uniformly formed on an outer wall of the skeleton, and the cross section of each skeleton slot is semi-circular. The defect that the loss is caused since the optical fiber is damaged when the optical fiber ribbons are subject to extrusion, side-bending, friction, tensile stress and pressure stress in the prior art is overcome, the bearing amount of the optical fiber ribbon by the skeleton slot is effectively increased, the carrying capacity is improved, the cost performance of the optical cable with large number of cores is higher, and the optical fiber loss is reduced.

The invention relates to fault tolerance single photon communication technology, and in particular to a multi-channel frequency coding technology based on single photon detection with laser light as an information carrier. Laser light undergoes frequency modulation at a transmitting end and is loaded with information. After channel transmission, the intensity of the laser light attenuates to a single photon magnitude, and the laser light is measured by a single photon detector at a receiving party, and the detected single photon pulse sequence undergoes Fourier transformation so as to extract frequency information. According to the invention, the system has very strong fault tolerance in terms of channel loss and noise. The system addresses the problem of information loss and errors that are caused by channel loss and noise in long-distance laser communication and quantum communication, and provides technical means for the realization of satellite-ground laser communication and quantum secure direct communication.

The invention relates to a method for preparing high-purity soybean saponin A and soybean saponin B by high-speed countercurrent chromatography, which comprises the following steps of: (1) selecting a solvent system which is provided with a fixed phase as an upper phase and a mobile phase as a lower phase and has four components with the volume ratio of 1-5 to 0.5-1 to 1-5 to 5-10; (2) using the fixed phase to fill a countercurrent chromatographic column, regulating the rotation speed of a host to be 600 rpm to 1000rpm and pumping the mobile phase into the column at the flow rate of 0.5 ml/min to 4ml/min; (3) after the whole system is in dynamic equilibrium, introducing samples through an introduction valve; and (4) receiving a target composition according to a UV atlas of a detector, compressing, freezing and crystallizing the fraction to obtain monomers of the soybean saponin A and the soybean saponin B. The soybean saponin A and the soybean saponin B prepared by the method can reach quite high purity and the preparation method has simple operation, high separation efficiency, great separation volume, high recovery rate and good repeatability.

The invention discloses a single polarization fiber resonant cavity based on a 45-degree slant angle FGB (fiber bragg grating) technology. The single polarization fiber resonant cavity comprises a PM (polarization maintaining) fiber coupler, an input end, an input end, a 45-degree slant angle FGB and a fusion welding point, wherein the PM fiber coupler is provided with the output end and the input end; the fusion welding point is arranged between the output end and the input end; and the 45-degree slant angle FGB is written into the output end to serve as a polarizer of the fiber resonant cavity. The polarizer has low insertion loss; the 45-degree slant angle FGB is written into the PM fiber coupler so as to overcome the defects of high loss of polarization devices such as a single polarization fiber and the like, loss of fusion welding among the polarization devices and the fiber resonant cavity, mismatching of mode diameters and the like; therefore, the single polarization fiber resonant cavity based on the 45-degree slant angle FGB technology not only overcomes the noise of polarization fluctuation, but also has high resolution, can be applied to resonant type fiber gyros or other sensing fields and has important scientific significance and application value.

The invention discloses a filtering patch antenna without additional arrangement of filter circuit, and an adjustment method thereof. The antenna comprises a bottom metal reflection floor, an intermediate feed patch and a top parasitic patch. The two sides of the feed patch are each provided with a short circuit probe, the feed patch is provided with a U-shaped groove, a short circuit probe is arranged in front of an opening of the U-shaped groove, and a feed point is arranged behind a closing position of the U-shaped groove. The top parasitic patch is fixed right above the feed patch at an interval of a certain height. According to the invention, the filtering patch antenna itself has a filtering function and realizes a bandpass filtering characteristic without additional arrangement of the filter circuit. The passband edge is deep, the sideband suppression is obvious, the frequency selectivity is good, adjacent frequency interference can be inhibited, the bandpass filtering characteristic and an antenna radiation function are integrated together, the plat grain at a passband position is quite high, and the filtering patch antenna is applied to such mobile communication scenes as WCDMA, 4G-LTE, WLAN and the like.

This invention relates to a functional polyolefin long time effective flow film and its preparation method, which applies the polyether tetra-basic alcohol to be reacted with maleic anhydride or crylic acid to get functional monomers, pre-radiates the polyolefin resin with beta or gamma rays, then carries out smelt graft reaction to the processed polyolefin resin, the functional monomers and electron donating reagent then to blow-molding the graft product to a functional polyolefin long time effective flow film and the valid time is 25-45 days and 13-16 months.