101results about How to "Compensation loss" patented technology

An implantable middle ear hearing device having a tubular vibration transducer to drive a round window is designed to input sound to a round window opposite an oval window in an inner ear. The tubular vibration transducer has a unique structure that does not attenuate the magnitude of a signal, particularly, in a high frequency band. Sound delivery effect is much higher than those of conventional schemes. It is also possible to minimize difficulties associated with and problems resulting from the operation, which the conventional methods would have. Further, the transducer can have a relatively less compact than ossicle contact type transducers, and thus be easily fabricated. The hearing device can be applied to a sensorineural hearing loss patient with the ossicle damaged. Moreover, since sound is directly transmitted without through the ear drum and the ossicle, high efficiency sound delivery is achievable and hearing loss compensation are easy.

The invention provides a soft grid connection method of a grid-connected converter. The method is characterized in that the closed-loop control of the filtering capacitance and the filtering voltage is carried out synchronously; the current inter-loop control is added; and DC pre-charging return circuits are separated and boosted. According to the invention, the non-impact grid connection is realized without increasing great hardware complexity, thereby overcoming the defects of the traditional grid-connected method and improving the reliability of the grid-connected converter.

The invention discloses a hybrid active power filter and a DC side voltage control method thereof. The hybrid active power filter comprises an active power filter, a passive power filter, a harmonic wave current injection branch and a PWM rectifier. The output of the active power filter is filtered by an output filter and then is connected with a primary side of an isolation transformer; the secondary side of the isolation transformer is partially connected with the fundamental wave series resonant circuit of the resonant wave current injection branch in parallel, then is connected with the injection capacitor of the resonant wave current injection branch in series and then combined in the grid with the passive power filter; the PWM rectifier supplies power for the DC side of the active power filter. The hybrid active power filter of the invention not only effectively controls harmonic wave, but also carries out partial reactive power static compensation with certain capacity by the passive power filter. The three-phase voltage type PWM rectifier is applied to control the DC side voltage, thus preferably maintaining the constant of the DC side voltage.

The invention provides a composite structure based on metamaterials and semiconductor low dimension quantum materials. The composite structure based on the metamaterials and the semiconductor low dimension quantum materials is composed of a substrate (1), a buffer layer (2), the semiconductor low dimension quantum materials (3), semiconductor interlayer materials (4) and the metamaterials (5). The metamaterials (5) is in the structure of cycle-assigned metal wire arrays, cycle-assigned metal opening resonance ring arrays or a fishing net. The thickness of the semiconductor interlayer materials (4) is 5 to 50 nanometers. According to the composite structure based on the metamaterials and the semiconductor low dimension quantum materials, a light gain property of the semiconductor low dimension quantum materials and a high speed response property of semiconductor materials to a light signal are simultaneously used, and the composite structure based on the metamaterials and the semiconductor low dimension quantum materials has the dual functions of compensating metamaterial wastage and regulating and controlling metamaterial properties. Under the condition that control light or pump light is additionally arranged, according to the composite structure based on the metamaterials and the semiconductor low dimension quantum materials, the functions of full light opening and closing or full light wavelength conversion can be achieved, and the composite structure based on the metamaterials and the semiconductor low dimension quantum materials has the advantage of being large in extinction ratio.

The invention discloses a non-orthogonal polarization multiplexing phase modulation signal transmission plan based on phase tracking. In a transmitting end with the serial number of 101<1> to 101<N>, one or N non-orthogonal polarization multiplexing (NPDM) phase modulation (m-PSK) signals with different wavelengths are generated; the NPDM phase modulation signals are combined into a wavelength division multiplexing NPDM signal via a wavelength division multiplexer (102); the multiplexed optical signal is transmitted in an optical fiber (103); an optical amplifier (104) is used for performing power compensation to the transmitted optical signal; an electrical signal received by a receiving end is used to realize demodulation output of non-orthogonal phase modulation signals in a digital signal processing unit (108). Compared with a traditional orthogonal polarization multiplexing (PDM) phase modulation signal plan, a non-orthogonal multiplexing phase modulation signal whose polarization multiplexing angle is greater than a certain specific small angle could be adaptively recovered in the invention, and the signal transmission plan has larger tolerance to polarization dependent loss and is suitable for the field of backbone networks for long-distance transmission. Simultaneously, the plan is compatible with the traditional PDM solution, thereby greatly improving the transmission flexibility of a future backbone network.

The invention discloses a synthesis method for a lithium iron phosphate/carbon composite material. The synthesis method is characterized by comprising the following steps of: (1) uniformly mixing lithium phosphate, iron powder, iron phosphate, another lithium source and a carbonous conductive agent precursor, wherein the another lithium source is one or the combination of any of the following components: lithium carbonate, lithium oxalate, lithium acetate, lithium hydroxide and lithium nitrate, and the carbonous conductive agent precursor is one or the combination of any of the following components: glucose, sucrose, citric acid, starch, polyvinyl alcohol, stearic acid and lauric acid; (2) putting the raw material mixture obtained in the step (1) into a ball-milling container and performing full ball milling; and (3) putting the mixture subjected to the ball milling into nitrogen gas and baking the mixture at 600-800 DEG C to prepare the lithium iron phosphate/carbon composite material. The synthesis method is simple in process, and the synthesized lithium iron phosphate/carbon composite material is high in specific capacity and excellent in high-current and cycle performance.

The invention discloses a comprehensive prevention and control technology of a corn waterlogging disaster, wherein soil ridging or compartment ridging regulation and control are utilized. The comprehensive prevention and control technology comprises the following steps: sowing in a wide and narrow row spacing manner during corn sowing, carrying out intertillage ridging or ditching during the five-leaf stage of corn, ditching in wide rows of corn and ridging in narrow rods of corn, or ditching in wide rows on the two sides of a compartment consisting of four or six rows, additionally applying nitrogen-oxygen mixed fertilizer instantly after the corn waterlogging disaster occurs, and spraying spermidine chemical modifier on leaf surfaces at the same time, wherein spraying is carried out once in the morning and night for 2-3 days continuously; other steps are the same as that during normal management, corn is harvested until bracts of corn clusters are dried up, corn grain milk lines disappear, and a black layer appears, namely when grains are completely and physiologically matured. According to the comprehensive prevention and control technology, through comprehensive precontrol advantages of prevention in advance and remedy after the disaster, the root oxygen deficiency after waterlogging can be effectively reduced and retarded, accumulated toxic effect of hazardous substances of soil is reduced, and the root growth and absorption capacity is strengthened, so that the symplastic growth of overground part and root system is promoted, and the yield is improved.

The invention relates to the ultrafast laser technology field, more particularly to a method for improving a contrast of an ultrashort pulse. The method is characterized in that: an active enhanced external cavity coherent combination optical parametric amplification method is employed and the method relates to an active non-linear optical resonant cavity; the structure of the optical resonant cavity can be formed by a plurality of cavity mirrors in an annular shape or a folding shape; a non-linear crystal is arranged in the cavity to realize parametric amplification; the length of the enhanced external cavity is accurately controlled by electronic line control that is adhered to one of cavity mirrors; a repetition frequency corresponded to the length of the enhanced external cavity is locked on a repetition frequency of an input seed pulse through an electronic feedback loop. According to the method provided in the invention, it is hopeful to realize output of high energy laser, wherein the pulse contrast of the high energy laser is superior to 10-12; it is helpful for researchers to know better a process and a mechanism of mutual interaction between a laser and a substance; and a reliable and stable research tool is provided for researches on strong field laser physics and nonlinear optics.

The invention discloses an active resonant cavity based self-similarity ultrashort pulse amplification system and a working method therefor. The self-similarity ultrashort pulse amplification system is characterized by comprising an optical frequency comb-shaped generator, a pre-chirping management apparatus, an active optical resonant cavity and a dispersion compensation apparatus that are connected in sequence, wherein the active optical resonant cavity is also connected with an electronic control circuit and a pump laser. The active resonant cavity based self-similarity ultrashort pulse amplification system has the advantages that an outer cavity enhancement technique is adopted, so that the self-similarity amplification for the ultrashort pulse is realized by using solid gain mediums, and the gain narrowing is overcome; the nonlinear widening of spectrum in the amplification process is realized, the pulse contract ratio is improved, and the problems of unstable modes, self-focusing and the like existing in the high-power amplification process of an optical fiber amplifier are effectively restrained; and the self-similarity ultrashort pulse amplification system is used as a reliable scientific research tool for researching high-field laser physics and non-linear optics.

The invention relates to a multipoint gas sensing system based on an optical fiber buffer, which comprises an address encoder, a double-wavelength light source, a multipoint optical fiber sensing network and a demodulator. The address encoder generates an address code and a read-write control signal of different monitoring points; each detecting unit of the multipoint optical fiber sensing network adopts a buffer structure introduced with a gas absorbing chamber in an optical fiber loop; a double-loop coupling all-optical buffer and a polarization type all-optical buffer can be adopted; under the control of a write signal, the optical signal of the address code is written into the optical fiber loop of the detecting unit and circularly absorbed by the gas many times; the absorbed optical signal is read out and sent to the demodulator for photoelectric conversion, comparison with the reference light, address decoding and data processing in order to gain the gas concentration in different points and realize the multipoint gas monitoring. The system gains the good effects through improving the structure of the absorbing chamber, adding an optical amplifier, a polarization control and a device with the wavelength of 1665nm, and is used in the monitoring of the gas which has the wavelength of 1665 nm and is near provided with an absorption peak.

The invention relates to a Raman spectrum high electromagnetic enhancement substrate coated with a gain medium, which is an enhancement Raman spectrum substrate structure on a surface coated with gain medium on a metal blind hole array surface, wherein round, rectangular or triangular blind hole arrays are uniformly distributed on substrate metal, and the coated gain medium is a rhodamine6G/polymethylmethacrylate film which is prepared by dissolving dye molecules in an organic solvent. The preparation comprises the following steps of: dissolving rhodamine6G and polymethylmethacrylate into dichloromethane; then coating the obtained solution on the surface of a substrate metal chromium film and drying to form a film coated with the gain medium on the surface of the substrate metal chromium film; and processing blind hole arrays on the surface of the film by adopting a focused ion beam lithograplay technology. The Raman spectrum high electromagnetic enhancement substrate has the advantages that the gain medium material is introduced onto a traditional SERS (Surface Enhanced Raman Scattering) substrate to compensate metal loss so as to obtain SERS enhancement factors far higher than that of a substrate without a gain medium substrate, so that the practicality of the SERS is further improved, and a technical reference is provided for the research of SERS enhancement mechanism.

The invention relates to a micro-pulse laser radar light source with high pulse energy. The light source is formed by an oscillator stage and an amplifier stage; and the light path of the amplifier stage and the light path of the oscillator stage are in a coaxial mode. At the oscillator stage, a dual-path Q switch is used for compensating thermal depolarization loss of a laser; dual-path outputs are amplified respectively by the independent amplifier stage and then are combined, thereby realizing functions of thermal depolarization compensation and energy amplification. At the oscillator stage, a holophote, a laser crystal rod, two dielectric film polarizers, two Pockels boxes, and two output coupling mirrors are successively arranged on the light path; the two dielectric film polarizers are arranged at a brewster angle, incident surfaces of other elements are parallel to each other; and two end surfaces of the laser crystal rod are parallel to each other. According to the invention, losses of output energy by thermal depolarization can be compensated and the output energy can be amplified further; compared with the prior art, the conversion efficiency, the pulse energy, and the light beam quality of the light source are substantially improved; and the detection distance and detection precision of the micro-pulse laser radar are enhanced.

The invention relates to a method for building a silicon-based coupling resonance loop structure capable of providing stimulated Raman scattering light grain. The method comprises the following four steps of: 1, making a required silicon on insulator (SOI) substrate on the surface of common pure single-crystal silicon by an ion implantation method; 2, building the silicon-based coupling resonanceloop geometrical light path structure capable of providing the stimulated Raman scattering optical grain on the SOI substrate; 3, building a silicon-based SOI ridge waveguide on the geometrical lightpath structure; and 4, respectively arranging a p+ doped area and an n+ doped area at the left side and the right side of the silicon-base ridge waveguide to form pn junction, and continuously performing a simulated Raman process to generate light grain. By Raman light grain, the loss of transmission light in the structure can be effectively compensated, and the signal-to-noise ratio of the Ramanoptical grain serving as an optical waveguide gyro can be improved. Therefore, by the method, an integrated optical waveguide gyro with high sensitivity can be obtained. Moreover, the method has better practical values and wide application prospects in the technical field of integration of an optical gyro coupling resonance loop.

The invention provides a radome, an antenna structure and a wireless electronic device. The antenna structure comprises a radome and a radiator located inside the radome; Where (n-1) *[Lamda]1/2 (H1 (n*[lamda]1/2, H1 denotes the thickness of the radome,[Lamda]1 denotes the propagation wavelength of the electromagnetic wave emitted by the radiator in the radome, and n is a positive integer; And/or,L=a*b*[lambda]0, L denotes the length of the line segment from the radiation surface of the radiator to the inner side of the radome, the centerline being a straight line perpendicular to the radiation surface of the radiator, [lambda]0 denotes the propagation wavelength of electromagnetic waves emitted from the radiator in air, a denotes a preset parameter, and b is a positive integer. In this way, the directivity and gain effect of the electromagnetic wave beam can be enhanced, so as to compensate the loss of the electromagnetic wave in the wireless transmission and achieve a longer wireless transmission distance, thereby improving the overall performance of the antenna structure, reducing the area, circuit complexity and corresponding cost required by the conventional design, and enhancing the overall competitiveness of the product.

The invention discloses a radar signal anti-interference low-loss recovery method of a coding and decoding convolutional neural network, and mainly solves the problem of target information loss after radar signal interference suppression in the prior art. The method comprises the following steps: 1) constructing a time-frequency signal low-loss recovery network; 2) generating a training data set composed of time frequency and mask data; 3) inputting data in the training data set into the time-frequency signal low-loss recovery network, and performing iterative training on parameters of the time-frequency signal low-loss recovery network by using a momentum method to reduce a loss function value; and 4) carrying out time-frequency domain anti-interference on the interfered radar echo, inputting the echo after anti-interference into the trained time-frequency signal low-loss recovery network to obtain a recovered time-frequency domain echo, and converting the recovered time-frequency domain echo into a time domain. The method has the capability of performing low-loss repair on defect signals after interference suppression in a time-frequency domain, has universality and robustness for time-frequency aggregation interference, and can be used for interference resistance of the synthetic aperture radar.

The invention discloses a structure of the front end of a gallium arsenide base monolithic photoelectron integrated receiver and a manufacturing method thereof. Aiming at a distributed amplifier adopting cascode structure as a gain unit, the invention provides a method comprising grid transmission line micro-strip straight line layout, a leakage transmission line forward and reverse terminal micro-strip impedance adjustment as well as resistance and a plurality of micro-strip line impedance adjustment in a gain unit, which obtains favourable frequency domain and time domain response; the method combines gallium arsenide PHEMT amplifier technology and MSM photodetector technology, adopts the technology of forming a photodetector table board by reactive ion etching, the technology of successively manufacturing MSM photodetector interdigital electrodes and PHEMT device grid electrodes, and the anti-reflection and passivation medium technology of forming the MSM photodetector by three-time silicon nitride medium deposition. The invention has the advantages that the distributed amplifier has compact layout and favorable combination property, the band width advantage is fully performed, and combination property is favorable; monolithic integration technology is reasonable, gives consideration to the characteristics of both the PHEMT amplifier and the MSM photodetector detector and has high flowing efficiency.

The invention provides a system for providing tunable balanced loss compensation in an electronic filter. Tunable balanced loss compensation is provided by using cross-connected balanced transconductors and self-connected balanced transconductors. The cross-connected balanced transconductors and the self-connected transconductors compensate the unbalanced loss across the electronic filter. The self-connected balanced transconductors compensate the balanced loss across the electronic filter. Further, the cross-connected and the self-connected balanced transconductors are tunable by adjusting the values of their transconductances, thereby providing tunable balanced loss compensation.

The invention relates to a construction method of a three-dimensional active coupling resonance loop structure with rare earth doped glass as a matrix material. The method comprises the following steps: step one, preparing blocked and cubic rare earth doped glass as a matrix material by employing a traditional fusion method; a doping concentration range of an rare earth ion in the glass matrix is as follows: Er: 0.6 to 10 wt%; and Yb: 1 to 10 wt%; and step two, etching a coupling resonance loop waveguide structure on the prepared blocked and cubic rare earth doped glass by utilizing a femto second laser. The three-dimensional active coupling resonance loop structure provided in the invention can be used for constructing three-shaft integrated optical gyro to measure angular velocities from three directions. Doping of the rare earth ion enables optical gain to be provided, so that loss of transmitted light in the structure can be effectively compensated and thus a signal to noise ratio of an optical waveguide gyro is enhanced. Therefore, when the construction method provided in the invention is implemented to construct the optical waveguide gyro, a three-shaft integrated optical gyro with high sensitivity can be realized. The construction method ahs good practical value and wide application prospect in the field of coupling resonance loop technology of an integrated optical gyro.