106results about How to "Improve modulation effect" patented technology

The present invention teaches a method and apparatus for physiological modulation, including neural and gastrointestinal modulation, for the purposes of treating several disorders, including obesity, depression, epilepsy, and diabetes. This includes chronically implanted neural and neuromuscular modulators, used to modulate the afferent neurons of the sympathetic nervous system to induce satiety. Furthermore, this includes neuromuscular stimulation of the stomach to effect baseline and intermittent smooth muscle contraction to increase gastric intraluminal pressure, which induces satiety, and stimulate sympathetic afferent fibers, including those in the sympathetic trunk, splanchnic nerves, and greater curvature of the stomach, to augment the perception of satiety.

The present invention teaches a method and apparatus for user control and operation of physiological modulation, including neural and gastrointestinal modulation, for the purposes of treating several disorders, including obesity, metabolic disease, and other conditions. This includes programming of neuromodulatory signal for the modulation of autonomic neural and neuromuscular modulators, used to modulate tissues, including the afferent neurons of the sympathetic nervous system to induce satiety and efferent neurons to modulate metabolism. The apparatus and methods include a conformal neuromodulator array which facilitates minimally invasive placement of neuromodulators in communication with target tissues.

The present invention teaches methods and apparatus for user control and operation of physiological modulation, including neural and gastrointestinal modulation, for the purposes of treating several disorders, including obesity. This includes programming of neuromodulatory signal for the modulation of autonomic neural and neuromuscular modulators, used to modulate tissues, including the afferent neurons of the sympathetic nervous system to induce satiety and efferent neurons to modulate metabolism.

A method, apparatus, and surgical technique for the modulation of autonomic function, for the purpose of treating any of several conditions and diseases, including obesity, metabolic disorders, endocrine disorders, diabetes, respiratory disease, asthma, inflammatory disease, immunological disease, infection, cancer, cardiac disease, cardiovascular disease, cerebrovascular disease, stroke, vasospasm, vascular disease, psychiatric disease, depression, affective disorders, anxiety disorders, and other conditions. This includes neural and tissue modulators, including implanted devices, used to modulate efferent and afferent autonomic neurons to influence or control autonomic or other neural function, including modulation of sympathetic and parasympathetic nervous system components as well as their combination.

The invention discloses a wireless terminal transceiver of a 60GHz RoF (Radio over Fiber) access system. Secondary subharmonic frequency mixing is adopted, and the frequency of a needed local oscillation signal is reduced in a frequency multiplication frequency mixing way, so that the problem of leakage of the local oscillation signal to an antenna, i.e., a radiofrequency transmitting end in the conventional wireless terminal transceiver scheme is solved, and the circuit modulation performance is improved. Meanwhile, a downlink medium frequency analog signal obtained after secondary subharmonic down-conversion is subjected to downlink medium frequency digital signal processing after ADC (Analog to Digital Conversion) to obtain a needed downlink digital baseband signal; and an uplink digital baseband signal is subjected to uplink medium frequency digital signal processing to obtain an uplink medium frequency digital signal. A series of medium frequency digital signal processing such as odd-even extraction or interpolation, symbol modulation, delay filtering, demodulation or modulation and the like is performed in a digital domain, so that the problem of IQ orthogonal mismatch caused by 90-degree phase change on a local oscillation signal for obtaining two paths of analog signals in an analog frequency domain of the conventional receiver is solved.

The invention provides a tunable nanometer antenna and a preparation method thereof. The tunable nanometer antenna comprises three layers which comprise an upper layer metal structure, a middle layer single-layer grapheme and bottom substrate materials; the upper layer metal structure is a bowknot structure; the bowknot structure is formed by two isosceles trapezoids and a square. The preparation method of the tunable nanometer antenna comprises the following steps of covering the layer of single-layer grapheme on a silicon dioxide substrate through a chemical vapor deposition method; coating resist coating in a rotary mode on the single-layer grapheme; achieving structural corrosion and developing through the electron beam lithography technology; achieving evaporation of a golden layer through the vacuum electron beam evaporation technology; obtaining a final nanometer optical antenna through a lift-off process. The tunable nanometer antenna has the advantages of being small in size due to the fact that the thickness of a metamaterial structure is in the dozens of nanometer level and beneficial to application in integration optics; being high in signal intensity due to the fact that magnetic field enhance through the nanometer optical antenna can achieve more than 20000 times under illumination of incident light under specific frequency; being obvious in modulation effect.

The invention relates to an online projection objective wave aberration detection device and method. The detection device comprises a light source, a rotary scatterer, a first focusing lens, an optical fiber array, a second focusing lens, a scattering optical element, an object plane optical grating, an image plane optical grating, a two-dimensional photoelectric sensor, a phase-shift control module and a computer, wherein the rotary scatterer is composed of a support, an electric motor and a circular diffusion scattering optical element, and is combined with the multimode optical fiber array for converting a coherent light or partially coherent light source into incoherent light; ten interference fringe patterns with phase shifting amounts of 0, pi / 6, pi / 3, pi / 2, 2pi / 3, 5pi / 6, pi, 5pi / 3, 3pi / 2 and 11pi / 6 respectively are acquired to calculate a phase position and the influence of multilevel diffraction light interference of the optical grating on the phase position extraction precision is eliminated. The device and the method can improve the modulation effect of the object plane optical grating on the optical field spatial coherence so as to achieve a high-precision alignment effect, reduce the system error of phase position extraction in wave aberration detection and improve the wave aberration detection precision of an optical system.

An ESD protection structure for an electronic circuit arrangement, in particular for a HF power amplifier is provided. In the ESD protection structure, at least two semiconductor diodes are connected anti-serial to one another. Further, the pn junctions of the two semiconductor diodes possess a common zone of semiconductor material of a certain conductivity type. Thus, an ESD protection structure is provided that can be used even at relatively high frequencies, which offers a reliable protective effect in the event of overvoltages with improved modulation capability in the HF range without resulting in signal distortion during operation.

The invention discloses a method for MMC type VSC-HVDC system precharge control. The method is based on a CPSM (carrier phase shifted modulation) strategy and controls by adoting a voltage outer ring and a current inner ring, wherein the voltage ring controls capacitor voltage of a sub-module, and the current ring controls three-phase AC current. The method disclosed by the invention gives consideration to the precharge speed and the precharge efficiency while limiting impact current and preventing overvoltage. The control method is clear in thinking, easy in engineering realization, and has good dynamic performance and steady-state performance.

In the present application, a power semiconductor device includes a first-conductive-type first base region having a first principal surface and a second principal surface opposite to the first principal surface, a second-conductive-type second base region disposed on the first principal surface and at least three groove parts parallel to each other disposed from a surface of the second base region. The device further includes insulating films covering inner walls of the respective groove parts, conductive trench gates filled on the insulating films, a first-conductive-type emitter region disposed in the second base region, and a second-conductive-type collector region disposed on the second principal surface of the first base region. The trench gates embedded in the first groove part and the third groove part are electrically connected to the gate electrode, and the trench gate embedded in the second groove part is electrically connected to the emitter electrode.

The invention discloses an aviation secondary radar signal emitter and a coding method and belongs to the aviation electronic technology field. The emitter comprises an FPGA and a D / A converter. A radio system is utilized, analog components of secondary radar emission signal circuits of a transponder and a range finder are minimized, signal codes and up conversion are processed through a digital circuit, message signals in each test mode are generated through the FPGA, namely interrogation messages in ATCRBS and S mode transponder test modes, after baseband re-sampling and interpolation filtering, etc., pulse signals are modulated onto digital carrier signals in the FPGA through an all-digital up-conversion mode, after high-speed D / A conversion, required RF pulse signals are directly generated, and emission signals required in various modes are generated in real time through the FPGA and high-speed D / A. The circuit is simple and reliable, and modulation performance is good.

The invention relates to flocculating agent blending equipment, in particular to efficient blending equipment for flocculating agents used for sewage treatment. The technical effect that the efficient blending equipment for flocculating agents used for sewage treatment which is uniform in blending, high in blending speed and simple in structure is provided is achieved. In order to achieve the technical effect, the provided efficient blending equipment for s flocculating agents used for sewage treatment comprise a first electronic control valve, a discharging pipe, a small belt pulley, a first rotary shaft, a first bearing seat, a first mounting base, an electric push rod, a second mounting base, a cam, a left frame and the like. The left frame is welded to the left end of the top of a bottom plate. The first mounting base and a support are welded to the left side of the top of the bottom plate. The first mounting base is located on the left side of the support. The efficient blending equipment for the flocculating agents achieves the effects of uniform blending, high blending speed and simple structure, the important functions played by the equipment comprise the good blending effect and the improvement of working efficiency, and the safety is high.

The invention relates to a novel space vector pulse width modulation method of a five-phase inverter. The space vector pulse width modulation method comprises constructing five-dimensional reference voltage vectors; and optimizing conducting times of five bridge arm power tubes of the inverter, which has the steps of: sequencing the conducting times of the five bridge arm power tubes, defining action times of two zero vectors of the inverter and calculating the action times of optimized zero vectors, calculating the conducting times of the five optimized bridge arm power tubes of the inverter, and outputting a switch control signal. By reassigning the action times of the zero vectors, modulation range is expanded, and the utilization rate of DC bus voltage is effectively improved.

The disclosed device comprises three pieces of parallel placed convex lenses with coincided centerlines, a beam splitting plate, a plane reflector and a Bragg acousto-optic modulator. Received by lens 1 and passing through lens 2, an inquire light becomes a narrow beam. Then, passing through the beam splitting plate, the beam is divided into a transmission light and a reflection light. The transmission light is a receiving signal. Reflected by the plane reflector, the reflection light forms an echo light beam and passing through the Bragg acousto-optic modulator to return in direction parallel to the inquire light. Diaphragm and light filter can be added to the device to filter the inquire light in space and frequency in order to raise detection SNR at response party. Features are: small loss of luminous energy, simple structure, and small size. Moreover, the invention increases communication and identification distances, and possesses better modulation effect.

The invention discloses an optical transceiver module with double arms of a modulator capable of achieving modulation independently. The optical transceiver module comprises a laser device, a laser device drive circuit, a transmitting-end optical assembly, a receiving-end optical assembly, a modulator drive circuit, a receiver circuit and a microprocessor, wherein the transmitting-end optical assembly comprises a Mach-Zehnder modulator, the modulator drive circuit comprises a first-stage amplifier and two second-stage amplifiers connected to the output end of the first-stage amplifier in parallel, the output ends of the two second-stage amplifiers are connected with the Mach-Zehnder modulator respectively, and different modulation voltages of two drive sub-circuits are controlled through the microprocessor. In this way, different modulation depths of the left and right arms of the Mach-Zehnder modulator are achieved, longer-distance transmission is achieved, and optical transmission cost is greatly reduced; besides, because the modulator drive circuit is in communication with the microprocessor, only an internal drive circuit and I2C communication between the microprocessor and the drive circuit rather than input and output of a client are needed to be additionally designed, and the optical transceiver module has good compatibility.

The present invention belongs to the field of optical detection devices, and specifically discloses a polarization modulator and a polarization measurement system, comprising a rotating compensator and a polarizer, in which the rotating compensator is a continuously rotating composite waveplate, the composite waveplate is composed of a plurality of single-waveplates of the same material, and the overall structure of the composite waveplate is determined by thicknesses and fast axis intersection angles of the respective single-waveplates according to the optimization design of the polarization characteristic transfer matrix of the polarization modulator. The polarization modulator of the invention has the advantages of simple structure, easy processing and a wide applicable wavelength range, and a wide-waveband polarization measurement system can be designed based on the polarization modulator, which is adapted to the requirements of wide-waveband precision polarization measurement.

The invention belongs to the field of astronomical optical observation, and particularly relates to a spectrum broadening method and a spectrum broadening device based on a digital micromirror device(DMD). The spectrum broadening method comprises the steps of: firstly, subjecting a target spectrum to chromatic dispersion to a row or column direction of the digital micromirror array DMD, wherein the row or column direction of the DMD is consistent with a row or column direction of a detector; secondly, segmenting the spectrum subjected to chromatic dispersion along row pixels or column pixelsof the detector according to different spectral bands by means of the digital micromirror device DMD and reflecting the segmented spectral bands to different positions on the same plane, so as to realize spectrum broadening; thirdly, compressing and collimating the segmented different spectral bands to enter into an interference module to obtain interference fringes; and finally, performing secondary chromatic dispersion on the interference fringes in the row or column direction of the detector to realize high-precision light splitting, so as to obtain high-resolution spectral interference fringes. The spectrum broadening method and the spectrum broadening device realize the spectrum broadening of the detection system while avoiding the problems of fringe bending, contrast reduction and the like caused by cross chromatic dispersion, and solves the problem that reflected surfaces are not on the same image plane during spectral narrow band segmentation under the condition of multi-targetdetection by adopting an image segmentation device broadening method.

The invention discloses an alfalfa layering parting harvester and an alfalfa layering parting harvesting method, and belongs to the field of agricultural mechanical manufacturing. The harvester mainly comprises a self-propelled base plate, a machine frame, an upper mowing platform, an upper conveyor, a storage box, a leaf detacher, a lamina conveyor, a lower mowing platform, a modulator, a strip collector, an upper mowing platform hydraulic rod and a machine frame hydraulic rod. During operation, the harvester completes alfalfa layering parting harvesting by the following three main steps of:harvesting alfalfa top layers, performing parting harvesting of stems and leaves, and harvesting the stems. The method for harvesting the alfalfa is not influenced by the weather, the loss of flowersand the leaves in the collection and storage process can be reduced, the separation harvesting of the stems and the flowers and leaves of alfalfa is realized, and high-quality primary grass products are provided.

The invention discloses a stable laser light source. Given optical power and fed-back optical power are added by an adder, and then the added optical power enters an optical power regulator. The output end of the optical power regulator is connected to one end of an analogue switch, and a biasing circuit is connected to the other end of the analogue switch. The analogue switch is controlled by a digital modulation signal. The common end of the analogue switch is connected to a second adder. One of the other two input ends of the second adder is connected with an analogue modulation end, and the other of the other two input ends of the second adder is connected with a current feedback end. The output of the second adder controls a semiconductor laser tube LD through a current regulator anda driving / protection circuit. The semiconductor laser tube LD serves as the current feedback end after passing through a feedback coefficient K2f. A diode D is connected in parallel with the two endsof the semiconductor laser tube LD. The cathode of a photoelectric tube PD serves as an optical power negative feedback end after passing through a feedback coefficient K1f. In digital modulation, first, second and third contact terminals of the analogue switch are turned on in turn; and in direct current or analogue modulation, the third contact terminal and the first contact terminal are turnedon all the time. The stable laser light source has the advantages of high modulation performance, stable laser power and high turning-off performance.

The invention discloses a light emitter, which comprises a current mode logic driving module, a modulator and a terminating module, the current mode logic driving module is connected with the input end of the modulator in a direct coupling mode, and the current mode logic driving module is used for generating and outputting a high-speed differential driving signal; the output end of the modulatoris connected with the input end of the terminating module in a direct coupling mode; the modulator is used for modulating an optical signal of the modulator according to the received high-speed differential driving signal to obtain a modulated optical signal and outputting the modulated optical signal; and the terminating module is used for performing far-end impedance matching on the received high-speed differential driving signal. The light emitter has the advantages of saving hardware cost, reducing direct current power consumption, reducing circuit design complexity and facilitating high-density multi-channel integrated design.

The invention relates to a multi-loop direct-current emergency power modulation system and a multi-loop direct-current emergency power modulation method based on a PMU (power management unit). The modulation system comprises a sensor, a PMU device, a GPS (global positioning system), a control main station and a signal transmitter, wherein the PMU device is connected with a convertor station through the sensor, the control main station is respectively in communication connection with the PMU device and the signal transmitter, the GPS is connected with the PMU device, and the signal transmitter is connected with the convertor station. The modulation method comprises the following steps of adopting the PMU device to sample each convertor station in real time, calculating a voltage phasor value and corresponding power, outputting the phasor data, and transmitting the phasor data with a time scale to the control main station according to a clock signal of the GPS; and adopting the control main station to calculate a modulation power control signal of each loop of direct-current power transmission system, and modulating the power of each convertor station according to the modulation power control signal. Compared with the prior art, the modulation system and the modulation method have the advantages that the operation stability of a power system can be improved, and the modulation effect is good.

The invention discloses a low-noise, efficient and energy-saving air conditioner which has the advantages of low energy consumption, low noise, high efficiency and simple structure. The air conditioner comprises a compressor, a condenser and a fan arranged in a cover cap, and a motor of the fan is provided with a cooling jacket. Space in the cover cap is connected with an air inlet pipe and an air outlet pipe, and a water containing tank and an atomizer are arranged at the lower part of the condenser.

The invention relates to a cultivation method for purple sweet potatoes and a method for processing purple sweet potato powder and belongs to the technical fields of sweet potato cultivation and processing. A new cultivation method is obtained by changing the concentration of thiophanate methyl water solution for soaking seeds, sweet potato seedling planting time and density, fertilizer types and consumption, and types and concentration of inhibitors. According to the cultivation method, acre yield of fresh potatoes is more than 2,200kg, the large medium sized tuber rate is higher than 90.3 percent, anthocyanin content is more than 120mg / 100g, and starch content is more than 31.1 percent; the yield for preparing the purple sweet potato powder from the purple sweet potatoes harvested by the cultivation method is higher than 41.6 percent. Methods of cooking, mashing, drying and pulverizing are adopted, sweet potatoes are sliced, and the sliced sweet potatoes are blanched, cooled, cooked, mashed, dried, pulverized and screened to form the purple sweet potato powder, the defect of poor cluster caused by improper color protection in the traditional process is overcome, and the processed product is bright in color, high in dispersibility and high in water absorption.

The invention relates to a lithium niobate-based PM-QPSK integrated light modulator and a working method thereof. The lithium niobate-based PM-QPSK integrated light modulator comprises an upper electrode, a lower electrode, a lining and lithium niobate crystals, wherein a polarization demultiplexer, two IQ modulators in parallel and a polarization multiplexer are sequentially etched on the lithium niobate crystals in a light path direction; the upper electrode and the lower electrode are respectively arranged on the upper surface of the lithium niobate crystals and below the lining; the polarization demultiplexer and the polarization multiplexer are respectively a lithium niobate polarization demultiplexer based on MZI and a lithium niobate polarization multiplexer based on MZI. As the lithium niobate-based PM-QPSK integrated light modulator is provided with the lithium niobate polarization demultiplexer and the lithium niobate polarization multiplexer manufactured on a birefrigent effect of lithium niobate, the conventional method that a polarization multiplexer is manufactured on the basis of a silicon substrate is changed, a polarization demultiplexer and a polarization multiplexer based on the silicon substrate and IQ modulators are integrated on the same piece of crystal, and the allowance is far smaller than a silicon substrate process.

The present invention discloses a frequency domain equalization method, including transmitting an optical signal transmitted over a long distance to a dispersion compensation device, and performing dispersion compensation and equalization processing on the optical signal through the dispersion compensation device. The present invention utilizes the compensation effect of a single dispersion compensation device to realize dispersion compensation and frequency equalization on the optical signal, reducing the bandwidth requirements for the devices at the emitting and receiving ends, allows the directly modulated laser to still support long-distance fiber transmission in the case of high-speed signal modulation, and greatly reduces the system cost. In addition, transmissions over different distances can be supported by changing the value for the dispersion amount, so that the distance can be adjusted flexibly according to the requirements in the data center or other application scenarios.

Disclosed are a monophase full-bridge inverter circuit and a modulation method thereof. The monophase full-bridge inverter circuit comprises a bus capacitor, a full-bridge inverter circuit, a filter circuit, a first reverse-resistance IGBT (insulated gate bipolar transistor) and a second reverse-resistance IGBT. Input ends M and N of the inverter circuit are correspondingly connected with a positive electrode and a negative electrode of the bus capacitor, and output ends A and B of the inverter circuit are connected with the filter circuit. A collector and an emitter of each of the first IGBT and the second IGBT are correspondingly connected with the output end A and the output end B. Each bridge arm of the inverter circuit comprises a switch tube and an inverse-joint diode, an emitter of the first bridge arm and a collector of the second bridge arm are connected with the output end A, and an emitter of the third bridge arm and a collector of the fourth bridge arm are connected with the output end B. A collector of the first bridge arm and a collector of the third bridge arm are connected with the input end M, and an emitter of the second bridge arm and an emitter of the fourth bridge arm are connected with the input end N. Based on the above circuit, the modulation method includes controlling the second IGBT to make in the positive half circle of output voltage and controlling the first IGBT to make in the negative half circle. By the monophase full-bridge inverter circuit, efficiency of inverters is improved, pulse of common mode voltage can be effectively suppressed, and modulation effect is better.

The invention discloses a tunable metamaterial structure based on variable surface square resistance and a manufacturing method thereof, which are applied in the fields of modulators, detectors and the like of infrared and Terahertz bands. The manufacturing method of the tunable metamaterial structure comprises: manufacturing a three-layer metamaterial structure having a graphic metal film at the top, and then bombarding the metamaterial structure by adopting oxygen plasma to control the surface square resistance of the top metal film, thus obtaining the tunable metamaterial structure. Before bombarding of the oxygen plasma, the dielectric film covers the top metal film to selectively control the square resistance of a part of the top metal film, thus modulating the resonance peak frequency of a metamaterial and the like. The tunable metamaterial structure is simple in manufacturing process and tuning manner, is compatible with an MEMS process and obvious in infrared and Terahertz band modulation effect, and has a broad application prospect.

The invention discloses an electro-hydraulic servo device which comprises a valve body, a nozzle, a slide valve element, a filter screen, a buffer spring and a feedback pull rod. A first cavity and a second cavity are formed in the valve body. The filter screen, the slide valve element and the nozzle are all arranged in the first cavity. The nozzle is connected with the upper portion of the slide valve element. The filter screen is located below the slide valve element. A hole is formed between the first cavity and the second cavity. One end of the feedback pull rod is connected with the hole and the other end of the feedback pull rod is located in the second cavity. The buffer spring is arranged on the feedback pull rod. The electro-hydraulic servo device has the advantages of being small in size, high in power amplification, good in linearity, small in dead zone, high in response speed, smooth and reliable in motion, suitable for analog quantity and digital quantity and good in modulation effect.

The invention relates to a 2.9-micron intermediate infrared mode-locked laser, and belongs to the field of the full-solid-state intermediate infrared laser. The 2.9-micron intermediate infrared mode-locked laser comprises a 150nm optical fiber Raman laser, a collimation focusing system, a laser input mirror, a laser crystal, a laser reflector module, a laser output mirror and a mode-locked element; the pump light output by the 1150nm optical fiber Raman laser is irradiated to the laser crystal after passing through the collimation focusing system and the laser input mirror in order; the laserinput mirror, the laser crystal, the laser reflector module, the laser output mirror and the mode-locked element form a laser resonant cavity, the produced mode-locked laser is output in a coupling bythe laser output mirror; the laser crystal is holmium-praseodymium double-doped, the mode-locked element is graphene or black phosphorous saturable absorber. By adopting the 1150-nm laser pumping holmium-praseodymium double-doped laser crystal, the novel two-dimensional material graphene or black phosphorous are used as the saturable absorber to successfully realize high-efficiency high-beam quality 2.9-micron band mode-locked intermediate infrared laser output.

The invention provides an energy and information composite transmission system for implementing full duplex communication based on a galvanometer, and belongs to the field of laser communications. Inorder to solve the existing technical problem, a first signal source loads signals to a laser through a biasing circuit, the signals are collimated by a first collimating lens through a splitter, andthen emitted to a passive end; after a second collimating lens receives light, the light is converged to a diaphragm center; the light is transformed into parallel light via a convergent lens, then reflected to a short focal lens via the galvanometer, and the parallel light is converged to a photovoltaic cell panel via the short focal lens; corresponding electric signals are generated and the electric signals pass through a subsequent processing circuit, and light energy is collected and converted into electric energy as the working energy of the passive end; a second signal source loads the signals on a galvanometer driver and generates a control signal for the galvanometer, vibrates and makes the angle of a return light beam change with the signals, and modulates the return light beam inan OOK format; and the light beam returns along the original way, and is reflected to a plano-convex lens by the splitter; and the plano-convex lens converges the light beam to a detector, and the light beam is processed by an active end signal processing module and then upstream communication is completed.