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30results about How to "Overcoming rate" patented technology

Device for optically generating radar pulse compression signals

The invention discloses a device for optically generating radar pulse compression signals. The device comprises a laser, a coding signal generator, a microwave signal generator, a polarization multiplexing double-parallel Mach-Zehnder modulator, a direct-current power supply, a photoelectric detector, a polarizer and a polarization controller; and, by utilization of the frequency-shifting characteristic and the phase modulation characteristic of the polarization multiplexing double-parallel Mach-Zehnder modulator, after being coupled through the polarizer, polarization orthogonal modulated optical carrier signals and unmodulated optical first-order sideband signals output by the polarization multiplexing double-parallel Mach-Zehnder modulator are detected through the photoelectric detector, so that phase coded or linearly frequency-modulated radar pulse compression signals can be generated. On the basis of the integrated modulator structure, the device disclosed by the invention is simple in system composition and steady in performance; and, the following disadvantages can be overcome: the traditional manner of generating pulse compression signals in the electric domain is limited by the rate and the bandwidth of an electronic device; high-frequency signals are generated difficultly or cannot be generated; the time-bandwidth product is limited; the reconfigurability and the frequency adjustability of the system are poor, etc.
Owner:EAST CHINA NORMAL UNIV

Preparation method and application for iron oxyhydroxide

The invention belongs to the technical field of preparation of metal oxyhydroxides, and specifically relates to a preparation method and an application for iron oxyhydroxide. The preparation method comprises the following steps: under the condition of supergravity, mixing a Fe2+ metal salt solution with an alkaline solution, and allowing oxygen to reversely contact with a reaction solution at thesame time so as to obtain a mixed reaction slurry; subjecting the mixed reaction slurry to gas-liquid separation, and subjecting an obtained liquid to aging under the conditions of stirring and bubbling oxidation so as to prepare a suspension containing the iron oxyhydroxide; and subjecting the suspension to liquid-solid separation, and subjecting an obtained solid phase to washing and drying so as to obtain the iron oxyhydroxide. According to the invention, the precipitation process and the bubbling aging process of a supergravity reaction are performed in different reactors, so the processesof crystal nucleus generation and crystal nucleus growth are separated; through adjustment of parameters of temperature, time and stirring degree in bubbling aging, the environment of crystal nucleusgrowth is controlled; and preferably, nanoscale or submicron iron oxyhydroxide can be prepared, and has the characteristics of small average particle size, large specific surface area and uniform particle size distribution.
Owner:FUZHOU UNIV +1

Laminating device and integrated die laminating device

The invention discloses a laminating device. The laminating device comprises a diaphragm conveying mechanism for discharging and conveying rolled diaphragms; a positive electrode feeding mechanism which is used for continuously conveying single positive electrode plates; a negative electrode feeding mechanism which is used for continuously conveying single negative electrode plates; a laminating mechanism which reciprocates between the positive electrode feeding mechanism and the negative electrode feeding mechanism and receives the diaphragms, the positive electrode plates and the negative electrode plates, so that the diaphragms are pressed on the laminating mechanism and then move along with the laminating mechanism to form a Z-shaped diaphragm, wherein the positive electrode plates andthe negative electrode plates are alternately laminated on the Z-shaped diaphragm to form a Z-shaped laminated sheet; a diaphragm cutting mechanism which is used for cutting off the diaphragm supplyof the diaphragm conveying mechanism to the laminating mechanism after the laminating mechanism finishes laminating; and a rubberizing mechanism which is used for rubberizing the Z-shaped laminated sheet to form a battery cell. The defects of low speed and high labor intensity of manual feeding are overcome, the production cost is reduced, the lamination efficiency is improved, and modern automatic production integrated with die cutting and lamination is realized.
Owner:哈工大机器人(中山)无人装备与人工智能研究院

A moving target motion track prediction method based on hyper-spectrum and an autonomous tracking method

PendingCN109712169ARealize autonomous tracking measurementOvercome widthImage analysisColor/spectral properties measurementsComputer visionOrbit
The invention relates to a moving target motion track prediction method and an autonomous tracking method based on hyper-spectrum, and the method comprises the steps: carrying out the rapid hyper-spectrum abnormity detection of the hyper-spectrum detection data of a target prediction region through an on-orbit real-time processor, and determining the possible position of a target according to a detection result; according to the obtained possible position of the target, fitting the movement track of the associated target by adopting a least square curve method, removing the movement position of the false alarm target, and determining the real position of the current target; and according to the determined current target position, fitting the associated target motion track by adopting a least square curve method, and predicting the possible position of the target at the next moment according to the target motion track. The hyperspectral-based moving target motion track prediction methodis adopted, the problems that the scanning breadth and the scanning rate are insufficient when a hyperspectral imager conducts autonomous tracking on a moving target are solved, and autonomous tracking measurement on the moving target is achieved.
Owner:SHANGHAI SATELLITE ENG INST

Novel cryo-scanning electron microscope sample table and sampling method

The invention discloses a novel cryo-scanning electron microscope sample table, which comprises a base, lower sample tubes and upper sample tubes, wherein a plurality of sample mounting grooves are formed in the base and vertically penetrate through the upper side surface and the lower side surface of the base; the lower sample tubes and the upper sample tubes are identical in size and matched innumber, the flat ends of the lower sample tubes and the flat ends of the upper sample tubes are in butt joint pairwise and then inserted into the sample mounting grooves, and the inner diameter of theupper ends of the sample mounting grooves is smaller than the outer diameter of the flat ends of the lower sample tubes; and the base is further provided with an adapter for transferring the base toa cooling table in a sample preparation cabin of a freezing transmission system and realizing fixation. The novel cryo-scanning electron microscope sample table is suitable for scanning electron microscope observation and analysis of various liquid, semi-liquid or foam samples, and has the advantages of simple structure and convenience in use and operation; the samples are directly in contact witha refrigerant, the freezing rate is high, and the generation of ice crystals is avoided or reduced; and a plurality of samples are simultaneously introduced, so that the working efficiency is high and the applicability is wide.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI

A bridge crane reliability optimization design method

The invention discloses a bridge crane reliability optimization design method which comprises the following steps: S1, defining uncertain structure parameters in a crane, and describing the uncertainparameters as interval variables; S2, establishing a limit state function according to the structural failure form, and solving a reliability index in the optimization model by adopting a Vparalove function in MATLAB based on an interval analysis method; S3, introducing a non-probabilistic reliability index, and establishing a non-probabilistic reliability optimization design model by taking a given required reliability index as a constraint condition; S4, solving an optimization problem;. According to the method, the reliability index can be effectively, quickly and accurately solved; Secondly, the common defects of low iteration rate, low optimization precision, large storage space and the like of an optimization algorithm in the actual solving process are considered; On the basis of researching a traditional moth flame algorithm, the method is effectively improved, and the convergence rate and the convergence precision of the outer layer optimizer are remarkably improved. And the method has an important value in structural reliability optimization design in engineering practice.
Owner:ZHUZHOU TIANQIAO CRANE

Unmanned aerial vehicle testing platform

The invention relates to the technical field of unmanned aerial vehicles and discloses an unmanned aerial vehicle testing platform. The unmanned aerial vehicle testing platform comprises a flange plate, a rotating bearing, a base and a conductive slip ring. A mounting hole is formed in the flange plate and used for mounting an unmanned aerial vehicle; the flange plate is rotationally mounted on the base through the rotating bearing; the conductive slip ring comprises a rotor end and a stator end; and the rotor end is electrically connected with the unmanned aerial vehicle; and the stator end is connected with the base. Through the rotating of the rotating bearing, degree of freedom needed to test yawing movement is provided for the unmanned aerial vehicle; the unmanned aerial vehicle is inwire connection with a power supply and signal receiving device through the conductive slip ring so that the unmanned aerial vehicle gets rid of limitation of limited battery capacity and overcomes defects that the wireless transmission speed is low and the unmanned aerial vehicle is easy to be interfered; and therefore, the unmanned aerial vehicle can efficiently and accurately transmit and receive information; and the rotor end and the stator end of the conductive slip ring can relatively rotate to avoid bending distortion of a transmission lead. According to the unmanned aerial vehicle testing platform, an efficient and reliable testing platform is provided for the yawing movement of the unmanned aerial vehicle; and moreover, the structure is simple, the operation is convenient, and the practicability is very high.
Owner:WUHAN UNIV OF SCI & TECH

Method for strengthening short-cut nitrification reactor by embedded cathode dynamic membrane

The invention relates to a method for strengthening a short-cut nitrification reactor by an embedded cathode dynamic membrane. The method comprises the following steps: preparing a continuous flow reactor, successfully domesticated short-cut nitrification sludge, a dynamic membrane assembly, an iron plate, an electrochemical workstation, a water inlet tank, a peristaltic pump, an aeration pump, a differential pressure gauge and a water outlet pump; installing the dynamic membrane assembly in the continuous flow reactor, adopting a stainless steel lining as a cathode in the dynamic membrane assembly, adopting the iron plate as an anode, and respectively connecting the cathode and the anode with the electrochemical workstation; arranging the aeration pump in the continuous flow reactor, and adding the short-cut nitrification sludge; enabling the continuous flow reactor to operate in a continuous water inlet mode, controlling high ammonia nitrogen load and low dissolved oxygen concentration of inlet water, performing intermittent aeration in different periods, and controlling the aeration intensity; and enhancing the operation effect of the reactor by combining an electrochemical means of controlling current and electrifying time, increasing the content of bacteria related to short-cut nitrification, and reducing the membrane pollution rate. The method is beneficial to reducing the membrane pollution rate and prolonging the membrane operation cycle.
Owner:福建省环境科学研究院福建省排污权储备和技术中心

Remote sensing image weak and small target fusion multi-level feature target detection method

The invention relates to a remote sensing image weak and small target fusion multi-level feature target detection method, and the method improves the detection precision of a remote sensing image weak and small target through an end-to-end target detection network based on a convolutional neural network and the multi-level features of the remote sensing image weak and small target. The invention provides a detection method for weak and small targets based on the characteristics of small size, such as dozens of pixels and weak characteristics of the weak and small targets of remote sensing images in actual engineering. According to the method, target features are extracted layer by layer through a convolutional neural network, cross-level channel fusion target features, position attention mechanism aggregation target features and double-branch feature map prediction targets are performed, and an end-to-end target detection network is formed, so that the purpose of performing high-precision and high-speed detection on weak and small targets in remote sensing images is achieved. Experiments show that the recall ratio and precision ratio of remote sensing image weak and small target detection can be effectively improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Live television and multimedia information publishing system and method

The invention discloses a live television and multimedia information publishing system and method, and the system comprises DTMB receiving equipment, signal conversion equipment, an information publishing terminal, and a cloud server. The output end of the DTMB receiving equipment is connected with the signal conversion equipment; the output end of the signal conversion equipment is connected withthe information publishing terminal; the cloud server is connected with the signal conversion equipment; the signal conversion device communicates with the information publishing terminal in a WIFI mode. Meanwhile, the invention further discloses a live television and a multimedia information publishing method. According to the invention, WIFI communication is set between the signal conversion equipment and the information publishing terminal, and fourth-generation communication or higher-level wireless transmission standard communication is set between the cloud server and the signal conversion equipment. The technical problems of low live television information and multimedia information transmission rate, complex wiring process and high cost in the prior art are solved, and the beneficial effects of high transmission rate, easy wiring operation and low cost are achieved.
Owner:深圳城视互联科技有限公司

Wireless real-time transmission node type seismograph system and synchronous calibration method

The invention relates to a wireless real-time transmission node type seismograph system, which comprises at least one first-level acquisition network, a second-level network wireless control host and a control terminal which are connected in series, and is characterized in that each first-level acquisition network comprises a first-level network wireless control host and a plurality of wireless node instruments connected with the first-level network wireless control host; and after the second-level network wireless control host collects data collected by the first-level network wireless control hosts, the data are forwarded to the control terminal in real time through a high-speed network interface of the second-level network wireless control host, and the control terminal displays and stores seismic data in real time. The invention also designs a method for carrying out synchronous calibration by adopting the wireless real-time transmission node type seismograph system. According to the wireless real-time transmission node type seismograph system and the wireless real-time transmission node type seismograph system, the application range and the construction efficiency of a wireless seismic acquisition system are greatly improved, and wireless real-time acquisition and transmission of seismic data are realized.
Owner:湖南奥成科技有限公司

High-frame-rate video SAR (Synthetic Aperture Radar) real-time imaging processing device and method

The invention discloses a high-frame-rate video SAR (Synthetic Aperture Radar) real-time imaging processing device and method, and the method comprises the steps: generating an intermediate frequency analog signal, and processing the intermediate frequency analog signal to obtain a transmitting signal; performing down-conversion processing and signal acquisition preprocessing on the echo signal to obtain a zero-intermediate-frequency baseband signal; the signal is divided into two paths of same data, one path is used for data storage, and the other path is used for real-time imaging processing; and the real-time signal processing module receives a path of zero intermediate frequency baseband signal, and the signal is subjected to range direction FFT, range direction dechirp, range-Doppler algorithm, motion error estimation and compensation processing to obtain a real-time imaging result. According to the high-frame-rate video SAR real-time imaging processing device and method, in the signal processing process, parallel processing is adopted for algorithms, hardware system design is optimized at the same time, the correctness of algorithm processing and the high efficiency of division are guaranteed, the algorithm is matched with a hardware system, and the real-time imaging processing efficiency is improved. And a basis is provided for airborne and satellite-borne real-time imaging of the video SAR and subsequent target detection and tracking.
Owner:XIDIAN UNIV
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