614results about How to "Achieve capture" patented technology

The invention provides a measuring device and method for the target line-of-sight angel offset and distance. The device is composed of a four-quadrant avalanche photodetector, a receiving and sending optical unit, a noise compensation circuit, a four-circuit front amplification circuit, a video amplification circuit, an automatic gain amplification circuit, a peak keeping circuit, an AD conversion circuit, a laser, a dominant wave sampling circuit, a summing circuit, a time identifying circuit, a time test circuit and a digital processing circuit, wherein the receiving and sending optical unit enables narrow pulse laser rays emitted by the laser to be converged on the photoelectric detector to form echo light spots after target reflection, photovoltaic conversion of the four-quadrant avalanche photodetector, front amplification, video amplification and automatic gain amplification are conducted, narrow-pulse peak keeping is conducted, transmission of the AD conversion circuit is conducted, and the digital processing circuit extracts the digital line-of-sight angel offset; summing is conducted on the four-circuit front amplification circuit, the dominant wave sampling circuit is combined, the time identifying circuit determines laser emitting and echo coming and returning time, the time is transmitted to the time identifying circuit to be measured, and the digital processing circuit decodes the corresponding distance.

The invention is directed to a heart stimulator for left-ventricular pacing comprising a left ventricular stimulation pulse generator connected or connectable to a single electrode lead for left ventricular stimulation having one or more electrodes for delivery of stimulation pulses to left ventricular myocardial heart tissue, said stimulation pulse generator being adapted to generate and deliver stimulation pulses of switchable polarity. The heart stimulator further comprises a control unit connected to the stimulation pulse generator for controlling the stimulation pulse generator and to trigger generation and delivery of stimulation pulses having a polarity controlled by said control unit, wherein the control unit is adapted to control said left ventricular stimulation pulse generator so as to deliver at least a pair of suprathreshold stimulation pulses of opposite polarity.

The invention discloses a time sequence and CNN-based unsafe behavior identification method and system. The method comprises the steps of inputting original data of a training set video of unsafe behaviors to a CNN for performing training and learning, and outputting a spatial eigenvector from the last pooling layer of the CNN; taking the spatial eigenvector as an input of a time recurrent neuralnetwork, learning a time sequence dependency relationship contained in the spatial eigenvector by using the time recurrent neural network to learn a time sequence representation of spatial behaviors,and obtaining an average pooling eigenvector; inputting the average pooling eigenvector to a softmax layer, thereby obtaining a deep mixed learning model of the CNN and the time recurrent neural network, namely, a softmax classifier; and performing online identification on a monitoring video of a construction site by utilizing the softmax classifier to obtain the unsafe behaviors of the construction site. The support can be provided for real-time investigation and correction of the unsafe behaviors in a whole building engineering construction process.

The invention provides an optical micro-hand based on a three-core fiber and a method for preparing the same. The fiber comprises a three-core fiber and a single-core fiber which is in coupled connection with the rear of the three-core fiber and the connection between the three-core fiber and the single-core fiber is realized by applying heating, fusing and tapering the welding point after welding. The other end of the three-core fiber is made into a cone by sintering at the sharp end after grinding or heating the ends of the fiber and applying fusing and tapering. Aiming at the defect and deficiency in the prior art, the optical micro-hand discloses an optical micro-hand based on a three-core fiber which can form a cross combination light field by grinding or tapering the ends of the fiber based on the three-core fiber by making use of the joint action among external refraction, internal reflection and external refraction as well as a cone gradual wave guide and further form a three dimensional gradient force potential trough at the convergence point of combination light fields so as to realize three dimensional trapping of tiny particles.

The invention relates to a malicious program behavior capture method based on the Qemu. The method is characterized in that a malicious program behavior capture module is directly inserted into a source code of the Qemu, a client operating system is installed on the Qemu, and then behavior capture is carried out on malicious program samples on the client operating system through the malicious program behavior capture module running in the Qemu. The method has the advantages that the malicious program behavior capture module is directly inserted into the source code of the Qemu, completely isolated from the samples running on the client operating system and located on the lower layer of the operating system, and in theory, the malicious program samples can not detect or escape the malicious program behavior capture module easily.

The invention discloses an indoor passive positioning method based on geographic fingerprints. The method is applied to the technical field of indoor positioning and comprises: in a situation that a mobile terminal is in an off-line state, collecting a received signal strength (RSS) value of each reference point where the mobile terminal is by utilizing an access point device; calculating a prior probability that the access point device collects the RSS values in a period; establishing a geographic fingerprint database according to a coordinate position of each reference point, the RSS values and the prior probability; when the mobile terminal is in an on-line state, testing an RSS value of each test point where the mobile terminal is; matching the test points with reference points in the geographic fingerprint database based on a prior probability nearest neighbor algorithm according to the RSS value at each test point where the mobile terminal is; and determining the positioning position of the mobile terminal. According to the invention, the prior probability is applied to the K-nearest neighbor algorithm for positioning, and the positioning accuracy is improved at the same time and space complexity.

The invention provides a DNA tetrahedral nano-structure signal probe. The signal probe is a DNA signal probe having a tetrahedral base, wherein the signal probe is formed by self-assembling single-stranded DNA of a DNA recognition sequence extending from 5' end and single-stranded DNA of three chains with 5' ends modified with labeled molecule; the DNA recognition sequence extends from a vertex of the tetrahedral structure, the DNA recognition sequence is complementarily combined with to-be-detected target DNA or miRNA, and other three vertexes, due to the labeled molecules, are specifically combined with modified signaling modules, so as to achieve multi-signal amplification. The signal probe disclosed by the invention greatly improves the sensitivity of the target DNA or miRNA subjected to electrochemical detection, and a limit of detection can be as low as 1fM.

The invention provides a bidirectional four-beam liquid crystal optical phased-array antenna and realizes a liquid crystal phased multi-user space bidirectional laser communication method based on the antenna. According to the antenna, large-angle deflection control is performed by adopting the combination of a transmission type liquid crystal polarization grating and a transmission type liquid crystal optical phased array, so as to realize beam scanning, and high-precision beam deflection control is performed through liquid crystal optical wedge control beams, so as to realize high-precision beam tracking. According to the bidirectional four-beam liquid crystal optical phased-array antenna and the liquid crystal phased multi-user space bidirectional laser communication method, linearly polarized beams of which two polarization directions are mutually perpendicular are independently controlled by adopting two parallel liquid crystal optical phased-array antennae, and receiving and sending separation of the same user optical signal is realized by adopting a circular polarization right-and-left spin multiplexing and liquid crystal optical phase combined method, so that multiuser bidirectional communication can be realized, and single-user polarization multiplexing communication also can be realized.

The invention discloses an acquisition system and method for high data rate direct sequence spread spectrum signals under a large Doppler dynamic condition. A coarse acquisition based on symbol jump edge detection, and a precision controllable Doppler spectrum analysis are employed in the method. The coarse acquisition based on symbol jump edge detection can acquire data symbol jump edge positions, pseudo code phases and primary Doppler frequency offset estimates of the direct sequence spread spectrum signals. Coarse acquisition results are verified through the spectrum analysis, and a final Doppler frequency offset estimation whose accuracy is lower than dozens of Hertz is obtained, so that requirements on tracking loops are significantly reduced. By employing the method, the high data rate direct sequence spread spectrum signals with low signal-to-noise ratios under the large Doppler dynamic condition can be rapidly acquired.

The invention discloses an air vehicle capturing, connecting and separating device. The air vehicle capturing, connecting and separating device comprises an active unit and a passive unit. The active unit comprises a shell, a motor, a sliding lead screw and at least two capturing claws. The motor drives the sliding lead screw to rotate so that reverse motion of a nut and the capturing claws can be achieved. The passive unit comprises a passive part, a guiding rod and a pressing plate. The guiding rod is connected between the passive part and the pressing plate. The pressing plate slides on the guiding rod. Through the electric-driven hinged capturing claws, capturing, connecting and separating of air vehicles are achieved, and the air vehicle capturing, connecting and separating device has the advantages of being large in capturing range, simple in mechanism structure, low in mass and the like.

The invention relates to a method for forming and capturing liquid drops based on a three-layer sandwich disc-type chip and application thereof, wherein the chip with a geometric micro-structure and consisting of a main channel, a side channel and a capturing area is designed and uses the difference of the surface tension in the channels with different widths to induce the in-situ formation and capture of the liquid drops. The method has the following advantages that: the in-situ formation and capture of the liquid drops is achieved by using a simple structure; the formation of the liquid drops does not need a surfactant to prevent the surfactant from influencing the reactions in the liquid drops; the formation of the liquid drops is not influenced by channel surface properties so that oil-in-water liquid drops can be achieved on an unmodified PDMS chip; the formation of the liquid drops does not need precise control of the fluid flow rate, and the flowage of the fluid adopts a liquid storage tank vacuumizing mode to avoid using a precise injection pump and reduce the experimental cost; and the captured liquid drops are used as array micro-reactors to achieve the chemical reactions of gas-liquid two phases in the liquid drops for the first time.

The invention discloses a metal particle trap for a direct-current gas-insulated power transmission line. The metal particle trap is composed of a driving electrode and a metal particle trapping groove. A direct-current GIL aluminum alloy conductor and a pillar insulator for a direct current GIL are arranged inside a direct-current GIL aluminum alloy shell. The driving electrode is installed nearby the pillar insulator for the direct-current GIL on the direct-current GIL aluminum alloy conductor. The metal particle trapping groove is installed inside a direct-current GIL cavity, so that the inclined face of the driving electrode faces the bottom metal particle trapping groove. The metal particle trapping groove comprises three layers which are the inward-concave type metal shielding groove, an epoxy resin insulation pad and the high-viscidity hot melt adhesive coating in sequence from bottom to top. The metal particle trapping groove is used for capturing and limiting particles, the inward-concave type metal shielding groove in the bottommost layer generates a low electric field area, the epoxy resin insulation pad on the middle layer coats the whole bottom of the inward-concave type metal shielding groove, and the high-viscidity hot melt adhesive coating on the uppermost layer can control and trap particles moving at a high speed.

The invention discloses a multiple access method based on an optical two-dimensional code. The method includes the following steps that firstly, a base-band modulation signal is formed; secondly, a spread spectrum signal is formed; thirdly, the spread spectrum signal drives an LED lamp to send out a two-dimensional code sequence through an LED drive circuit; fourthly, the optical two-dimensional code is recognized and captured to form an image signal; fifthly, a binary digital signal is formed; sixthly, an original optical two-dimensional code information stream is restored through the binary digital signal; seventhly, information is pushed in real time. A visible light communication system of the multiple access method based on the optical two-dimensional code comprises an emission subsystem, a transmission subsystem, a receiving subsystem and a service cloud platform. The emission subsystem is provided with an OOK base-band modulation module, a CDMA encoding module, the LED drive circuit and the LED lamp. The system has the advantages that transmission content of visible light communication can be updated in real time, and corresponding information is pushed according to different application places.

The invention discloses a self-adaptive simulative method of dam break flood on a complex border and an actual landform. The method comprises the step of shifting a deformed GRP format with partial differential equation and a self-adaptive grid based on variation principle; the former one resolves aextended riemann problem through boundary method, thus the numerical flux for the deformed PED includes the influence of a riverbed bottom part; the source item of a centre discrete also includes the influence on the flow field; the static flow is precisely ensured on an unstructured triangular grid; the later one realizes the adjustment of the grid position, realizes the conservation interpolation of the physical quantity on the new grid, thereby improving the approaching degree of the unstructured triangular grid for physical quantity and ensuring the static flow. The method developed in the invention can effectively improve the resolution ratio, the calculation precision and the calculation efficiency when the shallow-water wave is simulated, thereby providing a new technical scheme for simulating the hydrodynamic force and eutrophication process of the break dam flood.

In order to solve a problem that the existing mechanical state simulation of a space target cannot realize tasks of effective spin counteraction of the target and multiple repeated trapping of the target, the invention provides a ground physical simulation experiment system for space spinning target trapping and spin counteraction and belongs to the field of ground zero-gravity simulations of space operation systems and space targets. According to the ground physical simulation experiment system for space spinning target trapping and spin counteraction, the space target spinning state is simulated by using a six-degree-of-freedom simulator; the six-degree-of-freedom motion and zero-gravity state of a service aircraft are simulated by using air flotation and air injection; a six-degree-of-freedom mechanical arm carries a spinning tracking claw device to track and trap the spin angle velocity and spin axis of the spinning space target; angular momentum in the trapping process is transmitted to the service aircraft; and reverse air jet is adopted to perform spin counteraction. The structure of the ground physical simulation experiment system for space spinning target trapping and spincounteraction has the advantages that effective spin counteraction can be realized, trapping and spin counteraction can be integrated and the target can be repeatedly trapped for multiple times.

The invention belongs to the field of radio navigation location technology and especially relates to a Beidou terminal signal receiving and processing device and method. The device includes an antenna unit, a radio frequency unit, a baseband signal processing unit, an information processing unit, a power unit and a display control unit connected successively. The method includes capturing fake satellites and satellites respectively by adopting a storage-based baseband capturing method; receiving fake satellite signals and real satellite signals for fake satellite and satellite information decoding; performing updating operation on extracted navigation parameters; extracting carrier phase, code phase and Doppler observation information and performing calculation on location, speed measurement and time service. According to the invention, by the design of an integrated antenna receiving the satellite signals and the fake satellite signals and a radio frequency front end and with the adoption of an algorithm realizing seamless positioning depending on independent positioning and compatible positioning for solving a problem of near-far effect of the two kinds of signals, constellation geometric structure is improved and user positioning precision is improved.

The invention provides a relative navigation close range tracking method and system for space noncooperative target capturing. According to the relative navigation close range tracking method and system for space noncooperative target capturing, a kinematical equation of a free-floating space robot system is utilized to deduce and obtain a path planning method for a mechanical arm capturing a moving target, the relative speed and relative posture of the tail end of the mechanical arm and the target are taken as input, joint angle commands controlling the mechanical arm to move can be calculated and obtained, so that capturing operations of the mechanical arm on the moving target can be realized. By means of the relative navigation close range tracking method, in the process of close rangerelative navigation of a space robot on the moving noncooperative target, path planning for the relative position and posture of the tail end of the mechanical arm and the target and continuous inverse kinematics solution from Cartesian space to mechanical arm joint space can be independently realized, and especially for redundant mechanical arms, posture undisturbed planning for a base seat relative to inertial space can be realized.

The invention discloses a wireless laser communication reflection type aiming tracking system and a laser aiming tracking method. A controller is controlled to control pitch and horizontal motion of atwo-dimensional rotating reflection mirror; a laser transmitted by the wireless laser communication transmitting end is reflected into an optical receiving antenna; the optical receiving antenna focus the later into a small facula, and the small facula hits a four-quadrant detectorin the optical receiving antenna; the four-quadrant detector output corresponding voltage to a control processor, andthe control processor controls pitch and horizontal motion of the reflection mirror based on the received voltage until the facula hits in a small hole at the center of the four-quadrant detector; acoupling fiber is fixed to the center through hole of the four-quadrant detector, and when the facula enters the center through hole, a laser signal transmitted by the transmitting end can be coupledinto the fiber; and the fiber is used for transmitting the laser signal to sequential signal processing portion, and establishment of wireless laser communication link is achieved. The aim of the APTsystem establishes the wireless laser communication link in a short time is achieved.

The invention discloses an intelligent lock system. The intelligent lock system comprises an intelligent key, a lock core and a power control module, wherein the intelligent key comprises an optical signal emitting module for emitting an optical signal, a first storage module for presetting an unlocking password, a control module for driving the optical signal emitting module to emit the optical signal according to the unlocking password, and a power module for supplying power to above modules; the lock core receives the optical signal and judges whether to unlock the intelligent lock according to the optical signal; and when the intelligent key is inserted into the lock core and matched with the lock core, the power control module starts the power module. The unlocking function is achieved in an optical communication way, and the transmission rate is as high as GBps; during optical communication, data is transmitted by visible light and the data is not suitable to be interfered and captured; optical communication equipment is easy to manufacture and unlikely to be damaged or demagnetized; and a power switch of the intelligent lock system is triggered in a way similar to an unlocking way of a mechanical lock system, so that the intelligent lock system is relatively good in concealment and relatively convenient to use.

The invention relates to a preparation method of sulfur carbon nano composite material absorbent and application of the absorbent in recovery of heavy metal from a liquid phase or a gas phase. The preparation method of the absorbent comprises the following steps: fully stirring and mixing active carbon and sulfur substance in water by a vortex friction mixing method; and introducing molten-state sulfur substance on the surface in the pore canal of the active carbon particle by a melt infiltration method. In the sulfur carbon nano composite material, the sulfur substance is evenly attached on the surface and in pore canal of the active carbon material particle in an amorphous thin coating form. The sulfur carbon nano composite material has the remarkable characteristics of very large active specific surface area. The absorption principle is that a nano-thin layer of sulfur substance is used as a metal capture agent and a particle containing heavy metal, or steam, liquid drop and ion containing heavy metal to form a certain chemical action, and thereby the application that the heavy metal can be absorbed from the liquid phase and the gas phase can be realized.

The invention relates to a tidal current energy electricity generation device which comprises an engine room, an electric generator, a tower, a current speed and direction sensor, a controller, a first brake, a second brake, a first impeller and a second impeller. The engine room is fixed on the tower, the first impeller and the second impeller are arranged at the two ends of the engine room respectively, a rotating shaft of the first impeller stretches into the room engine and is in linkage with an inner rotor of the electric generator, a rotating shaft of the second impeller stretches into the engine room and is in linkage with an outer rotor of the electric generator, the first brake is arranged at the position of an input rotating shaft of the inner rotor, the second brake is arranged at the position of an input rotating shaft of the outer rotor, and the controller is respectively and electrically connected with the current speed and direction sensor, the first brake and the second brake. A control method of the tidal current energy electricity generation device comprises the steps of controlling the brake state of the first brake and the brake state of the second brake according to a tidal current speed signal and a tidal current direction signal detected by the current speed and direction sensor, and achieving the aim of capturing the tidal current energy in forward and reverse tidal currents. According to the tidal current energy electricity generation device, a variable pitch or yaw mechanism is eliminated, the structure is simple, the cost is saved, a control program is simple, and the control precision and the energy utilization rate are improved.

Technical scheme of the invention is as following: direction-finder antenna (DFA) captures signal of public channel in forward direction (FD) of service base station of CDMA mobile target; communication module (CM) constructs target reference signal based on content message body in public channel in FD; dumb call module carries out dumb calling to target terminal to be positioned; DFA captures reverse access signal (RAS); CM decodes the access signal based on constructed reference signal, and captures ID number of mobile user in message body of RAS; control process unit determines ID of mobile target (MT) to be measured, and carries out estimating positional parameter; the position calculation module computes position of target, and further accomplishes relative positioning tracking for MT to be measured. Features are: flexible and convenient, high real time and validity etc. The method is suitable for positioning operation at mountainous area and place with dense buildings.

The invention discloses an air-based space fragment optical detection and tracking system and method. The system comprises a large-view-field telescope, a small-view-field telescope, a laser range finding machine, and a holder. The method comprises the steps: capturing a rough azimuth angle and a pitch angle of a target through the large-view-field telescope; capturing a precise azimuth angle and a pitch angle of the target through the small-view-field telescope; and measuring the distance with the target through the laser range finding machine. The system employs a passive imaging and laser range finding combination system which consists of the large-view-field telescope, the small-view-field telescope and the laser range finding machine, achieves finding, capturing and tracking of small objects in space through the technology of optical imaging, overcomes the limit that a laser radar is difficult to detect small objects, is low in system power consumption, can quickly and precisely detect the distance and azimuth of the target, and is long in detection distance.