35results about How to "Little effect of occlusion" patented technology

A high-isolation slot antenna array relates to a multi-input multi-output antenna. The antenna is composed of three slot antennas which are arranged together, the radiation polarization directions of every two slot antennas intersect, and each slot antenna is formed by a micro-strip feeder on a dielectric substrate and a metal ground plane. A radiation slit and a plurality of isolation slots are formed in the metal ground plane. The isolation slots are formed in the periphery of the radiation slit, and the isolation slots are parallel to each other. The long side direction of the radiation slit is perpendicular to the long side direction of the isolation slots, and the length of the isolation slots enables the resonance frequency to be lower than the working efficiency of the antennas. An antenna input output port is formed in one end of the micro-strip feeder, a metal short circuit needle is arranged at the tail end of a micro-strip feeder conduction band at the other end of the micro-strip feeder, and the conduction band and the metal ground plane are connected on the edge of the radiation slit through the metal short circuit needle. The antenna can effectively reduce adverse effects of shielding and isolation of the metal ground plane on antenna normal radiation.

The invention discloses a high-isolation semi-groove slot antenna array, and relates to a multiple-input-multiple-output antenna. The antenna array consists of three semi-groove slot antennas which are placed together and are pairwise orthogonal in radiating polarization directions, wherein each semi-groove slot antenna consists of a microstrip feeder line on a medium substrate, and a metal ground surface; a radiating semi-groove slot and a plurality of isolation slots are formed in each metal ground surface; the radiating semi-groove slots are rectangular; one end of each radiating semi-groove slot is short-circuit; the other end of each radiating semi-groove slot is open-circuit; the isolation slots around the radiating semi-groove slots are mutually parallel; long side directions of the radiating semi-groove slots are perpendicular to long side directions of the isolation slots; the resonant frequency of the isolation slot is lower than the working frequency of the antennas; one end of each microstrip feeder line is an input-output port of each antenna; and metal short-circuit pins are arranged at the tail ends of microstrip feeder line conduction bands at the other ends of the microstrip feeder lines, and connect the conduction bands and the metal ground surfaces on the edges of the radiating semi-groove slots. The antenna array can effectively reduce adverse effects of the metal ground surfaces on shielding and isolation of normal radiation of the antennas.

The invention relates to the technical field of medical image processing, in particular to a focus tracking method under a digestive endoscope based on sequential feature learning, which comprises thefollowing steps: collecting lesion video clips as training samples, and constructing and training a tracking model based on a convolutional neural network, a long short-term memory network and an optical flow vector diagram; acquiring network model parameters, acquiring a digestive endoscopy real-time examination video, deframing the digestive endoscopy real-time examination video into pictures,calculating optical flow vector diagrams of two adjacent frames of images, loading a network structure and model parameters based on a convolutional neural network, a long short-term memory network and the optical flow vector diagrams, and calculating the area and position of a focus in real time. By means of the method, the area and the position of the focus can be tracked in real time in the digestive endoscopy process for endoscopy doctors to refer to, and the situation that the focus area is lost due to illumination, angles, shielding and other reasons in the examination process can be effectively prevented. The detection and tracking capacity of the focus under the digestive endoscopy can be improved, and the examination quality of the digestive endoscopy is effectively improved.

The invention relates to the field of a software application and specifically relates to a live broadcast video output control method and device, a computer readable memory medium and a terminal. Themethod comprises the steps of receiving an editing instruction of a user for a window control and storing the window control; in response to a broadcast start instruction of the user, intercepting screen images of the terminal as original frames of a live broadcast video, wherein the original frames of the live broadcast video do not comprise the window control; overlapping the window control intothe original frames of the live broadcast video, and synthesizing stream push frames of the live broadcast video; and generating a live broadcast video stream according to the stream push frames of the live broadcast video, and pushing the live broadcast video stream. According to the solution provided by the invention, when screen record live broadcast is carried out at a mobile end, self-defined content is added without influencing a watching effect of a user on the terminal screen and the operation on the terminal screen.

The invention discloses a communication method, device and system of an auto-piloted fleet, so as to solve the technical problem that in the prior art, the reliability of vehicle-vehicle communications in the auto-piloted fleet is poor. A DSRC (dedicated short range communications) and VLC (visible light communications) are arranged on each vehicle in the auto-piloted fleet. The communication method comprises the following steps of monitoring the available conditions of the DSRC and the VLC of all the vehicles in the auto-piloted fleet by a master control vehicle; if the situation that the DSRC of all the vehicles are available is monitored, controlling all the vehicles to transmit vehicle travelling information through the corresponding own DSRC; and if the situation that the DSRC of a part of the vehicles or all the vehicles are not available and the VLC of all the vehicles are available is monitored, controlling all the vehicles to transmit the vehicle travelling information throughthe corresponding own VLC. Through the adoption of the technical scheme of the communication method disclosed by the invention, the reliability and the success rate of the vehicle-vehicle communications in the auto-piloted fleet can be improved.

The invention provides a log periodic feed source array based on spaceborne multi-beam antenna space three-dimensional structure layout. The log periodic feed source array is composed of five groups of high-frequency feed units, four groups of low-frequency feed units and a composite material supporting component. The mutual coupling influence on electrical performance of the feed source array between antennas can be reduced to the largest extent through three-dimensional structure layout and unit array distribution optimization under the requirement of spaceborne limited space layout so that the multi-beam coverage requirement of broadband and high gain of the antennas can be realized; the units and the supporting component are simple in structural form and high in reliability so that great rigidity-to-gravity requirement of the feed source array can be realized; and the special composite material and ingenious structural design are adopted, shielding influence of the supporting component on the electrical performance of the formed high-frequency and low-frequency feed units is enabled to be minimized under the condition of meeting the main structural strength of the feed source array, and the space environmental requirements can also be met.

The invention discloses a self-driving fleet communication method and device, and solves the technical problems of poor reliability of vehicle-vehicle communication in the self-driving fleet in the prior art. According to the self-driving fleet communication method and device, a DSRC and a VLC are arranged on each vehicle of the self-driving fleet. The method comprises the steps that the availablestate of the DSRC and the VLC of the vehicle is monitored; when the DSRC is monitored to be available, vehicle driving information is transmitted through the DSRC of the vehicle; and when the DSRC ismonitored to be unavailable and the VLC is monitored to the available, the vehicle driving information is transmitted through the VLC of the vehicle. With application of the technical scheme, the reliability and the success rate of vehicle-vehicle communication in the self-driving fleet can be enhanced.

The invention relates to the field of offshore wind and power, in particular to an offshore cluster floating type wind and power comprehensive utilization platform. The offshore cluster floating typewind and power comprehensive utilization platform comprises a photovoltaic platform and fans. The photovoltaic platform is provided with a photovoltaic power generation system, the photovoltaic platform is connected with a center floating cylinder through a floating supporting platform, multiple connecting blocks are evenly distributed in the circumferential direction of the center floating cylinder, the connecting blocks are connected with a seabed anchorage foundation through a mooring cable, the multiple fans can be interconnected into a whole, the whole system reliability can be improved,meanwhile, the photovoltaic power generation system is arranged on the center area of the cluster floating type platform, the whole incomes of the platform are increased, meanwhile, the sheltering influence of wind and power on center photovoltaic power generation can be reduced, and losses caused by local shade and heat spots can be reduced. In considering of like of different kinds of fish for sunlight, different kinds of fish can be arranged on different areas on the platform, and the yield and incomes of fishery culture can be improved to the maximum degree.

The invention discloses a dynamic three-dimensional speed measurement system and method based on a UWB technology. The system comprises a positioning base station, a positioning label and a speed calculation system. Through high-frequency refreshing, distance measurement and unified time service, the real-time speeds of a moving target in three dimensions in a moving process are given; the speedsof the moving target in different time periods can be given according to different time granularities; and engineering application and experimental measurement are better facilitated, particularly forthe moving target of which the speed changes drastically and moves at a high speed. By means of the high-precision distance measurement characteristic of the UWB, base stations and labels are flexibly deployed according to different experiment speed measurement scenes, the real-time speed of the moving target is measured, and application scenes are not affected by indoor and outdoor scenes and weather.

The invention discloses a vehicle-mounted airport for an unmanned aerial vehicle and a control method of the vehicle-mounted airport. The vehicle-mounted airport for the unmanned aerial vehicle comprises a mainframe box, a main controller, a power supply battery, a power management module, an unmanned aerial vehicle charging base, a side case, an antenna device and a retracting and releasing device, wherein the main controller, the power management module, the power supply battery and the unmanned aerial vehicle charging base are all installed in the mainframe box; the side case is mounted atthe upper part of the back of the mainframe box; an avoidance space is formed between the bottom and the horizontal plane of the bottom edge of the back of the mainframe box; the retracting and releasing device is used for retracting and releasing the antenna device and comprises an overturning device and a telescopic device; the telescopic device is installed in the side case, the fixed end is hinged to the bottom in the side case, and the telescopic end is connected with the antenna device; and the overturning device is installed in the side case, connected with the telescopic device and used for driving the telescopic device to rotate around the hinged position of the telescopic device. The technical problems that an existing unmanned aerial vehicle for inspection work is low in inspection cruising ability, large in battery management difficulty and small in flight range are solved.

The invention discloses a photovoltaic module with an automatic displacement and cleaning device, which comprises a screw rod guide rail, a cleaning device, a driving component and a photovoltaic component, wherein the cleaning device is connected with the screw rod guide rail, the driving component is connected with the screw rod guide rail, and the driving component drives the screw rod guide rail to rotate and drives the cleaning device to move along the screw rod guide rail to clean the photovoltaic component; as such, the surface of the photovoltaic component can be spray cleaned completely by the cleaning device, and the whole photovoltaic component can be cleaned more thoroughly, so that the photovoltaic component can be conveniently cleaned and periodically cleaned, the shielding influence of dust, pollution and the like can be reduced, and the power generation power of the photovoltaic component can be effectively increased.

The invention discloses a household photovoltaic assembly with a self-cleaning function. The assembly comprises a plurality of photovoltaic module units, and spraying devices are arranged at junctionsof the adjacent photovoltaic module units. The spraying devices can rotate by 360 degrees for spraying. By arranging the spraying devices, radial spraying can be carried out with the spraying devicesas the center, and the spraying devices rotate by 360 degrees to conduct regional cleaning on the photovoltaic module units. The spraying devices are arranged at multiple points so that the whole surface of the household photovoltaic assembly can be cleaned, the functions of convenient cleaning and regular cleaning can be achieved, then the shielding influence of dust, pollution and the like is reduced, and the power generation power of the household photovoltaic module is effectively improved.

The invention discloses a deep ultraviolet LED chip with a vertical structure, a manufacturing method and an epitaxial structure. The manufacturing method comprises the following steps: forming the epitaxial structure on a sapphire substrate, wherein the epitaxial structure is provided with a first surface and a second surface, and the second surface is connected with the sapphire substrate; dividing the epitaxial structure into a plurality of epitaxial units arranged in an array, and part of the sapphire substrate is exposed between the adjacent epitaxial units; forming an adhesion layer on the sapphire substrate exposed between the adjacent epitaxial units; bonding and fixing a second substrate above the first surface of the epitaxial structure; stripping the sapphire substrate by laser; and removing the adhesive layer. According to the manufacturing method, the epitaxial structure is divided into the plurality of epitaxial units which are arranged in an array, so that the problem that the epitaxial structure is seriously damaged due to strong impact generated at the moment of high-energy density laser stripping is solved.

The invention provides a diversion extrusion die for a fine cantilever structure. The diversion extrusion die comprises an upper die body and a lower die body which are matched with each other. The upper die body is provided with diversion holes and diversion bridges. The diversion bridges partition the diversion holes. A die core is further arranged in the center of the inner side of the upper die body. A welding-on chamber is arranged on the lower die body. A cavity consistent with a machined aluminum profile in outline is formed in the center of the welding-on chamber. After the die core is inserted in the cavity, a mold cavity consistent with the aluminum profile in shape is formed. The cantilever structure is connected to one side wall of the cavity and located at the included angle position of the two side walls of the cavity. The cantilever structure comprises a cantilever neck and a cylindrical cantilever head which are connected. The cantilever neck is connected with one side wall. A protruding overhanging type suspension bridge is machined on the bottom face of the welding-on chamber beside the cavity, one end of the suspension bridge and the cantilever head are connected and fixed, and the suspension bridge extends towards the inner side wall of the welding-on chamber in the cantilever neck direction. The diversion extrusion die solves the problem that in the prior art, a fine cantilever structure of an extrusion die is prone to being extruded and broken, and consequently the die cannot be used.

The invention provides a log periodic feed source array based on spaceborne multi-beam antenna space three-dimensional structure layout. The log periodic feed source array is composed of five groups of high-frequency feed units, four groups of low-frequency feed units and a composite material supporting component. The mutual coupling influence on electrical performance of the feed source array between antennas can be reduced to the largest extent through three-dimensional structure layout and unit array distribution optimization under the requirement of spaceborne limited space layout so that the multi-beam coverage requirement of broadband and high gain of the antennas can be realized; the units and the supporting component are simple in structural form and high in reliability so that great rigidity-to-gravity requirement of the feed source array can be realized; and the special composite material and ingenious structural design are adopted, shielding influence of the supporting component on the electrical performance of the formed high-frequency and low-frequency feed units is enabled to be minimized under the condition of meeting the main structural strength of the feed source array, and the space environmental requirements can also be met.

A high-isolation slot antenna array relates to a multi-input multi-output antenna. The antenna is composed of three slot antennas which are arranged together, the radiation polarization directions of every two slot antennas intersect, and each slot antenna is formed by a micro-strip feeder on a dielectric substrate and a metal ground plane. A radiation slit and a plurality of isolation slots are formed in the metal ground plane. The isolation slots are formed in the periphery of the radiation slit, and the isolation slots are parallel to each other. The long side direction of the radiation slit is perpendicular to the long side direction of the isolation slots, and the length of the isolation slots enables the resonance frequency to be lower than the working efficiency of the antennas. An antenna input output port is formed in one end of the micro-strip feeder, a metal short circuit needle is arranged at the tail end of a micro-strip feeder conduction band at the other end of the micro-strip feeder, and the conduction band and the metal ground plane are connected on the edge of the radiation slit through the metal short circuit needle. The antenna can effectively reduce adverse effects of shielding and isolation of the metal ground plane on antenna normal radiation.

The invention discloses a cotton picker air pipe control mechanism. The cotton picker air pipe control mechanism is used for controlling lifting of a slide air pipe in a cotton delivering pipe; the cotton picker control mechanism comprises a cross beam, two scissor fork arm sets and an oil cylinder, and the cross beam is used for making the cotton picker air pipe control mechanism connected with the slide air pipe; the upper ends of the scissor fork arm sets are connected with the cross beam, and the lower ends of the scissor fork arm sets are fixed to a given base; the upper end of the oil cylinder supports the cross beam, and an oil cylinder base to be used for installing the oil cylinder is arranged at the lower end of the oil cylinder. The cotton picker air pipe control mechanism liftsand falls reliably, and the influence on passing performance and a driver's vision is small.

The invention provides an image sensor with a novel layout structure. The image sensor comprises a pixel array composed of a plurality of pixel units arranged in rows and columns, each pixel unit comprises a photosensitive unit, and each photosensitive unit comprises a photodiode and a transmission transistor; the transmission transistor is arranged at the corner of the photodiode along an inclination angle; wherein the arrangement structure of the transmission transistor forms an opening, and the floating diffusion point is arranged at the opening; and the source following transistor is arranged at the corner position of the pixel unit and is close to the floating diffusion point. The pixel unit can further comprise a conversion gain control transistor which is arranged on the same side of the reset transistor. According to the novel structure layout image sensor provided by the invention, the floating diffusion point capacitance of the pixel unit is small, the pixel circuit conversion gain is high, and the performance of the image sensor can be effectively improved.

The invention discloses a high-gain movable spot beam antenna suitable for Mars landing and patrol detection. According to the invention, a feed source is supported by a waveguide D-waveguide E and other two supporting members in a three-point manner and is suspended in the center of a reflecting surface, so that the influence of the supporting structure on the antenna performance is effectively reduced; and meanwhile, the waveguide calibers of the waveguide D, the waveguide E and the feed source are changed, so that the miniaturization of the feed source is effectively realized, and the shielding influence of the feed source is reduced; meanwhile, a non-compact antenna assembly pressing structure is adopted, and a pressing mounting surface with a height difference and a mounting surface provided by an unfolding supporting structure are adopted, so that the working requirement after the antenna is unfolded is met, and meanwhile, the maximum additional envelope after the antenna is installed can reach the maximum height size of an unfolding driving shaft assembly part to the minimum, so the additional envelope is greatly reduced, and the application envelope requirement of the Mars rover is met.