11results about How to "Directional" patented technology

The invention belongs to the technical field of solar photovoltaics, and particularly relates to a back contact solar cell and a preparation method thereof. According to the method, the doped silicon oxide layer in the area needing to be removed is effectively removed by utilizing the strong directionality of dry fluorine etching and the difference of selective etching of the organic polymer and the silicon oxide, so that the doped silicon oxide layer and the doped polycrystalline silicon layer which are arranged below the organic polymer mask area are well protected. According to the invention, the doped silicon oxide layer is removed by adopting the dry fluorine etching, and the dry fluorine etching has good selectivity on the organic polymer mask and the doped silicon oxide layer, so that the loss of wet etching in the transverse direction can be effectively avoided. And the dry fluorine etching is strong in directivity and higher in etching precision. The doped silicon oxide layer in the non-printing area is removed through dry fluorine etching, and meanwhile, a part of the doped polycrystalline silicon layer located below the doped silicon oxide layer is correspondingly etched, so that the etching pressure of the subsequent doped polycrystalline silicon layer is reduced, and the production efficiency is further improved.

This invention discloses a screening method for isolated DC-DC converters for high-voltage power supplies in electric vehicles. It comprehensively considers the impact of switching frequency on isolated DC-DC converters for high-voltage power supplies, and evaluates five indicators affected by switching frequency—voltage ripple, efficiency, temperature rise, EMC, and volume—using a weighted function, and then screens them to select isolated DC-DC converters with more balanced performance across the five indicators as the isolated DC-DC converters for high-voltage power supplies in electric vehicles.

An antenna structure, an electronic device and a wireless network system, relate to the technical field of antennas. The antenna structure is characterized in that a medium plate and a metal bottom plate are spaced apart by a first preset distance; a first feeding port and a patch antenna array are located on a first surface of the medium plate, and a second feeding port is located on a second surface of the medium plate, the second surface being opposite to the first surface; the patch antenna array comprises four patch antennas, the four patch antennas being arranged in two rows and two columns, a feeding structure being included between the two patch antennas in each row, and a feeding structure being included between the two patch antennas in each column; the feeding structure between the two patch antennas in each column is connected to the first feeding port, so that the four patch antennas all generate polarization in a first direction; the feeding structure between the two patch antennas in each row is connected to the second feeding port, so that the four patch antennas all generate polarization in a second direction, the first direction being orthogonal to the second direction. The antenna structure has a simple structure and a high directional gain.

The present invention relates to an auxiliary analysis system for wiring faults in power grid stations, which belongs to the technical field of fault analysis and solves the problem of low efficiency of existing wiring fault analysis. It includes: a station drawing import module for importing the original image of the power grid station drawing, segmenting the original image to obtain each wiring diagram, and obtaining the image to be detected and the auxiliary image based on each wiring diagram; a wiring data recognition module for identifying components and text content and associating them according to each image to be detected and its auxiliary image using multiple neural network models; a wiring topology recognition module for identifying each line segment in each image to be detected, and constructing wiring link information according to the components or line segments connected by the line segments; an auxiliary analysis input module for selecting power grid station drawings, wiring diagrams, component numbers or line numbers; and a fault auxiliary analysis module for analyzing the fault source link and the influencing link from the wiring link information according to the selected component number or line number. The efficiency of fault analysis is improved.

This invention belongs to the field of ultrasonic sensing and microelectromechanical systems (MEMS) packaging technology, specifically relating to a multi-segment acoustic packaging structure and optimization method for a PMUT ultrasonic transducer. The multi-segment acoustic packaging structure for a PMUT ultrasonic transducer includes a base, a PMUT chip, and an acoustic cavity. The acoustic cavity includes a front cavity section, a tapered transition section, a conduit section, and a waterproof and acoustically permeable membrane. A first minimum gap is formed between the radiating surface of the PMUT chip and the bottom surface of the front cavity section; a second minimum gap is formed between the waterproof and acoustically permeable membrane and the outlet end of the conduit section. Furthermore, the acoustic cavity serves as either a transmitter or a receiver. When used as a transmitter, the depth of the front cavity section is greater than that of the front cavity section when used as a receiver, and the inner diameter of the conduit section is smaller than that of the conduit section when used as a receiver. This packaging structure, through optimization of geometric parameters and acoustic characteristics, achieves differentiated performance improvements for the transmitter and receiver, increasing the transmitted sound pressure and directivity, and expanding the bandwidth and receiving angle of the receiver.

The utility model provides a transradial artery blood vessel skin expander, which relates to the technical field of interventional medical instruments, and comprises a skin expander main body, the skin expander main body defines a first channel for a guide wire to pass through along the axis direction, the far end of the skin expander main body is provided with a blade, and the first channel is communicated with the blade. A limiting part is arranged on the side, opposite to the blade, of the skin expander body. The blade capable of advancing along the guide wire is adopted to replace a scalpel for skin cutting, compared with the scalpel, the scalpel has the advantages of being light in weight, high in directivity and the like, the limiting part is further arranged to prevent the blade from penetrating into the skin too deep, and blood vessels are prevented from being excessively cut and damaged; the problem that the cutting position and the cutting depth are difficult to control when a scalpel is used for cutting and the problem of tissue tearing caused by insufficient cutting can be solved.

The application provides a robot form optimization method and device, and relates to the technical field of artificial intelligence. The method comprises the following steps: obtaining a plurality of first form files to be optimized; wherein the first form file is an extensible markup language file; performing performance analysis on each first form file to obtain a text description corresponding to each first form file; wherein the text description indicates at least one of the advantages, disadvantages and improvement suggestions of the first form file; inputting at least one of the text description and a preset operation instruction and the first form file into a preset coding model to output at least one second form file. Through the generation of the text description and the construction of the preset operation instruction, the first form file in the form of the extensible markup language file can be directly optimized by using the preset coding model, and compared with the existing optimization mode by using an image model, the form optimization is unconstrained, efficient and directional.

The application relates to a self-adjusting bandwidth microstrip Yagi rectifier antenna and application, and belongs to the field of Internet of Things sensors. The application can be applied to Internet of Things sensors, and comprises a microstrip Yagi antenna and a rectifier. The microstrip Yagi antenna comprises a first substrate, an active oscillator, a reflector and a directive antenna. The rectifier comprises a microstrip line and an impedance changer. The application realizes self-power supply and saves electric energy. Meanwhile, the combination of a resistance voltage dividing circuit and a MOS tube is used. The combination of the DC voltage voltage dividing by the resistance voltage dividing circuit and the MOS tube controls the opening and closing of the directive antenna, various opening and closing combinations are formed, the bandwidth size is adjusted, and the problems that a traditional sensor needs active power supply and the communication bandwidth is narrow and unadjustable are solved.

The invention discloses a preparation method of glass containing holes with high aspect ratio. The preparation method comprises the following steps: (1) pretreating a glass substrate; (2) irradiating the target area of the glass substrate by using ultrafast laser to form a denaturation area; (3) coating photoresist on the upper surface and the lower surface of the glass substrate; (4) performing exposure treatment after the step (3); (5) after the step (4), carrying out developing treatment to expose the denatured region; and (6) carrying out dry etching on the denatured area on the glass substrate to obtain the glass containing the holes with high depth-diameter ratio, and reacting gases for dry etching are fluorine-based gases and oxygen. According to the preparation method disclosed by the invention, the high-precision processing of ultrafast laser, the fine mask protection effect of photoresist and the fine control of dry etching are ingeniously combined, so that the glass containing the holes with the high aspect ratio can be efficiently prepared with high precision.

This application relates to the field of lighting control technology, and more particularly to a vehicle lighting control method and system. The proposed solution involves acquiring dynamic information from multiple target objects to determine their motion trends and behavioral intentions, and mapping these intentions to a direction-sensitive objective function. Based on the motion trends, orientation alignment and spatial scaling are performed within a local reference coordinate system to construct a behavioral potential field model. Multiple behavioral potential field models are spatially superimposed to generate a spatially continuous illuminance weight map, which is then mapped to the lighting group to achieve point-to-point brightness adjustment. This application improves the accuracy of lighting response in complex traffic scenarios, avoids lighting interference, and ensures driving safety.

The application discloses a kind of transmission bender crystal spectrometer efficiency calibration method, device and electronic equipment, belong to ray spectrometer technical field.Transmission bender crystal spectrometer efficiency calibration method includes: by reference spectrometer to light source spectrometer to obtain reference energy spectrum distribution curve chart, and according to reference energy spectrum distribution curve chart determine target spectral line and target spectral line corresponding target reference signal intensity;By target spectrometer to light source spectrometer to obtain target energy spectrum distribution curve chart, and according to target energy spectrum distribution curve chart determine target spectral line corresponding target signal intensity;According to target reference signal intensity and target signal intensity obtain target spectrometer target efficiency.The method is simple and can quickly calibrate target efficiency, so that subsequent users can directly infer the intensity of the required light source by the target efficiency of the target spectrometer and the intensity of the required spectral line when using the target spectrometer to obtain the required spectral line, improving the speed and efficiency of light source adjustment.