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Horizontal well directional sand blasting perforation and fracturing integral tool pipe column and construction method thereof

The invention relates to a horizontal well directional sand blasting perforation and fracturing integral tool pipe column and a construction method thereof. The tool pipe column comprises a safe joint, a first centralizer, a first rotating joint, a hydraulic sand blasting device, a second rotating joint, a second centralizer, a packer, a coupling positioning device and a guiding shoe, wherein the safe joint is arranged at the left end of the tool pipe column; the guiding shoe is arranged at the right end of the tool pipe column; the left end of the safe joint is connected with an oil pipe; the first centralizer, the first rotating joint, the hydraulic sand blasting device, the second rotating joint, the second centralizer, the packer and the coupling positioning device are sequentially arranged between the right end of the safe joint and the guiding shoe from left to right. The horizontal well directional sand blasting perforation and fracturing integral tool pipe column and the construction method provided by the invention have the advantages that the structure of the tool pipe column is simple; the directional san blasting perforation can be realized; the stratum energy is released to the greatest degree; the problem of shot hole compression zone of gunpowder perforation can be solved.
Owner:JEREH ENERGY SERVICES

Smart video monitoring system based on cloud platform

The invention relates to a smart video monitoring system based on a cloud platform, and belongs to the technical field of remote smart monitoring. The system is characterized in that a video monitoring cloud platform is developed on a server cluster established on the basis of a Hadoop cloud computing platform, and video data acquired by front-end equipment are transmitted to a server in a stream way; through adoption of a massive distributed cloud computing technology, real-time tracking, processing, analysis and outputting of video streams are realized; and a service is provided externally, so that a terminal user can perform checking and calling conveniently. In the system, the characteristics of distributed high-concurrence access storage, high availability, rapid response, easiness in management and maintenance and the like are integrated. Video acquisition, video encoding and transcoding, video data storage, a streaming media distributed server and a client are all distributed on a physical host node in an access network. Compared with a conventional video monitoring system, the smart video monitoring system has the advantages that video real-time processing and transcoding efficiency and video data storage capacity are increased greatly; the requirement of people on the video monitoring system in a big data era is met; and a relatively large commercial value is achieved.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Identity authentication method and system

The invention discloses an identity authentication method and an identity authentication system. The method comprises the following steps: fixed identity identification information, a key schedule and a dynamic identity function are exchanged between a server and a client; a first random number is transmitted to the server and first response information transmitted by the client and second random number are received; the hash values of the first random number, the first dynamic identity information and the fixed client identity identification information as original texts are calculated and compared with the first response information, if the same hash values are present, the authentication is qualified; second response information is calculated and transmitted to the client, so that the hash values of the second random number, the second dynamic identity information and the fixed server identity identification information as the original texts are calculated by the client and compared with the second response information; if the same hash values are present, the authentication is qualified. The method is characterized in that the dynamic identity information is flexible and changeable, the information can be prevented from being revealed, the password encoding difficulty is increased and the security of the identity authentication is improved. Besides the method further comprises the following steps of key negotiation, heartbeat authentication and key schedule update, and thus the communication security and the periodic identity authentication are ensured.
Owner:ZHEJIANG UNIV

Device for automatically correcting accelerator pedal misoperation to braking operation by electrical and mechanical combination

The invention relates to a device for automatically correcting an accelerator pedal misoperation to a braking operation by electrical and mechanical combination, which belongs to a device capable of obtaining a mechanical operation for driving a brake device by means of electrical signal conversion of a mechanical operation of stepping on an accelerator pedal by mistake. The device comprises a sensor and is characterized in that the device further comprises a signal analyzer and a brake starting mechanism, wherein the sensor is connected with the signal analyzer to transmit an accelerator signal from the sensor to the signal analyzer, the signal analyzer is connected with the brake starting mechanism and transmits a brake start-up signal to the brake starting mechanism. The invention has the advantages that the mechanical operation of stepping on the accelerator pedal by mistake is converted into an accelerator electrical signal through the sensor, an electrical signal of serious accelerator pedal misoperation is analyzed, then the electrical signal of serious accelerator pedal misoperation is converted into an electrical signal for starting the brake device, and the brake starting mechanism generates a braking mechanical operation, as a result, the mechanical operation of stepping on the accelerator pedal by mistake is automatically converted into the braking operation of thevehicle, which prevents the occurrence of serious vehicle accidents caused by the misoperation of the accelerator pedal.
Owner:ZHEJIANG XIANAN AUTOMOBILE BREAKING SYST

Integrated navigation and positioning system and method for submarine oil-gas pipe detection robot

PendingCN110006433AExact effective positionAccurate and effective attitude informationNavigational calculation instrumentsNavigation by speed/acceleration measurementsOcean bottomTime course
The invention belongs to the technical field of navigation and provides an integrated navigation and positioning system and method for a submarine oil and gas pipe detection robot. The integrated navigation and positioning system mainly comprises a differential GPS system, an ultra-short baseline positioning system (USBL), a strapdown inertial navigation system (SINS), a Doppler log (DVL) and thelike. The differential GPS system accurately positions geographic position coordinates of a surface vessel; the ultra-short baseline positioning system determines a three-dimensional vector position of the underwater unmanned aerial vehicle relative to the water surface unmanned ship; the strapdown inertial navigation system detects the real-time course and attitude of the underwater unmanned vehicle; and the Doppler log detects the absolute running speed of the underwater unmanned vehicle. The SINS and the DVL are combined to realize short-time high-precision positioning of the underwater unmanned vehicle, and the differential GPS and the USBL are combined to realize absolute positioning of the underwater unmanned vehicle; the long-endurance and long-voyage high-precision positioning of the underwater unmanned vehicle is realized, and the accurate position information is provided. The invention further provides a combined positioning method of various navigation instruments, and a solution is provided for underwater high-precision combined navigation.
Owner:HARBIN ENG UNIV

Corrugated double-inner-cavity gas-powered flexible micro finger, control method and grabbing system

The invention discloses a corrugated double-inner-cavity gas-powered flexible micro finger, a control method and a grabbing system. The corrugated double-inner-cavity gas-powered flexible micro finger comprises a double-inner-cavity gas-powered flexible micro finger body composed of two independent pneumatic half-corrugated hollow rubber tube half-fingers I and II which are symmetrically arranged. A thin sheet type bending tilt angle sensor making contact with the two half-fingers is arranged between the two half-fingers. The two half-fingers are provided with a gas inlet and outlet I and a gas inlet and outlet II respectively. The outer side of the top face of each independent pneumatic half-corrugated hollow rubber tube half-finger is a corrugated surface, the bottom face of each independent pneumatic half-corrugated hollow rubber tube half-finger is a horizontal plane, and the top face and the bottom face of each independent pneumatic half-corrugated hollow rubber tube half-finger are connected into a whole to form a hollow sealing cavity. The bottom faces of the two independent pneumatic half-corrugated hollow rubber tube half-fingers I and II are aligned with each other and then are pasted on the thin sheet type bending tilt angle sensor. The corrugated double-inner-cavity gas-powered flexible micro finger has the advantages of being low in cost, safe in cleaning, easy and convenient to install, good in flexibility, smooth in motion, low in noise and free of pollution, having mechanical performance similar to that of biological muscles, and the like.
Owner:SHANDONG ACAD OF SCI INST OF AUTOMATION

Vehicle-mounted 360-degree panorama mosaic method

The invention discloses a vehicle-mounted 360-degree panorama mosaic method which includes utilizing a double-curve model to match a fisheye camera model, and calculating fisheye camera model parameters; confirming a mapping relation between a picture coordinate system and a camera coordinate system; confirming a homography matrix from the camera coordinate system to a ground coordinate system; generating a mapping lookup table from the picture coordinate system to the ground coordinate system; and enabling ground pictures obtained by a camera to be matched into a final aerial view according to the mapping lookup table. According to the vehicle-mounted 360-degree panorama matching method, for complexity of images of four view fields of the vehicle-mounted environment, the mapping lookup table from an original view field to the aerial view is built by utilizing the mapping relation. Compared with feature point match, the method only depends on the coordinate relation, a coordinate is relatively fixed when the camera is fixed, so compared with matching, the method is reliable. The original pictures are directly mapped to positions below the camera coordinate system, mapping from the camera coordinate system to a world coordinate system is omitted, errors are reduced, and accuracy is high.
Owner:KUNSHAN BRANCH INST OF MICROELECTRONICS OF CHINESE ACADEMY OF SCI
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