Boe Technology Group Co., Ltd.

Hulu, LLC

China National Petroleum Corporation

Huawei Technologies Co., Limited

Beijing Xiaomi Mobile Software Co., Ltd.

Baidu Online Network Technology (beijing) Co., Ltd.

Beijing Baidu Netcom Science and Technology Co., Ltd.

Google Inc.

Tsinghua University

Lenovo (beijing) Limited

Beijing Boe Technology Development Co., Ltd.

Beijing Lenovo Software Ltd.

Petrochina Company Limited

Beijing Jingdong Shangke Information Technology Co., Ltd.

Apollo Intelligent Connectivity (beijing) Technology Co., Ltd.

Chi Zhang

Ming Xu

Tieshi Wang

Dongxu Han

Yongqian Li

Zhongyuan Wu

Wei Liu

Hua Zhang

Pan Xu

Yong Ma

Wei Li

Lili Chen

Hao Liu

Liang Wang

Yu Ma

Chao Wang

Zhiwei Li

Tong Yang

Wenchao Bao

Ruigang Yang

Yue Wu

Rui Cai

Hao Li

Kun Guo

Fan Yang

Can Yuan

Zhidong Yuan

Lei Chen

Wei Chen

Dong Wang

Fei Yang

Min He

Jing Cheng

Lei Huang

Wei Tang

Rui Zhang

Yuan Yao

Cheng Liu

Kun Cao

Chuang Wang

Jun Yang

Yanjun Liu

Limin Zhang

Feng Xu

Shuchang Zhou

Ping Liu

Zishuai Liu

Yuchao Guo

Fengzhong Qi

Shuoqiong Liu

Christopher Russell Kehler

Jianzhou Jin

Yongjin Yu

Lutfi Ilke Kaya

Zhiwei Ding

Congfeng Qu

Chongfeng Zhou

Youzhi Zheng

Xiaobing Zhang

Bin Lyu

Hongfei Ji

Yusi Feng

Jin Fang

Feilong Yan

Zhonglin Wang

Kuiyuan Yang

Bangsheng Tang

Jinxia Hu

Zhaohui Wang

Hong Yue

Tongtong Zhao

Kang Kang

Qian Chen

Jiaju Wu

Qinghua Yu

Hongtao Ma

Zhuping Gu

Sihai Ye

Jianhua Guo

Xiangye Xiao

Liang Shi

Huifeng Ding

Yuxiang Zhou

Bo Qin

Yao Wang

Huafang Gao

Han Yang

Rui Zheng

Wei Tan

Yanfeng Zhang

Qin Han

Gao Yu

Yue Tian

Jiang Li

Hongxing Chen

Deming Yu

Gengxin Lan

A high-strength Portland cement slurry for ultra-high-temperature cementing, a preparation method therefor and an application thereof. In parts by weight, the composition of the cement slurry comprises: 100 parts of Portland cement, 4-6 parts of a high temperature anti-cracking material, 80-105 parts of a high-temperature reinforcing material, 70-78 parts of water, 0.5-1.5 parts of a dispersant, 1-3 parts of a fluid loss reducer, 0.5-2.5 parts of a retarder and 0.2-0.5 parts of a defoamer; the high-temperature reinforcing material is a combination of acid-washed quartz sand, metakaolin and aluminum sulfate, a combination of acid-washed quartz sand, metakaolin, feldspar and sodium sulfate, or a combination of acid-washed quartz sand, metakaolin, feldspar and calcium nitrite. The cement slurry has good settling stability, rapid strength development in low temperatures, high compressive strength of cement stone at a high temperature of 600° C., and stable development of long-term high-temperature compressive strength.

High-strength Portland cement slurry for ultra-high temperature cementing, preparation method therefor and application thereof

A vehicle traveling control method, the method includes: determining predicted motion features of a to-be-avoided object within a perception visual field of a vehicle; determining a safety level of the to-be-avoided object relative to the vehicle according to the predicted motion features and preset safety conditions; and determining a target deceleration of the vehicle according to an attribute feature of the to-be-avoided object and the corresponding safety level, and controlling traveling of the vehicle according to the target deceleration.

Vehicle traveling control method, electronic device, storage medium, chip and vehicle

The present disclosure relates to the technical field of oil and gas field exploitation, in particular to an early strength material suitable for a cement slurry system, a cement slurry composition, a cement slurry system, a preparation method therefor and the use thereof. The early strength material contains an aluminum salt, a sodium salt, crystal whiskers, an inorganic mineral and dispersing agent I, wherein the weight ratio of the aluminum salt, the sodium salt, the crystal whiskers, the inorganic mineral and dispersing agent I is (1-3):(1-3):(1-4):(1-8):1. The early strength material provided by the present invention has both high-temperature retarding performance and low-temperature early strength performance; meanwhile, while satisfying well cementing, the cement slurry system prepared from the cement slurry composition containing the early strength material can prolong thickening time of cement slurry under a high-temperature condition, can prevent ultra-retarding of top cement slurry under a low-temperature condition and has increased early strength.

Cement slurry system, preparation method therefor and use thereof

A method and an apparatus for vehicle positioning. The method includes: acquiring a distance transformation image of a road marking object in a road image based on the road image of an environment where a vehicle is located at a current time point; acquiring a vector subgraph of the road marking object from a global vector map; and determining a target positioning posture of the vehicle based on the distance transformation image and the vector subgraph.

Method and apparatus for vehicle positioning

A carpet recognition method for a robot cleaner. The robot cleaner comprises a sleeve and an ultrasonic sensor, wherein the ultrasonic sensor is fixed in the sleeve. The recognition method comprises: controlling the ultrasonic sensor to vertically transmit an ultrasonic signal to the current ground, and to receive an actual echo signal reflected by the current ground; and determining whether the actual echo signal is different from the standard echo signal of the normal ground, and if so, recognizing the current ground as a carpet surface.

Carpet recognition method applicable to robot cleaner

An ultra-high temperature resistant cement slurry system comprising cement, an ultra-high temperature strength stabilizer, an ultra-high temperature reinforcing material, a density regulator, an ultra-high temperature suspension stabilizer, a dispersant, a fluid loss additive, a retarder, a defoaming agent and water, wherein the ultra-high temperature suspension stabilizer comprises an ether-based starch, an aluminosilicate and a polyalcohol polymer. The method for preparing the cement slurry system includes dry mixing and wet mixing raw materials homogeneously, respectively, and then homogeneously mixing the dry mix and wet mix to obtain the cement slurry system. The cement slurry system can be used for cementing in deep wells and ultra-deep wells at high and ultra-high temperatures.

Ultra-high temperature resistant cement slurry system for cementing and preparation method and use thereof

A vehicle traveling control method, includes: predicting traveling paths of candidate vehicles within the sensing range of a current vehicle; determining a target competing vehicle competing with the current vehicle from the candidate vehicles, where the target competing vehicle is a vehicle having a path intersection with the traveling path of the current vehicle; determining the traveling strategy combinations of the current vehicle and the target competing vehicle according to preset traveling variations and current traveling status of the current vehicle and the target competing vehicle; and determining a target traveling strategy combination that meets preset safe traveling conditions from the traveling strategy combinations, and controlling the traveling of the current vehicle according to the target traveling strategy combination.

Vehicle traveling control method and apparatus, device, and storage medium

A method for lateral control of a vehicle includes: determining a target steering wheel rotation angle based on a target trajectory of the vehicle and a vehicle pose; determining a steering wheel rotation angle compensation according to the target steering wheel rotation angle and steering data of the vehicle; and controlling steering of the vehicle according to the target steering wheel rotation angle and the steering wheel rotation angle compensation, such that an actual steering angle of the vehicle is consistent with the target steering wheel rotation angle.

Method and apparatus for lateral control of vehicle, storage medium and vehicle

A vehicle localization method and device, an electronic device and a storage medium. The vehicle localization method includes: acquiring an image of a scene where a vehicle is located, the image comprising a semantic element; determining an element category corresponding to the semantic element; matching the semantic element with a map element to acquire a matching result by a matching method corresponding to the element category; and determining localization information of the vehicle according to the matching result.

Vehicle localization method and device, electronic device and storage medium

A well cementing method is described for improving cementing quality by controlling the hydration heat of cement slurry. By controlling the degree and/or rate of hydration heat release from cement slurry, the method improves the hydration heat release during formation of cement with curing of cement slurry, improves the binding quality between the cement and the interfaces, and in turn improves the cementing quality at the open hole section and/or the overlap section. The cementing method improves cementing quality of oil and gas wells and reduces the risk of annular pressure.

Well cementing method for improving well cementing quality by controlling hydration heat of cement slurry

A method for generating simulated point cloud data, a device, and a storage medium includes: acquiring at least one frame of point cloud data collected by a road collecting device in an actual environment without a dynamic obstacle as static scene point cloud data; setting, least one dynamic obstacle in a coordinate system matching the static scene point cloud data; simulating in the coordinate system, a plurality of simulated scanning lights emitted by a virtual scanner located at an origin of the coordinate system; updating the static scene point cloud data according to intersections of the plurality of simulated scanning lights and the at least one dynamic obstacle to obtain the simulated point cloud data comprising point cloud data of the dynamic obstacle; and at least one of adding a set noise to the simulated point cloud data, and, deleting point cloud data corresponding to the dynamic obstacle according to a set ratio.

Method for generating simulated point cloud data, device, and storage medium

A method, apparatus, electronic device and medium for transmitting a live message are provided. An embodiment of the method executed by a client end may include: detecting periodically a status of a persistent connection with the service end; and in response to detecting that the persistent connection is in a disconnected status, re-establishing the persistent connection with the service end, and pulling a first-type message issued during disconnection of the persistent connection from the service end.

Method for transmitting live message, apparatus, electronic device and medium

The invention provides a high temperature resistant Portland cement slurry and a production method thereof. The high temperature resistant Portland cement slurry comprises the following components by weight: 100 parts of an oil well Portland cement, 60-85 parts of a high temperature reinforcing material, 68-80 parts of fresh water, 1-200 parts of a density adjuster, 0.1-1.5 parts of a suspension stabilizer, 0.8-1.5 parts of a dispersant, 3-4 parts of a fluid loss agent, 0-3 parts of a retarder and 0.2-0.8 part of a defoamer. The high temperature resistant Portland cement slurry has a good sedimentation stability at normal temperature, and develops strength rapidly at a low temperature. The compressive strength is up to 40 MPa or more at a high temperature of 350&#xb0; C., and the long-term high-temperature compressive strength develops stably without degradation. Therefore, it can meet the requirements for field application in heavy oil thermal recovery wells, reaching the level of Grade G Portland cement for cementing oil and gas wells.

High temperature resistant Portland cement slurry and production method thereof

The present disclosure relates to a display method of a display panel. The display method may include obtaining original luminance of three single color subpixels in each of the pixel units based on an image to be displayed; obtaining luminance compensation values of the three single color subpixels that need to be color compensated at a time of obtaining the luminance of the mixed color subpixel as the first substitute luminance; calculating luminance of the mixed color produced by the three single color subpixels in the pixel unit respectively based on each of the luminance of the three single color subpixels after color compensation; and setting input luminance of the single color subpixel having the smallest luminance of the mixed color as 0, and obtaining actual luminance of the other single color subpixels and the mixed color subpixel.

Display panel, display method thereof, and display apparatus

The present disclosure provides a power management module, a power management method and an energy system for a triboelectric nanogenerator. The power management module is configured to be electrically connected to a back end of the triboelectric nanogenerator, the power management module includes a rectifying circuit and a Direct Current (DC) buck circuit. The rectifying circuit is electrically connected to the back end of the triboelectric nanogenerator for rectifying a signal generated by the triboelectric nanogenerator to output a first DC signal, and the DC buck circuit is electrically connected to a back end of the rectifying circuit for decreasing a voltage of the first DC signal to output a second DC signal. The power management module may maximize and autonomously release the energy of the triboelectric nanogenerator, and perform a buck conversion for charging the energy storage device or directly driving the electronic device.

Power management circuit and power management method for triboelectric nanogenerator, and energy system

Growing community of inventors

Beijing, China

Chi Zhang