Huawei Technologies Co., Limited

Semiconductor Manufacturing International (shanghai) Corporation

China University of Mining and Technology

Microsoft Technology Licensing, LLC

Zte Corporation

Semiconductor Manufacturing International (beijing) Corporation

Future Wei Technologies, Inc.

Juniper Networks, Inc.

Gm Global Technolgoy Operations, Inc.

Panasonic Corporation

Autodesk, Inc.

Huawei Device Co., Ltd.

Beijing University of Technology

Hangzhou H3c Technologies Co., Ltd

Hewlett Packard Enterprise Development LP

Qiang Wu

Jianghua Liu

Yongxing Zhou

Jianqin Liu

Yifan Zeng

Chi Gao

Leiming Zhang

Kunpeng Liu

Bingyu Qu

Chaojun Li

Chang Liu

Tao Fu

Yang Liu

Zhiheng Guo

Weijun Sun

Xue Ping Liu

Brian Keith Classon

Weimin Xiao

Philippe J Sartori

Vipul Anil Desai

Yang Li

Yang Tang

Liu Liu

Jianguo Wang

Yue Zhao

Jia Zhao

Hao Li

Jian Wang

Mattias Frenne

Lixia Xue

Qiang Li

Hao Sun

Pengfei Xia

Lei Wan

Xingqing Cheng

David Mowatt

Haibo Liu

Chen-Xiong Zhang

Lu Wang

Hua Jiang

Chao Yu

Hongping Zhang

Wei W Wang

Yi Guo

Sha Ma

Liang Xia

Yongxia Lv

Kai Xu

Haijing Liu

Robert L Chambers

David Jean-Marie Mazzarese

Ciprian Ioan Chelba

Mingyu Zhou

Zhiqiang Yu

Li Jiang

Ting Huang

Xin Yao

Katsuhiko Hiramatsu

Lei Guan

Jun Wang

Jie Jerry Liu

Wei-Ying Ma

Yan Cheng

Ming Xu

Jianfeng Gao

Atsushi Sumasu

Rui Wang

Wei Chen

David Maxwell Chickering

Ruiqi Zhang

Timothy S Paek

Wei Huang

Xiaobo Chen

Li Liu

Zheng Zhao

Zhengwei Gong

Ion C Halalay

Krysta Marie Svore

Xiaoan Fan

Fei Chen

Michael Gamon

Eric Norman Badger

Fang Nan

Shaunak Chatterjee

Gang Hu

Wei Guang Lu

Jifeng Li

Hai Shan Wu

Xiaochao Que

Christopher J C Burges

David Mazzarese

Tao Liu

Hua Chen

Dimitrios Lymberopoulos

Jing Yu

Philipp Heinz Schmid

Zaiqing Nie

Liang Yang

Na Zhou

Provided are a method for grout injection repair and water retention in a goaf, including: determining extraction information on the goaf and a coal seam, forming a barrier wall through performing a first grouting operation at a side of the goaf near the coal seam based on the extraction information, performing a second grouting operation to complete a grout injection repair from outside to inside in the goaf based on the extraction information. The first grouting pressure of the first grouting operation is less than the second grouting pressure of the second grouting operation.

Methods for grout injection repair and water retention in goaf

Disclosed are a coal mining system and a coal mining method. The coal mining system includes: a mechanical coal breaking module, an air lift reverse circulation module, a jet coal breaking module, and a coal-air-water separation module. The mechanical coal breaking module includes: a drill pipe rotating device, a drill pipe, and a reamer bit, sequentially connected to perform rotary cutting, drilling and slotting operations on a coal seam in a borehole. The air lift reverse circulation module includes: an air compressor and a dual-wall drill pipe. The air compressor is configured to transport a coal-air-water mixture through an inner pipeline of the dual-wall drill pipe to the coal-air-water separation module. The jet coal breaking module includes: the drill pipe rotating device, a fracturing truck, the drill pipe, and a jet tool string, sequentially connected to mine the coal seam.

Coal mining system and method of dual circulation drilling with mechanical reaming and abrasive jet

Disclosed is a method of segmented grouting for repairing aquifers in a mining area after mining. The method may include: drilling a grouting hole in a ground area corresponding to a water inflow position in a goaf; and performing a segmented grouting in a target grouting layer through the grouting hole. The segmented grouting may include: a scour and migration grouting, a splitting and diffusion grouting, and a sedimentation and compaction grouting. The scour and migration grouting may use a first slurry with a first specific gravity and a first pump volume for grouting. The splitting and diffusion grouting may use a second slurry with a second specific gravity and a second pump volume for grouting. Moreover, the sedimentation and compaction grouting may use a third slurry with a third specific gravity and a third pump volume for grouting.

Method of segmented grouting for repairing aquifers in mining area

A coal rock interface directional detection device based on elastic waves includes: a probe body including an elastic wave receiving device and an elastic wave excitation device spaced set at the top; a protective tube with one end connected to the adapter. The protective tube includes a collection circuit board inside the protective tube, and the collection circuit board is electrically connected to the elastic wave receiving device and the elastic wave excitation device; a sleeve, installed outside the protective tube, with one end connected to the side of the probe body near the adapter and with the other end connected to the side of the protective tube away from the adapter; and a control host, wirelessly connected with the acquisition circuit board. A coal rock interface directional detection method based on elastic waves applied in the coal rock interface directional detection device is also disclosed.

Coal rock interface directional detection device and method based on elastic waves

A coal and coalbed methane mining system based on ground drilling includes: a drilling component, a coal mining drill bit and a ground facility group. The coal mining drill bit is set at a predetermined end of a directional borehole in a coal seam, connected to the drilling component through a connecting pipeline. The ground facility group is connected to the drilling component, to provide coal cutting slurry for the coal mining drill bit, receive reflux slurry carrying coal and coalbed methane, and precipitate and separate the reflux slurry carrying the coal and the coalbed methane. A coal and coalbed methane mining method based on ground drilling and related devices are also disclosed.

Coal and coalbed methane mining system based on ground drilling, method and related device

Disclosed are an integrated mining method and an integrated mining system of coal breaking, coal extraction and water circulation in a U-well. The integrated mining system includes a first ground facility unit, a second ground facility unit, a jet unit and an extraction unit. The first ground facility unit is configured to transport jet fluid to the jet unit. The jet unit is configured to break a coal seam in a sub-segment to obtain broken cinders. The extraction unit is configured to extract a coal-water mixture. The second ground facility unit is configured to receive the coal-water mixture. In response to determining that an extraction of the sub-segment is complete, the jet unit and the extraction unit is configured to move to a next sub-segment using powers provided by the first ground facility unit and the second ground facility unit.

Integrated mining method of coal breaking, coal extraction and water circulation in U-well and system thereof

Disclosed is a grouting and water blocking method for a hard rock stratum. The grouting and water blocking method include the following steps. At first, hydrogeological information and coal seam information of a hard rock stratum is obtained. Then, a drilling trajectory of the hard rock stratum is determined based on the hydrogeological information and the coal seam information. Later, at least one drilling device is determined corresponding to the drilling trajectory based on types of multiple rock layers contained in the hard rock stratum. After that, the multiple rock layers contained in the hard rock stratum are drilled sequentially according to the drilling trajectory using the at least one drilling device. At last, in response to determining there is a water leakage area, the water leakage area is grouted.

Grouting and water blocking method for directional hole with large offset in hard rock stratum

A directional drilling method applied to a rigid bending joint directional drilling device includes: obtaining geological data; determining a lateral drilling point and a target point of a branching borehole based on the geological data; drawing a target borehole trajectory of the branching borehole based on the lateral drilling point and the target point; obtaining parameters of the drill pipe; determining a propulsion force corresponding to the target borehole trajectory based on the parameters, the target borehole trajectory, and the geological data; and applying the propulsion force to the rigid bending joint directional drilling device for drilling the branching borehole. A directional drilling system and related devices are also disclosed.

Directional drilling method for branching borehole with short radius and system

Disclosed is a method for repairing an aquifer in a coal mine area by grouting, including: drilling a survey hole in a ground area corresponding to a water inflow position from ground surface to a caving zone in a goaf; determining a target layer for grouting in the survey hole based on drilling data collected from the survey hole while drilling; changing the survey hole to a grouting hole; measuring a first water level from the grouting hole; grouting through the grouting hole; changing the grouting hole to an observation hole; measuring a second water level from the observation hole; and determining a water retention level based on the first water level and the second water level.

Method for repairing aquifer in coal mine area

A method for operating a communications controller includes selecting a search space configuration out of a set of candidate search space configurations for a user equipment served by the communications controller, wherein the search space configuration specifies one or more search spaces to be monitored out of a set of search spaces, and signaling the selected search space configuration to the user equipment.

System and method for common control channels in a communications system

Disclosed are a method and a related device for determining a development status of a separation layer in a coal mine. The method includes: obtaining surface subsidence variation data of the coal mine within a preset time interval, rock stress variation data of a caving zone of the coal mine and water pressure variation data; determining a height decrease of the caving zone based on the rock stress variation data and the water pressure variation data; and determining the development status of the separation layer of the coal mine based on the height decrease and the surface subsidence variation data.

Method and device for determining development status of separation layer of coal mine

A tracer diffusion device includes: a first container, a second container, a drilling pipe, a unidirectional driving device, and a bidirectional driving device. The first container holds a first fluid containing a tracer. The second container holds a second fluid. A first end of the drilling pipe is connected to the first container; a second end of the drilling pipe is extended into a borehole and equipped with a first sealing capsule and a second sealing capsule. A plurality of through holes are arranged on the drilling pipe between the first sealing capsule and the second sealing capsule. The unidirectional driving device is arranged on the drilling pipe, for injecting the first fluid from the first container into the borehole between the first sealing capsule and the second sealing capsule. The bidirectional driving device is arranged between the second container and the first sealing capsule.

Tracer diffusion device, system for tracing development of water conducting fracture zone and relataed method

This application relates to the mobile communications field, and in particular, to a random access technology in a wireless communications system. This application provides a method for receiving a random access preamble sequence, an apparatus, and a system. In this solution, a device obtains a cyclic shift value that satisfies a high-speed movement scenario and receives a random access preamble sequence corresponding to the cyclic shift value.

Method for sending random access preamble sequence, device, and system

A curvature controllable directional drilling device is disclosed. The drilling device includes: a drill bit, a power unit, a rigid bending unit, a bendable outer wall, and a wedge deflection tool. The power unit is to provide a rotary power to the drill bit. The rigid bending unit is set between the drill bit and the power unit, to bend on a basis of an initial curvature under an external force. The bendable outer wall is set on an outer side of the power unit and the rigid bending unit. The wedge deflection tool is set at one end of the bendable outer wall near the drill bit, to receive a reaction force and bend the rigid bending unit. By a coordination between the wedge deflection tool and the power unit, a drilling direction of the drill bit connected to the rigid bending unit can be adjusted.

Directional drilling device and drilling method of aquifer remediation of coal seam roof

Provided is a method for laser additive manufacturing based on keyhole effects. A welding wire and a laser beam are arranged, at certain angles, on two sides of a normal line of a substrate respectively. The laser beam is applied on the welding wire to generate a deep penetration melting keyhole. The welding wire absorbs energy of the laser beam and is heated and melted in a deep penetration melting mode. The welding wire transmits energy to a surface of the substrate to form a cladding layer. The laser beam irradiates the surface of the substrate after passing through the welding wire, and preheats the surface of the substrate in a heat conduction mode.

Method and system for laser additive manufacturing based on keyhole effects

Growing community of inventors

Beijing, China

Qiang Wu