Results 51 to 60 of about 802,471 (295)

Strength weakening characteristic of rock burst structural planes

工程科学学报, 2018
Prediction and prevention of rock burst in project is difficult because of its paroxysm and sudden destructiveness. Determining how to predict the time, place, and intensity of rock burst is one of the main engineering problems that must be solved via ...
DU Yan, ZHENG Xiao-ting, XIE Mo-wen, JIANG Yu-jing, LIU Qiu-qiang   +4 more
doaj   +1 more source

Early-warning and soft structure prevention technology of rock burst risk based on multi-source information fusion

Meikuang Anquan, 2023
Aiming at the problems of large discreteness of early warning results and prediction positions of rock burst, a multi-source information fusion early warning technology is studied, and a multi-source information fusion depth prediction model based on ...
HE Yongliang, WANG Suping, FU Yuping, CAO Xuefang, SUN Dali
doaj   +1 more source

Green and Scalable Synthesis of Efficient and Stable CsPbBr3 Perovskite Quantum Dots Enables Low‐Threshold Amplified Spontaneous Emission

Advanced Science, EarlyView.
Green and scalable synthesis of CsPbBr3 perovskite quantum dots using bio‐sourced lecithin and hexane enables single‐batch production over 10 grams. Suppressed Auger recombination and electron‐phonon coupling yields 95% PLQY, enhanced stability, and low ASE thresholds of 230.4 (ns) and 50.1 (fs) µJ cm−2 in neat films. ABSTRACT Halide perovskite quantum
Yongfeng Liu, Mengting Zhang, Qingyu Xie, Kehao Hu, Bowen Zhang, Zhe Zhang, Jie Yang, Zhiping Hu, Juan Du, Jia Wang, Min Zhou   +10 more
wiley   +1 more source

Supervised and unsupervised general framework for rockburst risk prediction based on feature contrast of long-term and short-term microseismic data

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Short-term rockburst risk prediction based on microseismic (MS) data is a significant research task to overcome the rockburst challenge during the excavation stage. By reviewing previous short-term rockburst risk prediction methods based on MS data, this
Haikuan Zhang, Haitao Li, Xiufeng Zhang, Shanshan Xue, Haichen Ying, Atao Li, Jianwei Zheng, Xiaoshan Shi   +7 more
doaj   +1 more source

Gestational Hypoxia Disrupts Medial Ganglionic Eminence Progenitor Dynamics and Interneuron Development in Schizophrenia

Advanced Science, EarlyView.
FES‐derived MGE spheroids exhibit progenitor‐stage alterations in developmental trajectory and hypoxia‐responsive transcriptional programs, followed by functional disruption. Gestational hypoxia recapitulates impaired progenitor proliferation, shortened cell‐cycle progression, interneuron developmental abnormalities, and schizophrenia‐like behaviors in
Peiyan Ni, Qiancheng Zhang, Youhui Jiang, Huiying Yao, Chuqing Zhou, Xiaoyi Tian, Shiyingnan Gao, Jun Zhao, Xinyi Ren, Naxin Xu, Mengshan Fu, Liansheng Zhao, Xueyu Qi, Xueli Yu, Wanjun Guo, Sangmi Chung, Fan Guo, Tao Li   +17 more
wiley   +1 more source

A Burst-by-Burst Adaptive Joint-Detection Based CDMA Speech Transceiver

, 2001
A burst-by-burst adaptive speech transceiver is proposed, which can drop its source coding rate and speech quality under transceiver control in order to invoke a more error resilient modem mode amongst less favourable channel conditions.
Liew, TH, Kuan, EL, How, HT, Hanzo, L
core   +1 more source

Study on initial fracture distribution and bearing damage evolution mechanism of disturbed coal samples in oil-rich coal deposits in western China

Frontiers in Materials
The simultaneous formation of stress transfer and structural optimization in deep underground engineering strongly influences the occurrence and severity of dynamic disasters, especially under complex stress–structure conditions.
Yawu Shao, Yawu Shao, Yawu Shao, Yawu Shao, Lei Zhu, Lei Zhu, Lei Zhu, Chang Xin, Gang Han, Gang Han, Gang Han, Haifei Lin, Hu Liu, Hu Liu, Hu Liu, Jiahao Xie, Jiahao Xie, Jiahao Xie, Jiahao Xie, Mingming Sun, Mingming Sun, Mingming Sun, Jin Wang, Jin Wang, Jin Wang   +24 more
doaj   +1 more source

New method for introducing gradient stress into rock-burst prediction

Yantu gongcheng xuebao, 2020
During the excavation of underground projects, the tangential stress in the surrounding rock near the cave wall is distributed in a gradient because of the disturbance of excavation unloading in the deep rock mass.
HE Jia-qi 1, LIN Man-qing 1, LIU Xi-qi 2, ZHANG Lan 1, ZHANG Dian-ji 1, XIONG Wen 2, PENG Ya-li 3
doaj   +1 more source

6.1% Volumetric Negative Thermal Expansion Induced by the Reversible Reconstructive Phase Transition in Pb‐Free Bi1−xLnxCoO3 (Ln: Lanthanoid)

Advanced Science, EarlyView.
Perovskite‐type oxide lanthanoid‐substituted BiCoO3 exhibits a reversible negative thermal expansion (NTE) originated from the coordination change from the CoO5 pyramid to the CoO6 octahedron due to melting of the dxy orbital ordering in the d6 electron configuration, and the 6.1% volume shrinkage in Bi0.82Nd0.18CoO3 is the largest ever observed in the
Yuki Sakai, Kazuki Takahashi, Shogo Wakazaki, Takumi Nishikubo, Jun Miyake, Takehiro Koike, Teppei Nagase, Takafumi Yamamoto, Kano Hatayama, Masaichiro Mizumaki, Masaki Azuma   +10 more
wiley   +1 more source

Rock Burst Analyse in Qirehataer Diversion Tunnel

, 2011
Rock burst is a geological hazard which occurs when hard and brittle rock mass is excavated under high in-situ stresses or high stress concentration. The Qirehataer diversion tunnel has 15.66 km long at a maximum depth of 1720 m.
Jian Feng Bian, Jian Jun Zhou, Guo Bin Zhao   +2 more
core   +1 more source