Results 31 to 40 of about 338,284 (271)

Development of strata movement and its control in underground mining: In memory of 40 years of Voussoir Beam Theory proposed by Academician Minggao Qian

Meitan kexue jishu, 2023
Since widely accepted by international scholars, Voussoir Beam Theory proposed by Academician Minggao Qian helps the research on underground mining pressure realize leapfrog development from the stage of qualitative hypothesis to quantitative analysis ...
WANG Jiachen, XU Jialin, YANG Shengli, WANG Zhaohui   +3 more
doaj   +1 more source

On models of the braid arrangement and their hidden symmetries [PDF]

, 2014
The De Concini-Procesi wonderful models of the braid arrangement of type $A_{n-1}$ are equipped with a natural $S_n$ action, but only the minimal model admits an `hidden' symmetry, i.e.
Callegaro, Filippo, Gaiffi, Giovanni
core   +2 more sources

Structure and composition of Androstachys johnsonii woodland across various strata in Gonarezhou National Park, southeast Zimbabwe [PDF]

, 2011
A study on the structure and composition of Androstachys johnsonii Prain (Euphorbiaceae) woodland across three strata was conducted in Gonarezhou National Park (GNP), southeast Zimbabwe.
Chikorowondo, G., Gandiwa, E., Muvengwi, J., Zisadza-Gandiwa, P.   +3 more
core   +2 more sources

A 3D modeling method of bending zone in overburden strata

Gong-kuang zidonghua, 2018
For problem that tri-prism model cannot accurately represent irregular stratum structure especially borehole deviation, a 3D modeling method of bending zone in overburden strata based on generalized tri-prism model was proposed.
SHI Xiaonan, JIN Qifeng, SHEN Xia
doaj   +1 more source

A long-lasting measles epidemic in Maroua, Cameroon 2008-2009: mass vaccination as response to the epidemic. [PDF]

, 2011
A measles outbreak occurred in Maroua, Cameroon, from January 2008 to April 2009. In accordance with recent World Health Organization guidelines, an outbreak-response immunization (ORI) was conducted in January 2009.
Anker, Aylward, Centers for Disease Control and Prevention, D. A. T. Cummings, de Alencar Ximenes, Dubray, Florence Fermon, Francisco J. Luquero, Goodson, Grais, Grais, Helfand, Heloise Pham-Orsetti, Katz, Lowther, Marcelino Nimpa, Ndong Ngoe, Orenstein, Peter Strebel, Philippe E. Ngaunji, Rebecca F. Grais, Samb, Sniadack, Stephen Sosler, Waters, World Health Organization, World Health Organization, World Health Organization, World Health Organization Regional Office for Africa, World Health Organization, UNICEF, United Nations Children's Fund, World Medical Association. Declaration of Helsinki   +30 more
core   +2 more sources

Mechanical behavior and failure mechanisms of rock bolts subjected to static-dynamic loads

International Journal of Mining Science and Technology
This study explores the effects of dynamic and static loading on rock bolt performance a key factor in maintaining the structural safety of coal mine roadways susceptible to coal bursts.
Hongpu Kang, Guiyang Yuan, Linpo Si, Fuqiang Gao, Jinfu Lou, Jinghe Yang, Shuangyong Dong   +6 more
doaj   +1 more source

Questionnaire surveys to discover academic staff and library staff perceptions of a National Union catalogue [PDF]

, 2002
During the feasibility study into a National Union catalogue for the UK (UKNUC), a questionnaire survey was undertaken of the needs of both academic staff in higher education and library staff.
Kidd, T., Stubley, P.
core   +1 more source

Experimental study on impact fracture characteristics and energy dissipation law of coal under water confining pressure

矿业科学学报
To investigate the actual dynamic fracture process and energy dissipation mechanisms of coal under triaxial loading conditions, a visual experimental study was conducted using a self-developed multi-field coupled Split Hopkinson Pressure Bar (SHPB ...
WANG Kai, FENG Guorui, BAI Jinwen, ZHANG Junliang   +3 more
doaj   +1 more source

Network-wide Configuration Synthesis

, 2017
Computer networks are hard to manage. Given a set of high-level requirements (e.g., reachability, security), operators have to manually figure out the individual configuration of potentially hundreds of devices running complex distributed protocols so ...
AY Halevy, B Fortz, C Cadar, D Kroening, E Clarke, EK Jackson, IS Mumick, J Doyle, J Gottlieb, JD Ullman, S Knight, S Narain, Y Smaragdakis   +12 more
core   +1 more source

A Practical Nonprobabilistic Reliability Assessment Method on Key Strata Shear Failure in Longwall Mining [PDF]

Mathematical Problems in Engineering, 2015
Roof cutting has long been a potential hazard factor in longwall panels in some diggings in China. Meanwhile, the key strata structural reliability, which provides an assessment on the stability of overlying roof strata, may be a significant reference for support design in underground coal mines.
Hebing Luan, Jiachen Wang, Guowei Ma, Ke Zhang   +3 more
openaire   +1 more source