Results 81 to 90 of about 4,725,858 (203)

Forces Behind South Australia's Unusual Structural Changes Since 1840

Australian Journal of Agricultural and Resource Economics, EarlyView.
ABSTRACT The agricultural sector's share of GDP in growing economies typically declines but, for a century from the early 1850s, Australia's did not. That trend is most evident for the former colony and now State of South Australia (SA). Moreover, that share for SA has been almost flat since 1980 as well, along with the agricultural sector's share of ...
Kym Anderson
wiley   +1 more source

Study on unmanned mining technology of fully mechanized coal mining face

, 2017
The paper analyzed present situation of development of fully mechanized coal mining face, including application situation and existing problems of technologies of memory coal cutting, hydraulic support automation, coal and rock identification and so on ...
SUO Zhiwe
core   +1 more source

Innovation progress and prospect on key technologies of intelligent coal mining

Gong-kuang zidonghua, 2018
Innovation and practice were summarized overall about intelligent fully mechanized coal mining in thin coal seam and thinner coal seam, intelligent fully mechanized coal mining of large mining height and super large mining height in thick coal seam, and ...
WANG Guofa, FAN Jingdao, XU Yajun, REN Huaiwei   +3 more
doaj   +1 more source

‘Elbow grease and yellow soap’: Housework time in working‐class households in late‐nineteenth and early twentieth‐century Britain

The Economic History Review, EarlyView.
Abstract Housework is central to feminist calls for recognition of women's work, economic histories explaining the sexual division of labour, and claims regarding the progressive role of scientific knowledge. Yet little is known about the time it actually took. We address this lacuna.
Sara Horrell, Jane Humphries
wiley   +1 more source

Design of automation control system of fully-mechanized coal face

, 2015
In order to realize collaborative automation running of equipments on fully-mechanized coal face, an automation control system of fully-mechanized coal face was designed, composition and function realization of three machine control system, belt conveyor
PENG Qingguo, ZHENG Jiasong, SU Zhengfei, ZHANG Xiansheng, DING Congshi, ZHANG Xianyu, LYU Lei   +6 more
core   +1 more source

Understanding Non‐Compliant Work and Employment in the United Kingdom? The Field of Research and Policy Limitations

Industrial Relations Journal, EarlyView.
ABSTRACT Official discourse suggests that 12% of Britain's workforce engages in precarious work where non‐compliance is concentrated. Research reported here suggests this provides a partial picture and that, in specific sectors, non‐compliant employers, organized crime groups and criminalized employment are ceded by the state, where many ...
Ian Clark, Nidhi Sharma, Darryl Dixon, Richard Pickford   +3 more
wiley   +1 more source

Evolution characteristics of overburden structure in inclined fully mechanized caving under residual coal pillars of the upper layer

Gong-kuang zidonghua
In the stratified fully mechanized caving of ultra-thick coal seams, the inclined layout of upper and lower caving faces leads to lower fully mechanized caving face intermittently crossing residual coal pillars of the upper layer. This results in complex
LIU Yong, WANG Hongwei, WU Xuesong, TIAN Chengpeng, GUAN Rongfu, NIE Yunxiao, FAN Zhiwei, CAO Peipei   +7 more
doaj   +1 more source

Research on Mechanism and Prevention Technology of Rib Spalling In Fully-Mechanized Coal Mining Face with Soft and Unstable Seam

IOP Conference Series: Earth and Environment, 2019
The present situation and influencing factors involved in rib-spalling at a fully-mechanized coal mining face with soft and unstable seam were analyzed. The stress characteristics and the mechanism of rib spalling were modeled.
Wu-Lin Lei, Xing-Liang Li, W. Du, Ji Zhang, Ju-Feng Zhang, Fei Shang, Tai Xu   +6 more
semanticscholar   +1 more source

River Sand and Gravel Mining: Global Drivers, Impacts, and Pathways for Sustainable Management

Reviews of Geophysics, Volume 64, Issue 3, September 2026.
Abstract River sand and gravel are mined worldwide at volumes that now rival their natural replenishment, yet quantitative knowledge of this mining activity and its consequences lags far behind many other global environmental pressures. We synthesize 411 peer‐reviewed studies published since 1974 within a new Driver‐to‐Management Pathway for ...
Edward Park, Christopher R. Hackney, Dung Duc Tran, Mette Bendixen, Jim Best, Kai Wan Yuen, Hannah Runeckles, Md Sadiul Alam Chyon, Karl Kästner, Sonu Kumar, Halinishi Yusuf, Vanessa Lamb, Lars L. Iversen, Aelis Spiller, Rajiv Sinha, Eduardo Francisco da Silva, Enner Alcantara, Chengcheng Wu, Chengpeng Lu, Chu Jian, Jingyu Wang, Nguyen Duc Thien, Lian Feng, Priyank Pravin Patel, Jiachun Huang, Adam D. Switzer   +25 more
wiley   +1 more source

Research on following automation technology of hydraulic support on fully—mechanized coal mining face

, 2018
In view of characteristics of full cutting depth bidirectional cutting technology which was widely used in fully—mechanized coal mining face, a following automation technology of hydraulic support on fully—mechanized coal mining face was put forward ...
GAO Weiyong, ZHANG Minjuan
core   +1 more source