Results 61 to 70 of about 1,939 (269)
, 2023 The current research achievements in the construction of intelligent fully mechanized caving face lack systematic implementation case for a specific fully mechanized caving face.
WANG Zhiqiang +3 more
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Rural Labor Supply and Economic Opportunities: Commuting, Migration, Tariffs, and Immigration
Applied Economic Perspectives and Policy, EarlyView.ABSTRACT Some rural counties remain dependent on agricultural or manufacturing jobs, but an increasing proportion have diversified economics. Rural counties also differ in their abilities to commute to an urban market characterized by higher wages and labor productivity.
Peter F. Orazem, Mary C. Ahearn
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Agribusiness, EarlyView.Abstract Nucleus outgrower schemes are contractual arrangements where well‐resourced large‐scale farmers (nucleus farmers) are empowered by development support agencies to take charge of smallholder farmers, by providing them with market access and the necessary training on agronomic practices and farm inputs for production.
Dominic Tasila Konja, Awudu Abdulai
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Study of Abutment Pressure on Fully Mechanized Working Face Advancing Speed
Mine Engineering, 2016 在煤矿生产中，工作面的推进速度是影响支撑压力的重要因素之一。文章基于火铺矿21126综采工作面生产技术及地质条件，采用现场矿压实测及FlAC3D数值模拟，研究了不同推进速度时的矿压显现规律。研究表明，工作面前方35~80 m区段内，应力变化较大，受采动影响较为强烈;工作面前方35 m范围内应力变化剧烈，受采动影响十分严重。推进速度大于7 m/d时石门右侧塑性区范围加大，右侧围岩松散垮落现象明显，支护工作难度加大，所以工作面推进速度为5~7 m/d较为合理。 In coal mine production, the speed of working face advancing is one of the important factors affecting the support pressure.
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Agribusiness, EarlyView.ABSTRACT The penetration of information and communication technologies (ICTs) in farming communities is increasing the use of smartphone‐based instant messaging apps. Despite this, the reasons behind participation and the impact on farm productivity in developing countries remain unexplored.
Zafar Kurbanov +4 more
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Gong-kuang zidonghuaIn 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 +7 more
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, 2018 In order to solve problems of large number of workers and high labor intensity on fully mechanized mining face with large mining height, according to actual situation of No.2 Coal Mine of Huangling Mining Group Co., Ltd., technical difficulties such as ...
FAN Jingdao
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Agribusiness, EarlyView.ABSTRACT This paper explores the convergence in on‐farm diversification strategies of agricultural holdings, between remote areas and more central ones. Using Italian farm‐level data, we explore the determinants of diversification strategies across farms.
Gianluca Grilli +2 more
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Deforestation and Efficiency: Insights From Forest Transition in the Brazilian Cerrado
Agribusiness, EarlyView.ABSTRACT This paper estimates technical efficiency (TE) and environmental efficiency (EE) of agricultural production at the municipal level of the Brazilian Cerrado in 2006 and 2017, and investigates their underlying mechanisms in relation to forest transition theory.
Ricardo Muniz Simões +2 more
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Massive data mining and analysis platform design for fully mechanized working face
Gong-kuang zidonghua, 2023 The current real-time and integrity of massive data acquisition in fully mechanized working faces are poor. The abnormal data cleaning takes a long time. The data mining delays are large. This leads to low utilization rate of fully mechanized working data and incapability to assist management in issuing decision-making instructions in real-time.
WANG Hongwei +4 more
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