Results 71 to 80 of about 7,615,775 (267)
American Journal of Agricultural Economics, EarlyView.Abstract Large‐scale land reforms constitute a substantial redistribution of wealth and reallocation of agricultural land, which is a major form of asset and production input in developing countries. While land redistribution (from the rich to the poor) remains a highly controversial issue, extensive evidence on its effect is limited.
Devashish Mitra +3 more
wiley +1 more source
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
openaire +1 more source
The role of venture‐financed startups in innovation for US agriculture
American Journal of Agricultural Economics, EarlyView.Abstract To evaluate the role played by startup companies in the innovation ecosystem of US agriculture, we compile a unique dataset of 6024 new entrants founded 1987–2019 that details their financing lifecycles, annual economic performance, and patenting activities.
Gregory D. Graff +2 more
wiley +1 more source
Research of Model Selection of 'Three Machines' of Mine Based on AHP
Gong-kuang zidonghua, 2010 The paper introduced general principle of structure model and application of AHP in model selection of 'three machines' of fully mechanized working face, put forward decision-making model for equipment matching in fully mechanized working face, which ...
TENG Xiang-li
doaj
Pumping pillar technology of fully mechanized caving face passing through abandoned roadway
Gong-kuang zidonghua, 2019 Existing working face passing through abandoned roadway based on traditional support methods cannot adapt to changeable geological conditions well. Based on research background of 8103 fully mechanized caving face of Yongdingzhuang Coal Industry Co., Ltd.
HAO Yuhui, KANG Guanxian
doaj +1 more source
Farm labor scarcity and its uneven impacts on crop producers in the United States
American Journal of Agricultural Economics, EarlyView.Abstract This study is the first to evaluate the impacts of farm labor scarcity on producers in the United States across different crop production systems. Between 2002 and 2017, we disentangle the effects of labor scarcity from the impacts of rising commodity demand, technological change, and supply of other inputs on labor market outcomes.
Srabashi Ray +4 more
wiley +1 more source
Development of automatic test platform of electro-hydraulic control system of hydraulic support
Gong-kuang zidonghua, 2018 In view of problems of high cost, low test efficiency and unable to record test data automatically of functional test methods of existing electro-hydraulic control system of hydraulic support, and in order to verify adaptability of control logic of the ...
LI Junshi
doaj +1 more source
Archaeological Prospection, EarlyView.ABSTRACT We investigated the Písečný vrch (Czech Republic), a site exploited for quartz mining in both prehistoric times and the 20th century. Due to their morphological similarity across all mining periods, the differentiation between pits with archaeological potential and recent ones is challenging.
Jan Fišer +5 more
wiley +1 more source
Mechanism and control of strong ground pressure in fully mechanized mining face
, 2021 In order to ensure the safe use of the withdrawal roadway in the fully mechanized mining face of thick coal seam, taking the strong ground pressure behavior of the withdrawal roadway in 31102 working face of Nalinhe No.2 well as the method of combination
Hao, LI, Yin, ZHANG, Yi, ZHAO
core +1 more source
British Educational Research Journal, EarlyView.Abstract This study explores the multifaceted dynamics of student sentiment towards artificial intelligence (AI)‐based education by integrating sentiment analysis techniques with statistical methods, including Monte Carlo simulations and decision tree modelling, alongside qualitative grounded theory analysis.
Volkan Duran +2 more
wiley +1 more source