Results 51 to 60 of about 7,615,775 (267)
Meitan kexue jishu, 2023 The excavation thickness of the coal seam and the corresponding motion space of the overlying strata are so large in the fully-mechanized top coal caving face, that roof accidents are occur easily.
XU Gang +8 more
doaj +1 more source
Study on Measuring and Forecasting of Fully Mechanized Working Face Roof Pressure System
TELKOMNIKA Indonesian Journal of Electrical Engineering, 2014 China is one of the largest coal producer and consumer countries in the world. However, due to the complexity of coal resources, storage conditions, geological disaster-prone coal mines, it is also a coal mine accidents multiple country, coal mine accidents and deaths of China accounted to about 80% total of the world.
Yong Zhang, XueQiang Yang, ZengXin Wang
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SiDT1 Defines Plant Architecture Reminiscent of Green Revolution in Foxtail Millet
Advanced Science, EarlyView.SiDT1 encodes a GA3‐oxidase that creates a semi‐dwarf, lodging‐resistant architecture reminiscent of the rice Green Revolution. The resulting ideotype performs well under dense planting and provides a valuable genetic resource for high‐yield, mechanized foxtail millet production. ABSTRACT Foxtail millet (Setaria italica) is a drought‐tolerant C4 cereal
Jianzhen Lv +13 more
wiley +1 more source
Failure Depth of a Floor of a Fully Mechanized Working Face When Passing a Collapse Column [PDF]
Advances in Civil Engineering, 2018 The stress change law of a collapse column and the failure depth of a coal seam floor before and after mining when the fully mechanized coal mining face passes through the collapse column are investigated. Here, we present the constructed program in FISH language, render the damage variable in FLAC3D to establish the numerical model, and complete the ...
Jinlong Cai, Min Tu, Wensong Xu
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, 2022 The dust control basis of fully mechanized mining face is clear dust source characteristics. In view of the problem of unclear dust source and unknown distribution characteristics in the working area of 7.8 m large fully mechanized mining face, the fully
Wei Ma, Zhi Li
core +1 more source
Advanced Science, EarlyView.Furrow tillage resolves the conventional‐vs.‐no‐tillage trade‐off by simultaneously cutting CO2 efflux to 2.0–3.0 g C m−2 d−1 and unlocking high nutrient availability for the rice rhizosphere. This scalable agronomic solution strengthens soil health, enhances plant physiology, reshapes microbial metabolism, and shifts paddy systems toward a net ...
Arnab Majumdar +10 more
wiley +1 more source
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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Smart Exploration of Perovskite Photovoltaics: From AI Driven Discovery to Autonomous Laboratories
Advanced Energy Materials, EarlyView.In this review, we summarize the fundamentals of AI in automated materials science, and review AI applications in perovskite solar cells. Then, we sum up recent progress in AI‐guided manufacturing optimization, and highlight AI‐driven high‐throughput and autonomous laboratories.
Wenning Chen +4 more
wiley +1 more source
Chinese Trade Competition and Rural Mexican Migration
Applied Economic Perspectives and Policy, EarlyView.ABSTRACT China's accession to the World Trade Organization in 2001 reshaped global trade, reducing U.S. demand for Mexican manufactured goods and weakening Mexico's manufacturing employment. This study estimates how this trade‐induced decline affected migration and employment decisions among rural Mexicans.
Zachariah Rutledge, Joaquin Mayorga
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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
wiley +1 more source