Results 111 to 120 of about 7,615,775 (267)

Design of height measurement sensor for hydraulic support in fully mechanized working face

Gong-kuang zidonghua
A hydraulic support height measueement sensor based on Pascal's law is designed to address the difficulties in measuring the height, reliability, and stability of hydraulic supports in fully mechanized working faces. The height measurement sensor is equipped with a slender liquid tube, which is filled with methyl silicone oil.
GAO Siwei, GU Minyong, LI Dianpeng
openaire   +1 more source

Research on the optimal design of roadway support for fully mechanized coal seam working face

Journal of Physics: Conference Series
Abstract For the optimal design of surrounding rock deformation and support in the shallow buried coal seam of large-scale fully mechanized mining face, this paper took the surrounding rock of the roadway as the research object, used theoretical calculation and numerical simulation to establish the mechanical model of the deformation of ...
Qiuhui Liang, Baoliang Zhang
openaire   +1 more source

Characters Evaluation of Ground Pressure in Fully Mechanized Top Coal Caving Face in Soft Coal Seams

, 2011
Based on the big thickness, low stiffiness and other characters of No. 8 coal seam in Huaibei mining area, the moving laws of top coal seam and roof, and distribution law of ground pressure were studied under the fully mechanized top coal caving.
Yang Li, Xiao Hua Wu, Wei Dong Pan
core   +1 more source

Reshaping Labor Intermediation: An Integrated Workforce Management Strategy to Contrast Agricultural Workers' Exploitation in Italy

Strategic Change, EarlyView.
ABSTRACT Labor exploitation within agri‐food supply chains poses significant ethical and managerial challenges, particularly in Mediterranean contexts where irregular employment practices persist. This study investigates the case of NoCap, a third‐party ethical certification initiative operating in Italy that integrates social responsibility into ...
Claudio Mirabella, Emanuele Schimmenti, Antonino Galati, Valeria Borsellino   +3 more
wiley   +1 more source

Research on the transportation model and coal quantity calculation algorithm of scraper conveyor based on array

Gong-kuang zidonghua
Currently, most research on coal quantity detection focuses on the coal quantity detection and recognition of underground belt conveyors in coal mines. The coal quantity detection of scraper conveyors in fully mechanized working (caving) faces only stays
YIN Rui, ZHANG Dongxue, NI Qiang
doaj   +1 more source

Gas Control Technology for Fully Mechanized Face of Outburst Coal Seam with Hard Roof during Initial Caving

, 2011
In the fully mechanized working face, with working face forward, gob area become bigger and bigger, when the top area reach a certain span ,roof in gob suddenly cave, outspreading a large quantity of mine gas, easy to cause the gas overrun and gas ...
Ju Gen Fu, Wei Wu, Gen Yong Hua
core   +1 more source

Is quinoa‐farming sustainable in marginal environments? Social, economical and environmental aspects

Journal of the Science of Food and Agriculture, EarlyView.
Abstract Quinoa (Chenopodium quinoa Willd.) is an Andean grain crop introduced as a novel crop to many parts of the world in recent years. Recognized for nutritious seeds and high abiotic stress tolerance, it has been promoted as an element of climate‐resilient agriculture, particularly in marginal environments.
Anna Tabea Mengen, Damir Esenaliev, Jakhongir Babadjanov, Lukas John, Sandra M. Schmöckel, Botir Khaitov   +5 more
wiley   +1 more source

The Impact of New Agricultural Operating Entities on Farmers' Adoption of Green Production Practices: Evidence From China

Land Degradation &Development, EarlyView.
ABSTRACT New agricultural operating entities (NAOEs) are the organizational core of modern agricultural systems, yet whether and how they draw smallholders into green production remains empirically unsettled. Using survey data from 803 vegetable growers in Shandong Province, China, and combining the coefficient of variation method, propensity score ...
Xiaoying Zhao, Qingzhi Liu, Zeyuan Li
wiley   +1 more source

Investigation on the Reasons for CO Overrun in the Return Air Corner of the Fully Mechanized Coal Mine Working Face

Abnormal CO gas concentration is one of the common problems in coal mine safety production. In view of the phenomenon of CO overrun in the working face, this paper takes the fully mechanized discharge working face of Zhaoxian Mine as the research object,
Jing Hui, Changsheng Li, Xiaojiao Cheng, Yixin Li, Lei Zhang, Wenyong Liu, Yongfei Jin, Chenyang Qi   +7 more
core   +1 more source

Effects of Fertilization and Wheat Straw Management on Rice Yield and Greenhouse Gas Emissions in Paddy Fields

Land Degradation &Development, EarlyView.
ABSTRACT Environmental pollution caused by excessive nitrogen fertilization has become increasingly serious, making optimized fertilization and straw management critical for improving agricultural sustainability. This study involved a two‐year field trial with three fertilization strategies: conventional fertilization (CF), 23.50% nitrogen reduction ...
Jiahao Xiao, Liuyun Diao, Zhicheng Xia, Pinglei Gao, Yinglong Chen, Huanhe Wei, Qigen Dai   +6 more
wiley   +1 more source