Results 101 to 110 of about 1,343,112 (224)
Energy Science &Engineering, EarlyView.This study on close coal seams shows that multi‐seam mining increases the height of the fractured zone from approximately 26 m (single upper‐seam mining) to about 49 m. When the lower seam is mined after the extraction of the upper seam, the heights of both the caved zone and the fractured zone increase by approximately two times.
Xiaoyu Wu +4 more
wiley +1 more source
Geomechanics and Geophysics for Geo-Energy and Geo-ResourcesThick hard roof with high strength, large breaking step and strong mine pressure is one of the major problems in coal mine safety production. Aiming at the problems of large thickness, high strength and difficult collapse of the roof slab of Yadian Coal ...
Shuo Ren +6 more
doaj +1 more source
Energy Science &Engineering, EarlyView.This study systematically investigates the fracture development mechanisms of water‐isolating soil layers under the coupled effects of repeated mining and groundwater seepage during the downward mining of shallow‐buried coal seams. The findings provide a theoretical basis for evaluating stratum stability and preventing roof water inrush.
Tao Yang +7 more
wiley +1 more source
Nonprofit Management and Leadership, EarlyView.ABSTRACT Under the roof of Christian churches in Central Europe, some nonprofit organizations (NPOs) grow, while others are in marked decline. Our study in this context extends a previous focus on financial indicators to NPO managers' experiences, their role clarity and job satisfaction, during phases of organizational growth and decline. Specifically,
Max Niehoff, Johannes Stark
wiley +1 more source
Environmental Impact of Silicic Magmatism in Large Igneous Province Events
Geophysical Monograph Series, Page 133-151., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Scott E. Bryan
wiley +1 more source
Polymer Engineering &Science, EarlyView.Adhesively bonded ASA/PA12 FFF sandwich structures reveal that interfacial compliance governs mechanical performance. Cyanoacrylate enhances strength but induces brittle failure, while polyurethane improves ductility and impact resistance, demonstrating that adhesive properties and stacking sequence are critical design parameters for optimizing multi ...
Berkay Ergene +3 more
wiley +1 more source
Thick and hard roof poses safety hazards to initial mining and caving of the working face due to its good integrity and large modulus. Taking the initial mining of No.
Yuxuan Wang +4 more
core +1 more source
Key technologies for intelligent, efficient, and safe mining of impact thick coal seams due to hard roof [PDF]
To address the challenges of source-based rock burst elimination and efficient mining in ultra-thick coal seams prone to rock bursts due to hard roofs, a safety assurance technology was developed to create a favorable environment for intelligent and ...
Xiangbin MENG +8 more
core +1 more source
Evaluation of Polyolefin Encapsulants for Roll‐to‐Roll Lamination Applications
Progress in Photovoltaics: Research and Applications, EarlyView.Polyolefin encapsulants, PO1 and PO3, show best compatibility with R2R lamination, balancing flow, thermal properties and aging resistance. ABSTRACT Mass Customization (MC) in photovoltaic (PV) manufacturing enables the production of diverse, cost‐effective integrated PV products through the use of semi‐fabricates.
P. Christöfl +4 more
wiley +1 more source
Applied SciencesIn view of the high-level, thick, and hard roof in a mine in Shaanxi, it is difficult for existing technology to solve the problem of frequent rock bursts, which are caused by the direct weakening of the whole underground layer.
Qianyue Gu +5 more
doaj +1 more source