Results 81 to 90 of about 4,107 (241)

Mechanisms of Roadway Instability and Coupled Control Technology for Working Face Passing Through Fault Zones

Energy Science &Engineering, EarlyView.
This study mainly explores the instability characteristics of roadways near faults in the working face. Taking the 51104 transportation roadway of the 51104 working face in Shengxin Coal Mine as the main research object, through theoretical analysis, borehole inspection, numerical simulation and on‐site mine pressure observation, the instability ...
Shuaifeng Yin, Yitao Yan, En Wang, Xubo Zhao, Kanglei Han   +4 more
wiley   +1 more source

Research on Crack Propagation and Stress Propagation in Coal‐Rock Combinations Under Different In Situ Stresses Subjected to Blasting Loads

Energy Science &Engineering, EarlyView.
A stress wave propagation model for coal‐rock combinations under in situ stress was established. Taking a coal mine in Huainan, China as the engineering background, isotropic and anisotropic numerical models were constructed. Field engineering practices were carried out to verify the reliability of the conclusions.
Jianyu Zhang, Guangming Chen, Meiyao Li, Xinyu Wang, Yuting Liu, Renjie Cui, Yixin Gong   +6 more
wiley   +1 more source

Clinical periodontal diagnosis

Periodontology 2000, EarlyView., 2023
Abstract Periodontal diseases include pathological conditions elicited by the presence of bacterial biofilms leading to a host response. In the diagnostic process, clinical signs such as bleeding on probing, development of periodontal pockets and gingival recessions, furcation involvement and presence of radiographic bone loss should be assessed prior ...
Giovanni E. Salvi, Andrea Roccuzzo, Jean‐Claude Imber, Alexandra Stähli, Björn Klinge, Niklaus P. Lang   +5 more
wiley   +1 more source

Characteristics and mechanism of strong dynamic load mine pressure in large mining height full-mechanized caving face with multiple thick and hard roof

Meitan xuebao
In view of the problems of strong mine pressure such as rapid shrinkage of hydraulic support column and easy support crushing in working face under the fully mechanized caving face with large mining height in multi-layer thick and hard roof of extra ...
Zhen ZHANG, Zhizeng HUANG, GANG XU, Xiaogang LIU, Qianjin LIU, Tielin ZHAO, Xingyu LIN   +6 more
doaj   +1 more source

Optimization of Blasting‑Induced Roof Cutting Parameters in Key Stratum and Its Application in Gob‑Side Entry Retention Technology

Energy Science &Engineering, EarlyView.
This study addresses hard roof coal seam conditions by optimizing key stratum blasting‐cutting parameters through theoretical analysis, numerical simulation, and field tests. It proposes calculation methods for blast hole spacing and delay timing based on stress wave theory, controlling roadway deformation within 35 mm, thereby enhancing resource ...
Qiong Liu, Duanxiang Fu, Hongbin Li
wiley   +1 more source

In Situ Studies on the Characteristics of Strata Structures and Behaviors in Mining of a Thick Coal Seam with Hard Roofs

Energies, 2018
The movements of overburden induced by mining a thick coal seam with a hard roof extend widely. The effects of breakages in the hard strata on the strata behaviors might vary with the overlying strata layers.
Yiwen Lan, Rui Gao, Bin Yu, Xiangbin Meng   +3 more
doaj   +1 more source

Shaping Manager Well‐Being and Functioning in Declining Nonprofit Organizations: The Critical Role of Strategy Implementation

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

Synergistic reinforcement using pressure releasing and energy absorbing method under hard roof: Physical model test

Journal of Rock Mechanics and Geotechnical Engineering
During fully mechanized caving mining of thick coal seams, a large amount of strain energy accumulates in the roof, especially when the roof is thick and hard, making it difficult for the roof to collapse naturally.
Qi Wang, Jiting Liu, Bei Jiang, Zhenhua Jiang, Yusong Deng, Chuanjie Xu   +5 more
doaj   +1 more source

Mechanical and Impact Response of Adhesively Bonded ASA/PA12 Sandwich Structures Produced by Fused Filament Fabrication

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, Bayram Yildiz, Tolgahan Ermergen, Çağın Bolat   +3 more
wiley   +1 more source

Fonio (Digitaria exilis and Digitaria iburua) in Nigeria: Regional cultivation patterns, landrace diversity, and farmer knowledge for conserving a climate‐resilient indigenous cereal

PLANTS, PEOPLE, PLANET, EarlyView.
Fonio (Digitaria exilis and Digitaria iburua) cereals are valued for their drought resilience, adaptability to poor soils, and cultural importance. In Nigeria, where both species are cultivated, fonio has declined due to labor‐intensive processing, lower yields, and changing livelihood choices. By documenting 21 landraces (15 D. exilis and 6 D. iburua),
Ishaq Muawiyya, Abubakar Bello, George P. Burton, Philippa Ryan, Maria S. Vorontsova   +4 more
wiley   +1 more source