Results 81 to 90 of about 7,653 (230)

Two new records for the flora of Paraguay: Stemodia diplohyptoides and S. lobelioides (Plantaginaceae:Gratioleae)

Nordic Journal of Botany, Volume 2026, Issue 3, March 2026.
Stemodia diplohyptoides M.M.Sosa & Dematt. and S. lobelioides Lehm. (Gratioleae, Plantaginaceae) are reported for the first time in Paraguay, found in Alto Paraná and Presidente Hayes departments, respectively. These new records extend the known geographical range of both species, representing the northern records to date, S.
Y. Carlés Bechara, S. Y. Gauto, V. R. Kubota, O. A. Feltes González, M. M. Sosa   +4 more
wiley   +1 more source

Stability Evaluation of the Goaf Based on Combination Weighting and Cloud Model

Advances in Civil Engineering
Goaf has become one of the most significant sources of hazard affecting the safety of metal and nonmetal mines. Evaluation of goaf stability is of paramount importance for mine safety production.
Linning Guo, Kepeng Hou, Huafen Sun, Yong Yang   +3 more
doaj   +1 more source

Research on gas drainage drilling parameters and nitrogen injection for fire prevention in goaf

Gong-kuang zidonghua, 2020
Drilling and drainage can affect movement of air flow in goaf, thus leading to changes in goaf flow field, and increasing air leakage in goaf. At the same time, there is a state of negative pressure around the borehole, and the air leakage and air flow ...
CUI Chuanfa
doaj   +1 more source

Distributed Fiber Optic‐Based Monitoring and Analysis of Flexible Molded Concrete Piers for Coal Pillar Free Mining

Energy Science &Engineering, Volume 14, Issue 1, Page 412-427, January 2026.
Using the pillarless mining face at Zhaozhuang Coal Mine as a case study, the research objective is to accurately and comprehensively understand the stress distribution and its evolution characteristics in flexible concrete pillars along the hollow support pillars under the influence of secondary mining movements during pillarless coal mining ...
Yanhui Zhu, Ye Tian, Peilin Gong, Kang Yi, Tong Zhao   +4 more
wiley   +1 more source

Study on the evolutions of temperature and oxygen in the goaf of nearly vertical coal seam after low-temperature nitrogen injection

Case Studies in Thermal Engineering
The near vertical coal seam adopts a segmented mining method to form a layered composite goaf, and its spontaneous combustion law is more complex. In order to understand the evolution law of temperature and oxygen after injecting low-temperature nitrogen
Gang Wang, Shuliang Xie, Enmao Wang, Ruida Hao   +3 more
doaj   +1 more source

Research on the Evolution Law of the Plastic Zone and Control Technologies for Surrounding Rock in Floor Roadway Influenced by Mining Activities

Energy Science &Engineering, Volume 14, Issue 1, Page 444-459, January 2026.
ABSTRACT This study addresses the challenges of deformation failure and the difficulty in controlling the surrounding rock in the 2453 floor roadway of a coal mine in Hunan Province, influenced by mining activities. Conducting an in‐depth investigation into the evolution law of the principal stress and stability control technologies for the surrounding
Shihai Shu, Weijun Wang, Yujie Ma, Chao Yuan, Xinyu Tian, Rongjie Du, Sha Ge   +6 more
wiley   +1 more source

A symmetry-guided mirror reconstruction method for filling large gaps in TLS surveys of mining subsidence

Frontiers in Earth Science
Surface subsidence induced by coal mining is one of the most prominent anthropogenic geological hazards in mining areas. In terrestrial laser scanning (TLS) surveys of subsidence basins, point cloud data are often incomplete due to unavoidable surface ...
Zijian Wang, Youfeng Zou, Youfeng Zou, Huabin Chai, Mingwei Song, Mingwei Song   +5 more
doaj   +1 more source

Effects on Buildings of Surface Curvature Caused by Underground Coal Mining [PDF]

, 2016
Ground curvature caused by underground mining is one of the most obvious deformation quantities in buildings. To study the influence of surface curvature on buildings and predict the movement and deformation of buildings caused by ground curvature, a ...
Chen, S. (Shengyun), Hu, H. (Haifeng), Lian, X. (Xugang)   +2 more
core  

Synthesis and hydration mechanism of a steel‐making by‐product based quaternary binder suitable for superfine tailings

Journal of the American Ceramic Society, Volume 109, Issue 1, January 2026.
• A novel low‐cost SQB was synthesized and optimized for CSTB. • The synergistic hydration mechanism of sulfate‐activated LS with alkali–sulfate‐activated GGBFS in SQB was revealed. • The SQB has effectively consolidated ST, which have significant potential for both environmental and economic benefits.
Faguang Yang, Adeolu Adediran, Chuqing Jiang, Yangmei Yu, Prince Allah, Chao Lyu, Xiaoyu Li, Tuan Van Truong, Julson aymard Tchio, Nikhil Rathod, Priyadharshini Perumal   +10 more
wiley   +1 more source

Two-dimensional inverse problem of fire location in the closed goaf of coal mine based on optical fiber sensors.

PLoS ONE
Monitoring the temperature to determine the fire source locations is essential for controlling the spontaneous combustion in the goaf. Optical fiber sensors are employed to measure the temperature distribution in the goaf.
Yujiao Liu, Lu Chen, Kaiping Wang, Zeyi Liu, Yao Zhang, Lianzeng Shi, Ke Gao, Zemiao Yang   +7 more
doaj   +1 more source