Results 11 to 20 of about 1,396,249 (309)

Mitigating Risks in Coal Mining: Simulation-Based Strategy for Oxidation Zone Control Using Inorganic Paste Backfill at the Working Face Corners

Applied Sciences, 2023
Insufficient stability of the top plate at the corner of an easily combustible coal seam comprehensive mining face may lead to a natural fire within the goaf. While corner sealing is crucial for minimizing air leakage, current sealing methods struggle to
Lei Sun, Chong Li, Zhijun Xu, Lianhai Tai, Yue Cao, Xiaowu Zhang   +5 more
doaj   +3 more sources

DETERMINATION OF THE RATIONAL GEOMETRICAL PARAMETERS OF PLATE TYPE ELEMENTS OF MAGNETIC MATRIX OF THE POLYGRADIENT SEPARATOR

Electrical engineering & Electromechanics, 2018
Introduction. Polygradient magnetic separation has wide application in industry and in biomedicine. Working process in polygradient separators takes place in a matrix, magnetic elements of which create magnetic forces sufficient to remove small ferro ...
Juraj Gerlici, I. A. Shvedchikova, J. A. Romanchenko, I. V. Nikitchenko   +3 more
doaj   +1 more source

The significance of distance constraints in peasant farming systems with special reference to sub-Saharan Africa [PDF]

, 1985
Analysis of agricultural development potential at village level tends to neglect the factor of relative location, compared with the attention paid to physical resources and economic factors.
McCall, M.K.
core   +7 more sources

Research on spontaneous combustion 'three zones' in goaf of fully mechanized working face with large mining height

Gong-kuang zidonghua, 2019
In view of goaf spontaneous combustion prevention of 12401 fully mechanized working face with large mining height in Shangwan Coal Mine, CO is determined as prediction index gas of coal spontaneous combustion and C2H4 is used as auxiliary index gas to ...
QU Shijia, AN Shigang, WU Fusheng, LI Peng   +3 more
doaj   +1 more source

Calculation of Coalbed Methane Resources in Mining Stability Zone Based on Gas Emission

Meikuang Anquan, 2020
To calculate the coalbed methane resources in the stable area affected by coal mining, firstly, based on the height of roof caving zone and the water conducting fracture zone, the depth of floor failure zone, and the limit gas emission width of coal ...
LI Dan
doaj   +1 more source

The Change in the Shape Characteristics of the Plastic Zone in the Surrounding Rock of an Auxiliary Retracement Channel and a Reasonable Channel Spacing Determination Method

Applied Sciences, 2023
In underground coal mines, the stability of the retracement channel in the surrounding rock is crucial for the safe and efficient retracement of the equipment and to guarantee the continuity of the retracement work.
Xu Gao, Chenyi Liu, Hongkai Zhang, Kunlin Yang, Yingjie Hu, Xiaofei Guo   +5 more
doaj   +1 more source

Numerical simulation study on the evolution characteristics of the stress induced by mining in deep adjacent working faces

Geoenvironmental Disasters, 2023
Background The mining-induced stress in the surrounding rock after coal seam mining is the primary cause of damage and failure of the surrounding rock in the mining area.
Shoulong Ma, Mingwei Zhang, Lu Ma, Zhuangcai Tian, Xue Li, Zhenhao Su   +5 more
doaj   +1 more source

Technology and application of dynamic pressure gas secondary drainage through borehole in bottom drainage roadway of high gas outburst coal seam

Meikuang Anquan, 2022
In order to solve the problem of gas overrun and low utilization rate caused by mining pressure relief gas pouring into mining working space in high gas outburst coal seam, this paper used numerical simulation and field application methods to study the ...
LI Yanhe, ZHAI Cheng, DING Xiong
doaj   +1 more source

Rationale of the quantity of soil-cutting stars and working body of soil rotary knives [PDF]

E3S Web of Conferences, 2021
This article considers the main parameters of the experimental rotary working body (RWB) used for tillage and opening of buried vines in the protection zone between rows, soil loosening and weeding blades in the protection zone of the crop protection ...
Obidov Abdulkhay, Turakulov Mamaraym, Ermatov Valijon, Yusufaliev Abdurakhmon   +3 more
doaj   +1 more source

Axial and Radial Investigation of Hydrodynamics in a Bubble Column;Influence of Fluids Flow Rates and Sparger Type [PDF]

, 2006
A detailed investigation of local hydrodynamics in a pilot plant bubble column has been performed using various techniques, exploring both axial and radial variations of the gas hold-up, bubble average diameter and frequency, surface area.
Billet, Anne-Marie, Chaumat, Hélène, Delmas, Henri   +2 more
core   +2 more sources