Results 111 to 120 of about 166,116,027 (191)

Relationship between long pressure short extraction dust removal performance and dust source movement path in comprehensive heading face of coal mines

Meitan xuebao
Long pressure short extraction ventilation and dust removal method is one of the effective methods for removing high mass concentration dust in the excavation area of coal mine comprehensive heading face. Especially, the local flow field generated by the
Bingyou JIANG, Yifan WANG, Hanyi LIN, Haoyu WANG, Yang ZHAO   +4 more
doaj   +1 more source

Making Mining Licit: Gold, Commodification, and the Everyday Performance of Law in Colombia

American Anthropologist, Volume 128, Issue 3, Page 480-493, September 2026.
ABSTRACT Ethnographies of resource‐making have shown that the extraction of resource value from objects is premised on obviating the emplaced lifeworlds that surrounded objects before they traveled to consumer markets. Much of this literature looks at such supply‐chain disentanglement from the viewpoint of corporate and formal regulatory practices ...
Jesse Jonkman
wiley   +1 more source

Study on unsteady diffusion characteristics of primary coal and tectonic coal under the influence of pressure and particle size [PDF]

In order to further study the characteristics of gas desorption and diffusion in coal, the gas desorption and diffusion experiments of primary coal and tectonic coal with different gas pressures (0.8, 1.3, 2.4, 3.3 MPa) and different particle sizes (0 ...
Zhanyou SA, Lurui TAN, Shouqing LU, Jie LIU, Yujin QIN, Yongliang ZHANG   +5 more
core   +1 more source

Trace Elements in Total Atmospheric Deposition Directly Measured Over the Caribbean Region: Natural Versus Anthropogenic Sources and Geographic Origin

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 16, 28 August 2026.
Abstract Dust, sea salt, and anthropogenic and biogenic particles in total atmospheric deposition are sources of essential elements that can significantly impact biogeochemical cycles in the Atlantic Ocean and in islands of the Caribbean region. This unique 41‐month data set records direct sampling of total atmospheric deposition from March 2015 to ...
Yangjunjie Xu‐Yang, Rémi Losno, Céline Dessert, Fabrice Monna, Damien Guinoiseau, Antoine Cogez, Carmela Chateau‐Smith   +6 more
wiley   +1 more source

Effects of particle size distribution on the explosion severity of coal dust

, 2019
The effects of particle size distribution (PSD) on coal dust explosion severity were investigated using a 20 L vessel. The severity was evaluated by the maximum explosion pressure (Pex), the maximum rate of pressure rise ((dP/dt)ex), and the time spans ...
Hejun Zhou (7215179), Fangchao Nie (7215176), Longhao Sun (3695332), Jiangshi Zhang (7215173)   +3 more
core   +1 more source

6th International Conference on Aeolian Research (ICAR VI)

, 2006
Spatial and temporal variations in vegetation and soil surface conditions of rangelands add a level of complexity to wind erosion processes which is often difficult to model or measure.
Butler, Harry J., Hogarth, W. L., McTainsh, G. H.   +2 more
core   +1 more source

CFD–DPM Analysis of Coal-Dust Transport and Near-Portal Dispersion from an Open-Top Coal Train in a Railway Tunnel

Atmosphere
Coal dust carried by open-top freight trains can undergo complex transport and redistribution in confined railway tunnels, where train-induced airflow links in-tunnel particle motion to near-portal dispersion.
Shengwen Chen, Yi Zhang, Haoyao Gui, Chuncheng Yu, Xinke Wang   +4 more
doaj   +1 more source

Investigation of Coal Properties and Airborne Respirable Dust Generation [PDF]

"Laboratory crushing experiments were conducted on a range of low- to high-volatile bituminous coals to investigate the various factors influencing airborne respirable dust (ARD) generation.

core  

Factors affecting the kinetics of froth flotation [PDF]

, 1989
In this research work, three types of flotation models (discrete, mean rate and the gamma function models) are modified based on the relationship between mass recovery and recovery. The modified models can be used to calculate both the recovery and grade
Zhang, Jian-Gou, Zhang, J
core  

Compound preparation and performance evaluation of biodegradable dust suppressant agent for ultrafine coal dust

The problems such as poor wettability of ultrafine coal dust (mass fraction of coal dust with a particle size less than 5 μm is not less than 50%) have seriously restricted the effect of mine dust control.
Xiang HAN, Qirui WANG, Anning ZHOU, Kanshe LI, Gang LI, Qiulin LI, Qiuhong WANG, Yan JIN, Fuxin CHEN   +8 more
core   +1 more source