Results 151 to 160 of about 40,102 (196)

Possible mechanism of brightness outbursts of comets

Kinematics and Physics of Celestial Bodies, 2010
The mechanism of brightness outbursts of comets based on selective absorption of solar ultraviolet radiation by hydrogen atoms in the cometary head is considered. Due to this process, influence of the radiation on parent and daughter molecules in the near-nucleus region of the cometary head is different.
F. I. Kravtsov, I. V. Lukyanyk
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Mechanism investigation on coal and gas outburst: An overview

International Journal of Minerals, Metallurgy and Materials, 2020
Coal and gas outburst is a frequent dynamic disaster during underground coal mining activities. After about 150 years of exploration, the mechanisms of outbursts remain unclear to date. Studies on outburst mechanisms worldwide focused on the physicochemical and mechanical properties of outburst-prone coal, laboratory-scale outburst experiments and ...
Yan-kun Ma, Bai-sheng Nie, Xue-qiu He, Xiang-chun Li, Jun-qing Meng, Da-zhao Song   +5 more
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Application of Coal Mechanics in Coal and Gas Outbursts

2021
Coal and gas outbursts are geological failures that occur in underground drainage or mining, and consist of the ejection of thousands of coal/rock pieces and a considerable amount of gas into a limited working space within a short period.
Yuanping Cheng, Qingquan Liu, Ting Ren
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A mechanism of outbursts of coal and gas

Mining Science and Technology, 1984
Abstract Rock and gas pressures combine to cause outbursts of coal and gas. The actions and interactions of geological factors, mining factors and intermediary events during the phenomenon are described.
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Physical Mechanism of Comet Outbursts: An Experimental Result

Icarus, 1993
Attention is given to an experimental investigation of the physical mechanism of comet outbursts which is consistent with the general picture of mantle presence on comets and clarifies the relation of mantles to eruptive activity. The experiment and closeup observation of Comet P/Halley suggest a result different from most mathematical models in that ...
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Modelling of outbursts at #26 Colliery, Glace Bay, Nova Scotia. Part 2: Proposed outburst mechanism and model

Mining Science and Technology, 1990
Abstract The outbursts experienced at #26 Colliery originated from within sandstone river channels just above the coal seam. The outburst mechanism proposed here can be used to model the outbursts experienced at this mine quantitatively. The mechanism treats an outburst as a series of instantaneous, static events driven by tensile failures within the
K. Barron, D. Kullmann
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Tunnelling outburst potential affected by mechanical properties of coal seam

Tunnelling and Underground Space Technology, 2019
Abstract Coal and gas outburst is greatly affected by the stress distribution in front of the heading face when tunnelling in high gassy coal seam. In this paper, the FLAC3D software and Mohr-Coulomb failure criterion are used to study the stress differences in front of the heading face.
Wei Yang, Changzheng Lu, Baiquan Lin, Jianguo Zhang, Minghua Lin, Hao Wang   +5 more
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Comet Outbursts: Linking Gas Composition Changes to Trigger Mechanisms

2023
Dust outbursts observed during the Rosetta mission on comet 67P/Churyumov-Gerasimenko have produced spectacular images described as fireworks in the literature (Vincent et al., 2016). Nevertheless, little has been published about the in-situ composition of the gas released during these outbursts, as well as the underlying mechanisms that trigger such ...
Müller, Daniel, Altwegg, Kathrin, Berthelier, Jean-Jacques, Combi, Michael, de Keyser, Johan, Fuselier, Stephen, Hänni, Nora, Rubin, Martin, Wampfler Susanne, F.   +8 more
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Mechanism research on coal and gas outburst during vibration blasting

Safety Science, 2012
The coal and gas outburst results from plenty of factors, while vibration is the most important factor among them. Therefore, the influences of vibration acting on gas desorption and coal structure had been conducted. And the mechanism of coal and gas outburst induced by vibration was illustrated through examples.
Nie Baisheng, Li Xiangchun
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Mechanism of methane outbursting in coal seams

Mining informational and analytical bulletin, 2020
I.E. Kolesnichenko, E.A. Kolesnichenko, E.I. Lyubomishchenko, E.I. Kolesnichenko   +3 more
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