Properties of Dust Clouds of Novel Hydrogen-Containing Alloys

This paper first addresses the question: what is a dust explosion? Afterwards, some specific issues are briefly reviewed: materials that can give dust explosions, factors influencing ignitability and explosibility of dust clouds, the combustion of dust clouds in air, ignition sources that can initiate dust explosions, primary and secondary dust explosions, dust flash fires, explosions of “hybrid mixtures”, and detonation of dust clouds. Subsequently, measures for dust explosion prevention and mitigation are reviewed. The next section presents the case history of an industrial dust explosion catastrophe in China in 2014. In the final section, a brief review is given of some current research issues that are related to the prevention and mitigation of dust explosions. There is a constant need for further research and development in all the areas elucidated in the paper.

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Driving in the Dust: Challenges and Lessons Learned from Field Testing in Degraded Visual Environments

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/1071181320641462 ◽

2020 ◽

Vol 64 (1) ◽

pp. 1916-1920

Author(s):

Kayla L. Riegner ◽

Kelly S. Steelman

Keyword(s):

Research Program ◽

Field Tests ◽

Field Testing ◽

Driving Performance ◽

Lessons Learned ◽

Current Paper ◽

Ground Vehicle ◽

Significant Safety ◽

Dust Clouds

Degraded visual environments (DVEs) pose significant safety and efficiency problems in military ground vehicle operations. As part of a larger research program, two field tests were conducted to evaluate driving aids while indirect driving in DVEs. The current paper presents the results of one of these field tests, and focuses on the challenges and lessons learned in designing a challenging test course and producing consistent dust clouds for assessing Soldier driving performance and workload in degraded visual environments.

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R Coronae Borealis Stars: Long-Term Photometric & Spectroscopic Studies

Highlights of Astronomy ◽

10.1017/s1539299600021298 ◽

1998 ◽

Vol 11 (1) ◽

pp. 379-379

Author(s):

P.L. Cottrell ◽

L. Skuljan ◽

P.M. Kilmartin ◽

C. Gilmore ◽

W.A. Lawson

Keyword(s):

Radial Velocity ◽

Spectroscopic Studies ◽

Photometric Data ◽

Decline Phase ◽

Dust Clouds ◽

Medium Resolution ◽

Formation And Evolution ◽

R Coronae Borealis Stars ◽

Insight Into

For more than a decade we have been able to acquire and analyse a significant amount of photometric data of the highly variable R Coronae Borealis (RCB) stars. This has made been possible by a photometric service observing programme instigated at the Observatory. These photometric data have been combined with less extensive spectroscopic coverage, particularly of the decline phase of these stars. These have been supplemented by observations obtained at Mount Stromlo and Siding Spring Observatories for a radial velocity study. Significantly more spectroscopic observations are now being acquired with the development of a new medium resolution spectrograph at Mount John University Observatory. In this poster we will present recent photometric and spectroscopic results for a number of the RCB stars in our sample. This observational and analysis work can be used to provide further insight into the nature of these stars, their likely progeny and progenitors and the processes that are involved in the formation and evolution of the obscuring dust clouds which cause the decline phase.

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Explosion of Aluminum Powder Dust Clouds

Industrial & Engineering Chemistry ◽

10.1021/ie50330a005 ◽

1937 ◽

Vol 29 (6) ◽

pp. 626-631 ◽

Cited By ~ 12

Author(s):

Ralph B. Mason ◽

Cyril S. Taylor

Keyword(s):

Aluminum Powder ◽

Dust Clouds

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Dust, Clouds, Rain Types, and Climatic Variations in Tropical North Africa

Quaternary Research ◽

10.1016/0033-5894(82)90018-7 ◽

1982 ◽

Vol 18 (1) ◽

pp. 1-16 ◽

Cited By ~ 60

Author(s):

Jean Maley

Keyword(s):

North Africa ◽

Atmospheric Electricity ◽

Thunderstorm Activity ◽

Tropical Africa ◽

Tropical Zone ◽

Climatic Variations ◽

Dust Clouds ◽

Climatic Evolution ◽

Cloud Thickness ◽

Second Period

AbstractDust and processes of raindrop formation in the clouds play a very important role in the climatic evolution of tropical north Africa. Sedimentologic, stratigraphic, pedologic, geomorphologic, and palynologic data converge to show that a major environmental change occurred in tropical Africa about 7000 yr B.P. In the Sudanian and Sudano–Guinean zones (wet tropical zone), from 15,000 to 7000 yr B.P., rivers deposited mostly clay, while from 7000 to 4000 yr B.P. they deposited mostly sand. During the first period, pedogenesis was vertisolic (montmorillonite dominant), associated with pollen belonging mostly to vegetation typical of hydromorphic soils, while during the second period pedogenesis was of ferruginous type (kaolinite dominant) with pollen belonging mostly to vegetation typical of well-drained soils. The great change near 7000 yr B.P. is linked chiefly to a major hydrological change that appears related to a change in the size of raindrops: from fine rains associated with considerable atmospheric dust (raindrop diameter essentially less than 2 mm) to the second period associated with thunderstorm rains (raindrop diameter mostly greater than 2 mm). The size of raindrops is related particularly to cloud thickness and dust concentration in the troposphere. Thunderstorm activity is influenced also by fluctuations of the atmospheric electricity, modulated by the sun.

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Dust clouds around red giant stars: Evidence of sublimating comet disks?

Icarus ◽

10.1016/0019-1035(89)90122-x ◽

1989 ◽

Vol 81 (1) ◽

pp. 24-30 ◽

Cited By ~ 3

Author(s):

John J. Matese ◽

Daniel P. Whitmire ◽

Ray T. Reynolds

Keyword(s):

Giant Stars ◽

Dust Clouds ◽

Red Giant Stars ◽

Red Giant

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Quenching distance of laminar flame in aluminum dust clouds

Combustion and Flame ◽

10.1016/0010-2180(95)00183-2 ◽

1996 ◽

Vol 105 (1-2) ◽

pp. 147-160 ◽

Cited By ~ 82

Author(s):

S Goroshin ◽

M Bidabadi ◽

J.H.S Lee

Keyword(s):

Laminar Flame ◽

Dust Clouds ◽

Quenching Distance

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Johann Kiessling, the Krakatoa event and the development of atmosheric optics after 1883

Notes and Records the Royal Society journal of the history of science ◽

10.1098/rsnr.2000.0110 ◽

2000 ◽

Vol 54 (2) ◽

pp. 249-258 ◽

Cited By ~ 1

Author(s):

W. Schröder ◽

K-. H. Wiederkehr

Keyword(s):

Nuclear Physics ◽

Cloud Chamber ◽

Physical Explanation ◽

Dust Clouds

Johann Kiessling studied the sensational twilights that followed the eruption of Krakatoa (1883) and looked for their physical explanation. He believed that the cause of the extraordinary optical appearances essentially lay in diffraction through particles in the condensation and dust clouds which, following the eruption of the volcano, reached high strata in the atmosphere and travelled around the globe. Research concerning the generation of fog in the atmosphere was greatly forwarded by Kiessling's ideas and experiments. The studies of C.T.R. Wilson, F.R.S., which led to the construction of his cloud chamber and its use in nuclear physics, were strongly influenced by Kiessling's work.

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