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E. Querol J.G. Torrent D. Bennett J. Gummer J.-P. Fritze 《Journal of Loss Prevention in the Process Industries》2006,19(6):639-644
This paper reports some experimental work on hot surface ignition temperatures of dust deposits. Dust layers up to 75 mm in depth were ignited using a modified version of the standard 5 mm layer apparatus. The measured ignition temperatures show good agreement with predictions using the method given in EN 50281-2-1. Ignition temperatures of conical dust deposits over an electrically heated box were not predictable, but were not too dissimilar from the ignition temperatures of the thick layers. Both tests gave adequate reproducibility in round robin tests. Rotating steel wheels in contact, immersed in a dust deposit produce the frictional hot surfaces. A relation between the power lost by friction and the surface temperature developed has been derived. The surface temperatures leading to ignition were close to the ignition temperatures for the conical deposits on the heated box. The similarities between the ignition temperatures of dust deposits in several configurations indicate that a simple test for ignition temperature measurement could have wide application in dusty environments. 相似文献
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The Northern River Ecosystem Initiative (NREI), 1997–2004, has provided new scientific knowledge in response to specific recommendations from its predecessor, the Northern River Basins Study (NRBS), 1990–1996. The two initiatives together provide a remarkable body of science which is, and will continue to be, used by resource managers responsible for economic and environmental sustainability in the northern watersheds of Alberta. The NREI focused its investigative efforts on improving our understanding related to ecological considerations of changes in river flow, effect of climate change on flow, ecological responses to pollution and cumulative effects, vulnerability of drinking water quality, and to a lesser degree, wildlife (birds) response to large scale changes within the watersheds. Key findings are briefly presented in this paper and discussed in greater detail in the other NREI papers included in this. Commensurate with the undertakings of NREI, provincial and territorial governments, First Nation and Métis communities, and other administrative organizations such as the Mackenzie River Basin Board, undertook policy, regulatory, and watershed initiatives towards achieving sustainability and providing reliable drinking water quality. 相似文献
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水稻杂交后代表观直链淀粉质量分数与蜡质基因(CT)n微卫星多态性的相关性 总被引:2,自引:0,他引:2
以来自2 个水稻杂交组合的后代遗传群体为材料,研究了蜡质基因( Wx) 微卫星标记(CT)n 多态性与稻米表观直链淀粉质量分数( w(AA)) 之间的相关性. 第1 个群体是浙农8010 与嘉育293 的杂交F6 代育种品系,双亲均为籼稻,w(AA) 分别为8 .7% 和25.6 % ,Wx 基因型为分别为(CT)18(CT)18 和(CT)11(CT)11 .另一群体为CM101 与IGRA409 杂交F5 家系,亲本CM101 为一个粳型糯稻,Wx 基因型为(CT)18(CT)18 ;IGRA409 为籼稻,w(AA) = 27.5% ,Wx 基因型为(CT)11(CT)11 .结果发现,在2 个杂交组合的后代群体中,高w(AA) 材料Wx 基因型均为(CT)11(CT)11 ,低w(AA) 及糯稻的均为(CT)18(CT)18 ,中等w(AA) 材料的则为(CT)18(CT)11 的杂合体.统计分析表明,Wx 基因型与w(AA)之间存在显著的相关性,在浙农8010×嘉育293 和CM101 ×IGRA409 两个群体中相关系数分别达0 .9509 和0.9704. 相似文献
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