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排序方式: 共有239条查询结果,搜索用时 8 毫秒
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Rossi Lucía Palacio Magdalena Villabrille Paula I. Rosso Janina A. 《Environmental science and pollution research international》2021,28(19):24112-24123
Environmental Science and Pollution Research - V-doped TiO2 materials (0.01, 0.05, 0.10, and 1.00 nominal atomic %) were synthesized by the sol-gel method and characterized by X-ray diffraction,... 相似文献
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Luc Véchot Tomasz Olewski Carmen Osorio Omar Basha Yi Liu Sam Mannan 《Journal of Loss Prevention in the Process Industries》2013,26(3):398-409
The prediction of the potential hazards associated to accidental liquefied natural gas (LNG) spills has motivated a number of different studies including experimental and numerical approaches. Most of these studies focus on dispersion predictions, however there is limited information regarding source term of it: liquid spill and vaporization. There is a need of further improvements on the understanding of these phenomena and the quantification of the most important parameters that can affect them.The vaporization of cryogenic liquids is governed by the heat transfer phenomena including conduction, convection and thermal radiation mechanisms. The present work investigates the contribution of each of these heat transfer modes to the vaporization rate of cryogenic liquid nitrogen (LN2) contained in a Dewar flask using well controlled and instrumented laboratory scale experiments. LN2 vaporization rate was measured with individually controllable contributions from convective (generated by an electric fan) and thermal radiative (generated by light bulb) heat transfer in the presence of a baseline conductive heat transfer rate.In both cases of convection and radiation analysis the experimental study showed that they can play a significant role in the vaporization rate of LN2. It was observed that the radiative heat absorbed by the LN2 during the vaporization experiment represents only 50%–65% of the incident radiation that would reach the LN2 pool surface if no vapour was present. Convective heat transfer generated by the fan was shown to have had the most significant contribution to the total heat transfer. As expected, this contribution was significantly higher than the one from bulb radiation. The experimental data also showed that the liquid level in the Dewar play a key role in the resulting amount of convective heat transfer. This could be attributed to the fact that lower liquid level the side walls of the Dewar were high enough to hold a layer of vapour and limit air motion directly above the liquid surface, thus limiting the heat transfer by convection. 相似文献
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Gérard C Poullain V Lance E Acou A Brient L Carpentier A 《Environmental pollution (Barking, Essex : 1987)》2009,157(2):609-617
Community structure and microcystin accumulation of freshwater molluscs were studied before and after cyanobacterial proliferations, in order to assess the impact of toxic blooms on molluscs and the risk of microcystin transfer in food web. Observed decrease in mollusc abundance and changes in species richness in highly contaminated waters were not significant; however, relative abundances of taxa (prosobranchs, pulmonates, bivalves) were significantly different before and after cyanobacterial bloom. Pulmonates constituted the dominant taxon, and bivalves never occurred after bloom. Microcystin accumulation was significantly higher in molluscs from highly (versus lowly) contaminated waters, in adults (versus juveniles) and in pulmonates (versus prosobranchs and bivalves). Results are discussed according to the ecology of molluscs, their sensitivity and their ability to detoxify. 相似文献
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Miranda-Carrazco Alejandra Ramírez-Villanueva Daniel Alejandro Dendooven Luc 《Environmental science and pollution research international》2022,29(17):24968-24982
Environmental Science and Pollution Research - Biosolids are a by-product of wastewater treatment, and their nutritional composition makes them ideal for fertilizing crops. However, pre-treatments,... 相似文献