09:15 May 17, 2013 |
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English to Serbian translations [Non-PRO] Science - Physics / kinetic testing | |||||||
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Summary of answers provided | ||||
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4 +1 | test (standardne) ćelije vlažnosti |
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4 +1 | ispitivanje ćelije vlažnosti |
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5 -1 | Ispitivanja vlažnosti ćelije |
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Summary of reference entries provided | |||
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Humidity cells |
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Discussion entries: 2 | |
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test (standardne) ćelije vlažnosti Explanation: http://www.sgs.rs/sr-Latn-CS/Sustainability/Facilities-and-P... Reference: http://www.astm.org/Standards/D5744.htm |
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ispitivanje ćelije vlažnosti Explanation: http://www.sgs.rs/en/Construction/Services-Related-to-Materi... Reference: http://www.sgs.rs/en/Construction/Services-Related-to-Materi... |
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Ispitivanja vlažnosti ćelije Explanation: Ispitivanja vlažnosti ćelija |
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8 days |
Reference: Humidity cells Reference information: http://ecorestoration.montana.edu/mineland/guide/prediction/... Technologies for Prediction TECH GUIDE Laboratory Methods: Kinetic Geochemical Testing: Humidity Cells Humidity (weathering) cells are a common kinetic test that alternately purges a sample with humid air and ambient humidity creating a humid environment conducive to pyrite oxidation. Crushed rock samples from various overburden locations at a particular mine site are placed in plastic chambers that are connected by tubing to a reservoir from which humid air is pumped. During the moist air cycle, wet conditions are maintained in the particle pore spaces. Oxidation of sulfides occurs but oxidation products generally remain dissolved in the pore water immediately adjacent to the particle. Any acidic pore water in the vicinity of acid neutralizing minerals reacts with these minerals. During the dry air cycle, pore water evaporates. This leads to concentration of dissolved ions in the pores and probable precipitation of salts on particle surfaces. Hydrated precipitates may partially dehydrate and stabilize (e.g. Fe(OH)3 � FeOOH + H2O). Water is periodically added to the chambers allowing oxidation products formed during the wet/dry cycle to dissolve and come into contact with neutralizing minerals. The leachate is then extracted and analyzed (MEND, 2000). Humidity cells are intended to provide a direct measurement of acid generation and consumption rates under fully oxygenated conditions such as the immediate exposed surface of a tailings deposit. However, they do not provide a simulation of leaching conditions in wastes which may be partially or fully saturated and oxygen-deprived. Leaching columns are generally set up to address these issues. -------------------------------------------------- Note added at 8 days (2013-05-25 13:37:25 GMT) -------------------------------------------------- Da, ja mislim da je upravo tako, (plastic chambers) i ostavila bih "ćelije vlažnosti". Ovaj tekst je očigledno pisan za stručnjake iz date oblasti, oni će svakao znati o čemu se radi. :-) |
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