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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 2 of 2 (0.031 seconds)Spelling suggestions: "subject:"tiros"" "subject:"tirar""
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A Geochemical Analysis: Application of a Chelating Agent on Potential ASR Reactive AggregatesGarcia, Jennifer N 28 November 2011 (has links)
Alkali Silica Reaction (ASR) is a deleterious, expansive reaction in concrete. Several ASTM methods test potential aggregates for ASR risk. One method uses NaOH digestion, followed by spectroscopic methods, to estimate the amount of reactive silica present in an aggregate. NaOH, however, can digest both crystalline (i.e. quartz) and non-crystalline (e.g. opal), or poorly crystalline silica, potentially yielding falsely high estimates of reactive silica. Studies in soil and plant sciences have used Tiron, an alkaline chelating agent (C6H4S2O8Na2), as a method of digesting opaline silica for spectroscopic analysis. Here we test this approach by analyzing reactive silica in road aggregate. Tiron extraction of reactive silica is more selective, in some cases extracting only ~ 30% of the silica compared to the harsher NaOH extraction: variation is due to differences in aggregate mineralogy, specifically SiO2. In conducting chelation analyses, UV/VIS seems to be a better approach than AA.
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Hemmung der p38-MAP-Kinase und der Produktion von Superoxidradikalen erhöht die dehnungs-induzierte myokardiale Kraftentwicklung / Inhibition of p38 MAP kinase and inhibition of reactive oxygen species increase stretch-induced myocardial force developmentNguyen, Thuy-Trang 16 January 2012 (has links)
No description available.
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