75 results for “Silica”

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Research ArticleOpen accessIn the abstractTHE GROUP COMPOSITION OF METAL COMPOUNDS IN SOIL AS AN INDEX OF SOIL ECOLOGICAL STATESaglara Sergeevna Mandzhieva, Tatiana Mikhailovna Minkina, Svetlana Nikolaevna Sushkova et al.A system of indices for assessing the soil ecological state as based upon the group composition of heavy metal compounds in soils is proposed. The group composition of heavy metal were determined using combined fractionation including sequential and parallel extractions (1 N NH4Ac, pH 8; 1% EDTA in NH4Ac and 1 N HCl). It was shown that strongly bound compounds … …American Journal of Agricultural and Biological Sciences, Vol. 9, Issue 1 · 7 Dec 2013 · 7,595 accessesView PDF Cite

Research ArticleOpen accessIn the abstractEpoxy Insulators’ Lifetime Prediction Implementing Neural Network TechniqueL. S. Nasrat, A. M. IbrahimDue to wide implementation of Epoxy insulators in industrial applications and its economic implications; development of various Epoxy insulator materials has to be evaluated along with a reliable prediction methodology of their lifetimes. In this study, a new methodology based on Artificial-Neural-Networks (ANN) is developed to predict Epoxy insulators lifetime using laboratory measurements of their surface leakage current under accelerated … …American Journal of Engineering and Applied Sciences, Vol. 5, Issue 2 · 7 Aug 2012 · 7,791 accessesView PDF Cite

Research ArticleOpen accessIn the abstractX-Ray Diffraction and X-Ray Fluorescent Analyses of Prehistoric Pottery Shards from Ulu KelantanZuliskandar Ramli, Nik Hassan Shuhaimi Nik Abdul Rahman, Adnan Jusoh, Yunus SaumanProblem statement: X-Ray Diffraction (XRD) and X-Ray Fluorescent (XRF) were used in order to obtain mineralogical and elemental composition of seven pottery shards that have been unearthed during the excavation at Peraling Cave and Cha Cave in Ulu Kelantan, Malaysia. Approach: Peraling Cave and Cha Cave were prehistoric sites dating from 10, 000 BC which were inhabited by Hoabinhian people … …American Journal of Applied Sciences, Vol. 8, Issue 12 · 20 Oct 2011 · 7,753 accessesView PDF Cite

Research ArticleOpen accessIn the abstractOptical Properties of the SiO2-Na2O-CaO-Nd2O3 GlassesP. Chimalawong, J. Kaewkhao, T. Kittiauchawal et al.Problem statement: This study researched on different physical and optical properties of Nd3+ doped soda-lime-silicate glass. The glasses containing Nd3+ in (65-x) SiO2: 25Na2O: 10CaO: xNd2O3 (where x = 0.0-5.0 mol%) had been prepared by melt-quenching method. The density and molar volume increase with increasing of Nd2O3 concentration due to increasing of Non Bridging Oxygens (NBOs) in glass matrix. Approach: … …American Journal of Applied Sciences, Vol. 7, Issue 4 · 30 Apr 2010 · 7,953 accessesView PDF Cite

Research ArticleOpen accessIn the abstractSeasonal Variations of n-6: n-3 Ratios and Fatty Acid Compositions in Foot and Tissue of Chiton lamyi in a High Primary Productivity AreaNooshin Sajjadi, Peyman Eghtesadi-Araghi, Shahla Jamili et al.Problem statement: Fatty acid content and composition in mollusks is a function of their feeding diversity. Chabahar bay located in the northern part of Oman sea in Indian ocean provides high rates of primary productivity and a diverse food source for mollusks in this area. Identification of fatty acid compositions of Chiton lamyi and study their seasonal changes in the … …American Journal of Environmental Sciences, Vol. 5, Issue 3 · 30 Jun 2009 · 7,198 accessesView PDF Cite