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Protein degradation and RNA efflux of viruses photocatalyzed by graphene-tungsten oxide composite under visible light irradiation
, Article Journal of Physical Chemistry C ; Volume 116, Issue 17 , 2012 , Pages 9653-9659 ; 19327447 (ISSN) ; Choobtashani, M ; Ghaderi, E ; Sharif University of Technology
2012
Abstract
Graphene-tungsten oxide composite thin films with sheetlike surface morphology were fabricated and applied in photoinactivation of viruses under visible light irradiation. Using X-ray photoelectron spectroscopy, it was found that the chemically exfoliated graphene oxide sheets incorporated in the tungsten oxide film reduced through a visible light photocatalytic reduction. In addition, annealing the films at 450 °C in air resulted in formation of W-C and W-O-C bonds to obtain graphene-tungsten oxide composite films. The composite films fabricated by this method showed an excellent visible light photocatalytic performance in photoinactivation of bacteriophage MS2 viruses, as compared to...
Effect of high energy ball milling on compressibility of nanostructured composite powder
, Article Powder Metallurgy ; Volume 54, Issue 1 , Nov , 2011 , Pages 24-29 ; 00325899 (ISSN) ; Farnoush, H. R ; Asgharzadeh, H ; Sadrnezhaad, S. K ; Sharif University of Technology
2011
Abstract
Compressibility of a nanostructured Al-5AlN composite powder synthesised via high energy ball milling for various times was studied by means of a modified Heckel equation. Since workhardening and morphological changes take place by milling evolution, the compressibility was consequently affected. Strengthening of composite compacts was influenced by milling and compaction processes, i.e. strength of compacts increased at longer milling times and higher compaction pressures. It was found that, at the initial stages of milling and higher compaction pressures, the strengthening was mostly affected from compaction process, whereas the milling strengthening fraction was near to unity at lower...
Application of temperature transient analysis for welltest interpretation and well productivity evaluation
, Article Society of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition, Jakarta, Indonesia,October 30–November 1, 2007 ; 2007 ; 9781613990407 (ISBN) ; Siavoshi, J ; Sharif University of Technology
2007
Abstract
During transient tests, both pressure and temperature are changed depending on downhole flow rate. In gas producing wells, Joule-Thomson cooling and frictional heating effects are the main dynamic factors causing flowing bottomhole temperature to differ from the static formation temperature at that depth. When a gas well is shut in, JT cooling effect is vanished and this causes a sharp increase in sandface temperature. As effect of wellbore storage ends, wellbore temperature gradually cools down due to heat conduction with near wellbore region. This paper demonstrates a new technique for using temperature transient data in gas wells in order to determine end of wellbore storage. Also, effect...