نتایج جستجو برای: xrf method
تعداد نتایج: 1632639 فیلتر نتایج به سال:
Tributyltin (TBT) and other organotin compounds have been restricted for use on leisure boats since 1989 in the EU. Nonetheless, release of TBT is observed from leisure boats during hull maintenance work, such as pressure hosing. In this work, we used a handheld X-ray Fluorescence analyser (XRF) calibrated for antifouling paint matrixes to measure tin, copper and zinc in antifouling paints coat...
Context. X-ray flashes (XRFs) are a class of gamma-ray bursts (GRBs) with a peak energy of the time-integrated ν Fν spectrum, Ep, typically below 30 keV, whereas classical GRBs have Ep of a few hundreds of keV. Apart from Ep and the systematically lower luminosity, the properties of XRFs, such as their duration or spectral indices, are typical of the classical GRBs. Yet, the nature of XRFs and ...
X-ray flashes (XRFs) and X-ray rich gamma-ray bursts (XRGRBs) share many observational characteristics with long duration (& 2 s) GRBs, but the reason for which the spectral energy distribution of their prompt emission peaks at lower photon energies, Ep, is still a subject of debate. Although many different models have been invoked in order to explain the lower values of Ep, their implications ...
(109)Cd-based K-shell X-ray fluorescence spectrometry (hereafter, for brevity, XRF) is used, often in epidemiological studies, to perform non-invasive, in vivo measurements of lead in bone. We conducted the first interlaboratory study of XRF via the circulation of nine goat tibiæ in which the mean lead value ranged from 4.0 µg g(-1) to 55.3 µg g(-1) bone mineral. The test tibiæ were subsequentl...
In this research work, iron modified titanium dioxide photocatalyst was synthesized by the sol-gel method. The catalyst is characterized by FT-IR, XRF, and TGA techniques. Since the activity of Fe/TiO2 is highly affected by the loading of Fe, our major purpose of this work was focused on the role of this factor. Moreover, the effect of calcination temperature, which was also of high importance,...
This thesis uses early-time and simultaneous data from all three instruments on-board Swift to explore how the conditions of long Gamma-Ray Bursts (GRBs) and their envi ronment affect their observed prompt and afterglow properties. I firstly analyse two long GRBs with properties that distinguish them from the more standard class of long GRB; XRF 050406 and GRB 061007. The X-Ray Flash XRF 05040...
Poly-lactide-co-glycolide (PLGA) is one of the few polymers approved by the US Food and Drug Administration as a carrier for drug administration in humans; therefore, it is one of the most used materials in the formulation of polymeric nanoparticles (NPs) for therapeutic purposes. Because the cellular uptake of polymeric NPs is a hot topic in the nanomedicine field, the development of technique...
a simple hydrothermal method was designed for the synthesis of the nanostructure barium phosphonate in presence of cetyltrimethylammonium bromide (ctab) or sodium dodecyl sulfate (sds) as surfactant. ft-ir, edax, xrf, xrd, sem were used to characterize this material. effect of solvent on morphology complex was discussed. thermogr avimetric analysis (tga) shows the existence of porosity and stab...
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