نتایج جستجو برای: آزمایش xrf
تعداد نتایج: 68535 فیلتر نتایج به سال:
Applicability of PGAA on pottery archaeometry has been proved in investigations of pre-Columbian figurines from Venezuela. PGAA is a non-destructive bulk analytical method, capable to determine concentration of majorand some trace components. We take part in the MÖB-DAAD project aimed to investigate Hungarian Neolithic pottery, and also in an IAEA CRP with more methodological objectives. Within...
The gamma-ray burst (GRB) / X-ray flash (XRF) events GRB031203, discovered by INTEGRAL, and XRF 060218, discovered by Swift, represent two of only five GRB-SNe with optical spectroscopic confirmation of their SN components. Yet their observed high-energy properties offer a sharp contrast: While GRB031203 was detected as a short 40-s burst with a spectrum peaking at Epeak > 190 keV, XRF060218 wa...
We present new classes of permutation polynomials over finite fields. If q is the order of a finite field, some polynomials are of form xrf(x(q−1)/d), where d|(q − 1). Other permutation polynomials are related with the trace function. 2000 Mathematics Subject Classification: Primary 11T06.
X-ray Flashes (XRFs) are, like Gamma-Ray Bursts (GRBs), thought to signal the collapse of massive stars in distant galaxies. Many models posit that the isotropic equivalent energies of XRFs are lower than those for GRBs, such that they are visible from a reduced range of distances when compared with GRBs. Here we present the results of two epoch Hubble Space Telescope imaging of two XRFs. These...
Friedreich ataxia (FA) is an autosomal recessive disease with a complex neurological phenotype, but the most common cause of death is heart failure. This study presents a systematic analysis of 15 fixed and 13 frozen archival autopsy tissues of FA hearts and 10 normal controls (8 frozen) by measurement of cardiomyocyte hypertrophy; tissue frataxin assay; X-ray fluorescence (XRF) of iron (Fe) an...
This study aims to document the changes in modern pollen assemblages and soil elemental chemistry along broad edaphic, hydrological, and salinity gradients, including a previously undocumented secondary environmental gradient, in a vast mangrove-dominated wetland region in the Everglades, South Florida. Twenty-five soil surface samples were collected along an interior wetland transect and an es...
A novel type of ultra-high vacuum instrument for X-ray reflectometry and spectrometry-related techniques for nanoanalytics by means of synchrotron radiation (SR) has been constructed and commissioned at BESSY II. This versatile instrument was developed by the PTB, Germany’s national metrology institute, and includes a 9-axis manipulator that allows for an independent alignment of the samples wi...
Fresh and freeze-dried sample sections of the coastal macroalgae, Fucus serratus and F. vesiculosus, and the brackish water macroalga, F. ceranoides, have been analysed for trace elements by field-portable-X-ray fluorescence (FP-XRF) spectrometry using a Niton XL3t in a low density mode with thickness correction. When analysed fresh in a laboratory accessory stand for a period of 200 seconds, A...
هدف: هدف مطالعه حاضر طراحی و ارزیابی الگوی برنامه درسی همدلی برای دانش‌آموزان دختر دوره تحصیلی متوسطه دوم بود. به این منظور ابتدا با بررسی، تحلیل مبانی نظری دیدگاه صاحب‌نظران دو رشته‌ی مطالعات روانشناسی عناصر دست آمد، سپس میزان کاربردی بودن آن هم از متخصصان در مقام اجرا بین مورد بررسی قرار گرفت.مواد روش‌ها: طرح پژوهش نوع آمیخته اکتشافی متوالی کیفی-کمی است که روش محتوای کیفی قیاسی بخش پیشنهادی ل...
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