منابع مشابه
The structure of the kaolinite minerals FT-Raman study
AB S T R A C T : The Fourier transform Raman spectra of the kaolinite minerals have been measured in the 50-3800 cm -1 region using near infrared spectroscopy. Kaolinites are characterized by remarkably intense bands in the 120-145 cm -I region. These bands, attributed to the O-Si--O and O-A1-O symmetric bending modes, are both polymorph and orientation dependent. The 200-1200 cm -I spectral ra...
متن کاملFirst-order Raman spectrum of diamond at high temperatures.
Continue on revere if necessary and identify by block number) Measurements of the first order Raman spectrum in natural type Ila diamond for the temperature range of 293 K to 1850 K are presented. Both the Stokes and anti-Stokes components are analyzed for their intensity, Raman shift, and width variation with temperature. Optical pyrometry was used to make the temperature measurements, the res...
متن کاملconditional copula-garch methods for value at risk of portfolio: the case of tehran stock exchange market
ارزش در معرض ریسک یکی از مهمترین معیارهای اندازه گیری ریسک در بنگاه های اقتصادی می باشد. برآورد دقیق ارزش در معرض ریسک موضوع بسیارمهمی می باشد و انحراف از آن می تواند موجب ورشکستگی و یا عدم تخصیص بهینه منابع یک بنگاه گردد. هدف اصلی این مطالعه بررسی کارایی روش copula-garch شرطی در برآورد ارزش در معرض ریسک پرتفویی متشکل از دو سهام می باشد و ارزش در معرض ریسک بدست آمده با روشهای سنتی برآورد ارزش د...
the role of application of dynamic assessment approach in improvement of iranian efl writing performance at different language proficiency levels
the present study sought to investigate the role of dynamic assessment (da) in improvement of iranian efl writing performance at different language proficiency levels. to this end, after conducting the quick placement test, 60 iranian efl learners were assigned to two groups with different language proficiency levels. in both groups each participant wrote two compositions, one before and one af...
The Raman spectrum of isolated water clusters.
Cold water oligomers (H2O)n and (D2O)n with n = 2-5 are assigned in spontaneous Raman scattering spectra of seeded rare gas expansions for the first time. Comparison with infrared spectra provides direct experimental insights into the hydrogen bond-mediated excitonic OH oscillator coupling, which is responsible for ultrafast energy transfer between water molecules, usually suppressed by isotopi...
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ژورنال
عنوان ژورنال: Canadian Journal of Chemistry
سال: 1986
ISSN: 0008-4042,1480-3291
DOI: 10.1139/v86-048