Reinvestigation of the Proton Resonance Spectrum of Vindolinine at 300 MHz

Reinvestigation of the proton resonance spectrum of vindolinine at 300 MHz.

A reinvestigation of the proton resonance spectrum of vindolinine based on new data at 300 MHz is now completely consistent with the recently modified structure. These data are presented as an example of possible pitfalls in the interpretation of complex spectral data for structural analysis. Spectra and assignments are included.

APPLICATION OF ULTRASONIC RESONANCE TECHNIQUE AT 300 MHz TO THE DETECTION OF DISBONDS IN

This paper describes the results of work on the feasibility of using high frequency ultrasound to determine .the degree of bondedness of multilayer structures. A sandwich structure of two identical metal sheets of thickness on the order of 25 ~m, bonded together by a dissimilar third layer of thickness 10 ~m was examined. The primary disbond was expected to be in the region of the interface bet...

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 proton-magnetic-resonance spectrum of pencolide.

conditional 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...