نتایج جستجو برای: mcnp 4a

تعداد نتایج: 6956  

2017
Wei Song Lin Tang Yumei Xu Jing Xu Wenwen Zhang Hui Xie Shui Wang Xiaoxiang Guan

This Article contains an error in Figure 4A where the graphs were labelled incorrectly. The correct Figure 4A appears below as Figure 1.

2007
Hashem Miri Hakimabad Hamed Panjeh

Response functions of a 3×3 in. NaI detector, which is mainly used in PGNAA applications, have been calculated by using MCNP-4C code. Calculated results are compared with measured data by using standard γ-ray sources to check their accuracy. γ-rays from radioisotope sources were used in the range from 0.081 to 4.438 MeV for this determination. Through the precise modeling of the detector struct...

2007
Hashem Miri Hakimabad Hamed Panjeh Alireza Vejdani-Noghreiyan

Response functions of a 3×3 in. NaI detector, which is mainly used in PGNAA applications, have been calculated by using MCNP-4C code. Calculated results are compared with measured data by using standard -ray sources to check their accuracy. -rays from radioisotope sources were used in the range from 0.081 to 4.438 MeV for this determination. Through the precise modeling of the detector structur...

2008
Ananthram Swami

oEE We study the problem of quantization for distributed parameter estimation in large scale sensor networks. Assuming a Maximum Likelihood estimator at the fusion center, we show that the Fisher Information is maximized by a scoreD 2 function quantizer. This provides a tight bound on best possible MSE for any unbiased estimator. Furthermore, we Y. show that for a general convex metric, the opt...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده علوم پایه 1392

با توجه به نقش اشعه ایکس در درمان تومورها و همچنین نیاز به چشمه های نوترون جهت کاربرد های پزشکی و صنعتی تولید یک چشمه اشعه ایکس کم حجم و کم هزینه دارای اهمیت است. در این کار با استفاده از طیف های الکترونی حاصل از بر هم کنش لیزر-پلاسما ابتدا تولید اشعه ایکس تابش ترمزی در هدف های مختلف با استفاده از کد mcnpx شبیه سازی شد. هدف از این کار بدست آوردن جنس بهینه و ضخامت بهینه برای هدف های مختلف جهت با...

Journal: :European journal of biochemistry 1996
S Köster G Stier R Ficner M Hölzer H C Curtius D Suck S Ghisla

Based on the recently solved three-dimensional structure of pterin-4a-carbinolamine dehydratase from rat/human liver the involvement of the proposed active-site residues Glu57, Asp60, His61, His62, Tyr69, His79, Arg87 and Asp88 was examined by site-directed mutagenesis. Most of the mutants showed reduced activity, and only the Glu57-->Ala mutant and the His61-->Ala, His62-->Ala double mutant we...

Journal: :The Journal of biological chemistry 1993
S S Patel M M Hingorani

The oligomeric structure of bacteriophage T7 gene 4 helicase/primase proteins was investigated using protein cross-linking and high pressure gel-filtration chromatography. Studies were carried out with both 4A' and 4B proteins. 4A' is a M64L mutant of 4A which has similar helicase and primase activities as the wild-type mixture of 4A and 4B proteins (Patel, S. S., Rosenberg, A. H., Studier, F. ...

Journal: :Journal of the American Society for Mass Spectrometry 2010
XianZhen Zhao Zilan Xiao D J Douglas

Mass analysis with islands of stability has been investigated with three linear quadrupole mass filters: two with 4% added hexapole fields constructed with equal diameter (quadrupole 4A) and unequal diameter (quadrupole 4B) rods, and a conventional round-rod quadrupole that has apparently been slightly damaged. Islands are formed by applying auxiliary quadrupole excitation. With the Mathieu par...

Journal: :Progress in Nuclear Science and Technology 2014

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