نتایج جستجو برای: mcnp 4a
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This Article contains an error in Figure 4A where the graphs were labelled incorrectly. The correct Figure 4A appears below as Figure 1.
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...
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...
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...
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...
Location of the active site and proposed catalytic mechanism of pterin-4a-carbinolamine dehydratase.
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...
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. ...
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...
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