نتایج جستجو برای: mcnp monte carlo code

تعداد نتایج: 236688  

2012
Chao Liang Wei Ji

This paper presents an accurate and efficient approach to optimize radiation transport simulations in a stochastic medium of high heterogeneity, like the Very High Temperature Gas-cooled Reactor (VHTR) configurations packed with TRISO fuel particles. Based on a fast nearest neighbor search algorithm, a modified fast Random Sequential Addition (RSA) method is first developed to speed up the gene...

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پایان نامه :دانشگاه بین المللی امام خمینی (ره) - قزوین - دانشکده فنی 1390
شیرزاد عبدی, کریم افشار, نوشین بیگدلی,

تعیین مکان و اندازه بهینه منابع تولید پراکنده (dgs) در سیستم های توزیع برای کسب ماکزیمم منافع بالقوه با اهمیت می باشد. در این پایان نامه یک طراحی چند هدفه برای تعیین مکان و اندازه منابع dg در شبکه های توزیع موجود مبتنی بر روش ipso-monte carlo ارائه شده است. اهداف شامل مینیمم کردن تلفات اکتیو و راکتیو، بهبود پروفایل ولتاژ و بهبود قابلیت اطمینان سیستم های توزیع می باشد. تکنیک بکار رفته مبتنی بر ا...

15 صفحه اول
Journal: :SoftwareX 2021

In this study, Gxsview (Geometry and CROSS Section VIEWer), which is a stand-alone multi-platform integrated visualization tool for 3D geometry, 2D cross section, input file, was developed. Its geometry engine covers almost all geometric features used in the major Monte Carlo radiation transport code, PHITS MCNP, supporting nested universe, fill, lattice, like-but, complement functions. The vie...

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Journal: :journal of medical signals and sensors 0

an important need in radiation therapy is a fast and accurate treatment planning system. this system using ct data and characteristics of the radiation beam, calculates the dose in all points of the patient’s volume. two main factors in planning system are “accuracy” and “speed”. according to these factors, various generation of treatment planning systems are developed.   this article is the re...

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2005
Jaakko Leppänen

This paper presents a new assembly-level Monte Carlo neutron transport code, specifically intended for diffusion code group-constant generation and other reactor physics calculations. The code is being developed at the Technical Research Centre of Finland (VTT), under the working title “Probabilistic Scattering Game”, or PSG. The PSG code uses a method known as Woodcock tracking to simulate neu...

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Journal: :AECL Nuclear Review 2012

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Journal: :Medical physics 2005
C Avila J Lopez J C Sanabria G Baldazzi D Bollini M Gombia A E Cabal C Ceballos A Diaz Garcia M Gambaccini A Taibi A Sarnelli A Tuffanelli P Giubellino A Marzari-Chiesa F Prino E Tomassi P Grybos M Idzik K Swientek P Wiacek L M Montaño L Ramello M Sitta

Dual-energy mammographic imaging experimental tests have been performed using a compact dichromatic imaging system based on a conventional x-ray tube, a mosaic crystal, and a 384-strip silicon detector equipped with full-custom electronics with single photon counting capability. For simulating mammal tissue, a three-component phantom, made of Plexiglass, polyethylene, and water, has been used. ...

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Journal: :Radiation research 2017
David Welch Leah Turner Michael Speiser Gerhard Randers-Pehrson David J Brenner

Anatomically accurate phantoms are useful tools for radiation dosimetry studies. In this work, we demonstrate the construction of a new generation of life-like mouse phantoms in which the methods have been generalized to be applicable to the fabrication of any small animal. The mouse phantoms, with built-in density inhomogeneity, exhibit different scattering behavior dependent on where the radi...

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2015
Yue Guan Shifei Shen Hong Huang

A great number of radioactive cesium were released into sea water after Fukushima Accident. We modified the Regional Oceanic Modelling System (ROMS) to reproduce the dispersion process of the cesium in oceans. The simulated water concentration was in good agreement with observation. In order to explore the nuclear impact of these contaminant in ocean, we established a food web model to calculat...

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2003
Jan Kyncl

The contribution deals with numerical solution to the problem of criticality for neutron transport equation using the source iteration method. Especially question of convergence of iterations is examined. It is inferred that a slow convergence can be expected if optical thickness of the space region considered is large. For such a case it is next shown that the results may strongly be affected ...

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