نتایج جستجو برای: neutron backscattering

تعداد نتایج: 50336  

2010
X. X. Cheng H. S. Chen X. M. Zhang

In this paper, the backscattering properties of a perfect electric conducting sphere coated with layered anisotropic media whose constitutive parameters are close to nihility are investigated. We show that the backscattering is more sensitive to the radial constitutive parameters than to the tangential ones. Compared with isotropic case, the anisotropic media with small axial parameters have th...

2004
E. Fuchs P. Dollfus G. Lecarval E. Robilliart S. Barraud D. Villanueva H. Jaouen

For fast computation of drain current in Nano-MOSFET, we have developed a new backscattering model based on the accurate determination of ballistic and backscattering probabilities along the channel. The main elements of this model are deduced from careful analysis of transport in devices using Monte Carlo simulation. The backscattering coefficient is in very good agreement with the results of ...

2011
Yisok Oh

This paper presents soil moisture retrieval form measured polarimetric backscattering coefficients of a vegetation field. The backscattering coefficients of soybean field were measured by scatterometer(HPS: Hongik Polarimetric Scatterometer) system in 2010. Surface soil moisture is retrieved using measured backscattering coefficients. Surface scattering of soybean field is extracted using semi-...

ژورنال: سنجش و ایمنی پرتو 2020

Neutron Generators (NG) are used as a neutron source for different applications. During recent years, major efforts are underway to develop a high yield compact NG. In this way, radiation protection aspects need to be considered during the operation of these high yield NGs. In this paper the neutron effective dose of a NG operator has been calculated using MCNPX Monte Carlo code. The results sh...

2015
Bernd Stühn Michael Vogel

Ferrocene is an organometallic molecular sandwich complex with an iron atom coordinated between two cyclopentadienyl rings. The reorientation of these rings in a process of rotational jump diffusion between multiple equilibrium sites on a circle is investigated using quasielastic neutron time of flight and backscattering spectroscopy experiments. Existing results on the ring rotation in bulk, c...

Background: One of the main causes of induction of secondary cancer in radiation therapy is neutron contamination received by patients during treatment.Objective: In the present study the impact of wedge and block on neutron contamination production is investigated. The evaluations are conducted for a 15 MV Siemens Primus linear accelerator. Methods: Simulations were performed using MCNPX Monte...

ژورنال: سنجش و ایمنی پرتو 2015

In this study, a mixture of waste lead mine Nakhlak and cement with different percentages of boric acid are used to construct a proper shield for gamma and neutron radiations emitted from the Am-Be source. Neutron dose rate reduction ​​by the prepared samples was investigated by thermal neutron irradiation system of Isfahan University, TLD 600 and TLD 700. Neutron dose rate changes, compressive...

Journal: :Journal of large-scale research facilities JLSRF 2015

Journal: :Clinical cancer research : an official journal of the American Association for Cancer Research 2006
Hemant K Roy Young L Kim Yang Liu Ramesh K Wali Michael J Goldberg Vladimir Turzhitsky Jonathan Horwitz Vadim Backman

INTRODUCTION Our group has been interested in applying advances in biomedical optics to colorectal cancer risk stratification. Through a recent technological breakthrough, we have been able to harness information from enhanced backscattering spectroscopy, an optics phenomenon that allows quantitative, depth-selective analysis of the epithelial microscale/nanoscale architecture. In the present s...

Journal: :Optics express 2007
A L Whitmire E Boss T J Cowles W S Pegau

The spectral dependency of the particulate backscattering ratio is relevant in the fields of ocean color inversion, light field modeling, and inferring particle properties from optical measurements. Aside from theoretical predictions for spherical, homogeneous particles, we have very limited knowledge of the actual in situ spectral variability of the particulate backscattering ratio. This work ...

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