نتایج جستجو برای: scattering layer

تعداد نتایج: 391535  

Journal: :Applied optics 2009
Dmitry Yudovsky Laurent Pilon

We present computationally efficient and accurate semiempirical models of light transfer suitable for real-time diffuse reflectance spectroscopy. The models predict the diffuse reflectance of both (i) semi-infinite homogeneous and (ii) two-layer media exposed to normal and collimated light. The two-layer medium consisted of a plane-parallel slab of finite thickness over a semi-infinite layer wi...

Journal: :Biomedical optics express 2013
Manu Sharma Ricky Hennessy Mia K Markey James W Tunnell

A two-layer Monte Carlo lookup table-based inverse model is validated with two-layered phantoms across physiologically relevant optical property ranges. Reflectance data for source-detector separations of 370 μm and 740 μm were collected from these two-layered phantoms and top layer thickness, reduced scattering coefficient and the top and bottom layer absorption coefficients were extracted usi...

2002
W. MORITZ H. JAGODZINSKI D. WOLF

The diffraction of low energy electrons from disordered overlayers adsorbed on ordered substrates is treated theoretically by an extension of Beeby’s multiple scattering method. A lattice gas model is assumed for the disordered adsorbate layer. Multiple scattering within a certain area around each atom each atom of the overlayer and within the ordered substrate is treated self-consistently, the...

Journal: :Journal of synchrotron radiation 2004
A Haznar G van der Laan S P Collins C A F Vaz J A C Bland S S Dhesi

Soft X-ray resonant magnetic scattering studies on a magnetically modulated, but nominally chemically homogenous, 5 nm Ni layer in a Cu/Ni/Cu/Co/NiO/GaAs(110) system are reported. It was possible to estimate the main chemical structure of the sample on the basis of the results from specular reflectivity and rocking scans, probing the scattering vector components in the perpendicular and in-plan...

پایان نامه :وزارت علوم، تحقیقات و فناوری - پژوهشگاه مواد و انرژی - پژوهشکده سرامیک 1392

thermal barrier coatings (tbcs) are used to provide thermal insulation to the hot section components of gas turbines in order to enhance the operating temperature and turbine efficiency. hot corrosion and thermal shocks are the main destructive factors in tbcs which comes as a result of oxygen and molten salt diffusion into the coating. in this thesis atmospheric plasma spraying was used to dep...

Journal: :Journal of physics. Condensed matter : an Institute of Physics journal 2014
Björn Wehinger Dmitry Chernyshov Michael Krisch Sergey Bulat Victor Ezhov Alexeï Bosak

Single crystals of ice Ih, extracted from the subglacial Lake Vostok accretion ice layer (3621 m depth) were investigated by means of diffuse x-ray scattering and inelastic x-ray scattering. The diffuse scattering was identified as mainly inelastic and rationalized in the frame of ab initio calculations for the ordered ice XI approximant. Together with Monte-Carlo modelling, our data allowed re...

2000
J. N. Schulman

In this paper we consider a new superlattice system consisting of alternating layers of CdTe and HgTe constructed parallel to the (001) zincblende plane. The tight-binding method is used to calc~late the electronic properties of this system, in particular, band edge and interface properties. The energy gap as a function of layer thickness is determined. It is found to decrease monotonically wit...

2000
A. C. Alonzo T. C. McGill

In this paper, we report the observation, through optical microscopy, of drumhead-like patterns in square and circular mesas which have been wet thermally oxidized to completion. Micro-Raman spectroscopy measurements are used to show that these patterns roughly correspond to variations in strain induced in surrounding semiconductor layers by the oxidation process. In addition, the patterns have...

Journal: :Applied optics 2005
James A Lock

The Debye series decomposition of the partial-wave scattering amplitudes of a multilayer sphere is derived. The partial-wave transmission and reflection terms appearing in the Debye series are multiple-scattering amplitudes written in terms of four basic quantities and combined together layer by layer in an identical way. The resulting expressions are then used to calculate the scattered intens...

2001
Francisco Gámiz Juan B. Roldán Hans Kosina Tibor Grasser

We have made use of a stepped doping profile to improve the performance of strained-Si ultra-short MOSFETs. Electron mobility curves are calculated by a Monte Carlo simulator including electron quantization and Coulomb scattering, in addition to phonon and surface roughness scattering. In the first part of the paper, the effect of Coulomb scattering due to both interface charges and bulk impuri...

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