نتایج جستجو برای: scattering intensity

تعداد نتایج: 290912  

2002
Jose Antonio Sanchez-Gil Francisco Gonzalez

By means of the extinction-theorem method, previously reported by J. M. Soto-Crespo and M. Nieto-Vesperinas [J. Opt. Soc. Am. A 6, 367 (1989)], the intensity statistics of the s-polarized electromagnetic field scattered from randomly rough, perfectly conducting, one-dimensional surfaces are studied in the case of surface transverse correlation lengths larger than the wavelength. In particular, ...

2014
R. E. Whitfield D. J. Goossens A. J. Studer J. S. Forrester

Single crystal diffuse scattering was collected on the Wombat high-intensity powder diffractometer at the OPAL reactor at the Bragg Institute. The difficulty in measuring diffuse scattering comes from its relatively low intensity compared to the Bragg peaks, a factor of 10−10 smaller. Wombat allows collection of diffuse scattering due to its high intensity and large two-dimensional detector. Di...

Journal: :iranian journal of radiation research 0
v. changizi department of medical physics, faculty of medicine, tehran university of medical sciences, tehran, iran m.a. oghabian department of medical physics, faculty of medicine, tehran university of medical sciences, tehran, iran s. sarkar department of medical physics, faculty of medicine, tehran university of medical sciences, tehran, iran r.d. speller department of medical physics and bioengineering, university college london, london wc1e 6ja, uk a. arab kheradmand department of medical physics, faculty of medicine, tehran university of medical sciences, tehran, iran

abstract background: coherent scattering leads to diffraction effects and especially constructive interferences. theseinterferences carry some information about the molecular structure of the tissue. as breast cancer isthe most widespread cancer in women, this project evaluated the application of small anglex-ray scattering (saxs) for differentiation between normal and cancerous breast tissues....

Journal: :Applied optics 2005
Edouard Berrocal Dmitry Y Churmakov Vadim P Romanov Mark C Jermy Igor V Meglinski

Sprays and other industrially relevant turbid media can be quantitatively characterized by light scattering. However, current optical diagnostic techniques generate errors in the intermediate scattering regime where the average number of light scattering is too great for the single scattering to be assumed, but too few for the diffusion approximation to be applied. Within this transitional sing...

2008
M.-J. Wang

The scattering characteristic of paraxial gaussian beam from two dimensional dielectric rough surfaces is studied in this paper. The modification of the Kirchhoff approximation theory for rough surface scattering by an incident gaussian beam instead of a plane wave are developed based on conventional Kirchhoff scattering theory and plane wave spectrum expansion method. The coherent and incohere...

2003
E. V. Makeev S. E. Skipetrov

We study the second harmonic generation (SHG) in a suspension of small spherical particles confined within a slab, assuming undepleted pump and applying (i) single scattering approximation and (ii) diffusion approximation. In the case (i), the angular diagram, the differential and total cross-sections of the SHG process, as well as the average cosine of SH scattering angle are calculated. In th...

2014
Keding Yan Shu Jiang Zhenhua Li

In order to study the space distribution characteristics of light scattering from random rough surfaces, the linear filtering method is used to generate a series of Gaussian randomly rough surfaces, and the Kirchhoff Approximation is used to calculate the scattered light intensity distribution from random metal and dielectric rough surfaces. The three characteristics of the scattered light inte...

Journal: :Journal of Automated Methods and Management in Chemistry 2008
Guang-ming Xian Jin-ping Qu Bi-qing Zeng

This paper describes an effective on-line polymer characterization technique by using small-angle light-scattering (SALS) image processing software and wavelet analysis. The phenomenon of small-angle light scattering has been applied to give information about transparent structures on morphology. Real-time visualization of various scattered light image and light intensity matrices is performed ...

2017
Andrew J Allen Fan Zhang R Joseph Kline William F Guthrie Jan Ilavsky

The certification of a new standard reference material for small-angle scattering [NIST Standard Reference Material (SRM) 3600: Absolute Intensity Calibration Standard for Small-Angle X-ray Scattering (SAXS)], based on glassy carbon, is presented. Creation of this SRM relies on the intrinsic primary calibration capabilities of the ultra-small-angle X-ray scattering technique. This article descr...

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