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841. paper2
Next: Introduction . Database of the optical properties of chaotically oriented fractal-like clusters of spherical particles . ... Astronomical observatory of Kharkov University, Sumskaya str., 35, 61022, Kharkov, Ukraine; . ... Institute of Radio Astronomy of NASU, Chervonopraporna str., 4, 61002, Kharkov, Ukraine . Introduction . Model of clusters . ... Model realization and some results . ... About this document ... root 2003-04-11 ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/PAPER2/paper2.html -- 3.9 Кб -- 19.11.2010
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842. http://www.astro.spbu.ru/DOP/A-PERC/usrnotes.ps
Some remarks for users The code producing data for the database has been written in two languages -- Pascal and Fortran. ... The files ww 11x and ww 12x (e.g., ww 11pas, ww 11for, etc.) contain the weights of the artificial neural network (the two layer perceptron) which are used to calculate the expansion coefficients a 11 and a 12 of the scattering matrix elements S 11 and S 12 (contact the authors (link) for a code that calculates these weight for different parameter values). ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/usrnotes.ps -- 37.2 Кб -- 19.11.2010
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843. Introduction
Next: Model of clusters Up: paper2 Previous: paper2 . ... It allows estimating different microphysical properties of scatterers (size, complex refractive index, shape, etc.) from measured characteristics of the scattered radiation. ... The complexity of the direct problem depends on its input parameters characterizing the shape, size and structure of the scattering particle. ... Next: Model of clusters Up: paper2 Previous: paper2 root 2003-04-11 ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/PAPER2/node1.html -- 5.3 Кб -- 19.11.2010
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844. Model of clusters
... The most powerful and widely used methods to calculate the scattering matrix of a fractal cluster are based on the coupled dipoles methods (e.g. the Discrete Dipole Approximation, DDA) and the theory of light scattering by a cluster of spherical particles [2-4]. ... At present the procedure of calculation of the scattering matrix is well developed for both an oriented cluster of spherical particles and for chaotically oriented clusters of such particles [4]. ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/PAPER2/node2.html -- 5.8 Кб -- 19.11.2010
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845. Neural network approach
... One of the widely used models of neural network is the multi-layered perceptron [6]. The model network has layers of input and output elements called neurons. ... An input vector is put on the input layer, passes through the hidden layers, and arrives at the output layer. The corresponding output vector is determined by calculation of the neuron activity level for each layer using already known values of neuron activity of the previous layers. ... Training was an iterative process. ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/PAPER2/node3.html -- 5.6 Кб -- 19.11.2010
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846. Model realization and some results
... The perceptron structure, on the basis of which the database is built, is defined by a number of the input and output parameters and a required accuracy. ... The output perceptron data are the expansion coefficients of the scattering matrix elements in series of the generalized spherical functions. ... As the cluster structure depends on the generation conditions the expansion coefficients were averaged over 5--7 realizations of the clusters (for N . ... is the coefficient number. ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/PAPER2/node4.html -- 10.8 Кб -- 19.11.2010
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847. Database of Optical Properties -- Level: subpage
A small paper prepared by V.Tishkovets, P.Litvinov, and S.Beletsky (Kharkov Univ., Ukraina) provides the reader with a brief description of the problem, its solution, the developed software and its training (the PDF version of the paper is here ). ... Please, select the PAS subdirectory for the Pascal version of the code, and the FORT subdirectory for the Fortran version. A brief description of files and their purposes is given in our user notes (their PostScript version is here ). ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/ -- 2.6 Кб -- 19.11.2010
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848. Database of Optical Properties -- Level: subsubpage
The code producing data for the database has been written in two languages - Pascal and Fortran. ... The files ww_11x and ww_12x (e.g., ww_11pas, ww_11for , etc.) contain the weights of the artificial neural network (the two layer perceptron) which are used to calculate the expansion coefficients and of the scattering matrix elements and (please, contact the authors for a code that calculates these weight for different parameter values). ... The structure of the input file data is as follows: . ...
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Ссылки http://www.astro.spbu.ru/DOP/A-PERC/USRNOTES/index.html -- 6.4 Кб -- 19.11.2010
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849. Database of Optical Properties -- Level: subpage
... This page will contain a form to pass parameter values for a on-line working code producing figures illustrating the dependence of optical properties of different scatterers on their parameters. Specify the parameters and press start calculation button to produce a figure. ... Independent variable: x v a/b alpha Re(m)? another? ... Number of curves: 1 2 3 . ... Curve #1: . Particle shape: sphere spheroid another? TE/TM mode: TE TM . Other parameters: x= Re(m)= Im(m)= a/b= alpha= . ...
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Ссылки http://www.astro.spbu.ru/DOP/9-TOOL/index.html -- 5.4 Кб -- 19.11.2010
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850. Database of Optical Properties -- Level: subpage
Here we compare the optical properties of porous particles of two kinds: . ... Below we show the behaviour of the efficiency factors Q ext (x), Q sca (x), Q abs (x), the asymmetry parameter g (x) and albedo (x) as well as for x = 3 and 100 the phase function i (theta) and polarization of scattered radiation p (theta) for different values of the parameters m and P . ... factors . ... Qext(x) . Qsca(x) . ... i (theta) . ... albedo (x) . ...
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851. http://www.astro.spbu.ru/DOP/8-GLIB/op/ao46_4065.pdf
Effective medium theories for irregular fluffy structures: aggregation of small particles Nikolai V. Voshchinnikov,1,* Gorden Videen,2 and Thomas Henning3 2 Sobolev Astronomical Institute, St. Petersburg University, St ID 76312); published 12 June 2007 1 The extinction efficiencies as well as the scattering properties of particles of different porosity are studied. ... The comparison is made for the refractive indices of inclusions 1.33 0.01i and particle porosity mcompact 0.9. ...
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Ссылки http://www.astro.spbu.ru/DOP/8-GLIB/op/ao46_4065.pdf -- 657.5 Кб -- 19.11.2010
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[ Текст ] Ссылки http://www.astro.spbu.ru/DOP/8-GLIB/op2/ao46_4065.pdf -- 657.5 Кб -- 19.11.2010
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852. http://www.astro.spbu.ru/DOP/8-GLIB/op3/JQSRT_110_1356.pdf
... Received 29 December 20 08 Received in revised form 27 February 20 09 Accepted 27 February 20 09 PACS: 42.25Fx Keywords: Light scattering Separation of variables' method Nonspherical inhomogeneous scatterers abstract A separation of variables method based on expansions of the electromagnetic fields in terms of spherical wave functions is expanded at nonspherical (axisymmetric) particles with a rather large number of layers ... Light scattering by nonspherical particles. ...
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Ссылки http://www.astro.spbu.ru/DOP/8-GLIB/op3/JQSRT_110_1356.pdf -- 792.4 Кб -- 19.11.2010
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853. Database of Optical Properties -- Level: subpage
Here we compare the optical properties of porous nonspherical particles of two kinds: . ... For each considered value of porosity P, we give first 8 figures on 1 page that show the dependence of the dimesionless extinction (Q ext ) and linear polarization (Q pol ) cross-sections particles on their difraction parameter x v = 2 pi r v / lambda, where r v is the radius of a sphere which volume is equal to that of a nonspherical particle, lambda is the wavelength of incident radiation. ...
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854. Database of interstellar extinction and polarization curves
DATABASE OF INTERSTELLAR EXTINCTION AND POLARIZATION CURVES . This database contains information about the interstellar extinction and polarization curves observed in a wide spectral range from ultraviolet to infrared for stars located in different regions of the Galaxy and Magellanic Clouds. ... dir . ... 0.55 . ... B3 III . ... dir The work was supported by the RFBR grant 07-02-00831. ...
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855. Database of Optical Properties -- Level: subpage
The following figures show the behaviour of the efficiency factors Q ext , Q sca , Q abs as well as albedo and asymmetry parameter g for porous particles. ... These optical characteristics are compared with results of Lorenz-Mie calculations for corresponding n -layered spheres. ... factors . Qext(x) . Qsca(x) . ... Qabs (x) . ... albedo (x) . ... Henning, Modelling the optical properties of composite and porous interstellar grains, Astronomy and Astrophysics , 429 , 371-381, 2005. ...
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856. http://www.astro.spbu.ru/DOP/8-GLIB/op2/els11a.pdf
Eleventh Conference on Electromagnetic & Light Scattering Scattering of light by fluffy aggregates consisting of small and large particles N. N. Zavyalov and N. V. Voshchinnikov Sobolev Astronomical Institute, St. Petersburg University, Universitetskii prosp., ... For particles with inclusions of different sizes the satisfactory agreement between n-layered spheres and DDA computations is obtained for small and intermediate porosity. ... If P = 0 the particle is homogeneous and compact. ...
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Ссылки http://www.astro.spbu.ru/DOP/8-GLIB/op2/els11a.pdf -- 361.3 Кб -- 19.11.2010
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857. http://www.astro.spbu.ru/DOP/8-GLIB/op2/aa429_371.pdf
A&A 429, 371381 (2005) DOI: 10.1051/0004-6361:200400081 c ESO 2004 Astronomy & Astrophysics Modelling the optical properties of composite and porous interstellar grains N. V. Voshchinnikov1,2 , V. B. Il'in1,2 , and Th. ... The optical properties of particles with inclusions depend on the size of inclusions provided the porosity is large. The scattering characteristics of very porous particles with inclusions of different sizes are found to be close to those of multi-layered spheres. ... Fig. ...
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Ссылки http://www.astro.spbu.ru/DOP/8-GLIB/op2/aa429_371.pdf -- 918.2 Кб -- 19.11.2010
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858. Database of Optical Properties -- Level: subpage
... He considers some practical aspects of dependences of the optical properties of cosmic dust analogs on their parameters. ... First results of a systemtic study as well as a detailed comparison of different optical characteristics (cross-sections, phase function, etc.) of some complex shape and structure scatterers and their optical models are presented here and here . ...
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859. Database of Optical Properties -- Level: subsubpage
Cross-sections, albedo, asymmetry factor for homogeneous spheres . ... The dependence on the size parameter x for different refractive indices m=n+k i . ... Q abs (x) . albedo (x) . ... Parameters: n = 1.3; k = 0, 0.01, 0.03, 0.1, 0.3; x = 0--20. ... Notes: Q abs =0, albedo=1, when k=0. ... The dependence on the size parameter rho for different refractive indices m=n+k i . Q ext (rho) . ... Q abs (rho) . albedo (rho) . g (rho) . ... Parameters: n = 1.3, 1.5, 1.7; k = 0; rho = 0--12. ...
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Ссылки http://www.astro.spbu.ru/DOP/8-GLIB/BASICS/S/s.html -- 7.4 Кб -- 19.11.2010
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860. Database of Optical Properties -- Level: subsubpage
Cross-sections and albedo for homogeneous infinitely long cylinders . ... The dependence on the size parameter x for different refractive indices m=n+k i . ... Q abs (x) . albedo (x) . ... Parameters: n = 1.3; k = 0, 0.01, 0.03, 0.1, 0.3; x = 0--20. ... Notes: Q abs =0, albedo=1, when k=0. ...
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Ссылки http://www.astro.spbu.ru/DOP/8-GLIB/BASICS/C/c.html -- 5.4 Кб -- 19.11.2010
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