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941. Anomalous diffraction approximation (AD)
Using the Huygens and Babinet principles van de Hulst [ 11 ] considered the problem of light scattering and extinction by a particle having the size and the refractive index . ... The absorption cross-section is . ... The range of applicability of the anomalous diffraction theory for the scattering amplitude is limited by small angles, however the formules for the cross-sections became good approximations for a wide class of particles. ... This problem for spherical particles was solved by A.Ya. ...
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/KHLEB1/node15.html -- 10.2 Кб -- 19.11.2010
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942. Perturbation method
The perturbation method is based on the small-parameter expansion of an unknown solution of the light scattering problem in a vicinity of the exact solution. ... The only probably exclusion is the case of anisotropic particles for which the rigid solution is either impossible or too complicated. For such problems the perturbation method can give information of the first approximation, which is important for understanding of the basic principles of influences of the material anisotropy. ...
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/KHLEB1/node18.html -- 4.7 Кб -- 19.11.2010
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943. Hybrid and simple analytical approximations
Latimer [ 322 , 323 ] suggested the approximations based on a combination of the RDG and AD theories for spheroids and the Mie theory to describe scattering and extinction of light by non-spherical particles. The idea of these approximations is as follows: on the base of the RDG and AD theories to find an analogy between the formulas for the scattering characteristics for a sphere and an oriented spheroid. ...
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/KHLEB1/node19.html -- 4.4 Кб -- 19.11.2010
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944. Exact methods
. Separation of variables method . Spherical particles . Cylinders . Spheroids . Point matching method . Integral equation method . Coupled dipoles method (Purcell-Pennypacker, CDM) . T-matrix method (EBCM) To the top . Created by V.I. Last modified: 12/08/03, V.I.
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/KHLEB1/node2.html -- 3.2 Кб -- 19.11.2010
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945. Database of Optical Properties -- Level: subsubsubpage
... There are several classifications of the exact methods. ... A more physical classification is that of Th.Wriedt (1998) where he devides the methods in 3 groups: Mie theory expansions (SVM), surface-based (PMM, EBCM, GMT, MoM) and volume-based (FDTDM, TLMM, FEM and various volume IEMs - CDM, DDA, etc.) methods. Features of the methods . Among the methods only SVM and EBCM are capable to provide very accurate results (5 and more correct decimals) (Mishchenko et al., 2000). ... 1998) Part. ...
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/survey2.html -- 7.2 Кб -- 19.11.2010
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946. http://www.astro.spbu.ru/DOP/3-REVS/khleb1e.ps
Methods for calculating light scattering by single particles N.G. Khlebtsov Part I. Exact methods The general formulation of the problem of light scattering (diffraction) is rather simple. The field ~ E 0 is incident on a scatterer of the volume V , and creates the field ~ E i inside the scatterer and an additional (diffraction) field ~ E s outside it. Thus, from Maxwell's equations one should find the total field ~ E equal to ~ E i inside V and to ~ E 0 + ~ E s outside V and satisfying the boundary
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/khleb1e.ps -- 292.9 Кб -- 19.11.2010
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947. Database of Optical Properties -- Level: subpage
Our survey of the exact methods of light scattering theory compares some properties of various methods and briefly discusses their similarities and differences. We give some basic references, including those to available codes realizing the methods and to other recent reviews. ... The review considers only a few methods but does it very good and completely enough (there are given over 500 references). ... At the moment the review is in Russian, but its English translation is in progress. ...
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/index.html -- 3.0 Кб -- 19.11.2010
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948. Database of Optical Properties -- Level: subsubpage
. The page is under construction. Our table shows a classification of various light scattering methods, applicability to different scatterers and to their ensembles as well as the anzatz sources and recent reviews. In comments we briefly discuss different classifications, features, relationships, available codes, comparison works and recent reviews of the light scattering methods. To the top . Created by V.I. Last modified: 10/04/03, V.I.
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/survey.html -- 2.3 Кб -- 19.11.2010
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949. Database of Optical Properties -- Level: subsubpage
The efficiency of interaction of radiation with a particle and hence its optical properties depend on the particle chemical composition, size, shape, structure, etc. ... Particle size expressed in units of the wavelength of incident radiation, together with chemical composition, most strongly affects the optical properties of a scatterer. ... There are many methods to solve the light-scattering problem for a homogeneous spheroid (our survey of the light-scattering methods see here ). ...
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Ссылки http://www.astro.spbu.ru/DOP/2-MODS/INTROD/index.html -- 9.5 Кб -- 19.11.2010
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950. Database of Optical Properties -- Level: subpage
. Our introductory notes briefly describes the primary parameters of real scatterers, their basic models and methods of realization of the models. As an example, the models used in astronomy are overviewed. Our table after its completement will show a list of the most popular scatterer models and their parameters (under construction). To the top . Created by V.I. Last modified: 06/03/03, V.I.
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Ссылки http://www.astro.spbu.ru/DOP/2-MODS/index.html -- 2.2 Кб -- 19.11.2010
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951. Database of Optical Properties -- Level: subpage
... very large . no limits in x,m . ... x, m, alpha . ... no limits in x,m,alpha . As a first approximation when one wants to learn possible effects of nonsphericity of scatterers. seldom . ... very large / large . ... Study of shape effects since spheroids with different semiaxis ratio present a set of 2D shapes from needles to disks (incl. spheres) . ... Study of complex shape effects. seldom . ... Possible study of 3D shape effects. ... Possible study of shape and structure effects. ...
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Ссылки http://www.astro.spbu.ru/DOP/2-MODS/table.html -- 8.8 Кб -- 19.11.2010
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952. Database of Optical Properties -- Level: subsubsubpage
... Approach / method . ... SVM - Separation of Variables Method . ... yes(?) . ... Mi00 , Ka03 , * . ... Ka03 . FEM - Finite Element Method . ... FDM - Finite Difference Method . ... FDTDM - Finite Difference in Time Domain Method . ... PMM - Point Matching Method . ... Ci00 - Ciric I.R., Cooray F.R. (2000) in M.I.Mishchenko et al. (eds) Light Scattering by Nonspherical Particles. ... Mi00 - Mishchenko M.I. et al. (2000) in Mishchenko et al. (eds) Light Scattering by Nonspherical Particles. ...
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Ссылки http://www.astro.spbu.ru/DOP/3-REVS/survey1.html -- 9.1 Кб -- 19.11.2010
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953. http://www.astro.spbu.ru/DOP/1-DEFS/intro3e.ps
On optical characteristics of nonґspherical scatterers Abstract. ... For example, the extinction crossґsection C ext shows what fraction of the incident flux is absorbed and scattered by a particle. ... Therefore, in contrast to the spheres, for nonґspherical particles the crossґsection of radiation pressure is a vector too ~ C pr = C ext ~ R R \Gamma C sca ~g; (19) where R is the distance between the scatterer and the radiation source. ...
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Ссылки http://www.astro.spbu.ru/DOP/1-DEFS/intro3e.ps -- 88.2 Кб -- 19.11.2010
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954. Database of Optical Properties -- Level: subpage
Our introductory notes presented by V.G.Farafonov give the definitions of such basic optical characteristics of non-spherical scatterers as amplitude and scattering matrices, different cross-sections, asymmetry factor, etc. Special attention is paid to the differences between these definitions and those for spherical scatterers. ... 2000). The PostScript version of the notes is here . ... Created by V.I. Last modified: 10/05/03, V.I. ...
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Ссылки http://www.astro.spbu.ru/DOP/1-DEFS/index.html -- 2.3 Кб -- 19.11.2010
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955. intro3e
On optical characteristics of non-spherical scatterers . ... Usually one assumes that the radiation from a very distant source is incident on a scatterer and then this radiation can be represented by a plane wave . ... Amplitude matrix . ... The elements of the amplitude matrix on the directions of propagation of the incident and scattered radiations, the size, morphology and chemical composition of the scatterer as well as its orientation in the laboratory system. ... Scattering matrix . ...
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Ссылки http://www.astro.spbu.ru/DOP/1-DEFS/INTROD/index.html -- 33.6 Кб -- 19.11.2010
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956. Database of Optical Properties -- Level: subpage
... The database on experiments of light (441.6 and 632.8 nm) scattering by small mineral particles performed in the laboratory of Univ. of Amsterdam contains figures and tables of scattering matrix elements as functions of the scattering angle (theta = 5-173) at both wavelengths, figures and tables of the size distributions measured with the laser diffraction method, electron microscope images of the particles, information ...
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Ссылки http://www.astro.spbu.ru/DOP/0-LABR/index.html -- 2.9 Кб -- 19.11.2010
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957. http://cadcwww
... http://cadcwww.dao.nrc.ca/meetings/ . ... http://www.sao.ru САО РАН . ... http://archive.stsci.edu . ... http://archive.stsci.edu/dss DSS . ... http://www.mso.anu.edu.au/2dFGRS/ 2dF . ... http://www.stsci.edu/ftp/science/hdf/hdf.html HDF-N + S . http://www.astro.sunysb.edu/fsoto/hdf/hdf_fs.html . http://www.stsci.edu/hst/udf HUDF . http://adcam.pha.jhu.edu/~coe/UDF/segm/ . http://www.aip.de/groups/galaxies/sw/udf/index.php# . ... http://simbad.u-strasbg.fr/simbad/ SIMBAD . ...
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Ссылки http://www.astro.spbu.ru/staff/resh/databases.html -- 7.1 Кб -- 28.10.2010
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958. Teaching
.
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Ссылки http://www.astro.spbu.ru/staff/resh/teaching.html -- 2.6 Кб -- 09.03.2010
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959. http://www.astro.spbu.ru/sites/default/files/sqs.pdf
К К ?? ? ?? ? ? ? ? ? ? Й ОММ Й К К ?? ? ?? ? ? ? ? ? ? Й ОММ ПМКН ДМ К Е ООКПН Н Й КЙ К К Д К Й КЙ К Д КЙ КЙ И К К К К ? ЕИ К К К ?К К ? Е КЙ Н КК К Й ПМ К К И ОММ К К Й СЫ Ц ЙО ЙМО ? И К Й К Й К К К КК К ОМ Й Й Й К Й Й HЙ К КП К? К К ОММО КИ Ц Й КК КЙ ООКПН И ОММ СЫ Ц ЙО ЙМО Й И ОММ КККККККККККККККККККККККККККККККККККККККККККККККККККК НН НК СК ? я НК ДН ЕК ПК ДН ЕК ККККККККККККККККККККККККККККККККККККККККК КККККККККККККККККККККККККККККККККККККККККККК ДНПЕК ОК Й Й И КККККККККККККК ДН ЕК ДН ЕК ОК
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Ссылки http://www.astro.spbu.ru/sites/default/files/sqs.pdf -- 1681.3 Кб -- 22.02.2010
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960. http://www.astro.spbu.ru/staff/resh/GA/GenAstronomy.pdf
... И И И И И И Й К И К Й Й О ОКН К ОКО ? ... К Й К К Н ОКП ? ... И И? К НК иид ЛЛлллК зижгКзд йКжй Н НКН К И Д ЕИ И И Й Й КН НКО AB C cos a = cos b cos c + sin b sin c cos A cos b = cos c cos a + sin c sin a cos B cos c = cos a cos b + sin a sin b cos C НКП sin A sin a = sin B sin b = sin C sin c О НК sin b cos A = cos a sin c - sin a cos c cos B ... ЕИ О ОКН К ОКО К ОКП ? И П? ПКН ? И И К И К - К - ПКО ? ...
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Ссылки http://www.astro.spbu.ru/staff/resh/GA/GenAstronomy.pdf -- 1411.7 Кб -- 13.02.2010
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