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Sinossi
Light scattering and absorption by small homogeneous particles can be worked-out exactly for spheres and infinite cylinders. Homogeneous particles of irregular shapes, when averaged with respect to rotation, have effects that can in general be well-approximated by reference to results for these two idealised cases. Likewise, small inhomogeneous particles have effects similar to homogeneous particles of the same average refractive index. Thus most problems can be solved to a satisfactory approximation by reference to the exact solutions for spheres and cylinders, which are fully stated here in the early part of the book. The sum of scattering and absorption, the extinction, is too large to be explained by inorganic materials, provided element abundances in the interstellar medium are not appreciably greater than solar, H 0 and NH3 being essentially excluded in the 2 general medium, otherwise very strong absorptions near 3p,m would be observed which they are not. A well-marked extinction maximum in the ultraviolet near 2200A has also not been explained satisfactorily by inorganic materials. Accurately formed graphite spheres with radii close to O.02p,m could conceivably provide an explanation of this ultraviolet feature but no convincing laboratory preparation of such spheres has ever been achieved.
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Contenuti
1. Introduction. 2. Electromagnetic Properties of Small Particles. 3. Interstellar Extinction and Polarisation. 4. Reflection Nebulae and the Diffuse Galactic Light. 5. Interactions between Dust, Gas and Radiation. 6. Inorganic Theories of Grain Formation. 7. The Organic Grain Model. 8. Models of the Extinction and Polarisation of Starlight. 9. Spectroscopic Identifications. 10. Dust in External Galaxies. Index.
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Book by Wickramasinghe NC Hoyle B
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The Theory of Cosmic Grains (Astrophysics and Space Science Library, 168)
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Gebunden. Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Light scattering and absorption by small homogeneous particles can be worked-out exactly for spheres and infinite cylinders. Homogeneous particles of irregular shapes, when averaged with respect to rotation, have effects that can in general be well-approxim. Codice articolo 5966231
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The Theory Of Cosmic Grains
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Condizione: New. Develops a theory of Cosmic Grains starting logically from basic mathematical and astronomical premises. This book guides the reader through a historical progression of ideas on the nature of grains, leading to the author's own point of view, which shows the role of complex organic material in the interstellar grains. Series: Astrophysics and Space Science Library. Num Pages: 316 pages, biography. BIC Classification: PGM. Category: (P) Professional & Vocational; (UP) Postgraduate, Research & Scholarly. Dimension: 235 x 155 x 19. Weight in Grams: 631. . 1991. Hardback. . . . . Codice articolo V9780792311898
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The Theory of Cosmic Grains
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Springer Netherlands, Springer Netherlands Okt 1991, 1991
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Buch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Light scattering and absorption by small homogeneous particles can be worked-out exactly for spheres and infinite cylinders. Homogeneous particles of irregular shapes, when averaged with respect to rotation, have effects that can in general be well-approximated by reference to results for these two idealised cases. Likewise, small inhomogeneous particles have effects similar to homogeneous particles of the same average refractive index. Thus most problems can be solved to a satisfactory approximation by reference to the exact solutions for spheres and cylinders, which are fully stated here in the early part of the book. The sum of scattering and absorption, the extinction, is too large to be explained by inorganic materials, provided element abundances in the interstellar medium are not appreciably greater than solar, H 0 and NH3 being essentially excluded in the 2 general medium, otherwise very strong absorptions near 3p,m would be observed which they are not. A well-marked extinction maximum in the ultraviolet near 2200A has also not been explained satisfactorily by inorganic materials. Accurately formed graphite spheres with radii close to O.02p,m could conceivably provide an explanation of this ultraviolet feature but no convincing laboratory preparation of such spheres has ever been achieved.Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 322 pp. Englisch. Codice articolo 9780792311898
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Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Light scattering and absorption by small homogeneous particles can be worked-out exactly for spheres and infinite cylinders. Homogeneous particles of irregular shapes, when averaged with respect to rotation, have effects that can in general be well-approximated by reference to results for these two idealised cases. Likewise, small inhomogeneous particles have effects similar to homogeneous particles of the same average refractive index. Thus most problems can be solved to a satisfactory approximation by reference to the exact solutions for spheres and cylinders, which are fully stated here in the early part of the book. The sum of scattering and absorption, the extinction, is too large to be explained by inorganic materials, provided element abundances in the interstellar medium are not appreciably greater than solar, H 0 and NH3 being essentially excluded in the 2 general medium, otherwise very strong absorptions near 3p,m would be observed which they are not. A well-marked extinction maximum in the ultraviolet near 2200A has also not been explained satisfactorily by inorganic materials. Accurately formed graphite spheres with radii close to O.02p,m could conceivably provide an explanation of this ultraviolet feature but no convincing laboratory preparation of such spheres has ever been achieved. 322 pp. Englisch. Codice articolo 9780792311898
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Buch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Light scattering and absorption by small homogeneous particles can be worked-out exactly for spheres and infinite cylinders. Homogeneous particles of irregular shapes, when averaged with respect to rotation, have effects that can in general be well-approximated by reference to results for these two idealised cases. Likewise, small inhomogeneous particles have effects similar to homogeneous particles of the same average refractive index. Thus most problems can be solved to a satisfactory approximation by reference to the exact solutions for spheres and cylinders, which are fully stated here in the early part of the book. The sum of scattering and absorption, the extinction, is too large to be explained by inorganic materials, provided element abundances in the interstellar medium are not appreciably greater than solar, H 0 and NH3 being essentially excluded in the 2 general medium, otherwise very strong absorptions near 3p,m would be observed which they are not. A well-marked extinction maximum in the ultraviolet near 2200A has also not been explained satisfactorily by inorganic materials. Accurately formed graphite spheres with radii close to O.02p,m could conceivably provide an explanation of this ultraviolet feature but no convincing laboratory preparation of such spheres has ever been achieved. Codice articolo 9780792311898
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Condizione: New. Develops a theory of Cosmic Grains starting logically from basic mathematical and astronomical premises. This book guides the reader through a historical progression of ideas on the nature of grains, leading to the author's own point of view, which shows the role of complex organic material in the interstellar grains. Series: Astrophysics and Space Science Library. Num Pages: 316 pages, biography. BIC Classification: PGM. Category: (P) Professional & Vocational; (UP) Postgraduate, Research & Scholarly. Dimension: 235 x 155 x 19. Weight in Grams: 631. . 1991. Hardback. . . . . Books ship from the US and Ireland. Codice articolo V9780792311898
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