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On frattini extensions of the projective special linear group

Autor: S. D. Kozlov

Publikováno v: Siberian Mathematical Journal. 32:252-256

UDC 512.54 Let G ~ be the image of a finite group G under a homeomorphism ~ with the kernel ker ~ = ~ lying in the Frattini subgroup O(G) of the group G. In this case we shall call G a Frattini extension of the group G ~. Obviously a Frattini extensi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a82aa279c4b9990fa1d9e70f6f0d988c
https://doi.org/10.1007/bf00972771

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Objectives with continuously variable focal length for operation in the infrared

Autor: V. P. Ivanov, A. E. Morozov, N. G. Nigmatullina, S. D. Kozlov

Publikováno v: Journal of Optical Technology. 74:56

This paper discusses the features of the design and calculation of zoom lenses that operate in the spectral regions 3-5 and 8-12 µm. The optical layouts and the calculated characteristics of the lenses are presented.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c95ef442b240611b341a0d5c0b0a54a7
https://doi.org/10.1364/jot.74.000056

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