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30 results on '"Kaplan, Alexander"'

4. Influence of Meditation on Brain Mechanisms: Methodological Aspects

Author

Medvedev, Svyatoslav, primary, Boytsova, Julia, additional, Bubeev, Yuri, additional, Kaplan, Alexander, additional, Kokurina, Elena, additional, Smoleevskiy, Alexander, additional, Syrov, Nikolay, additional, Yakovlev, Lev, additional, Zhironkina, Julia, additional, Rinpoche, Telo Tulku, additional, Chhonden, Tanzin, additional, Dorje, Yeshi, additional, Lhakpa, Stanzin, additional, Lobsang, Tenzin, additional, Lhundup, Kunga, additional, Norbu, Ngawang, additional, Phuntsok, Lobsang, additional, Sangpo, Lodoe, additional, Sherap, Thupten, additional, and Wangchuk, Tenzin, additional

Published
2021
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29. Keyhole Welding: The Solid and Liquid Phases.

Author

Kaplan, Alexander

Abstract

Deep penetration laser welding relies on the evaporation of material by a high power laser beam in order to drill a vapour capillary, usually referred to as a keyhole. During continuous welding the keyhole is kept open by the pressure in the vapour which evaporates continuously from its wall; the pressure acts continuously against the surface tension pressure that favours contraction. In contrast to pulsed wave (pw-) laser welding, during continuous wave (cw-) laser welding quasi-steady state conditions of the accompanying temperature field, and thus of the shape of the keyhole and melt pool, are established. Nevertheless, in the keyhole and melt pool complex fluid mechanical mechanisms take place. The most important thermodynamic and melt flow phenomena in keyhole laser welding will be briefly discussed. For some of them mathematical models and calculation results will be presented, complementing a comprehensive survey that was published earlier [1]. Notation employed in this chapter is given in Table 3.1. [ABSTRACT FROM AUTHOR]

Published
2009
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30. Metallurgy of Welding and Hardening.

Author

Kaplan, Alexander

Abstract

For laser welding and for laser hardening the resulting mechanical properties of the product can be expressed by the shape and metallurgy of the processed cross section. Both are determined by heat conduction, in particular by resolidification, by diffusion and by the crystallographic material behaviour, governed by the local thermal cycle of the material. In the following, a brief survey on the physical mechanisms responsible for the metallurgy [1, 2] at the macro- and micro-scale will be given, mainly referring to ferritic low alloy steel as the most relevant material. Many aspects are relevant to both welding and hardening, while some aspects are process-specific. For certain phenomena selected mathematical models are presented that enable quantitative calculation and description of the phenomena. The notation employed in this chapter is to be found in Table 7.1. [ABSTRACT FROM AUTHOR]

Published
2009
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