Pub Date : 2002-01-01DOI: 10.1080/0898150021000030111
K. Kobylańska-Szkaradek
This work describes the influence of laser treatment on the structure and some properties of Al 2 O 3 , Al 2 O 3 + 5%Ni, Al 2 O 3 (95%Ni + 5%Al), Al 2 O 3 + 5%Ni - (95%Ni + 5%Al) and Al 2 O 3 + 5%Ni + CrAl layer oxide ceramic coatings of about 100 m thickness deposited by air plasma spraying on a heat-resistant alloy with a nickel matrix. It has been stated that laser remelting of power density 0.01-0.2 10 9 W m 2 and scanning rate within 5-7 m min 1 ensures good quality of ceramic coatings in comparison with not-remelted coatings. Laser treated ceramic coatings have a better thermal conductivity than as deposited layers. As shown by model calculations, after laser treatment, they show a smaller temperature drop over a given thickness. The erosion resistance of the coatings, however, is greater after laser treatment.
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Pub Date : 1900-01-01DOI: 10.1080/08981500290022770
J. Marciak-kozlowska, M. Kozłowski
Recently the measurement of X-ray pulses approaching the attosecond frontier was published (M. Drescher et al ., Science 291 (2001) p. 1923). The attosecond laser pulse enables the study and control of the motion of electrons inside atoms. In this paper we develop and solve the modified Schrodinger equation (MSE) which describes the interaction of electrons with its surroundings in an atom. This interaction can be detected only using an attosecond laser pulse within the relaxation time of the interaction which is of the order of 10 attoseconds.
最近发表了接近阿秒边界的x射线脉冲测量(M. Drescher et al .， Science 291 (2001) p. 1923)。阿秒激光脉冲使研究和控制原子内电子的运动成为可能。本文建立并求解了描述原子中电子与周围环境相互作用的修正薛定谔方程(MSE)。这种相互作用只能在10阿秒量级的相互作用弛豫时间内使用阿秒激光脉冲来检测。
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