Ein neuer mikrochemischer Bleinachweis

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Asphalt

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Wismut

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Colorimetrische Wismutbestimmung II Die absolutcolorimetrische Wismutbestimmung mit Hilfe von Graul?sung

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An optical up-conversion light gate with picosecond resolution

Up-conversion (or optical mixing) of light was used to measure the duration of subnanosecond optical pulses.     

Buchbesprechungen

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Influence of the machine structure on micro milling process

To achieve accurate machining using the micro milling process, precise tools (diameter range 0.2 mm–2 mm) are used. Because of the special properties of the micro milling tools and the related machine structures, it is not enough to assign the classical technique in macro milling process, e.g. stability prediction respecting only the dynamics of the tool/workpiece, directly to analyze the micro milling process. It is proved to be required also to take characteristics of the entire machine structure into account. Therefore, the mechanical vibration research of the micro milling machine structure is necessary, and subsequently the modeling of the structure as a multiple body system is described. The identification of the natural frequencies of a micro milling machine structure by means of the classical modal analysis is shown, and the influence of the structure is verified by comparing the surface roughness of the manufactured workpiece in experimental testings. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)