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The investigation of atomic resonance fluorescence has always been of special interest as a means for the determination of atomic parameters. In addition, information on the interaction mechanism between atoms and radiation can be obtained. In the standard fluorescence experiment the frequency distribution of the incident photons is larger than the natural width of the respective transition; as a consequence the correlation time in the photon-atom interaction is determined by the lifetime of the atoms in the excited state. With the development of lasers and especially of tunable dye lasers in recent years it became possible to study the case where the incident radiation has a spectral distribution which is narrower than the natural width. This corresponds to a correlation time of the incoming light wave which is much longer than the excited-state lifetime. In this chapter a survey of experiments on the resonance fluorescence of atoms in monochromatic laser fields will be given.
Analog anzeigende Digitaluhr
(1983)
Nichtrostende Stähle
(1987)
Today the most accurate and cost effective industrial codes used in aircraft design are based on the full potential equation coupled with boundary layer equations. However, these are not capable to solve complicated three-dimensional problems of vortical flows and shocks. On the other hand Euler and Navier-Stokes codes are too expensive and not accurate enough for design purposes, especially in regard of drag and interference prediction. The reasons for these deficiencies are investigated and a way to overcome them by future developments is demonstrated.
Schnappverbindungen
(1991)
Für die Erstellung von Maschinenbelegungsplanen wurden im Operations Research aufwendige Optimierungsverfahren konzipiert und entsprechende Programme entwickelt. Maschinenbelegungsprobleme sind klassische Vertreter der Klasse der np-vollständigen Probleme, also sichere Kandidaten für kombinatorische Explosion der Lösungsalternativen. Deshalb ist der Einsatz konventioneller Planungssysteme wegen der hohen Rechneranforderungen der gängigen Verfahren an die Hardware oft nicht praktikabel.
Regenerative Energiequellen
(1994)
BIG KARL and COSY
(1995)