By Christian Kern
Die Radio-Frequenz-Identifikation (RFID) erm?glicht den drahtlosen Informationsaustausch zwischen Objekten, Personen, Tieren und dem IT-Netzwerk. Objekte, Personen oder Tiere werden dabei selbst zu Datentr?gern. Leser werden hier in die Lage versetzt, eine RFID-Anwendung von der Idee bis zur Praxis aufzubauen. Wie aktuell das Thema und entsprechend gro? die Nachfrage ist, zeigt das Erscheinen der 2. Auflage nach nur einem Jahr.
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The x-direction is rotated through 900 with respect to the other. However we can see that this gives approximate alignment of the Al in the sapphire to the Ga in the GaN. The mismatch is so large however that the GaN is very heavily relaxed towards its unstrained state and will be full of defects associated with this poor match. Pashley (1956) has given a very full account of the possibilities in epitaxy and the accounts of the early theories. A full all-encompassing theory explaining the nucleation and orientation dependence is still elusive, but there are some general guidelines that can be given.
D 32 A145. 22 X-RAY SCATTERING FROM SEMICONDUCTORS Davis, T J, Gao, D, Gureyev, T E, Stevenson, A W and Wilkins, S W (1995) Nature 373 595. Stranski, J N and Krastanow, L (1938) Ber. Akad. Wiss. Wien 146 797. Whatmore, R W, Goddard, P A, Tanner, B K and Clark, G F (1982) Nature 299 44. 1. The interaction of X-ray photons with the sample The X-ray photon interacts with the sample in many different ways and the form of interaction depends on the photon energy and the nature of the sample. X-ray photons are electromagnetic and it is the electric field vector that interacts most strongly with the sample.
1 The various ways in which X-rays interact with matter as a function of their energy. The tightly bound electrons will appear as a large immovable mass to a photon and therefore the energy transfer on interaction is very small (Rayleigh scattering), that is, the quantised energy state of the electrons is unchanged. If the wavelength of the photon is greater than that of the energy levels in the atoms of the sample then photoelectron absorption can occur Chapter 2 An Introduction to X-Ray Scattering 25 and this is particularly strong when the energy exactly matches one of these energy transitions.
Anwendung von RFID-Systemen, 2.Auflage German by Christian Kern