Effective conductivities of composite materials composed of cubic arrangements of spherical particles embedded in an isotropic matrix

Results are presented for the effective conductivities of simple, face-centered, and body-centered cubic arrays of isotropic spherical particles embedded in an isotropic medium possessing a different conductivity. With the use of a multipole expansion technique, numerical and conceptual errors in the prior work of others are corrected. Agreement with existing experimental data is found to be excellent.

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Zusammenfassung Für die Leitfähigkeit einer einfachen körper-zentrierten kubischen Anordnung von isotropen kugelfömigen Teilchen, die in einem isotropen Medium mit einer verschiedenen Lefähigkeit eingebettet sind, werden Resultate angegeben. Mit Hilfe einer Multipole-Entwicklung werden gewisse numerische und konzeptuelle Fehler früherer Arbeiten korrigiert. Sehr gute Uebereinstimmung mit den vorhandenen experimentellen Resultaten wurde festgestellt.

     

Direct measurement of the quantum yield for the creation of mobile excitons from localized states using optically detected electron spin coherence

Optically detected spin locking and adiabatic demagnetization in the rotating frame are used to directly measure the rate constants for trap-to-band promotion and trap-to-trap energy migration in 1,2,4,5-tetrachlorobenzene. Comparison of these rate constants at a given temperature gives the quantum yield for the decay of a promoted localized state into a mobile exciton state. Its dependence on temperature is also determined.     

Digital optical computing

The motivation for a digital optical computer is based on the shortcomings inherent in of electronic computers. Optics has solutions to offer especially in interconnects. Devices based on nonlinear optical effects are still in the early stages of their development. Hence at an intermediate stage hybrid opto-electronic computers might emerge. Their architectures should make use of the special attributes of optics. A specific approach called symbolic substitution logic is outlined.     

On the crack formation of laser treated carbon steel

High power lasers are useful instrument in producing hard and wear resistant surfaces on steel. It is shown that the mechanical behaviour of such surfaces is controlled by their residual stress state and their ductility which both can be varied considerably by changing the laser treatment parameters.     

Bestimmung von Corticosteroiden im Blut durch Doppelmarkierung und Messung von 14C und 3H in der Gasphase

Ohne ZusammenfassungAuszug aus der Dissertation Reinhard Ködding, Technische Hochschule München 1961.