Anvendung und Perspektiven der Strahlungsvernetzung in der Volkswirtschaft der DDR

Zum angegebenen Thema wurde vom Zentralinstitut für Festkörperphysik und Werkstofforschung der Akademie der Wissenschaften der DDR (ZfFW) gemeinsam mit dem Bezirksvorstand Dresden der Kammer der Technik am 9. 10. 1975 ein Tageskolloquium veranstaltet. Es wurden 100 Teil-nehmer registriert, wobci Kombinate und Betriebe zur Anwendung von Plasten und Elasten stark vertreten waren.     

Zur Existenz der Zweierlei Strukturen der Stehenden Schichten in der Niederdruckentladung in Neon

Zusammenfassung Auf Grund der vorgenommenen Messungen läßt sich behaupten, daß die Strahlung beider Schichttypen dem Neon angehört und keineswegs irgendeiner Beimischung eines fremden Gases, das sich im Neon vorfinden könnte. Damit ist jedoch der Einfluß geringer Beimengungen nicht ausgeschlossen, welche unter gewissen Bedingungen trotz der stufenweisen Ionisierung, metastabiler Zustände u. ä. eine wesentliche Rolle bei der Ausgestaltung der Elementarprozesse spielen können und die bei unserer Messung nicht festgestellt wurden.

---

Optical spectral analysis is used to investigate the double structure of standing striations in the positive column of a d-c glow discharge in Ne. The course of the relative intensity of the different spectral lines along the axis of the discharge tube is given. It follows from the measurements that the radiation of both types of striations in a double structure corresponds to neon and not to the admixture of a strange gas. The possible influence of this admixture on the formation of a double structure is not, however, excluded.

     

Interferometrische Bestimmung der Gastemperatur in der Stickstoffniederdruckentladung

A Michelson-interferometer in combination with a He-Ne-laser was used to determine the gas temperature in a nitrogen low pressure gas discharge. With this method the radial temperature profile could be measured to about 96% of the tube radius. Moreover rotational temperatures were measured with a 2 m-grating spectrograph from the spectrum of N₂- and N₂⁺-bands. In the range from 4 to 10 torr and 25 to 100 mA gas temperatures between 460 and 890 K were measured with the belonging rotational temperature from 620 to 1170 K. At pressures below 10 torr a difference of the rotational temperatures from the first negative and the second positive system was found. A qualitative consideration on the mechanism of the radial heat conductivity in the positive column was added.     

Zur Definition der Drehimpulseigenfunktionen in der Vektormesontheorie

There are three possibilities for the introduction of angular momentum eigenfunctions in the vector-meson-theory: 1. Multipole fields, 2. orbital angular momentum eigenfunctions, 3. helicity eigenfunctions. We shall define these functions by eigenvalue equations and present their mutual relationship. In analogy to the usual momentum quantization we may quantize the field with respect to each of the three systems of angular momentum eigenfunctions.     

Greensche Funktionen in der Theorie der Kernmaterie

The aim of this article is the representation of the theory of nuclear matter with the technique of many-body Green functions. We have treated the theory of Green functions thoroughly in the first chapters taking support of the functional method, which offers a convenient approach to the construction of the theory. After treatment of the properties of the exact two-point function and of the effective single-particle potential, preconditions and properties of the approximate solutions are discussed. Results achieved todate are treated in chapter 6. Brueckner theory and allied methods are not further discussed, since these are sufficiently known. The theory of linear response, being important for the semi-phenomenological treatment of real atomic nuclei, is presented in appendix A.     

Formfaktoren in der klassischen Dynamik der Teilchen

The classical dynamics of extended particles is considered. The restrictions imposed on the form factors by the Lorentz and gauge invariance as well by causality are shown.     

Mikrowellenabsorption in der Nähe der 2. Harmonischen der Elektronenzyklotronfrequenz

In plasmas produced by microwave power the electron density displays a dependence on the magnetic field strength obviously asymmetric with respect to the harmonics of the electron cyclotron frequency. In regions of the magnetic field strength just above the harmonics there are extremely high values of electron density, the density values dropping sharply off towards the other wing of the harmonics. Absorption experiments near the second harmonic at low microwave power — the plasma being produced by different means — reveal a resonant absorption structure in the magnetic field region above the harmonic. This can be attributed to excitation of geometrical eigenmodes of electrostatic. waves propagating perpendicular to the magnetic field (Bernstein waves).     

Die Clausius-Mosottische Formel in der Theorie der Dielastika

Point defects in crystal lattices are specified with respect to their mechanical properties by the elastic polarisabilityα (dia-elastic case) or by the permanent elastic dipole momentp (para-elastic case) or by both together. These fundamental quantities can be obtained in macroscopic measurements of elastic moduli by applying formulae of the Clausius-Mosotti type and of the polar gas type resp. The present work gives the corresponding theory.