Investigation of anomalousK,L andM shell conversion in electric dipole transitions

Anomalous experimental conversion coefficients of theK, L andM subshells are investigated for thirteen highly hindered electric dipole transition in six deformed odd mass nuclei. For a distinct nuclear transition, all experimental anomalies are consistent with one parameter, containing all nuclear information. The values of this parameter are determined and a simple connection with the hindrance of the transition seems to exist. TheK andL shell conversion coefficients have been recalculated, while theM shell conversion data were newly computed including all finite nuclear size effects as well as screening by a Thomas-Fermi-Dirac model.     

Über die Killing-Form in Jordan-Algebren

Ohne Zusammenfassung     

Thermodynamic properties of iron—selenium alloys

Selenium vapor pressures of iron-selenium alloys were determined by an isopiestic method between 700 and 1 200 K and 50 to 60 at%Se, and activities and partial molar enthalpies of selenium were calculated. ByGibbs-Duhem integration activities of iron, and integralGibbs energies were obtained. A theoretical model was successfully applied to interprete the thermodynamic properties of the hexagonal -phase with NiAs-structure. Assuming a random distribution of iron vacancies in every transition metal layer of the lattice excellent agreement with experimental data was found. The energy of interaction betwen iron vacancies was calculated to be 147.0 kJ/g-atom.

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Thermodynamische Eigenschaften von Eisen—Selen—Legierungen

Zusammenfassung Die Selendampfdrücke von Eisen-Selen-Legierungen wurden mit Hilfe einer isopiestischen Methode zwischen 700 und 1 200 K und zwischen 50 und 60 At%Se bestimmt. Daraus wurden die Aktivitäten und die partiellen molaren Enthalpien von Selen berechnet, und über eineGibbs-Duhem-Integration wurden die Eisen-Aktivitäten und die integralenGibbs'schen Energien erhalten. Ein theoretisches Modell wurde erfolgreich angewendet, um die thermodynamischen Eigenschaften in der hexagonalen NiAs-Phase zu interpretieren. Unter der Annahme einer statistischen Verteilung von Eisen-Leerstellen über sämtliche Übergangsmetall-Schichten wurde eine ausgezeichnete Übereinstimmung mit den experimentell gefundenen Daten festgestellt. Die Wechsel-wirkungsenergie zwischen diesen Leerstellen wurde zu 147,0 kJ/g-atom ermittelt.

     

Relaxationserscheinungen in Elektronenstrahlen

In electron beams with high charge density there are observed anomalous shiftings and broadenings as well as symmetrizations of the energy distribution (Boersch 1954). Continuing former work, where these phenomena were ascribed to a relaxation process changing the energy distribution to a new equilibrium distribution, quantitative expressions are derived for the energy spread and the shape of this new energy distribution. Furthermore a relaxation degree is defined which measures the progress of relaxation. Measurements are described with the highest relaxation degrees reached up to now. In addition to the verification of former results up to these new limits the shape of the measured energy-distributions can be fitted to the derived one with suitable choice of a single parameter. Peculiarities of measurements with superposed axial magnetic fields are discussed.     

Thermodynamic properties of liquid zinc-bismuth alloys

Thermodynamic properties of liquid Zn–Bi alloys were investigated between 5 and 95 at % Zn from the liquidus curve to 750°C using anemf method with a molten salt electrolyte. Partial and integral values were calculated and compared with results from the literature. From theemf data the liquidus curve was calculated. The thermodynamic data of the Zn–Bi system are well established and consistent with the phase diagram. The entropies of mixing of various group IIB-VA systems are compared and discussed with respect to compound formation in the liquid state.With 5 Figures     

Über Mengen von Randwerten meromorpher Funktionen

Ohne Zusammenfassung     

Glasumwandlung und sekundäre Umwandlungen in Polymeren

Colloid and Polymer Science - Es wird ein Sprung der Temperatur- und Wiärmeleitfähigkeit im Gebiet der Hauptglasumwandlung und sekundätren Umwandlungen bei Polymethylmethacrylat,...     

Low temperature thermal conductivity of OH− and OD−-doped LIF single crystals

Thermal conductivity measurements between 0.1 and 70K of OH^? and OD^? doped LiF indicates resonant phonon scattering at 0.86cm^? for OH^? and 0.43cm^? for OD^?. Hydroxyl impurities trapped at divalent impurity sites do not scatter phonons resonantly and it is shown that inhomogenous distribution of strong scattering centers modify thermal conductivity curves considerably. A simple tunneling model for the isotope shift suggests an effect similar to the “polaron” model of paraelastic centers. A relaxation time for phonon scattering by OH^? is derived, showing that the ground state may be understood in terms of a direct process, underlining that this system provides a connection between the theory of paraelectric/paraelastic impurities and Jahn-Teller systems.     

Cynaratriol,ein neues Guajanolid aus der Kardone Cynara cardunculusL. und der Artischocke C. scolymusL.(Compositate)

Cynaratriol, a new guajanolide from Cynara cardunculus L. and C. scolymus L. (Compositae) A new guajanolide given the name cynaratriol ( 4 ) was isolated from the leaves of Cynara cardunculus L The structure of 4 and its derivatives 3, 11, 13-triacetylcynaratriol ( 5 ) and 3, 13-dibenzoyl-cynaratriol ( 6 ) was deduced on the basis of IR.-, ¹H-NMR.-, ¹³C-NMR.- and mass spectroscopic data. 4 is also present in C. Scolymus L. as shown by GC./MS. analysis. The same absolute configuration is suggested for 4 as found for all other Cynara sesquiterpenes.