The effect of supermolecular structure on some electric properties of layers of poly(N-vinylcarbazole)

Current-voltage characteristics were measured for sandwich samples of poly(N-vinylcarbazole) amorphous layers and layers with pronounced supermolecular structure, similar to the fibrillar structure. Analysis of the superlinear regions of the current-voltage dependences of 3–35 μm thick samples with fibrillar structure showed that the effects of space charge are important. Results obtained for amorphous layers agree with an earlier interpretation of the current-voltage curves based on the Poole-Frenkel effect.     

Gamma-ray spectrum of192Au

The gamma-ray spectrum of 5 h¹⁹²Au has been measured by means of the germanium detector. A number of about 200 new transitions were found in addition to the transitions known from the conversion electron measurement of Nyman et al. (Arkiv f. fysik29 (1965), 321) and 82 internal conversion coefficients were determined from the relations between conversion lineand gamma-ray intensities. From energies, intensities and multipolarities of transitions the existence of 20 new levels is very probable, in many cases with spin-parity assignments too.     

Relation between microhardness and recrystallization of nickel

Czechoslovak Journal of Physics -     

Electron velocity distribution in a fully ionized plasma under the action of crossed electric and magnetic fields

A fully ionized spatially homogeneous plasma is subjected to weak constant crossed electric and magnetic fields, and the velocity distribution function for the electrons is studied. The Fokker-Planck type expression for the Lorentz gas is employed for the collision term in the Boltzmann equation. This equation is solved by direct expansion and some conditions of convergence of this expansion are obtained.The author wishes to express his thanks to Prof. J. Kracík, DrSc., for valuable advice and suggestions.     

Interactions in multicomponent systems containing surfactants. System silver iodide — methylene blue and sodium dodecyl sulphate

The precipitation and dissolution of AgI in the presence of methylene blue (MB · Cl) and sodium dodecyl sulphate (NaDS) was followed by X-ray diffraction analysis.At high MB · Cl concentration, the absence of AgI precipitates was observed, which is explained by considering the redox process MB⁺ + 2I^– MB^– + I₂. The decrease in I^– concentration causes dissolution or inhibition of growth of solid AgI which is significant at relatively high MB · Cl concentrations. The addition of NaDS causes the disappearance of these effects, which is explained by the incorporation of MB in NaDS micelles.These explanations are supported by the potentiometric measurements using Ag/Ag₂S and Pt electrodes.     

Ermüdungserscheinungen der infrarotbestrahlten Silber-Cäsium-Photokathoden

Zusammenfassung In dieser Arbeit werden die Erscheinungen der normalen und anomalen, durch Infrarotstrahlung verursachten und von uns schon früher an diesen Photokatoden beobachteten Ermüdung von Silber-Cäsium-Photokathoden untersucht. Diese Erscheinungen wurden an durchsichtigen sowie undurchsichtigen, durch verschiedene Technologien zubereiteten Photokathoden festgestellt. Es wurden Messungen der Strahlungsintensitäts-, Temperatur- und Spektralverteilungsabhängigkeit der normalen und anomalen Ermüdung durchgeführt. Es werden die Ursachen der Unübereinstimmigkeit im Vergleich mit Arbeiten von De Boer und Teves besprochen. Ferner wurden die Zeitverläufe der Ermüdung bei der Abwechslung der Bestrahlungs- und Dunkelzyklen studiert.

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Emission and absorption of plane impulsive gravitational waves

Emission and absorption of plane impulsive waves of radiation by a thin shell of dust are studied. At the moment of interaction local conservation laws apply. An impulsive gravitational wave does not participate in the energy balance. Rather, it is associated with a change in isotropy of the source (absorber). Changes in the kinetic energy of the source exactly match the changes in its rest mass.