The application of the thermodynamics of irreversible processes to welding arcs

The self-regulation of an inert gas shielded metal welding arc is dealt with briefly. A thermodynamic equation is derived for the self-regulation of such an arc.

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Durch das Abgegebene Kristallisationswasser Vorgetäuschte Thermostimulierte Coexoelektronenemission

Ohne Zusammenfassung

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Magnetization coils without iron core for high field intensities

A new theory of rectangular coils without an iron core is described which amends the old one of Fabry and Bitter. It enables us to compute field intensities in coils having very small openings, which the old theory could not do.

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, , , .

     

Die Röntgenolumineszenz der Kristalle von NaCl: Fe

Ohne Zusammenfassung

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Nacl: Fe

     

Einige neue Erkenntnisse über die Degradation von Titanaten im Zusammenhang mit der Exoemission

Ohne Zusammenfassung

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Le pouvoir résolvant du système „objectif-émulsion“

Sans résumé

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Zur Labyrinthstruktur bei Martensit

Ohne Zusammenfassung

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Nochmals Zur Arbeit Über Reines Eisen

Ohne Zusammenfassung

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Nichtdiagrammlinien im K-Spektrum von Neon

Ohne Zusammenfassung

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Beitrag zum Studium der Temperaturabhängigkeit der Sättigungsmagnetisierung bei Manganzinkferriten

Ohne Zusammenfassung

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Bemerkung zur Arbeit von L. ?pa?er: Die Struktur der Oberfl?chlichen Abschlussbereiche in den (100) Ebenen in Eisen [4]

Ohne Zusammenfassung

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L. paek (100)

     

The effect of the orientation of zinc single crystals and of the rate of growth on the direction of cell substructure

The effect of the orientation of zinc single crystals and the rate of growth on the direction of the formation of cellular substructure is observed. A model accounting for the observed dependences is proposed.

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Die Temperaturabhängigkeit der Koerzitivkraft von Mangan-Ferriten

Ohne Zusammenfassung

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Zur halbempirischen Theorie der Sekundärelektronenausbeute von Metallen

Ohne Zusammenfassung

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Some applications of the discrete fourier transform to problems of crystal lattice deformation I

The theory of the discrete Fourier transform [1], [2] is applied in solving a system of difference equations describing the positions of atoms in a deformed crystal lattice. The crystal lattice is approximated by the Born-Kármán model modified to include the internal energy of the undeformed crystal.

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, , , [1] [2]. - , , .

     

Die Wirkung von Flüssigkeitsdämpfen auf den Geigerschen Spitzenzähler

Ohne Zusammenfassung

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The motion of 90° wedge domains in BaTiO3 in an alternating electric field

The paper deals with the motion of 90° wedge domains in BaTiO₃ in an alternating field of 50 c/s. The critical field, the positional hysteresis loops with double asymmetry, the production of wedges with polarization perpendicular to the field and 180° substructure in the wedges were studied. The differences between the behaviour of the wedges and the individual 90° walls are pointed out which are caused by differences in the energy balance of these formations and by different interactions with 180° processes. The upper limit of contribution of the wedge motion to the initial permittivity is estimated. The results are discussed from the phenomenological point of view.

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90° BaTiO₃

90° BaTiO₃ , 50 Hz. , , , , , , 180° . 90° , 180° . , . .

     

The temperature dependence of the refractive index of germanium

The temperature dependence of the refractive index of germanium in a wave-length region of 1·8–5·5 and temperature region of 100–530 °K is given for three samples of single crystal germanium having different concentrations of impurities. The temperature dependence of the refractive index is non-linear. Our results are compared with those of other authors. An attempt is also made to theoretically interpret the observed dependence.

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1,8–5,5 100–530° K . . . , .

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In conclusion the author thanks Dr. Trousil from the Institute of Technical Physics, Czechoslovak Academy of Sciences, Prague, for supplying the germanium, Mr. Tma for preparing and polishing the prisms, Dr. Tauc from the same institute for enabling most of the measurements to be carried out in his laboratory, and Mrs. ilhavá for help in the measurements.     

Le Professeur Běhounek Sexagénaire

Sans résumé

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