A Feynmanian approach to phenomenology of the current-voltage problem

Causal relationships between electric current, field intensity and the internal variables determining the current-voltage characteristic can be topologically represented, paralleling, in a certain sense, the use of Feynman diagrams in quantum field theory. In connection with the diagrams thus formed, quantitative formalism can be developed. The differential equation of the current-voltage characteristic di/du= _d (i, u), with _d the so-called differential conductivity function, constitutes the main result. Presence of a positive feedback loop in the diagram pattern seems to be an obligatory condition for the occurrence of bulk-originated current-controlled negative differential resistance.Lumumbova 1, Praha 8, Czechoslovakia.     

On the crystal structure of the bubble ferrite films

Using the EM and HEED investigation the dependence of formation of tetragonal or cubic structure on composition in manganese and manganese-copper ferrite films was confirmed.     

Dielectric relaxation effect in MIM systems

On applying voltage to a thin film Al-Al₂O₃-M system, one observes a decrease of the leakage current with time. After a long period (10³–10⁴ s) the current settles at a new value, lower by several orders of magnitude. After shortcircuiting the sample, there appears a discharge current of reversed polarity, with decay time again of the order of 10³ s. This effect has been reproducibly observed in the temperature range 80–500 K. The present paper is devoted to the experimental study of this relaxation phenomenon in dependence on the parameters of the system (thickness of the dielectric layer, temperature, and material of the upper electrode).The paper is based on RNDr Thesis of the first author.     

Влияние матерала ано да на формирование положителъного стол ба тлеющего разряда

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The influence of anode material on the forming of a positive column in a glow discharge

     

ИЗУЧЕНИЕ ИНТЕГРАЛЬН ОЙ И ЛОКАЛЬНОЙ ЧУВСТВИТЕЛЬНОСТИ ФО ТОКАТОДОВ И ИХ ВЛИЯНИ Е НА ГОРИЗОНТАЛЬНЫЙ УЧ АСТОК ХАРАКТЕРИСТИК И СЦИНТИЛЛЯЦИОННОГО Д ЕТЕКТОРА

, RCA 5819, 19 41PK411 ( ). - , .