Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Lead-Acid Battery Evaluation Based On Opencircuit Voltage Fluctuation Measurement
Kuparowitz, Tomáš ; Kuparowitz, Martin
The state of charge and the state of health are two crucial parameters of batteries. Current state of the art methods of their estimation include some as simple as measuring open circuit voltage, all the way to fuzzy logic estimation and constant online battery overview. Some main problems of such methods are either the length of single parameter evaluation cycle, or their inherent inaccuracy due to limitations in battery manufacture precision. This article proposes novel method of the lead-acid battery state of the health estimation, based on open circuit noise measurement. It reports the nature of changes in low frequency noise spectral density, that occur after catastrophic self-discharge failure or avalanche voltage drop in lead-acid batteries.
Tantalum Capacitor As A Mis Structure: Transport Characteristics Temperature Dependencies
Kuparowitz, Martin ; Kuparowitz, Tomáš
Temperature dependencies of a leakage current in normal mode are explained on the basis of a model, in which the solid state tantalum capacitor is considered as a metal-insulatorsemiconductor (MIS) heterostructure. The measurement was performed in temperature range from 105 to 155°C. Ohmic conductivity increases exponentially with increasing temperature with activation energy 0.94 eV. Tunneling voltage parameter and tunneling energy barrier decreases with increasing temperature, reaching values 0.45 to 0.26 eV.

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