National Repository of Grey Literature 295 records found  beginprevious279 - 288next  jump to record: Search took 0.01 seconds. 
Bifunctional Electrode for Fuel Cells
Novák, V. ; Vondrák, Jiří
We were prepared five samples of electrocatalyst by a chemical reaction of the potassium permanganate and the carbon black. These samples were doped, except for one, by the salts of divalent Mn, Mg, Ni and Zn metals.
Basic properties of electrochemical supercapacitors
Vondrák, Jiří ; Sedlaříková, M. ; Novák, V. ; Nečesal, P. ; Černý, R.
The fundamental properties of two kinds of supercapacitors was investigated. Two different samples were obtained. One is capacitor STAR of nominal value 7 F and the other ULTRA was nominal capacity 100 F. Linear voltammetry, self-discharge curves, and indepedance spectroscopy was used for monitoring their properties.
Electrochemical properties of PMMA-PC gels containing cadmium salts
Vondrák, Jiří ; Reiter, Jakub ; Sedlaříková, M. ; Bartušek, Karel ; Novák, V. ; Nováček, X.
We have described the preparation and properties of PMMA-PC gel polymer electrolytes containing lithium salts, tetraethylamonium salts and salts of Na, Mg, and Zn.
Thermodynamics and digital simulation of intercalation processes
Vondrák, Jiří ; Reiter, Jakub ; Sedlaříková, M. ; Novák, V.
The thermodynamic theory of reversible electrochemical intercalation reactions is based on the consideration of interaction energy between two neighbouring sites.
Correlation of anomalous magnetic properties and mechanical treatment of Bi.sub.2./sub.Sr.sub.2./sub.Ca.sub.2./sub.Cu.sub.3./sub.O.sub.10./sub. silver-sheathed tapes
Yurchenko, Vitaliy ; Jirsa, Miloš ; Kováč, P. ; Novák, Václav
Due to granular character of the tapes, the total magnetic moment is composed of two additive contributions of intra- and intergranular moments. We pressed our samples in a controlled way and observed evolution of the critical current density.
Correlation of anomalous magnetic properties and mechanical treatment of Bi.sub.2./sub.Sr.sub.2./sub.Ca.sub.2./sub.Cu.sub.3./sub.O.sub.10./sub. silver-sheathed tapes
Yurchenko, Vitaliy ; Jirsa, Miloš ; Kováč, P. ; Hušek, I. ; Novák, Václav
Measurements of induced critical currents in silver-sheathed Bi.sub.2Sr./sub.2Ca.sub.2Cu./sub.3O.sub.10 tapes will the aim to investigate the anomaly of intergranular currents. We gradually destroyed the inter-grain links by imposing and increasing uniaxial stress along the tape normal, and observed the corresponding evolution of the magnetic hysteresis loop shape.
Elastické konstanty 2H martenzitu CuAlNi
Sedlák, Petr ; Seiner, Hanuš ; Landa, Michal ; Novák, Václav ; Šittner, Petr ; Manosa, L.
Elastic constants of cubic austenite and orthorhombic 2H martensite phases existing in Cu-Al-Ni shape memory alloy were determined by ultrasonic pulse - echo method using single crystal specimens.
Elastické vlastnosti jednotlivých fází slitin s tvarovou pamětí vyšetřovaných pomocí RUS
Landa, Michal ; Novák, Václav ; Sedlák, Petr ; Manosa, L. ; Šittner, Petr
Elastic constants of the austenite phase in CuAlNi shape memory alloys single crystal and their temperature dependence were determination by ultrasonic pulse-echo and resonant ultrasound spectroscopy methods. RUS is novel method in which all components of elastic tensor are detrmined from measured resonance frequencies of freely vibrating speciment.

National Repository of Grey Literature : 295 records found   beginprevious279 - 288next  jump to record:
See also: similar author names
22 NOVÁK, Václav
3 Novák, Viktor
1 Novák, Viktor Bc.
1 Novák, Vilém
14 Novák, Vladimír
10 Novák, Vlastimil
22 Novák, Vojtěch
22 Novák, Václav
10 Novák, Vít
11 Novák, Vítězslav
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