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Start Over Author "Zelenka J." Journal czechoslovak journal of physics
13 results on '"Zelenka J."'

2. Abstracts

Author

Wohanka, H., Kungebiel, G., Locke, M., Klingebiel, G., Suk, J., Daďourek, K., Tichý, J., Zelenka, J., Kraus, J., Hrivnák, L'., Taraba, O., Petržílka, V., Tichý, J., Zelenka, J., Zima, V., Dočekal, J., Vachala, V., Hammerschmied, V., Kroupa, V., Hanzl, J., Nykl, F., Soška, F., Sodomka, L., Kyncl, L., and Jech, M.

Published
1966
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3. Electromechanical properties of bismuth germanium oxide (Bi12GeO20)

Author

Zelenka, J.

Abstract

The elastic and piezoelectric constants and their temperature coefficients of bismuth germanium oxide have been determined. All of the elastic and piezoelectric constants were obtained from dynamic measurements of piezoelectrically driven narrow bars and thin plates at the temperature 22 °C. The temperature coefficients were measured on the same resonators in the temperature range from 16 °C to 70 °C. The thermal expansion measured in the temperature range from 50 °C to 200 °C is also given.

Published
1978
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4. The polarizing effect in Bi12GeO20 crystals

Author

Zelenka, J.

Abstract

The results of the measurement of the d-c electric field effect on the resonant frequency of the longitudinally vibrated bars from Bi12GeO20 crystals parallel to the planes (001) and (111) are given. The polarizing correction terms of the elastic couplings are calculated from the change of the frequency.

Published
1980
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5. The frequency spectrum of nt-cut quartz plates

Author

Zelenka, J.

Abstract

An approximate, one-dimensional theory derived and applied by Lee to the solution of coupled odd harmonics of extensional vibration, even orders of flexural vibrations and a width-shear vibration is used for solution of coupled odd orders of flexural vibrations, even harmonics of extensional vibrations and width-shear vibration. Closed-form solution suitable for calculation of the frequency spectrum of mentioned type of vibrations are obtained and the frequency spectrum of NT-cut quartz rectangular plate with simple orientation is calculated. The obtained theoretical results are compared with measurements.

Published
1973
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6. A note on the ageing of high precision piezoelectric crystal units

Author

Zelenka, J.

Abstract

Attention is paid to the character of the resonance frequency time dependence of high precision piezoelectric crystal units of the GT type for a frequency of 100 kHz and of the AT type for a frequency of 2·5 MHz. It is shown that the long-term effect of temperature changes plays an important role in ageing in the initial period.

Published
1966
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7. сОДЕРжАНИЕ РАБОт, ОпУБлИкОВАННых тОлькО В ЧЕшскОМ ИжДАНИИ НАстОьЩЕгО жУРНАлА

Author

HollÄnder, E. F., Srnka, D., Jech, Č., Lehraus, I., Mokrý, P., Slavík, B., Wooster, W. A., SkŘivánek, J., Veselá, M., Karel, F., Gála, J., Tichý, J., Zelenka, J., Kvasnica, J., Nutting, J., Libovický, S., Vacek, K., Antončík, E., Eckertová, L., Váňa, J., Pekárek, L., Pátý, L., Pohanka, J., Dohnálek, J., Frič, V., Hlubuček, V., Holan, V., ďatlov, J., Bartoš, H., Plecitý, M., Mareš, P., Hábovčík, P., Veis, š., Láska, S., Pekárek, L., Krpata, V., Novák, M., šícha, M., Bakule, R., šícha, M., Veselý, V., Kracík, J., ďurček, J., Kracík, J., Kocian, P., Gross, B., Truneček, V., Hernoch, V., Hix, A., Eckertová, L., Kryška, L., Eckertová, L., Stratonov, O., Jedlička, M., Tomková, E., VyslouŽil, A., Zikeš, V., Schneider, P., Vaško, A., Jedlička, M., štoksa, L., Prchlík, J., GadŽuk, B., Beránek, I., Holý, B., Ladman, R., Pátý, L., NeuŽil, M., Eckertová, L., Kryška, L., Pátý, L., Schürer, P., Veis, š., Schürer, P., Janatka, M., Urgošík, B., Neuman, J., Bláha, A., Pátý, L., Veis, š., Neuman, J., Bláha, A., PŘibyl, F., Eröss, E., ŽiŽka, E., Marton, K., Harman, R., RůŽička, J., Pátý, L., Plichta, L., šípek, L., štícha, M., Vejvodová, J., Teichman, J., Rytina, K., Seidl, M., Klíma, R., Rohlíček, F., Jareš, V., Lom, T., Koziak, R., Podskalský, E., Pecha, V., Vojtášek, S., Horna, J., Zima, V., čičmanec, P., šurka, š., Mack, Z., Szánto, L., and Kunzl, V.

Published
1961
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8. СОДЕРЖАНИЯ РАБОТ, ВЫШ ЕДШИХ ТОЛЬКО В ЧЕШСКО М ИЗДАНИИ НАСТОЯЩЕГО Ж УРНАЛА (Československý časopis pro fysiku)

Author

Marek, J., Gerber, R., Kratochvílová, E., Rákos, J., Krejčí, V., Seidl, R., Pačes, J., Eckertová, L., Vacek, K., Zelenka, J., Tichý, J., Pátek, K., Damašková, S., Krempaský, J., Frank, H., Jaňour, Z., Střelka, V., Kvasnica, J., Hladík, A., Plajner, Z., Polcarová, M., Santholzer, V., Kotíková, M., Wooster, W. A., Zítka, B. H., and Šuda, P.

Published
1959
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9. Содержания работ, выш едших толъко в чешско м издании настояшего ж урнала (Československý časopis pro fysiku)

Author

Havel, V., Mašín, A., Zelenka, J., Češpíro, Z., Fingerland, A., Kubal, J., Beneš, J., Hrkal, Z., Voříšek, M., Wotruba, K., Vančura, A., Odehnal, M., Soudek, I., Kroupa, F., Hodan, R., Frank, H., Šolc, I., Dušek, J., Koči, J., SpurnÝ, Z., Pátý, L., and Kadečková, S.

Published
1959
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