Autor: Dawidowicz, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Crystallization Process in Porous and Nonporous Vycor Glass
Autorzy:: Jasińska, B.
Dawidowicz, A. L.
Pikus, S.
Powiązania:: https://bibliotekanauki.pl/articles/2042215.pdf
Data publikacji:: 2005-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
Opis:: Three stages of thermal and chemical processing of Vycor glass were carried out. Raw material, the glass with small and big pores was studied. In each stage of study various crystallinity degrees of investigated material were obtained. The relation between crystallinity degree and the intensity of o-Ps components was determined. In nonporous material a high correlation between o-Ps intensity and crystallinity degree was found. In porous material the decrease in total o-Ps intensity can be a measure of the crystallinity degree.
Źródło:: Acta Physica Polonica A; 2005, 107, 5; 724-728
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Dynamic characteristics of the proton exchange membrane fuel cell module
Autorzy:: Cieśliński, J. T.
Kaczmarczyk, T. Z.
Dawidowicz, B.
Powiązania:: https://bibliotekanauki.pl/articles/240068.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: PEM fuel cell
hydrogen
dynamic characteristics
ogniwo paliwowe PEM
wodór
charakterystyka dynamiczna
Opis:: The paper describes a fuel cell based system and its performance. The system is based on two fuel cell units, DC/DC converter, DC/AC inverter, microprocessor control unit, load unit, bottled hydrogen supply system and a set of measurement instruments. In the study presented in the paper a dynamic response of the proton exchange membrane (PEM) fuel cell system to unit step change load as well as to periodical load changing cycles in the form of semi-sinusoidal and trapezoidal signals was investigated. The load was provided with the aid of an in-house-developed electronic load unit, which was fully PC controlled. The apparatus was commissioned by testing the steady-state operation of the module. The obtained efficiency of the fuel cell shows that the test apparatus used in the study provides data in substantial agreement with the manufacturer’s data.
Źródło:: Archives of Thermodynamics; 2018, 39, 4; 125--140
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Feasibility study of the space synthetic aperture radar for the SSETI-ESMO project
Autorzy:: Dawidowicz, B.
Kulpa, K.
Powiązania:: https://bibliotekanauki.pl/articles/307628.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: SSETI
ESMO
feasibility study
space SAR radar
Opis:: The following paper presents the analysis of the feasibility study of the SAR radar for lunar space missions. The European StudentsMoon Orbiter (ESMO) project is con- ducted by the Students Space Exploration and Technology Initiative (SSETI) association. The phase A of this project is supported by the European Space Agency (ESA).
Źródło:: Journal of Telecommunications and Information Technology; 2007, 1; 63-68
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Liquation of Vycor Glasses - Study by Positron Annihilation Lifetime Method
Autorzy:: Jasińska, B.
Dawidowicz, A. L.
Radkiewicz, S.
Powiązania:: https://bibliotekanauki.pl/articles/2024266.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
61.43.Gt
Opis:: Two Vycor glasses of different percentages of the components were liquated between 725 K and 950 K and leached in order to produce pores. Little intermolecular voids characterized by ortho-positronium lifetime valueτ$\text{}_{2}$≈1.5 ns were observed simultaneously. At the first stage of pore formation the intensity I$\text{}_{2}$ decreased considerably for both glasses, while at liquation temperatures higher than 825 K it increased again. The increase in I$\text{}_{2}$ resulted from changes in the properties of the bulk material. The growth ofτ$\text{}_{2}$ in this range of temperatures was also observed.
Źródło:: Acta Physica Polonica A; 2001, 99, 3-4; 379-384
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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