Autor: Olszewski, O. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Comparative analysis of numerical and experimental studies of the airflow around the sample of urban development
Autorzy:: Gumowski, K.
Olszewski, O.
Poćwierz, M.
Zielonko-Jung, K.
Powiązania:: https://bibliotekanauki.pl/articles/200297.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: environmental wind engineering
airflow around buildings
CFD simulation
k-ε realizable model of turbulence
inżynieria wiatrowa
środowisko
przepływ powietrza wokół budynków
symulacja CFD
Opis:: In this paper, on the background of a short overview of the recent advances in the field of Environmental Wind Engineering (EWE), a comparison of wind tunnel experiment and numerical simulation for some cases of airflow around an urban layout have been reported. The purpose of the study is quantitative and qualitative comparison of measurements in the wind tunnel as well as numerical simulation using Ansys Fluent software. The study is concerned mostly with the analysis of parameters which are essential in the building industry, such as pressure and velocity fields. In the numerical analysis the k-ε realizable model of turbulence with the basic model of boundary layer – Standard Wall Treatment, were used. Particular attention has been paid to accurate depiction of the conditions on the inlet and the selection of suitable computing.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 729-737
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Intercomparison of radon CR-39 detector systems conducted in CLORs calibration chamber
Autorzy:: Mamont-Cieśla, K.
Stawarz, O.
Karpińska, M.
Kapała, J.
Kozak, K.
Grządziel, D.
Chałupnik, S.
Chmielewska, I.
Olszewski, J.
Przylibski, T. A.
Żebrowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/148842.pdf
Data publikacji:: 2010
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: radon-222
CR-39 track detector
intercomparison
RadoSys
Opis:: Six radon laboratories, which perform indoor radon measurements to jointly investigate temporal variations of radon concentration in houses in a couple of regions in Poland, participated in the intercomparison exercise. There are involved three commercially available Hungarian RadoSys systems and four own laboratory methods. All of them are based on the etched-track CR-39 detectors. The intercomparison was conducted in a calibration laboratory of the Central Laboratory for Radiological Protection (CLOR), Warsaw, Poland, accredited by the Polish Center for Accreditation (previously AP 101, at present AP 057). Comparison measurements were performed during three expositions in the CLOR’s radon calibration chamber under controlled normal climatic conditions and steady radon concentration. The results were referred to the value of the radon concentration determined by AlphaGUARD monitor traceable to the primary 222Rn standard in Physikalisch-Technische Bundesanstalt (PTB), Braunchweig, Germany. The mean performance ratio defined as a ratio of the reference to participant’s result range from 0.88 to 1.31.
Źródło:: Nukleonika; 2010, 55, 4; 589-593
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Phase composition investigations of the Nd-Fe alloys processed by various methods
Autorzy:: Pawlik, K.
Wysłocki, J.
Olszewski, J.
Bodak, O.
Pawlik, P.
Powiązania:: https://bibliotekanauki.pl/articles/147201.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Nd-Fe binary system
intermetallic compounds
Mössbauer spectroscopy
phase composition
Opis:: Abstract In the paper, the phase composition changes for the series of Nd10+xFe90 x (x = 0; 0.5; 1; 1.5; 2; 2.5; 3; 3.5; 4) binary alloys, produced by long time annealing and rapid solidification methods were investigated. X-ray diffractometry and Mössbauer spectroscopy were used to determine the phase composition of the alloys. These structural investigations revealed the existence of two crystalline phases in the long time annealed samples: bcc á-Fe and rhombohedral Nd2Fe17 of the Th2Zn17-type structure. Furthermore, the single phase region was observed for the Nd concentration above 12 at.%. For the rapidly solidified ribbon samples, a low volume fraction of the alfa-Fe and the crystalline phase of hexagonal symmetry were detected.
Źródło:: Nukleonika; 2004, 49,suppl.3; 27-31
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Plasma reforming of liquid hydrocarbon in plasma - liquid systems
Autorzy:: Chernyak, V.
Nedybaliuk, O.
Martysh, E.
Olszewski, S.
Solomenko, O.
Shchedrin, A.
Levko, D.
Demchina, V.
Kudryavzev, V.
Powiązania:: https://bibliotekanauki.pl/articles/146464.pdf
Data publikacji:: 2012
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: plasma reforming
plasma chemical technologies
chemical conversion
plasma liquid systems
Opis:: This paper presents the results of an experimental study of plasma-assisted reforming of ethanol into molecular hydrogen in a modified tornado type electrical discharge. Plasma acts as a catalyst and initiates fast chain reactions that do not progress under normal conditions. Passivation of the electrodes in the discharge chamber during the discharge operation prevents their erosion and increases the working time of the reactor.
Źródło:: Nukleonika; 2012, 57, 2; 301-305
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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