Autor: Cisak, D. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Level of information about gynaecological prevention in teenagers at risk from social exclusion, referred by family court rulings to juvenile attendance centres - a pilot study
Autorzy:: Bobinski, M.
Piatkowski, W.
Sadowska, A.
Cisak, D.
Wydawca:: Instytut Medycyny Wsi
Powiązania:: https://bibliotekanauki.pl/articles/51995.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Tytuł:: A role of the heat and work uncompensated transformations in the balance of entropy and the turbomachinery eﬃcienc
Autorzy:: Kowalczyk, T.
Ziółkowski, P.
Sławiński, D.
Cisak, M.
Badur, J.
Tematy:: entropy balance
entropy sources
uncompensated transformations
isentropic eﬃciency
polytropic eﬃciency
eulerian ﬂuid
turbine stage
Puzyrewski number; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/175450.pdf Link otwiera się w nowym oknie
Opis:: The notion of heat uncompensated transformation has early been introduced by Clausius in 1854 and next, after ﬁfty years of forgetting, in 1904 Duhem has revalorized it and combined it with a new notion of work uncompensated transformation [3]. In this way the so-called ClausiusDuhem inequality has been established. In our paper we wish to present a novelized procedure of estimating the role of the uncompensated transformations of heat and work within the ﬂow of viscous and heat conducting working ﬂuid like water stream. The original procedure was introduced by Puzyrewski and it is essential in expressing of a local, in time and space, balance of entropy. Futhermore, this unique approach leads to redeﬁnition of the eﬃciency notion, as is usually applied to ﬂuid-ﬂow machineries, to a new one important in computational ﬂuid dynamics (CFD) three-dimensional modeling. As a result, it is shown that usage of the polytropic eﬃciency, instead of the isentropic eﬃciency, is more convenient and seems to be natural in CFD approach. Helpfully, we have also found a correlation between those two eﬃciency deﬁnitions with usage of proposed new dimensionless (criterion) number.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Estimation of height changes of GNSS stations from the solutions of short vectors and PSI measurements
Autorzy:: Krynski, J.
Zak, L.
Ziolkowski, D.
Cisak, J.
Lagiewska, M.
Tematy:: height changes
GNSS
Persistent Scatterer Interferometry
radar satelitarny
deformacja powierzchni; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/145302.pdf Link otwiera się w nowym oknie
Opis:: Time series of weekly and daily solutions for coordinates of permanent GNSS stations may indicate local deformations in Earth’s crust or local seasonal changes in the atmosphere and hydrosphere. The errors of the determined changes are relatively large, frequently at the level of the signal. Satellite radar interferometry and especially Persistent Scatterer Interferometry (PSI) is a method of a very high accuracy. Its weakness is a relative nature of measurements as well as accumulation of errors which may occur in the case of PSI processing of large areas. It is thus beneficial to confront the results of PSI measurements with those from other techniques, such as GNSS and precise levelling. PSI and GNSS results were jointly processed recreating the history of surface deformation of the area of Warsaw metropolitan with the use of radar images from Envisat and Cosmo-SkyMed satellites. GNSS data from Borowa Gora and Jozefoslaw observatories as well as from WAT1 and CBKA permanent GNSS stations were used to validate the obtained results. Observations from 2000–2015 were processed with the Bernese v.5.0 software. Relative height changes between the GNSS stations were determined from GNSS data and relative height changes between the persistent scatterers located on the objects with GNSS stations were determined from the interferometric results. The consistency of results of the two methods was 3 to 4 times better than the theoretical accuracy of each. The joint use of both methods allows to extract a very small height change below the level of measurement error.
Dostawca treści:: Biblioteka Nauki

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