Temat: stationary - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Limitations of WSSUS modeling of stationary underwater acoustic communication channel
Autorzy:: Kochańska, I.
Nissen, I.
Powiązania:: https://bibliotekanauki.pl/articles/331730.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: underwater communications
impulse response
stationary time
stationary bandwidth
adaptive communications
WSSUS modeling
Opis:: Performances of underwater acoustic communication (UAC) systems are strongly related to specific propagation conditions of the underwater channel. Due to their large variability, there is a need for adaptive matching of the UAC systems signaling to the transmission properties of the channel. This requires a knowledge of instantaneous channel characteristics, in terms of the specific parameters of stochastic models. The wide-sense stationary uncorrelated scattering (WSSUS) assumption simplifies the estimation of terrestrial wireless channel transmission properties. Although UAC channels are hardly ever WSSUS, the rationale of such a stochastic modeling is that over a short period of time, and for a limited frequency range, this assumption is reasonably satisfied. The limits of application of the local-sense stationary uncorrelated scattering (LSSUS) model are determined by the stationary time and frequency. This paper presents the results of LSSUS model analysis for UAC channel measurements gathered by the former Research Department for Underwater Acoustics and Marine Geophysics (FWG), now part of the WTD71, during the SIMO experiment in the Bornholm Basin of the Baltic Sea.
Źródło:: Hydroacoustics; 2016, 19; 229-238
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Role of rpoS in the regulation of glyoxalase III in Escherichia coli.
Autorzy:: Benov, Ludmil
Sequeira, Fatima
Beema, Anees
Powiązania:: https://bibliotekanauki.pl/articles/1041571.pdf
Data publikacji:: 2004
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: methylglyoxal
stationary phase
glyoxalases
RpoS
Opis:: Methylglyoxal is an endogenous electrophile produced in Escherichia coli by the enzyme methylglyoxal synthase to limit the accumulation of phosphorylated sugars. In enteric bacteria methylglyoxal is detoxified by the glutathione-dependent glyoxalase I/II system, by glyoxalase III, and by aldehyde reductase and alcohol dehydrogenase. Here we demonstrate that glyoxalase III is a stationary-phase enzyme. Its activity reached a maximum at the entry into the stationary phase and remained high for at least 20 h. An rpoS- mutant displayed normal glyoxalase I and II activities but was unable to induce glyoxalase III in stationary phase. It thus appears that glyoxalase III is regulated by rpoS and might be important for survival of non-growing E. coli cultures.
Źródło:: Acta Biochimica Polonica; 2004, 51, 3; 857-860
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: New type of Piezoresistive Pressure Sensors for Environments with Rapidly Changing Temperature
Autorzy:: Tykhan, M.
Ivakhiv, O.
Teslyuk, V.
Powiązania:: https://bibliotekanauki.pl/articles/221026.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: pressure
sensor
non-stationary
temperature
Opis:: The theoretical aspects of a new type of piezo-resistive pressure sensors for environments with rapidly changing temperatures are presented. The idea is that the sensor has two identical diaphragms which have different coefficients of linear thermal expansion. Therefore, when measuring pressure in environments with variable temperature, the diaphragms will have different deflection. This difference can be used to make appropriate correction of the sensor output signal and, thus, to increase accuracy of measurement. Since physical principles of sensors operation enable fast correction of the output signal, the sensor can be used in environments with rapidly changing temperature, which is its essential advantage. The paper presents practical implementation of the proposed theoretical aspects and the results of testing the developed sensor.
Źródło:: Metrology and Measurement Systems; 2017, 24, 1; 185-192
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Extremes in multivariate stationary normal sequences
Autorzy:: Wiśniewski, Mateusz
Powiązania:: https://bibliotekanauki.pl/articles/1339017.pdf
Data publikacji:: 1998
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: stationary normal sequences
extreme order statistics
Opis:: This paper deals with a weak convergence of maximum vectors built on the base of stationary and normal sequences of relatively strongly dependent random vectors. The discussion concentrates on the normality of limits and extends some results of McCormick and Mittal [4] to the multivariate case.
Źródło:: Applicationes Mathematicae; 1998-1999, 25, 3; 375-379
1233-7234
Pojawia się w:: Applicationes Mathematicae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: E–learning Tools in Distance and Stationary Education
Autorzy:: Krupski, M.
Cader, A.
Powiązania:: https://bibliotekanauki.pl/articles/108682.pdf
Data publikacji:: 2009
Wydawca:: Społeczna Akademia Nauk w Łodzi
Tematy:: e-learning
distance education
stationary education
Opis:: The foundation and development of the Information Society set new tasks before universities, particularly technical schools all over the world. Since the knowledge of computer science doubles approximately every three years, there is a necessity for IT specialists of a constant self-education. Following the changes is possible only using electronic tools and information stored in the Internet. The fact is that a lot of universities do not pay enough attention to get their students into the habit of using e-learning tools every day. Since higher education needs to be effective and efficient, it is indispensable to use distance learning tools to support both stationary and constant learning. This paper presents the comparative research of the level of the application of the elearning tools, conducted among the students of computer science of the Academy of Humanities and Economics in Lodz.
Źródło:: Journal of Applied Computer Science Methods; 2009, 1 No. 1; 67-75
1689-9636
Pojawia się w:: Journal of Applied Computer Science Methods
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Stationary underwater channel experiment: Acoustic measurements and characteristics in the Bornholm area for model validations
Autorzy:: Nissen, I.
Kochańska, I.
Powiązania:: https://bibliotekanauki.pl/articles/332083.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: underwater communications
stationary time
WSSUS indication
Opis:: The underwater acoustical channel is time-variant, and even on small time scales there is often existing no ‘acoustical frozen ocean’. Popular is the use of WSSUS-channel transmission modeling (Wide-Sense Stationary Uncorrelated Scattering) for the stochastic description of bandpass signals in GSM mobile phones with moving participants; since this results in a halved number of model parameters. For underwater sound applications such as detection, navigation and communication this approach provides limited a-priori-knowledge for adaptive algorithms with moving cooperative participants. The FWG of the WTD71 is collecting phase-accurate channel measurements from different sea areas in different time and application scenarios, with moving and stationary communication nodes since 2001. This paper presents a SIMO experiment from 2010, with a high precision continuous observation period of eleven hours using two stationary bottom nodes, mostly uncoupled from the influence of surface waves and from the sea floor. Transmitter and receiver node with a distance of two nautical miles between them were stationary installed on the bottom in shallow watersin the Bornholm Basin of the Baltic Sea. The sound speed has been measured continuously in the water column with a moving measurement chain. The question for this experiment was: Is the WSSUS-property fulfilled in water, when participants communicate motionless with negligible current, bottom influence and movements of the surface? The answer is: No, not in this experiment.
Źródło:: Hydroacoustics; 2016, 19; 285-296
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Reduction of railway bridge vibration with groundhook mass damper
Autorzy:: Wcisło, M.
Powiązania:: https://bibliotekanauki.pl/articles/115491.pdf
Data publikacji:: 2012
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Tematy:: mass damper
bridge dynamics
non-stationary loads
Opis:: The aim of this research is to compare eff ectiveness of an ordinary mass damper with a more complex one equipped with an extra spring element connecting the damper mass with the ground. For both simple- and nonlinear- primary structure models and for stable load state, theoretically effi ciency of both types of dampers is just the same therefore their effi ciencies in bridge structures subjected to non-stationary load are investigated.
Źródło:: Challenges of Modern Technology; 2012, 3, 4; 53-57
2082-2863
2353-4419
Pojawia się w:: Challenges of Modern Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The market as the Minority Game and the statistical physics
Giełda jako gra mniejszościowa i fizyka statystyczna
Autorzy:: Bolonek, Katarzyna
Powiązania:: https://bibliotekanauki.pl/articles/905683.pdf
Data publikacji:: 2008
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:: minority game
stationary states
stability
Nash equilibria
Opis:: The simplest version of minority game is introduced. It is shown how the minority game can result from the behaviour of individuals. The stability analysis of stationary state is briefly discussed. The modification of the game is described which leads to Nash equilibra as stationary states.
W ostatnich latach obserwuje się wzrastające zainteresowanie zastosowaniami metod fizyki statystycznej w matematycznej teorii rynków finansowych. Okazuje się, że takie idee i metody mechaniki statystycznej, jak równania stochastyczne, rozkłady Gibbsa, przejścia fazowe czy teoria fluktuacji znakomicie nadają się do opisu zjawisk cechujących rynki finansowe. W referacie podaję zwięzłą dyskusję analizy metodami fizyki matematycznej prostego modelu giełdy - gry mniejszościowej, zdefiniowanej jako gra, w której w każdym kroku zyskuje gracz, który podejmuje decyzję taką jak mniejszość graczy. Okazuje się, że standardowe metody fizyki (funkcja Ljapunowa, równanie Langevina, teoria fluktuacji) pozwalają dokładnie opisać stany stacjonarne gry łącznie z takimi własnościami, jak jednoznaczność, minimalizacja przewidywalności, duże fluktuacje w fazie symetrycznej itp.
Źródło:: Acta Universitatis Lodziensis. Folia Oeconomica; 2008, 216
0208-6018
2353-7663
Pojawia się w:: Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: On the rate of strong mixing in stationary Gaussian random fields
Autorzy:: Cheng, Raymond
Powiązania:: https://bibliotekanauki.pl/articles/1293383.pdf
Data publikacji:: 1992
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: stationary random field
strong mixing
prediction theory
Opis:: Rosenblatt showed that a stationary Gaussian random field is strongly mixing if it has a positive, continuous spectral density. In this article, spectral criteria are given for the rate of strong mixing in such a field.
Źródło:: Studia Mathematica; 1991-1992, 101, 2; 183-191
0039-3223
Pojawia się w:: Studia Mathematica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Induced stationary process and structure of locally square integrable periodically correlated processes
Autorzy:: Makagon, Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/1216923.pdf
Data publikacji:: 1999
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:: periodically correlated process
stationary process
imprimitivity theorem
Opis:: A one-to-one correspondence between locally square integrable periodically correlated (PC) processes and a certain class of infinite-dimensional stationary processes is obtained. The correspondence complements and clarifies Gladyshev's known result [3] describing the correlation function of a continuous periodically correlated process. In contrast to Gladyshev's paper, the procedure for explicit reconstruction of one process from the other is provided. A representation of a PC process as a unitary deformation of a periodic function is derived and is related to the correspondence mentioned above. Some consequences of this representation are discussed.
Źródło:: Studia Mathematica; 1999, 136, 1; 71-86
0039-3223
Pojawia się w:: Studia Mathematica
Dostawca treści:: Biblioteka Nauki

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