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Wyszukujesz frazę "fluctuations" wg kryterium: Temat


Tytuł:
Charge transfer fluctuations as a QGP signal
Autorzy:
Jeon, S.
Shi, L.
Bleicher, M.
Tematy:
quark-gluon plasma
event-by-event fluctuations
charge transfer fluctuations
Pokaż więcej
Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/148475.pdf  Link otwiera się w nowym oknie
Opis:
In this study, we analyze the recently proposed charge transfer fluctuations within a finite pseudorapidity space. As the charge transfer fluctuation is a measure of the local charge correlation length, it is capable of detecting inhomogeneity in the hot and dense matter created by heavy-ion collisions. We predict that going from peripheral to central collisions, the charge transfer fluctuations at midrapidity should decrease substantially while the charge transfer fluctuations at the edges of the observation window should decrease by a small amount. These are consequences of having a strongly inhomogeneous matter where the QGP component is concentrated around midrapidity. We also show how to constrain the values of the charge correlations lengths in both the hadronic phase and the QGP phase using the charge transfer fluctuations. Current manuscript is based on the two recent papers [10, 13].
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Refined model of passive branch damper of pressure fluctuations
Autorzy:
Kudźma, S.
Kudźma, Z.
Tematy:
pressure fluctuations
damper
noise
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Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:
https://bibliotekanauki.pl/articles/279529.pdf  Link otwiera się w nowym oknie
Opis:
This paper presents an analysis of the influence of the kind of a friction model on the dimensioning of a branch pressure fluctuation damper. The mathematical model of the branch damper is defined by determining the damper input impedance and finding its minimum corresponding to the maximum effectiveness in reducing pressure fluctuations. Three kinds of friction for the oscillatory flow in the damper, i.e. a lossless line, steady friction and a nonstationary friction model, are considered. Experimental studies confirmed that the use of the nonstationary friction model in the calculation of branch damper length ensures the highest effectiveness in reducing the amplitude of pressure fluctuations characterized by a given frequency.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth rate and cyclical fluctuations in transport. A simple model
Autorzy:
Dorosiewicz, S.
Tematy:
transport
dynamics
cyclical fluctuations
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Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Powiązania:
https://bibliotekanauki.pl/articles/409238.pdf  Link otwiera się w nowym oknie
Opis:
The paper contains a preliminary study of the transport market dynamics model, including its cyclical fluctuations. An additional goal is to enable a quantitative examination of the impact of transport congestion on the economic development and the effects of underinvestment in transport.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jackknife Forecasts of Time Series
Wykorzystanie metody jackknife do prognozowania szeregów czasowych
Autorzy:
Wywiał, Janusz
Żądło, Tomasz
Tematy:
jackknife
time series
seasonal fluctuations
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Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Powiązania:
https://bibliotekanauki.pl/articles/906889.pdf  Link otwiera się w nowym oknie
Opis:
In the paper we present the examples of forecasts of time series with seasonal fluctuations. Based on the jackknife method we estimate variances of seasonal factors and the MSE of prediction. Jackknife method has been introduced by M. Quenouille (1949) and then it has been developed among others by J. Tukey (1958) and J. Shao, D. Tu (1995).
W pracy zaproponowano wykorzystanie metody jackknife do prognozowania szeregów czasowych. Oprócz problemu prognozowania tą metodą, podjęto także problem oceny średniego błędu tak wyznaczanych prognoz. W oparciu o rzeczywiste dane zaprezentowane zostały przykłady prognozowania szeregów czasowych z wahaniami sezonowymi przy wykorzystaniu wersji jackknife metody wskaźników sezonowości. Oprócz wyznaczenia wartości prognozowanej w rozważanym przypadku będzie możliwa ocena wariancji błędu predykcji. Metodę jackknife wprowadził M. Quenouille (1949), a była rozwijana m. in. przez J. Tukey’a (1958) oraz J. Shao i D. Tu (1995).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluctuations and the rapidity dependence of charged particles spectra in fixed centrality bins in pA collisions
Autorzy:
Praszałowicz, Michał
McLerran, Larry
Opis:
We argue that large fluctuations in the saturation momentum are necessary to explain the ATLAS and ALICE data on p A collisions measured at the LHC. Using a form for the distribution of fluctuations motivated by theoretical studies of the non-linear evolution equations for the Color Glass Condensate, we find a remarkably good agreement between theory and the measured distributions. If the saturation momentum fluctuates, we argue that the cross section for a proton probe should also fluctuate, consistent with previous observations.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Study of the state a Francis turbine
Autorzy:
Żółtowski, M.
Żółtowski, B.
Castaneda, L.
Tematy:
FEM
Francis turbine
diagnosis
fluctuations
hydrodynamic
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Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:
https://bibliotekanauki.pl/articles/260151.pdf  Link otwiera się w nowym oknie
Opis:
This paper presents a methodology to evaluate the technical state of a Francis turbine by shaft rotor dynamic simulation. There are several rotor dynamic criteria that define the technical state of a turbo-machine. To feed the shaft rotor dynamic model this delivers the required information to accomplish the technical assessment. The numerical rotor dynamic model uses as input, the field forces obtained by the fluid-solid interaction analysis undertaken over the blades of the runner. The rotor dynamic numerical simulations allow to determinate the record-in-time of the displacements of any point along the shaft. This information is relevant for diagnosis tasks, because it is possible to decompose it spectrally and to estimate the severity of the vibrations. Comparing the results of the numerical model against those obtained from machines that operates under normal conditions, it is possible to determinate the technical state of the turbo-machine. This allows studying the stability of the turbine working on several operation ranges. A Francis turbine is a very complex machine that involves many physical phenomena of different nature. In this way, the hydraulic input forces needed by the rotor dynamic model should not be assumed but calculated directly from the fluid interaction over the turbine structure.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Are Habits in Consumption Important for the Propagation of Business Cycle Fluctuations in Bulgaria?
Autorzy:
Vasilev, Aleksandar
Tematy:
business fluctuations
internal consumption habits
Bulgaria
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/2076048.pdf  Link otwiera się w nowym oknie
Opis:
We introduce consumption habits into a real-business-cycle setup augmented with a detailed government sector. We calibrate the model to Bulgarian data for the period following the introduction of the currency board arrangement (1999- 2018). We investigate the quantitative importance of the presence of internal consumption habits motive for the propagation cyclical fluctuations in Bulgaria. Allowing for internal habits in household’s consumption improves the model performance against data, and in addition this extended setup dominates the standard RBC model framework without habits. Therefore, the computational experiments performed in this paper suggest that habits are a quantitatively important model ingredient, which should be taken into consideration when analysing the effects of different policies in Bulgaria. This result can be viewed as an empirical validation of the habit model, and a rejection of the model without habits in the case of Bulgaria. In addition, we also demonstrate that internal habits are quantitatively more important than external habits for the Bulgarian business cycle.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A survey of multiplicity fluctuations in PHENIX
Autorzy:
Mitchell, J.
Tematy:
fluctuations
multiplicity
relativistic heavy-ion collisions
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Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/148455.pdf  Link otwiera się w nowym oknie
Opis:
The PHENIX Experiment at the Relativistic Heavy Ion Collider has made measurements of event-by-event fluctuations in the charged particle multiplicity as a function of collision energy, centrality, collision species, and transverse momentum in heavy-ion collisions. The results of these measurements will be reviewed and discussed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Współczesne wahania koniunkturalne w Niemczech i w Polsce
Contemporary Fluctuation of Economic Situation in Germany and in Poland
Autorzy:
Barczyk, Ryszard
Kruszka, Michał
Tematy:
Cykl koniunkturalny, Wahania koniunkturalne, Teoria cykli koniunkturalnych, Wahania cykliczne
Business cycles, Business fluctuations, Business cycles theory, Cyclical fluctuations
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Wydawca:
Szkoła Główna Handlowa w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/500452.pdf  Link otwiera się w nowym oknie
Opis:
The processes of cyclical fluctuations occur both in market economies and in the systems under transformation. Fluctuations in the countries where transformation is in progress develop in different institutional, political and social conditions. The level of economic growth in those countries is lower and long-term changes in the sphere of ownership and in the structure of sectors play a different role. The aim of these studies is an empirical analysis of the morphology of contemporary cyclical fluctuations occurring in the German economy, which has well developed market structures, and in Poland - where profound changes of the system are in progress. The conducted empirical analysis proves that in the 1990s cyclical fluctuations occurred both in the German and in the Polish economies. The morphological features of fluctuations in the Polish economy highly resemble the properties of the growth cycle. This statement is justified by the length of the cycle, the relation between the favourable and unfovourable phase of business conditions as well as by the amplitude of the phases and the whole cycle. This may mean that business conditions processes occurring in the Polish economy result (as regards the external symptoms of the fluctuations) in the effects similar to those, which can be observed, in highly developed market economies.
Dostawca treści:
Biblioteka Nauki
Artykuł

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