Temat: mean flow - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Numerical characterization of an axisymmetric lined duct with flow using the multimodal scattering matrix
Numeryczna charakteryzacja wyściełanego przewodu osiowo-symetrycznego z przepływem za pomocą wielomodalnej macierzy rozpraszania
Autorzy:: Taktak, M.
Majdoub, M. A.
Haddar, M.
Bentahar, M.
Tematy:: lined duct
scattering matrix
mean flow; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281218.pdf Link otwiera się w nowym oknie
Opis:: In this paper, the development of a numerical method to compute the multimodal scattering matrix of a lined duct in the presence of flow is presented. This method is based on the use of the convected Helmholtz equation and the addition of modal pressures at duct boundaries as additional degrees of freedom of the system. The boundary effects at the inlet and outlet of the finite waveguide are neglected. The choice of this matrix is justified by the fact that it represents an intrinsic characterization of a duct system. The validation of the proposed finite element is done by a comparison with the analytical formulation for simple cases of ducts. Then, the numerical coefficients of the scattering matrix of a lined duct and its acoustic power attenuation are computed for several flow velocities to evaluate the flow effect.
W pracy zaprezentowano numeryczną metodę wyznaczania macierzy rozpraszania dla wyściełanego przewodu z uwzględnieniem wewnętrznego przepływu czynnika. Metodę oparto na zastosowaniu równania konwekcji Helmholtza z wprowadzeniem ciśnień modalnych na brzegach jako dodatkowych stopni swobody układu. Efekty brzegowe na wlocie i wylocie przewodu falowego o skończonej długości pominięto. Wybór macierzy rozpraszania uzasadniono faktem, że reprezentuje ona wewnętrzną charakterystykę analizowanego modelu. Zaproponowany element skończony zweryfikowano poprzez porównanie z istniejącymi rozwiązaniami analitycznymi dla prostych przypadków konfiguracji przewodu. Następnie numerycznie obliczono wartości elementów macierzy rozpraszania oraz współczynniki tłumienia akustycznego dla kilku prędkości przepływu w celu określenia, jak dalece wpływa on na badany układ.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Scheduling of Flowshop Type Production with Dannenbring Method to Obtain Optimal Results with Observing Waiting Time and Weight of Jobs
Autorzy:: Rahmani, Ulfa
Wulan, Elis Ratna
Huda, Arief Fatchul
Supian, Sudradjat
Subiyanto, Subiyanto
Tematy:: Linear Programming
Makespan
Weigted Mean Flow Time; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1062846.pdf Link otwiera się w nowym oknie
Opis:: Linear programming is a step or process to get maximum results with existing resources or it can be said the process of looking for optimal value. One part of scheduling is production scheduling. production scheduling is the use of resources that are few but make the most profit. This paper discusses production scheduling using flowshop type production scheduling by taking into account transportation times and work weights. This paper uses the Dannenbring method with the aim of finding the optimal sequence of problems by considering the total production time (makespan) and the average Weigted Mean Flow Time (WMFT). Based on the results of the Dannenbring method, the results of flowshop scheduling are obtained with a total makespan of 75 hours and the WMFT value is 28, 87 hours.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Flowshop scheduling with respect to transport time, break-time and weight of jobs using Nawaz, Enscor and Ham (NEH) methods
Autorzy:: Bahari, Muhammad Faudzi
Wulan, Elis Ratna
Huda, Arief Fatchul
Supian, Sudradjat
Subiyanto, Subiyanto
Tematy:: Flowshop
Makespan
NEH
Scheduling
Weighted Mean Flow Time; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1177485.pdf Link otwiera się w nowym oknie
Opis:: This research discusses a production scheduling by using flowshop type production scheduling with respect to transportation time, break-time and weight of jobs. The data used are four job scheduling on three machines. In addition, there is inter-machine transport time. The method was used in this research is NEH Method. Based on the results, the NEH method obtained a makespan value of 56 hours with a weighted mean flow time of 34.07 hours.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical Modelling of the Acoustic Pressure Inside an Axisymmetric Lined Flow Duct
Autorzy:: Taktak, M.
Majdoub, M. A.
Bentahar, M.
Haddar, M.
Tematy:: lined duct
mean flow
finite element method
axisymmetric duct; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177750.pdf Link otwiera się w nowym oknie
Opis:: Numerical methods are mostly used to predict the acoustic pressure inside duct systems. In this paper, the development of a numerical method based on the convected Helmholtz equation to compute the acoustic pressure inside an axisymmetric duct is presented. A validation of the proposed method was done by a comparison with the analytical formulation for simple cases of hard wall and lined ducts. The effect of the flow on the acoustic pressure inside these ducts was then evaluated by computing this field with different Mach numbers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A Mean-Line Flow Model of Viscous Liquids in a Vortex Pump
Autorzy:: Li, Wenguang
Tematy:: vortex pump
mean-line flow model
viscosity
slip factor
incidence
deviation angle; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/2197525.pdf Link otwiera się w nowym oknie
Opis:: The axial, radial and tangential velocity profiles of six fluids were extracted from computational fluid dynamics simulation results at points in a pump chamber 1 mm distant from the blades in a vortex pump at the specific speed of 76. The critical radius was specified in the axial velocity radial profiles to determine the impeller inlet and outlet at six viscosities and part-load, design, and over-load points. A mean-line flow model and hydraulic loss model were built from the profiles. The incidence, incidence loss in the inlet, deviation angle, and slip factor in the outlet were calculated. The impeller theoretical head, pump hydraulic efficiency and volumetric efficiency were analyzed. It was shown that the axial, radial and tangential velocity profiles relate closely to the flow rate as usual, but also the viscosity, especially at low flow rates and in the inlet. The low flow rate and viscosity lead to near zero axial and radial velocities, a faster tangential velocity than the blade speed, negative incidence, and a small incidence loss coefficient in the inlet. The dimensionless critical radius ranged within 0.77–0.89 and reduces with the increasing flow rate and viscosity. The mean slip factor is between 0.11 and 0.20 and rises with the increasing flow rate and viscosity. The mean incidence loss coefficient is within 0.0020–0.15 and augments with the increasing flow rate but increases with the decreasing viscosity under part-load conditions. The theoretical head estimated by using the fluid tangential velocity between the outlet of the impeller and the inlet of the chamber is more reasonable.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of the Hydraulic Load of a Local WWTP in the South-Eastern Poland Including Hydraulic Capacity of the Sewage Receiver
Autorzy:: Młyńska, Anna
Młyński, Dariusz
Chmielowski, Krzysztof
Tematy:: hydraulic load
sewage
sewage receiver
sewage outflow
mean low flow
SNQ
wastewater treatment plant
WWTP; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/2202274.pdf Link otwiera się w nowym oknie
Opis:: The paper constitutes the analysis of hydraulic load of a local wastewater treatment plant in the south-eastern Poland along with the analysis of sewage receiver hydraulic capacity and related receiving waters protection. Assuming that the daily outflow of treated sewage should not exceed 10% of the mean-low flow (SNQ) of the receiver, no case of daily sewage outflow greater than 10%·SNQ = 51 840 m3·d-1 was recorded. Moreover, average daily hydraulic load of the treatment plant was lower than the limit value by over 70% and the maximum recorded value – by over 40%. Furthermore, the conducted analysis shows that the particular months differed from each other in the values of the daily hydraulic load of the wastewater treatment plant at the outflow; May was the month with the highest average daily sewage outflow, while September was characterized by the lowest average daily outflow of treated sewage. There was also no clear dependence between the hydraulic load of the WWTP and the day of the week. Daily sewage outflows ranging from 10 000 m3·d-1 to 12 000 m3·d-1 constituted the largest part of all observations. The daily sewage outflows directed to the receiver prove that there is no threat to the preservation of the water environment quality.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Heteroskedasticity in excess Bitcoin return data: Google trend vs. GARCH effects
Autorzy:: Senarathne, Chamil W.
Šoja, Tijana
Tematy:: Bitcoin
information flow
GARCH-in-Mean
GARCH effects
Google trend; Pokaż więcej
Wydawca:: Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Powiązania:: https://bibliotekanauki.pl/articles/947712.pdf Link otwiera się w nowym oknie
Opis:: This paper examines the mixture of distribution properties associated with heteroskedastic excess Bitcoin return data, using the volume of Google search queries as a proxy for the information arrival time, from a monthly data sampling period of June 2010 to May 2019. The results show that the volatility coefficients become highly statistically insignificant when the lagged volume of search queries is included in the conditional variance equation of the GJR-GARCH-M model. This clearly suggests that the volume of search queries is shown to provide significant explanatory power regarding the variance of heteroskedastic excess Bitcoin return, which can be traced from the ARCH process defined in the GJR-GARCH-M specification. A significant negative relationship between the conditional volatility and the volume of search queries indicates that Internet (online) information arrival reduces the risk premium in the Bitcoin market, which may improve market stability.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Flow cytometric characteristics of alveolar lymphocytes (AL) obtained from the control group : proposal of normal value range of AL subsets in nonsmokers
Autorzy:: Szczeklik, Jerzy
Sładek, Krzysztof
Nalepa, Piotr
Szlubowski, Artur
Soja, Jerzy
Lackowska, Bożena
Jedynak-Wąsowicz, Urszula
Kopiński, Piotr
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: About Robust Estimators of Average Shape and Variance of Shape
O odpornych estymatorach przeciętnego kształtu i wariancji kształtu
Autorzy:: Kosiorowski, Daniel
Tematy:: procrustes analysis
procrustes mean
variance of shape estimator
projection depth
capital flow; Pokaż więcej
Wydawca:: Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Powiązania:: https://bibliotekanauki.pl/articles/905056.pdf Link otwiera się w nowym oknie
Opis:: In this paper we investigate whether in the statistical inference for shapes of economic systems it is useful to modify least squares methods (commonly used Procrustes approach) by applying data depth concept. In the paper theoretical considerations are illustrated with examples of multidimensional financial time series.
W artykule badamy czy w zagadnieniach wnioskowania statystycznego odnośnie do kształtów układów ekonomicznych użytecznym jest zmodyfikować estymatory najmniejszych kwadratów (powszechnie wykorzystywaną metodę Prokrusta) przez zastosowanie metod koncepcji głębi danych. W artykule rozważania teoretyczne ilustrujemy przykładami dotyczącymi finansowych wielowymiarowych szeregów czasowych.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u
Autorzy:: Łukasik, J.
Lynch, W.G.
Sochocka, Anna
Isobe, T.
Brzychczyk, Janusz
Boretzky, K.
Baba, H.
Ikeno, N.
Chiga, N.
Simon, H.
Kim, Y.J.
Fukuda, N.
Atar, L.
Ieki, K.
Lasko, Paweł
Sumikama, T.
Suzuki, D.
Kurata-Nishimura, M.
Nakamura, T.
Nishimura, S.
Jhang, G.
Lee, J.W.
Törnqvist, H.
Kondo, Y.
Lee, H.S.
Otsu, H.
Santamaria, C.
Snoch, A.
Sakurai, H.
Shimizu, Y.
Cerizza, G.
Horvat, A.
Ahn, D.S.
Gasparic, I.
Nakatsuka, N.
Inabe, N.
Kobayashi, T.
Morfouace, P.
Pawłowski, P.
Pelczar, Krzysztof
Sato, H.
Rossi, D.
Togano, Y.
Tangwancharoen, S.
Aumann, T.
Leifels, Y.
Barney, J.
Takeda, H.
Murakami, T.
Yennello, S.J.
Estee, J.
Shane, R.
Kaneko, M.
Wang, R.
Hong, B.
Xiao, Z.G.
Scheit, H.
Tsang, C.Y.
Ono, A.
Manfredi, J.
Tsang, M.B.
McIntosh, A.B.
Zhang, Y.
Suzuki, H.
Opis:: Radioactive tin beams were used to explore the flow observables under varying isospin asymmetries while maintaining a constant total charge. The rapidity dependence of directed flow (v$_{1}$) and elliptic flow (v$_{2}$) was studied for protons, deuterons, tritons, $^{3}$He, and $^{4}$He, produced in neutron-rich $^{132}$Sn + $^{124}$Sn and neutron-deficient $^{108}$Sn + $^{112}$Sn collisions at 270 MeV / nucleon. In general, heavier particles exhibited larger v$_{1}$ and v$_{2}$ values. The experimental data was used to test transport models which simulate heavy ion collisions. Specifically, comparisons were made with Antisymmetrized Molecular Dynamics (AMD) model calculations, which explicitly account for cluster correlations. Two types of momentum-dependent mean field potentials were tested. The results reveal that both v$_{1}$ and v$_{2}$ values are enhanced when the mean field incorporates stronger momentum dependence. In addition, v$_{2}$ exhibits larger sensitivity to symmetry energy than v$_{1}$ but the overall sensitivity to symmetry energy is low. In an attempt to describe the data, different parameter sets have been tried. Most describe either the hydrogen flow or helium flow reasonably well but none describes the flow of all particles simultaneously.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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