Temat: inhomogeneity - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Drop break-up and coalescence in a stirred tank
Autorzy:: Podgórska, W.
Bałdyga, J.
Powiązania:: https://bibliotekanauki.pl/articles/1955731.pdf
Data publikacji:: 2003
Wydawca:: Politechnika Gdańska
Tematy:: CFD
intermittence
large-scale inhomogeneity
small-scale inhomogeneity
Opis:: It is shown in the paper that drop size distribution in liquid-liquid dispersions is affected by both the fine-scale and the large-scale inhomogeneity of turbulence. Fine-scale inhomogeneity is related to the phenomenon of local intermittency and described using a multifractal formalism. Large-scale inhomogeneity is related to inhomogeneous distributions of the locally averaged properties of turbulence, including the rate of energy dissipation and the integral scale of turbulence. Large-scale distributions of the properties of turbulence in a stirred tank are considered with a network of well-mixed zones. CFD methods are used to compute the properties of turbulence in these zones. A model taking into account inhomogeneity of both types explains the effect of the system's scale on drop size; it predicts smaller maximum stable drop sizes than the classic Kolmogorov theory of turbulence. The model predictions agree well with experimental data.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 409-424
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Interaction between edge dislocation and inhomogeneity of an arbitrary shape and properties under coupled thermomechanical strains
Autorzy:: Sun, Yang
Li, Ang
Shi, Lan
Liu, Mabao
Powiązania:: https://bibliotekanauki.pl/articles/1839691.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: thermomechanical strain
edge dislocation
inhomogeneity
Opis:: In this work, a general approximate solution for the configurational force between edge dislocation and inhomogeneity of an arbitrary shape and properties with coupled thermo- mechanical loads was developed on the basis of the Eshelby equivalent inclusion theory. The effect of temperature-dependent elastic properties, thermal expansion coefficient and yield strength on the configurational forces was analyzed. Furthermore, the configurational force considered to be the driving force for dislocation migration was innovatively used to investigate the interaction mechanism between graphene and internal defects of a metal.
Źródło:: Journal of Theoretical and Applied Mechanics; 2021, 59, 1; 121-133
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Quaternary terrestrial stratigraphic correlations between the Levant and the Circum-North Atlantic region: current knowledge and constraints
Autorzy:: Lateef, Abdul Sahib A.
Powiązania:: https://bibliotekanauki.pl/articles/2027623.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Stratigraphic correlation
paleoclimates
environmental inhomogeneity
Bekaa Valley
Opis:: Quaternary paleoclimatic signals from the Levant have been frequently correlated with the most widely used stra- s q tigraphic divisions of high latitudes. In this article, relevant data, underlying concepts and new information are critically reviewed to highlight sources of uncertainty. Comparison between four sites from the Bekaa Valley demonstrate the problem of correlations and paleoenvironmental diversity of the region.
Źródło:: Studia Quaternaria; 2003; 61-72
1641-5558
2300-0384
Pojawia się w:: Studia Quaternaria
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Inhomogeneity detection in phytoplankton time series using multivariate analyses
Autorzy:: Muniz, O.
Rodriguez, J.G.
Revilla, M.
Laza-Martinez, A.
Seoane, S.
Franco, J.
Powiązania:: https://bibliotekanauki.pl/articles/2079181.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: phytoplankton community
monitoring programme
uncertainty
multivariate analysis
inhomogeneity
Opis:: Phytoplankton communities have long been used as water quality indicators within environmental policies. This has fostered the development of national and international phytoplankton monitoring programs, but these networks are subject to sources of uncertainty due to laboratory issues. Nevertheless, studies regarding the interference associated with these aspects are not well-documented. Hence, a long time series (2003–2015) from the Basque continental shelf (southeastern Bay of Biscay) was analyzed to evaluate the uncertainty given by laboratory strategies when studying phytoplankton variability. Variability in phytoplankton communities was explained not only by environmental conditions but also by changes in fixatives (glutaraldehyde and acidic Lugol's solution) and laboratory staff. Based on Bray-Curtis distances, phytoplankton assemblages were found to be significantly dissimilar according to the effect of changes in the specialist handling the sample and the employed fixative. The pair-wise permutational multivariate analysis of variance (PERMANOVA) showed significant differences between the two fixatives utilized and also between the three taxonomists involved. Thus, laboratory-related effects should be considered in the study of phytoplankton time series.
Źródło:: Oceanologia; 2020, 62, 3; 243-254
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Investigation of Strain Inhomogeneity in Hexa-ECAP Processed AA7075
Autorzy:: Öğüt, Serkan
Kaya, Hasan
Kentli, Aykut
Özbeyaz, Kerim
Şahbaz, Mehmet
Uçar, Mehmet
Powiązania:: https://bibliotekanauki.pl/articles/2049691.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: strain inhomogeneity
Hexa-ECAP
ECAP
SPD
AA7075
Opis:: Severe Plastic Deformation (SPD) techniques have been used by researchers for last three decades in order to obtain Ultra-Fine Grained (UFG) materials. Equal Channel Angular Pressing (ECAP) is preferred more than other SPD techniques thanks to its high performance and practicability. Hexa Equal Channel Angular Pressing (Hexa-ECAP) – modified ECAP technique which enables to apply ECAP routes for cylindrical samples properly – was preferred in this study. Within the objective of this study, the effects of coefficient and ram velocity on the mean effective strain and strain inhomogeneity of Hexa-ECAP processed Al7075 aluminium alloy were investigated. Also, the effects of ram velocity and friction coefficient on hardness homogeneity were investigated benefitting from the similarity between the hardness distribution and the strain distribution.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 2; 431-436
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Recognition of anhydrite intercalated salt deposit from seismic dataset distorted by noise
Autorzy:: Kawalec-Latała, E.
Powiązania:: https://bibliotekanauki.pl/articles/178911.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: underground storage
acoustic impedance
salt deposit
inhomogeneity detection
noise
Opis:: Acoustic inversion is useful to extract information from seismic data. Inhomogeneities of salt deposits should be predicted before the decision of underground storage location is made. The work concerns the possibility of detecting anhydrite intercalation in the rock salt from seismic dataset. The resolution strongly depends on signal to noise ratio. The synthetic pseudoacoustic impedance sections are generated for efficiency test of predictive and minimum entropy deconvolution process, when random noise distorts the seismic traces.
Źródło:: Studia Geotechnica et Mechanica; 2015, 37, 3; 41-48
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Filtracja aerozoli w strukturalnie niehomogenicznych filtrach włókninowych. Część II. Doświadczalna weryfikacja modeli
Aerosol filtration in structurally inhomogeneous fibrous filters. II - Experimental validation of models
Autorzy:: Jackiewicz, A.
Podgórski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2070826.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: aerozol
filtry włókninowe
niehomogeniczność
penetracja
aerosol
fibrous filters
inhomogeneity
penetration
Opis:: Uzyskane wyniki doświadczalne porównano z przewidywaniami klasycznej teorii filtracji wgłębnej opartej o średnią arytmetyczną średnicę włókna oraz z nowo sformułowanym teoretycznym modelem filtracji w filtrach polidyspersyjnych — modelem przepływu częściowo segregowanego - uwzględniającym rzeczywisty rozkład średnic włókien. Wyznaczono stopień segregacji przepływu oraz zbadano wpływ prędkości przepływu powietrza na tenże parametr.
The experimental results were compared with predictions of the classical theory of depth filtration based on the arithmetic mean fiber diameter and with the newly formulated theoretical filtration model in polydisperse fibrous filters - the partially segregated flow model -accounting for a real fiber diameter distribution. The segregation intensity was determined and the effect of gas velocity on this parameter was checked.
Źródło:: Inżynieria i Aparatura Chemiczna; 2009, 6; 92-93
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A screw dislocation located outside, inside or on the interface of a parabolic elastic inhomogeneity
Autorzy:: Wang, X.
Schiavone, P.
Powiązania:: https://bibliotekanauki.pl/articles/38627364.pdf
Data publikacji:: 2021
Wydawca:: Instytut Podstawowych Problemów Techniki PAN
Tematy:: screw dislocation
parabolic elastic inhomogeneity
superposition
conformal mapping
analytic continuation
Opis:: Using conformal mapping techniques, superposition and analytic continuation, we derive analytic solutions to the problem of a screw dislocation interacting with a parabolic elastic inhomogeneity. The screw dislocation can be located anywhere either in the surrounding matrix or in the parabolic inhomogeneity or simply on the parabolic interface itself. We obtain explicit expressions for the two analytic functions in the image plane characterizing the elastic fields describing displacement and stresses in the two-phase composite. Using the Peach-Koehler formula, we also obtain the image force acting on the screw dislocation. The analytic function defined in the parabolic inhomogeneity in the physical plane can be interpreted in terms of real and image screw dislocations for any location of the real screw dislocation.
Źródło:: Archives of Mechanics; 2021, 73, 3; 219-235
0373-2029
Pojawia się w:: Archives of Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Filtracja aerozoli w strukturalnie niehomogenicznych filtrach włóknistych. Część I. Sformułowanie modeli
Aerosol filtration in structurally inhomogeneous fibrous filters. I - Formulation of models
Autorzy:: Podgórski, A.
Jackiewicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/2070799.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: aerozol
filtry włókninowe
niehomogeniczność
penetracja
aerosol
fibrous filters
inhomogeneity
penetration
Opis:: Analiza dostępnych danych literaturowych, jak też badania strukturalne filtrów własnej produkcji wskazują, że większość filtrów włókninowych cechuje się silnie polidyspersyjnym rozkładem średnic włókien, który zazwyczaj można dobrze aproksymować za pomocą rozkładu logarytmiczno-normalnego. Zaproponowano i rozwiązano nowe modele matematyczne pozwalające opisać penetrację cząstek aerozolowych przez takie filtry.
Analysis of the available literature data and results of structural investigations of our own-made filters indicate that majority of fibrous filters are characterized by a strong polydisperse fiber diameter distribution, which can be usually precisely approximated with the use of the log-normal one. New mathematical models allowing one to describe penetration of aerosol particles through such filters were proposed and solved.
Źródło:: Inżynieria i Aparatura Chemiczna; 2009, 6; 90-91
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Dependence of tissue inhomogeneity correction factors on photon-beam energy
Autorzy:: Akhtaruzzaman, M.
Kukolowicz, P.
Powiązania:: https://bibliotekanauki.pl/articles/148652.pdf
Data publikacji:: 2018
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: Batho method
dose calculation
inhomogeneity correction factors
photon-beam energy
Opis:: Introduction: Commissioning of the treatment-planning system includes the accuracy of dose calculations in the inhomogeneous absorber. Several results of measurements with regard to inhomogeneity correction factors (CFs) have been published. However, the dependence of CFs on photon-beam energy may preclude such results from being applied to the photon beams of general users. Purpose: The aim of this study was to assess the dependence of CFs on the photon-beam energy. Materials and methods: CFs were calculated by the Batho method for several slab geometries comprised of concentrations of lung tissue and water of 0.25 and 1.00 g/cm3, respectively. The CFs were calculated at 6 MV (TPR10 = 0.67 ± k * 0.01) and 15 MV (TPR10 = 0.76 ± k * 0.01) where k = –3, –2, –1, 0, 1, 2, 3. All calculations were performed in the region where a charged-particle equilibrium exists. Results: Changes in CFs of less than 2% were observed across the considered energy ranges. With a change in TPR20,10 of 0.01, both at 6 and 15 MV at a depth of 5 cm below the lung; and lung thicknesses of 3, 5 and 8 cm over a fi eld surface area of 10 × 10 cm2, the change in CF never exceeded 2.4%. The dependences of changes in CFs in terms of TPR20,10 were 1.74% and 1.20% for fi eld surface areas of 5 × 5 cm2 and 20 × 20 cm2, respectively. A comparison of 42 linear accelerators (LINACs) exhibiting 6 MV and 15 MV of energy installed in Poland showed that the maximum differences in terms of TPR20,10 at 6 MV and 15 MV were 4.2% and 2.2%, respectively. Conclusion: A linear dependence of CFs on energy was observed. According to observations, the smaller the surface area of the fi eld and deeper the point of interest below the lung, the more dependent CFs are on energy.
Źródło:: Nukleonika; 2018, 63, 1; 3-7
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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