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Wyświetlanie 1-15 z 749
Tytuł:
Some remarks on positron/positronium diffusion models
Autorzy:
Świątkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/148428.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
diffusion
diffusion length
positron
positronium
Opis:
Positrons thermalized near the sample boundary (as well as Ps atoms formed in the sample) can reach the boundary as a result of diffusive movement. Observations of such effects as positron reemission or positron surface trapping as well as positronium emission allow one to calculate respective diffusion lengths. From the presented analysis it follows that some models used in such calculations give quite wrong results.
Źródło:
Nukleonika; 2003, 48, 3; 141-144
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffusion Path in Ternary One-Phase Systems: An Overview
Autorzy:
Serafin, D.
Nowak, W. J.
Wierzba, P.
Wędrychowicz, S.
Wierzba, Bartek
Powiązania:
https://bibliotekanauki.pl/articles/175705.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inter-diffusion
up-hill diffusion
diffusion path
Opis:
In this article, the fundamental questions concerning the diffusion path, in particular, what is the shape of diffusion path in ternary systems and how to approximate it from the initial concentration profile, will be answered. The new rules were found which allow for determining the diffusion path from a known initial concentration of the components. This approximation will allow for designing new materials without a time-consuming numerical simulation of the full system of equations. It is shown that the difference in intrinsic diffusion coefficients determines the up-hill diffusion.
Źródło:
Advances in Manufacturing Science and Technology; 2020, 44, 1; 1-8
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reaction-diffusion coupled inclusions with variable exponents and large diffusion
Autorzy:
Simsen, Jacson
Stefanello Simsen, Mariza
Wittbold, Petra
Powiązania:
https://bibliotekanauki.pl/articles/2052022.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
reaction-diffusion coupled systems
variable exponents
attractors
upper semicontinuity
large diffusion
Opis:
This work concerns the study of asymptotic behavior of coupled systems of p(x)-Laplacian differential inclusions. We obtain that the generalized semiflow generated by the coupled system has a global attractor, we prove continuity of the solutions with respect to initial conditions and a triple of parameters and we prove upper semicontinuity of a family of global attractors for reaction-diffusion systems with spatially variable exponents when the exponents go to constants greater than 2 in the topology of [formula] and the diffusion coefficients go to infinity.
Źródło:
Opuscula Mathematica; 2021, 41, 4; 539-570
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strangely sweeping one-dimensional diffusion
Autorzy:
Rudnicki, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/1311888.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
diffusion process
parabolic equation
Opis:
Let X(t) be a diffusion process satisfying the stochastic differential equation dX(t) = a(X(t))dW(t) + b(X(t))dt. We analyse the asymptotic behaviour of p(t) = Prob{X(t) ≥ 0} as t → ∞ and construct an equation such that $lim sup_{t→∞} t^{-1} ∫_0^t p(s) ds = 1$ and $lim inf_{t→∞}t^{-1} ∫_0^t p(s) ds = 0$.
Źródło:
Annales Polonici Mathematici; 1993, 58, 1; 37-45
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffusion in Networks
Autorzy:
Kasprzak, R.
Powiązania:
https://bibliotekanauki.pl/articles/309179.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
complex network
diffusion
probabilistic finitestate machine
Opis:
In this paper a concept of method and its application examining a dynamic of diffusion processes in networks is considered. Presented method was used as a core framework for system CARE (Creative Application to Remedy Epidemics).
Źródło:
Journal of Telecommunications and Information Technology; 2012, 2; 99-106
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous and traditional diffusion modelling in SOM learning
Autorzy:
Hrebik, Radek
Kukal, Jaromir
Powiązania:
https://bibliotekanauki.pl/articles/949793.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
self organization
Kohonen map
diffusion learning
anomalous diffusion
SOM
Opis:
The traditional self organizing map (SOM) is learned by Kohonen learning. The main disadvantage of this approach is in epoch based learning when the radius and rate of learning are decreasing functions of epoch index. The aim of study is to demonstrate advantages of diffusive learning in single epoch learning and other cases for both traditional and anomalous diffusion models. We also discuss the differences between traditional and anomalous learning in models and in quality of obtained SOM. The anomalous diffusion model leads to less accurate SOM which is in accordance to biological assumptions of normal diffusive processes in living nervous system. But the traditional Kohonen learning has been overperformed by novel diffusive learning approaches.
Źródło:
Archives of Control Sciences; 2019, 29, 4; 699-717
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffusion of lead ions trough the Poznan Clay (Neogene) and through glacial clay
Autorzy:
Mieszkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2059620.pdf
Data publikacji:
2003
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
apparent diffusion coefficient
diffusion in clays
Fick's Law
Opis:
Two main kinds of migration through clays can be distinguished: advection and diffusion. The main force for advective flow is the water pressure gradient, while ionic concentration gradients drive diffusion. In compacted clays the hydraulic permeability is very low, therefore the diffusion process predominates. Clays can be considered as waste repositories. This paper shows characteristics of the diffusion process and the application of this process to modelling of waste migration in clays. Additionally, a new calculation method for the apparent diffusion coefficient using the finite-difference method is given. Experimental, values of the apparent diffusion coefficient Dapp for Poznan Clay and glacial clay are respectively 2.2_2.6 _ 10-12 m2/s and 2.6_4.4 _ 10-12 m2/s.
Źródło:
Geological Quarterly; 2003, 47, 1; 111-118
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotic dissipativity of the diffusion process in the asymptotic small diffusion scheme
Autorzy:
Kinash, A.
Chabanyuk, Y.
Khimka, U.
Powiązania:
https://bibliotekanauki.pl/articles/122512.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
small series parameter
diffusion
asymptotic dissipativity
Opis:
This paper considers the random evolution with Markov switching. The resulting limited process is diffusion and depends on the small series parameter. The sufficient conditions of dissipativity of the limited process were obtained. Since the conditions of the Model Limit theorem and dissipativity conditions were set asymptotic dissipativity of the output process.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 4; 93-103
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innovation Diffusion in the Supply Chain
Autorzy:
Laskowska-Rutkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/409597.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
innovation diffusion
model
supply chain
Opis:
Professional literature has not devoted too much attention to innovation diffusion in the supply chain. Specificity of innovation in supply chains also lacks relevant classification. The aim of this paper is to fill this gap by suggesting classification of innovation adjusted to specificity of supply chains and to describe the model of innovation diffusion in the supply chain. In order to verify the model of innovation diffusion in the supply chain, the following research methods were used: literature research, case description and instrumental case study. These are qualitative methods, often applied in theories of management. There were presented two instrumental descriptions of cases, being an effect of literature research and four descriptions of cases, being based on descriptions of innovative solutions in the logistics, submitted to the Polish contest titled "Innovative Solutions for the Logistics" in 2011. The research hypothesis, which is the model of innovation diffusion in the supply chain, has only been partly validated. As a result, the model of innovation diffusion in the supply chain requires further research, with the aim of the confirmation or the falsification.
Źródło:
Research in Logistics & Production; 2015, 5, 3; 287-297
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Singlet oxygen lifetime and diffusion measurements
Autorzy:
Ożog, Łukasz
Aebisher, David
Powiązania:
https://bibliotekanauki.pl/articles/454834.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
photodynamic therapy
singlet oxygen
diffusion
Opis:
Introduction. Photodynamic therapy (PDT) is considered to be a promising antitumor methodology due the cytotoxicity of singlet oxygen (1 O2 ). Aim. To present singlet oxygen which is highly reactive and decomposes to the ground state rapidly. Material and methods. Analysis of literature. Results. This review presents techniques to measure lifetime and diffusion of 1 O2.
Źródło:
European Journal of Clinical and Experimental Medicine; 2018, 2; 123-126
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interface Diffusion Behavior of Co40Al-X (X = Ni, Cr, Ti) System by Diffusion Multiple
Autorzy:
Shang, Hang
Gao, Qiuzhi
Jiang, Yujiao
Ma, Qingshuang
Li, Huijun
Zhang, Hailian
Powiązania:
https://bibliotekanauki.pl/articles/2203747.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Co-Al-X system
diffusion multiple
interface
diffusion
mechanical properties
Opis:
Diffusion multiple method was applied to investigate the alloying elements distribution and interface diffusion reactions in Co-Al-X system, in order to accelerate the alloy development. The diffusion regions of Co-Al-X system at 1173 K were investigated by scanning electron microscope (SEM) and nanoindentation. SEM images show that phases of Co-Al-Ni diffusion interface consisted of β-CoAl + γ Co, γ Co, γ + γ'-(Co, Ni)3Al and γ Ni, while Co-Al-Cr diffusion interface is shaped with δ + γ + β, γ and σ region. TiNiX diffusion layer with high Ni-content was formed in Co-Al-Ti diffusion interface. The diffusion layers during diffusion multiple play an important role in mechanical properties in these alloying systems. The γ + γ' diffusion layer in Co-Al-Ni diffusion interface presented the best comprehensive performance, while the highest hardness (17.48 GPa) was confirmed in Co-Al-Cr diffusion interface due to a large number of brittle phases. Darken method was applied to determine the interdiffusion coefficients of alloying elements in pseudo-binary phase, accordingly the diffusion capacities of alloying elements can be ordered as Al > Ni > Cr in Co-based alloys.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 275--286
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alternative methodology to determine effective coefficient of methane diffusion in coal
Autorzy:
Koptoń, Henryk
Powiązania:
https://bibliotekanauki.pl/articles/1839042.pdf
Data publikacji:
2020
Wydawca:
Główny Instytut Górnictwa
Tematy:
mining
coal
sorption
diffusion
methane
diffusion coefficient
górnictwo
węgiel
sorpcja
dyfuzja
metan
współczynnik dyfuzji
Opis:
The article presents the results of research in to the development of an alternative method of determining the effective coefficient of methane diffusion in coal, based on a mathematical model following Fick's second law. The research was conducted based on the recorded courses of methane sorption kinetics in coal samples obtained in laboratory conditions with the precise gravimetric sorption system IGA-001. The value of the coefficient was treated as an element tuning the model in such a way that the average relative error of the ex post was as small as possible. Model verification indicated the correctness of its assumptions. The development of a more accurate methodology to determine the effective coefficient of methane diffusion in coal will enable the verification of the models applied in order to describe the physical and chemical mechanisms of the methane desorption natural phenomenon. It will also pave the way for further research aimed at the determination of: the gas bearing capacity of coal seams, the degree of degassing of seamswhich results from the mining operations being conducted; or to what extent it is possible to degas the deposits.
Źródło:
Journal of Sustainable Mining; 2020, 19, 2; 88-95
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the possibility of shaping the sound diffusion coefficient of diffusers based on acoustic metamaterials
Autorzy:
Rubacha, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2202416.pdf
Data publikacji:
2022
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
metamaterial
sound diffusion
diffusion coefficient
metamateriał
dyfuzja dźwięku
współczynnik dyfuzji
Opis:
The article presents the analysis of the possibilities of using acoustic metamaterial to build sound diffusers. The diffusers composed of slots loaded with a curved quarter-wave resonator were investigated. Such solutions induce dispersion and the slow sound effect to increase the effective depth of the quarter-wave resonator. The sound diffusion coefficient was calculated with the use of numerical models of diffusers. Next, obtained results were compared with the Schroeder diffuser. In conclusion, it was shown, that acoustic metamaterials affect the frequency band of the diffuser and the effectiveness of the obtained sound diffusers depend on relative width of slits.
Źródło:
Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022210
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of heat diffusion in composites
Autorzy:
Bondyra, A.
Powiązania:
https://bibliotekanauki.pl/articles/243729.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
finite element method
glass reinforced composites
heat diffusion
fire
Opis:
Composites structures are widely using in varied fields of industry, where it has to take into account changes of temperature or it is possibility of fire hazards. Heat transfer and fire conditions in composites are very often analysis issues nowadays. A large amount of research in area of modelling heat transfer and fire loading of composites has been performed for both experimental studies and modelling and simulation. The most common areas of analysis of thermal composite structures are: multiscale modelling of heat transfer, simultaneous fire and mechanical loading, fire involved failure and temperature distribution under fire and elevated temperature conditions. This paper presents analysis of heat transfer in composites with taking into account their shape and thickness. The models include a convection mode of heat transfer. The first composite plate is 10 cm wide by 10 cm tall with a thickness of 1 cm. The modified structure has also second part, smaller plate on top 5 cm wide by 5 cm in right corner. They made of glass/vinylester composite. The plates are heating in one, two and three directions. The results are shown in forms of contours of temperature distribution and thermal gradient. Comparison of results for the modelled structures shows differences in the shape and thickness of the analysed structure.
Źródło:
Journal of KONES; 2013, 20, 3; 63-69
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Mass Diffusion Transfer in Solids Using Heat Transfer Similarities
Autorzy:
Jaber, Samar
Alahmer, Ali
Borowski, Gabriel
Alsaqoor, Sameh
Powiązania:
https://bibliotekanauki.pl/articles/957972.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
diffusion transfer
Fick's Law
diffusion resistance
transfer dyfuzyjny
prawo Ficka
opór dyfuzyjny
Opis:
A new concept of solid-solid mass diffusion fin was introduced in this paper. The authors described the mass diffusion in fluid flows to analyze the transfer process in solids and its applications, especially in metallurgical research. Using the advantage of the similarity between heat transfer and mass diffusion transfer will make this issue more practical. The authors suggested a new approach to determine the maximum mass diffusion transfer between two solids by implementing of the extended surface on each solid, where the optimal mass diffusion between solids is required. Then, meshing the surfaces together in order to increase the transfer efficiency was carried out. A complete analysis of the extended surfaces design (diffusion fins), its efficiency and effectiveness were presented. Moreover, mathematical models of each consideration were constructed. The authors found that the total surface efficiency increased along with the number of mass diffusion fins attached to the base, but its effectiveness did not. The mass diffusion for an extended plate increased the total mass diffusion transfer between two materials.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 4; 54-59
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 749

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