Skocz do pozycji: 1.

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

/5

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Skocz do pozycji: 2.

Tytuł:

On the structure of the diffusion distance induced by the fractional dyadic Laplacian

Autorzy:

Acosta, María Florencia
Aimar, Hugo
Gómez, Ivana
Morana, Federico

Powiązania:

https://bibliotekanauki.pl/articles/29519486.pdf

Data publikacji:

2024

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

diffusion metrics
dyadic diffusion

Opis:

In this note we explore the structure of the diffusion metric of Coifman-Lafon determined by fractional dyadic Laplacians. The main result is that, for each t > 0, the diffusion metric is a function of the dyadic distance, given in $ \mathbb{R}^+ $ by δ(x, y) = inf {|I| : I is a dyadic interval containing x and y}. Even if these functions of δ are not equivalent to δ, the families of balls are the same, to wit, the dyadic intervals.

Źródło:

Opuscula Mathematica; 2024, 44, 2; 157-165
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

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

/5

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Skocz do pozycji: 4.

Tytuł:

Inverse Model for the Solute Micro-Field Formation during Self-Propagating High Temperature Reaction

Autorzy:

Wołczyński, W.

Powiązania:

https://bibliotekanauki.pl/articles/351234.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

diffusion equation
diffusion barrier
self-propagating synthesis

Opis:

A new thermodynamic description for the self-propagating high temperature synthesis (SHS - reaction) is presented in the “inverse” version. This description is worked out for the diffusion barrier, thickness of which is at the limit, i.e. its value is infinitesimally small. The solution to the diffusion equation delivered in the description can be easily extended for the diffusion barrier of a greater thickness. The Ni/Al multi-layers system is treated as a virtual eutectic alloy solidifying with the rate equal to that involved by the self-propagating reaction. It is suggested to inverse the curves obtained for solidification in order to characterize the melting completed by the formation of the AlNi - intermetallic phase required in the self-propagating synthesis.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 141-147
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Contribution of diffusion weighted MRI to the differential diagnosis of renal masses

Autorzy:

Kış, Naciye
Gülden Düzkalır, Hanife
Oğuzhan Ağaçlı, Mehmet
Erok, Berrin
Gamze Kılıçoğlu, Zeynep

Powiązania:

https://bibliotekanauki.pl/articles/2049180.pdf

Data publikacji:

2022-03-30

Wydawca:

Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego

Tematy:

apparent diffusion coefficient
diffusion weighted imaging
renal neoplasms

Opis:

Introduction and aim. We aimed to assess the usefulness of diffusion weighted imaging (DWI) and apparent diffusion coefficients (ADCs) for characterizing renal masses. Material and methods. In this retrospective study we measured the ADC values of renal masses at b=0, b=500 and b=1000. Measurements were made by placing a circular region of interest with a diameter of 1 cm. ADC values from normal renal parenchyma were taken to define the ADC and to compare with the ADC values of the lesions. Results. A total of 72 lesions of 54 patients were included.40 of the masses were benign and 32 were malignant. The ADC values of benign lesions at both b values were significantly higher than malignant lesions. We found the lowest values in angiomyolipomas (AMLs) and oncocytomas and the highest values in Bosniac type I cysts. Similarities was found between the ADC values of some AMLs and the RCCs. In terms of statistical results, the inclusion of AMLs in the analysis did not significantly affect the difference between malignant and benign lesions. Conclusion. In our study, the ADC values of benign renal masses were higher than those of normal renal parenchyme, which is higher than those of malignant renal masses.The lowest ADC values were observed in AMLs and oncocytomas.

Źródło:

European Journal of Clinical and Experimental Medicine; 2022, 1; 44-48
2544-2406
2544-1361

Pojawia się w:

European Journal of Clinical and Experimental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

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

/5

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Skocz do pozycji: 7.

Tytuł:

Innovations in management accounting at the turn of the 20th and 21st century

Autorzy:

Wnuk-Pel, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/658132.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

management accounting
innovations
diffusion
activity-based costing diffusion

Opis:

Diffusion of innovative management accounting methods constitutes an incredibly interesting and a widely presented subject in literature all over the world. In the context of significance of innovative management accounting methods diffusion, the following objective of the article has been formulated – the article aims to analyze the concept of innovations in management accounting and analyze their significance and diffusion at the turn of the 20th and 21st century. In order to reach the aim, an analysis of the concept of management accounting innovations has been attempted; attention has been paid to the fact that the innovations are delayed when compared to technical innovations, the results of the delay have also been presented. Analysis of findings of the research on the use of innovative methods such as ABC/M, BSC, TQM and analysis of methods of company and individual employees’ performance evaluation has been made.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 257
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Diffusion weighted imaging in differentiation of the clear cell RCC from the major non-clear cell RCC subtypes

Autorzy:

Kış, Naciye
Erok, Berrin

Powiązania:

https://bibliotekanauki.pl/articles/2040173.pdf

Data publikacji:

2021-09-30

Wydawca:

Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego

Tematy:

apparent diffusion coefficient
diffusion weighted imaging
renal cell carcinoma

Opis:

Introduction. Renal cell carcinoma (RCC) is the most common malignant renal tumor in adults accounting for 80-90% of primary malignant adult renal neoplasms. RCC represents a very heterogenous groups of tumors with a number of distinct histological varieties, of which the major 3 subtypes are clear cell RCC (70-80%), papillary RCC (13-20%), and chromophobe RCC (5%). Imaging features are varied from solid and relatively homogenous appearance to markedly heterogenous appearance with cystic changes, hemorrhage and necrosis. The use of diffusion weighted imaging (DWI) for RCC subtyping and also for differentiation of high grade and low grade tumors has been showed to be useful in many studies in the literature. Aim. In this study, we aimed to determine the comparative contribution of DWI in differentiation of the clear cell RCC from the major non-clear cell RCC subtypes at standard high b-value (1000 s/mm2) versus low b-value (500 s/mm2). In addition, we also aimed to assess the diagnostic performance of DWI for differentiating high grade clear cell RCC from low grade clear cell RCC based on Fuhrman grades in our patients. Material and methods. 62 cases with a prediagnosis of RCC according to MRI findings including DWI sequence with histological verification and subtyping of renal cortical tumor following a total or partial nephrectomy were included in the study. Results. Among 62 cases, 46 were male and 16 were female, with mean age of 59.5±15.7. Pathological diagnoses of 62 cases were as follows, clear cell RCC, (44) papillary cell RCC (14) and chromophobe cell RCC (4). They were divided into two groups as clear cell RCC group (44 cases) and non-clear cell RCC group (18 cases). There was no statistically significant difference between the mean ADC values of clear cell and non-clear cell groups at b-value of 1000 s/mm2 (p>0.05). However, the mean ADC level for clear cell RCC group at b-value of 500 s/mm2 were significantly higher than for non-clear cell RCC group (p<0.05). When a value of 0.99x10-3 mm2/s was set as cut-off for ADC at b-factor of 500 s/mm2, differentiation was achieved with a high sensitivity (91%) and specificity (56%). Regarding the diagnostic performance of DWI for differentiating high from low Fuhrman grades clear cell RCCs, there was no statistically significant difference between the ADC values of Grade I-II clear cell RCC cases and Grade III-IV clear cell RCC cases at b-factor of 1000 s/mm2 (p>0.05). However, ADC values for grade III-IV group was statistically significantly lower than ADC values for Grade I-II group at b-factor of 500 s/mm2 level. Conclusion. ADC measurements at moderate b-value of 500 s/mm2 were more sensitive in subtyping and grading of RCC cases. This technique can be used in clinical practice as a fast and additional sequence in abdominal MRI.

Źródło:

European Journal of Clinical and Experimental Medicine; 2021, 3; 215-220
2544-2406
2544-1361

Pojawia się w:

European Journal of Clinical and Experimental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

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

/5

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Skocz do pozycji: 10.

Tytuł:

Mechanizmy dyfuzji wiedzy w regionie
The mechanisms of knowledge diffusion in the region

Autorzy:

Fic, Maria

Powiązania:

https://bibliotekanauki.pl/articles/534358.pdf

Data publikacji:

2011-12-15

Wydawca:

Uniwersytet Rzeszowski. Wydział Ekonomii

Tematy:

knowledge
diffusion
region

Opis:

The aim of the article is to present mechanisms of knowledge diffusion in the region. The authors discuss methods of aquisition of knowledge by agents functioning in the region, and channels of knowledge distribution - private persons' and public channels, institutional channels and channels based on information and communication systems. They show also the role of knowledge diffusion in the process of knowledge management in the region.

Źródło:

Przedsiębiorstwo i Region; 2011, 3; 16-23
2080-458X

Pojawia się w:

Przedsiębiorstwo i Region

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Home as a mixture of spaces during the COVID-19 pandemic: The case of migrant families in Poland

Autorzy:

Popyk, Anzhela

Powiązania:

https://bibliotekanauki.pl/articles/2053526.pdf

Data publikacji:

2021-09-28

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

home
social diffusion
diffusion of spaces
migrant family
COVID-19

Opis:

The spread of the coronavirus has led to significant modifications in the majority of social and private institutions. For most families, home is now the location of many activities that are usually kept separate, such as work, school, entertainment, and socialising. Migrant families, for whom the school was the primary place for socialising, were forced to “host” school at home. As a result, migrant families’ homes have been reconstructed from a private household and intimate dwelling place into a mixture of spaces. This paper applies the theory of social diffusion developed by Dodd and Winthrop, and the concept of social solvation designed by Sarnowska et al., to study the diffusion of places at the time of lockdown. The data are derived from a qualitative study of migrant families in Poland during the school shutdown. This study investigates how the mixture of various places within the home has affected the lives of family members.

Źródło:

Kultura i Społeczeństwo; 2021, 65, 3; 27-45
2300-195X

Pojawia się w:

Kultura i Społeczeństwo

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

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

/5

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Skocz do pozycji: 13.

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

/5

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Skocz do pozycji: 14.

Tytuł:

Sound diffuser made of acoustic metamaterial: numerical and experimental investigation

Autorzy:

Rubacha, Jarosław

Powiązania:

https://bibliotekanauki.pl/articles/2146653.pdf

Data publikacji:

2021

Wydawca:

Politechnika Poznańska. Instytut Mechaniki Stosowanej

Tematy:

metamaterial
sound diffusion
diffusion coefficient
metamateriał
dyfuzja dźwięku
współczynnik dyfuzji

Opis:

The use of metamaterials in room acoustics is becoming more and more popular. Their advantage is the possibility of adjusting the parameters of the systems in the desired frequency range and the reduction of dimensions compared to the existing solutions. This paper discusses the numerical design and experimental verification of sound diffuser based on the acoustic metamaterials: a slit with added quart-wave length resonator. The transfer matrix method is used to make a numerical model of the metamaterial cell, which was used to build a model of a diffuser composed of N = 7 cells. Then, the dimensions of the diffuser were optimized to obtain the sound diffusion in a wide frequency range. The sound dispersion coefficient was also calculated using the FEM method. The numerical results were compared with the measurements and it was shown that it is possible to make a broadband sound diffuser with the use of metamaterials.

Źródło:

Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021207
0860-6897

Pojawia się w:

Vibrations in Physical Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

FORMULATION AND EVALUATION OF INDOMETHACIN LOADED NANOSPONGES FOR ORAL DELIVERY

Autorzy:

Abbas, Nasir
Sarwar, Komal
Irfan, Muhammad
Hussain, Amjad
Mehmood, Rabia
Arshad, Muhammad S.
Shah, Pervaiz A.

Powiązania:

https://bibliotekanauki.pl/articles/895238.pdf

Data publikacji:

2018-10-31

Wydawca:

Polskie Towarzystwo Farmaceutyczne

Tematy:

sustained release
indomethacin
Nanosponges
Emulsion solvent diffusion method
Franz diffusion cell

Opis:

Nanosponges (NS) loaded sustained release tablet formulations of a non-steroidal anti-inflammatory drug; Indomethacin were successfully developed and evaluated for their pharmaceutical properties. Twelve nanosponge formulations were fabricated by solvent diffusion method by using different ratios of drug and polymers (ethyl cellulose and polyvinyl alcohol). Particle size of all the formulations was in the nano range of 221 to 625 nm and it was found dependent on the polymer concentration. Drug loading and entrapment efficiency was ranged in 32.2 to 59.4 % and 30.1 to 64.8 %, respectively. Formulations with equal proportion of drug and polymer resulted in higher values of drug loading and entrapment efficiency. Percent yield was also found dependent on the relative drug polymer ratio with highest value of 51 % was achieved for the formulation having same drug to polymer ratio. SEM results confirmed the formation of spherical and porous structures. Structural analysis by Fourier transform infrared spectroscopy (FTIR), powder x-ray diffraction (PXRD) showed the absence of any interaction between drug and polymer. In comparison to pure drug, NS formulations showed a linear intrinsic dissolution rate (IDR) profile depicting a controlled release profile. Diffusion studies of NS formulations performed by Franz diffusion cell and dialysis bag methods showed comparable results in terms of precision and linearity of diffusion profile. Tablets prepared from the drug loaded NS showed acceptable values for hardness, friability and drug content. Release of drug from NS tablets was confirmed as sustained release behaviour.

Źródło:

Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 5; 1201-1213
0001-6837
2353-5288

Pojawia się w:

Acta Poloniae Pharmaceutica - Drug Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Global existence and asymptotic behavior for a nonlinear degenerate SIS model

Autorzy:

Ziane, T. A.

Powiązania:

https://bibliotekanauki.pl/articles/952842.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

reaction diffusion systems
degenerate diffusion
global existence
asymptotic behavior
population dynamics

Opis:

In this paper we investigate the global existence and asymptotic behavior of a reaction diffusion system with degenerate diffusion arising in the modeling and the spatial spread of an epidemic disease.

Źródło:

Opuscula Mathematica; 2013, 33, 4; 615-630
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

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

/5

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Skocz do pozycji: 18.

Tytuł:

A laboratory facility (RTD) to study radon transport through modeled soil bed: results of preliminary measurements

Autorzy:

Kozak, K.
Mazur, J.
Hovhannisyan, H.

Powiązania:

https://bibliotekanauki.pl/articles/148126.pdf

Data publikacji:

2009

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

radon
transport
facility
diffusion

Opis:

The paper describes a laboratory facility (radon transport device – RTD) which makes it possible to study radon transport. The measuring position is a vertical cylindrical vessel with a height of 202 cm and a diameter of 24 cm. It can be filled with sand, gravel or other soil materials to be studied. The facility is providing radon gas from the source to the studied material and making it possible to measure radon concentration at different vertical distances from the source. The parameters of the medium (temperature, humidity) can be measured at the same time. The preliminary measurements using the RTD with sand as medium are presented.

Źródło:

Nukleonika; 2009, 54, 3; 193-198
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Change of composition and structure of diffusion chrome coating during friction

Autorzy:

Sharifov, Z. Z.
Bashirov, F. R.

Powiązania:

https://bibliotekanauki.pl/articles/359817.pdf

Data publikacji:

2013

Wydawca:

Akademia Morska w Szczecinie. Wydawnictwo AMSz

Tematy:

diffusion
friction
phase matrix

Opis:

The paper studied the behavior of the composition and structure of the diffusion of chromium coatings in sliding. It was found that the strain in friction generates the secondary structure of chromium coatings and as a result of the deformation effect wear is accelerated due to separation of the coating.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 33 (105); 96-99
1733-8670
2392-0378

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Szczecinie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Depth Analysis of Crystalline Silicon Used for Radiation-Hard Detectors

Autorzy:

Moloi, S.
McPherson, M.

Powiązania:

https://bibliotekanauki.pl/articles/1033420.pdf

Data publikacji:

2017-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

silicon
diffusion
XPS
detectors

Opis:

Depth analysis of metal-doped crystalline silicon by the X-ray photoelectron spectroscopy technique is presented in this work. The results from this technique are used to complement those from previous techniques. The metals diffused into the silicon are gold, platinum, erbium, and niobium. In silicon, these metals induce defects that are responsible for relaxation behaviour of the material. Relaxation material is radiation-hard since the effects of radiation on devices fabricated on the material are suppressed. Considerable amounts of gold, platinum, and niobium are found in the silicon bulk. The results of this work are in good agreement with those reported earlier on the same samples using the Rutherford backscattering technique. The spectra of the natural contaminants, carbon and oxygen, are also analysed in this work.

Źródło:

Acta Physica Polonica A; 2017, 132, 4; 1387-1392
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

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

/5

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Skocz do pozycji: 22.

Tytuł:

Numerical solutions by EFGM of MHD convective fluid flow past a vertical plate immersed in a porous medium in the presence of cross diffusion effects via biot number and convective boundary condition

Autorzy:

Raju, R. S.
Reddy, B. M.
Rashidi, M. M.
Gorla, R. S. R.

Powiązania:

https://bibliotekanauki.pl/articles/265443.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

thermal diffusion
diffusion thermo
MHD
porous medium
EFGM
dyfuzja termiczna
magnetohydrodynamika
porowatość

Opis:

In this investigation, the numerical results of a mixed convective MHD chemically reacting flow past a vertical plate embedded in a porous medium are presented in the presence of cross diffusion effects and convective boundary condition. Instead of the commonly used conditions of constant surface temperature or constant heat flux, a convective boundary condition is employed which makes this study unique and the results more realistic and practically useful. The momentum, energy, and concentration equations derived as coupled second-order, ordinary differential equations are solved numerically using a highly accurate and thoroughly tested element free Galerkin method (EFGM). The effects of the Soret number, Dufour number, Grashof number for heat and mass transfer, the viscous dissipation parameter, Schmidt number, chemical reaction parameter, permeability parameter and Biot number on the dimensionless velocity, temperature and concentration profiles are presented graphically. In addition, numerical results for the local skin-friction coefficient, the local Nusselt number, and the local Sherwood number are discussed through tabular forms. The discussion focuses on the physical interpretation of the results as well as their comparison with the results of previous studies.

Źródło:

International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 613-636
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

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

/5

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Skocz do pozycji: 24.

Tytuł:

The quantum diffusion of carbon in alfa-iron in low temperature

Autorzy:

Dąbrowski, L.
Andreev, A.
Georgiev, M.

Powiązania:

https://bibliotekanauki.pl/articles/147484.pdf

Data publikacji:

2006

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

carbon
diffusion
tunneling
adiabatic
polaron

Opis:

Recent experimental data on the diffusion coefficient of carbon in á-iron below liquid nitrogen temperature (LNT) question the classical approach to the observed temperature dependence. As the temperature is lowered below LNT, the diffusion constant tends to a nearly temperature-independent value rather than continuing its activated trend. The low temperature branch is apparently characteristic of a quantum mechanical process dominated by tunneling in ground state. Concomitantly we apply an occurrence-probability approach to describing the overall temperature dependence as a single continuous rate. Within the adiabatic approximation the electronic eigenvalue depending parametrically on the nuclear coordinates is taken to be the potential energy to control the motion of the nuclei. The resulting rate involves all horizontal-tunneling energy-conserving elastic transitions at the quantized energy levels of the migrating atom. A small though not negligible slope in the temperature dependence as the temperature is raised below 100 K is dealt with by complementing for the rate of a parallel one-phonon inelastic-tunneling process in excess to the basic elastic-tunneling rate. Our combined approach agrees well with the experimental data. In particular, the frequency of the coupled vibration is obtained virtually identical to the carbon vibrational frequency from inelastic neutron scattering data. The migrational barrier is also found to be within the limits expected for alfa-iron.

Źródło:

Nukleonika; 2006, 51, 2; 93-99
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

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

/5

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Skocz do pozycji: 26.

Tytuł:

The Effect of Geometrical and Material Modification of Sound Diffusers on Their Acoustic Parameters

Autorzy:

Pilch, A.
Kamisiński, T.

Powiązania:

https://bibliotekanauki.pl/articles/176935.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Schroeder diffusers
scattering
diffusion
absorption

Opis:

Sound diffusers, in particular those based on changes in the phase of the reflected wave (Schroeder diffusers), have recently gained greatly in popularity in acoustics as an effective means to eliminate defects and improve the acoustic performance of interiors. This paper draws attention to a possibility of shaping acoustic parameters of sound diffusers and fundamental errors made in applying diffusers. Also, an often neglected issue of sound absorption by diffusers has been tackled. The presented results of laboratory measurements indicate a great significance of the diffusers' rigidity and geometry on their absorption coefficient at low frequencies. The effect of arrangement of elements on the diffusion coefficient was analysed for two types of elements based on the prime number N = 7.

Źródło:

Archives of Acoustics; 2011, 36, 4; 955-966
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

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

/5

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Skocz do pozycji: 28.

Tytuł:

Dissolution kinetics of secondary covellite resulted fromdigenitedissolutionin ferric/acid/chloride media

Autorzy:

Aracena, Alvaro
Espinoza, Camila
Jerez, Oscar
Carvajal, Danilo
Jaques, Aldonza

Powiązania:

https://bibliotekanauki.pl/articles/110306.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

dissolution kinetics
digenite
covellite
diffusion

Opis:

Dissolution kinetics of digenite (Cu₉S₅) was studied in Fe³+-H₂SO₄-NaCl media. The temperature range for the study was between 297 and 373 K (24 and 100°C), with a ferric concentration between 0.0100 and 0.0806 mol/dm³, a sulfuric acid concentration of 0.05 to 1.5 mol/dm3 and a NaCl concentration of 1.5 to 5 mol/dm3. Agitation speed and particle size were also studied. Results indicate that the dissolution mechanisms of digenite occurs in two stages: i) generation of covellite (CuS) with the formation of cupric ion (Cu²⁺) and ii) dissolution of covellite (CuS) with copper production in the system, as well as amorphous sulfur (S°). The second stage occurred very slowly compared to the first stage, the above variables studied directly affected the second stage. Temperature, Fe^{3+ and H₂SO₄ concentration positively affected dissolution of covellite formed (second stage), while the presence of NaCl did not increase dissolution of Cu₉S₅ or CuS. Results showed that stirring speed had an important role in the dissolution rate of CuS. Dissolution kinetics was analyzed using the model of diffusion through the porous layer. Covellite dissolution reaction order was 2.3 and 0.2 with respect to the concentration of ferric and sulfuric acid, respectively, and the rate was inversely proportional to particle size. The calculated activation energy was 36.1 kJ/mol, which is a typical value for a reaction controlled by diffusion in the porous layer at temperature between 297 and 373 K (24 and 100°C).}

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 4; 840-851
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

A Diffusion Model of Binary Systems Controlled by Chemical Potential Gradient

Autorzy:

Wróbel, Marek
Burbelko, Andriy

Powiązania:

https://bibliotekanauki.pl/articles/2105206.pdf

Data publikacji:

2022

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

diffusion
modelling
CALPHAD
chemical potential

Opis:

The paper presents a model of diffusion in a single phase with chemical potential gradient as the driving force of the process. Fick’s laws are strictly empirical and the assumption that the concentration gradients are the driving forces of diffusion is far from precise. Instead, the gradient of chemical potential μi of component i is the real driving force. The matter of governing equations of models that incorporate this approach will be raised and discussed in this article. One of more important features is the ability to acquire results where diffusion against the concentration gradient may occur. The presented model uses the Finite Difference Method (FDM) and employs the CALPHAD method to obtain chemical potentials. The calculations of chemical potential are carried out for instant conditions – temperature and composition – in the entire task domain by Thermo-Calc via a TQ-Interface. Then the heterogeneity of chemical potentials is translated into mass transfer for each individual element. Calculations of two modelling tasks for one-dimension diffusion field were carried out. First: isothermal conditions with linear initial composition distribution and second: constant temperature gradient with uniform chemical composition in the specimen. Results for two binary solid solutions: Fe-C and Fe-Si, in the FCC phase for the given tasks will be presented. Modelling allows us to estimate the time needed to reach a desired state in a particular equilibrium or quasi-equilibrium state. It also shows the path of the composition change during the process. This can be used to determine whether the system at some point is getting close to the formation of another phase due to significant deviation from its initial conditions.

Źródło:

Journal of Casting & Materials Engineering; 2022, 6, 2; 39--44
2543-9901

Pojawia się w:

Journal of Casting & Materials Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Verantwortungsdiffusion in der Digitalisierung

Autorzy:

Bruns, Lukas Bernfried

Powiązania:

https://bibliotekanauki.pl/articles/2130272.pdf

Data publikacji:

2020

Wydawca:

Instytut Studiów Międzynarodowych i Edukacji Humanum

Tematy:

diffusion of responsibility
digitalization
newspaper

Opis:

This article shows the results of narrative interviews and the analysis of the phenomenon diffusion of responsibility. It deals with small and medium sized newspaper companies and their problems regarding the market transformations, shrinking customers, responsibility problems and the digi- talization. The research shows that Newspaper CEO ́s spread responsibility pluralistic within their companies and don ́t have a focus on the right management, to solve the old and the foreseeable problems. This article is further a psychological and an economic research work with latest points of view.

Źródło:

Humanum. Międzynarodowe Studia Społeczno-Humanistyczne; 2020, 1(36); 21-25
1898-8431

Pojawia się w:

Humanum. Międzynarodowe Studia Społeczno-Humanistyczne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Interest rate models

Autorzy:

Palczewski, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/748527.pdf

Data publikacji:

2002

Wydawca:

Polskie Towarzystwo Matematyczne

Tematy:

Finance, portfolios, investment
Diffusion processes

Opis:

.
This is a well-written survey paper on post-Heath-Jarrow-Morton interest rate models. The bond pricing and term structure are based on time-dependent continuous-time diffusions, and the main particular cases, including LIBOR and SWAP, are studied in detail.

Źródło:

Mathematica Applicanda; 2002, 30, 44/03
1730-2668
2299-4009

Pojawia się w:

Mathematica Applicanda

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Characterisctics of aeration properties of Orthic Luvisol from Poland under different land use

Autorzy:

Stepniewski, W.
Stepniewska, Z.
Przywara, G.
Brzezinska, M.
Wlodarczyk, T.

Powiązania:

https://bibliotekanauki.pl/articles/24066.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

catalase activity
soil aeration
Polska
aeration
oxygen diffusion rate
oxygen diffusion coefficient
gas diffusion coefficient
redox potential
dehydrogenase activity
aeration parameter
soil moisture

Źródło:

International Agrophysics; 2000, 14, 4
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

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

/5

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Skocz do pozycji: 34.

Tytuł:

Badanie transportu składnika w układach symulujących układy biomedyczne
Component mass transfer in systems simulating biomedical systems

Autorzy:

Adach, A.
Pawlak, A.
Zera, A.
Kaczorowska, B.
Kamińska, D.

Powiązania:

https://bibliotekanauki.pl/articles/2072081.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

dyfuzja
transport leków
transport substancji
komora dyfuzyjna
diffusion
drug release
substance transfer
diffusion chamber

Opis:

Podstawowym mechanizmem transportu masy w układach biomedycznych jest dyfuzja w ciałach porowatych lub cieczy, transport przez błony selektywne. W pracy doświadczalnie zbadano szybkość transportu składnika wykorzystując skonstruowany zestaw sekwencyjny, będący modyfikacją komory dyfuzyjnej i metody warstwy półnieskończonej. Substancją aktywną była czerwień koszenilowa A. Stosowano takie media jak: hydrożele, syntetyczna ślina, roztwór cieczy lepkiej imituj ący śluz (roztwory soli sodowej karboksymetylocelulozy). Jako podkładki wykorzystywano membrany Pałł Supor 100 Membrane Filters PES (0,1 μm). Wyznaczono gęstości strumienia składnika, współczynniki filtracji oraz wartości zastępczego współczynnika dyfuzji.
The basic mechanism of mass transfer in biomedical systems is diffusion in porous bodies or liquids and transport by selective membranes. An originally designed system with the sequential unit as a main element, being the modification of diffusion chamber, was constructed. An active substance applied was Cochineal Red A, whereas hydrogels, synthetic saliva and solution of viscous liquid imitating mucus (solutions of sodium carboxyme-thyl cellulose) were used as media. Pall Supor 100 Membrane Filters PES (0.1 μm) were employed as rootstocks. The drug flux, permeation coefficient and effective diffusion coefficients were calculated. Keywords: diffusion, drug release, substance transfer, diffusion chamber

Źródło:

Inżynieria i Aparatura Chemiczna; 2014, 1; 8--9
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Badanie dyfuzji agregatów sadzy (DEP) w warstwie śluzu
Research on diffusion of soot aggregates (DEP) in a mucus layer

Autorzy:

Penconek, A.
Lasota, M.
Moskal, A.

Powiązania:

https://bibliotekanauki.pl/articles/2072053.pdf

Data publikacji:

2013

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

diesel
DEP
dyfuzja
śluz
diffusion
mucus

Opis:

Badania dotyczyły ochronnej roli śluzu w stosunku do cząstek sadzy. Określono współczynnik dyfuzji trzech typów agregatów sadzy przez warstwę sztucznego śluzu. Agregaty sadzy DEP (Diesel Exhaust Particles) uzyskało ze spalania różnych olei napędowych w wysokoprężnym silniku diesla. Były to struktury fraktalopodobne o wymiarach 15 i 17 oraz średnicach 30, 50 i 117 nm. Przeprowadzone badania wykazały, że niezależnie od typu agregatów DEP śluz spowalnia ich transport, choć w różnym stopniu, w zależności od wielkości i kształtu.
Research was focused on a protective role of mucus in relation to carbon black particles. The diffusion coefficient for three types of carbon black aggregates through a layer of artificial mucus was determined. Diesel exhaust particles were obtained from the combustion of various fuels in a diesel oil engine. They were fractal-like structures with dimensions of 15 and 17 and diameters of 30, 60 and 117 nm. The study showed that, regardless of a type of DEP aggregates, mucus slowed their transport in degree depending on their size and shape.

Źródło:

Inżynieria i Aparatura Chemiczna; 2013, 6; 550--551
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Comparison of optimization algorithms for inverse FEA of heat and mass transport in biomaterials
Porównanie algorytmów optymalizacji w analizie odwrotnej transportu ciepła i masy w biomateriałach

Autorzy:

Weres, J.
Olek, W.
Kujawa, S.

Powiązania:

https://bibliotekanauki.pl/articles/279448.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

heat conduction
water diffusion
inverse modeling

Opis:

Inverse analysis has become increasingly important for estimating coefficient values for heat and moisture transport in complex biological materials. With this approach, an improved accuracy of predicting transport processes can be obtained as compared to simulations based on coefficients determined by experimental procedures only. Such improvement is indispensable for successful analyzing, designing and managing most technological processes in the agri-food and forest products industries. In recent years, many optimization algorithms have been developed to solve inverse problems. Performance of the following algorithms was analyzed and compared in this paper: simulated annealing, tabu search, genetic algorithm, variable metric algorithm and trust region algorithm. Results demonstrated that although all the algorithms were able to estimate the coefficients, there were differences in their performance and due to high computational complexity of the problem only the trust region procedure was acceptable.
Znaczenie analizy odwrotnej w oszacowywaniu wartości współczynników transportu ciepła i wody w złożonych materiałach pochodzenia biologicznego stale wzrasta. Dzięki zastosowaniu tej metody można zwiększyć dokładność prognozowania procesów transportowych w porównaniu do symulacji opartych na współczynnikach, których wartości są określane wyłącznie metodą eksperymentów naturalnych. Uzyskiwana poprawa dokładności jest niezmiernie przydatna w analizie, projektowaniu i zarządzaniu większością procesów technologicznych w przemyśle rolno-spożywczym i drzewnym. W ostatnich latach zostało opracowanych wiele algorytmów optymalizacji do rozwiązywania zagadnień odwrotnych. W niniejszej pracy poddano analizie i porównano działanie następujących algorytmów: symulowane wyżarzanie, poszukiwanie z tabu, algorytm genetyczny, algorytm zmiennej metryki oraz algorytm obszarów zaufania. Wyniki wskazały, że chociaż wszystkie algorytmy potrafiły oszacować wartości współczynników, pojawiły się różnice w ich działaniu i ze względu na dużą złożoność obliczeniową rozpatrywanego problemu tylko procedura obszarów zaufania przynosiła satysfakcjonujące wyniki.

Źródło:

Journal of Theoretical and Applied Mechanics; 2009, 47, 3; 701-716
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Admixture diffusion in a two-phase random nonhomogeneous stratified layer

Autorzy:

Chaplia, Y.
Chernukha, O.

Powiązania:

https://bibliotekanauki.pl/articles/281903.pdf

Data publikacji:

2001

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

admixture diffusion
random nonhomogeneous stratified layer

Opis:

Vertical admixture diffusion has been considered in a layer with random nonhomogeneous two-phase stratified structure of material. Different phase diffusion coefficients and phase densities have been taken into account as well as jump discontinuities of the diffusion coefficient at interphase boundaries. Averaging the obtained expressions for the admixture concentration has been done over the ensemble of sublayer configurations with equally probable distribution, and two particular cases of beta-distribution of phases in the body.
Dyfuzja substancji domieszkowej w dwufazowej warstwie losowo niejednorodnej. Rozważona jest jednowymiarowa (pionowa) dyfuzja substancji domieszkowej w warstwie tworzonej przez losowo-niejednorodny, dwufazowy materiał warstwowy.Przy konstruowaniu rozwiązań uwzględniono zarówno różnice współczynników dyfuzji i gęstości w różnych fazach, jak i nieciągłości współczynnika dyfuzji na granicach faz. Zgodnie z zaproponowanym podejściem przy rozwiązaniu zagadnienia brzegowego dyfuzji wpływ niejednorodności materiału sprowadzą się do rozpatrywania źródeł wewnętrznych masy, a same zagadnienie - do równania całkowego, które z koleji rozwiązano metodą rozwinięcia w szereg Neymana. Uśrednienieprzybliżonego rozwiązania po zbiorze konfiguracji faz, z których złożone jest ciało, wykonano dla równomiernego losowego rozkładu faz oraz dwóch szczegółowych przypadków rozkładu beta. Porównanie rozkładów uśrednionego pola koncentracji i koncentracji w jednorodnym ośrodku pokazało potrzebę wzięcia pod uwagę zarówno różnych dyfuzyjnych właściwości faz, jak i nieciągłości współczynnika dyfuzji na granicach faz w warunkach doskonałego kontaktu. Oprócz wyznaczono zależność uśrednionej koncentracji składnika domieszkowego od współczynników dyfuzji, gęstości i objętościowych udziału faz dla losowego rozkładu beta podwarstw.

Źródło:

Journal of Theoretical and Applied Mechanics; 2001, 39, 4; 929-946
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Desorpcyjna metoda typu √t jako narzędzie do pomiarów dyfuzyjności w wąskich przedziałach wilgotności
The Desorptive √t -type method as a tool for measurements of mass diffusivity in narrow humidity ranges

Autorzy:

Garbalińska, H.

Powiązania:

https://bibliotekanauki.pl/articles/363050.pdf

Data publikacji:

2005

Wydawca:

Instytut Fizyki Budowli Katarzyna i Piotr Klemm

Tematy:

wilgotność
desorbcja
dyfuzja
humidity
desorption
diffusion

Opis:

Referat przedstawia wyniki niestacjonarnych pomiarów desorp- cyjnych współczynnika dyfuzji D m wyznaczonych przy pomocy procedury typu √t. Eksperyment obejmował 3 zaprawy cementowe o różnych wskaźnikach w/c. Badania desorpcji przeprowadzone zostały przy temperaturze T=20°C, w której testowanych było pięć węższych sąsiadujących ze sobą przedziałów wilgotności Δ φ.
This paper presents results of non-stationary desorption measurements of mass diffusivity D m that were obtained through a √t-type procedure. The experiment covered three cement mortars of different w/c ratio. The desorption study was carried out at the temperature T=20°C and five narrower adjacent humidity ranges Δ φ have been tested.

Źródło:

Fizyka Budowli w Teorii i Praktyce; 2005, T. 1; 80-87
1734-4891

Pojawia się w:

Fizyka Budowli w Teorii i Praktyce

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

In situ measurement of diffusivity

Autorzy:

Berne, P.
Pocachard, J.

Powiązania:

https://bibliotekanauki.pl/articles/148818.pdf

Data publikacji:

2005

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

diffusion
porous media
in situ measurement

Opis:

The mechanism of molecular diffusion controls the migration of contaminants in very low-permeability porous media, like underground facilities for the storage of hazardous waste. Determining the relevant diffusion coefficients is, therefore, of prime importance. A few techniques exist for the in situ measurement of that quantity, but they suffer from many handicaps (duration, complexity and cost of the experiments). We propose here two innovative methods that have some potential to improve this situation. So far, we have found them feasible on the basis of design calculations and laboratory experiments. This work is presently protected by a patent.

Źródło:

Nukleonika; 2005, 50, 1; 3-7
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Properties of Tool Steel After Hybrid Treatment Connecting Diffusion Chromizing with the PVD Method

Autorzy:

Kasprzycka, E.
Bogdański, B.

Powiązania:

https://bibliotekanauki.pl/articles/351463.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

diffusion chromizing
PVD coating
carbide layer

Opis:

The objective of the research in this work was the modification of structure of carbide-type chromized layers, by the combination of diffusion chromizing with subsequent PVD treatment, consisting of chromium nitride deposition, carried out to improve their tribological properties. As a result, hybrid layers on the surface of tool steel were obtained. For comparison, the properties of single chromized carbide layers obtained in a diffusion chromizing process were tested. Investigations of layer microstructure, their mechanical properties, surface topography, adhesion of layers to the steel substrate, as well as tribological properties were conducted. The layer microstructure was characterized by X-ray diffraction and scanning electron microscopy. Topography of the layer surface was studied by an optical profilometer. The scratch test for investigations of layers adhesion to the steel substrate was used. Testing of tribological properties (linear wear) of the layers was performed by the three-cylinder-cone method. It was shown, that hybrid layers are characterized by a significantly smaller surface roughness than that of chromized carbide layers and their wear resistance improved almost twice with respect to carbide layers.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 1; 235-242
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

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

/5

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Skocz do pozycji: 42.

Tytuł:

Bayesian DEJD Model and Detection of Asymmetry in Jump Sizes

Autorzy:

Kostrzewski, Maciej

Powiązania:

https://bibliotekanauki.pl/articles/2076552.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

double exponential jump diffusion model
Kou model
Bernoulli jump-diffusion model
MCMC methods
latent variables

Opis:

News might trigger jump arrivals in financial time series. The "bad" news and "good" news seem to have distinct impact. In the research, a double exponential jump distribution is applied to model downward and upward jumps. Bayesian double exponential jump-diffusion model is proposed. Theorems stated in the paper enable estimation of the model’s parameters, detection of jumps and analysis of jump frequency. The methodology, founded upon the idea of latent variables, is illustrated with simulated data.

Źródło:

Central European Journal of Economic Modelling and Econometrics; 2015, 1; 43-70
2080-0886
2080-119X

Pojawia się w:

Central European Journal of Economic Modelling and Econometrics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Vlasov plasma description of pair plasmas with dust or ion impurities

Autorzy:

Atamaniuk, B.
Turski, A. J.

Powiązania:

https://bibliotekanauki.pl/articles/146468.pdf

Data publikacji:

2012

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

pair plasmas
fractional diffusion
Vlasov plasmas

Opis:

The paper contains a unified treatment of disturbance propagation (transport) in the linearized Vlasov electron-positron and fullerene pair plasmas containing charged dust impurities, based on the space-time convolution integral equations. An initial-value problem for Vlasov-Poisson/Ampčre equations is reduced to the one multiple integral equation and the solution is expressed in terms of forcing function and its space-time convolution with the resolvent kernel. The forcing function is responsible for the initial disturbance and the resolvent is responsible for the equilibrium velocity distributions of plasma species. By use of resolvent equations, time-reversibility, space-reflexivity and the other symmetries are revealed. The symmetries carry on physical properties of Vlasov pair plasmas, e.g., conservation laws. Properly choosing equilibrium distributions for dusty pair plasmas, we can reduce the resolvent equation to: (i) the undamped dispersive wave equations, (ii) wave-diffusive transport equation, and (iii) diffusive transport equations of oscillations. In the last case, we have to do with anomalous diffusion employing fractional derivatives in time and space.

Źródło:

Nukleonika; 2012, 57, 2; 317-319
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Solution of diffusion-advection equation of radon transport in many-layered geological media

Autorzy:

Yakovleva, V. S.
Parovik, R. I.

Powiązania:

https://bibliotekanauki.pl/articles/148852.pdf

Data publikacji:

2010

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

radon
diffusion
advection
transport
modeling
soil

Opis:

Radon transport modeling in geological media is an important tool for solving problems and tasks of radioecology and geophysics. Comparison of radon field time series obtained by numerical and experimental methods is one of the most common and widely applicable ways to analyze the influence of state and variability of meteorological, electrical and actinometric parameters of atmosphere, cosmic weather factors, variations of deflected mode of geological medium on the level and variations of radon field. The solutions of stationary and non-stationary diffusion-advection equations of radon transport in many-layered geological media by numerical methods, notably by integro-interpolation method (balance method) are presented. The peculiarity of radon transport in many-layered media is taken into account in the developed numerical model. This peculiarity is connected with the transport equation coefficients which can change very rapidly at the border of two adjacent layers, i.e. they can be discontinuous at the borders of each layer that can be caused by parameters of soils greatly differing in value (density, porosity, radium content, diffusion and emanation coefficients). The present work is provided with an example of application of the developed numerical model for solving a practical problem on assessment of influence of deep seated uranium-containing rock on the value of radon volumetric activity at the depth of less-than or equal to 1 m. The article considers non-stationary numerical model calculations showing at what time moments the distribution curves of radon volumetric activity coincide with stationary regime of radon transport in geological media. The validity of the developed numerical solution has been confirmed by these calculations.

Źródło:

Nukleonika; 2010, 55, 4; 601-606
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Measurements of plasma diffusion coefficient in Pilot-PSI device using Katsumata probe

Autorzy:

Solomon, M. L.
Mihaila, I.
Anita, V.
Costin, C.
Popa, G.
van der Meiden, H.
Al, R.
van Rooij, G.
Cardozo, N. L.
Rapp, J.
Ionita, C.
Stärz, R.
Schrittwieser, R.

Powiązania:

https://bibliotekanauki.pl/articles/385269.pdf

Data publikacji:

2009

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

Katsumata probe
magnetized plasma
diffusion coefficient

Opis:

Cross-field transport of particles and energy is a major issue in magnetized fusion-relevant plasmas, due to its relevance for plasma confinement. In this paper Katsumata probe measurements performed in Pilot-PSI linear magnetized plasma device are presented. The plasma diffusion coefficient in perpendicular direction to the magnetic field was estimated from the measurements.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 160-162
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

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

/5

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Skocz do pozycji: 47.

Tytuł:

Zastosowanie procesu destylacji dyfuzyjnej w aparatach z opadającym filtrem cieczy do rozdziału mieszaniny dwuskładnikowej
Application of diffusion distillation in separation of binary mixture in the falling film apparatus

Autorzy:

Ziobrowski, Z.
Krupiczka, R.

Powiązania:

https://bibliotekanauki.pl/articles/2071099.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

destylacja dyfuzyjna
odparowanie
diffusion destillation
evaporation

Opis:

Przeprowadzono badania doświadczalne procesu odparowania filmu ciekłej mieszaniny dwuskładnikowej spływającej po ściance rury pionowej w obecności nieruchomej warstwy gazu inertnego. W opracowanych modelach matematycznych uwzględniono opory transportu ciepła i masy w fazie ciekłej oraz gazowej. Stwierdzono niewielki wpływ oporów dyfuzyjnych w fazie ciekłej na całkowity strumień molowy i selektywność oraz istotny wpływ efektów krzyżowych dyfuzji, rodzaju gazu inertnego oraz temperatury odparowania na efektywność procesu.
Falling film evaporation of binary mixture on a vertical surface in the presence of stagnant inert gas was investigated experimentally. In elaborated mathematical models heat and mass transfer resistances in both gas and liquid phases were taken into account. A comparison of experimental and calculated data showed a small effect of diffusion resistances in liquid phase on total mass flux and selectivity, and a significant influence of cross diffusion effects, kind of inert gas and evaporation temperature on process efficiency.

Źródło:

Inżynieria i Aparatura Chemiczna; 2010, 3; 123-124
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Drying of binary thin film polymeric coatings: an experimental study

Autorzy:

Katariya, J.
Arya, R.K.

Powiązania:

https://bibliotekanauki.pl/articles/778937.pdf

Data publikacji:

2012

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Binary Coatings
thin films
drying
diffusion

Opis:

Four binary polymer -solvent systems, poly(styrene)-tetrahydrofuran, poly(styrene) - p-xylene, poly(methyl methacrylate) - ethylbenzene and poly(methyl methacrylate) - tetrahydrofuran, systems have been studied. It has been observed that thicker coatings will retain a higher amount of the residual solvent as compared to thinner coatings. In the case of poly(styrene)-tetrahydrofuran coating residual solvent remaining within the coatings were 9.09% and 4.74% for the coatings of the thicknesses of 967 micron and 559 micron, respectively. Similar trends were also observed in the case of poly(methyl methacrylate)-ethylbenzene, poly(methyl methacrylate)-tetrahydrofuran, and poly(styrene)-p-xylene systems.

Źródło:

Polish Journal of Chemical Technology; 2012, 14, 4; 83-87
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Ferrite Decarburization of High Silicon Spring Steel in Three Temperature Ranges

Autorzy:

Zhao, F.
Zhang, C. L.
Liu, Y. Z.

Powiązania:

https://bibliotekanauki.pl/articles/350822.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

surface decarburization
steel
oxidation
carbon diffusion

Opis:

Surface decarburization of high silicon spring steel in ambient air was studied. The experimental results confirmed the decarburized mechanism under A_C1 temperature, in the temperature range of A_C1-A_C3 and A_C3-G. Under A_C1 temperature, pearlite spheroidization and surface decarburization are carried out simultaneously and pearlite spheroidization is reinforced. Considering the oxidation loss depth, the “true ferrite decarburized depth” at 850 °C (A_C3-G) is still smaller than that at 760°C (A_C1-A_C3). That is because an “incubation period” must pass away before ferrite decarburization occurs in the temperature range of A_C3-G, and the ferrite decarburized rate is limited to being equal to the partial decarburized rate.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 3; 1715-1722
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

A review of the physical chemistry of dyeing chitin and chitosan

Autorzy:

Roberts, George A. F.

Powiązania:

https://bibliotekanauki.pl/articles/1034677.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

chitin
chitosan
dye adsorption
dye diffusion

Opis:

The literature on the adsorption and diffusion of anionic dyes, including acid, direct, reactive and metal-complexed dyes, on chitin and chitosan is reviewed. The similarity of the overall chain structure of cellulose to both chitin and chitosan, together with the presence of the C(2)-amine groups on the latter two polymers, means that they show considerable similarity in dyeing behaviour to both polysaccharide and protein substrates.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 5-17
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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