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:

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: 6.

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: 7.

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: 8.

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: 9.

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: 10.

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: 11.

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: 12.

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: 13.

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: 14.

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: 15.

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: 16.

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: 17.

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: 18.

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: 19.

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: 20.

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: 21.

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: 22.

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: 23.

Tytuł:

A Classical Approach to Dynamics of Parabolic Competitive Systems

Autorzy:

Pietruk, Małgorzata
Przeradzki, Bogdan

Powiązania:

https://bibliotekanauki.pl/articles/44444333.pdf

Data publikacji:

2010

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

Reaction-diffusion system
competition.

Opis:

We study the reaction-diffusion system, its stationary solutions, the behavior of the system near them and discuss similarities and differences for different boundary conditions.

Źródło:

Acta Universitatis Lodziensis. Folia Mathematica; 2010, 17; 23-38
2450-7652

Pojawia się w:

Acta Universitatis Lodziensis. Folia Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

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: 25.

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: 26.

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: 27.

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: 28.

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: 29.

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: 30.

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: 31.

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: 32.

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: 33.

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: 34.

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: 35.

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: 36.

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: 37.

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: 38.

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: 39.

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: 40.

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: 41.

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: 42.

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: 43.

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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Skocz do pozycji: 44.

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: 45.

Tytuł:

Warstwy węglikowe wytwarzane w procesie chromowania próżniowego na powierzchni stali pokrytej stopami niklu z pierwiastkami węglikotwórczymi
Carbide layers produced in vacuum chromizing process on steel surface covered with nickel alloys containing carbide-forming elements

Autorzy:

Bogdański, B.
Kasprzycka, E.
Tacikowski, J.
Senatorski, J. K.
Koprowski, M.

Powiązania:

https://bibliotekanauki.pl/articles/191012.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

warstwy dyfuzyjne
właściwości tribologiczne
chromowanie dyfuzyjne
obróbka galwaniczna
diffusion layers
tribological properties
diffusion chromizing
galvanic treatment

Opis:

W pracy omówiono wyniki badań warstw duplex typu CrC+(Ni-Mo), CrC+(Ni-W) oraz CrC+Ni, wytwarzanych na powierzchni stali narzędziowej w procesie chromowania próżniowego połączonym z obróbką galwaniczną. Przeprowadzono pomiary grubości i twardości warstw oraz badania ich mikrostruktury. Określono właściwości tribologiczne warstw. Stwierdzono, że odporność na zużycie przez tarcie warstw duplex typu CrC+(Ni-Mo) oraz CrC+(Ni-W) wytworzonych w procesie chromowania próżniowego na stali pokrytej stopami niklu z pierwiastkami węglikotwórczymi jest równie dobra jak warstw węglikowych typu CrC, wytwarzanych bezpośrednio na powierzchni stali, bez powłoki elektrolitycznej. Warstwy te wykazywały dużą odporność na zużycie przez tarcie, podczas gdy próbki z warstwami duplex typu CrC+Ni oraz próbki ze stali narzędziowej bez warstwy, nie wykazywały dobrych właściwości tribologicznych.
In this paper duplex layers of the CrC+(Ni-W), the CrC+(Ni-Mo) and the CrC+Ni type produced on tool steel surface, in combined galvanic and vacuum chromizing processes, have been investigated. Studies of layers thickness, hardness and their morphology have been carried out. Tribological properties of the layers have been determined. It has been proved, that the wear resistance by friction of duplex layers of the CrC+(Ni-W) and the CrC+(Ni-Mo) type, produced in vacuum chromizing of steel covered with nickel alloys containing carbide-forming elements, is such good as carbides layers of the CrC type, produced on the steel surface without electrolytic coating. The high wear resistance of these layers has been proved, whereas tribological properties of the CrC+Ni duplex layers and the steel samples without any layers were not good.

Źródło:

Tribologia; 2010, 4; 23-31
0208-7774

Pojawia się w:

Tribologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Microstructure and Magnetic Properties of NdFeB Sintered Magnets Diffusion-Treated with Cu/Al Mixed Dyco Alloy-Powder

Autorzy:

Lee, M.-W.
Bae, K.-H.
Lee, S.-R.
Kim, H.-J.
Jang, T.-S.

Powiązania:

https://bibliotekanauki.pl/articles/353351.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Nd-Fe-B sintered magnets
grain boundary diffusion process
low melting point element
DyCo alloy-powder diffusion

Opis:

We investigated the microstructural and magnetic property changes of DyCo, Cu + DyCo, and Al + DyCo diffusion-treated NdFeB sintered magnets. The coercivity of all diffusion treated magnet was increased at 880ºC of 1st post annealing(PA), by 6.1 kOe in Cu and 7.0 kOe in Al mixed DyCo coated magnets, whereas this increment was found to be relatively low (3.9 kOe) in the magnet coated with DyCo only. The diffusivity and diffusion depth of Dy were increased in those magnets which were treated with Cu or Al mixed DyCo, mainly due to comparatively easy diffusion path provided by Cu and Al because of their solubility with Ndrich grain boundary phase. The formation of Cu/Al-rich grain boundary phase might have enhanced the diffusivity of Dy-atoms. Moreover, relatively a large number of Dy atoms reached into the magnet and mostly segregated at the interface of Nd₂ Fe₁₄ B and grain boundary phases covering Nd₂ Fe₁₄ B grains so that the core-shell type structures were developed. The formation of highly anisotropic (Nd, Dy)₂Fe₁₄B phase layer, which acted as the shell in the core-shell type structure so as to prevent the reverse domain movement, was the cause of enhancing the coercivity of diffusion treated NdFeB magnets. Segregation of cobalt in Nd-rich TJP followed by the formation of Co-rich phase was beneficial for the coercivity enhancement, resulting in the stabilization of the metastable c-Nd₂O₃ phase.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2B; 1263-1266
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

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: 48.

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: 49.

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: 50.

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: 51.

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: 52.

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: 53.

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: 54.

Tytuł:

Simultaneous measurement of Cr, Mn and Fe diffusion in chromium-manganese steels

Autorzy:

Dudała, J.
Gilewicz-Wolter, J.
Stęgowski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/148882.pdf

Data publikacji:

2005

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

radiotracers
diffusion
steel
spectrum
artificial neural networks

Opis:

The paper presents an application of multitracer method to diffusion measurement in Cr-Mn steels. Radioisotope tracers of chromium 51Cr, manganese 54Mn and iron 59Fe were used simultaneously in the diffusion process. Measurements of gamma-ray spectra and the proper analysis enabled evaluation of concentration distribution for each tracer. As a new tool, artificial neural networks (ANN) method was used for analysis of spectra. The proper solution of the diffusion model was applied to the experimental tracers' distribution data and diffusion coefficients were determined.

Źródło:

Nukleonika; 2005, 50, 2; 67-71
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Spatial Structure and Distribution of Manufacturing Industries in the Greater Accra Region of Ghana

Autorzy:

Temurçin, Kadir
Kervankıran, İsmail
Dziwornu, Michael Gameli

Powiązania:

https://bibliotekanauki.pl/articles/439200.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie

Tematy:

diffusion;
Ghana;
Greater Accra;
manufacturing;
spatial structure

Opis:

A key driving force and determinant of a country’s worth in the globalized world is inherent in its level of industrialization. Certainly, other dimensions are crucial and come into play, however, the infamous classification of nations into industrialized and non-industrialized has added substantial merit to the concept. Essentially, industrialization in Ghana was based on the premise of the production and processing of its vast natural resources from traditionally primary products to tertiary and finished goods. While the industry can boast of employment generation and a model of economic growth in the 1960s and 1970s, inadequate implementation of industrial policies has resulted in the consistent contraction of the manufacturing subsector. Manufacturing sector contribution to GDP declined from 36.69% in 2000 to 6.7% in 2012 and therefore is considered the weakest link in Ghana’s industrial drive. This paper examines the growth, spatial structure, and distribution of manufacturing industries in the Greater Accra region using districts as the unit of analysis. The Greater Accra region has traditionally been the focal point of Ghana’s industrial development accounting for 23.4% of all manufacturing establishment as of 2015, most of which are concentrated in the Accra and Tema Metropolitan areas due to obvious political, socioeconomic and mobility factors. Examining historical data from 1962–2010, we found that despite the overwhelmingly large localization of manufacturing industries delete in Accra and Tema Metropolitan areas, a relative spatial redistribution of manufacturing industries was evident in the peripheral district of the region. Furthermore, the change in distribution is reflected in the pattern of employment at the district level, which per our findings shows a relative diffusion from the core districts of Accra to districts located in the peripheries. The study also found that industrial policies, such as free trade zone initiative, decentralization policies, foreign investment and improvements in critical infrastructure, have resulted in the relative spatial diffusion of manufacturing industries. These findings are significant because they show how areas without previous manufacturing base have witnessed the emergence of some form of industry.

Źródło:

Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego; 2017, 31, 4; 71-82
2080-1653

Pojawia się w:

Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Modeling the Diffusion of Dichlorvos through Human Stomach Lining

Autorzy:

Bello, O. D.
Oluwatusin, O. O.

Powiązania:

https://bibliotekanauki.pl/articles/1193343.pdf

Data publikacji:

2021

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Analytical solutions
Concentration
Dichlorvos
Diffusion
Mathematical modeling

Opis:

Dichlorvos is the main poison in sniper pesticide which has produced negative effects especially among youths in recent times. The poisonous effects of dichlorvos on humans require urgent studies to combat the damaging impacts among humans. However, the limitations of carrying out experiments on human test subjects request the quest for alternative approach. Such approach can be made through modeling the transport of dichlorvos in the human body and the resulting negative effect. Therefore, this work presents mathematical modeling for the diffusion of dichlorvos through the human stomach lining. The model is set up to determine the amount of dichlorvos that leaves the stomach through diffusion alone and the health effects various concentration of the poison has on humans. Two cases are studied in order to captivate the effects of dichlorvos poisoning for two different scenarios. The initial condition is set to 0.05L and different driving forces is used to model the scenarios in spherical coordinates. The governing equation is derived from Fick’s first law and is solved analytically, a numerical solution is obtained using MATLAB’s pdepe solver and graphs are plotted for the two cases. From the results it is observed that about 14.4% of dichlorvos is diffused through the stomach lining in about 60hours for the first case while for the second case, the periodic intake of water along with dichlorvos gradually reduces the dichlorvos concentration in the stomach. These results show consistency with some experimental results from literature. Therefore, the model can be used in addition to the modes of treatment obtained from literature to predict the concentration of dichlorvos in a person and also proffer a life-saving treatment.

Źródło:

World Scientific News; 2021, 154; 34-47
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Global existence and blow up of solutions for a completely coupled Fujita type system of reaction-diffusion equations

Autorzy:

Rencławowicz, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/1338982.pdf

Data publikacji:

1998

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

reaction-diffusion system
global existence
blow up

Opis:

We examine the parabolic system of three equations $u_t$ - Δu = $v^p$, $v_t$ - Δv = $w^q$, $w_t$ - Δw = $u^r$, x ∈ $ℝ^N$, t > 0 with p, q, r positive numbers, N ≥ 1, and nonnegative, bounded continuous initial values. We obtain global existence and blow up unconditionally (that is, for any initial data). We prove that if pqr ≤ 1 then any solution is global; when pqr > 1 and max(α,β,γ) ≥ N/2 (α, β, γ are defined in terms of p, q, r) then every nontrivial solution exhibits a finite blow up time.

Źródło:

Applicationes Mathematicae; 1998-1999, 25, 3; 313-326
1233-7234

Pojawia się w:

Applicationes Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Some optimal control problems for partial differential inclusions

Autorzy:

Kisielewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/255397.pdf

Data publikacji:

2008

Wydawca:

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

Tematy:

partial differential inclusions
diffusion processes
existence theorems

Opis:

Partial differential inclusions are considered. In particular, basing on diffusions properties of weak solutions to stochastic differential inclusions, some existence theorems and some properties of solutions to partial differential inclusions are given.

Źródło:

Opuscula Mathematica; 2008, 28, 4; 507-516
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Development of the Jewish urban settlement in Israel in view of the theory of the innovation diffusion

Autorzy:

Mularczyk, Mirosław
Mikulska, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/2029401.pdf

Data publikacji:

2004-06-01

Wydawca:

Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych

Tematy:

Jewish urban settlement
theory of innovation diffusion

Opis:

Presentation of the current state and development tendencies of Jewish urban settlement in Israel against the innovation diffusion theory. Analysis of the growth tempo of the number of cities in Israel allows to claim that urban Jewish settlement network develops in accordance with the innovation diffusion model. Assuming that the theory fits the urban settlement development pattern on the surveyed territories, the directions taken by the impulses sent by innovation sources have been determined based on the corridor settlement development theory. The hypothesis has been verified against the factors influencing spatial development directions of the Jewish urban settlement using a dynamic (synchronic-comparative) diffusion process simulation model, built with the Monte Carlo method. The conducted analyses and procedures verifying the model distribution of Jewish settlement in Israeli cities in 1948, 1967 and 1992 allowed to conclude that the highest stochastic concordance between the model accounting for the innovation diffusion theory elements, and the real distribution of Jewish settlement cities holds for 1948 and 1967. According to the diffusion innovation theory, these years correspond to the colonisation stage. The model diversifies from reality for late 1967, when network densification process was coming to an end and city competition stage was starting. Despite statistical validity of the hypotheses, the results show that besides the analysed factors influencing the development of Jewish urban settlement, other variables, not accounted for in the model, are also significantly influential.

Źródło:

Miscellanea Geographica. Regional Studies on Development; 2004, 11; 229-240
0867-6046
2084-6118

Pojawia się w:

Miscellanea Geographica. Regional Studies on Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Hybrid layer type CR/LPC

Autorzy:

Dybowski, K.
Kowalczyk, P.
Januszewicz, B.
Batory, D.

Powiązania:

https://bibliotekanauki.pl/articles/102424.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

hybrid layer
thermo-chemical treatment
metallization
diffusion

Opis:

Application of metal coatings and the carburized layer are widely known and readily used for various elements, depending on the application. Metal coatings based on chromium are used in order to increase resistance to wear, corrosion and erosion. The coatings applied by different methods have a significant drawback - they are not well related with the substratum, so there is a risk of cracking or flaking. Any discrepancies and flaws disqualify such a way as to protect the surface. Carburizing processes will be carried out, primarily in order to increase the hardness of the surface layer while maintaining a ductile core of the object. It is likely that the combination of these treatments will provide to increase the hardness of the material. The behavior of the proper order to create hybrid layer ensures the continuity of the resulting layer and its good connection with the steel. The paper presents a hybrid layer consisting of the deposited chrome and PVD in the next stage of low pressure carburizing. Conducted process allows chromium diffusion into the material, the enrichment of the steel and to ensure the continuity of the layer.

Źródło:

Advances in Science and Technology. Research Journal; 2017, 11, 2; 23-27
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Diffusion Permeability of Cation-Exchange Membrane in Different Solutions

Autorzy:

Gubari, Mohammed Qader
Abdulkarim, Abdullah Adnan
Alekseeva, Nadezda Vyacheslavovna

Powiązania:

https://bibliotekanauki.pl/articles/1955486.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

cation exchange membrane
temperature
concentration
diffusion permeability

Opis:

This work is devoted to study the effect of thermal conditions and concentrations on the diffusion permeability of a cation exchange membrane (MK-40) using sodium chloride (NaCl), sodium acetate (C2H3NaO2) and acetic acid (CH3COOH) solutions, which are usually highly concentrated components of pigment yellow 13 of industrial wastewater. A cell containing two compartments was used to analyze the properties of membrane. The results showed that the maximum diffusion permeability coefficients for NaCl, C2H3NaO2, and CH3COOH were 6.08×10-9 m2/s, 13.29×10-11 m2/s, and 25.95×10-11 m2/s, respectively. The increase in the CH3COOH solution concentration was found to improve the diffusion permeability. However, the NaCl and C2H3NaO2 solutions exhibited decreases in diffusion permeability with solution concentration. There was a significant increase in diffusion permeability with temperature.

Źródło:

Journal of Ecological Engineering; 2021, 22, 8; 140-145
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

A Layer-by-Layer Analysis of the Corrosion Properties of Diffusion Zinc Coatings

Autorzy:

Biryukov, A.
Galin, R.
Zakharyevich, D.
Wassilkowska, A.
Kolesnikov, A.
Batmanova, T.

Powiązania:

https://bibliotekanauki.pl/articles/356101.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

diffusion zinc coatings
δ-phase
texture
simonkolleite

Opis:

To obtain anti-corrosive thermo-diffusion zinc coatings, the authors use highly effective zinc saturating mixtures. This technology makes it possible to obtain coatings with a high zinc content in the δ-phase as well as a zinc-rich phase of FeZn₁₃ (ζ-phase) on the coating surface. As a result of long-term studies into the corrosion properties of thermo-diffusion zinc (TDZ) coatings conducted by the authors, a number of features of their corrosive behavior have been established. The corrosion rate of those coatings in desalted and chloride-containing media is lower than those of galvanic or hot-dip zinc coatings. The corrosion behavior depends on the content of zinc on the surface and the texture features of the coating. The results showed that on the surface of thermo-diffusion coatings in the corrosion on media containing chloride ions, zinc hydroxychloride (simonkolleite - Zn₅Cl₂[OH]₈[H₂O]) has been formed. Compared to coatings obtained by other methods, the rate of simonkolleite formation was higher on TDZ coatings, which might have a positive effect on their resistance in aggressive atmospheres.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 1; 99-102
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Thermal Diffusion of 57Co into Rh Foil for Preparing Mössbauer Source

Autorzy:

Uhm, Y. R.
Kim, J. J.
Choi, S. M.
Son, K. J.

Powiązania:

https://bibliotekanauki.pl/articles/352775.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Mössbauer source
diffusion
electroplating
57Co/Rh

Opis:

To establish the coating conditions for ⁵⁷ Co, non-radioactive Co ions are dissolved in an acid solution and electroplated on to a rhodium plate. The thermal diffusion of electroplated Co into a rhodium matrix was studied to apply a ⁵⁷ Co Mössbauer source. The procedure to form a Co deposited onto Rh foil was established using two different electroplating baths: the acid-based buffer (pH 3) containing boric acid, sodium chloride, and saccharin, and the alkaline-based buffer (pH 10) containing hydrazine hydrate and ammonium citrate. The influence of different annealing conditions was investigated. From the results, the best diffusion degree of electrodeposited Co onto the rhodium matrix was obtained in an annealing process performed at 1100°C for 3 h in vacuum over 10^-5 hPa.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2B; 1249-1252
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Kinetic Monte Carlo study of structural proton diffusion along a one-dimensional path

Autorzy:

Masłowski, T.
Drzewiński, A.
Zubaszewska, M.

Powiązania:

https://bibliotekanauki.pl/articles/122324.pdf

Data publikacji:

2015

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

computational statistical mechanics
diffusion processes
procesy dyfuzyjne

Opis:

We study the structural diffusion coefficient of protons in a chain-like system by the means of KMC simulations. To perform specific calculations, we adopted parameter values in our model that correspond to the benzimidazole crystal. As we have shown, the structural diffusion follows the Arrhenius-like thermal dependence with an effective activation energy of 2.01 eV.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 3; 59-64
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Polynomial interpolation of the obtained depth of nitrogen diffusion on the surface of the plasma nitrided X5CrNi18-10 austenitic steel

Autorzy:

Ogórek, M.
Biernat, G.
Frączek, T.
Knapiński, M.

Powiązania:

https://bibliotekanauki.pl/articles/122457.pdf

Data publikacji:

2015

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

polynomial tensor interpolation
depth of nitrogen diffusion

Opis:

In the paper the polynomial tensor interpolation of the obtained results of the nitrogen diffusion depth on the surface of austenitic steel type 304 is presented.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 3; 79-85
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Effective diffusivity of moisture in low rank coal during superheated steam drying at atmospheric pressure

Autorzy:

Pakowski, Z.
Adamski, R.
Kwapisz, S.

Powiązania:

https://bibliotekanauki.pl/articles/185513.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

wilgoć
dyfuzja
węgiel brunatny
moisture
diffusion
lignite

Opis:

The effective diffusivity of water in brown coal of Bełchatów mine was experimentally determined. The experiments were performed in superheated steam at 200 [degrees]C and atmospheric pressure using slightly compressed pellets of cylindrical shape. The drying and temperature curves of the sample were used to identify diffusivity. An inverse problem was formulated and solved by the finite element method for 3D axially symmetric cylindrical geometry of the sample. A satisfactory fit of the simulated curves to experimental results was obtained. The obtained dependence of effective diffusivity on moisture content and temperature may be used in designing lignite dryers.

Źródło:

Chemical and Process Engineering; 2012, 33, 1; 43-51
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Liquefaction of saturated soil and the diffusion equation

Autorzy:

Sawicki, A.
Sławińska, J.

Powiązania:

https://bibliotekanauki.pl/articles/178612.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

liquefaction
diffusion equation
saturated soils
sea bed

Opis:

The paper deals with the diffusion equation for pore water pressures with the source term, which is widely promoted in the marine engineering literature. It is shown that such an equation cannot be derived in a consistent way from the mass balance and the Darcy law. The shortcomings of the artificial source term are pointed out, including inconsistencies with experimental data. It is concluded that liquefaction and the preceding process of pore pressure generation and the weakening of the soil skeleton should be described by constitutive equations within the well-known framework of applied mechanics. Relevant references are provided.

Źródło:

Studia Geotechnica et Mechanica; 2015, 37, 2; 39-44
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Fundamental solutions in the generalized theory of thermoelastic diffusion with triple porosity

Autorzy:

Kansal, Tarun

Powiązania:

https://bibliotekanauki.pl/articles/38912689.pdf

Data publikacji:

2023

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

thermoelastic diffusion
triple porosity
pores
steady oscillations

Opis:

The main aim of this paper is to derive the basic governing equations for an anisotropic thermoelastic medium with mass diffusion and triple porosity. Additionally, the fundamental solutions of a system of equations for steady, pseudo-, quasi-static oscillations and equilibrium are constructed.

Źródło:

Engineering Transactions; 2023, 71, 4; 473-505
0867-888X

Pojawia się w:

Engineering Transactions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Budowa i właściwości tribologiczne warstw duplex typu CrC+(Ni-W), wytwarzanych w procesie chromowania próżniowego połączonym z obróbką galwaniczną
Structure and tribological properties of duplex layers of the CrC+(Ni-W) type, produced by means of the vacuum chromizing process together with galvanic treatment

Autorzy:

Kasprzycka, E.M.
Senatorski, J.K.
Bogdański, B.B.

Powiązania:

https://bibliotekanauki.pl/articles/190514.pdf

Data publikacji:

2009

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

warstwy dyfuzyjne
właściwości tribologiczne
chromowanie dyfuzyjne
obróbka galwaniczna
diffusion layers
tribological properties
diffusion chromizing
galvanic treatment

Opis:

W pracy omówiono sposób wytwarzania warstw duplex typu CrC+(Ni-W) na powierzchni stali narzędziowej, stanowiący połączenie procesu chromowania próżniowego z obróbką galwaniczną. Wykonano pomiary grubości warstw, zbadano ich morfologię oraz wyznaczono rozkłady stężeń pierwiastków w strefie dyfuzyjnej tych warstw. Określono właściwości tribologiczne warstw. Stwierdzono, że odporność na zużycie przez tarcie warstw duplex typu CrC+(Ni-W) wytworzonych w procesie chromowania próżniowego na stali pokrytej powłoką elektrolityczną, jest porównywalna z odpornością warstw węglikowych typu CrC, wytwarzanych bez wstępnego osadzania powłoki elektrolitycznej.
In this paper, duplex layers of the CrC+(Ni-W) type produced on tool steel surface, in combined galvanic and vacuum chromizing processes, are investigated. Studies of layer thickness, their morphology, and concentration depth profiles of elements in diffusion zone of these layers have been carried out. Tribological properties of the layers have been determined. It has been proved, that the wear resistance by friction of duplex layers of the CrC+(Ni-W) type, produced by means vacuum chromizing of steel covered with electrolytic coating, is just as good as carbides layers of the CrC type, produced on the steel surface without electrolytic coatings.

Źródło:

Tribologia; 2009, 4; 69-77
0208-7774

Pojawia się w:

Tribologia

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 70.

Tytuł:

Heat path characterization of high-k HfO2-Ta2O5 capacitor in Verilog-A

Autorzy:

Masana, F. N.

Powiązania:

https://bibliotekanauki.pl/articles/398138.pdf

Data publikacji:

2011

Wydawca:

Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki

Tematy:

opór cieplny
ścieżka cieplna
dyfuzja
droga dyfuzji
efuzyjność
thermal impedance
heat path
diffusion
diffusion length
effusivity

Opis:

Thermal impedance measurement of semiconductor devices is one of the standard and well established methods of characterization. From such measurements can be obtained not only behavioral information in the form of graphs or models for thermal simulation, but also structural information about the thermal path involved, from source to sink, that can be very useful in device assembly process characterization and control. Structural information, however, usually requires many processing steps of measured data with its associated calculation burden and numerical errors. This work proposes a method to extract structural information from measured data in a straightforward way, with very few and elementary calculations, thus providing a useful analysis tool.

Źródło:

International Journal of Microelectronics and Computer Science; 2011, 2, 3; 100-104
2080-8755
2353-9607

Pojawia się w:

International Journal of Microelectronics and Computer Science

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 71.

Tytuł:

Transport of Organic Dyes in Systems Containing Humic Acids
Transport barwników organicznych w układach zawierających kwasy huminowe

Autorzy:

Rybarik, Jan
Sedlacek, Petr
Klucakova, Martina

Powiązania:

https://bibliotekanauki.pl/articles/318340.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

substancje humusowe
komórki dyfuzyjne
błękit metylenowy
związek jonowy
dyfuzja
humic substances
diffusion cells
methylene blue
ionic compound
diffusion

Opis:

This work is focused on transport organic dyes in systems containing humic acids as active reaction agent. Methylene blue was used as a model organic dye which can behave as pollutant and influence many processes in nature. Transport of pollutants in nature is strongly affected by interactions with humic acids or natural organic matter. Their influence is dependent on affinity of pollutant to content and strength of active binding sites. Two different humic samples are used in this study in order to compare their properties on transport of organic dye. Both humic acids are used in original extracted form as well as in the form of samples with selective blocked functional groups.
Niniejsza praca koncentruje się na transporcie barwników organicznych w systemach zawierających kwasy huminowe jako środek aktywny. Błękit metylenowy wykorzystano jako modelowy barwnik organiczny, który może zachowywać się jak substancja zanieczyszczająca i wpływać na wiele procesów w przyrodzie. Na transport zanieczyszczeń w przyrodzie silnie wpływają interakcje z kwasami huminowymi lub naturalną materią organiczną. Ich wpływ zależy od powinowactwa substancji zanieczyszczającej do zawartości i siły aktywnych miejsc wiązania. W badaniu tym zastosowano dwie różne próbki humusowe w celu porównania ich właściwości w transporcie barwnika organicznego. Oba kwasy humusowe stosuje się w oryginalnej postaci ekstrahowanej, jak również w postaci próbek z selektywnie zablokowanymi grupami funkcyjnymi.

Źródło:

Inżynieria Mineralna; 2019, 21, 1; 159-162
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Diffusion-weighted MRI of kidney in the diagnosis of clear cell renal cell carcinoma of various grades of differentiation

Autorzy:

Mytsyk, Y.
Dutka, I.
Komnastka, I.
Gorecki, A.
Yuriy, B.
Shatynska-Mytsyk, I.

Powiązania:

https://bibliotekanauki.pl/articles/3241.pdf

Data publikacji:

2015

Wydawca:

Instytut Medycyny Wsi

Tematy:

diffusion-weighted imaging
kidney
diagnosis
clear cell
renal cell
renal carcinoma
carcinoma
magnetic resonance imaging
apparent diffusion coefficient

Opis:

Introduction. Renal cell carcinoma (RCC) is the most common malignant epithelial tumour of the kidney, accounting for 85–90% of all solid renal tumours in adults and comprising 1–3% of all malignant visceral neoplasms. Recently, computed tomography (CT) has been considered the ‘gold standard’ in the diagnostic imaging of RCC; however, the use of CT is always associated with radiation exposure and consequently carries a significant increase in the risk of malignancy for patients with neoplastic processes. In recent years, magnetic resonance imaging (MRI) is increasingly attracting the attention of clinicians as the method of choice for the diagnosis and staging of RCC, due to several advantages over CT. Materials and method. The study involved 62 adult patients with a pathologically verified clear cell subtype of the renal cell carcinoma (ccRCC) and 15 healthy volunteers. All patients underwent renal MRI which included diffusion-weighted imaging (DWI) with subsequent apparent diffusion coefficient (ADC) measurement. Results. A significant difference was observed in the mean ADC value of the normal renal parenchyma and ccRCC – 1.82 ± 0.16 × 10– 3 mm2/s vs 2.15 ± 0.12 × 10– 3 mm2/s, respectively (р < 0,05). Additionally, statistically reliable differences in ADC values in patients with high and low ccRCC grades were obtained: in patients with the I grade, the mean ADC value was 1.92 ± 0.12 × 10– 3 mm2/s, in patients with the II grade, this value was 1.84 ± 0.14 × 10– 3 mm2/s, in patients with the III grade, the mean ADC value was 1.79 ± 0.12 × 10– 3 mm2/s, and in patients with the IV grade of nuclear polymorphism the mean ADC value was 1.72 ± 0.11 × 10– 3 mm2/s (p <0.05). Conclusions. The data obtained in the survey show a significant restriction in the diffusion of hydrogen molecules in tissues of ccRCC, compared to the healthy renal parenchyma due to the tumour’s greater density. A statistically significant difference was observed in the mean ADC values of ccRCC tumours with different Fuhrman nuclear grades: tumours with a low grade of differentiation demonstrated higher mean ADC values compared to highly differentiated tumours. Application of DWI modality of MR imaging with ADC calculation allows to obtain valuable information that is vital for the diagnosis of ccRCC and differentiation of its degree of malignancy.

Źródło:

Journal of Pre-Clinical and Clinical Research; 2015, 09, 1
1898-2395

Pojawia się w:

Journal of Pre-Clinical and Clinical Research

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 73.

Tytuł:

Applications of the fractional Sturm-Liouville difference problem to the fractional diffusion difference equation

Autorzy:

Malinowska, Agnieszka B.
Odzijewicz, Tatiana
Poskrobko, Anna

Powiązania:

https://bibliotekanauki.pl/articles/24200687.pdf

Data publikacji:

2023

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

anomalous diffusion
fractional diffusion equation
fractional calculus
difference equation
dyfuzja anomalna
równanie dyfuzji ułamkowe
rachunek ułamkowy
równanie różnicowe

Opis:

This paper deals with homogeneous and non-homogeneous fractional diffusion difference equations. The fractional operators in space and time are defined in the sense of Grünwald and Letnikov. Applying results on the existence of eigenvalues and corresponding eigenfunctions of the Sturm-Liouville problem, we show that solutions of fractional diffusion difference equations exist and are given by a finite series.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2023, 33, 3; 349--359
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Generating urban structures: a method for urban planning supported by multi-agent systems and cellular automata
Generowanie struktur urbanistycznych: metoda planowania urbanistycznego wspomagana przez systemy wieloagentowe i automaty komórkowe

Autorzy:

Koenig, R.

Powiązania:

https://bibliotekanauki.pl/articles/369525.pdf

Data publikacji:

2011

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

systemy wieloagentowe (MAS)
automaty komórkowe (CA)
generatywne systemy projektowania
diffusion limited aggregation (DLA)
diffusion-contact model
modelowanie urbanistyczne
multi-agent systems
cellular automata
generative design system
diffusion limited aggregation
urban modeling

Opis:

This work is based on the concept that the structure of a city can be defined by six basic urban patterns. To enable more complex urban planning as a long-term objective I have developed a simulation method for generating these basic patterns and for combining them to form various structures. The generative process starts with the two-dimensional organization of streets followed by the parceling of the remaining areas. An agent-based diffusion-contact model is the basis of these first two steps. Then, with the help of cellular automata, the sites for building on are defined and a three-dimensional building structure is derived. I illustrate the proposed method by showing how it can be applied to generate possible structures for an urban area in the city of Munich.
Artykuł bazuje na założeniu, że struktura miasta może być zdefiniowana poprzez sześć podstawowych typów układów urbanistycznych. W celu umożliwienia bardziej kompleksowego planowania urbanistycznego, jako cel długoterminowy, Autor opracował metodę symulacyjną do generowania tych podstawowych układów i do przetwarzaniach ich w różne struktury urbanistyczne. Proces generatywny rozpoczyna się od dwuwymiarowej organizacji ulic oraz parcelacji wolnych obszarów. Dla realizacji tych dwóch pierwszych etapów podstawą jest odpowiedni system wieloagentowy. Następnie, z pomocą metody automatów komórkowych, wyznaczane są miejsca posadowienia budynków i tworzona jest przestrzenna struktura zabudowy. Zastosowanie proponowanej metody zostało tu zilustrowane na przykładzie symulacji dla obszaru zurbanizowanego miasta Monachium.

Źródło:

Przestrzeń i Forma; 2011, 16; 353-376
1895-3247
2391-7725

Pojawia się w:

Przestrzeń i Forma

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Dwa typy dyfuzji innowacji i ich ontologiczne założenia
The two types of diffusion of innovations and their ontological assumptions

Autorzy:

Mikołajec, J.

Powiązania:

https://bibliotekanauki.pl/articles/326885.pdf

Data publikacji:

2014

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

dyfuzja innowacji
dyfuzjonizm
przestrzeń geograficzna
dyfuzja międzykulturowa
system społeczny
diffusion of innovations
diffusionism
geographical space
cultural diffusion
social system

Opis:

Istnieją dwie koncepcje dyfuzji innowacji o odrębnych założeniach ontologicznych i konsekwencjach historiozoficznych. Tradycyjny dyfuzjonizm w antropologii na przełomie XIX i XX wieku był związany z wielokulturowością. Nowoczesna teoria dyfuzji innowacji zakłada istnienie pojedynczej kultury.
There are two conceptions of innovations diffusion having separate ontological foundations and historiosophical consequences. Traditional diffusionism in anthropology at the turn of the 19th and 20th centuries was related to multiculturalism. The modern theory of the innovations diffusion assumes the existence of a single culture.

Źródło:

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2014, 72; 125-134
1641-3466

Pojawia się w:

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 76.

Tytuł:

New instruments and methods for analysing the coal-methane system

Autorzy:

Skoczylas, N.
Kudasik, M.
Wierzbicki, M.
Murzyn, T.

Powiązania:

https://bibliotekanauki.pl/articles/178335.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

desorption
methane
carbon dioxide
coal
outburst
diffusion

Opis:

The authors of the present paper designed and constructed a prototype of an instrument which enables fully automated determination of the desorbable methane content and effective diffusion coefficient in underground conditions. Due to microprocessor analysis of the recorded data and the application of the mathematical model of the diffusion process, it is possible to automatically determine the amount of methane whose release from a coal sample occurred before the sample was placed within a measuring instrument. It is also possible to carry out follow-up extrapolation of the recorded data so the time duration needed to determine reliable results can be reduced. The instrument was tested and optimized, and a number of copies sufficient for performing underground tests were constructed. The concept of the instrument represents a totally new approach to the observation of gas release from a coal sample. Instead of short-period measurements, virtually the whole process of methane release from coal is registered and analysed. This is possibly due to the use of a grain fraction lower than one mm which is presently applied for the sake of evaluating the methane- bearing capacity and desorption intensity.

Źródło:

Studia Geotechnica et Mechanica; 2015, 37, 1; 85-91
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Statistical properties of a polymer chain in the environment with low concentration of nanoparticles

Autorzy:

A. Tsehay, Dessalegne
Luo, Meng-Bo

Powiązania:

https://bibliotekanauki.pl/articles/1050809.pdf

Data publikacji:

2018-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

diffusion
conformation
polymer chain
nanoparticles
molecular dynamics

Opis:

We have investigated the statistical properties of polymer in the environment with low concentration of nanoparticles by using large-scale molecular dynamics simulations. The scaling law for the mean square radius of gyration was examined and simulation results for the polymer lengths 64≤N≤144 yielding a reasonably accurate value of the Flory exponent ν=0.58 at weak polymer-nanoparticle interaction ε_{PN}. Within the same range of N, the mean asphericity of the chain is independent of N. We found that the polymer behaves like a self-avoiding walk chain at small ε_{PN} and a compact sphere at large ε_{PN}. The results are attributed to the increase in the contact between polymer and nanoparticles with increasing ε_{PN}. Normal diffusions of polymer are always observed at whatever ε_{PN} and size and concentration of nanoparticles. Our result shows that the normal diffusion behavior of polymer is independent of polymer's state even though there is a phase transition from a desorbed polymer phase at small ε_{PN} to an adsorbed polymer phase at large ε_{PN}.

Źródło:

Acta Physica Polonica A; 2018, 133, 5; 1274-1280
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Diffusion of Cd(II), Pb(II) and Zn(II) on calcium alginate beads

Autorzy:

Kwiatkowska-Marks, Sylwia
Miłek, Justyna
Trawczyńska, Ilona

Powiązania:

https://bibliotekanauki.pl/articles/297886.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

effective diffusion
alginate beads
cadmium
lead
zinc

Opis:

Effective diffusion coefficients (De) for different heavy-metal salts: Cd, Pb, Zn in calcium alginate beads were determined. Their values depend on the metal type, anion from the metal salt, and the alginate content in the beads. The results of calculations indicate a decrease in the values of De, caused by an increase in the alginate content in the alginate sorbent beads. This is in agreement with the mechanism of the diffusion process taking place in porous carriers. Experimental data were found to be in good agreement with the mathematical model, as indicated by high values of the correlation coefficient.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(1); 19-34
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Echoes and glimpses of a distant drum

Autorzy:

Turner, John Wm.

Powiązania:

https://bibliotekanauki.pl/articles/1397342.pdf

Data publikacji:

2021

Wydawca:

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

Tematy:

Kac drum problem
inverse methods
diffusion process

Opis:

To what extent does the spectrum of the Laplacian operator on a domain D with prescribed boundary conditions determine its shape? This paper first retraces the history of this problem, then Kac’s approach in terms of a diffusion process with absorbing boundary conditions. It is shown how the restriction to a polygonal boundary for D in this method, which required taking the limit of an infinite number of sides to obtain a smooth one, can be avoided by using the Duhamel method.

Źródło:

Opuscula Mathematica; 2020, 40, 6; 737-750
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

A comparison of oxygen diffusion rates in sand moistened with water or PEG 20000 solution

Autorzy:

Hiller, S.
Dexter, A.R.

Powiązania:

https://bibliotekanauki.pl/articles/24419.pdf

Data publikacji:

1997

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

sand
air
oxygen diffusion
polyethylene glycol
water

Źródło:

International Agrophysics; 1997, 11, 3
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

The Ni-Al-Hf Multiphase Diffusion

Autorzy:

Romanowska, J.
Wierzba, B.
Markowski, J.
Zagula-Yavorska, M.
Sieniawski, J.

Powiązania:

https://bibliotekanauki.pl/articles/356143.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

NiAlHf system
reactive diffusion
simulation
aluminide coatings

Opis:

The generalized Darken method was applied to simulate the diffusion between γ-Ni| γ’-Ni₃Al and γ’-Ni₃Al|β-NiAl interfaces. The results of calculations were compared with the experimental concentration’s profiles of nickel, aluminum and hafnium in aluminide and hafnium doped aluminide coatings deposited by the CVD and PVD methods on pure nickel. The method deals with the Wagner’s integral diffusion coefficients and thermodynamic data - activities of components. The experimental results agree with the simulated ones.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 587-592
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Spontaneous Formation of Titanium Nitride on the Surface of a Ti Rod Induced by Electro-Discharge-Heat-Treatment in an N2 Atmosphere

Autorzy:

Lee, W. H.
Yoon, Y. H.
Kim, Y. H.
Lee, Y. K.
Kim, J. Y.
Chang, S. Y.

Powiązania:

https://bibliotekanauki.pl/articles/352477.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

titanium
surface modification
diffusion
heat treatment
XPS

Opis:

A single pulse of 2.0 to 3.5 kJ of input energy from a 450 mF capacitor was applied to a commercially pure Ti rod in a N₂ atmosphere. The surface of the Ti rod transformed from TiO₂ into titanium nitride in times as short as 159 msec, providing a bimodal morphology of the cross-section. A much higher value of hardness that was observed at the edge of the cross-section was attributed to nitrogen-induced solid-solution hardening that occurred during the electrical discharge process. The activation energy (E_a) for the diffusion process was estimated to be approximately 86.9 kJ/mol. Results show that the electrical discharge process is a possible potential method for the nitriding of Ti; advantages include a short processing time and control of the nitrided layer without dimensional changes.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2B; 1281-1285
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Recent Developments on Discontinuous Precipitation

Autorzy:

Zięba, P.

Powiązania:

https://bibliotekanauki.pl/articles/353282.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

discontinuous precipitation
discontinuous coarsening
grain boundary diffusion

Opis:

The discontinuous precipitation (DP) belongs to a group of diffusive solid state phase transformations during which the formation of a new phase is heterogeneous and limited to a migrating reaction front (RF). The use of analytical electron microscopy provided reliable information that there is no differences in the diffusion rate at the stationary grain boundary and moving RF of DP reaction. On the other hand, the use of “in situ” transmission electron microscopy observations indicated the importance of stop- go motion or oscillatory movement of the RF. During 2004-2016 period more or less 280 papers were published in which the terms “discontinuous precipitation, “cellular precipitation”, discontinuous coarsening” appeared either in the abstract or in key-words. In the present contribution, the research on the DP reaction will be reviewed taking into account new aspects of theories and modelling, new evidences and findings, effect of various factors including third element, external stresses, plastic deformation and GB orientation, occurrence in less known systems and alloys like: superalloys, nitrided Fe-based alloys and Cu-based alloys. Finally, some suggestions for the future research will be formulated.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2A; 955-968
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Globalna fala protestu i rewolucji: przyczyny, cele, dyfuzja
The global wave of protest and revolution: causes, goals, diffusion

Autorzy:

Chodak, Jarosław

Powiązania:

https://bibliotekanauki.pl/articles/561448.pdf

Data publikacji:

2016-12-31

Wydawca:

Collegium Civitas

Tematy:

protest
rewolucja
dyfuzja
mobilizacja
revolution
diffusion
mobilization

Opis:

Globalną falę protestów i rewolucji, której punktem kulminacyjnym był rok 2011, można uznać za zjawisko o wielorakich konsekwencjach geopolitycznych, społecznych i kulturowych. Celem artykułu jest analiza głównych przyczyn mobilizacji, celów protestujących oraz mechanizmów globalnego rozprzestrzeniania się podobnych repertuarów kontestacji, ram interpretacyjnych, symboli, i sloganów. Refleksja zawarta w artykule obejmuje elementy analizy porównawczej, której celem jest uchwycenie głównych mechanizmów przyczynowych. W procesie wyjaśniającym odwołuję się do koncepcji dyfuzji, kultury światowej oraz analizy ramowej. Efektem są generalizacje historyczne na temat głównych mechanizmów dynamiki współczesnej mobilizacji globalnej.
Global wave of protests and revolutions, which climaxed in 2011, can be considered as the phenomenon of multiple geopolitical, social and cultural consequences. The purpose of the article is to analyze the main causes of the mobilization, goals of the protesters and mechanisms of the global spread of similar repertoires of contestation, interpretative frames, symbols and slogans. Reflection presented in the paper includes elements of the comparative analysis, the aim of which is to capture the major causal mechanisms. I referred to the concept of the diffusion, the world culture and frame analysis. Historical generalizations about the main mechanisms of the dynamics of contemporary global mobilization is the result.

Źródło:

Zoon Politikon; 2016, 7; 35-56
2543-408X

Pojawia się w:

Zoon Politikon

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Computing Reverberation Time in a 3D Room Model Using a Finite Difference Method Applied for the Diffusion Equation

Autorzy:

Kraszewski, J.

Powiązania:

https://bibliotekanauki.pl/articles/177730.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

diffusion method
reverberation time
finite differences method

Opis:

The article presents theoretical values of reverberation times calculated on the basis of the diffusion equation for three room models: flat, cubic, and long. The article shows that not only the average absorp- tion coefficient, but also location of the absorbent material, as well as the place where the time is counted have an impact on the reverberation time, calculated on the basis of the diffusion equation. Despite that, the diffusion model is based on statistical assumptions. The primary goal of the article was to show that the model has geometrical features.

Źródło:

Archives of Acoustics; 2012, 37, 2; 171-180
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Pollution in Shatt Al-Arab River near Hospital Wastewater Disposal – Detection of Pharmaceutical Compounds, Isolation and Identification of Drug-Resistant Bacteria

Autorzy:

Alsaad, Noor Kadhim
Almansoory, Asia Fadhile
Al-Baldawi, Israa Abdulwahab

Powiązania:

https://bibliotekanauki.pl/articles/2202283.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

resistant bacteria
well diffusion
river
pharmaceutical
micropollutants

Opis:

Pharmaceutical compounds have been introduced into the aquatic ecosystems in multiple ways and sources, which negatively affects the health of the environment and humans. The river near the hospital sewage disposal is host environment for drug-resistant bacteria (DRB). In this context, the aim of the research was to detect the presence of pharmaceuticals in hospital wastewater, after treatment, at river point followed by isolation of bacteria and test for resistant pharmaceutical compound. Fifteen species of bacteria isolated by angiogenic methods were identified and tested using the well diffusion test to determine the resistance of selected bacteria to ibuprofen by survival assessment. This study showed that the ibuprofen detected by GC-mass was available in all selected points at a concentration of 3 to 120 mg/L. Lecuco. mesen.cremris and Koc.rosea have a high ability to break down the ibuprofen compound. Thus, the bacteria isolated from hospital wastewater can biologically degrade ibuprofen.

Źródło:

Journal of Ecological Engineering; 2022, 23, 12; 29--36
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

Uzasadnienie potrzeby badań nad innowacyjnością w logistyce z wykorzystaniem modeli dyfuzyjnych
The reasons of innovation in logistic research with the use of diffusion models

Autorzy:

Jagodziński, Jacek
Ostrowski, Damian

Powiązania:

https://bibliotekanauki.pl/articles/540994.pdf

Data publikacji:

2013

Wydawca:

Wyższa Szkoła Bankowa we Wrocławiu

Tematy:

logistyka
modele dyfuzyjne
innowacyjność
logistics
diffusion models
innovation

Opis:

W dobie gospodarki opartej na wiedzy coraz większą rolę odgrywa innowacyjność. Podstawą opracowania są badania empiryczne związane z diagnozą skali i potrzeb innowacyjności modeli dyfuzyjnych w kontekście ich wpływu na postrzeganie innowacyjności.
In the era of knowledge economy a growing role of innovation is observed. The basis for this paper is empirical research related to the diagnosis of the scale and the needs of innovation in logistic companies operating in Lower Silesia. The purpose of this article is to present the models of diffusion in the context of their impact on perceptions of innovation.

Źródło:

Zeszyty Naukowe Wyższej Szkoły Bankowej we Wrocławiu; 2013, 5(37); 89-102
1643-7772

Pojawia się w:

Zeszyty Naukowe Wyższej Szkoły Bankowej we Wrocławiu

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

Lean Management Concept in the Environment of Cluster Enterprises

Autorzy:

Pawłyszyn, Irena

Powiązania:

https://bibliotekanauki.pl/articles/503682.pdf

Data publikacji:

2017

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

clusters
cluster enterprises
Lean Management
diffusion of knowledge

Opis:

Increasing regional and local policy, aimed at boosting the competitiveness of regions and provinces is now becoming a common practice in the globalized economy. Therefore, in this article an important segment of the market is analyzed, which is regarded not only as a tool for enhancing the competitiveness of individual companies, but also of entire economies, namely - industrial clusters. The main research problem of this article was to determine if cluster enterprises are familiar with the Lean Management concept and if they practice it. The aim of the studies included in the paper was to identify the scope of usage of the Lean Management concept among cluster enterprises. At the same time within the study it was identified whether between businesses practicing the above-mentioned concept, there is any information exchange – any diffusion of knowledge.

Źródło:

Logistics and Transport; 2017, 36, 4; 43-56
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Reflection of plane waves from a free surface of a generalized magneto-thermoelastic solid half-space with diffusion

Autorzy:

Singh, B.
Singh, L.
Deswal, S.

Powiązania:

https://bibliotekanauki.pl/articles/282051.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

generalized thermoelasticity
plane waves
reflection
magnetic field
diffusion

Opis:

Green-Naghdi’s theory of generalized thermoelasticity is applied to study the reflection of P and SV waves from the free surface of a magneto-thermoelastic solid half-space. The boundary conditions are satisfied by appropriate potential functions to obtain a system of four non-homogeneous equations in reflection coefficients. The reflection coefficients depend upon the angle of incidence of P and SV waves, magnetic field, thermal field, diffusion parameters and other material constants. The numerical values of the modulus of the reflection coefficients are shown graphically with the angle of incidence of P and SV waves. The effect of magnetic field is observed significantly on various reflected waves.

Źródło:

Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 385-394
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Commercialization of high-tech products: theoretical-methodological aspects

Autorzy:

Shpak, N.
Knyaz, S.
Myroshchenko, N.
Kolomiyets, O.

Powiązania:

https://bibliotekanauki.pl/articles/411255.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Oddział w Lublinie PAN

Tematy:

commercialization
high-tech product
diffusion
effectiveness
innovativeness
evaluation

Opis:

Based on theoretical knowing of modern, economic concepts of innovation, systems theory, management and information and also on the practice of their using in the management system of enterprises, in this case was proposed a new solution of scientific problems. It was the development of theoretical and methodical applied principles concerning the commercialization of high-tech products industry.

Źródło:

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2014, 3, 1; 81-88
2084-5715

Pojawia się w:

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

A Neumann problem for a convection-diffusion equation on the half-line

Autorzy:

Biler, Piotr
Karch, Grzegorz

Powiązania:

https://bibliotekanauki.pl/articles/1207965.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

Neumann problem
asymptotics of solutions.
convection-diffusion equation

Opis:

We study solutions to a nonlinear parabolic convection-diffusion equation on the half-line with the Neumann condition at x=0. The analysis is based on the properties of self-similar solutions to that problem.

Źródło:

Annales Polonici Mathematici; 2000, 74, 1; 79-95
0066-2216

Pojawia się w:

Annales Polonici Mathematici

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Growth pole theory as a concept based on innovation activity development and knowledge diffusion

Autorzy:

Wojnicka-Sycz, Elżbieta

Powiązania:

https://bibliotekanauki.pl/articles/1831421.pdf

Data publikacji:

2013

Wydawca:

Politechnika Gdańska

Tematy:

growth pole theory
development factors
innovation
knowledge diffusion

Opis:

Innovation activity and knowledge diffusion are key development factors in territorial growth poles and crucial, but not enough stressed in the original growth pole theory. In the article thoughts of the authors of the original growth pole theory connected with knowledge and innovation are presented. The original theory is than adjusted to the modern requirements of the knowledge based economy by presentation of the model of territorial growth pole as a system of development factors and analysis of the real impact of theoretical development factors on economic growth based on literature review.

Źródło:

Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka; 2013, 3, 6; 17-33
2084-6495

Pojawia się w:

Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Molecular dynamics study of temperature-induced structural changes in YBa2Cu3O7 crystal

Autorzy:

Bośko, J.
Sadowski, W.

Powiązania:

https://bibliotekanauki.pl/articles/1954521.pdf

Data publikacji:

1999

Wydawca:

Politechnika Gdańska

Tematy:

MD simulations
structure
phase transition
oxygen diffusion
trajectory

Opis:

The structure of YBa2Cu3O7 crystal has been studied with the aid of molecular-dynamics (MD) technique. A two-body model potentials proposed by Zhang and Catlow have been used in MD simulations performed in wide range of temperature. The temperature-induced orthorhombic-to-tetragonal phase transition is observed. The distruction of the arrangement of atoms in the CuO chains due to diffusion of oxygen atoms is observed. The diffusion coefficients are calculated, and their variation as a function of temperature is analysed. The activation energy is estimated.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 3; 293-302
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 94.

Tytuł:

Liposomy jako nośniki substancji aktywnych przenoszonych w głąb skóry
Liposomes as carriers for the delivery of active substances to the skin

Autorzy:

Goik, U.
Załębska-Żyłka, I.
Pietrzycka, A.

Powiązania:

https://bibliotekanauki.pl/articles/286040.pdf

Data publikacji:

2015

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

liposomy
stratum corneum
dyfuzja przezskórna
liposomes
transdermal diffusion

Opis:

Od bardzo dawna skóra jest miejscem aplikacji kosmetyków i leków dermatologicznych. Obecnie można zauważyć coraz większe zainteresowanie preparatami aplikowanymi na skórę w celu leczenia, czy uzyskania dobrego efektu kosmetycznego. Działanie leków podawanych na powierzchnię skóry nie ogranicza się tylko do jej obszarów, ale dzięki wchłanianiu substancji leczniczych przez nią lek może dotrzeć do głębiej położonych tkanek lub do krwiobiegu. Podobnie preparaty kosmetyczne mogą działać w obrębie warstw naskórka jak również skóry właściwej oraz przedostawać się do krwiobiegu. Liposomy są to pęcherzyki, które otoczone są podwójną warstwą lipidową. Powstają one samoistnie z fosfolipidów w środowisku wodnym i są wypełnione niewielką ilością roztworu wodnego, z którego powstają. Posiadają wiele pozytywnych właściwości na przykład: mogą przenosić zarówno wodę jak i rozpuszczalne w lipidach leki, mogą zawierać micro i makro molekuły, zapewniają długotrwałe uwalnianie i ukierunkowane dostarczanie leku oraz docelowe dostarczenie leku w środowisku nieprzyjaznym, stabilizują biodegradowalne leki i związki aktywne zapewniając ochronę przed utlenianiem, poprawiają stabilizację protein i mogą być aplikowane do organizmu poprzez wiele dróg dostarczania. Liposomy znalazły swoje zastosowanie w wielu dziedzinach, takich jak biotechnologia, mikrobiologia oraz w przemyśle kosmetycznym, farmaceutycznym i spożywczym. Ponadto osiągnięcia nanomedycyny są przełomowe w przenoszeniu leków, a wszechstronność liposomów spowodowała wzrost ich użycia w wielu dziedzinach medycyny, takich jak diagnoza i terapia.
Since ancient times cosmetics and dermatological medicines have been applied to the skin. Presently growing interest in topical administration in order to achieve therapeutic or good cosmetic effects can be noticed. Effectiveness of medicines topically applied is not limited only to the skin, but due to the absorption of medical substances, the drug can reach subdermal tissues or circulatory system. Similarly, active substances in cosmetic can act both within epidermis and dermis layers, and can enter the bloodstream. Liposomes are vesicles which are surrounded by a lipid bilayer. They are created spontaneously from phospholipids in aqueous environment and they are filled with a small amount of aqueous solution of hydrophilic active substances. Incorporation of micro and macro molecules in liposomes provides stabilization, constant release during the time unit and targeted drug delivery in hostile environment. Biodegradable drugs protected from oxidation improve protein stabilization and can be administered through various routes. Liposomes are used in numerous applications, including cosmetics and biotechnology, microbiology, and also pharmaceutical and food industry. Moreover, nanomedicine developments are crucial for carrying drugs, and liposomes versatility leads to increase in their application in medical fields, like diagnosis and therapy.

Źródło:

Engineering of Biomaterials; 2015, 18, 130; 27-39
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Zwiększenie selektywności rozdziału mieszanin ciekłych w procesie destylacji dyfuzyjnej
Increase of binary mixture separation selectivity in diffusion distillation

Autorzy:

Ziobrowski, Z.
Krupiczka, R.
Rotkegel, A.

Powiązania:

https://bibliotekanauki.pl/articles/2072067.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

destylacja dyfuzyjna
odparowanie
kondensacja
diffusion distillation
evaporation
condensation

Opis:

Przedstawiono wyniki badań rozdziału mieszanin ciekłych w zintegrowanym procesie odparowania i kondensacji fi lmu cieczy spływającej po ściance rury pionowej w obecności inertów w fazie gazowej oraz ciekłej. Otrzymano znaczny wzrost selektywności rozdziału mieszaniny ciekłej przy dużej zawartości inertu w fazie ciekłej (glikol). Mierzone wartości strumieni masowych rosną z temperaturą odparowania i maleją ze wzrostem zawartości inertu w fazie ciekłej.
Separation of binary liquid mixtures by diffusion distillation was investigated. Experiments were performed in a wetted wall column in the presence of inerts in gas and liquid phase. Increase of selectivity was obtained for a higher inert concentration in liquid phase (glycol). Measured mass fl uxes increased with the increase of evaporation temperature and decreased with the rise of inert concentration in liquid phase.

Źródło:

Inżynieria i Aparatura Chemiczna; 2014, 1; 48--50
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

Chemical composition and properties of spray-dried sugar beet concentrate obtained after ultrafiltration of diffusion juice

Autorzy:

Regiec, P.
Kita, A.
Boruczkowska, H.
Drożdż, W.

Powiązania:

https://bibliotekanauki.pl/articles/779047.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

ceramic membrane
ultrafiltration
diffusion juice
concentrate
spray drying

Opis:

Ultrafiltration of diffusion juice is a method that can reduce environmental pollution during the production of sugar. A by-product (concentrate) of ultrafiltration contains a large amount of sucrose, but due to its properties, it is difficult to manage. The aim of this study was to determine the effects of the temperature used during drying of diffusion juice concentrates on the content of certain components and characteristics of resultant preparations. Diffusion juice obtained from one of the Polish sugar plants was subjected to ultrafiltration and the obtained concentrates were dried in a spray dryer. In the dried samples, the following parameters were analyzed: dry mass, sucrose, total ash, protein, crude fiber and color. It has been declared that the degree of concentration and drying temperature influenced the chemical composition and the properties of the dehydrated diffusion juice concentrates. An increase in drying temperature was accompanied by the increased content of dry mass, protein, ash and fiber content in the preparations. The greater the degree of juice concentration, the greater was the content of dry mass, ash, and fiber. Inversely, the greater the degree of juice concentration, the lower the content of sucrose. The brightest color of the dehydrated product was observed at the drying temperature of 200°C. Spray-drying may be used for waste management after the diffusion juice membrane filtration, and the resultant preparations might be used in the production of feedstuff or food industry in general e.g. as sucrose source, in fermentation processes or in microorganisms propagation.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 1; 134-137
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Microstructure and Mechanical Properties of Joints of Titanium with Stainless Steel Performed using Nickel Filler

Autorzy:

Szwed, B.
Konieczny, M.

Powiązania:

https://bibliotekanauki.pl/articles/357024.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

diffusion brazing; titanium
stainless steel
microstructure
mechanical properties

Opis:

Diffusion brazing was performed between titanium (Grade 2) and stainless steel (X5CrNi18-10) using as a filler a nickel foil at the temperatures of 850, 900, 950 and 1000°C. The microstructure was investigated using light microscopy and scanning electron microscopy equipped with an energy dispersive X-ray system (EDS). The structure of the joints on the titanium side was composed of the eutectoid mixture αTi+Ti₂Ni and layers of intermetallic phases Ti₂Ni, TiNi and TiNi₃. The stainless steel-nickel interface is free from any reaction layer at 850°C, above this temperature thin layer of reaction appears. The microhardness measured across the joints reaches higher values than for titanium and stainless steel, and it achieves value from 260 to 446 HV. The highest shear strength (214 MPa) was achieved for joints brazed at 900°C.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2B; 997-1001
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 98.

Tytuł:

Image encryption based on permutation polynomials over finite fields

Autorzy:

Wu, Jianhua
Liu, Hai
Zhu, Xishun

Powiązania:

https://bibliotekanauki.pl/articles/1835797.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

finite field
permutation polynomials
scrambling
diffusion
image encryption

Opis:

In this paper, we propose an image encryption algorithm based on a permutation polynomial over finite fields proposed by the authors. The proposed image encryption process consists of four stages: i) a mapping from pixel gray-levels into finite field, ii) a pre-scrambling of pixels’ positions based on the parameterized permutation polynomial, iii) a symmetric matrix transform over finite fields which completes the operation of diffusion and, iv) a post-scrambling based on the permutation polynomial with different parameters. The parameters used for the polynomial parameterization and for constructing the symmetric matrix are used as cipher keys. Theoretical analysis and simulation demonstrate that the proposed image encryption scheme is feasible with a high efficiency and a strong ability of resisting various common attacks. In addition, there are not any round-off errors in computation over finite fields, thus guaranteeing a strictly lossless image encryption. Due to the intrinsic nonlinearity of permutation polynomials in finite fields, the proposed image encryption system is nonlinear and can resist known-plaintext and chosen-plaintext attacks.

Źródło:

Optica Applicata; 2020, 50, 3; 357-376
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Psychological practice should not be disjoined from theory or lag behind good research

Autorzy:

Caprara, Gian Vittorio

Powiązania:

https://bibliotekanauki.pl/articles/2128051.pdf

Data publikacji:

2019-04-04

Wydawca:

Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL

Tematy:

diffusion of knowledge
assessment of research and practice

Opis:

There is substantial agreement on the relevance of the questions raised by Jerzy M. Brzeziński and on the proposed answers. The common use of English in international scientific communication should not lead to neglecting the proper media of diffusing psychological knowledge in local languages. The current concern for assessing the quality of psychological research and research institutions should be accompanied by an equal concern for proper criteria to assess the quality of psychological practice and of practitioner education. The criteria of evaluating both research and practice should be grounded on solid psychological theories.

Źródło:

Roczniki Psychologiczne; 2014, 17, 3; 521-524
1507-7888

Pojawia się w:

Roczniki Psychologiczne

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 100.

Tytuł:

Dynamics, control, stability, diffusion and synchronization of modified chaotic Colpitts oscillator

Autorzy:

Rasappan, Suresh
Niranjan Kumar, K. A.

Powiązania:

https://bibliotekanauki.pl/articles/1845536.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

chaos
Colpitts oscillator
Lyapunov exponent
diffusion
stability
synchronization

Opis:

The purpose of this paper is to introduce a new chaotic oscillator. Although different chaotic systems have been formulated by earlier researchers, only a few chaotic systems exhibit chaotic behaviour. In this work, a new chaotic system with chaotic attractor is introduced. It is worth noting that this striking phenomenon rarely occurs in respect of chaotic systems. The system proposed in this paper has been realized with numerical simulation. The results emanating from the numerical simulation indicate the feasibility of the proposed chaotic system. More over, chaos control, stability, diffusion and synchronization of such a system have been dealt with.

Źródło:

Archives of Control Sciences; 2021, 31, 3; 731-759
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

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