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Tytuł:
Uwarunkowania polskiej polityki gospodarczej po roku 2022
Determinants of the Polish economic policy after 2022
Autorzy:
Banaszyk, Piotr
Gorynia, Marian
Powiązania:
https://bibliotekanauki.pl/articles/2120166.pdf
Data publikacji:
2022-06-30
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Polish economy
economic policy in Poland
determinants of economic activity in the world
JEL codes: B10, E02, F20, F40, F60
polska gospodarka
polityka gospodarcza w Polsce
uwarunkowania działalności gospodarczej na świecie
JEL: B10, E02, F20, F40, F60
Opis:
W artykule skupiono się na wskazaniu pożądanych kierunków polityki gospodarczej w Polsce na tle jej potencjału i aktualnych uwarunkowań. Założono, że stan polskiej gospodarki jest zdeterminowany współoddziaływaniem procesów transformacji, globalizacji i integracji europejskiej. Ostatnie chronologicznie determinanty tego stanu to kryzys wywołany pandemią COVID-19 oraz agresja wojenna Rosji na Ukrainę. Wydarzenia te stworzyły zagrożenie stagflacją. Rosnące znaczenie Chin i wojna handlowa tego państwa z USA wraz z rosyjską agresją kruszą dotychczasowy międzynarodowy ład ekonomiczny. Procesy te zmieniają sytuację i perspektywy polskiej gospodarki, której sternicy powinni na nowo zdefiniować jej miejsce w nowym międzynarodowym ładzie gospodarczym, stopniowo wyłaniającym się pod wpływem tych wszystkich okoliczności. Niewiadomą jest finalny obraz następnej rzeczywistości gospodarczej. Jednak warto już teraz dążyć do włączenia polskich przedsiębiorstw w europejskie i światowe łańcuchy dostaw dzięki modernizacji technologicznej ich działalności. W obszarze polityki fiskalnej zamiast konkurować coraz niższymi stawkami i obciążeniami podatkowymi warto rozbudowywać infrastrukturę i instytucje publiczne. W odniesieniu do polityki monetarnej z powodu nieuchronnego wzrostu ryzyka ekonomicznego inwestycji zagranicznych w Polsce warto przyjąć euro i dzięki temu stworzyć bezpieczną perspektywę rozwoju gospodarczego.
The article focuses on indicating the desired directions of economic policy in Poland against the background of its potential and current conditions. It is assumed that the current condition of the Polish economy was determined by the interaction of the processes of transformation, privatization, globalization and European integration. The last chronological determinants of this state are the crisis caused by the COVID-19 pandemic and Russia’s military aggression against Ukraine. These impacts created the threat of stagflation. The growing importance of China and the trade war between that country and the US, together with Russian aggression, are crushing the current international economic order. These processes are changing the situation and prospects of the Polish economy, whose managers should redefine its place in the new international economic order that is gradually emerging under the influence of all these circumstances. The final picture of the next economic reality is unknown. However, it is worth striving to include Polish enterprises in European and global supply chains thanks to the technological modernization of their activities. In the area of fiscal policy, instead of competing with ever lower tax rates, it is worth developing public infrastructure and institutions. With regard to monetary policy, due to the inevitable increase in the economic risk of foreign investments in Poland, it will be a good idea to adopt the euro and thus create a safe prospect for economic development.
Źródło:
Ruch Prawniczy, Ekonomiczny i Socjologiczny; 2022, 84, 2; 149-161
0035-9629
2543-9170
Pojawia się w:
Ruch Prawniczy, Ekonomiczny i Socjologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crises as impulses for changes in socio-economic systems
Kryzysy jako impulsy zmian systemów społeczno-gospodarczych
Autorzy:
Mączyńska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2054831.pdf
Data publikacji:
2022
Wydawca:
Mazowieckie Biuro Planowania Regionalnego w Warszawie
Tematy:
social market economy
neoliberalism
ordoliberalism
Doughnut economics
COVID-19 pandemic
ordo
JEL classification codes: A14
E02
E65
O43
P20
społeczna gospodarka rynkowa
neoliberalizm
ordoliberalizm
ekonomia obwarzanka
pandemia COVID-19
Kody klasyfikacji JEL: A14
Opis:
The analyses presented in this essay are aimed at identifying potential directions of rationalization of socio-economic systems, designed not only for counteracting crisis destructions, but most of all the current global crisisogenicity. The need to search for rationalising solutions is not only demonstrated by the crisis that is encompassing the world in connection with the COVID-19 pandemic and which exposes the systemic dysfunctions of the global economy. This is also confirmed by the crisis multiplication characteristic of the modern world and already occurring before the pandemic, i.e. the overlapping of various crises, which creates a specific thickening crisis network. This intensifies discussions and questions concerning possible future directions of change in socio-economic systems. These questions are even more important because of the persisting neoliberal so-called zombi-ideas, i.e. ideas which, despite the fact that reality absolutely does not confirm their validity, are artificially and in the interest of narrow social groups kept alive and constitute a barrier to restoring order in the local and global dimension. In this context, this essay analyzes concepts that differ from the neoliberal ones, including the concept of Doughnut economics by British economist Kate Raworth. This economist demonstrates that the more economic growth is not in harmony with social and ecological progress, the larger the hole inside the doughnut is. The centre hole of the model is a metaphor for social destruction and neglect. However, the field of the doughnut itself is a metaphor for a safe and just socio-economic model, eliminating poverty on the one hand and planet-destroying consumerist excess on the other. The inner bottom edge of the doughnut illustrates the goals of social justice and welfare, which should be expanded reducing aforesaid hole. The outer edge determines the impassable limits of the burdens on the natural environment. The relationship between this concept and the ordoliberal model of the social market economy is analyzed. By definition, it is a model of political system focused on socio-economic order, a model with a treaty and constitutional status in the European Union countries. Ordo means order. However, the formal enshrinement of this model does not fully translate into socio-economic reality. Therefore, this model needs to be strengthened and adapted to the requirements of the fourth industrial revolution encompassing the world nowadays. The analyses presented in this essay indicate that this reinforcement could be achieved through combining the intellectual potential of the SOME model and the Doughnut economic model. Both of these concepts have in common their pro-social orientation, harmonizing economic, social and environmental objectives, balancing the socio-economic system, which prevents the occurrence of asymmetries that are harmful to socio-economic development.
Przedstawione w tym eseju analizy ukierunkowane są na identyfikowanie potencjalnych, kierunków racjonalizacji systemów społeczno-gospodarczych, służących nie tylko przeciwdziałaniu kryzysowym destrukcjom, lecz przede wszystkim charakterystycznej obecnie globalnej kryzysogenności. O konieczności poszukiwań racjonalizujących rozwiązań przekonuje nie tylko kryzys, jaki ogarnia świat w związku z pandemią COVID-19 i który obnaża systemowe dysfunkcje gospodarki globalnej. Przekonuje o tym także charakterystyczna dla współczesnego świata i występująca już przed pandemią, multiplikacja kryzysowa, czyli nakładanie się na siebie różnych kryzysów, co tworzy specyficzną, zagęszczającą się kryzysową sieć. Intensyfikują się w związku z tym dyskusje i pytania, dotyczące możliwych przyszłych kierunków zmian w systemach społeczno-gospodarczych. Pytania te są tym bardziej istotne, że wciąż utrzymują się neoliberalne tzw. zombi-idee, czyli idee, które, mimo że rzeczywistość absolutnie nie potwierdza ich zasadności, sztucznie i w interesie wąskich grup społecznych podtrzymywane są przy życiu, stanowiąc barierę przywracanie ładu w wymiarze lokalnym i globalnym. W tym kontekście w niniejszym eseju analizowane są odmienne od neoliberalnych koncepcje, w tym koncepcja ekonomii obwarzanka autorstwa brytyjskiej ekonomistki Kate Rawarth. Ekonomistka ta wykazuje, że im bardziej wzrost gospodarczy nie jest zharmonizowany z postępem społecznym i ekologicznym, tym większa dziura w rzeczonym obwarzanku. Dziura ta zaś jest metaforą destrukcji i zaniedbań społecznych. Natomiast pole samego obwarzanka stanowi metaforę bezpiecznego i sprawiedliwego modelu społeczno-gospodarczego, eliminującego ubóstwo z jednej strony oraz niszczącą naszą planetę, konsumpcjonistyczną przesadę i nadmiar, z drugiej. Wewnętrzna, dolna krawędź obwarzanka obrazuje cele sprawiedliwości społecznej i dobrobytu, które powinny być rozszerzane, zmniejszając rzeczoną dziurę. Zewnętrzna zaś krawędź wyznacza nieprzekraczalne granice obciążeń środowiska naturalnego. Analizowane są związki tej koncepcji z ordoliberalnym modelem społecznej gospodarki rynkowej. To model ustroju z definicji ukierunkowany na ład społeczno-gospodarczy, model mający w krajach Unii Europejskiej traktatowo-konstytucyjną rangę. Ordo bowiem znaczy ład. Jednak formalne umocowanie tego modelu nie przekłada się w pełni na społeczno-gospodarczą rzeczywistość. Dlatego też model ten wymaga wzmocnienia i dostosowania do wymogów czwartej rewolucji przemysłowej, ogarniającej obecnie świat. Przedstawione w tym eseju analizy wskazują, że wzmocnieniu temu mogłoby służyć synergicznie połączenie intelektualnego potencjału modelu SGR i ekonomii obwarzanka. Obydwie te koncepcje łączy bowiem ich prospołeczne ukierunkowanie, harmonizujące cele gospodarcze, społeczne i ekologiczne, bilansujące system społeczno-gospodarczy, co przeciwdziała występowaniu asymetrii szkodliwych dla społeczno-gospodarczego rozwoju.
Źródło:
MAZOWSZE Studia Regionalne; 2022, Special Edition 2022; 9-30
1689-4774
Pojawia się w:
MAZOWSZE Studia Regionalne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Polynomial Spline Method for a Time-Dependent Heat-Like Lane- Emden Equation
Autorzy:
Caglar, S.
Ucar, M.
Powiązania:
https://bibliotekanauki.pl/articles/1491458.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Jr
02.60.Lj
02.70.Bf
02.70.Jn
44.05.+e
Opis:
In this study, a time-dependent heat-like Lane-Emden equation is solved by using a non-polynomial spline method. An example is solved to assess the accuracy of the method. The numerical results are obtained for different values (n) of equation. The results indicate that non-polynomial spline method is effectively implemented. It is seen that results are compatible with exact solutions and consistent with other existing numerical methods.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 262-264
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of Some Robust Estimators for the Weibull Distribution
Autorzy:
Gündüz, N.
Başar, E.
Aydin, C.
Powiązania:
https://bibliotekanauki.pl/articles/1401976.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Rr
02.50.-r
Opis:
In this study, we consider some of univariate quantile-based robust estimators. We focus on the estimators such as median, interquartile range, quartile and octile skewness for the Weibull distribution which is one of the most widely applied probability function because of its versatility and relative simplicity. It is important to use robust estimators as a measure of distribution properties for analyzing data in the case of contamination with outliers. For small data sets, it is reported that by introducing kernel estimation for smoothing empirical distribution function, a reduction in mean square error of estimator is achieved by Fernholz (1997) and Hubert et al. (2013). In kernel estimation, it is well known that bandwidth selection is more important than selection of kernel density since bandwidth controls the smoothness of the estimated distribution function. Using simulation studies, we examine some quantile-based estimators for the Weibull distribution with various sample size. The performance of estimators is measured by mean squared error under Different outlier contaminated data. We applied this idea in the case of real data.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-203-B-207
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tolerance Analysis with Multiple Surrogate Models
Autorzy:
Bayram, U.
Acar, E.
Powiązania:
https://bibliotekanauki.pl/articles/1402505.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.-c
Opis:
Design and analysis of modern engineering systems are complicated, mostly relying on computational analyses codes and hence often computationally expensive. Meanwhile, improved computer-aided design and numerical simulation methods are used extensively in the design process. Even continuing growth of computing power and speed, computationally cheap and reliable models or simulation techniques are not available, at least as ready-to-use computer analysis codes. The necessity of tolerance analysis takes important place at the same time with improved CAD and computer based process planning, because of high quality production requirements, and reduces manufacturing costs. Simulation based design and optimization becomes the only option to meet the specifications, and improves the system reliability. In the last few decades, the use of surrogate models has achieved significant advantages, because they provide fast computation and design investigation as they replace computationally expensive to run computer analyses with cheap to run approximations. Surrogate models also simplify the integration of analyses codes to optimization and reliability assessment studies. In this paper, response surface and Kriging surrogate models are used within a Monte Carlo simulation framework for tolerance analysis. As an illustrative example problem, tolerance analyses of a clutch assembly with nonlinear objection function are used. The effects of the surrogate model parameters (e.g., the use of different regression polynomials) and the number of training points on tolerance analysis are explored.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-447-B-449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of 2D Hybrid Cellular Automata with Periodic Boundary
Autorzy:
Acar, E.
Uguz, S.
Akin, H.
Powiązania:
https://bibliotekanauki.pl/articles/1033502.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.10.Yn
02.10.Ox
07.05.Kf
Opis:
We investigate main theoretical aspects of two-dimensional linear-hybrid cellular automata with periodic boundary condition over the Galois field GF(2). We focus on the characterization of two-dimensional hybrid linear cellular automata by way of a special algorithm. Here we set up a relation between reversibility of cellular automata and characterization of two-dimensional hybrid linear cellular automata with a special boundary conditions, i.e. periodic case. The determination of the characterization problem of special type of cellular automaton is studied by means of the matrix algebra theory. It is believed that this type of cellular automata could find many different applications in special case situations, e.g. image processing area, textile design, video processing, DNA research, etc., in the near future.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 432-436
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of tanh method to complex coupled nonlinear evolution equations
Autorzy:
Abdelkawy, M.
Bhrawy, A.
Zerrad, E.
Biswas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1070617.pdf
Data publikacji:
2016-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Ik
02.30.Jr
05.45.Yv
Opis:
This paper studies the application of tanh method to address a few coupled nonlinear evolution equations that are in complex domain. There are soliton solutions as well as triangular solutions that are revealed with this integration scheme. The equations studied in this paper are applicable to various branches of applied and theoretical physics.
Źródło:
Acta Physica Polonica A; 2016, 129, 3; 278-283
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Granger Causality and Transfer Entropy for Financial Returns
Autorzy:
Syczewska, E.
Struzik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1388215.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.20.-a
89.70.Cf
02.50.-r
05.45.Tp
02.70.Rr
Opis:
Granger causality in its linear form has been shown by Barnett, Barrett and Seth [Phys. Rev. Lett. 103, 238701 (2009)] to be equivalent to transfer entropy in case of Gaussian distribution. Generalizations by Hlaváčková-Schindler [Appl. Math. Sci. 5, 3637 (2011)] are applied to distributions typical for biomedical applications. The financial returns, which are of great importance in financial econometrics, typically do not have Gaussian distribution. Generalizations leading to the concept of nonlinear Granger causality (e.g. causality in variance, causality in risk), known and applied in econometric literature, seem to be less known outside this field. In the paper an overview of some of the definitions and applications is given. In particular, we indicate some recent econometric results concerning application of the tests in linear multivariate framework. We emphasize importance of other variants of Granger causality, and need of development of methods reflecting features of financial variables.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-129-A-135
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A bias reducing approach for some robust estimators by predicting roughness in case of kernel estimation
Autorzy:
Gündüz, N.
Aydın, C.
Başar, E.
Powiązania:
https://bibliotekanauki.pl/articles/1070350.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Rr
02.50.-r
Opis:
In the density estimation it is known that estimators are heavily biased. We applied a bias reducing approach to improve some quantile estimators for Weibull distribution having different parameter values and contamination level. In this study, we estimate the bias for any quantile value and obtained biased reduced smoothed distribution function by simulation study for random samples of size 40. Then, the mean square error of some robust quantile estimators and variances are obtained from biased reduced smoothed distribution function. Furthermore, we obtained sampling distribution of roughness and sampling distribution of estimated bias related some quantile estimators.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 422-427
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Modeling of Heat Effect on Cable Insulation
Autorzy:
Eroglu, E.
Guney, I.
Gunes, I.
Sener, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031951.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.90.+p
88.20.td
Opis:
In the electric power industry, the cost of energy, its longevity and safety of transferring are important problems. Security problems, environmental effects, discharging occurrences and the endurance of the transporters are the problems that exist as a consequence of the high voltage necessity for the transmission of big amounts of energy and which need to be solved. ADSS (all dielectric self-supporting) cables are generally installed on high voltage transmission lines. They are mostly used in such situations, as high temperature, strong winds and direct sunshine and, as the effect, the UV radiation, etc. The solid materials are in use more frequently than gas or liquid ones. Decent dielectric materials need to be sturdy to puncturing and highly invulnerable for mechanical issues. Moreover, they have to perform and resist well the chemical reactions and high temperature, so that they would not be easily effected by the environmental factors. In this study, the mathematical modeling of heat effects on ADSS cables is investigated by using dry band arcing (IEEE 1222 Electrical surface degradation) test method. A heat source is introduced into the test setup, to evaluate the performance of poly-ethylene cable jackets on ADSS cables at different temperatures. Test results indicate that the endurance of the ADSS cables decreases with the increasing temperature.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 539-541
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lie Symmetry Reductions, Exact Solutions and Conservation Laws of the Third Order Variant Boussinesq System
Autorzy:
Yaşar, E.
Giresunlu, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1401513.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Ik
02.30.Jr
47.35.Fg
Opis:
The Lie group method is applied to the third order variant Boussinesq system, which arises in the modelling of the water waves. The symmetry reductions and invariant solutions are obtained with respect to Lie point symmetry generators of the underlying system. In addition, we derive conservation laws of the variant Boussinesq system.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 252-255
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Finite-Element Flash Method for Measuring Thermal Conductivity of Liquid
Autorzy:
Mamczur, J.
Wasilewski, A.
Więcek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1402572.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
44.05.+e
44.10.+i
07.05.Tp
02.70.Dh
02.60.Ed
Opis:
A laser beam is used to heat a portion of liquid closed in a vessel from the top of it to avoid convection. The temperature is measured at the bottom of the vessel by a laser waveguide sensor. The heating and measuring methods allow using a small amount of liquid of the order of a milliliter fraction. The heat flow through the liquid as well as the surrounding vessel and space is modeled by the finite-element method to calculate the temperature at the bottom vs. time. Thus obtained dependence is used then as a fitting function to get the liquid thermal conductivity among some other fitting parameters.
Źródło:
Acta Physica Polonica A; 2015, 128, 2; 193-195
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Braids for Pretzel Knots
Autorzy:
Suffczyński, M.
Powiązania:
https://bibliotekanauki.pl/articles/2014522.pdf
Data publikacji:
2000-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.10.+e
36.20.-r
87.15.-v
02.40.-k
Opis:
The words of braid closures for the pretzel knots, in particular the twist knots relevant to molecular supercoils in biochemistry, are recorded in a standardized form, which enables one to see the regular pattern of the words, and thus to write the braid words representing pretzel knots for general values of the crossing number.
Źródło:
Acta Physica Polonica A; 2000, 98, 6; 663-671
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Path Planning for Multiple Mobile Robots Using A* Algorithm
Autorzy:
Hüseyin Filiz, İ.
Olguner, S.
Evyapan, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031600.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.Pn
Opis:
This study presents optimization of planetary gear train in a specific configuration. General characteristics of planetary gear trains are discussed briefly. A compound configuration for planetary gear train is selected and an optimization study is performed for this configuration. For the given input power, motor speed and overall gear ratio, modules, facewidths, teeth numbers of gears are found, satisfying the condition of minimum kinetic energy of the gear trains. In optimization, the objective is set to minimization of kinetic energy. Allowable bending stress and allowable contact stress are considered as design constraints. Minimum teeth number for a given pressure angle, center distance, recommendation on the facewidth, limitations on teeth ratios are considered as geometrical and kinematical constraints. The Matlab® Optimtool optimization toolbox is used. Results for certain operating conditions are obtained and tabulated.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 728-733
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of a Generalized Extended (G/G) -Expansion Method to Find Exact Solutions of Two Nonlinear Schrödinger Equations with Variable Coefficients
Autorzy:
Zayed, E.
Abdelaziz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1489815.pdf
Data publikacji:
2012-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Jr
05.45.Yv
02.30.Ik
Opis:
In the present paper, we construct the travelling wave solutions of two nonlinear Schrödinger equations with variable coefficients by using a generalized extended (G'/G) -expansion method, where G = G(ξ) satisfies a second order linear ordinary differential equation. By using this method, new exact solutions involving parameters, expressed by hyperbolic and trigonometric function solutions are obtained. When the parameters are taken as special values, some solitary wave solutions are derived from the hyperbolic function solutions.
Źródło:
Acta Physica Polonica A; 2012, 121, 3; 573-580
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Processes Taking Place during Powder Coating Treatment by an Electron Beam or a Plasma Jet
Autorzy:
Alontseva, D.
Krasavin, A.
Kolesnikova, T.
Russakova, A.
Powiązania:
https://bibliotekanauki.pl/articles/1365754.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.Cb
02.30.Nw
44.05.+e
Opis:
This paper considers the problem of finding the temperature field in two-layer metallic materials heated by a moving source of radiation. It describes developed by the authors numerical method for solving the problem of heating a two-layer plate by a moving axially symmetric surface heat source with regard to the function of distribution of the power density of the beam for which the program of computation in $C^{++}$ was implemented. The calculation results were used for selecting the optimal parameters (speed and power density of the source) of modifying radiation of protective powder coatings on steel substrates.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1275-1279
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Colorings to Weavings
Autorzy:
Miro, E.
Garciano, A.
Zambrano, A.
Powiązania:
https://bibliotekanauki.pl/articles/1203364.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.20.-a
61.50.Ah
89.75.Kd
Opis:
We present a methodology for constructing weavings from 2-colorings of the plane. In particular, we consider tilings T of the plane by triangles and their corresponding triangle groups G. We derive 2-colorings of T using the index 2 subgroups of G.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 560-563
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology of the Random Fibonacci Tiling Space
Autorzy:
Gähler, F.
Miro, E.
Powiązania:
https://bibliotekanauki.pl/articles/1373463.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.40.Re
45.30.+s
61.44.Br
Opis:
We look at the topology of the tiling space of locally random Fibonacci substitution, which is defined as a ↦ ba with probability p, a ↦ ab with probability 1-p and b ↦ a for 0
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 564-567
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Electron-Positron Correlations by Monte Carlo Simulation
Autorzy:
Boroński, E.
Powiązania:
https://bibliotekanauki.pl/articles/2042170.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Bj
02.70.Ss
Opis:
Earlier theoretical studies, as well as recent calculations of positron annihilation rates in metals, show that some basic problems concerning electron-positron (e-p) interaction have not been solved satisfactorily, even for homogeneous media (the electron gas). In turn, the "computer experiments" e.g. quantum Monte Carlo simulations applied to these problems by several authors yielded only fragmentary, inaccurate and even incorrect results for smaller electron densities. It is shown in the present paper that the quantum Monte Carlo method may be useful in investigations of positron interactions with electrons. Reasonable annihilation rates have been obtained owing to appropriate construction of the trial function and taking into account the 3-particle correlations (i.e. dependence of the electron-electron (e-e) interaction on the distance from the positron). Moreover, the method of "exact determination" (without any fitting) of positron annihilation rates on the basis of the variational trial function was proposed. One also found the way of calculating the momentum dependent enhancement factors, the quantities not achievable within the Monte Carlo method until now.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 576-585
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quotient Cohomology of Certain 1- and 2-Dimensional Substitution Tiling Spaces
Autorzy:
Bugarin, E.
Gähler, F.
Powiązania:
https://bibliotekanauki.pl/articles/1202905.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.40.Re
45.30.+s
Opis:
The quotient cohomology of tiling spaces is a topological invariant that relates a tiling space to one of its factors, viewed as topological dynamical systems. In particular, it is a relative version of the tiling cohomology that distinguishes factors of tiling spaces. In this work, the quotient cohomologies within certain families of substitution tiling spaces in 1 and 2 dimensions are determined. Specifically, the quotient cohomologies for the family of the generalised Thue-Morse sequences and generalised chair tilings are presented.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 438-441
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exact Travelling Wave Solutions to the (3+1)-Dimensional Kadomtsev-Petviashvili Equation
Autorzy:
Peng, Y.-Z.
Krishnan, E. V.
Powiązania:
https://bibliotekanauki.pl/articles/2043655.pdf
Data publikacji:
2005-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Jr
Opis:
Exact travelling wave solutions in terms of the Jacobi elliptic functions are obtained to the (3+1)-dimensional Kadomtsev-Petviashvili equation by means of the extended mapping method. Limit cases are studied, and new solitary wave solutions and trigonometric periodic wave solutions are got. The method is applicable to a large variety of nonlinear partial differential equations.
Źródło:
Acta Physica Polonica A; 2005, 108, 3; 421-428
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jak to z emisją CO2 faktycznie jest?
What are the CO2 emissions really about?
Autorzy:
Stasiuk, E.
Powiązania:
https://bibliotekanauki.pl/articles/109218.pdf
Data publikacji:
2012
Wydawca:
AXIS MEDIA
Tematy:
emisja C02
Opis:
Po dziesięciogodzinnej debacie Polska zawetowała w Brukseli wnioski z posiedzenia ministrów środowiska w sprawie tzw. kroków milowych na drodze do redukcji dwutlenku węgla w UE do 2050 roku. Początkowo popierali nas Czesi i Rumuni, ale w końcu „wymiękli”. Kilka innych krajów kibicowało nam po cichu, choć oficjalnie zaprezentowało poprawny politycznie i jedynie słuszny kierunek. Przewodzący obecnie UE Duńczycy, którzy od nas przejęli ster unijnej władzy, chcieliby do celu iść naprawdę dużymi krokami, choć liczebnie są raczej małym 5,5-milionowym narodem, który - dzięki Grenlandii – może szczycić się 12 – pod względem wielkości na świecie - powierzchnią. Według najnowszych, lansowanych usilnie założeń, w 2030 roku mielibyśmy wszyscy zredukować emisje o 40 proc., w 2040 r. - o 60 proc., a w 2050 r. – aż o 80 proc. w porównaniu z 1990 roku.
Following a ten-hour debate in Brussels, Poland vetoed proposals formulated at a meeting of environment ministers which set out milestones in the EU’s 2050 low carbon roadmap. Although initially the Czechs and Romanians were in favour of this stance, eventually both countries dropped the veto. Several other countries secretly cheered for Poland despite the fact that their official position conformed with the prevalent political views imposed by the majority. Having taken over the EU Presidency after Poland, the Danes dream big when it comes to reaching goals in spite of being a rather small nation of 5.5 million people in a country that—thanks to Greenland—boasts the twelfth biggest area in the world. According to the recent, vigorously promoted objectives, in 2030 Poland would be forced to reduce emissions by 40 per cent, in 2040 by 60 per cent, and in 2050 by as much as 80 percent relative to 1990.
Źródło:
Piece Przemysłowe & Kotły; 2012, 5-6; 8-11
2082-9833
Pojawia się w:
Piece Przemysłowe & Kotły
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solutions for conservative nonlinear oscillators using an approximate method based on Chebyshev series expansion of the restoring force
Autorzy:
Beléndez, A.
Hernández, A.
Beléndez, T.
Pascual, C.
Alvarez, M.
Arribas, E.
Powiązania:
https://bibliotekanauki.pl/articles/1075577.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Hq
02.30.Mv
05.45.-a
Opis:
Approximate solutions for small and large amplitude oscillations of conservative systems with odd nonlinearity are obtained using a "cubication" method. In this procedure, the Chebyshev polynomial expansion is used to replace the nonlinear function by a third-order polynomial equation. The original second-order differential equation, which governs the dynamics of the system, is replaced by the Duffing equation, whose exact frequency and solution are expressed in terms of the complete elliptic integral of the first kind and the Jacobi elliptic function cn, respectively. Then, the exact solution for the Duffing equation is the approximate solution for the original nonlinear differential equation. The coefficients for the linear and cubic terms of the approximate Duffing equation - obtained by "cubication" of the original second-order differential equation - depend on the initial oscillation amplitude. Six examples of different types of common conservative nonlinear oscillators are analysed to illustrate this scheme. The results obtained using the cubication method are compared with those obtained using other approximate methods such as the harmonic, linearized and rational balance methods as well as the homotopy perturbation method. Comparison of the approximate frequencies and solutions with the exact ones shows good agreement.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 667-678
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unstable Inverse Heat Transfer Problems in Microelectronics
Autorzy:
De Mey, G.
Bogusławski, B.
Kos, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400120.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Zz
44.05.+e
85.40.Qx
Opis:
Inverse heat transfer problems are very important for the thermal testability of integrated circuits. Temperature sensors integrated on the same chip measure in real time the power dissipation in one or more critical heat sources of the circuit in order to prevent overheating. It will be demonstrated that these kinds of problems can give rise to mathematical unstabilities or the ill conditioning of the inverse problem. This statement will be proved with the help of several particular cases.
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 637-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Second Order Algorithms for Function Approximation with Neural Networks
Autorzy:
Boutalbi, E.
Ait Gougam, L.
Mekideche-Chafa, F.
Powiązania:
https://bibliotekanauki.pl/articles/1402013.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Mv
07.05.Mh
Opis:
The Neural networks are massively parallel, distributed processing systems representing a new computational technology built on the analogy to the human information processing system. They are usually considered as naturally parallel computing models. The combination of wavelets with neural networks can hopefully remedy each other's weaknesses, resulting in wavelet based neural network capable of approximating any function with arbitrary precision. A wavelet based neural network is a nonlinear regression structure that represents nonlinear mappings as the superposition of dilated and translated versions of a function, which is found both in the space and frequency domains. The desired task is usually obtained by a learning procedure which consists in adjusting the "synaptic weights". For this purpose, many learning algorithms have been proposed to update these weights. The convergence for these learning algorithms is a crucial criterion for neural networks to be useful in different applications. In this paper, we use different training algorithms for feed forward wavelet networks used for function approximation. The training is based on the minimization of the least-square cost function. The minimization is performed by iterative first and second order gradient-based methods. We make use of the Levenberg-Marquardt algorithm to train the architecture of the chosen network and, then, the training procedure starts with a simple gradient method which is followed by a BFGS (Broyden, Fletcher, Glodfarb et Shanno) algorithm. The conjugate gradient method is then used. The performances of the different algorithms are then compared. It is found that the advantage of the last training algorithm, namely, conjugate gradient method, over many of the other optimization algorithms is its relative simplicity, efficiency and quick convergence.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-271-B-272
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sytuacja na krajowym rynku rzepaku - stan obecny i prognoza na sezon 2001/02
Autorzy:
Rosiak, E
Powiązania:
https://bibliotekanauki.pl/articles/833645.pdf
Data publikacji:
2001
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
prognozowanie
stan obecny
rynek rzepakowy
prognosis
present state
rapeseed oil
Źródło:
Rośliny Oleiste - Oilseed Crops; 2001, 22, 2; 527-537
1233-8273
Pojawia się w:
Rośliny Oleiste - Oilseed Crops
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiaton Effects on TAC-PF Electromagnetic Calorimeter
Autorzy:
Pilicer, E.
Kocak, F.
Kilic, A.
Pilicer, F.
Tapan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1032530.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.88.+h
07.20.Fw
02.70.Uu
Opis:
The proposed particle factory detector for Turkish Accelerator Center (TAC-PF) being a regional facility in Turkey will operate at the center of mass energy about 3.77 GeV with designed luminosity of the order of 10³⁴ cm¯² s¯¹. The electromagnetic calorimeter part of the detector is considered to have PbWO₄ and CsI(Tl) crystals coupled with photodiodes. In this study, the exposed dose rate to electromagnetic calorimeter during PF detector operation was estimated by FLUKA Monte Carlo tool. The irradiation effects such as the change of light yield and light transmission of these crystals were investigated to evaluate TAC-PF electromagnetic calorimeter energy resolution.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 190-192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micromechanical Investigation of Elastic Properties for Polypropylene Fiber-Matrix Composite
Autorzy:
Günay, E.
Powiązania:
https://bibliotekanauki.pl/articles/1033377.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.23.Pq
81.05.Qk
62.20.de
62.20.dj
02.70.Dh
Opis:
In this study, the mechanical properties of unidirectional fiber composites were determined by using the representative volume element method. The aim of this study was to determine the equivalent elastic constants for the "fiber composite polymer (PPE/PP) thermoplastic material" used in a wide variety of engineering applications. At the first step, the micromechanical model was applied to the polypropylene (PP) fiber-matrix composite, and then the microstructure form of the material was analyzed by finite element method considering "rule of mixture". The symmetry boundary conditions have been applied by using the representative volume elements in 3D finite element models. The SOLID187 mesh element of ANSYS was used for the presentation of the microstructure form of the fiber-matrix composite. The elastic constants obtained in this study were respectively as follows: the longitudinal elastic modulus and the Poisson ratio E₁, ν₁₂, the transverse elastic modulus and the Poisson ratio E₂, ν₂₃. For verification, the numerical results were also compared with the literature.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 143-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of Langmuir-Blodgett Film Surface Stm Images
Autorzy:
Agabekov, V. E.
Zhavnerko, G. K.
Bar, G.
Cantow, H.-J.
Powiązania:
https://bibliotekanauki.pl/articles/1968763.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
71.20.Rv
02.60.Cb
Opis:
The simulation of the STM image of a hydrocarbon tail of a fatty acid was carried out and compared to the experimental results. The simulation procedure includes calculations of the distribution of an isolated molecule electronic density by the extended Huckel-Hoffmann method. An agreement between the calculated and experimental STM images of closely packed Langmuir-Blodgett film of cobalt behenate on the graphite surface was observed. The weak interactions between the graphite surface and the adsorbed molecules constituting bi- and multilayer Langmuir-Blodgett films can be neglected in simulations of STM images.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 383-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can Social Capital Be the New Dynamics of Economic Development?
Autorzy:
Eroğlu, İlhan
Kangal, Nalan
Powiązania:
https://bibliotekanauki.pl/articles/652629.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
social capital
humanitarian capital
economic development
E22
G02
O11
O18
Opis:
Besides other capital types, social capital is such a kind of capital, which is revealed by the confidence level of the society and certain financial facts. This study questions whether the social capital could be new dynamics for the developments of the countries along with other types of capitals (real capital and human capital). According to the recent research it has been concluded that the social capital has some positive effects to decrease the asymmetric information; to gain trust, information sharing and competitive power; to increase the participation in political life and social organizations; to fix the distribution of income; and to accelerate the economic growth. As a result, considering the fact that the countries with high confidence level have high humanitarian growth and high income per capita, it has been concluded that social capital may create new dynamics of economic development.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2016, 19, 4
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mesomorphic Properties and Computer Simulation of Guanazole Derivatives and Their Mixtures
Autorzy:
Moskvin, D.
Sotsky, V.
Danilova, E.
Kudayarova, T.
Smirnova, A.
Usol'tseva, N.
Powiązania:
https://bibliotekanauki.pl/articles/1192351.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Ns
65.90.+i
Opis:
An investigation of the mesomorphic properties of 3,5-diamino-1-dodecyl-1,2,4-triazole and 3-amino-1,5-dodecyl-1,2,4-triazole binary mixture in the ratio of 1:0.75 (four molecules of the first compound and three of the second) was performed. By means of polarizing optical microscopy, it was discovered that the experimentally obtained binary mixture possesses enantiotropic mesomorphic properties (SmA phase). With the help of the molecular dynamics simulation of both individual triazole derivatives and their binary mixture, it was shown that the SmA-mesophase is caused by the presence of the di-dodecyl substituted triazole derivative.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 950-952
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Crash Boxes Light Weighting with Syntactic Foams by the Finite Element Analysis
Autorzy:
Özer, H.
Can, Y.
Yazıcı, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031574.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Dh
62.20.-x
61.41.+e
Opis:
Light-weighting is a new scope in the automotive industry to accommodate new emission regulations. The parts produced with conventional metallic materials are replaced with parts produced by using light weight or high strength materials, to obtain light weighted equivalents of the same strength. Foam core sandwich structures, high strength steels, composite materials are the most used alternative materials. Syntactic foams that show outstanding performance in case of high-speed collisions have an excellent utility as energy absorbers in vehicle crash boxes. Syntactic foams are modeled in crash boxes at various filling rates and filling patterns in the context of this study. As results of the FEM analyses, it is observed that syntactic foams have excellent crash performance, as well as weight-reducing effect in vehicle crash boxes.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 734-737
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Results on Gain-Loss Asymmetry for Stock Markets Time Series
Autorzy:
Grudziecki, M.
Gnatowska, E.
Karpio, K.
Orłowski, A.
Załuska-Kotur, M.
Powiązania:
https://bibliotekanauki.pl/articles/1812227.pdf
Data publikacji:
2008-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
02.50.r
89.90.+n
Opis:
A method called investment horizon approach was successfully used to analyze stock markets of many different countries. Here we apply a version of this method to study characteristics of the Polish Pioneer mutual funds. We decided to analyze Pioneer because of its longest involvement in investing on the Polish market. Moreover, it apparently manages the biggest amount of money among all similar institutions in Poland. We compare various types of Pioneer mutual funds, characterized by different financial instruments they invest in. Previously, investment horizon approach produced different characteristics of emerging markets as opposed to mature ones, providing a possible way to quantify stock market maturity. Here we generalize the above mentioned results for mutual funds of various types.
Źródło:
Acta Physica Polonica A; 2008, 114, 3; 569-574
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Micromechanics Investigation of Wood Cell Walls under Compression Loading
Autorzy:
Günay, E.
Golmohammadi, H.
Powiązania:
https://bibliotekanauki.pl/articles/1398697.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.gp
87.17.Rt
83.80.Lz
68.37.Ps
02.70.Dh
87.16.Gj
Opis:
The aim of this study was to detect the determinations of the 3D cell deformations of pine wood (Pinus sylvestris L.) in micro-scale(µm) under mechanical compression loading. The 20× 20× 50 mm³ sized wood specimens were tested under compressive pressure load through 35-40 MPa parallel to the grain orientations. The pressure applied samples were divided into three parts, then processed to form smaller cubic pieces and this pieces stained with gold liquid in order to get scanning electron microscopy images (12× 12× 12 mm^3 parts). The deformed cells were photographed in 3D-plane with magnification of (100×), (1500×) and in the range of 3.0-5.0 kV light voltage under the scanning electron microscope. Unloaded and loaded pine wood specimens were visualized and photographed to observe and examine the contraction or expansion of the cell walls comparatively. Based on the experimentally obtained microstructural permanent deformations of the cell structures, a numerical model had been proposed to explain the complex behaviour of cell structures under compression loading. Using the finite element method and ANSYS code, the permanent deformation ratios of three different pinewood cell models were simulated for 35-40 MPa loading to explain the overall stiffness and strength of the pinewood cells. In this way, by considering the results obtained from scanning electron microscopy measurements and related finite element analysis solutions, permanent deformation of honeycomb type pinewood cells was examined in detail.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 459-463
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conformation-Dependent Photophysics of Bifunctional Hydrogen Bond Donor/Acceptor Molecules
Autorzy:
Kijak, M.
Petkova, I.
Toczek, M.
Wiosna-Sałyga, G.
Zielińska, A.
Herbich, J.
Thummel, R.
Waluk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1814016.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.15.-e
02.70.-c
Opis:
A series of heteroazaaromatic molecules possessing both a hydrogen bond donor and acceptor groups linked by a single bond was studied using electronic absorption and fluorescence techniques, combined with quantum-chemical calculations. Fluorescence lifetimes and quantum yields strongly depend on the solvent. Double exponential decays are observed in alcohols. This was interpreted in terms of alcohol-induced syn-anti rotamerization in the ground electronic state. The driving force for the conformational change is provided by two factors: (a) solvent polarity increase; (b) the formation of two separate hydrogen bonds in the anti species. In the syn structure, formation of cyclic hydrogen bonds leads to rapid depopulation of the lowest excited singlet state via two competing mechanisms: proton transfer and enhanced internal conversion. The experimental results are rationalized by calculations which include specific and nonspecific solvent effects.
Źródło:
Acta Physica Polonica A; 2007, 112, S; S-105-S-120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Mathematics of Human Contact: Developing a Model for Social Interaction in School Children
Autorzy:
Ashton, S.
Scalas, E.
Georgiou, N.
Kiss, I.
Powiązania:
https://bibliotekanauki.pl/articles/1029552.pdf
Data publikacji:
2018-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Uu
87.10.Mn
87.10.Rt
87.23.Ge
Opis:
In this paper, we provide a statistical analysis of high-resolution contact pattern data within primary and secondary schools as collected by the SocioPatterns collaboration. Students are graphically represented as nodes in a temporally evolving network, in which links represent proximity or interaction between students. This article focuses on link- and node-level statistics, such as the on- and off-durations of links as well as the activity potential of nodes and links. Parametric models are fitted to the on- and off-durations of links, inter-event times and node activity potentials and, based on these, we propose a number of theoretical models that are able to reproduce the collected data within varying levels of accuracy. By doing so, we aim to identify the minimal network-level properties that are needed to closely match the real-world data, with the aim of combining this contact pattern model with epidemic models in future work.
Źródło:
Acta Physica Polonica A; 2018, 133, 6; 1421-1432
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polar Phonons in Relaxor Ferroelectric 0.2PSN-0.4PMN-0.4PZN
Autorzy:
Macutkevič, J.
Kamba, S.
Pashkin, A.
Banys, J.
Bormanis, K.
Sternberg, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813209.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.-j
63.20.-e
71.55.Jv
Opis:
Relaxor ferroelectrics $0.2PbSc_{1//2}Nb_{1//2}O_3-0.4PbMg_{1//3}Nb_{2//3}O_3-0.4PbZn_{1//3}Nb_{2//3}O_3$ ceramics were studied by means of the Fourier transform infrared reflection and THz transmission spectroscopy in the temperature range of 20-500 K. On heating from low temperatures, the $A_1$ component of the strongly split $TO_1$ mode softens towards the Burns temperature, but the softening ceases near 400 K, which could be a signature of polar cluster percolation temperature.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 879-882
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role and position of iron in 0.8CaZrO3-0.2CaFe2O4
Autorzy:
Szczerba, J.
Śnieżek, E.
Stoch, P.
Prorok, R.
Jastrzębska, I.
Powiązania:
https://bibliotekanauki.pl/articles/146129.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
calcium ferrite
calcium zirconate
Mössbauer spectroscopy
perovskite
spinel
Opis:
The aim of the study was to characterize the 0.8CaZrO3-0.2CaFe2O4 composite structure with particular emphasis on the role and position of iron in the function of sintering temperature. The paper presents the results of 57Fe Mössbauer effect at room temperature. It was found that the increase of sintering temperature causes an increase in the amount of incorporated iron ions in the CaZrO3-crystal structure. Based on Mössbauer spectroscopy analysis, it was found that three different environments of Fe3+ ions were observed in the obtained materials. Two of them corresponded to CaFe2O4 phase and one was associated with the substitution of Zr4+ by Fe3+ in the CaZrO3 structure.
Źródło:
Nukleonika; 2015, 60, 1; 147-150
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In Quest of Optimal Algorithms for Molecular Dynamics Simulation of Surface Phenomena
Autorzy:
Mościński, J.
Alda, W.
Bargiel, M.
Bubak, M.
Dzwinel, W.
Kitowski, J.
Mościńska, E.
Skotniczny, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1891747.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.+d
64.70.Fx
68.10.La
Opis:
In this paper we present short-range molecular dynamics algorithms and programs elaborated for sequential and vector computer architectures. They are suitable for investigations of surface and subsurface layer properties which require of about 10$\text{}^{5}$ molecules in a computational box.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 649-652
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Magneto-Mechanical Analysis of Destructive Coils with Reinforcement Cylinders of Various Thicknesses
Autorzy:
Kačianauskas, R.
Kačeniauskas, A.
Stupak, E.
Balevičius, S.
Žurauskienė, N.
Novickij, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807956.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Dh
73.50.Fq
75.40.Mg
75.47.Gk
Opis:
The destructive laboratory device, generating half-period sinus-shaped magnetic field pulses of 0.15-2 ms duration is investigated numerically. The coil was placed into a steel reinforcement cylinder to resist magnetic forces, while influence of thickness of the reinforcement cylinder is considered in detail. The time-dependent non-linear magneto-mechanical model and the finite element software ANSYS are employed. On the basis of the mechanical analysis, reasonable explanation of the destruction nature is provided. The numerically obtained operation threshold value was in good agreement with experimental measurements.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1144-1145
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ composite cathode for solid oxide fuel cell
Autorzy:
Mosiałek, M.
Kędra, A.
Krzan, M.
Bielańska, E.
Tatko, M.
Powiązania:
https://bibliotekanauki.pl/articles/355878.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
barium strontium cobalt ferrite
lanthanum strontium cobalt ferrite
solid oxide fuel cell
oxygen reduction reaction
electrochemical impedance spectroscopy
Opis:
Composite cathodes contain Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ were tested in different configuration for achieving cathode of area specific resistance lower than Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ cathodes. Electrodes were screen printed on samaria-doped ceria electrolyte half-discs and tested in the three electrode setup by the electrochemical impedance spectroscopy. Microstructure was observed by scanning electron microscopy. The lowest area specific resistance 0.46 and 2.77 Ω cm-2 at 700 °C and 600 °C respectively revealed composite cathode contain Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ in 1:1 weight ratio. The area specific resistance of this cathode is characterized by the lowest activation energy among tested cathodes.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1483-1488
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High Power Laser Beam on Physical Properties of Epitaxial Films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2)
Autorzy:
Kuźma, M.
Abeynayake, C.
Sheregii, E.
Virt, I.
Powiązania:
https://bibliotekanauki.pl/articles/1891472.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.60.Cs
81.40.Rs
Opis:
Models have been proposed explaining differences in electrophysical and photoelectrical properties of epitaxial films of Hg$\text{}_{1-x}$Cd$\text{}_{x}$Te (x≈0.2) before and after treating by single pulses of Nd:YAG laser. These models were obtained on the basis of the calculated distributions of temperature, temperature gradient and concentration of interstitial mercury during and after exposing to the laser pulse. These calculations were done using the net method.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 475-479
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Spin-Low Spin Transitions in $Cu_{0.2}Co_{0.76}Cr_{1.83}Se_4$ Semiconductor
Autorzy:
Maciążek, E.
Groń, T.
Pacyna, A.
Mydlarz, T.
Krok-Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1489908.pdf
Data publikacji:
2012-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Wx
75.50.Dd
75.50.Ee
Opis:
Magnetization, ac and dc magnetic susceptibility measured in the zero-field-cooled mode were used to study the high spin-low spin transitions in polycrystalline $Cu_{0.2}Co_{0.76}Cr_{1.83}Se_4$ semiconductor. The real part component of fundamental susceptibility $χ_1^\prime$ (T) and its second $(χ_2)$ and third $(χ_3)$ harmonics revealed two spectacular peaks at 128 K and at 147 K, confirming the appearance of the spin-crossover phenomenon.
Źródło:
Acta Physica Polonica A; 2012, 121, 3; 687-689
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Behaviour of the Mean-Field Ferromagnet $Cu_{1.02}[Cr_{1.77}Ti_{0.24}]Se_4$
Autorzy:
Krok-Kowalski, J.
Władarz, G.
Rduch, P.
Malicka, E.
Groń, T.
Guzik, A.
Powiązania:
https://bibliotekanauki.pl/articles/1409626.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
75.50.Dd
64.60.Ht
Opis:
Magnetization, M, and susceptibility, χ, measurements showed both strong lowering of magnetic moment in comparison with $CuCr_2Se_4$ matrix and zero-field-cooling-field-cooling susceptibility splitting characteristic for the spin-glass behaviour. Isothermal magnetization curves, M(H), easy saturate and large values both of the Curie $T_{C}$=253 K and Curie-Weiss θ=283.5 K temperatures indicate the ferromagnetic order which coexists with the spin-glass state. The critical behaviour investigated around the paramagnetic-ferromagnetic phase transition revealed that the values of critical exponents are close to those predicted by the mean field model for long-range magnetic interactions.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1102-1104
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Investigations of $Ni_{0.2}Zn_{0.8}Fe_2O_4$ Ferrite Nanofiber Membranes by Needleless Electrospinning Method
Autorzy:
Streckova, M.
Mudra, E.
Sebek, M.
Sopcak, T.
Dusza, J.
Kovac, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398266.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.Cd
75.50.Gg
81.07.-b
75.47.Lx
Opis:
The preparation of $Ni_{0.2}Zn_{0.8}Fe_2O_4$ nanofiber membranes by simple and versatile needleless electrospinning technique is presented. The single phase of spinel ferrite membrane was obtained after conventional thermal treatment of polyvinyl alcohol (PVA)/metal nitrate precursors at 800°C for 4 h in air. The formation of single-phase fibers was characterized using differential scanning calorimetry accompanied with thermogravimetric analysis. The surface morphology, microstructure and crystal structure were investigated by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The magnetic properties of the fibrous samples measured in the temperature range from 2 to 300 K verify a soft magnetic behavior, which is quite typical for ferrimagnetic spinel-type ferrites.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 729-731
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photonic Liquid Crystal Fibers with Polymers
Autorzy:
Woliński, T.
Tefelska, M.
Mileńko, K.
Siarkowska, A.
Budaszewski, D.
Domański, A.
Ertman, S.
Orzechowski, K.
Rutkowska, K.
Sierakowski, M.
Nowinowski-Kruszelnicki, E.
Dąbrowski, R.
Mergo, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399416.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Df
42.81.Wg
02.60.Cb
42.70.Qs
Opis:
Photonic liquid crystal fibers with polymers constitute a new solution based on liquid crystals and microstructured polymer optical fibers opening up new areas in innovative sensing and photonic devices applications. Compared with their silica-based microstructured fibers, it is easier to fabricate exotic microstructured polymer optical fibers by extrusion or drilling at low temperature; their nonlinearity is potentially stronger, the range of available polymers that may be drawn is more diverse and the biocompatibility of polymers is often better. Liquid crystals due to their attractive properties i.e., the high birefringence, high electro-optic and thermo-optic effects are a very good candidate for microstructured polymer optical fiber infiltration to obtain tunable all-in-fiber innovative photonic devices. The paper will discuss basic properties and possible applications of the polymer photonic liquid crystal fibers that will arise from their high optical tunability with external and internal factors. Current research effort is directed towards two main solutions: photonic crystal fibers and microstructured polymer optical fiber-based structures, both infiltrated with liquid crystals of tailored optical properties.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 613-616
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Bulk Defects, Surface States, and Excitons on Yellow and Ultraviolet Photoluminescence in GaN
Autorzy:
Matys, M.
Miczek, M.
Adamowicz, B.
Żytkiewicz, Z.
Kamińska, E.
Piotrowska, A.
Hashizume, T.
Powiązania:
https://bibliotekanauki.pl/articles/1492736.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
71.35.-y
73.20.-r
71.55.-i
02.70.Dh
Opis:
The quantitative analysis of the influence of deep bulk levels, surface states and excitons on yellow, green and ultraviolet photoluminescence from n-type GaN was performed. The theoretical calculations of recombination rates in the bulk and at n-GaN surface versus UV-excitation intensity were done numerically using finite element method basing on drift-diffusion model assuming point deep levels, continuous energetic distribution of surface states, as well as excitons. The obtained results of the photoluminescence intensity were compared with experimental data (measured within the range from $10^{15}$ to $10^{19}$ photon $cm^{-2} s^{-1}$) for n-GaN samples with various surface passivating layers $(Al_2O_3, SiO_2)$.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-073-A-075
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a Skid Type Landing Gear of a Rotary Wing UAV by Experimental and Numerical Methods
Autorzy:
Yildirim, O.
Günay, E.
Anil, Ö.
Aygün, C.
Powiązania:
https://bibliotekanauki.pl/articles/1401314.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
45.20.da
45.50.Tn
02.70.Dh
04.80.Cc
06.30.-k
45.20.D
Opis:
The objective of this study was to analyze the results obtained from tests done by simulating the crash landing of a rotary wing unmanned air vehicle with a skid type landing gear. The experimental and computational methods were used in the simulation tests. In the first portion of the test; namely with the experimental method, the impact loads induced by the simulated crash landing and the stresses, strains, deformations generated by these loads, were recorded by drop test apparatus. In the second portion of the test with the computational method, free falling of the skid type landing gear was modeled and crash landing test was simulated numerically by using ANSYS code. Experimental methods were applied on four skid landing gear specimens with different shapes. Each of the test samples used in the following test was evolved because each sample was developed and redesigned based on the feedback results obtained from the former test.The first three test specimens were manufactured from 2024 T3, 7075 T6 and 6061 T6 aluminum alloys respectively and all of them were curved in Π-form with a solid cross section. The last and fourth specimen was also manufactured from 6061 T6 aluminum alloy and it was curved in a hollow semi-circle form (∩-form). It is concluded that the last and fourth developed specimen was the best in absorbing the impact energy and enduring the crash.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1170-1175
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Stresses and Forces on the Orthodontic System by Using Numerical Simulation of the Finite Elements Method
Autorzy:
Ferčec, J.
Glišić, B.
Šćepan, I.
Marković, E.
Stamenković, D.
Anžel, I.
Flašker, J.
Rudolf, R.
Powiązania:
https://bibliotekanauki.pl/articles/1418115.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.Dh
81.40.Jj
87.10.Kn
87.19.Rr
Opis:
This study was addressed to use knowledge about the orthodontic system with numerical simulation of the finite elements method. For the first time we simulated the stresses on the orthodontic system and, in this manner, calculated the orthodontic force on the tooth. A 3D orthodontic model or orthodontic system was designed resembling moderate crowding in the dental arch with all supporting structures. CATIA V5 computer software was used to set up a model for the orthodontic system and ABAQUS was used for simulation of the stresses on the orthodontic system. Our attention was focused on the stresses on the tooth lateral incisor and its periodontal ligament. The results of the numerical simulation showed complex stresses on the tooth lateral incisor and its periodontal ligament. In this paper there is presented a calculation of the orthodontic force acting on the tooth lateral incisor due to the orthodontic wire. This orthodontic force was calculated from the stresses on the bracket. The calculated orthodontic force was in the area which is considered as the optimal orthodontic force for movement of the tooth.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 659-665
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Milk production and ruminal parameters of dairy cows fed diets containing Lactobacillus sakei KTU05-6 and Pediococcus pentosaceus BaltBio02
Autorzy:
Lele, V.
Zelvyte, R.
Monkeviciene, I.
Kantautaite, J.
Stankevicius, R.
Ruzauskas, M.
Sederevicius, A.
Antanaitis, R.
Bartkiene, E.
Powiązania:
https://bibliotekanauki.pl/articles/2087548.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dairy cows
lactic acid bacteria
antimicrobial activities
rumen
milk
Źródło:
Polish Journal of Veterinary Sciences; 2019, 2; 327-335
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of Metal-Cylinder-Based Microwave Plasma Module
Autorzy:
Sobański, M.
Jasiński, M.
Mizeraczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1366115.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.80.hp
84.40.-x
52.35.Hr
84.40.Dc
02.70.Dh
88.30.E-
52.65.-y
52.50.Dg
11.55.-m
52.40.Fd
84.40.Az
Opis:
We present optimization of energy transfer in the waveguide-supplied metal-cylinder-based microwave plasma module with an inner cylindrical quartz tube. The construction of microwave plasma module is based on a WR 340 waveguide standard. Presented microwave plasma module operates at atmospheric pressure and frequency of 2.45 GHz. There is a reduced height section waveguide in microwave plasma module which provides local increase of the electric field in the plasma region. Microwave plasma module is terminated with a movable plunger which plays the role of the tuning element. Tuning characteristics of microwave plasma module are defined as the dependence of the $P_{R}$/$P_{I}$ on the position $l_{s}$ of the movable plunger, where $P_{R}$ and $P_{I}$ are the microwave power reflected and power incident, respectively. The powers $P_{R}$ and $P_{I}$ are measured in the input plane of microwave plasma module. The purpose of the presented optimization is to achieve $P_{R}$ lower than 5% of $P_{I}$ in widest range of position of movable plunger $l_{s}$. We used Comsol Multiphysics software to make numerical analysis which allows to optimize the parameters of microwave plasma module. Results of numerical analysis show that $P_{R}$/$P_{I}$ is lower than 0.05 in a wide range of movable plunger position $l_{s}$.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1309-1311
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composite Ag-La0.6Sr0.4Co0.8 Fe0.2O3-σ cathode material for solid oxide fuel cells, preparation and characteristic
Kompozytowy materiał katodowy Ag-La0.6Sr0.4Co0.8 Fe0.2O3-σ do stałotlenkowych ogniw paliwowych, otrzymywanie i charakterystyka
Autorzy:
Mosiałek, M.
Tatko, M.
Dudek, M.
Bielańska, E.
Mordarski, G.
Powiązania:
https://bibliotekanauki.pl/articles/354802.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
intermediate-temperature solid oxide fuel cells
Ag-LSCF composite cathode
silver interlayer
samaria doped ceria
stałotlenkowe ogniwo paliwowe
katody kompozytowe z metalicznego srebra
pasta srebrowa
tlenek ceru
Opis:
Composite cathodes Ag-La0.6 Sr0.4 Co0.2 Fe0.8O3-σ were obtained by two different procedures. In the first procedure porous La0.6 Sr0.4 Co0.2 Fe0.8O3-σ (LSCF) matrix was prepared by sintering the LSCF paste, the matrix was then saturated with AgNO3 solution and sintered again. Introduced silver crystalized in the form of 10 nm crystallites in the whole LSCF matrix. In the second procedure the paste of silver powder was deposited on the surface of electrolyte and dried. The layer of silver paste was then covered by a layer of the LSCF paste and sintered at 850°C. The following cells were tested: H2|Ni-Ce0.8Gd0.2O1.9|Ce0.8Sm0.2O1.9LSCF|O2, H2|Ni-Ce0.8Gd0.2 O1.9|Ce0.8 Sm0.2 O1.9 |LSCF-Ag|O2 and H2 |Ni-Ce0.8Gd0.2O1.9|Ce0.8Sm0.2O1.9|Ag|LSCF|O2. Introduction of silver interlayer between cathode and electrolyte increased output power by 18-28% whereas introduction of metallic silver into porous LSCF caused increase in power by 14-18%.
Kompozytowe katody Ag-La0.6 Sr0.4 Co0.2 Fe0.8O3-σ wykonano dwoma sposobami. W pierwszej metodzie otrzymano poro- watą matrycę La0.6 Sr0.4 Co0.2 Fe0.8O3-σ (LSCF) poprzez wyprażenie pasty LSCF, następnie nasączono ją roztworem AgNO3 i ponownie wyprażono. Wprowadzone srebro wykrystalizowało w postaci 10 nm krystalitów w matrycy LSCF. W drugiej metodzie na powierzchni elektrolitu położono pastę srebrną a po wysuszeniu pastę LSCF i wyprażono w 850°C. Testowano następujące ogniwa H2|Ni-Ce0.8Gdo.2O1.9|Ce0.8Sm0.2O1.9LSCF|O2, H2|Ni-Ce0.8Gd0.2 O1.9|Ce0.8 Sm0.2 O1.9 |LSCF-Ag|O2 and H2 |Ni-Ce0.8Gd0.2O1.9|Ce0.8Sm0.2O1.9|Ag|LSCF|O2. Wprowadzenie warstwy srebra pomiędzy katodę a elektrolit podniosło moc ogniwa o 18-28% podczas gdy wprowadzenie srebra do porowatego LSCF spowodowało wzrost mocy o 14-18%.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 4; 1341-1345
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of Toxicity and Biodegrability of Sulfonamides Solutions during Their Photocatalytic Degradation
Zmiany toksyczności i podatności na biodegradację roztworów zawierających sulfonamidy podczas ich degradacji metodą fotokatalityczną
Autorzy:
Baran, W.
Adamek, E.
Makowski, A.
Sochacka, J.
Sobczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/388706.pdf
Data publikacji:
2009
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
sulfonamidy
proces fotokatalityczny
TiO2
biodegradacja
toksyczność
Chlorella vulgaris
sulfonamides
photocatalytic process
Ti02
biodegradation
ecotoxicity
Opis:
The aim of this study was to estimate the applicability of the photocatalytic process to: (1) sulfa-drugs degradation in aqueous solutions, (2) a decrease in their toxicity and (3) an increase in the biodegradability. Photocatalytic process initiated by UV-A radiation was carried out in open reactors containing a catalyst (TiO2 suspension) and solutions of five sulfonamides. After a definite irradiation time the change of sulfa-drugs concentration in solutions was estimated using HPLC method. Moreover, changes of total organic carbon (TOC), chemical oxygen demand (COD), biochemical oxygen demand (BOD5) as well as changes of sulfonamides toxicity relative to Chlorella vulgaris were examined. The biodegradability investigated sulfonamides and their photocatalytic degradation products was determined based on BOD5/COD ratio. It was found that under experimental conditions all investigated sulfonamides underwent the photocatalytic degradation and the decrease in TOC and COD of sulfa-drugs solutions was observed. Simultaneously, products of this process were less toxic and more biodegradable than initial sulfonamides.
Celem badań było określenie możliwości wykorzystania procesu fotokatalitycznego do degradacji leków sulfonamidowych w roztworach wodnych oraz do zmniejszenia ich toksyczności i zwiększenia podatności na biodegradację. Proces fotokatalityczny inicjowany za pomocą promieniowania UV-A oraz światła słonecznego prowadzono w otwartych reaktorach zawierających katalizator (zawiesinę TiO2) oraz roztwory pięciu wybranych sulfonamidów. W roztworach uzyskanych po fotokatalitycznej degradacji oznaczano: stężenie sulfonamidów (metodą HPLC), stężenie ogólnego węgla organicznego (OWO) oraz zmiany chemicznego (ChZT) i 5-dobowego biochemicznego (BZT5) zapotrzebowania na tlen. Ponadto, sulfonamidy i produkty ich fotokatalitycznej degradacji oceniano pod względem ich toksyczności wobec Chlorella vulgaris oraz podatności na biodegradację (BZT5/ChZT). Stwierdzono, że w stosowanych warunkach wszystkie badane sulfonamidy ulegały fotokatalitycznej degradacji ze zmniejszeniem OWO i ChZT roztworów. Jednocześnie produkty tego procesu okazały się mniej toksyczne i bardziej podatne na biodegradację niż wyjściowe sulfonamidy.
Źródło:
Ecological Chemistry and Engineering. A; 2009, 16, 4; 327-336
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Mössbauer and X-Ray Studies οf the Spinel Ferrites $Cu_{0.5}Fe_{0.5}Cr_2Se_4$ and $Cu_{0.2}Fe_{0.8}Cr_2Se_4$ Prepared by the Ceramic Method
Autorzy:
Maciążek, E.
Hanc, A.
Sitko, R.
Zawisza, B.
Jendrzejewska, I.
Mrzigod, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811603.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
61.66.Fn
82.80.Ej
75.50.Gg
Opis:
Seleno-spinels with nominal chemical composition $Cu_{0.5}Fe_{0.5}Cr_2Se_4$ and $Cu_{0.2}Fe_{0.8}Cr_2Se_4$ were prepared as polycrystalline samples using ceramic method. The assumed composition was verified by wavelength-dispersive X-ray fluorescence spectrometry. The X-ray analysis was carried out in order to make phase analysis and to compare its results with those obtained with the Mössbauer spectroscopy.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1599-1603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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