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Wyświetlanie 1-15 z 47
Tytuł:
2D $B_xC_{1-x}$ Layers as Predicted by the Cluster-Expansion Approach
Autorzy:
Gonzalez Szwacki, N.
Powiązania:
https://bibliotekanauki.pl/articles/1377248.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.-p
36.40.-c
Opis:
In this work, the cluster-expansion method combined with extensive first-principles calculations is used for predicting the most stable 2D $B_xC_{1-x}$ (x ≤0.5) layers. For concentrations of B up to ≈ 38%, the honeycomb structure of the boron-carbon compound is preserved, whereas for larger concentrations, the boron atoms tend to form 2D clusters and/or ribbons that are fragments of a triangular boron sheet. Our studies indicate that the incorporation of boron into graphene is energetically unfavorable even for low concentrations of B, however, the graphene-like structure of the $B_xC_{1-x}$ layer may be stabilized by a metallic substrate.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1215-1217
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparison of Different Approximate Two-Component Relativistic Theories of Many-Electron Systems: A Case Study of the Ionization Energies of Two-Electron Ions
Autorzy:
Barysz, M.
Flocke, N.
Karwowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2027386.pdf
Data publikacji:
2001-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.-p
31.30.Jv
Opis:
The corrections to the ionization energies of two-electron ions due to relativistic effects are studied by different two-component relativistic methods. In particular, the results obtained by the standard Pauli-Cowan-Griffin method and by two variants of the Douglas-Kroll-Hess method (the one based on the free-particle transformation and the one in which the transformation accounts for the nuclear potential) are compared with those calculated using the four-component Dirac-Fock method. Limits of applicability of each of these methods have been indicated. Results acceptable in the whole range of the nuclear charge (relativistic corrections accurate up to 4% for Z≤85) are given only by the Douglas-Kroll-Hess method which goes beyond the free-particle transformation. Each of the other two approaches either underestimates or overestimates the corrections due to relativistic effects.
Źródło:
Acta Physica Polonica A; 2001, 99, 6; 631-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Explicit Analytic Solution to the Thomas-Fermi Equation by the Improved Differential Transform Method
Autorzy:
Fatoorehchi, H.
Abolghasemi, H.
Powiązania:
https://bibliotekanauki.pl/articles/1198516.pdf
Data publikacji:
2014-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Hq
02.30.Mv
02.60.Lj
21.10.Ft
31.15.-p
Opis:
In this paper, a newly proposed analytical scheme by the authors namely the improved differential transform method is employed to provide an explicit series solution to the Thomas-Fermi equation. The solution procedure is very straightforward, requiring merely elementary operations together with differentiation, and ends up in a recursive formula involving the Adomian polynomials to afford the unknown coefficients. Unlike many other methods, our approach is free of integration and hence can be of computational interest. In addition, a very good agreement between the proposed solution and the results from several well-known works in the literature is demonstrated.
Źródło:
Acta Physica Polonica A; 2014, 125, 5; 1083-1087
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytic Approximations for Thomas-Fermi Equation
Autorzy:
El-Nahhas, A.
Powiązania:
https://bibliotekanauki.pl/articles/1812056.pdf
Data publikacji:
2008-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Hq
02.30.Mv
02.60.Lj
21.10.Ft
31.15.-p
Opis:
In this paper, we give an analytic approximation to the solution of the Thomas-Fermi equation using the homotopy analysis method and with the use of a polynomial exponential basis.
Źródło:
Acta Physica Polonica A; 2008, 114, 4; 913-918
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Representation of Total Cross-Sections for Electron Atom Scattering: Application to Atomic Helium
Autorzy:
Mansouri, A.
Houamer, S.
Moulay, M.
Powiązania:
https://bibliotekanauki.pl/articles/2036874.pdf
Data publikacji:
2003-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.-p
02.70.-c
Opis:
Based on the series expansion formalism, an analytical approach is proposed to evaluate the total cross-sections induced by electron impact excitation. As an illustration, an analytical expression of the total cross-section of the double excitation of helium atom by electron impact is obtained for the 2p$\text{}^{2}$ $\text{}^{3}$P and 2p3p $\text{}^{1}$P transitions within the framework of the distorted wave Born approximation. The available experimental data are well reproduced by the obtained expression of the total cross-section which is function of the only parameter of the incident electron energy. Comparisons are also made with numerical calculations.
Źródło:
Acta Physica Polonica A; 2003, 104, 1; 25-34
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of 1H and 31P NMR to topological description of a model of biological membrane fusion Topological description of a model of biological membrane fusion
Autorzy:
Janiak-Osajca, Agnieszka
Timoszyk, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1039735.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
vesicle
topology
fusion
31P-NMR
1H-NMR
Opis:
The process of biological membrane fusion can be analysed by topological methods. Mathematical analysis of the fusion process of vesicles indicated two significant facts: the formation of an inner, transient structure (hexagonal phase - HII) and a translocation of some lipids within the membrane. This shift had a vector character and only occurred from the outer to the inner layer. Model membrane composed of phosphatidylcholine (PC), phosphatidylethanolamine (PE) and phosphatidylserine (PS) was studied. 31P- and 1H-NMR methods were used to describe the process of fusion. 31P-NMR spectra of multilamellar vesicles (MLV) were taken at various temperatures and concentrations of Ca2+ ions (natural fusiogenic agent). A 31P-NMR spectrum with the characteristic shape of the HII phase was obtained for the molar Ca2+/PS ratio of 2.0. During the study, 1H-NMR and 31P-NMR spectra for small unilamellar vesicle (SUV), which were dependent on time (concentration of Pr3+ ions was constant), were also recorded. The presence of the paramagnetic Pr3+ ions permits observation of separate signals from the hydrophilic part of the inner and outer lipid bilayers. The obtained results suggest that in the process of fusion translocation of phospholipid molecules takes place from the outer to the inner layer of the vesicle and size of the vesicles increase. The NMR study has showed that the intermediate state of the fusion process caused by Ca2+ ions is the HII phase. The experimental results obtained are in agreement with the topological model as well.
Źródło:
Acta Biochimica Polonica; 2012, 59, 2; 219-224
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atomic Properties of the Two-Electron System using Variational Monte Carlo Technique
Autorzy:
Doma, S.
El-Gammal, F.
Powiązania:
https://bibliotekanauki.pl/articles/1419666.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.-c
31.15.-p
31.15.B-
Opis:
Using variational Monte Carlo method we calculated the lowest order relativistic corrections for the ground state energies of the helium-like atoms, up to Z = 10, and also for some excited state energies of the helium atom. These relativistic corrections include: mass-velocity effect, orbit-orbit interaction, spin magnetic and dipole moments of the two electrons and the Darwin effect. Moreover, correction due to the nucleus motion has been also calculated. Our results were obtained by using two new types of compact and accurate trial wave functions for the helium ions. For excited states we used simple trial wave functions of good quality and accurate results. The obtained results are in good agreement with the most recent previous accurate values and also with the exact values.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 42-48
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aἰώνιος w literaturze helleńskiej: od Platona do Pseudo-Timajosa
The αἰώνιος in Hellenic Literature: From Plato to Pseudo-Timaeus
Autorzy:
Osek, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1044314.pdf
Data publikacji:
2019-12-27
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
αἰώνιος
semantyka
literatura helleńska
okres klasyczny (510-323 p.n.e.)
okres hellenistyczny (323-31 p.n.e.)
semantics
ancient Greek literature
Classical period (510-323 BCE)
Hellenistic period (323-31 BCE)
Opis:
Przedmiotem niniejszego artykułu jest analiza semantyczna greckiego wyrazu αἰώνιος w literaturze helleńskiej od jej początków do czasów powstawania Nowego Testamentu. Po raz pierwszy termin αἰώνιος wystąpił w Państwie Platona, zaś po Platonie był używany przez helleńskich filozofów, poetów i historyków. Cześć pierwsza artykułu przedstawia etymologię αἰώνιος, część druga – analizę semantyczną tego wyrazu w dialogach Platona, część trzecia – jego znaczenie w filozofii po Platonie, część czwarta – w poezji hellenistycznej, część piąta – w historiografii hellenistycznej. Część szósta zawiera przegląd haseł leksykonów bizantyńskich, w których wystąpił wyraz αἰώνιος. Analiza semantyczna użycia αἰώνιος w literaturze helleńskiej (IV wiek p.n.e. – I wiek n.e.) prowadzi do wniosku, że termin ten w żadnym kontekście nie oznacza czegoś, co jest naprawdę wieczne, tj. bez początku i końca, lecz coś innego: długowieczne, długotrwałe, wiecznotrwałe, nieustanne, niekończące się, nieprzerwane, wieczyste, niezniszczalne, niezmienne. Na 60 wystąpień zaledwie osiem odnosi się do eschatologicznych kar w Hadesie, zaś trzy kolejne dotyczą eschatologicznych nagród. W żadnym z nich nie chodzi o kary czy nagrody, które byłyby faktycznie bez końca, lecz raczej o takie, które będą długotrwałe.
A subject of this article is the semantic analysis of the Greek word αἰώνιος in Hellenic literature from its beginning to the composition of the New Testament. For the first time, the word αἰώνιος occurred in Plato’s Republic, and after Plato the term was re-used by the ancient Greek philosophers, poets, and historians. Part one of the paper shows the etymology of the αἰώνιος, part two discusses the semantics of the word in Plato’s dialogues, part three – its meaning in the post-Platonic philosophy, part four – in the Hellenistic poetry, part five – in the Hellenistic historiography. Part six contains an overview of entries in the Byzantine lexicons that refer to αἰώνιος. The semantic analysis of the αἰώνιος usus in the ancient Greek literature (4th c. BCE – 1st c. CE) leads to the conclusion that the term in any given context does not denote what is really eternal, i.e. without beginning or end, but something else: longeval, long-lasting, perennial, perpetual, endless, unceasing, imperishable, immutable. Among 60 occurrences only eight refer to eschatological punishments in Hades and three different concern eschatological rewards. None of them is about punishments or rewards that would be actually endless, but rather the long-lasting ones.
Źródło:
Verbum Vitae; 2019, 36; 373-407
1644-8561
2451-280X
Pojawia się w:
Verbum Vitae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of Energy Levels Using the Weakest Bound Electron Potential Model Theory
Autorzy:
Zhang, T.
Zheng, N.
Powiązania:
https://bibliotekanauki.pl/articles/1808081.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.55.+b
31.15.-p
Opis:
In this paper, we introduce a new method for calculation of energy levels in detail and give our results for several iso-spectrum-level series as examples: [He] 2s2p $\text{}^{1}P_{1}$, [He] 2s2p $\text{}^{3}P_{0}$, [He] 2s2p $\text{}^{3}P_{2}$, and [He] 2s3s $\text{}^{3}S_{1}$ series of Be-like sequence; [Ne] $\text{}3s^{2}3d$ $\text{}^{2}D_{3//2}$ series and [Ne] $3s^{2}3d$ $\text{}^{2}D_{5//2}$ series of Al-like sequences; [Ne] 4p $\text{}^{2}P_{1//2}$ series, [Ne] 5d $\text{}^{2}D_{5//2}$ series, and [Ne] 6f $\text{}^{2}F_{7//2}$ series of Na-like sequences. In the method I(Z)=$T_\text{lim} (Z)-T(Z,n)$, where I(Z), $T_\text{lim}(Z)$, and T(Z,n) denote ionization potential, series limit, and energy level of a given member, respectively. The expression of non-relativistic part of I(Z) is derived from weakest bound election potential model theory and relativistic effects of I(Z) are included by using a six-order polynomial in Z. Our results are compared with the experimental data and with those obtained by other theoretical method.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 629-635
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 47

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