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Wyświetlanie 1-15 z 361
Tytuł:
"Mechanical Alloying-Compaction-Electroplating" as Technological Scheme for the Development of Nanocomposite Coatings
Autorzy:
Popov, V.
Powiązania:
https://bibliotekanauki.pl/articles/1375576.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Pq
81.05.Ni
81.20.Ev
Opis:
A novel technique of producing composite electrochemical coatings with non-agglomerated nanodiamond reinforcing particles uniformly distributed in the matrix was developed. The technique is intended for coatings to be applied by transferring material from the anode to the cathode. The anode is fabricated using the mechanical alloying method that enables a composite with the uniform distribution of non-agglomerated nanoparticles to be formed.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 1005-1007
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$\text{}^{119}$Sn Hyperfine Fields in RMn$\text{}_{6}$Sn$\text{}_{6}$ (R = Mg, Zr, Hf). Experimental and Theoretical Study
Autorzy:
Mazet, T.
Toboła, J.
Venturini, G.
Malaman, B.
Powiązania:
https://bibliotekanauki.pl/articles/2013348.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.Jx
76.30.Lh
71.15.Mb
75.20.En
Opis:
We performed both $\text{}^{119}$Sn Möossbauer experiments and electronic structure calculations using the Korringa-Kohn-Rostoker method on the hexagonal RMn$\text{}_{6}$Sn$\text{}_{6}$ (R = Mg, Zr, and Hf) compounds. According to previous neutron diffraction results two types of commensurate magnetic order are investigated: ferromagnetic for R = Mg and antiferromagnetic for R = Zr and Hf. From $\text{}^{119}$Sn Möossbauer measurements, high transferred hyperfine fields on the tin nuclei are observed. The H$\text{}_{hf}$ values are well supported by the Korringa-Kohn- Rostoker results. Moreover, the calculated μ$\text{}_{Mn}$ are in good agreement with the neutron diffraction data. When observing the density of states, ZrMn$\text{}_{6}$Sn$\text{}_{6}$ is found near semimetallic limit.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 737-740
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of the structural, electronic, optical and elastic properties of wurtzite, zinc-blende and rock salt TlN: A DFT study
Autorzy:
Farzan, M.
Elahi, S.
Salehi, H.
Abolhassani, M.
Powiązania:
https://bibliotekanauki.pl/articles/1159035.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.-b
78.20.Ci
62.20.Dc
Opis:
In this article we investigated structural, electronic, elastic, and optical properties of TlN in three phases, using full potential linear augmented plane wave method in the density functional theory frame with WIEN2k code. The calculations have been done in the generalized Perdew-Burke-Ernzerhof generalized gradient approximation, the generalized Wu-Cohen gradient approximation, the generalized Perdew-Burke-Ernzerhof solid gradient approximation, local density approximation, and the modified Becke-Johnson approximations. In spite of the absence of any experimental data for TlN, our results are compared with other results achieved by other different approximations which shows a good agreement with them. The band gap for TlN in wurtzite and zinc-blende are obtained to be 0.07 and 0.09 eV within modified Becke-Johnson-local density approximation+spin-orbit approximation, respectively. The structural properties such as phase transitions, equilibrium lattice parameters, bulk modulus and its first pressure derivative were obtained using an optimization method. Moreover, we calculated quantities such as elastic constants, the Young modulus, shear modulus, the Poisson ratio, and sound velocities for longitudinal and transverse waves, the Debye temperature and the Kleinman parameters in different approximations and we show that TlN is softer than other nitrides of the III-group. The static calculations predicted that wurtzite to rock salt and zinc-blende to rock salt phase transitions occur at 14.7 GPa and 15.8, respectively. The optical properties of TlN in three phases, calculated in generalized gradient approximation and local density approximation and imaginary part of dielectric function show that TlN in wurtzite and zinc-blende phases have semiconductor properties but rock salt phase do not show. As well as, we investigate the influence of the hydrostatic pressure on the elastic parameters and energy band structures for TlN (zinc-blende) within local density approximation.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 758-768
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A First Principle Study of Antifluorite $Be_2X$ (X = C, Si) Polymorph
Autorzy:
Yan, H.
Wei, Q.
Chang, S.
Guo, P.
Powiązania:
https://bibliotekanauki.pl/articles/1505408.pdf
Data publikacji:
2011-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.Nr
78.20.Ci
Opis:
The crystal structure, electronic, and mechanical properties of antifluorite $Be_2X$ (X = C, Si) are calculated using the first-principles method based on density functional theory. Our calculated lattice parameters at equilibrium volume are in good agreement with the experimental data and other theoretical calculations. In order to obtain further information, the mechanical properties including bulk modulus, shear modulus, Young's modulus, and Poisson's ratio are deduced from calculated elastic constants. Meanwhile, the sound velocity and Debye temperature are also predicted. The bonding nature in $Be_2X$ (X = C, Si) is a complex mixture of covalent and ionic characters.
Źródło:
Acta Physica Polonica A; 2011, 119, 3; 442-446
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Approach to Deriving Interatomic Many-Body Interactions in Metals
Autorzy:
Gurskii, Z.
Krawczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1992708.pdf
Data publikacji:
1998-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Nc
71.15.Hx
34.20.Cf
Opis:
An original method of treating the kinetic and exchange-correlation energies functionals in terms of many particle interactions was developed. It is based on utilizing the local density approximation. The total electron density, extracted from the ab initio band structure calculations, is expressed as a linear superposition of contributions from the individual pseudoions embedded in the uniform background. The explicit expressions for the pair and triplet potentials are presented. The general form for the part of the pair interatomic interactions caused by the kinetic and the exchange-correlation effects is obtained. Relationship between the developing approach and the perturbation theory in pseudopotential is analysed. Unlike the perturbation theory the advanced approach allows one to calculate accurately the so-called reducible contributions to the pair potential arising from the n -particle (n>2) interactions. It corresponds to summing certain series in pseudopotential. Contribution of the electron-nonlocal pseudopotential interactions to the pair interatomic ones is considered within the concept of the fully separable pseudopotentials.
Źródło:
Acta Physica Polonica A; 1998, 94, 4; 671-682
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab initio Calculation of Quasi-Equilibrium Microcracks in Cubic Boron Nitride
Autorzy:
Góra, D.
Parlinski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2035553.pdf
Data publikacji:
2002-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
75.50.Ee
62.20.Mk
Opis:
A crack in cubic boron nitride crystal was simulated within the ab initio density-functional theory. The lattice constant, critical stress intensity factor K$\text{}_{c}$, which describes crack creation stress, and fracture surface energy Γ were calculated from the elongated 2×6×1 supercell and these quantities agree quite well with the experimental data. We conclude that density-functional theory can be used to estimate crack's material constants.
Źródło:
Acta Physica Polonica A; 2002, 102, 3; 437-442
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab initio Calculations of Phonon Dispersion Relations in Aluminium
Autorzy:
Scharoch, P.
Parliński, K.
Kiejna, A.
Powiązania:
https://bibliotekanauki.pl/articles/2012957.pdf
Data publikacji:
2000-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.-e
71.15.Nc
Opis:
A direct method and ab initio force constants were used to calculate phonon dispersion curves and phonon density in Al. The force constants were determined from the Hellmann-Feynman forces induced by the displacement of an atom in the 2×2×2 fcc crystallographic supercell. This size of the supercell gives exact phonon frequencies at Γ, X, L, W points of the Brillouin zone. The calculated phonon dispersion curves are in good agreement with the experimental data.
Źródło:
Acta Physica Polonica A; 2000, 97, 2; 349-354
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab Initio Studies on Structural, Elastic, Thermodynamic and Electronic Properties of FeCrAs under Pressures
Autorzy:
He, De-Chun
Peng, Yong
He, Yong-Wei
Powiązania:
https://bibliotekanauki.pl/articles/1400506.pdf
Data publikacji:
2015-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
65.40.Ba
65.40.De
72.15.-v
Opis:
The structural, elastic, thermodynamic and electronic properties of nonmetallic metal FeCrAs are studied within density function perturbation theory. The thermodynamic properties of FeCrAs were deduced based on phonon frequencies within the framework of the quasiharmonic approximation. The calculated elastic modulus under various pressures indicates that FeCrAs is mechanically stable under pressure. The pressure-dependence of bulk and shear modulus, transverse and longitudinal sound velocities V (i.e. $V_{S}$ and $V_{L}$), elastic Debye temperature $\Theta_{E}$ of FeCrAs have also been investigated. The calculated values of B/G indicate that FeCrAs presents high ductility under pressure. However, it is interesting that the value of B/G reaches a maximum under 40 GPa and almost remains unchanged when the pressure is above 70 GPa. The calculations show that the heat capacity $C_{V}$ of this material is close to the Dulong-Petit limit 3R (about 224.61 J $mol^{-1} K^{-1}$) at high temperature regime. The analysis of electronic properties find that as the pressure increases, the absolute value of charge for As and Fe atom increases while Cr remains nearly a constant, indicating that the mechanic properties of FeCrAs under pressure should be mostly attributed to the interaction between Fe and As atoms.
Źródło:
Acta Physica Polonica A; 2015, 127, 6; 1637-1644
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Benzene on 4H-SiC (0001) Surface: First Principles Calculations
Autorzy:
Tokár, K.
Majewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1403649.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.43.-h
73.20.-r
77.84.Jd
31.15.A-
Opis:
We study adsorption of the benzene molecule on the Si terminated (0001) surface of 4H-SiC by performing first principles calculations in the framework of density functional theory. We find out that chemical reaction leading to the chemisorption of benzene on the surface has endothermic character. The adsorbed benzene molecule is bounded to two surface Si atoms and it does not lose its integrity, however, it undergoes strong deformations and causes distortion of the substrate. We analyze also changes in the electronic structure caused by benzene adsorption.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1049-1051
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AKTA LOKALNE, KSIĘGI METRYKALNE I INNE DOKUMENTY DIECEZJI RZESZOWSKIEJ W ZASOBIE ARCHIWUM DIECEZJALNEGO IM. ARCYBISKUPA JERZEGO ABLEWICZA W TARNOWIE
LOCAL FILES, METROLOGY BOOKS AND OTHER DOCUMENTS OF THE DIOCESE OF RZESZÓW IN THE RESOURCES OF THE DIOCESAN ARCHIVES ARCHBISHOP JERZY ABLEWICZ IN TARNÓW
Autorzy:
Glugla, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/490241.pdf
Data publikacji:
2017
Wydawca:
Instytut Teologiczno-Pastoralny im. św. bpa Józefa Sebastiana Pelczara
Tematy:
archiwalia kościelne, wykaz, diecezja tarnowska, diecezja rzeszowska, Archiwum Diecezjalne im. Arcybiskupa Jerzego Ablewicza w Tarnowie, XV-XX w.
church archives, list, Diocese of Tarnów, diocese of Rzeszów, Diocese Archive Archbishop Jerzy Ablewicz in Tarnów, 15th-20th centuries
Opis:
The stock of local acts, books and other documents produced in parishes of the diocese of Tarnów since 1992 to the Diocese of Rzeszów and located in the resources of the Diocese Archive in Tarnów is substantial. Metric books (baptized, married and deceased) cover the nineteenth and twentieth centuries. Some of them refer only to the nineteenth century. Moreover, documents from the departments of the deacon and canonical visits allow us to draw up an account of the history of particular parishes and deanships over the centuries. They provide valuable source material for research not only in the history of the Church, dioceses, but also in other departments of science. They are also an indisputable proof of the religiousness of the Diocese and the work of the clergy among the faithful.
Źródło:
Resovia Sacra : Studia Teologiczno-Filozoficzne Diecezji Rzeszowskiej; 2017, 24; 83-113
1234-8880
Pojawia się w:
Resovia Sacra : Studia Teologiczno-Filozoficzne Diecezji Rzeszowskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular Distribution of Bremsstrahlung Photons in Ta Target for 40 MeV Electron Beam
Autorzy:
Demir, N.
Kuluöztürk, Z.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1402503.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Jj
23.20.En
Opis:
Bremsstrahlung photons are created by electron beams de-accelerating in electric field (coupling with a thin radiator) and are used in a variety of different fields. In nuclear physics experiments it is important to transport and focus the created photon beam into the experimental cavity. Here angular distribution of the photon beam is one of the important parameters, which should be known. In this study a FLUKA simulation has been done to obtain angular distribution of photon beam created by interaction of 40 MeV electron beam with the tantalum (Ta) radiator of varied thickness, which is planned to be used in bremsstrahlung photon facility at TARLA (Turkish Accelerator and Radiation Laboratory in Ankara). TARLA will be the first facility of Turkish Accelerator Center project.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-443-B-444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 361

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