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Wyświetlanie 1-15 z 70
Tytuł:
Monte Carlo Calculations for Photon Attenuation Studies on Different Solid Phantom Materials
Autorzy:
Gundogdu, O.
Tarim, U.
Gurler, O.
Powiązania:
https://bibliotekanauki.pl/articles/1031097.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
21.60.Ka
25.20.Dc
87.66.Xa
25.60.Dz
29.27.Eg
Opis:
The linear attenuation coefficients of water and some solid phantom materials, namely of solid water RMI-457, of plastic water, of RW3 solid water, and of Perspex were determined by Monte Carlo calculations, for gamma-ray photons with energies of 59.5, 80.9, 140.5, 356.5, 661.6, 1173.2, and 1332.5 keV. The calculated values were compared with the experimental results presented by other researchers and with theoretical values obtained using the XCOM database. Good agreement was observed between the calculations, the experimental, and the theoretical values. The results indicate that the process in Monte Carlo code can be followed to determine the equivalency of other materials at several energies. Three shielding factors such as half-value layer, tenth-value layer, and mean free path were calculated at all considered gamma-ray energies.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1032-1035
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of coherent synchrotron radiation in bunch compressor of TARLA
Autorzy:
Yildiz, H.
Aksoy, A.
Arikan, P.
Powiązania:
https://bibliotekanauki.pl/articles/1070217.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.27.Bd
29.27.-a
29.20.Ej
41.60.-m
41.60.Cr
41.85.Ja
41.85.-p
07.55.Db
02.10.Yn
Opis:
High order and non-linear effects in accelerator beamline play an important role in the transport of the beam. These effects cause variation of designed beam parameters such as emittance growth, bunch length variation, beam halo formation, etc. One of the known non-linear effects in bunch compressors is the coherent synchrotron radiation effect. In this study we focus on coherent synchrotron radiation effect in Turkish Accelerator and Radiation Laboratory in Ankara (TARLA) machine which is designed to drive Infrared Free Electron Laser, covering the range of 3-250 μm. We additionally discuss high order effects in bunch compressor of TARLA.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 214-216
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mędrzec – ideał człowieka poszukującego mądrości (Syr 14,20 – 15,10). Część I: Działanie mędrca (Syr 14,20-27)
The Sage – The Model of a Wisdom-Seeker (Sir 14:20–15:10). Part I: The Sage’s Actions (Sir 14:20-27)
Autorzy:
Piwowar, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1053653.pdf
Data publikacji:
2016-04-25
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
Księga mądrości Syracha
Syr 14
20 – 15
10
20-27
mądrość
poszukiwanie mądrości
mędrzec
The Book of Sirach
Sir 14
20–15
wisdom
seeking wisdom
sage.
Opis:
In Sir 14:20 – 15:10 Sirach continues his teachings concerning the acquisition of wisdom (cf. 1:1-10; 4:16-19 and 6:18-37) (the exegetico-theological analysis conducted in this article is based on the Greek version of the fragment). In the pericope the author presents the sage as a model and an example to follow for all those who wish to acquire wisdom. The pericope under analysis here comprises two parts. The present article focuses on the first one (14:20-27), in which Sirach concentrates on the actions the sage undertakes to acquire wisdom. The second section (15:1-10) in turn makes use of three metaphors to present the actions of wisdom throughout the process of a man’s search for it. The first part of the pericope (14:20-27) can be further divided into three sections. In the first one (14:20-21) Sirach praises the man who seeks wisdom, emphasizing his intellectual engagement (in the form of contemplating or pondering) as the basis for reaching the aim and finding wisdom. The second part (14:22-25) presents the actions aimed at acquiring wisdom with the use of three metaphors: the first is that of hunting (14:22), and the second – that of spying (14:23), even though verses 21:23-24 include a prohibition and a harsh reprimand against peeping or eavesdropping. The third metaphor, the most developed of all three, refers to camping next to wisdom (14:24-25). In the final section of part one (14:26-27) Sirach presents the promises made to those who strive to acquire wisdom, namely protection from danger and living close to wisdom.
Źródło:
The Biblical Annals; 2016, 6, 2; 183-225
2083-2222
2451-2168
Pojawia się w:
The Biblical Annals
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Energy Deposition and Dose Distributions on Collimator under Photon Beam
Autorzy:
Demir, N.
Kuluöztürk, Z.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1402435.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.27.-a
29.20.Ej
Opis:
The bremsstrahlung photon facility where photon beam can be created via bremsstrahlung processes has been installed in many different accelerator in the world. TARLA (Turkish Accelerator and Radiation Laboratory at Ankara) will be first facility of TAC (Turkish Accelerator Center) project in Turkey. An optimal design of collimator is important for obtain a clean high energy photon beam in a bremsstrahlung facility. In this study the photon spectrum has been obtained depending on the entrance angle of the collimator. The energy deposition and dose distributions on the collimator by photon beam generated from 30 MeV energy electron beam have been calculated with FLUKA Monte Carlo simulation code.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-400-B-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anderson-Kondo Lattice Hamiltonian from the Anderson-Lattice Model: A Modified Schrieffer-Wolff Transformation and the Effective Exchange Interactions
Autorzy:
Kądzielawa-Major, E.
Spałek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1374041.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
71.20.Eh
71.27.+a
71.70.Gm
Opis:
We derive the Anderson-Kondo lattice model by applying canonical perturbation expansion for the Anderson-lattice model in direct space. The transformation is carried out up to the fourth order by a modified Schrieffer-Wolff transformation: we separate the part of hybridization term responsible for the high-energy processes (involving the largest in-the-system intraatomic Coulomb interaction between f electrons) and replace it with the virtual processes in higher orders. The higher-order processes lead to three separate exchange interactions. The obtained Hamiltonian contains both the Kondo (f-c) and the superexchange (f-f) interactions, as well as a residual hybridization responsible for the heavy-quasiparticle formation. This effective Hamiltonian can be used to analyze the magnetic or the paired states, as well their coexistence in heavy-fermion systems. The magnitudes of both the Kondo exchange and the superexchange integrals are estimated as a function of bare hybridization magnitude.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-100-A-103
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First-Principles Study of Kondo Insulator $SmB_{6}$
Autorzy:
Gmitra, M.
Čenčariková, H.
Farkašovský, P.
Powiązania:
https://bibliotekanauki.pl/articles/1369765.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.28.+d
71.20.-b
71.27.+a
Opis:
We applied the Perdew-Burke-Ernzerhof hybrid functional (PBE0) within the density functional theory (DFT) to study electronic properties of the heavy fermion Kondo semiconductor $SmB_{6}$. The calculation of the Hartee-Fock exchange contribution to the exact-exchange within the atomic sphere approximation for bulk $SmB_{6}$ represents a computationally efficient, parameter-free method that provides good qualitative and quantitative agreement with photoemission experiments. Specifically, we found an energy difference of 7 eV between the occupied and unoccupied correlated Sm f states. Furthermore, the spin-orbit coupling yields a splitting of the occupied Sm f states of about 1 eV in agreement with recent angular resolved photoemission spectroscopy. The electronic spectrum in the vicinity of the X point shows a hybridization between the Sm 5d conduction band and the localized Sm 4f states at the Fermi level. This might lead to a transport gap opening.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 298-299
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Accelerated Particle Beam in Isochronous Cyclotron
Autorzy:
Voronin, A.
Partyka, J.
Aldibekova, A.
Powiązania:
https://bibliotekanauki.pl/articles/1381861.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
29.27.Bd
29.20.dg
41.85.-p
Opis:
In the paper there are given calculated and experimental data which allow to form necessary beam parameters for a precise experiment in nuclear physics. An intensity of a beam extracted from an isochronous cyclotron acceleration chamber ($E_{p}$ = 30 MeV) can reach 15 μA with an energy spread of 3 × $10^{-3}$. Accelerated ion beams of such kind are widely applicable in nuclear physical experiments.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1408-1411
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valence Band of $Ce_2Co_{0.8}Si_{3.2}$ and $Ce_2RhSi_3$ Studied by Resonant Photoemission Spectroscopy and FPLO Calculations
Autorzy:
Starowicz, P.
Kurleto, R.
Goraus, J.
Walczak, Ł.
Penc, B.
Adell, J.
Szlawska, M.
Kaczorowski, D.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1374249.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
75.30.Mb
71.20.Eh
74.25.Jb
Opis:
This work presents studies of the valence band of two Kondo lattice systems: $Ce_2Co_{0.8}Si_{3.2}$, which is paramagnetic with the Kondo temperature $T_{K}$ ≈50 K and $Ce_2RhSi_3$, which is antiferromagnetic below $T_{N}$=4.5 K and exhibits $T_{K}$ ≈9 K. The photoemission spectra, which are obtained with photon energy tuned to Ce 4d-4f resonance, reveal a Kondo peak at the Fermi energy $(E_{F})$, its spin-orbit splitting partner at 0.24 eV and a broad maximum related to Ce $f^0$ final state. The spectra indicate that Kondo peak has a higher intensity for $Ce_2Co_{0.8}Si_{3.2}$. The off-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards $E_{F}$ for $Ce_2Co_{0.8}Si_{3.2}$ as compared to $Ce_2RhSi_3$. Full-potential local-orbital calculations were realized with local spin density approach +U approach for 213 stoichiometry. They show that a higher density of states near $E_{F}$ is observed for $Ce_2CoSi_3$. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of $Ce_2RhSi_3$ and $Ce_2CoSi_3$, respectively.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-144-A-147
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of CePtIn and LaPtIn Compounds
Autorzy:
Jezierski, A.
Penc, B.
Szytuła, A.
Winiarski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1419892.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.20.Lp
71.27.+a
79.60.-i
Opis:
The electronic structure of the ternary RPtIn (R = La, Ce) compounds, which crystallize in the hexagonal ZrNiAl-type structure, was studied by X-ray photoelectron spectroscopy measurements and calculation using the ab initio methods (linear muffin-tin orbital in the atomic sphere approximation, full potential linear muffin-tin orbital, full potential linear orbital). The results showed that the valence band in these compounds is formed by the Pt 5d and In 5s and 5p states. The band calculations with spin-orbit coupling have shown that the Ce 4f peaks consist of two peaks above the Fermi level that correspond to the $Ce 4 f_{7/2}$ and $4 f_{5/2}$ doublet and wide peaks corresponding to the La 4f states. The analysis of Ce 3d spectra on the basis of the Gunnarsson-Schönhammer model gives hybridization of 4f orbitals with the conduction electron band equal to 170 meV.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 212-215
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Heavy Fermion and Spin-Glass Behavior to Magnetic Order in $CeT_4M$ Compounds
Autorzy:
Toliński, T.
Kowalczyk, A.
Falkowski, M.
Synoradzki, K.
Chełkowska, G.
Hoser, A.
Rols, S.
Powiązania:
https://bibliotekanauki.pl/articles/1426703.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.27.+a
75.30.Mb
75.30.Cr
75.50.Lk
78.70.Nx
Opis:
We report on the transitions between the ferromagnetic order, spin-glass behavior, heavy fermion and fluctuating valence state in a series of isostructural compounds $CeT_4M$ (T = Ni, Cu; M = Al, Ga, Mn). The dilution of Ce or the T and M elements allowed us to follow the physical properties evolution employing the measurements of the heat capacity, dc magnetic susceptibility, frequency dependent ac magnetic susceptibility, magnetization relaxation, inelastic neutron scattering and also the X-ray photoemission spectroscopy. It is shown that the Mn rich compounds lean towards the spin glass behavior. For the compounds governed by the close to localization Ce 4f states the effect of the crystal electric field has been studied. It has been shown that the spin glass-like behavior can significantly influence the physics of the $CeT_4M$ compounds.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1014-1018
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lanthanide Contraction in $RENi_5$ (RE~=~La, Ce, Nd, Sm, Eu, Gd, Tb,~Yb) Compounds Studied with Band Structure Calculations
Autorzy:
Goraus, J.
Maślankiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1426989.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.Lp
71.27.+a
31.15.E-
Opis:
Full potential linearized augmented plane wave band structure calculations were performed for hexagonal $RENi_5$ (RE = rare earth) compounds in order to investigate reproducibility of lanthanide contraction by ab initio studies. The a and c parameters were optimised using a paraboloid fit, starting from the same initial values for all compounds studied. The trend in lattice parameters across the RE series obtained from the calculations was found to be in general agreement with experimental data. A comparison of results obtained by generalized gradient approximation and generalized gradient approximation with additional Coulomb correlations calculations is presented for several double counting schemes.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1076-1078
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the BCS-BEC Crossover in the 2D Asymmetric Attractive Hubbard Model
Autorzy:
Kujawa-Cichy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1426931.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Fd
74.20.Rp
71.27.+a
71.10.Hf
Opis:
We analyze the evolution from the weak coupling (BCS-like limit) to the strong coupling limit of tightly bound local pairs in the 2D asymmetric attractive Hubbard model, in the presence of the Zeeman magnetic field (h). The broken symmetry Hartree approximation is used. We also apply the Kosterlitz-Thouless scenario to determine the phase coherence temperatures. We obtain that for the spin dependent hopping integrals $(t^{↑} ≠ t^{↓})$ the homogeneous polarized superfluid $(SC_{M})$ phase in the ground state for the strong attraction and lower filling can be stabilized. We find a topological quantum phase transition (the Lifshitz type) from the unpolarized superfluid phase $(SC_0)$ to $SC_{M}$ and tricritical point in the (h - μ) and spin polarization (P) vs. attraction (U < 0) ground state phase diagrams. The finite temperatures phase diagrams for $t^{↑} ≠ t^{↓}$ are constructed.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1066-1069
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 70

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