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Wyświetlanie 1-15 z 29
Tytuł:
The Probability Distribution of Spectral Moments for the Gaussian β-Ensembles
Autorzy:
Maciążek, T.
Joyner, C.
Smilansky, U.
Powiązania:
https://bibliotekanauki.pl/articles/1400562.pdf
Data publikacji:
2015-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Opis:
We derive the joint probability distribution of the first two spectral moments for the Gaussian β-ensemble random matrix ensembles in N dimensions for any N. This is achieved by making use of two complementary invariants of the domain in $\mathbb{R}^N$ where the spectral moments are defined. Our approach is significantly different from those employed previously to answer related questions and potentially offers new insights. We also discuss the problems faced when attempting to include higher spectral moments.
Źródło:
Acta Physica Polonica A; 2015, 128, 6; 983-989
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of the β Phase Flux Dissolution during Quasicrystal Formation
Autorzy:
Surowiec, M.
Bogdanowicz, W.
Sozańska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1373540.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
61.44.Br
Opis:
This study focuses mainly on the verification of a peritectic reaction during the crystallization of quasicrystals. The β and λ phases apparently provide the necessary material for crystallization of the quasicrystalline ψ phase. We present results of an experimental visualization of the evolution of the flux dissolution process of the high temperature β phase. Solidified droplets of the β phase, formed primarily by the surface tension of the liquid within a bubble or a shrinkage, after crumbling during the flux dissolution may contribute to the quasicrystal formation process according to a peritectic reaction: $β_{c}$ + λ + L → ψ, where $β_{c}$ denotes the crumbled β phase immersed in the liquid.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 594-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Dielectric Substrates for High T$\text{}_{c}$ Superconductor Films
Autorzy:
Bhalla, A.
Guo, R.
Powiązania:
https://bibliotekanauki.pl/articles/1964228.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Νg
74.76.Βz
Opis:
Investigations on the design and engineering of candidate substrate materials suitable for high T$\text{}_{c}$ superconductor thin film deposition and applications have yielded several exciting new hosts such as Ba(Mg$\text{}_{1}\text{}_{/}\text{}_{3}$ Ta$\text{}_{2}\text{}_{/}\text{}_{3}$ )O$\text{}_{3}$, Sr(Al$\text{}_{1}\text{}_{/}\text{}_{2}$ Ta$\text{}_{1}\text{}_{/}\text{}_{2}$ )O$\text{}_{3}$, and Sr(Αl$\text{}_{1}\text{}_{/}\text{}_{2}$ Νb$\text{}_{1}\text{}_{/}\text{}_{2}$ )O$\text{}_{3}$. Dielectric properties, thermal expansion coefficients, melting temperatures and growth feasibility were tested for a wide range of substrate materials and solid solutions. These complex perovskite crystals and their associated solid solutions provide new options for ultra low loss, low permittivity substrates with close structural and thermal matching to the YΒa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$. Several new materials have been tested for high Τ$\text{}_{c}$ superconductor film depositions. Α laser heated pedestal growth system has been used as an essential tool in producing single crystals for testing. Development on the predictive capability of the dielectric constant of ionic solids, by improving Shannon's approach, will also be discussed in this paper.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 7-21
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic Constants of β-HgS
Autorzy:
Prieur, J. Y.
Joffrin, J.
Szuszkiewicz, W.
Dynowska, E.
Górecka, J.
Witkowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1992069.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.Dc
64.60.My
Opis:
The elastic constants of single crystals of β-HgS highly doped with iron were directly determined at room temperature from the measurements of ultrasonic wave velocities by the pulse-echo technique. The values of c$\text{}_{11}$=6.750, c$\text{}_{12}$=5.186, and c$\text{}_{44}$=2.42 (given at 10$\text{}^{10}$ N m$\text{}^{-2}$ units) were obtained and compared with the experimental data taken for other mercury chalcogenides. The elastic characteristics of this group of materials is quite similar to those of Cd and Zn chalcogenides.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 487-491
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isovalence Substitutions in Multicomponent Aluminates ABCO$\text{}_{4}$
Autorzy:
Komissarova, L.
Zimina, G.
Spiridonov, F.
Pushkina, G.
Gloubokov, A.
Pajączkowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964531.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Βw
Opis:
The crystallochemical characteristics of polycrystalline samples, Sr$\text{}_{1-x}$La$\text{}_{x}$AlO$\text{}_{4}$, Sr$\text{}_{1-x}$Νd$\text{}_{x}$ΑlO$\text{}_{4}$ (x = 0.02+0.20) and Sr$\text{}_{1-x}$Bi$\text{}_{x}$NdΑlO$\text{}_{4}$ (x = 0.05 ÷ 0.50) prepared by the oxalate coprecipitation and cryochemical technique have been investigated. The existence limits of single-phase states for pairs of elements Sr-Pb (x < 0.05) and Nd-Bi (x < 0.2) were determined. The microprobe X-ray analysis showed the Bi uniform distribution. The dielectric properties of pure SrLaΑlO$\text{}_{4}$, SrLaGaO$\text{}_{4}$ and partial replacement La → Nd samples were measured. It can be concluded that these compounds are suitable as substrate materials of HTSC thin films.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 248-250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Thermoluminescence Glow Peaks in β-Irradiated TlGaSeS Crystals
Autorzy:
Isik, M.
Yildirim, T.
Gasanly, N.
Powiązania:
https://bibliotekanauki.pl/articles/1398929.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Kn
71.55.Ak
61.82.Fk
Opis:
Thermoluminescence properties of TlGaSeS layered single crystals were investigated in the temperature range of 280-720 K. Thermoluminescence glow curve exhibited three peaks with maximum temperatures of ≈370, 437, and 490 K. Curve fitting, initial rise and peak shape methods were used to determine the activation energies of the trapping centers. All applied methods resulted with energies around 0.82, 0.91, and 0.99 eV. Dose dependence of the thermoluminescence intensity was also examined for the doses in the range of 0.7-457.6 Gy. Peak maximum intensity of the observed peak around 370 K showed an increase up to a certain dose and then a decrease at higher doses. This non-monotonic dose dependence was discussed under the light of a reported model in which different kinds of competition between radiative and nonradiative recombination centers during excitation or heating stages of the thermoluminescence process are explained.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1165-1168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perspectives for Highly-Sensitive PET-Based Medical Imaging Using β⁺γ Coincidences
Autorzy:
Thirolf, P.
Lang, C.
Parodi, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402601.pdf
Data publikacji:
2015-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.57.uk
87.57.N-
87.57.C-
Opis:
By employing the triple coincidence between the γ trajectory intersections from β⁺ decaying isotopes emitting a third, prompt, photon ("γ-PET" technique), sub-millimeter spatial resolution can be reached in 3 dimensions for the localization of a point source with a reduced requirement of reconstructed intersections per voxel compared to a conventional PET reconstruction analysis. Results of a Monte-Carlo simulation and image reconstruction study are presented in order to characterize the potential of this technique.
Źródło:
Acta Physica Polonica A; 2015, 127, 5; 1441-1444
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanostructured Thin Films β-Al-Mg Obtained Using PLD Technique
Autorzy:
Radziszewska, A.
Kąc, S.
Feuerbacher, M.
Powiązania:
https://bibliotekanauki.pl/articles/1537943.pdf
Data publikacji:
2010-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
68.55.Nq
81.15.-z
52.38.Mf
Opis:
In this work, the pulsed laser deposition (PLD) technique was used to grow AlMg thin films from a $β-Mg_{2}Al_{3}$ target with nominal composition: 39.09 at.% Mg and 60.91 at.% Al. The paper presents the study of $β-Mg_{2}Al_{3}$ thin films deposited using the pulsed laser deposition technique. AlMg thin films were prepared on Si (400) substrates and deposited by means of using a QS-Nd:YAG laser (λ = 266, 355 nm). Samples were prepared with laser fluence (1.1 J/$cm^{2}$ and 1.6 J/$cm^{2}$) and at two different substrate (Si) temperatures (25°C and 200°C). The target possessed columnar structure and changes in chemical composition took place as a result of the influence of the laser irradiation. Investigations focused on structure and chemical composition showed that the films generally had nanocrystalline structure and that the quantity of Al and Mg varied in the films.
Źródło:
Acta Physica Polonica A; 2010, 117, 5; 799-802
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Thermally Stimulated Luminescence of β -Ga₂O₃ Thin Films
Autorzy:
Bordun, O.
Bordun, B.
Medvid, I.
Kukharskyy, I.
Powiązania:
https://bibliotekanauki.pl/articles/1052882.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
78.60.-b
81.15.-z
Opis:
Thermally stimulated luminescence of X-ray irradiated β -Ga₂O₃ thin films was investigated. An analysis of the form of the elementary contours making the thermally stimulated luminescence curves shows that recombination processes at the thermally stimulated luminescence peaks with maxima at 77, 135, 178, and 235 K in thin films of β -Ga₂O₃ are described in terms of linear kinetics. The spectral composition of the thermally stimulated luminescence of the thin films was studied. Some methods are employed to determine the activation energies and frequency factors corresponding to the thermally stimulated luminescence peaks. It is established that the recombination processes occurring upon release of the trapping centers in thin films β -Ga₂O₃ are conditioned by diffusion-controlled tunneling recombination due to thermally-stimulated migration of V_{k}-centers.-
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 910-913
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Energetics of Fragments of the Planar α and β Boron Sheets
Autorzy:
Gonzalez Szwacki, N.
Tarkowski, T.
Majewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398547.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.-w
68.65.-k
73.22.-f
Opis:
Large scale first principles calculations based on density functional theory and using hybrid exchange-correlation functionals have been performed in order to study the structural properties and the relative stability of fragments of the planar α and β boron sheets. Based on the considered structures, we show that, in contrast to the fragments of the α -sheet, all the fragments of the β -sheet, having more than ≈30 atoms, are fully planar regardless of their shape. We conclude that the β -sheet is the only planar boron sheet reported so far that retains planarity even if it is reduced to relatively small fragments.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-148-A-149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quadrupole Interactions and Anisotropic Magnetic Quenching of Positronium in Oriented Crystals
Autorzy:
Bondarev, I. V.
Kuten, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/1933475.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Βj
36.10.Dr
31.30.Gs
Opis:
The quadrupole interaction of positronium in noncubic defectless crystals has been investigated theoretically. It is shown to lead to the weak anisotropy of positronium magnetic quenching. The temperature dependence of the quadrupole coupling constant and the estimations of the magnitude of the anisotropy are obtained for delocalized positronium in crystalline quartz. The significant magnitude of the anisotropy is predicted for "anomalous" positronium in oriented crystalline polymeric structures.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 83-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence from β-Irradiated Graphene Layers
Autorzy:
Chruścińska, A.
Przegiętka, K. R.
Szroeder, P.
Oczkowski, H. L.
Rozpłoch, F.
Powiązania:
https://bibliotekanauki.pl/articles/2046889.pdf
Data publikacji:
2006-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.60.Kn
78.60.-b
78.67.Ch
81.05.Uw
Opis:
We found that β-irradiated samples of crystallite graphite and multi-walled carbon nanotubes emit light during heating above room temperature. This behaviour is rather surprising for semimetals. Due to the lack of deep enough energy gap, this optical emission cannot be associated with interband transitions, as it is usually assumed in a thermally stimulated luminescence model. We suppose that the reported accumulated luminescence is the result of thermally stimulated relaxation of some kind of defects created in graphene structures by ionising radiation and therefore we offer to name it the relaxoluminescence. We anticipate the relaxoluminescence to be a starting point for developing a new spectroscopic method for nanotechnology. It can also throw a new light on the nature of defects, which are suspected of being responsible for strange magnetic effects in carbon.
Źródło:
Acta Physica Polonica A; 2006, 110, 1; 71-80
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Origin of point defects in β-Ga₂O₃ single crystals doped with Mg²⁺ ions
Autorzy:
Luchechko, A.
Vasyltsiv, V.
Kostyk, L.
Tsvetkova, O.
Powiązania:
https://bibliotekanauki.pl/articles/1052715.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.-y
78.20.-e
72.40.+w
Opis:
Optical absorption and photoconductivity investigations of nominal pure and Mg²⁺ doped β-Ga₂O₃ single crystals have been carried out. Additional bands in the UV (3.6-4.6 eV) and near-IR (0.4-1.2 eV) spectral regions were found in optical absorption and photoconductivity spectra. A correlation between Mg²⁺ doping, annealing in oxygen atmosphere as well as optical absorption and photoconductivity bands were established in gallium oxide. Electronic transitions from shallow traps and F-centers were observed in the IR spectral region (0.4-1.2 eV). Absorption and photoconductivity in the UV region are related to deep acceptor levels created by native defects and impurities.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 811-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Studies of Neodymium and Europium Phosphoro-azo β-Diketonates
Autorzy:
Amirkhanov, V.
Ovchinnikov, V.
Legendziewicz, J.
Graczyk, A.
Hanuza, J.
Macalik, L.
Powiązania:
https://bibliotekanauki.pl/articles/1945685.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.55.Hx
78.20.Dj
Opis:
New complexes of lanthanides (Nd, Eu) with phosphoro-azo derivatives of β-diketones were synthesized. Optical properties of these compounds were investigated and confronted with the structure and single crystal spectra of different types of earlier reported lanthanide phosphoro-azo-β-diketonates. The exchange of the N-P-O-Me ligand group by the N-P-NR$\text{}_{2}$ one plays only a minor role in binding character of lanthanide ions but strongly affects biological functions and properties of lanthanide systems. In vitro experiment on cytotoxicity of the samples was performed using 10T$\text{}_{1}\text{}_{/}\text{}_{2}$ , L$\text{}_{1}$, MCF, DETA and Meω-132 cell lines.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 455-460
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical Effects on the K$\text{}_{β}$/K$\text{}_{α}$ Intensity Ratios in First-Row Transition Element Compounds
Autorzy:
Küçükönder, A.
Büyükkasap, E.
Yilmaz, R.
Şahin, Y.
Powiązania:
https://bibliotekanauki.pl/articles/1994736.pdf
Data publikacji:
1999-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.-g
82.80.-d
Opis:
Chemical Effects on the K$\text{}_{β}$/K$\text{}_{α}$ X-ray Intensity Ratios for Some First-row Transition Element Compounds Were Studied Experimentally and Calculated. the Vacancies in the K Shell Were Created by 59.5 keV γ rays from an $\text{}^{241}$Am Radioactive Source and Characteristic X-ray Radiation from Sample Was Measured by Using Si(li) and Ge(li) Detectors. the Calculations Were Carried Out Using Brunner's Model. the Calculated Relative K$\text{}_{β}$/K$\text{}_{α}$ X-ray Intensity Ratios Are in Good Agreement with the Present and the Previously Published Experimental Data.
Źródło:
Acta Physica Polonica A; 1999, 95, 2; 243-250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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