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Wyświetlanie 1-15 z 406
Tytuł:
On the Mechanism of Excitation Energy Transfer Involving Long and Short Range Interaction in Dilute Organic Liquid Scintillator Systems
Autorzy:
Hanagodimath, S. M.
Gadaginamath, G. S.
Chikikur, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/1920488.pdf
Data publikacji:
1992-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
34.30.+h
Opis:
The rate parameter K$\text{}_{3}$ of solvent-solute energy transfer and the rate parameter K$\text{}_{7b}$ for solvent-quencher energy transfer are determined experimentally under ultraviolet excitation for a system Ethyl 1 butyl-2-methyl-5 ethoxycarboxy methoxy indole-3-carboxylate (EBMEC) in a deoxygenated system comprising 1:9 mixture of toluene-cyclohexane as a function of temperature in the range of 20-70°C, using bromobenzene as a solvent quencher. The data is analysed in terms of compact equation formed by combining Voltz et al. and Birks and Conte models. The interaction distance for the energy transfer from the excited solvent to solute molecules and solvent to quencher molecules are determined using this equation. The magnitude of the interaction distance indicates that the excitation energy transfer takes place due to long-range interaction in the case of solvent-solute energy transfer and short-range interaction in the case of solvent quencher energy transfer in dilute systems.
Źródło:
Acta Physica Polonica A; 1992, 81, 3; 361-368
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signatures of p-Shell Electron g-Factor in s-Shell Emission of CdTe/ZnTe Quantum Dots
Autorzy:
Kazimierczuk, T.
Goryca, M.
Wojnar, P.
Golnik, A.
Nawrocki, M.
Kossacki, P.
Powiązania:
https://bibliotekanauki.pl/articles/1492860.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.67.Hc
Opis:
We analyze the photoluminescence of excitonic complexes containing p-shell electron in the magnetic field in the Faraday configuration. We demonstrate that despite the p-shell electron is not involved directly in the recombination process, its g-factor influences the emission spectrum. We found that in the case of CdTe/ZnTe quantum dots the p-shell electron is significantly less affected by the magnetic field than s-shell electron in the same dot.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 874-876
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Noise Characteristics of Nonlinear Optical Amplifiers
Autorzy:
Boyd, R. W.
Agarwal, G. S.
Davis, W. V.
Gaeta, A. L.
Nagasako, E. M.
Kauranen, M.
Powiązania:
https://bibliotekanauki.pl/articles/1931479.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.-k
42.50.Lc
Opis:
Quantum mechanical arguments show that any optical amplifier must add noise to the amplified beam of light. For the case of a high gain amplifier with a coherent (Poissonian) input, the signal-to-noise ratio of the amplified beam must be at least two times smaller than that of the incident beam. We review the theoretical basis of this prediction. We also describe the results of our experimental investigations of the noise properties of optical amplifiers that utilize the nonlinear optical response of strongly driven atomic transitions.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 117-126
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precise Measurements of the Hyperfine Structure of the Levels Belonging to the Terms $3d^{5}4s$ $\text{}^{5}G$ and $\text{}^{5}P$ in $Cr(I)$
Autorzy:
Krzykowski, A.
Głowacki, P.
Jarosz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1419711.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.10.Fn
Opis:
The hyperfine structure intervals for the electronic levels belonging to the terms $3 d^5 (\text{}^4G) 4s a^5G$ and $a^5P$ of a chromium 53 atom were precisely measured with the use of the method of atomic beam magnetic resonance detected by laser induced resonance fluorescence. Magnetic-dipole and electric-quadrupole hyperfine interaction constants (A and B, respectively) for the electronic levels of interest were determined with the accuracy of a few kHz. The high precision of measurements also enabled an estimation of the octupole-coupling constants (C).
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 78-81
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hopping Conduction Mechanism in Amorphous CuO-Bi$\text{}_{2}$O$\text{}_{3}$ Pellets
Autorzy:
Motke, S. G.
Burghate, D. K.
Gawande, W. J.
Pakade, S. V.
Yawale, S. P.
Powiązania:
https://bibliotekanauki.pl/articles/1931822.pdf
Data publikacji:
1994-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ng
72.90.+y
Opis:
The transport properties of CuO-Bi$\text{}_{2}$O$\text{}_{3}$ pellets (pressed at room temperature 303 K) like dc electrical conductivity etc. are measured. The activation energy, dielectric constant etc. are reported. The hopping conduction is examined. Non-adiabatic hopping conduction is observed. The plot of -log σ versus 1/T is found to be linear. Activation energy of pellets containing CuO (80, 70, 60 mol%) shows electronic conduction while the pellet containing CuO (50 mol%) shows ionic conduction. The effect of content of CuO (mol%) and frequency on dielectric constant is also studied. The variation of dielectric constant with CuO (mol%) shows zigzag nature and may be due to the relaxation effects.
Źródło:
Acta Physica Polonica A; 1994, 86, 6; 969-978
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Electronic Properties of GdNi$\text{}_{5-x}$Al$\text{}_{x}$ Intermetallic Compounds
Autorzy:
Coldea, M.
Chiuzbaian, S. G.
Neumann, M.
Todoran, D.
Demeter, M.
Tetean, R.
Pop, V.
Powiązania:
https://bibliotekanauki.pl/articles/2014461.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Pv
71.20.Lp
Opis:
X-ray photoelectron spectroscopy and magnetic susceptibility of GdNi$\text{}_{5}$, GdNi$\text{}_{4}$Al, GdNi$\text{}_{2}$Al$\text{}_{3}$ and GdNiAl$\text{}_{4}$ are reported. The magnetic state of Ni 3d-electrons strongly depends on the crystallographic structure of the compounds, showing spin fluctuations in GdNi$\text{}_{5}$ and GdNi$\text{}_{4}$Al, a similar behavior with that of metallic Ni in GdNi$\text{}_{2}$Al$\text{}_{3}$ and a filled 3d-band in GdNiAl$\text{}_{4}$.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 629-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thin Films Investigations by Means of Spin-Wave Resonance
Autorzy:
Maksymowicz, A. Z.
Maksymowicz, L. J.
Whiting, J. S. S.
Powiązania:
https://bibliotekanauki.pl/articles/1891792.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.50.+g
76.30.-v
73.90.+f
Opis:
Magnetic resonance technique may successfully be applied to determine some basic parameters such as g-factor, magnetization M$\text{}_{s}$ or anisotropy energy constant K$\text{}_{u}$ in thin magnetic films. These parameters are obtained from a ferromagnetic resonance experiment when uniform precession of M$\text{}_{s}$ takes place. From spin-wave resonance one may extract very valuable information on the exchange constant A or the surface conditions characterized by the surface anisotropy energy (or pinning parameters ρ). In fact, it is only spin-wave resonance or similar techniques which allow for measurements of A, ρ or the coupling constant K$\text{}_{c}$ between ferromagnetic sublayers in multi-layered structure. The magnetic phase diagram, temperature dependence of the spin-waves stiffness constant, and the anisotropy energy constant may also be listed as less common examples of spin-wave resonance technique application for the investigation of thin films. This paper presents a theoretical approach to typical examples of experimental results and their interpretation from spin-wave resonance measurements.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 665-673
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Data Evaluation for ²¹⁷Th
Autorzy:
Nafee, S.
Al-Ramady, A.
Shaheen, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398746.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
21.10.-k
23.20.-g
23.35.+g
29.30.-h
Opis:
Thorium-217 was produced by the reaction ¹⁷⁰Er (⁵⁰Ti, xn) ^{220-x}Th. The nuclei were studied by Evaporation Residues gamma-alpha-gamma coincidence measurements (ER-γ-α-γ). The evaluated decay data for the ²¹⁷Th nuclide resulted from the above interaction is presented in this report. Three delayed γ-transitions (309, 673 and 1269 keV) have been measured from the ER-γ(-γ)-α correlations and γ-γ coincidences. They were assigned to ²¹⁷Th, based on the level systematics of the N=127 isotones. The evaluated half-lives T_{1/2} for these levels were assigned to be 64-₂₂⁺⁶⁴, 69-₁₇⁺³² and 66-₁₅⁺²⁷ μs, respectively. In addition, an isomeric state (2252+x) keV is presented in the ²¹⁷Th decay scheme between the 2252 (21/2+) and 2362 (25/2+) keV. Q (α) has been updated based on the recent published work of the Atomic Mass Evaluation AME2012 as well. Moreover, the total conversion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell conversion electron ratios have been calculated using BrIcc code v2.3.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 669-672
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porosity of Low-κ Materials Studied by Slow Positron Beam
Autorzy:
Brusa, R. S.
Macchi, C.
Mariazzi, S.
Karwasz, G. P.
Powiązania:
https://bibliotekanauki.pl/articles/2042213.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.60.+z
78.70.Bj
68.60.Dv
68.90.+g
Opis:
The information about porosity in low-κ materials obtainable by depth profiling with positron annihilation spectroscopy is reviewed. In particular we focus on Doppler broadening spectroscopy and 2-3γ ratio of positronium measurements on SiOCH and amorphous carbon a-C:F:H thin films produced by plasma enhanced chemical vapour deposition.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 702-711
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Weak Localization and Electron-Electron Interaction in Si/SiGe Quantum Wells
Autorzy:
Prinz, A.
Stőger, G.
Brunthaler, G.
Bauer, G.
Ismail, K.
Meyerson, B. S.
Powiązania:
https://bibliotekanauki.pl/articles/1933957.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Fz
Opis:
A negative magnetoresistance is observed in Si/SiGe modulation doped heterostructures which is attributed to the single particle quantum interference (weak localization) effect. From analysis of the experimental data the electron phase coherence time τ$\text{}_{ϕ}$ is extracted to follow a (aT + bT$\text{}^{2}$ )$\text{}^{-1}$ dependence. The evaluated prefactor α = 0.25 is below the theoretical limit of 0.5, but agrees with observations in Si and GaAs/AlGaAs heterostructures.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 873-876
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conductance Fluctuations in PbSe: Manifestation of Ballistic Transport in Macroscale?
Autorzy:
Grabecki, G.
Takeyama, S.
Adachi, S.
Takagi, Y.
Dietl, T.
Kamińska, E.
Piotrowska, A.
Papis, E.
Frank, N.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1933748.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Jv
Opis:
Precise magnetoresistance measurements on microstructures of photolithographically patterned PbSe epilayers have been performed in the magnetic field range up to 17 Τ. Unusually large, reproducible magnetoconductance fluctuations have been observed. The fluctuation amplitude decreases exponentially with the magnetic field. A correlation magnetic field of the fluctuations corresponds to the Aharonov-Bohm effect which involves electron trajectories much smaller than the electron mean free path. This points strongly to the ballistic, not diffusive, origin of the observed phenomenon.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 727-730
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Exact Solutions for Boussinesq Type Equations by Using (G'/G, 1/G) and (1/G')-Expansion Methods
Autorzy:
Demiray, S.
Ünsal, Ö.
Bekir, A.
Powiązania:
https://bibliotekanauki.pl/articles/1198520.pdf
Data publikacji:
2014-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.30.Jr
02.70.Wz
05.45.Yv
94.05.Fg
Opis:
In this paper, the (G'/G, 1/G) and (1/G')-expansion methods with the aid of Maple are used to obtain new exact traveling wave solutions of the Boussinesq equation and the system of variant Boussinesq equations. The travelling wave solutions are expressed by the hyperbolic functions, the trigonometric functions, and the rational functions. It is shown that the proposed method provides a powerful mathematical tool for solving nonlinear wave equations in mathematical physics and engineering.
Źródło:
Acta Physica Polonica A; 2014, 125, 5; 1093-1098
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of the Belief Propagation for the Ising Model
Autorzy:
Siudem, G.
Świątek, G.
Powiązania:
https://bibliotekanauki.pl/articles/1388282.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.10.-a
05.45.-a
89.65.-s
Opis:
The Belief Propagation algorithm is a popular technique of solving inference problems for different graph-like structures. We present a discussion of the dynamics of that algorithm for the Ising model on the square lattice. Our main goal was to describe limit fixed points for that algorithm, which are strictly connected with the marginal probabilities and stationary points of the Bethe Free Energy. Analytical considerations provide an exact analysis of a class of symmetrical points while numerical simulations confirm that for small lattices there are no non-symmetrical points. Notwithstanding the prevalent use of the Belief Propagation as an inference tool we present a sociophysical interpretation of its dynamics. In that case our considerations may be viewed as an investigation of the possible fixed points of the social dynamics.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-145-A-149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small Angle X-Rays Scattering Studies of Biomolecules
Autorzy:
Funari, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/2030570.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
87.80.-y
64.75.+g
Opis:
The building units of biological systems, the biomolecules, cannot easily be organized or even classified into defined categories. They can be as simple as water or complex as tintin, a muscle protein extremely large with several thousand atoms. To understand their function, one must know their characteristics, where they occur and what they do. One approach to reach such an ambitious task is to determine their structure, as single molecules or assembled into aggregates. Small angle X-ray scattering is the most important method for this purpose. We present studies carried out on several systems, and aiming at different questions about them. We start with lipids, the main components of the cell membranes. These membranes form the cell boundaries, the moiety required for the so-called membrane proteins, but also influence significantly several aspects of biological activity. More complex systems like a muscle fibre is also presented, showing that changes in the structure are related to the movement mechanism. It becomes easy to conclude that knowing the structures and the changes occurring in them is an important way to understand the function of biomolecules and therefore their role in the life cycle.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 647-658
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Conductivity of Cobalt Phthalocyanine
Autorzy:
Abdel-Malik, T. G.
Kassem, M. E.
Aly, N. S.
Khalil, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/1920784.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.40.+i
Opis:
The dielectric properties of cobalt phthalocyanine are investigated in the frequency range 50-5×10$\text{}^{5}$ Hz and within the temperature range 293-363 K. The frequency dependence of the AC impedance could be expressed by the complex plane of the complex impedance. Analysis of the AC conductivity reveals semiconducting features based predominantly on the hopping mechanism. The relaxation time, derived from the experimental results, shows a thermally activated process.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 675-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 406

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