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Wyświetlanie 1-15 z 1243
Tytuł:
Electrocaloric Cooling - A New Application of Relaxor Ferroelectrics
Autorzy:
Suchaneck, G.
Gerlach, G.
Powiązania:
https://bibliotekanauki.pl/articles/1031012.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.70.+a
84.60.Bk
77.80.Jk
77.22.Ch
Opis:
Until now, relaxor ferroelectrics are considered as a class of disordered materials possessing peculiar structures and properties which are not yet generalized into a universal model explaining the significant amount of experimental data available. In this work, we demonstrate that one feature of relaxor ferroelectrics - the extraordinary dielectric response - is well-suited for application in electrocaloric refrigerators. We consider the electrocaloric effect with special attention to relaxor ferroelectrics, the dielectric response in the temperature region of interest, the efficiency and the figure of merit of relaxor ferroelectrics for electrocaloric application.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1003-1005
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wormhole Solution and Energy in Teleparallel Theory of Gravity
Autorzy:
Nashed, G. G. L.
Powiązania:
https://bibliotekanauki.pl/articles/2047256.pdf
Data publikacji:
2007-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
04.20.Cv
04.50.+h
04.20.-q
Opis:
An exact solution is obtained in the tetrad theory of gravitation. This solution is characterized by two parameters k$\text{}_{1}$, k$\text{}_{2}$ of spherically symmetric static Lorentzian wormhole which is obtained as a solution of the equation ρ= ρ$\text{}_{t}$=0 with ρ=T$\text{}_{i,j}$u$\text{}^{i}$u$\text{}^{j}$, ρ$\text{}_{t}$ =(T$\text{}_{ij}$-1/2Tg$\text{}_{ij}$) u$\text{}^{i}$u$\text{}^{j}$, where u$\text{}^{i}$u$\text{}_{i}$=-1. From this solution which contains an arbitrary function we can generate the other two solutions obtained before. The associated metric of this space-time is a static Lorentzian wormhole and it includes the Schwarzschild black hole, a family of naked singularity and a disjoint family of Lorentzian wormholes. Calculating the energy content of this tetrad field and using the gravitational energy momentum given by Møller in the teleparallel space-time we find that the resulting form depends on the arbitrary function and does not depend on the two parameters k$\text{}_{1}$ and k$\text{}_{2}$ characterizing the wormhole. Using the regularized expression of the gravitational energy momentum we get the value of energy which does not depend on the arbitrary function.
Źródło:
Acta Physica Polonica A; 2007, 111, 2; 201-213
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of Reissner-Nordström Black Hole
Autorzy:
Nashed, G. G. L.
Powiązania:
https://bibliotekanauki.pl/articles/2047354.pdf
Data publikacji:
2007-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
04.20.Cv
04.50.+h
04.20.-q
Opis:
The singularity of the solutions obtained before in the teleparallel theory of gravitation is studied. Also the stability of these solutions is studied using the equations of geodesic deviation. The condition of stability is obtained. From this condition the stability of the Schwarzschild solution can be obtained.
Źródło:
Acta Physica Polonica A; 2007, 112, 1; 13-21
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:
Irreducible green functions method applied to nanoscopic systems
Autorzy:
Górski, G.
Powiązania:
https://bibliotekanauki.pl/articles/1062052.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Kv
73.23.Hk
74.45.+c
Opis:
The equation of motion method for the Green functions is one of the tools used in the analysis of quantum dot system coupled with the metallic and superconducting leads. We investigate modified equation of motion, based on differentiation of double-time temperature dependent Green functions both over the primary time t and secondary time t'. Our equation of motion approach allows us to obtain the Abrikosov-Suhl resonance in the particle-hole symmetric case and also in the asymmetric cases. We will apply the irreducible Green functions technique to analyses of the equation of motion applied to the dot system. This method gives a workable decoupling scheme breaking the infinite set of the Green function equations. We apply this technique to calculate the density of the states and the differential conductance of single-level quantum dot with the Coulomb repulsion attached to one metallic and one superconducting leads (N-QD-SC). Our results are compared with the previous calculations.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 551-553
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Threshold Effects in Three-Terminal Hybrid Systems
Autorzy:
Michałek, G.
Powiązania:
https://bibliotekanauki.pl/articles/1201870.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.63.Kv
73.63.-b
74.45.+c
Opis:
In the paper we study transport in the three terminal hybrid devices with quantum dot. Our attention is focused on the conductance threshold effects (so called Wigner singularities) caused by the back action from the side-wire. In particular we study influence of the direct electron transfer (ET) and crossed Andreev reflection (CAR) processes on the conductance caused by the direct Andreev reflection (DAR) processes.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 224-225
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Properties of Gabbro Based Glass and Glass-Ceramic Materials
Autorzy:
Bayrak, G.
Powiązania:
https://bibliotekanauki.pl/articles/1293752.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
46.55.+d
64.70.P-
61.43.Fs
61.05.cp
Opis:
Glass-ceramic materials were developed from gabbro including MgO and $Al_2O_3$ additives. Heat treatments for phase transformation from glassy matrix to glass-ceramic were carried out at 1000C for 3 h. X-ray diffraction studies conducted on the glass-ceramic samples revealed that the phases formed in the glass-ceramics were cordierite, anorthite, diopsitic augite, forsterite and andesine. Glass and glass-ceramic materials were tested for wear properties against a harder alumina counterface using by a ball-on-disc tribometer at dry sliding condition. Wear tests were realized under the loads of 2.5, 5, and 7.5 N and at the sliding speeds of 0.1, 0.2, and 0.3 m/s. Wear rate of the glass and glass-ceramics ranged from 7.324 × $10^{-7}$ and 2.150 × $10^{-3}$-9.971 × $10^{-7}$ and 4.982 × $10^{-5} mm^3$/m, respectively. It was shown that the crystallization treatment caused the decrease of wear rate.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 615-617
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametric Study of the Seismic Response of Base Isolated Liquid Storage Tanks with Lead-Core Elastomeric Bearings
Autorzy:
Yazıcı, G.
Powiązania:
https://bibliotekanauki.pl/articles/1182852.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
91.30.Px
05.45.-a
47.11.-j
Opis:
Field reports from past earthquakes indicate that liquid storage tanks are quite susceptible to earthquake related damages due to the sloshing motion of the contained liquid and that the failure of these structures can have catastrophic impacts on the environment in addition to significant financial losses. Recently, the use of seismic response modification strategies such as base isolation and energy dissipation systems have been extended to liquid storage tanks, particularly large liquified natural gas tanks, in order to protect them from the damaging effects of earthquakes. Base isolation involves the installation of horizontally flexible base isolation bearings under the liquid storage tanks to extend the vibration period of the structure and to provide an additional mechanism for energy dissipation. This paper investigates the effects of the variation of mechanical properties of lead-core elastomeric base isolation bearings on the dynamic response of liquid storage tanks through a comprehensive parametric study which was conducted with a script that uses the Matlab state-space solvers. The paper begins by outlining the mechanical analogue system to be used for calculating the overturning moment and the base shear in tank wall as well as the free surface displacements for a cylindrical liquid storage tank subjected to horizontal base excitation. The nonlinear force-displacement characteristics of the bearings are modelled with the Bouc-Wen hysteresis model. Results of the parametric study show that base isolation can be effective at decreasing the base shear and that special attention must be paid to the increases in the sloshing displacements in determining the freeboard height.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 382-384
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault Current Limitation by 2G HTS Superconducting Transformer - Experimental Investigation
Autorzy:
Wojtasiewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/1398591.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.90.+n
84.70.+p
84.71.-b
85.25.-j
85.25.Am
85.25.Qc
Opis:
Transformers represent one of the oldest and most mature elements in a power transmission and distribution network. The new superconducting transformers are smaller and lighter than conventional ones and they have lower power losses, too. Also, the new 2G superconducting tapes with high resistivity in the normal state allow to build transformers with high short-circuit strength. The short-circuit current limiting feature of the superconducting transformer, which is the most important benefit of replacing conventional windings by superconducting ones, provides protection and significantly reduces the wear and tear of circuit breakers and other substation power equipment. This paper describes the design and experimental investigations results of a model of a 1-phase, 8.8 kVA superconducting transformer with windings made of 2G HTS tape. A special regard is given to the ability of the device's superconducting winding to limit the short-circuit current, in particular its equivalent resistance in normal state at a temperature of 77 K (i.e. resistance of the resistive layers of the HTS tape just after transition to the non-superconducting state).
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 516-520
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
All-Weather Microphones - Calibration and Uncertainty Evaluation Methods
Autorzy:
Wszołek, G.
Powiązania:
https://bibliotekanauki.pl/articles/1504434.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.28.-g
43.28.+h
Opis:
The paper presents the problems encountered during calibration of devices equipped with all-weather microphones, which results in frequent omissions in the periodic check-up of monitoring systems. Such a check-up should be regularly carried out, as it would result in broadening and unification of the knowledge concerning the measurements and the evaluation of their uncertainty in the environmental conditions.
Źródło:
Acta Physica Polonica A; 2011, 119, 6A; 1081-1085
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materials Patterning and Characterisation at the Nanometre Scale Using Focused MeV Ion Beams: Present Achievements and Future Prospects
Autorzy:
Grime, G.
Powiązania:
https://bibliotekanauki.pl/articles/1628030.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.Nd
41.75.Ak
41.85.-p
Opis:
A key phenomenon in the interaction of MeV ions and solids is that the energy transferred from the primary ions to the target electrons is high compared with atomic and molecular binding energies, but low compared with the ion energy. This means that there is a high probability of modifying the chemical properties of the material (for patterning) or of inducing the emission of electromagnetic radiation (for analysis), yet the path of particle is changed by a negligible amount, which means that focused beams remain sharp even after penetrating long depths into the material. Developments in focusing MeV ions in recent years have pushed the useable beam diameters into the sub-micrometre region, which means that nuclear microbeams are poised to make an impact in both direct write fabrication and micro-analysis at length scales of interest in nanotechnology or microbiology. This paper reviews the science and technology underlying the use of nuclear microbeams (ion solid interactions, focusing systems) and reports on the present status and trends of applications in sub-micron scale applications.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 467-472
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Alloying of Ti-20Ta-20Nb-(10÷20)Mg Alloys
Autorzy:
Adamek, G.
Powiązania:
https://bibliotekanauki.pl/articles/1374912.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.07.+b
81.40.+z
Opis:
In this paper preparation of new β-Ti alloys using mechanical alloying process has been shown. β -Ti alloys are the best metallic biomaterials because of their excellent properties: biocompatibility, low Young moduli and corrosion resistance. Ti-20Ta-20Nb biocompatible alloy was investigated. Mg was used as alloying element, as well (10, 15 and 20 wt%). Pure Ti, Nb, Ta and Mg powders were alloyed under argon atmosphere in shaker type mill (Spex 8000). There was no problem with cold welding in the mechanical alloying of titanium alloys containing Mg. In the paper a possibility of porous materials preparation by sintering in temperature higher than boiling temperature of Mg has been shown. This thermal dealloying method could be an alternative to space holder technique.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 871-874
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-Resolved X-Ray Diffraction Studies on Biological Systems
Autorzy:
Rapp, G.
Powiązania:
https://bibliotekanauki.pl/articles/1920834.pdf
Data publikacji:
1992-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
87.80.+s
52.50.Jm
Opis:
Understanding of biological function requires knowledge both on structural and dynamical aspects. The aim of time-resolved X-ray diffraction is to combine structural and kinetic methods by monitoring structural or conformational changes within a single protein or assemblies of proteins during their biological action in real time. This requires (i) a powerful X-ray source, (ii) appropriate detectors capable of dealing with high local and total count rates and (iii) a suitable trigger mechanism. These aspects are briefly discussed with emphasis on light as trigger for initiation of structural or conformational changes. Examples are presented on muscle contraction, lipid phase transitions, the photocycle of bacteriorhodopsin and the application of Laue crystallography on the protein p21.
Źródło:
Acta Physica Polonica A; 1992, 82, 1; 103-120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Problems and Unknowns in Positronium Dynamics
Autorzy:
Duplâtre, G.
Powiązania:
https://bibliotekanauki.pl/articles/1812489.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
Opis:
A survey is made on positronium dynamics in liquids. From literature data, it is shown that applying conventional kinetics to positronium reactions leads to quite satisfactory results in a large variety of solvents, solutes, reaction types and temperatures. On the opposite, applying the theoretically well established concepts of positronium bubble state and time-dependent reaction rate coefficient would imply the use of unrealistic solute radii in the related kinetic equations, with possible exception of large solutes (micelles). Some solutes displaying unexpectedly high reaction rate constants are shown to be refractory to any of the above quantitative approaches. The particular case of reversible positronium bound-state formation is further examined, the most consistent results arising, again, from the conventional analysis of the data.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1347-1358
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrabright Synchrotron Radiation Opens up New Research Frontiers
Autorzy:
Margaritondo, G.
Powiązania:
https://bibliotekanauki.pl/articles/1931699.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.+n
79.60.-i
Opis:
We present an update on recent events concerning ultrabright synchrotron radiation. First and foremost, a new generation of sources has been put in operation in the past few months. Second, microscopy and spectromicroscopy - arguably the techniques that will mostly profit from ultrahigh brightness - have produced interesting results demonstrating that they are absolutely needed for a realistic picture of solid surfaces and interfaces, as well as for biological applications. Third, ultrahigh-resolution photoemission has broken new ground in the study of collective phenomena, notably the properties of the superconducting gap. Finally, we will comment on the recent use of another class of sources for practical research: infrared free electron lasers.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 705-712
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1243

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