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Wyświetlanie 1-15 z 303
Tytuł:
Resonance Tunneling in Ferromagnet-Triplet Superconductors Junctions
Autorzy:
Kowalewski, L.
Wojciechowski, R. J.
Wojtuś, P.
Powiązania:
https://bibliotekanauki.pl/articles/2047330.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Pq
73.40.-c
74.45.+c
Opis:
We discuss the tunneling conductance in a ferromagnet-insulator-triplet superconductor junction. We consider the superconducting order parameters with spin triplet pairing having nodes. The nodal structure of the order parameter has been recently confirmed experimentally in Sr$\text{}_{2}$RuO$\text{}_{4}$. In particular, we study how a mid-gap structure of the tunnelling conductance depends on the phase difference of the pairing potential as well as on the orientation of the interface.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 683-691
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Principles Creation Integrated On-Line Access System for Free Standing Renewable Energy Technology (RET)
Autorzy:
Kisseleva, O.
Akhmetov, B.
Kharitonov, P.
Powiązania:
https://bibliotekanauki.pl/articles/1402006.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.70.+C
Opis:
This paper presents the development of the structure of the integrated ON-LINE information system for collective use of renewable energy. Information about each installation including its location identification and capacity which is potentially available for external users is accessible via internet. Structure of each installation will include an intellectual control and registration module (ICRM) for electric energy available to external users. Where necessary any consumer can request reserve energy generated in near-by located free standing istallations for external use and make a decision to approach to any of those installation.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-258-B-259
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MIS-Microstructure with Periodic Field Electrodes. A New Type of Dynamic Superlattice
Autorzy:
Trale, I. E.
Powiązania:
https://bibliotekanauki.pl/articles/1887577.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.-c
Opis:
The electron movement in thin semiconductor layer adjoining interface semiconductor-insulator in metal-insulator-semiconductor (MIS) microstructure with periodic field electrodes is considered. If a voltage of some sufficiently high frequency is applied to such a structure the effect of this high frequency field on a charge carriers in semiconductor is equivalent, in a sense, to the effect of some time-independent effective potential which is a sequence of deep "dynamic" quantum wells, where the charge carriers are localized. It is shown that the electron resonant tunneling may occur in this structure.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 699-705
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sonolysis and Sonoacidification οf Ultrasonic Disintegration οf Excess Sludge
Autorzy:
Zielewicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/1811568.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.-c
Opis:
The expected effect of ultrasonic disintegration of excess sludge is particle dispergation and cell lysis i.e. the elimination of sludge microorganisms and the release of the contents of dead cells into the sludge liquid which results in an increase in chemical oxygen demand. Sonolysis also formed the basis for the intensification of volatile fatty acids production during the acid fermentation of excess sludge treated ultrasonically. In this study the investigations into the direct effects of excess sludge ultrasonic treatment revealed an increase in volatile fatty acid concentration directly (without fermentation process) after the ultrasonic treatment which is closely related to sonolysis.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-259-A-264
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Myofascial Trigger Points and the Body Posture - Deactivating them Applying Magnetic Fields (preliminary reports)
Autorzy:
Jutrzenka-Jesion, J.
Chochowska, M.
Hojan-Jezierska, D.
Powiązania:
https://bibliotekanauki.pl/articles/1196924.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.50.C-
Opis:
Myofascial pain syndrome is sensory, motor, autonomic disorder caused by the occurrence of trigger points (TrP). In literature the possibilities of deactivating TrPs through exposure to magnetic field (MF) can be noticed. The aim of current research is an attempt at answering the question whether MF changes TrP activity. Tests were carried out on 22 volunteers, who were divided into three groups. First was exposed to static MF using MagneticUnit discs, second was exposed to slow changing MF using Viofor-JPS. The third was exposed to magnetoledotherapy, also using Viofor-JPS.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-16-A-19
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tolerance Analysis with Multiple Surrogate Models
Autorzy:
Bayram, U.
Acar, E.
Powiązania:
https://bibliotekanauki.pl/articles/1402505.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.-c
Opis:
Design and analysis of modern engineering systems are complicated, mostly relying on computational analyses codes and hence often computationally expensive. Meanwhile, improved computer-aided design and numerical simulation methods are used extensively in the design process. Even continuing growth of computing power and speed, computationally cheap and reliable models or simulation techniques are not available, at least as ready-to-use computer analysis codes. The necessity of tolerance analysis takes important place at the same time with improved CAD and computer based process planning, because of high quality production requirements, and reduces manufacturing costs. Simulation based design and optimization becomes the only option to meet the specifications, and improves the system reliability. In the last few decades, the use of surrogate models has achieved significant advantages, because they provide fast computation and design investigation as they replace computationally expensive to run computer analyses with cheap to run approximations. Surrogate models also simplify the integration of analyses codes to optimization and reliability assessment studies. In this paper, response surface and Kriging surrogate models are used within a Monte Carlo simulation framework for tolerance analysis. As an illustrative example problem, tolerance analyses of a clutch assembly with nonlinear objection function are used. The effects of the surrogate model parameters (e.g., the use of different regression polynomials) and the number of training points on tolerance analysis are explored.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-447-B-449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear Zeeman Splitting of Holes in Doped GaAs Heterostructures
Autorzy:
Kubisa, M.
Ryczko, K.
Jadczak, J.
Bryja, L.
Misiewicz, J.
Potemski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047934.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.-c
Opis:
Polarization-resolved photoluminescence from two-dimensional GaAs/GaAlAs heterostructures doped with acceptors was studied in high magnetic fields. Measurements were carried out in low temperatures up to 2 K and magnetic field up to 21 T. Experiments performed in the Faraday configuration enabled to resolve hole states with different spin orientation. We observed a nonlinear behavior of valence-band g factor in strong magnetic fields. To explain obtained results, a detailed theoretical calculation was carried out based on the Luttinger model for valence-band states. We examined the spin splitting of hole levels under the influence of both external magnetic field and built-in electric field existing in doped heterostructures. Changes of hole g factor with the width of the structure and the density of two-dimensional carriers are discussed.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 609-611
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Resonance Imaging Analysis of Moving Fronts in Floating Dosage Forms
Autorzy:
Kulinowski, P.
Dorożyński, P.
Jachowicz, R.
Jasiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/2043429.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.61.-c
Opis:
An application of magnetic resonance imaging in the field of pharmaceutical technology is presented in this paper. The analysis of diffusion and swelling fronts was carried out for four floating dosage forms using magnetic resonance imaging. The influence of polymer viscosity, its concentration, and type of applied dissolution media on the area of moving fronts was investigated.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 155-160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer Studies of Core-Shell Nanoparticles.
Autorzy:
Kalska-Szostko, B.
Cydzik, M.
Satuła, D.
Giersig, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506313.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.80.Ej
81.07.-b
75.75.-c
81.16.-c
Opis:
The ferrite magnetic nanoparticles with core-shell structures were obtained in two step preparation process. The Mössbauer spectra obtained for particles of pure maghemite or magnetite and two layered core-shell one the magnetite on maghemite and maghemite on magnetite are very different from each other. The presented results show that interparticle and intraparticle interaction plays important role in overall magnetic properties as well.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 15-17
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Closed-Loop INS/TACAN/ALT Positioning System
Autorzy:
Kaniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1811554.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.70.-c
07.05.Tp
07.57.-c
89.40.Dd
Opis:
The paper presents a design of aircraft integrated positioning system, composed of INS, TACAN and altimeter (ALT). This paper describes a modified, closed-loop version of INS/TACAN/ALT system and compares it to the previous design. The system is integrated according to the scheme of compensation with feed-backward INS correction and it employs a complementary extended Kalman filter. The paper includes chosen results of simulations obtained for the open-loop and closed-loop INS/TACAN/ALT systems and discusses advantages of the new design.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-133-A-138
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Magnetically Guided Slow Positron Beam for Defect Studies
Autorzy:
Anwand, W.
Kissener, H.
Brauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/1933460.pdf
Data publikacji:
1995-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
06.90.+v
07.90.+c
Opis:
The design and construction of a compact, magnetically guided slow positron beam is discussed. The system uses a 30 mCi $\text{}^{22}$Νa source. It consists of three main parts: (i) the source chamber with a tungsten foil transmission moderator and the extraction optics, (ii) the beam line with magnetic beam guidance, a bent tube for the separation of the fast positrons and the accelerator stage, (iii) the target chamber with the sample holder and the detector electronics. The energy of the incident positrons can be varied from 30 eV up to 50 keV. Furthermore source geometries, pre-acceleration, main acceleration sections and various magnetic induction profiles have been considered, such as (i) rectangular, conical and bent Wehnelt electrodes, (iii) pre-accelerator voltage shared over several electrodes, (iii) weak, strong, constant and z-dependent B-profiles, (iv) geometric options in the main accelerator region, (v) purely electrostatic and combined electric/magnetic fields. The beam is mainly designed for defect profile studies in ultra high vacuum conditions.
Źródło:
Acta Physica Polonica A; 1995, 88, 1; 7-11
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiparty d-Dimensional Quantum Information Splitting
Autorzy:
Grudka, A.
Wójcik, A.
Powiązania:
https://bibliotekanauki.pl/articles/2035617.pdf
Data publikacji:
2002-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.67.-a
89.70.+c
Opis:
Generalization of quantum information splitting protocol from qubits to qudits (quantum d-dimensional systems) is presented.
Źródło:
Acta Physica Polonica A; 2002, 102, 6; 703-707
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Representation of Total Cross-Sections for Electron Atom Scattering: Application to Atomic Helium
Autorzy:
Mansouri, A.
Houamer, S.
Moulay, M.
Powiązania:
https://bibliotekanauki.pl/articles/2036874.pdf
Data publikacji:
2003-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.-p
02.70.-c
Opis:
Based on the series expansion formalism, an analytical approach is proposed to evaluate the total cross-sections induced by electron impact excitation. As an illustration, an analytical expression of the total cross-section of the double excitation of helium atom by electron impact is obtained for the 2p$\text{}^{2}$ $\text{}^{3}$P and 2p3p $\text{}^{1}$P transitions within the framework of the distorted wave Born approximation. The available experimental data are well reproduced by the obtained expression of the total cross-section which is function of the only parameter of the incident electron energy. Comparisons are also made with numerical calculations.
Źródło:
Acta Physica Polonica A; 2003, 104, 1; 25-34
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Localised to Ballistic Excitons in GaAs Quantum Wells
Autorzy:
Pulizzi, F.
Christianen, P. C. M.
Maan, J. C.
Eshlaghi, S.
Reuter, D.
Wieck, A. D.
Powiązania:
https://bibliotekanauki.pl/articles/2028827.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.36.+c
Opis:
The lateral motion of excitons in GaAs quantum wells is studied by means of spatially resolved photoluminescence. We show that at low temperatures (4.2 K) the exciton motion evolves from localised excitons (zero mobility) in thin quantum wells to extremely high mobilities in wide wells. We find that for the widest quantum well investigated the observed motion cannot be explained by simple exciton diffusion and must be explained by the propagation of ballistic exciton polaritons.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 397-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Electrons in Quantum Chaos State in Doped Fullerene Crystal
Autorzy:
Koper, A.
Mucha, M.
Powiązania:
https://bibliotekanauki.pl/articles/2012904.pdf
Data publikacji:
2000-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.+b
61.48.+c
Opis:
We show that band electrons in A$\text{}_{n}$C$\text{}_{60}$ crystal (C$\text{}_{60}$ fullerene doped with alkali ions A) are in highly chaotic quantum state. We describe intensity of the chaos by means of the Shannon information entropy, which we calculate using single particle Bloch functions. The entropy provides a quantitative measure of scars as well as degree of electrons delocalization in gaps between C$\text{}_{60}$ molecules. Implications of our results for conductivity in A$\text{}_{3}$C$\text{}_{60}$ are discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 1; 229-232
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 303

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