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    Wyświetlanie 1-7 z 7
    Tytuł:
    HPM Generation by Tri-Anode Coaxial Vircator
    Autorzy:
    Shao, H.
    Liu, G.
    Zhang, Y.
    Yang, Z.
    Sun, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807906.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Gk
    Opis:
    A novel type of coaxial vircator with 3 anodes is proposed. The advantages on high power microwave generation is tested by particle-in-cell simulation and theoretical analysis model is set up as well. The tri-anode coaxial vircator behaves a very stable frequency in the pulse duration. In the tri-anode coaxial vircator, the injecting electron beam is well premodulated in the first anode cavity and forms an inerratic bunch-dispersion mechanism in the second anode cavity; the energy-loss electrons penetrate through the third anode and absorbed by the dumping cavity locates in the centre electrode, which helps keeping the bunch-dispersion cycle undisturbed. A 3.8 GHz tri-anode coaxial vircator is theoretically designed and optimized by particle-in-cell simulation, which gives beam-wave conversion efficiency of over 20% with a stable predominant frequency, in accordance with the particle-in-cell simulation and analytic model.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1047-1049
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Approximate Solutions of Schrödinger Equation under Manning-Rosen Potential in Arbitrary Dimension via SUSYQM
    Autorzy:
    Hassanabadi, H.
    Lu, L.
    Zarrinkamar, S.
    Liu, G.
    Rahimov, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418113.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Ge
    02.30.Gp
    03.65.-w
    34.20.Cf
    Opis:
    The Schrödinger equation under the Manning-Rosen potential is solved in arbitrary dimension via the quantum mechanical idea of supersymmetry. The Pekeris approximation is used to overcome the inconsistency of the potential with the centrifugal term. Comments on the energy eigenvalue behavior versus dimension are included. The inter-dimensional degeneracy for various orbital quantum number l and dimensions D are studied. The expectation values of some physical parameters are reported via the Feynman-Hellmann theorem.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 650-654
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Modulator Topology for Corona Plasma Generation
    Autorzy:
    Ariaans, T.
    Pemen, A.
    Winands, G.
    Liu, Z.
    van Heesch, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807899.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.50.Dg
    52.70.Ds
    52.70.Kz
    52.80.Hc
    82.33.Xj
    96.60.pf
    Opis:
    Gas cleaning using plasma technology is slowly introduced into industry nowadays. Several challenges still have to be overcome: increasing the scale, safety, life-time and reducing costs. In 2006 we demonstrated a 20 kW nanosecond pulsed corona system. The electrical efficiency was > 90%. O-radical yields were found to be very high (3-7 mole/kWh). However, to be competitive, high costs of the pulsed power technology are still a major hurdle. Here we present a novel modulator for efficient generation of large volume corona plasma. Only a small amount of expensive high-voltage components are required. Switching is done at an intermediate voltage level of 1 kV with standard thyristors. At the high-voltage side, only a diode and a pulse transformer are needed. The estimated costs are about 5 kEuro/kW, whereas for state-of-the-art pulsed power technology these costs usually are about 20-30 kEuro/kW. Detailed investigations on the modulator and a wire-plate corona reactor will be presented. Modulator parameters have been varied systematically as well as reactor parameters (number of electrodes, electrode-plate distance). The O-radical yield was determined from the measured ozone concentrations at the exhaust of the reactor. With a detailed kinetic model, ozone concentrations could be calculated back to the initial O*-yields. The following conclusions will be discussed: for all parameters, an electrical efficiency of > 90% could be obtained. With fast imaging, the average streamer width was found to be ∼ 737 μm and an estimate for the plasma volume was made. The obtained yields of O-radicals (1-4 mole/kWh) are excellent. The conditions to obtain high yields will be discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1034-1036
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scanning-Gate Microscopy of Semiconductor Nanostructures: An Overview
    Autorzy:
    Martins, F.
    Hackens, B.
    Sellier, H.
    Liu, P.
    Pala, M. G.
    Baltazar, S.
    Desplanque, L.
    Wallart, X.
    Bayot, V.
    Huant, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047914.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.23.Ad
    03.65.Yz
    85.35.Ds
    Opis:
    This paper presents an overview of scanning-gate microscopy applied to the imaging of electron transport through buried semiconductor nanostructures. After a brief description of the technique and of its possible artifacts, we give a summary of some of its most instructive achievements found in the literature and we present an updated review of our own research. It focuses on the imaging of GaInAs-based quantum rings both in the low magnetic field Aharonov-Bohm regime and in the high-field quantum Hall regime. In all of the given examples, we emphasize how a local-probe approach is able to shed new, or complementary, light on transport phenomena which are usually studied by means of macroscopic conductance measurements.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 569-575
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Epitaxial Fe/(Ga,Mn)As Hybrids
    Autorzy:
    Kalbarczyk, K.
    Dziatkowski, K.
    Szczytko, J.
    Gosk, J.
    Tokarczyk, M.
    Kowalski, G.
    Twardowski, A.
    Bednarski, W.
    Ostrowski, A.
    Waplak, S.
    Martinek, J.
    Liu, X.
    Furdyna, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399140.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.-c
    75.30.Gw
    75.50.Pp
    75.50.Bb
    Opis:
    Thin-film structures composed of two kinds of ferromagnetic material - metallic Fe and semiconducting (Ga,Mn)As - were investigated by means of SQUID magnetometry and ferromagnetic resonance spectroscopy. Dependence of remnant magnetic moment on temperature showed unexpected anisotropic features when recorded along two orthogonal in-plane directions. For one of these orientations, the change in sign of the slope of m(T) curve at the Curie point of (Ga,Mn)As was observed, while for the other, an analogous m(T) curve retained monotonic character. Based on the comparison with ferromagnetic resonance data, the apparent non-monotonicity was attributed to the temperature-induced change of balance between the external magnetic field and uniaxial magnetic anisotropy in the plane of Fe layer.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 873-876
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The INSIDE Project: Innovative Solutions for In-Beam Dosimetry in Hadrontherapy
    Autorzy:
    Marafini, M.
    Attili, A.
    Battistoni, G.
    Belcari, N.
    Bisogni, M.
    Camarlinghi, N.
    Cappucci, F.
    Cecchetti, M.
    Cerello, P.
    Ciciriello, F.
    Cirrone, G.
    Coli, S.
    Corsi, F.
    Cuttone, G.
    De Lucia, E.
    Ferretti, S.
    Faccini, R.
    Fiorina, E.
    Frallicciardi, P.
    Giraudo, G.
    Kostara, E.
    Kraan, A.
    Licciulli, F.
    Liu, B.
    Marino, N.
    Marzocca, C.
    Matarrese, G.
    Morone, C.
    Morrocchi, M.
    Muraro, S.
    Patera, V.
    Pennazio, F.
    Peroni, C.
    Piersanti, L.
    Piliero, M.
    Pirrone, G.
    Rivetti, A.
    Romano, F.
    Rosso, V.
    Sala, P.
    Sarti, A.
    Sciubba, A.
    Sportelli, G.
    Voena, C.
    Wheadon, R.
    Del Guerra, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402609.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.53.Bn
    87.53.Jw
    87.53.Kn
    87.55.N-
    87.55.ne
    87.57.uq
    Opis:
    The INSIDE project addresses the online dose monitoring in particle therapy issue. The proposed detectors exploit the secondary neutral and charged particles emitted during the treatment by the irradiated volumes. The new detection techniques allow to return and online a measurement of the released dose and the Bragg peak position.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1465-1467
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Monitoring Performances with the INSIDE System
    Autorzy:
    Pennazio, F.
    Attili, A.
    Battistoni, G.
    Belcari, N.
    Bisogni, M.
    Camarlinghi, N.
    Cappucci, F.
    Cecchetti, M.
    Cerello, P.
    Ciciriello, F.
    Cirrone, G.
    Coli, S.
    Corsi, F.
    Cuttone, G.
    De Lucia, E.
    Ferretti, S.
    Faccini, R.
    Fiorina, E.
    Frallicciardi, P.
    Giraudo, G.
    Kostara, E.
    Kraan, A.
    Licciulli, F.
    Liu, B.
    Marafini, M.
    Marino, N.
    Marzocca, C.
    Matarrese, G.
    Morone, C.
    Morrocchi, M.
    Muraro, S.
    Patera, V.
    Peroni, C.
    Piersanti, L.
    Piliero, M.
    Pirrone, G.
    Rivetti, A.
    Romano, F.
    Rosso, V.
    Sala, P.
    Sarti, A.
    Sciubba, A.
    Sportelli, G.
    Voena, C.
    Wheadon, R.
    Del Guerra, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402611.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.53.Bn
    87.53.Jw
    87.53.Kn
    87.55.N-
    87.55.ne
    87.57.uq
    Opis:
    The INSIDE collaboration aims to build an on-line hadrontherapy monitoring system, based on a dual-head in-beam PET scanner and a secondary charged particles profiler. In this work preliminary experimental results are presented. The validation of the FLUKA-based Monte Carlo simulation tool is shown together with the expected scanner performances.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1468-1470
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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