Zobrazeno 1 - 10 of 48 pro vyhledávání: '"T. E. Lamas"'
1
On the lack of correlation between PD readings and failure location in high-voltage stator bars
Autor: C. S. Goncalves, T. K. Aoki, Egidio Jose Faria, M. J. da Silva, T. E. Lamas, Thomas Hildinger, Francisca M. Pereira, Joao Fiorini Cordeiro
Publikováno v: 2017 IEEE Electrical Insulation Conference (EIC).
After showing in a previous work that PD measurements suffer from poor repeatability and reproducibility, the present study turns now to a more qualitative approach, investigating if a method of PD fault location along a Roebel bar length can be used
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c086142d98e56b4fbe39b17cfd64959c
https://doi.org/10.1109/eic.2017.8004610
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2
On the variability of PD results among expert independent laboratories
Autor: T. K. Aoki, Francisca M. Pereira, Thomas Hildinger, C. S. Goncalves, Joao Fiorini Cordeiro, Egidio Jose Faria, T. E. Lamas, M. J. da Silva
Publikováno v: 2016 IEEE Electrical Insulation Conference (EIC).
In spite of the fact that no evidence exist that PD amplitudes can somehow be used to estimate the expected “life” of generator components such as Roebel stator bars and multi-turn coils, certain portions of industry have assumed that pass-fail c
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f36540317f4957b637fb497aac4c7a6
https://doi.org/10.1109/eic.2016.7548694
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3
Exciton behavior in GaAs/AlGaAs coupled double quantum wells with interface disorder
Autor: José Leonil Duarte, E. M. Lopes, L. C. Poças, Edson Laureto, Ivan Frederico Lupiano Dias, A. A. Quivy, T. E. Lamas
Publikováno v: Journal of Luminescence. 130:460-465
In this work, we present a detailed study on the optical properties of two GaAs/Al 0.35 Ga 0.65 As coupled double quantum wells (CDQWs) with inter-well barriers of different thicknesses, by using photoluminescence (PL) spectroscopy. The two CDQWs wer
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::166e9d50890b4cbac3888bdf8a80af5a
https://doi.org/10.1016/j.jlumin.2009.10.013
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4
VALLEY SPLITTING AND g-FACTOR IN AlAs QUANTUM WELLS
Autor: G. M. Gusev, Celso de Araujo Duarte, J. C. Portal, A. K. Bakarov, T. E. Lamas
Publikováno v: International Journal of Modern Physics B. 23:2948-2954
Here we present the results of magneto resistance measurements in tilted magnetic field and compare them with calculations. The comparison between calculated and measured spectra for the case of perpendicular fields enable us to estimate the dependen
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf4d505f6e970884496ff5f3f5823fd9
https://doi.org/10.1142/s0217979209062608
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5
QUANTUM HALL FERROMAGNET IN A DOUBLE WELL WITH VANISHING g-FACTOR
Autor: J. C. Portal, L. E. G. Armas, G. M. Gusev, A. K. Bakarov, T. E. Lamas
Publikováno v: International Journal of Modern Physics B. 23:2933-2937
We have studied the quantum Hall effect in Al x Ga 1-x As -double well structure with vanishing g-factor. We determined the density-magnetic field ns - B diagrams for the longitudinal resistance Rxx. In spite of the fact that the ns - B diagram for c
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::17b7223956ebf3c66837136eb0e2cab5
https://doi.org/10.1142/s0217979209062578
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6
MAGNETORESISTANCE OSCILLATIONS IN DOUBLE QUANTUM WELLS UNDER MICROWAVE IRRADIATION
Autor: O. E. Raichev, A. K. Bakarov, T. E. Lamas, Steffen Wiedmann, G. M. Gusev, J. C. Portal
Publikováno v: International Journal of Modern Physics B. 23:2943-2947
We report in detail oscillatory magnetoresistance in double quantum wells under microwave irradiation. The experimental investigation contains measurements of frequency, power and temperature dependence. In theory, the observed interference oscillati
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2b67e7cfe1a779ef61223f593d112ab3
https://doi.org/10.1142/s0217979209062591
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7
Synchrotron X-ray Renninger scanning for studying strain in InAs/GaAs quantum dot system
Autor: Raul O. Freitas, T. E. Lamas, A. A. Quivy, Sérgio L. Morelhão
Publikováno v: physica status solidi (a). 204:2548-2554
A systematic procedure for ultra-precise lattice parameter determination using X-ray Renninger scanning (XRS) is optimized and applied to probe the average in-plane strain in series of samples representing the different stages of the growth process o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bfb7972e6967084956f8f4ecdaa6e8ed
https://doi.org/10.1002/pssa.200675673
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8
HALL RESISTANCE AND MANY-BODY EFFECTS IN A PARABOLIC WELL
Autor: T. E. Lamas, A. A. Quivy, Niko Churata Mamani, J. C. Portal, G. M. Gusev, A. M. Ortiz de Zevallos
Publikováno v: International Journal of Modern Physics B. 21:1502-1506
We report on Hall effect measurements in 1000-4000 Åwide AlxGax-1As parabolic wells with quasi-two-dimensional electrons and holes in the presence of a perpendicular magnetic field. Above a critical magnetic field B > 3T, the Hall resistance is foun
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9ea99a3efad5cb71f0495d634d5d9076
https://doi.org/10.1142/s0217979207043099
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9
Evaluation of Roebel bars aged under service conditions in large hydrogenerators
Autor: M. J. da Silva, Francisca M. Pereira, Thomas Hildinger, T. K. Aoki, Joao Fiorini Cordeiro, C. S. Goncalves, Egidio Jose Faria, T. E. Lamas
Publikováno v: 2015 IEEE Electrical Insulation Conference (EIC).
The evaluation of high-voltage groundwall insulation aged under long-term operating conditions is addressed using three sets of Roebel bars removed from large hydrogenerators after several decades of service. To cover an important cross-section of th
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::173970ad8ead69701f62fad95ee48c54
https://doi.org/10.1109/icacact.2014.7223617
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10
Spin valve effect and hall resistance in a wide parabolic well
Autor: T. E. Lamas, Celso de Araujo Duarte, G. M. Gusev, A. A. Quivy
Publikováno v: Brazilian Journal of Physics v.36 n.2a 2006
Brazilian Journal of Physics
Sociedade Brasileira de Física (SBF)
instacron:SBF
Brazilian Journal of Physics, Volume: 36, Issue: 2a, Pages: 488-491, Published: JUN 2006
We report observation of the Hall slope change in wide Al cGa1-cAs parabolic wells in the presence of a quasi-parallel magnetic field. Above the critical magnetic field B > 4T, the Hall resistance becomes temperature dependent and can be described by
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2585e5ddc21644ab4738083021a7384c
https://doi.org/10.1590/s0103-97332006000300068
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