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Letteratura scientifica selezionata sul tema "Zeehan Current"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 4 febbraio 2022

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Articoli di riviste sul tema "Zeehan Current"

Radkhah, Ali Reza, e Soheil Eagderi. "Study on biological and ecological characteristics of mudskippers". Journal of Threatened Taxa 11, n. 7 (26 maggio 2019): 13948–50. http://dx.doi.org/10.11609/jott.4984.11.7.13948-13950.

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Due to the ecological importance of mudskippers, it is necessary to provide a comprehensive reference about these fishes. Therefore, the present work aims to introduce the current book entitled " Fishes out of Water: Biology and Ecology of Mudskippers " edited by Zeehan Jaafar and Edward O. Murdy. This book contains 15 chapters published by CRC press in 2017. Because of its valuable content, this book has become a complete reference about mudskippers. This valid reference will be useful for a wide range of students, researchers and specialists in the fields of evolution, environment, fish behavior and physiology.

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TAGANI, M. BAGHERI, e H. RAHIMPOUR SOLEIMANI. "SPIN-DEPENDENT BEATS CREATED BY IRRADIATION OF MICROWAVE FIELD THROUGH A QUANTUM DOT". Modern Physics Letters B 25, n. 25 (10 ottobre 2011): 2033–39. http://dx.doi.org/10.1142/s0217984911027224.

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We study spin-dependent transport through a quantum dot with Zeeman split levels coupled to ferromagnetic leads and under influence of microwave irradiation. Current polarization, spin current, spin accumulation and tunneling magnetoresistance are analyzed using nonequilibrium Green's function formalism and rate equations. Spin-dependent beats in spin resolved currents are observed. The effects of magnetic field, temperature and Coulomb interaction on these beats are studied.

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Kudisch, Bryan, Margherita Maiuri, Luca Moretti, Maria B. Oviedo, Leon Wang, Daniel G. Oblinsky, Robert K. Prud’homme, Bryan M. Wong, Stephen A. McGill e Gregory D. Scholes. "Ring currents modulate optoelectronic properties of aromatic chromophores at 25 T". Proceedings of the National Academy of Sciences 117, n. 21 (8 maggio 2020): 11289–98. http://dx.doi.org/10.1073/pnas.1918148117.

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The properties of organic molecules can be influenced by magnetic fields, and these magnetic field effects are diverse. They range from inducing nuclear Zeeman splitting for structural determination in NMR spectroscopy to polaron Zeeman splitting organic spintronics and organic magnetoresistance. A pervasive magnetic field effect on an aromatic molecule is the aromatic ring current, which can be thought of as an induction of a circular current of π-electrons upon the application of a magnetic field perpendicular to the π-system of the molecule. While in NMR spectroscopy the effects of ring currents on the chemical shifts of nearby protons are relatively well understood, and even predictable, the consequences of these modified electronic states on the spectroscopy of molecules has remained unknown. In this work, we find that photophysical properties of model phthalocyanine compounds and their aggregates display clear magnetic field dependences up to 25 T, with the aggregates showing more drastic magnetic field sensitivities depending on the intermolecular interactions with the amplification of ring currents in stacked aggregates. These observations are consistent with ring currents measured in NMR spectroscopy and simulated in time-dependent density functional theory calculations of magnetic field-dependent phthalocyanine monomer and dimer absorption spectra. We propose that ring currents in organic semiconductors, which commonly comprise aromatic moieties, may present new opportunities for the understanding and exploitation of combined optical, electronic, and magnetic properties.

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Scheid, Matthias, Michael Wimmer, Dario Bercioux e Klaus Richter. "Zeeman ratchets for ballistic spin currents". physica status solidi (c) 3, n. 12 (dicembre 2006): 4235–38. http://dx.doi.org/10.1002/pssc.200672835.

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ZHAO, HONG-KANG. "THERMAL NOISE OF DC JOSEPHSON CURRENT IN A SUPERCONDUCTOR-QUANTUM-DOT-SUPERCONDUCTOR SYSTEM". International Journal of Modern Physics B 16, n. 23 (10 settembre 2002): 3503–14. http://dx.doi.org/10.1142/s0217979202011536.

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The thermal noise of DC Josephson current in the superconducting leads coupled with a quantum dot system is investigated, and the general thermal current noise formula is derived in the presence of Zeeman field. The resonant structure versus gate voltage and Zeeman energy are displayed. Novel structures associated with the bound state and normal energy state are obtained. As the temperature is low, the Andreev reflection plays an important role in thermal noise and this provides new channels for electron to tunnel. However, if the temperature is high enough, the thermal noise due to Andreev reflection is trivial compared with the normal transport one. The thermal noise versus phase difference is also given to exhibit the temperature dependence. The Fano factor versus phase is much larger than 1 if the temperature is nonzero.

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Van der Westhuysen, Andre Jaco. "IMPROVED MODELLING OF WAVE-CURRENT INTERACTION IN SWAN". Coastal Engineering Proceedings 1, n. 32 (31 gennaio 2011): 45. http://dx.doi.org/10.9753/icce.v32.waves.45.

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Recent hindcast studies in the Amelander Zeegat tidal inlet in the Dutch Wadden Sea have shown the significant influence of currents on the prediction of wave fields by the spectral wave model SWAN. In following current, observations are typically well reproduced, but under strong opposing current, wave heights are significantly overestimated. Ris and Holthuijsen (1996) propose that such overestimations are due to insufficient steepness dissipation of waves on an opposing current gradient. The present paper presents a new formulation for the enhanced dissipation of waves on a counter current gradient which is scaled with the degree of Doppler shifting, and hence steepness increase, due to the current. This expression contains one additional unknown parameter, which is calibrated using laboratory observations. This formulation is suitable for both mature wave fields and young wind sea conditions. Application of this enhanced dissipation term to a data set of Amelander Zeegat field cases shows an improvement for opposing current situations in the tidal channel. For following current, no significant deterioration of results is found. In particular, the results for the young wind sea on the tidal flats are not significantly affected, unlike with the Ris and Holthuijsen (1996) expression.

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Xiao, Mufei, e Armando Reyes-Serrato. "Analytic Aharonov–Bohm rings — Currents readout from Zeeman spectrum". International Journal of Modern Physics B 30, n. 18 (11 luglio 2016): 1650106. http://dx.doi.org/10.1142/s021797921650106x.

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This paper reports the work on the development and analysis of a model for quantum rings in which persistent currents are induced by Aharonov–Bohm (AB) or other similar effects. The model is based on a centric and annual potential profile. The time-independent Schrödinger equation including an external magnetic field and an AB flux is analytically solved. The outputs, namely energy dispersion and wavefunctions, are analyzed in detail. It is shown that the rotation quantum number [Formula: see text] is limited to small numbers, especially in weak confinement, and a conceptual proposal is put forward for acquiring the flux and eventually estimating the persistent currents in a Zeeman spectroscopy. The wavefunctions and electron distributions are numerically studied and compared to one-dimensional (1D) quantum well. It is predicated that the model and its solutions, eigen energy structure and analytic wavefunctions, would be a powerful tool for studying various electric and optical properties of quantum rings.

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Huang, Bor-Luen, e S.-K. Yip. "Current response of a topological insulator to a static Zeeman field". Journal of Physics: Condensed Matter 28, n. 2 (18 dicembre 2015): 026002. http://dx.doi.org/10.1088/0953-8984/28/2/026002.

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Tie-Zheng, Guo, e Roger Stephens. "Behavior of Zeeman corrected atomic fluorescence at high source currents". Journal of Analytical Atomic Spectrometry 1, n. 5 (1986): 355. http://dx.doi.org/10.1039/ja9860100355.

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Kuramoto, H., K. Toi, N. Hiraki, K. Sato, J. Xu, A. Ejiri, K. Narihara et al. "Study of toroidal current penetration during current ramp in JIPP T-IIU with fast response Zeeman polarimeter". Nuclear Fusion 38, n. 1 (gennaio 1998): 59–73. http://dx.doi.org/10.1088/0029-5515/38/1/305.

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Più fonti

Tesi sul tema "Zeehan Current"

Cirano, Mauro School of Mathematics UNSW. "Wintertime Circulation within the Southeast Indian Ocean: a Numerical Study". Awarded by:University of New South Wales. School of Mathematics, 2000. http://handle.unsw.edu.au/1959.4/17820.

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A numerical study is made of the wintertime circulation within the Southeast Indian Ocean (SEIO). The downwelling favourable winds result in a continuous eastward Coastal Current (CC) extending from Cape Leeuwin to the eastern coast of Tasmania, where it forms a confluence with the south branch of the East Australian Current. An additional forcing mechanism for the CC is the Leeuwin Current in the western part of the domain. The study here is divided in two parts: (1) available data and the wintertime averaged results from the Ocean Circulation and Climate Advanced Model (OCCAM) are analysed to provide a first order description of the large-scale circulation; (2) a high resolution model (Princeton Ocean Model) is nested within OCCAM to examine the shelf-slope circulation within the eastern SEIO. The nested model is forced with climatological monthly average winds and several experiments were run to simulate the effects of surface fluxes of density, enhanced bottom friction and stronger winds. In summary, the shelf-slope circulation is governed by a surface south-eastward CC that carries around 2 Sv and reaches velocities of up to 50 cm/s, where the shelf is narrowest. The core of the current is generally constrained to the shelf-break region. Zonal winds and geostrophic control of the CC lead to a transport of 1 Sv through Bass Strait and a north-eastward jet that is directed into the strait between King Is. and Tasmania. Further south, the CC is poleward and known as the Zeehan Current (ZC). Between Cape Leeuwin and Tasmania and over the slope region, a westward current (the Flinders Current) is found at depths of 500-1000 m and has an associated transport of 5-7 Sv. The current is shown to result from a northward Sverdrup transport in the deep ocean. Meso-scale eddies are shown to result from baroclinic instability and have wavelengths of around 250 km and transports of 3-4 Sv, and can dominate the slope circulation. A comparison of the numerical results is also made with two current meter data sets and results show an interannual variability in the ZC strength, that is probably related to ENSO.

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Linder, Jacob, Takehito Yokoyama, Yukio Tanaka e Asle Sudbø. "Strongly spin-polarized current generated in a Zeeman-split unconventional superconductor". American Physical Society, 2008. http://hdl.handle.net/2237/11294.

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Libri sul tema "Zeehan Current"

Morawetz, Klaus. Kinetic Theory of Systems with SU(2) Structure. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198797241.003.0021.

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Systems with spin-orbit coupling and magnetic fields exhibit a SU(2) structure. Large classes of materials and couplings can be written into an effective spin-orbit coupled Hamiltonian with Pauli structure. Appropriate kinetic equations are derived keeping the quantum spinor structure. It results in coupled kinetic equations of scalar and vector distributions. The spin-orbit coupling, the magnetic field and the vector part of the selfenergy can be written in terms of an effective Zeeman field which couples both distributions. The currents and linear response are derived and the anomalous parts due to the coupling of the occurring band splitting are discussed. The response in magnetic fields reveals subtle retardation effects from which the classical and quantum Hall effect result as well as anomalous Hall effects. As application the dynamical conductivity of grapheme is successfully calculated and compared to the experiments.

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Capitoli di libri sul tema "Zeehan Current"

Barnes, Graham, e K. D. Leka. "Inferring Currents from the Zeeman Effect at the Solar Surface". In Electric Currents in Geospace and Beyond, 81–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119324522.ch5.

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AVRON, J., I. HERBST e B. SIMON. "The Zeeman Effect Revisited". In Current Physics–Sources and Comments, 244–46. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-444-88597-5.50034-x.

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KANAVI, S. C., e S. H. PATIL. "Dispersion Relations for the Zeeman Effect in the Hydrogen Atom". In Current Physics–Sources and Comments, 250–55. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-444-88597-5.50036-3.

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Merkt, FrÉdÉric. "Molecular-physics aspects of cold chemistry". In Current Trends in Atomic Physics, 82–141. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198837190.003.0003.

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Molecular-physics aspects of cold chemistry are introduced with the example of few-electron molecules. After a brief overview of general aspects of molecular physics, the solution of the molecular Schrödinger equation is presented based on the Born-Oppenheimer approximation and the subsequent evaluation of adiabatic, nonadiabatic, relativistic and radiative (QED) corrections. Low-temperature chemical phenomena are introduced with the example of ion-molecule reactions, using the classical Langevin model for barrier-free exothermic reactions as reference. Then, methods to generate cold few-electron molecules by supersonic-beam-deceleration methods such as Stark, Zeeman, and Rydberg-Stark decelerations are presented. Two astrophysically important reactions, the reaction between H2 and H2+ forming H3+ and H, a very fast reaction following Langevin-capture going over to quantum-Langevin capture at low temperature, and the radiative association reaction H+ + H forming H2+, a very slow reaction in which quantum effects (shape resonances) become important at low temperatures, are used to illustrate the concepts introduced.

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Avron, J. E., B. G. Adams, J. Čížek, M. Clay, M. L. Glasser, P. Otto, J. Paldus e E. Vrscay. "Bender-Wu Formula, the SO(4,2) Dynamical Group, and the Zeeman Effect in Hydrogen". In Current Physics–Sources and Comments, 247–49. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-444-88597-5.50035-1.

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Atti di convegni sul tema "Zeehan Current"

Dutra, Eric. "Determination of Plasma Sheath Current Distributions by Comparison of Zeeman Spectroscopy with B-dot Measurements in Laser Ablation Z-pinch Experiments". In 59th Annual Meeting of the APS Division of Plasma Physics APS Meeting, October 23-27, 2017, Milwaukee, WI. US DOE, 2017. http://dx.doi.org/10.2172/1755947.

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Icke, Vincent. "The Extreme Structures of our Universe". In International Conference on the 4th Game Set and Match (GSM4Q-2019). Qatar University Press, 2019. http://dx.doi.org/10.29117/gsm4q.2019.0030.

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My story is a tale of extremes. Extreme artificial structures that we have built on and around planet Earth. Extreme natural structures that exist in our Universe, and extreme structures in our mind, when we try to understand how this all works. Of all the possible artificial structures, consider telescopes. The first one, invented by Johannes Lipperhey of Zeeland, was soon copied by Galileo Galilei, which dramatically changed our understanding of the Universe. The object itself did not look very dramatic, but its human impact was extreme. Currently, engineers in Chile are building the European Extremely Large Telescope, which will contain a segmented mirror with a total diameter of 39 meters. The building of this extreme instrument could more than cover the full grounds of the original Leiden Observatory, which is the oldest still operating observatory in the world.

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