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RISS 인기검색어
- 검색키워드
- 저자 : JONES THOMAS W. (검색결과 5 건)
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3D SIMULATIONS OF RADIO GALAXY EVOLUTION IN CLUSTER MEDIA
O'NEILL SEAN M.,SHEARER PAUL,TREGILLIS IAN L.,JONES THOMAS W.,RYU DONGSU The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.5
We present a set of high-resolution 3D MHD simulations exploring the evolution of light, supersonic jets in cluster environments. We model sets of high- and low-Mach jets entering both uniform surroundings and King-type atmospheres and propagating distances more than 100 times the initial jet radius. Through complimentary analyses of synthetic observations and energy flow, we explore the detailed interactions between these jets and their environments. We find that jet cocoon morphology is strongly influenced by the structure of the ambient medium. Jets moving into uniform atmospheres have more pronounced backflow than their non-uniform counterparts, and this difference is clearly reflected by morphological differences in the synthetic observations. Additionally, synthetic observations illustrate differences in the appearances of terminal hotspots and the x-ray and radio correlations between the high- and low-Mach runs. Exploration of energy flow in these systems illustrates the general conversion of kinetic to thermal and magnetic energy in all of our simulations. Specifically, we examine conversion of energy type and the spatial transport of energy to the ambient medium. Determination of the evolution of the energy distribution in these objects will enhance our understanding of the role of AGN feedback in cluster environments.
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Double-row transport in quantum wires of shallow confinement
Hew, W.K.,Thomas, K.J.,Pepper, M.,Farrer, I.,Anderson, D.,Jones, G.A.C.,Ritchie, D.A. North-Holland 2010 Physica E, Low-dimensional systems & nanostructure Vol.42 No.4
The bifurcation of the electron system in a quantum wire has been observed in the form of the suppression and disappearance of the quantised conductance plateau at 2e<SUP>2</SUP>/h. We now present low-temperature transport measurements of a top-gated split-gate quantum wire that serve to further characterise this double-row regime of transport. A small distortion of the confinement caused by asymmetrical biasing of the split gates gives rise to a radical change in the conductance characteristics of the wire, beginning with the introduction of a plateau at G=e<SUP>2</SUP>/h which rises to around 0.7x2e<SUP>2</SUP>/h with greater differential bias between the split gates. DC source-drain bias measurements in this regime show a split zero-bias peak at low conductances merging into a single peak around G=0.7xe<SUP>2</SUP>/h, which then persists up to the plateau at 4e<SUP>2</SUP>/h.
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Coupled double-row formation in a quasi-1D wire
Smith, L.W.,Hew, W.K.,Thomas, K.J.,Pepper, M.,Farrer, I.,Anderson, D.,Jones, G.A.C.,Ritchie, D.A. North-Holland 2010 Physica E, Low-dimensional systems & nanostructure Vol.42 No.4
We investigate one-dimensional (1D) quantum wires in the weak confinement regime, where, at certain densities, the 1D system of electrons bifurcates into two rows. We show that the two rows are coupled, forming bonding and antibonding states, and that the coupling persists in magnetic fields from 0 to 16 T. In order for a double row to form, the Coulomb interactions in the channel must overcome the confining potential, which can be achieved by tuning the density and confinement. Using a split-gate device with a top gate and back gate, we observe a transition from single-row to double-row behaviour in the weak confinement regime. We further probe the characteristics of the coupled double row regime with dc source-drain bias measurements.
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Searching for Resonances in the Unbound 6Be Nucleus by Using a Radioactive 7Be Beam
채경육,D. W. Bardayan,J. C. Blackmon,M. S. Smith,A. E. Champagne,J. J. Das,R. P. Fitzgerald,D. W. Visser,V. Guimaraes,K. L. Jones,S. D. Pain,J. S. Thomas,M. S. Johnson,R. L. Kozub,R. J. Livesay,Z. Ma,C. 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.11
Knowledge of the <sup>3</sup>He(<sup>3</sup>He,<sup>2</sup><i>p</i>)<sup>4</sup>He reaction is important for understanding stellar burning and solar neutrino production. Previous measurements have found a surprisingly large rise in the cross section at low energies that could be due to a low-energy resonance in the <sup>3</sup>He + <sup>3</sup>He (<sup>6</sup>Be) system or electron screening. In the <sup>6</sup>Be nucleus, however, no excited states have been observed above the first 2<sup>+</sup> state at <i>E<sub>x</sub></i> = 1.67 MeV up to 23 MeV, even though several are expected. The <sup>2</sup>H(<sup>7</sup>Be,<sup>3</sup>H)<sup>6</sup>Be reaction has been studied for the first time to search for resonances in the <sup>6</sup>Be nucleus that may affect our understanding of the <sup>3</sup>He(<sup>3</sup>He,<sup>2</sup><i>p,</i>)<sup>4</sup>He reaction. A 100-MeV radioactive <sup>7</sup>Be beam from the Holifield Radioactive Ion Beam Facility (HRIBF) was used to bombard CD<sub>2</sub> targets, and tritons were detected by using the silicon detector array (SIDAR). A combination of reaction mechanisms appears to be necessary to explain the observed triton energy spectrum.
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Multidisciplinary fingerprints: forensic reconstruction of an insect reinvasion
Kim, Kyung Seok,Jones, Gretchen D.,Westbrook, John K.,Sappington, Thomas W. The Royal Society 2010 Journal of the Royal Society, Interface Vol.7 No.45
<P> An unexpected outbreak of boll weevils, <I>Anthonomus grandis</I> , an insect pest of cotton, across the Southern Rolling Plains (SRP) eradication zone of west-central Texas, USA, was detected soon after passage of Tropical Storm Erin through the Winter Garden district to the south on 16 August 2007. The synchrony and broad geographic distribution of the captured weevils suggest that long-distance dispersal was responsible for the reinvasion. We integrated three types of assessment to reconstruct the geographic origin of the immigrants: (i) DNA fingerprinting; (ii) pollen fingerprinting; and (iii) atmospheric trajectory analysis. We hypothesized the boll weevils originated in the Southern Blacklands zone near Cameron, or in the Winter Garden district near Uvalde, the nearest regions with substantial populations. Genetic tests broadly agree that the immigrants originated southeast of the SRP zone, probably in regions represented by Uvalde or Weslaco. The SRP pollen profile from weevils matched that of Uvalde better than that of Cameron. Wind trajectories supported daily wind-aided dispersal of weevils from the Uvalde region to the SRP from 17 to 24 August, but failed to support migration from the Cameron region. Taken together the forensic evidence strongly implicates the Winter Garden district near Uvalde as the source of reinvading boll weevils. </P>
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