18,250 research outputs found

    Quantum Conductance in Silver Nanowires: correlation between atomic structure and transport properties

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    We have analyzed the atomic arrangements and quantum conductance of silver nanowires generated by mechanical elongation. The surface properties of Ag induce unexpected structural properties, as for example, predominance of high aspect ratio rod-like wires. The structural behavior was used to understand the Ag quantum conductance data and the proposed correlation was confirmed by means of theoretical calculations. These results emphasize that the conductance of metal point contacts is determined by the preferred atomic structures and, that atomistic descriptions are essential to interpret the quantum transport behavior of metal nanostructures.Comment: 4 pages, 4 figure

    ‘Teaching Bi/Multilinguals About Deconstruction is Almost Redundant’: How Migrant Experiences of Bi/Multilingualism Must (Re)Shape Translation Studies.

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    This essay brings together texts and analytical methods from a literary theory, translation studies, gender studies, critical race theory, linguistics and Twitter, aiming, to emphasize a number of related points. Firstly, the necessity of intersectional reflection of the translation practices centralized and marginalised in and by Translation Studies, and national language policies more widely. For example, by the prioritization of written above oral language ability, according to a European monolingual norm, within which a second language is known and acquired through voluntary study rather than everyday use. I suggest that the study of translation is always the study of geopolitics, and should be recognised as such. Secondly, the importance of the Derridean notion of having and not-having language, and of the imperative to translate and of the untranslatable, for which, again, we should use an intersectional analysis. I suggest that the study of translation is always the study of untranslatability. Thus bi/multilingual migratory experience provides not only the subject of the study of translation, but an epistemological framework, in which what is at stake in translation can be understood

    The Evolution of the Baryonic Tully-Fisher Relation over the past 6 Gyr

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    Scaling relations are salient ingredients of galaxy evolution and formation models. I summarize results from the IMAGES survey, which combines spatially-resolved kinematics from FLAMES/GIRAFFE with imaging from HST/ACS and other facilities. Specifically, I will focus on the evolution of the stellar mass and baryonic Tully-Fisher Relations (TFR) from z=0.6 down to z=0. We found a significant evolution in zero point and scatter of the stellar mass TFR compared to the local Universe. Combined with gas fractions derived by inverting the Schmidt-Kennicutt relation, we derived for the first time a baryonic TFR at high redshift. Conversely to the stellar mass TFR, the baryonic relation does not appear to evolve in zero point, which suggests that most of the reservoir of gas converted into stars over the past 6 Gyr was already gravitationally bound to galaxies at z=0.6.Comment: To be published in the proceedings of the IAU Symposium 277 "Tracing the Ancestry of Galaxies"; 4 pages, 1 figur
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