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1,196 results on '"Valle, V."'

1. Towards establishing a connection between two-level quantum systems and physical spaces

Author

Valle, V. G., Brugger, L. L., Rizzuti, B. F., and Duarte, Cristhiano

Subjects
Quantum Physics
Abstract

This work seeks to make explicit the operational connection between the preparation of two-level quantum systems with their corresponding description (as states) in a Hilbert space. This may sound outdated, but we show there is more to this connection than common sense may lead us to believe. To bridge these two separated realms -- the actual laboratory and the space of states -- we rely on a paradigmatic mathematical object: the Hopf fibration. We illustrate how this connection works in practice with a simple optical setup. Remarkably, this optical setup also reflects the necessity of using two charts to cover a sphere. Put another way, our experimental realization reflects the bi-dimensionality of a sphere seen as a smooth manifold., Comment: 10 pages, 2 figures, minor adjustments and a section added according to reviewer's suggestions

Published
2023
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3. Observation of Bulk Plasticity in a Polycrystalline Titanium Alloy by Diffraction Contrast Tomography and Topotomography

Author

Stinville, J. C., Ludwig, W., Callahan, P. G., Echlin, M. P., Valle, V., Pollock, T. M., and Proudhon, H.

Subjects
Condensed Matter - Materials Science
Abstract

The mechanical properties of polycrystalline metals are governed by the interaction of defects that are generated by deformation within the 3D microstructure. In materials that deform by slip, the plasticity is usually highly heterogeneous within the microstructure. Many experimental tools can be used to observe the results of slip events at the free surface of a sample; however, there are only a few methods for imaging these events in the bulk. In this article, the imaging of bulk slip events within the 3D microstructure are enabled by the combined use of X-ray diffraction contrast tomography and topotomography. Correlative measurements between high-resolution digital image correlation, X-ray diffraction contrast tomography, topotomography and phase contrast tomography are performed during deformation of Ti-7Al to investigate the sensitivity of the X-ray topotomography method for the observation of slip events in the bulk. Much larger neighborhoods of grains were able to be mapped than in previous studies, enabling quantitative measurements of slip transmission. Significant differences were observed between surface and bulk grains, indicating the need for 3D observations of plasticity to better understand deformation in polycrystalline materials., Comment: 23 pages, 12 figures

Published
2021
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14. Phylogeography of crossbills, bullfinches, grosbeaks, and rosefinches

Author

Arnaiz Villena, Antonio, Guillén, J., Ruiz del Valle, V., Lowy, E., Zamora, J., Varela Peña, Pilar, Stefani, D., Allende Martínez, Luis Miguel, Arnaiz Villena, Antonio, Guillén, J., Ruiz del Valle, V., Lowy, E., Zamora, J., Varela Peña, Pilar, Stefani, D., and Allende Martínez, Luis Miguel

Abstract

Mitochondrial cytochrome b (cyt b) from 24 Carduelini species including crossbills, bullfinches, grosbeaks, rosefinches, and other related, but not conclusively classified species, was sequenced. These sequences were also compared with all the available sequences from the genera Carduelis, Serinus, and Passer. Phylogenetic analyses consistently gave the same groups of finches and the calculated divergence times suggest that speciation of the studied species occurred between 14 and 3 million years ago (Miocene-Pliocene), appearing before the Passer, Carduelis, and Serinus genera. Pleistocene glaciations may have been important in subspeciation. Crossbills are integrated within the genus Carduelis, and within redpolls; the common crossbill shows subspeciation with Loxia japonica in the Pleistocene epoch. Pinicola enucleator groups together with bullfinches and is probably the ancestor of the group. Hawfinch is only distantly related to the studied groups, and might either represent an isolated genus or be related to the New World genus Hesperiphona. The grosbeak genera Eophona and Mycerobas are clearly sister groups, and species belonging to the former might have given rise to Mycerobas species. The isolated (in classification) Uragus sibiricus and Haematospiza sipahi are included within the genus Carpodacus (rosefinches); Carpodacus nipalensis is outside the genus Carpodacus in the molecular analyses and might be an isolated species or related to the genus Montifringilla., Depto. de Inmunología, Oftalmología y ORL, Fac. de Medicina, TRUE, pub

Published
2024

28. Traitement de texte et stratégies rédactionnelles

Author

Piolat, A, Isnard, N, and Della Valle, V

Subjects
Psychology: Applied Cognitive Psychology, Psychology: Psycholinguistics, Computer Science: Human Computer Interaction, Applied Cognitive Psychology, Psycholinguistics, Human Computer Interaction
Abstract

The objective of this experimental observation is to show how the use of a standard word processor changes the writing strategies devised by advanced users during the production of short texts. Empirical research has indicated that word processors, in fact, have a negative impact on writing strategies. Analysis of the conditions under which "man-machine" dialogue takes place, has shown that screen size and linear management both have an effect on writing. Before determining the ways in which a word processor can disrupt common writing practices, we must gain a better understanding of how a text is actually composed in real time, with or without a computer. Although the various writing processes have been clearly identified, the functional scenario describing the succession of writing phases and accompagnying activities is still poorly defined. The marks produced by writers on paper, whether linguistic (words, sentence fragments, sentences) or non-linguistic (arrows, underlining, indexation, diagrams, etc.), reflect the planning, translating, and revising processes being carried out by the writer. Sharples and Pemberton (1990) describe the exact functions of these marks in the elaboration of the ideas to be translated into text form (levels of organization). However, more knowledge about their frequency of use at the different stages of text composition is required. This is one of the goals of the present experimental observation. For the most part, such marks cannot be displayed and manipulated on the screen of a standard word processor as they can on paper. It is therefore crucial that we observe the means employed by writers to adapt their use of these necessary devices to word processing. The main results indicate that writers who use a word processor still resort to "pencil and paper" for the initial planning. The small amount of text preparation done by computer users (manifested by chronological and hierarchical organization marks) compared to writers who produce without a word processor is compensated by extensive revision on the screen. However, while writing strategies are highly dependent on production conditions, the quality of the texts produced does not vary significantly. The possibility of eliminating one of the important drawbacks of computer-assisted writing i. e. the fact that the information must be displayed linearly on the screen, is currently being studied by designers of planning aids that accompagny word processors. Before such aids can actually be developed, however, more knowledge is needed of the phases of writing and the marks used by writers throughout the production process.

Published
1993

31. Hyperuricemia as a prognostic marker of heart failure readmission and all-cause mortality in patients with acute decompensation of heart failure: a 5-year single center experience

Author

Vinueza Sanchez, D, primary, Zambrano Del Valle, V, additional, Cabello Montoya, F, additional, Munoz Vasquez, J, additional, Jimbo Paladines, J, additional, Khutsishvili, N, additional, Aslanova, R, additional, Kotova, E, additional, Tolkacheva, V V, additional, and Kobalava, Z H, additional

Published
2023
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33. Imagerie

Author

Della Valle, V., primary, Chalard, F., additional, Garel, C., additional, and Bensimon, J.-L., additional

Published
2018
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