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Search Results: 1 - 10 of 325881 matches for " S. Hardy "
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Enjeux et fractures de la Bolivie en 2009
Sébastien Hardy
EchoGéo , 2009,
Abstract: La troisième consultation référendaire organisée légalement sous le mandat du Président Evo Morales (2006-2010) a eu lieu le 25 janvier 2009. L’enjeu de cette consultation portait sur l’approbation du texte d’une nouvelle Constitution pour la Bolivie, ainsi que sur la limitation de la superficie de la propriété foncière. Les résultats pris globalement laissent penser que les propositions du Président satisfont les Boliviens. Pourtant, en changeant l’échelle d’interprétation des résultats, on retrouve les classiques dissensions qui polarisent depuis longtemps, et toujours plus, le pays. The third legally organized referendum under the mandate of President Evo Morales (2006-2010) took place on January 25, 2009. What is at stake in this consultation is the approval of the text of a new Constitution for Bolivia, and the limitation of the area of the land ownership. The results taken as a whole lead one to believe that the proposals of the President satisfy Bolivians. However, by looking at the bigger picture, one finds the traditional dissensions which have polarized the country for a long time, and continue to do so. La tercera consulta por referéndum organizada legalmente bajo el mandato del Presidente Evo Morales (2006-2010) tuvo lugar el 25 de enero de 2009. El desafío de esta consulta se refería a la aprobación del texto de una nueva Constitución para Bolivia, y a la limitación de la superficie de la propiedad de la tierra. Globalmente, los resultados dejan pensar que las propuestas del Presidente satisfacen a los Bolivianos. Sin embargo, al cambiar la escala de interpretación de los resultados, se encuentran las clásicas disensiones que polarizan desde hace tiempo, y siempre más, el país.
La question de la question : en réponse à Lyotard
Jean-Sébastien Hardy
Phares : Revue Philosophique étudiante de l’Université Laval , 2006,
Abstract:
Immanence: langage, connaissance
Hardy, Jean-Sébastien
Phares : Revue Philosophique étudiante de l’Université Laval , 2007,
Abstract:
LA METáFORA EN ARISTóTELES Y SU CONTRIBUCIóN A LA COMPRENSIóN METAPHOR IN ARISTOTLE AND ITS CONTRIBUTION TO COMPREHENSION
HARDY NEUMANN S0TO
Byzantion Nea Hellás , 2012,
Abstract: En el siguiente artículo abordo aspectos específicos de la caracterización aristotélica de la metáfora. Sostengo que ella contribuye al logro de la comprensión, y que la forma en que lo hace va en íntima relación con el modo en que se configura en el lenguaje como uso expresivo. Para cumplir con el designio propuesto se revisan pasajes centrales sobre el tema en la filosofía aristotélica, se los discute, se los somete a valoración, y amplía reflexivamente. In this paper I discuss specific aspects of Aristotle's characterization of metaphor. I argue that the metaphor contributes to the understanding and that the way she does that is closely related to the way it is set in the language as expressive use. To meet the intended purpose central subject passages in Aristotle's philosophy are discussed, submitted to valuation and extended reflectively.
Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model
Hardy, J. C.;Towner, I. S.
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevC.79.055502
Abstract: A new critical survey is presented of all half-life, decay-energy and branching-ratio measurements related to 20 0+ to 0+ beta decays. Compared with our last review, there are numerous improvements: First, we have added 27 recently published measurements and eliminated 9 references; of particular importance, the new data include a number of high-precision Penning-trap measurements of decay energies. Second, we have used the recently improved isospin symmetry-breaking corrections. Third, our calculation of the statistical rate function now accounts for possible excitation in the daughter atom. Finally, we have re-examined the systematic uncertainty associated with the isospin symmetry-breaking corrections by evaluating the radial-overlap correction using Hartree-Fock radial wave functions and comparing the results with our earlier calculations, which used Saxon-Woods wave functions; the provision for systematic uncertainty has been changed as a consequence. The new corrected Ft values are impressively constant and their average, when combined with the muon liftime, yields the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, V_{ud} = 0.97425(22). The unitarity test on the top row of the matrix becomes |V_{ud}|^2 + |V_{us}|^2 + |V_{ub}|^2 = 0.99995(61). Both V_{ud} and the unitarity sum have significantly reduced uncertainties compared with our previous survey, although the new value of V_{ud} is statistically consistent with the old one. From these data we also set limits on the possible existence of scalar interactions, right-hand currents and extra Z bosons. Finally, we discuss the priorities for future theoretical and experimental work with the goal of making the CKM unitarity test even more definitive.
An improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi beta decay
Towner, I. S.;Hardy, J. C.
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevC.77.025501
Abstract: We report new shell-model calculations of the isospin-symmetry-breaking correction to superallowed nuclear beta decay. The most important improvement is the inclusion of core orbitals, which are demonstrated to have a significant impact on the mismatch in the radial wave functions of the parent and daughter states. We determine which core orbitals are important to include from an examination of measured spectroscopic factors in single-nucleon pick-up reactions. We also examine the new radiative-correction calculation by Marciano and Sirlin and, by a simple reorganization, show that it is possible to preserve the conventional separation into a nucleus-independent inner radiative term and a nucleus-dependent outer term. We tabulate new values for the three theoretical corrections for twenty superallowed transitions, including the thirteen well-studied cases. With these new correction terms the corrected Ft values for the thirteen cases are statistically consistent with one another and the anomalousness of the 46V result disappears. These new calculations lead to a lower average Ft value and a higher value of Vud. The sum of squares of the top-row elements of the CKM matrix now agrees exactly with unitarity.
Superallowed Fermi beta decay
J. C. Hardy,I. S. Towner
Physics , 1998, DOI: 10.1063/1.57367
Abstract: Superallowed $0^+ \to 0^+$ nuclear beta decay provides a direct measure of the weak vector coupling constant, $\GV$. We survey current world data on the nine accurately determined transitions of this type, which range from the decay of $^{10}$C to that of $^{54}$Co, and demonstrate that the results confirm conservation of the weak vector current (CVC) but differ at the 98% confidence level from the unitarity condition for the Cabibbo-Kobayashi-Maskawa (CKM) matrix. We examine the reliability of the small calculated corrections that have been applied to the data, and assess the likelihood of even higher quality nuclear data becoming available to confirm or deny the discrepancy. Some of the required experiments depend upon the availability of intense radioactive beams. Others are possible today.
Superallowed Beta Decay of Nuclei with A >or= 62: The Limiting Effect of Weak Gamow-Teller Branches
J. C. Hardy,I. S. Towner
Physics , 2003, DOI: 10.1103/PhysRevLett.88.252501
Abstract: The most precise value of V_{ud}, which is obtained from superallowed nuclear beta decay, leads to a violation of CKM unitarity by 2.2 sigma. Experiments are underway on two continents to test and improve this result through decay studies of odd-odd N = Z nuclei with A >or= 62. We show, in a series of illustrative shell-model calculations, that numerous weak Gamow-Teller branches are expected to compete with the superallowed branch in each of these nuclei. Though the total Gamow-Teller strength is significant, many of the individual branches will be unobservably weak. Thus, new techniques must be developed if reliable ft-values are to be obtained with 0.1% precision for the superallowed branches.
CURRENTS AND THEIR COUPLINGS IN THE WEAK SECTOR OF THE STANDARD MODEL
I. S. Towner,J. C. Hardy
Physics , 1995,
Abstract: Beta-decay and muon-capture experiments in nuclei are reviewed. The conserved vector current hypothesis is confirmed through the observed constancy of the vector coupling constant determined from the superallowed Fermi transitions and from the measurement of the weak-magnetism term in mirror Gamow-Teller transitions. The axial-vector and pseudoscalar coupling constants in the nucleon are determined from neutron decay and muon capture on the proton respectively. In finite nuclei, evidence for these coupling constants being reduced relative to their free-nucleon values is discussed. Meson-exchange currents are shown to be an important correction to the time-like part of the axial current as evident in first-forbidden beta decays. Tests of the Standard Model are discussed, as well as extensions beyond it involving right-hand currents and scalar interactions.
An improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi beta decay
I. S. Towner,J. C. Hardy
Physics , 2007, DOI: 10.1103/PhysRevC.77.025501
Abstract: We report new shell-model calculations of the isospin-symmetry-breaking correction to superallowed nuclear beta decay. The most important improvement is the inclusion of core orbitals, which are demonstrated to have a significant impact on the mismatch in the radial wave functions of the parent and daughter states. We determine which core orbitals are important to include from an examination of measured spectroscopic factors in single-nucleon pick-up reactions. We also examine the new radiative-correction calculation by Marciano and Sirlin and, by a simple reorganization, show that it is possible to preserve the conventional separation into a nucleus-independent inner radiative term and a nucleus-dependent outer term. We tabulate new values for the three theoretical corrections for twenty superallowed transitions, including the thirteen well-studied cases. With these new correction terms the corrected Ft values for the thirteen cases are statistically consistent with one another and the anomalousness of the 46V result disappears. These new calculations lead to a lower average Ft value and a higher value of Vud. The sum of squares of the top-row elements of the CKM matrix now agrees exactly with unitarity.
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