131,496 research outputs found
phi, rho and omega production in collisions induced by deuteron and heavy ions around 200 GeV per nucleon
No full textThe production of low mass dimuons has been measured in d-C, d-U and S-U collisions at 200 GeV per nucleon, and in Pb-Pb collisions at 158 GeV per nucleon. phi/(omega + rho) ratio and phi and omega + rho cross sections are studied showing phi increase relatively to the omega + rho, with increasing size of the system or centrality, and cross sections increase rates which are different in ion and deuteron induced reactions
La mie laulan kons mie jouan (3/4 D)
No full textLaulun sanat: La mie laulan, kons mie jouan, Kons mie jouan laulamahan
Ο' Βanion (John D.), Reorienting Rhetoric. The Dialectic of list and Story. 1992
No full textJouan François. Ο' Βanion (John D.), Reorienting Rhetoric. The Dialectic of list and Story. 1992. In: Revue des Études Anciennes. Tome 99, 1997, n°1-2. pp. 226-227
A.-D.-C. Peterson : L' Extrême-Orient. Géographie sociale. Avec 21 cartes. Traduit par R. Jouan
No full textBeaujeu-Garnier Jacqueline. A.-D.-C. Peterson : L' Extrême-Orient. Géographie sociale. Avec 21 cartes. Traduit par R. Jouan. In: L'information géographique, volume 15, n°2, 1951. p. 83
16. Dionysiaca. Nine Studies in Greek Poetry by former pupils, presented to Sir Denys Page on his seventieth Birthday. Edited by R. D. Dawe, J. Diggle, P. E. Easterling
No full textJouan François. 16. Dionysiaca. Nine Studies in Greek Poetry by former pupils, presented to Sir Denys Page on his seventieth Birthday. Edited by R. D. Dawe, J. Diggle, P. E. Easterling. In: Revue des Études Grecques, tome 92, fascicule 436-437, Janvier-juin 1979. p. 260
16. Dionysiaca. Nine Studies in Greek Poetry by former pupils, presented to Sir Denys Page on his seventieth Birthday. Edited by R. D. Dawe, J. Diggle, P. E. Easterling
No full textJouan François. 16. Dionysiaca. Nine Studies in Greek Poetry by former pupils, presented to Sir Denys Page on his seventieth Birthday. Edited by R. D. Dawe, J. Diggle, P. E. Easterling. In: Revue des Études Grecques, tome 92, fascicule 436-437, Janvier-juin 1979. p. 260
The production of phi, omega and rho mesons in p-, d-, S- and Pb-induced reactions at the CERN SPS
No full textOn the controllability of the quantum dynamics of closed and open systems
No full textWe investigate the controllability of quantum systems in two different settings: the standard "closed" setting, in which a quantum system is seen as isolated
and the control problem is formulated on the Schrödinger equation; the open setting that describes a quantum system in interaction with a larger one, of which
just qualitative parameters are known, by means of the Lindblad equation on states.
In the context of closed systems we focus our attention to an interesting class of models, namely the spin-boson models. The latter describe the interaction between a 2-level quantum system and finitely many distinguished modes of a bosonic field. We discuss two prototypical examples, the Rabi model and the Jaynes-Cummings model, which despite their age are still very popular in several fields of quantum physics. Notably, in the context of cavity Quantum Electro Dynamics (C-QED) they provide an approximate yet accurate description of the dynamics of a 2-level atom in a resonant microwave cavity, as in recent experiments of S. Haroche. We investigate the controllability properties of these models, analyzing two different types of control operators acting on the bosonic part, corresponding -in the application to cavity QED- to an external electric and magnetic field, respectively. We review some recent results and prove the approximate controllability of the Jaynes-Cummings model with these controls. This result is based on a spectral analysis exploiting the non-resonances of the spectrum. As far as the relation between the Rabi and the Jaynes-Cummings Hamiltonians concerns, we treat the so called rotating wave
approximation in a rigorous framework. We formulate the problem as an adiabatic limit in which the detuning frequency and the interaction strength parameter goes to zero, known as the weak-coupling regime. We prove that, under certain hypothesis on the ratio between the detuning and the coupling, the Jaynes-Cumming and the Rabi dynamics exhibit the same behaviour, more precisely the evolution operators they generate are close in norm.
In the framework of open quantum systems we investigate the controllability of the Lindblad equation. We consider a control acting adiabatically on the internal part of the system, which we see as a degree of freedom that can be used to contrast the action of the environment. The adiabatic action of the control is chosen to produce a robust transition. We prove, in the prototype case of a two-level system, that the system approach a set of equilibrium points determined by the environment, i.e. the parameters that specify the Lindblad operator. On that set the system can be adiabatically steered choosing a suitable control. The analysis is based on the application of geometrical singular perturbation methods
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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