1,721,071 research outputs found
Premessa
No full textCe dossier monographique se concentre sur un sujet longuement négligé par l’historiographie italienne des XIXe et XXe siècles: les discours électoraux ou «professions de foi» électorales. Les auteurs adoptent une approche méthodologique fondée sur l’analyse qualitative de la dimension discursive de l’action politique, étudiant simultanément les idées, les langages et les pratiques du moment électoral. Les six articles concernent l’Europe méditerranéenne (Espagne, France, Italie) et recouvrent la période allant de 1848 à l’entre-deux-guerres: les discours électoraux y sont analysés, aussi bien comme révélateurs des transformations de la sphère politique entre le XIXe et le XXe siècle, que comme indices de la rencontre de l’ancien et du moderne qui caractèrise les processus de démocratisation politique
Microscopic Optical Potentials: Recent achievements and future perspectives
Full text linkFew years ago we started the investigation of microscopic Optical Potentials (OP) in the framework of chiral effective field theories [1, 2] and published our results in a series of manuscripts. Starting from the very first work [3], where a microscopic OP was introduced following the multiple scattering procedure of Watson [4], and then followed by Refs. [5, 6], where the agreement with experimental data and phenomenological approaches was successfully tested, we finally arrived at a description of elastic scattering processes off non-zero spin nuclei [7]. Among our achievements, it is worth mentioning the partial inclusion of three-nucleon forces [8], and the extension of our OP to antiproton-nucleus elastic scattering [9]. Despite the overall good agreement with empirical data obtained so far, we do believe that several improvements and upgrades of the present approach are still to be achieved.In this short essay we would like to address some of the most relevant achievements and discuss an interesting development that, in our opinion, is needed to further improve microscopic OPs in order to reach in a near future the same level of accuracy of the phenomenological ones
Nuclear pairing from two-body microscopic forces: analysis of the Cooper pair wavefunctions
No full textIn a recent paper [1] we studied the behavior of the pairing gaps ΔF as a function of the Fermi momentum kF for neutron and nuclear matter in all relevant angular momentum channels where superfluidity is believed to naturally emerge. The calculations employed realistic chiral nucleon-nucleon potentials [2, 3] with the inclusion of three-body forces and self-energy effects. In this contribution, after a detailed description of the numerical method we employed in the solution of the BCS equations, we will show a preliminary analysis of the Cooper pair wavefunctions
I manuali elettorali nella Francia contemporanea (1870-1945). Materiali per un censimento bibliografico della letteratura di edificazione civica
No full textTraduzione del contributo di Yves Déloye al numero monografico di Dimensioni e problemi della ricerca storica
su "A scuola di voto. Catechismi, manuali e istruzioni elettorali fra Otto e Novecento"
L’organizzazione della politica nell’Italia liberale: due casi di studio
No full textCette introduction méthodologique propose d’affiner (et d’appliquer à l’étude de l’Italie post-unitaire) la notion «d’organisation de la politique», explicitée par Raymond Huard (La naissance du parti politique en France, Presses de la FNSP, Paris, 1996) afin d’analyser des formes politiques qui ne sont pas réductables au seul cliéntèlisme des notables, ni à la forme parti moderne, dans la France des premières décennies de la IIIe République. Ce processus de diffusion de la sociabilité et de la communication politique, dont les protagonistes sont d’une part les comités, cercles, associations, journaux, et d’autre part les leaders, députés, notables et journalistes, constitue des constellations politiques flexibles de structure pyramidale. À la base on trouve un tissu associatif solide et un réseau de relations personelles; en position intermédiaire, avec fonction de liaison, des échanges de lettres, la presse et ses circuits, et les notables qui, dans le même temps, maintiennent les contacts avec les leaders locaux ou régionaux. Au sommet, les leaders nationaux travaillent à la construction d’un discours politique unitaire capable de regrouper ces archipels politiques complexes et variés que le contemporains appellent des «partis»
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Molecular cytogenetic dissection of human chromosome 3 and 21 evolution
No full textChromosome painting in placental mammalians illustrates that genome evolution is marked by chromosomal synteny conservation and that the association of chromosomes 3 and 21 may be the largest widely conserved syntenic block known for mammals. We studied intrachromosomal rearrangements of the syntenic block 3/21 by using probes derived from chromosomal subregions with a resolution of up to 10-15 Mbp. We demonstrate that the rearrangements visualized by chromosome painting, mostly translocations, are only a fraction of the actual chromosomal changes that have occurred during evolution. The ancestral segment order for both primates and carnivores is still found in some species in both orders. From the ancestral primate/carnivore condition an inversion is needed to derive the pig homolog, and a fission of chromosome 21 and a pericentric inversion is needed to derive the Bornean orangutan condition. Two overlapping inversions in the chromosome 3 homolog then would lead to the chromosome form found in humans and African apes. This reconstruction of the origin of human chromosome 3 contrasts with the generally accepted scenario derived from chromosome banding in which it was proposed that only one pericentric inversion was needed. From the ancestral form for Old World primates (now found in the Bornean orangutan) a pericentric inversion and centromere shift leads to the chromosome ancestral for all Old World monkeys. Intrachromosomal rearrangements, as shown here, make up a set of potentially plentiful and informative markers that can be used for phylogenetic reconstruction and a more refined comparative mapping of the genome
Relativistic Hartree-Bogoliubov model with density-dependent meson-nucleon couplings
No full textThe relativistic Hartree-Bogoliubov (RHB) model is extended to include density-dependent meson-nucleon couplings. The effective Lagrangian is characterized by a phenomenological density dependence of the σ, ω, and ρ meson-nucleon vertex functions, adjusted to properties of nuclear matter and finite nuclei. Pairing correlations are described by the pairing part of the finite range Gogny interaction. The new density-dependent effective interaction DD-ME1 is tested in the analysis of the equations of state for symmetric and asymmetric nuclear matter, and of ground-state properties of the Sn and Pb isotopic chains. Results of self-consistent RHB calculations are compared with experimental data, and with results previously obtained in the RHB model with nonlinear self-interactions, as well as in the density-dependent relativistic hadron field (DDRH) model. Parity-violating elastic electron scattering on Pb and Sn nuclei is calculated using a relativistic optical model with inclusion of Coulomb distortion effects, and the resulting asymmetry parameters are related to the neutron round-state density distributions
The active gene that encodes human high mobility group 1 protein contains introns and maps to chromosome 13
No full textThe human genome contains a large number of sequences related to the cDNA for High Mobility Group 1 protein (HMG1), which so far has hampered the cloning and mapping of the active HMG1 gene, We show that the human HMG1 gene contains introns, while the HMG1-related sequences do not and most likely are retrotransposed pseudogenes, We identified eight YACs from the ICI and CEPH libraries that contain the human HMG1 gene, The HMG1 gene is similar in structure to the previously characterized murine homologue and maps to human chromosome 13 band q12, as determined by in situ hybridization, The mouse Hmg1 gene maps to the telomeric region of murine Chromosome 5, which is syntenic to the human 13q12 band
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