131,095 research outputs found
Ardigò A. - Giuntella P. - Ruffilli R. – Scoppola P., Aldo Moro e Vittorio Bachelet. Memoria per il futuro. A cura di V. Passerini, Il Margine, Trento 2008
No full textIl contributo presenta la recensione del volume: Ardigò A. - Giuntella P. - Ruffilli R. – Scoppola P., Aldo Moro e Vittorio Bachelet. Memoria per il futuro. A cura di V. Passerini, Il Margine, Trento 200
Goux C., Fargue J., Bachelet D., Bithorel M. — L'économie française. Diagnostic 1968, Perspectives 1969.
No full textC. M. Goux C., Fargue J., Bachelet D., Bithorel M. — L'économie française. Diagnostic 1968, Perspectives 1969.. In: Population, 25ᵉ année, n°1, 1970. pp. 164-165
Goux C., Fargue J., Bachelet D., Bithorel M. — L'économie française. Diagnostic 1968, Perspectives 1969.
No full textC. M. Goux C., Fargue J., Bachelet D., Bithorel M. — L'économie française. Diagnostic 1968, Perspectives 1969.. In: Population, 25ᵉ année, n°1, 1970. pp. 164-165
Elementi di fisica atomica, molecolare e dei solidi
No full textIl libro raccoglie le dispense del corso di Struttura della Materia tenuto dagli autori presso il corso di laurea triennale in Fisica della Sapienza Università di Roma. Il testo si concentra su un limitato numero di problemi della fisica e della chimica della materia, dall’esistenza stessa di un atomo alla struttura della Tavola Periodica, dal legame fra gli atomi che dà luogo a molecole e solidi al motivo per cui alcuni solidi sono isolanti e altri conduttori. La soluzione di questi problemi, che storicamente ha decretato il trionfo della meccanica quantistica nei primi trent’anni del secolo scorso, rappresenta oggi, nel corso di laurea in Fisica, una delle sue prime applicazioni concrete. Da questo punto di vista il libro può costituire anche per docenti e studenti dei corsi di laurea triennale in Chimica o Ingegneria dei Materiali un utile sussidio.The book collects the lecture notes of an undegraduate course on atomic, molecular and solid-state physics for the BS in Physics at the Sapienza University of Rome. It deals at an elementary level, based on concepts and tools learned by the student in previous undergraduate courses of Mathematical Methods of Physics, Quantum Mechanics and Statistical Mechanics, with a limited number of phenomena whose interpretation marked the birth and the triumph of quantum mechanics in the first three decades of the last century: the very existence of a stable atom to the absorption and emission of light by simple atoms, the periodic properties of the elements, the origin of the chemical bond in molecules and the metallic or insulating nature of solids
Il coordinamento nella trama costituzionale: spunti di riflessione
No full textIl contributo si interroga sulla nozione di coordinamento come istituto di diritto pubblico nel rapporto tra amministrazione e Costituzione, alla luce dell'insegnamento di Vittorio Bachelet. La riflessione evidenzia il carattere poliedrico della nozione di coordinamento e la sua espansione nei rapporti tra Stato e regioni dopo la revisione del Titolo V della Parte seconda della Costituzione. L'indagine tocca infine il principio della leale collaborazione nei rapporti istituzionali come espressione del metodo del coordinamento
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
Absence of superconductivity in iron polyhydrides at high pressures
No full textRecently, C. M. Pépin et al. [Science 357, 382 (2017)] reported the formation of several new iron polyhydrides FeHx at pressures in the megabar range and spotted FeH5, which forms above 130 GPa, as a potential high-Tc superconductor because of an alleged layer of dense metallic hydrogen. Shortly after, two studies by A. Majumdar et al. [Phys. Rev. B 96, 201107 (2017)] and A. G. Kvashnin et al. [J. Phys. Chem. C 122, 4731 (2018)] based on ab initio Migdal-Eliashberg theory seemed to independently confirm such a conjecture. We conversely find, on the same theoretical-numerical basis, that neither FeH5 nor its precursor, FeH3, shows any conventional superconductivity and explain why this is the case. We also show that superconductivity may be attained by transition-metal polyhydrides in the FeH3 structure type by adding more electrons to partially fill one of the Fe-H hybrid bands (as, e.g., in NiH3). Critical temperatures, however, will remain low because the
d-metal bonding, and not the metallic hydrogen, dominates the behavior of electrons and phonons involved in the superconducting pairing in these compounds
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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