1,722,045 research outputs found
La regolazione dell’impresa tramite l’istituto delle concessioni (con gallucci c malgarini m galli g)
No full textStructural properties of water in confined geometries: an ab initio molecular dynamics description
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ELECTRONIC-STRUCTURE CALCULATIONS AND MOLECULAR-DYNAMICS SIMULATIONS WITH LINEAR SYSTEM-SIZE SCALING
No full textWe present a method for total-energy minimizations and molecular-dynamics simulations based either on tight-binding or on Kohn-Sham Hamiltonians. The method leads to an algorithm whose computational cost scales linearly with the system size. The key features of our approach are (i) an orbital formulation with single-particle wave functions constrained to be localized in given regions of space, and (ii) an energy functional that does not require either explicit orthogonalization of the electronic orbitals, or inversion of an overlap matrix. The foundations and accuracy of the approach and the performances of the algorithm are discussed, and illustrated with several numerical examples including Kohn-Sham Hamiltonians. In particular, we present calculations with tight-binding Hamiltonians for diamond, graphite, a carbon linear chain, and liquid carbon at low pressure. Even for a complex case such as liquid carbon-a disordered metallic system with differently coordinated atoms-the agreement between standard diagonalization schemes and our approach is very good. Our results establish the accuracy and reliability of the method for a wide class of systems and show that tight-binding molecular-dynamics simulations with a few thousand atoms are feasible on small workstations
Il mercato delle case di legno: analisi strategica di un caso reale
Full text linkIl presente lavoro vuole restituire un’analisi strategica di un caso reale di impresa, operante nel settore delle case di legno. Dopo aver delineato le caratteristiche generali del settore in cui l’impresa svolge la propria attività, ne viene approfondito il modello competitivo specifico per individuare possibili vie di sviluppo. L’obiettivo del lavoro è di fornire un caso reale di analisi strategica, condotta su un’impresa che opera sul mercato e che, per motivi di riservatezza, viene mantenuta anonima nell’elaborato
L'assetto urbanistico del territorio montano della Provincia di Brescia. Analisi tramite alcune significative elaborazioni demografiche
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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
Nature and Strength of Interlayer Binding in Graphite
No full textWe computed the inter-layer bonding properties of graphite using an ab-initio many body theory. We carried out variational and diffusion quantum Monte Carlo calculations and found an equilibrium inter-layer binding energy in good agreement with most recent experiments. We also analyzed the behavior of the total energy as a function of interlayer separation at large distances comparing the results with the predictions of the random phase approximation
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