1,721,228 research outputs found
Fogazzaro A.-Murri R., Carteggio (1905-1909). A cura di P. Marangon, Accademia Olimpica, Vicenza 2004
No full textRecensione al volume: Fogazzaro A.-Murri R., Carteggio (1905-1909). A cura di P. Marangon, Accademia Olimpica, Vicenza 200
Matrix integrals and Feynman diagrams in the Kontsevich model
No full textWe review some relations occurring between the combinatorial intersection theory on the moduli spaces of stable curves and the asymptotic behavior of the 't Hooft-Kontsevich matrix integrals. In particular, we give an alternative proof of the Witten-Di Francesco-Itzykson-
Zuber theorem |which expresses derivatives of the partition function of intersection numbers as matrix integrals| using techniques based on diagrammatic calculus and combinatorial relations among intersection numbers. These techniques extend to a more general interaction potential
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
A grid execution model for computational chemistry applications using the GC3Pie framework and AppPot
No full textPorting and running of computational chemistry applications on distributed systems have been performed for a set of quantum mechanics scattering programs within a collaboration between the Grid Computing Competence Centre (Zurich), the Computational Dynamics and Kinetics Group (Perugia) and the Italian Grid Infrastructure (Bologna). For this purpose the high throughput execution framework GC3Pie and the AppPot cloud/grid virtual machines have been used to implement a grid based workflow dealing with the central blocks of an ab initio Molecular simulator. These blocks carry out both the fitting of the potential energy values computed using ab initio methods and the evaluation of some atom diatom quantum reactive scattering properties. Related performances are discussed and compared with other approaches
THE DENSITY OF STATES IN THE MOBILITY GAP OF A-SI1-X GEX FILMS
No full textThe density of states distribution (DOS) in the mobility gap of undoped glow-discharge a-Si1-x Ge(x):H alloy films was determined by means of field effect tecnique. The specimens were grown at different percentages of Ge. The DOS of the films shows a behaviour related to the content of germanium and it is independent of the presence of additional hydrogen in discharge
Effects of the dopants on the electrical conductivity and Hall mobility in Si:H,Cl films
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