1,720,991 research outputs found
The school of "Bornaccino" and the teacher Federico Moroni
No full textPupils of the primary school in Bornaccino, a small village near Santarcangelo di Romagna, used drawings to narrate their daily lives, the rural world they had known since infancy. Their teacher Federico Moroni tried to stimulate their imagination and raise their awareness of feeling emotions, because through these they would be able to express their everyday experiences in a more direct, spontaneous manner, also through drawings and in the use of colour. The teacher’s work covered a period of around twenty years, and the most important educational aspect was that of linking education to creativity, seen most clearly in art education and understood as the free expression of every child’s subjectivity, strongly convinced that a creative person is able to adapt more flexibly to change, to establish new relations which adapt to changing situations, and to find new strategies and solutions using greater flexibility
Introduzione a: ... e giù. in fondo, il mare. Un viaggio di Federico Moroni e Tonino Guerra
No full textAb initio study on the crystallographic solvation pattern of the cytosine-guanine base pair in DNA
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Stabilization of the Noncomplementary Guanine-Adenine Base Pairs by Zn(II) Ions. An ab Initio SCF-MI Study
No full textThe structure and energy of the guanine (G)-adenine (A) base pairs in the G(anti)-A(anti) and G(anti)-
A(syn) conformations as well as their complexes with hydrated zinc(II) ions have been investigated by the
self-consistent field for molecular interaction (SCF-MI) ab initio method. The formation of covalent bonds
between the Zn(II) ions and the N7 sites of the guanine bases results in an increase of the binding energy of
the G-A pairs. In addition, the SCF-MI calculations have also been performed for the guanine (G)-guanine
(G)-cytosine (C) (G-GC) base triplet and for its complex with a hydrated Zn(II) ion bound to the N7 site
of the third-strand guanine. The Zn(II) binding causes a significant stabilization of the G-GC triplet. Possible
implications for the conformational changes in alternating d(GA)n sequences are discussed
The structure of lithium and potassium cations coordinated by ammonia molecules in the gas phase as revealed by ab initio SCF-MI calculations
No full textThe structure and the energetics of lithium and potassium cations coordinated by ammonia molecules were calculated by an ab initio Hartree Fock study in the absence of basis set superposition error (BSSE). Complexes formed by clusters consisting of up to six ammonia molecules and Li+ or K+ ions were investigated. Gradient geometry optimizations were performed in the framework of the self consistent field for molecular interactions (SCF-MI) theory adopting the recently implemented generalization of the method. The intermolecular interaction energies and PES are a priori corrected for the BSSE. The 6-31+G∗ basis set was used. Ion clusters are stabilized by the metal-N bond and the interaction structure allows the formation of the maximum number of such bonds in the first solvation shell. All the properties studied change in a systematic manner upon addition of a further ammonia molecule. Li+ and K+ complexes exhibit no sign of hydrogen bonding between the molecules of the first coordination shell. However, the Li+ complexes with five and six ammonia molecules show the formation of hydrogen bonds between the coordinated molecules of first and second shells. From the results, it follows that both Li+ and K+ ions form similar complexes with up to four ammonia molecules. However, in the Li+ complexes, the first coordination shell saturates with four molecules and leads to conformations differing from those of the K+ complexes. In accordance with recent neutron diffraction experimental analysis of the structure of Li+ and K+ in NH3 solutions [J. Chem. Phys. 112 (2000) 7147], the lithium is tetrahedrally coordinated while potassium results octahedrally coordinated by solvent molecules. The theoretical results are acceptably consistent with the experiments and can furnish insight into the identification of some features of the clustering process
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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