1,720,959 research outputs found
"BIBLIOTECA BRAIDENSE DI MILANO Rinforzo strutturale della volta con un sistema composito innovativo "
No full textL’intervento di restauro della volta della “Sala dei Manoscritti”, finanziato con appositi fondi del Ministero per i Beni e le Attività Culturali (Direzione Generale per i Beni Librari e gli Istituti Culturali), fu concepito principalmente a seguito della riapertura di dissesti statici, sicuramente di antica data, come poteva dedursi dai depositi di polveri dentro le fessure delle crepe, tornati ad evidenziarsi a seguito di opere condotte in prossimità delle cantine per la realizzazione di una nuova centrale termica interrrata, che causò, nella Sala in questione, distacco di piccoli brani di intonaco, vecchie sigillature e polvere. L’intervento si divise così in due fasi, strettamente correlate: una di consolidamento statico ed una di restauro dell’apparato decorativo; entrambe le fasi furono valutate in considerazione delle difficoltà di allestimento di qualsiasi cantiere in un sito così particolare sia sotto il profilo dell’utilizzo corrente, legato alla sua funzione, sia alla presenza di arredi di pregio e di ciò, ancor più di pregio, che in tali arredi era contenuto. Quindi la convivenza del cantiere con la funzione della biblioteca, evitando di conseguenza, di spostare arredi, libri, e documenti antichi, pur salvaguardandoli dalla presenza del cantiere stesso, fu uno dei principali problemi che venne posto sul piano operativo
Environmental-like exposure to estrogen during development affects Morris Water Maze performance in male rats. Program No. 879.9.
No full textDevelopmental exposure to xenoestrogen enhances spatial learning in male rats
No full textSteroid hormones have profound effects on the development and function of the nervous system. Environmental estrogens or xenoestrogens are manmade or are natural compounds, which mimics the action of estrogen hormones. The experimental evidence for impairment of cognitive functions in humans and mammals following exposure to xenoestrogens has been fiercely debated. The strongest arguments against such studies have been that the route, time course, and intensity of exposure did not simulate environmental exposure, and that the chemicals tested have additional, non-estrogenic toxic effects, hindering a generalization of actual "xenoestrogenic" effects. Here we show that an environmental-like exposure to the pure estrogen, 17 alpha-ethynylestradiol (EE2) during development enhances spatial learning abilities in adult male Sprague-Dawley rats. To simulate an environmental exposure, we used a very low dose (4 ng/kg/day) of EE2 equivalent to concentrations measured in European and US streams which was given orally with a non-invasive method, and we extended the treatment for the entire course of development, from conception to puberty. The animals were tested in a Morris water maze protocol at 6 months of age. Male rats treated with EE2 during development showed a faster learning during the training phase, and remembered better the position of the bidden platform in the short term. Our study demonstrates that actual levels of exposure to xenoestrogens can permanently alter cognitive abilities of a mammalian species. (c) 2007 Elsevier Inc. All rights reserved
Environmental-like treatment with a pure oestrogen affects Morris Water Maze (MWM) performance in male rats
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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
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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