1,721,003 research outputs found
Study on the structure and properties of wool keratin regenerated from formic acid
No full text: Structural characteristics of keratin regenerated from water (KW) and from formic (KF) acid solutions were compared. Amino acid composition and molecular weight distribution of KW and KF samples were studied by high performance liquid chromatography (HPLC) and SDS-PAGE electrophoresis. Turbidity measurement showed that keratin dissolved in formic acid forms transparent and stable solutions and no flocculation occurs. In addition, because of its good solvation properties, studied by viscosity measurements, formic acid can be used as a co-solvent to prepare keratin-based blend solutions. Structural studies carried out by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and near infrared (NIR) suggest that formic acid stabilizes the beta-sheet structure. Thermogravimetric analysis (TGA) reveals a higher thermal stability of keratin regenerated from formic acid with respect to keratin regenerated from water
«Antonius Maximus Monachorum». Testi e immagini di Antonio eremita nel Basso Medioevo
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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
Morte e rinascita dei manoscritti ebraici: il loro riuso come legature e la loro recente riscoperta
No full textThis article examines the death and rebirth of the Hebrew manuscripts, and their reuse as book bindings and recent rediscovery.
Without doubt, Italy is the country in which the largest number of Hebrew fragments of Medieval manuscripts is conserved, thanks to the central role that Italy played in Europe’s cultural development and the production and diffusion of the book between the late Middle Ages and the Renaissance.
The recovery of these relics, in a way, gives new life to manuscripts that by now have been “dead” as books for four or five centuries. In recovering these manuscripts, one is entering into the history of the Hebrew book manuscript; retracing its back-story, closely related to that of the people that produced it; following its mobility; examining the methods and the forms in which it was conserved; and examining that which can be defined as its “death,” which consisted either of (1) its ritual placement in a genizah and successive burial, a ritual form of destruction to avoid desecration; (2) destruction by means of the book burnings of the Church that sadly accompanied the Church’s two-millennia-long prosecution of the Jews; or (3) its recycling, as in our case.
Slightly more than 70,000 Hebrew book manuscripts have reached us to the present, conserved in about 600 national, state, public, municipal, university and monastic libraries, as well as in private collections. In addition to these, about 150,000 fragments of medieval manuscripts were recovered from the genizah of Cairo, which consisted of a depository in the Ben Ezra synagogue in old Cairo. However, between the manuscripts of Qumran, discovered beginning in 1947 and dated between the second century B.C.E. and the first century C.E., and the oldest medieval manuscript in our possession, we have a near total gap in documentation of 800 years. In fact, the oldest dated manuscript in our possession was copied in the years 903-904 in Islamic lands.
This quantity of surviving medieval Hebrew books surely represents only a small fraction of the entire literary production of the Jews, which would have been much larger than that of the Christians, proportionate to the fact that the Jews constituted a minority, as Jews were taught to read and write from a young age. From time immemorial, almost all Jews, especially males, knew how to read and write. The period of the Hebrew manuscript continued until 1540, at which point the printing press was nearly capable of supplying the majority of written works. For this period of about 650 years, one calculates that around 40,000 or 50,000 Hebrew book manuscripts should have reached us, in addition to the already-mentioned fragments of the Cairo Genizah. According to an approximate calculation of Colette Sirat, one of the greatest scholars of the Hebrew book, no more than 5% of all the manuscripts produced in Europe by Jews during the Middle Ages have reached us.
In light of these considerations, the discovery of even one fragment or a single page of a new medieval Hebrew manuscript is of noteworthy importance. In this sense, the census and cataloguing of the folios, bifolios and fragments of medieval Hebrew codices discovered as bindings of registers and printed books in the Italian and European archives is of great importance, as tens of thousands of fragments have been recovered. Of these, the majority was discovered in Italian archives, where we recovered, as was mentioned above, about 10,000 such fragments
L'assedio arabo di Costantinopoli del 654 in una pseudo-Apocalisse del profeta Daniele poco nota
No full textSulla base di una fonte finora inutilizzata, tratta a un codice astrologico, l'A. propone una datazione della battaglia degli "Alberi" e conferma la tradizione armena di Sebeos circa un assedio arabo a Costantinopoli nel 654
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