1,721,039 research outputs found
Addome acuto
No full textE' una condizione clinica aspecifica caratterizzata dalla presenza di dolore addominale generalmente intenso associato a contrattura della muscolatura della parete addominale come reazione di difesa (addome non trattabile).
Si tende a considerare “addome acuto” qualunque quadro patologico caratterizzato da dolore addominale insorto recentemente e ingravescente, la cui eziologia sia ancora da precisare. In ogni modo la condizione di addome acuto richiede sempre un’attenzione particolare, indipendentemente dall’intensità del quadro clinico, e spesso un intervento chirurgico immediato perchè gravata da un’elevata mortalità.
Non bisogna confondere l’addome acuto con la peritonite (vedi capitolo 15); benchè nella maggioranza dei casi l’emergenza addome acuto sia imputabile alla sottostante presenza di peritonite, spesso accade che la causa dell’addome acuto sia di altro tipo e che non necessiti nemmeno un trattamento chirurgico
Ab Initio Simulation of Optical Limiting: The Case of Metal-Free Phthalocyanine
Full text linkWe present a fully ab initio, nonperturbative description of the optical limiting properties of a metal-free phthalocyanine by simulating the effects of a broadband electric field of increasing intensity. The results confirm reverse saturable absorption as the leading mechanism for optical limiting phenomena in this system and reveal that a number of dipole-forbidden excitations are populated by excited-state absorption at more intense external fields. The excellent agreement with the experimental data supports our approach as a powerful tool to predict optical limiting in view of applications
Publisher's Note: Optical properties of graphene nanoribbons: The role of many-body effects (Physical Review B - Condensed Matter and Materials Physics (2008) 77, (041404))
No full text
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
Effect of portal blood arterialization with a new extracorporeal device (L.E.O.NARDO) in a model of toxic acute liver failure
No full textSuccessful treatment of acute liver failure induced with an extended hepatectomy by portal vein arterialization in the steatotic rat
No full textInverted Conformation Stability of a Motor Molecule on a Metal Surface
Full text linkMolecular motors have been intensely studied in solution, but less commonly on solid surfaces that offer fixed points of reference for their motion and allow high-resolution single-molecule imaging by scanning probe microscopy. Surface adsorption of molecules can also alter the potential energy surface and consequently preferred intramolecular conformations, but it is unknown how this affects motor molecules. Here, we show how the different conformations of motor molecules are modified by surface adsorption using a combination of scanning tunneling microscopy and density functional theory. These results demonstrate how the contact of a motor molecule with a solid can affect the energetics of the molecular conformations
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