1,721,016 research outputs found
Clinical course of ulcerative colitis
No full text. Dig Liver Dis. 2008 Jul;40 Suppl 2:S247-52.
Clinical course of ulcerative colitis.
Cottone M, Scimeca D, Mocciaro F, Civitavecchia G, Perricone G, Orlando A.
Department of Medicine, Pneumology and Nutrition Clinic, V. Cervello Hospital,
University of Palermo, Palermo, Italy.
AIM: To provide a review of studies on prognosis in ulcerative colitis by
reviewing the relevant population-based cohort studies. On the basis of incidence
and population studies, ulcerative colitis has a favourable clinical course, with
good quality of life, a chronic course characterized by at least one relapse, and
a surgery rate of 30% after 10 years from diagnosis. Patients affected by severe
ulcerative colitis have a higher risk of colectomy, and some clinical variables
may predict the disease's clinical course. Most patients respond to steroids and
only a low percentage become dependent, or non-responders to steroids. Patients
who have a long-lasting ulcerative colitis (>10 years) or are affected by an
extensive disease have an increased risk of developing colorectal cancer, while
those treated with immunosuppressants for long period of time may have an
increased risk of developing lymphomas. Data on mortality in ulcerative colitis
patients are not homogeneous, but if a real risk exists it is in patients with
extensive or severe disease. The evidence that patients with severe ulcerative
colitis are often non-smokers may explain why in one study the mortality rate was
lower
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
Influence of Microstructure on the Mechanical Properties of Thixomolded® Magnesium Alloys
No full textThixomolding® processes of magnesium have been highlighted in research and applications
in the last decade. While in the past its use was mainly driven by consumer goods and electronic applications
by Asian manufacturers such as notebook computer cases, digital camera bodies, chain saw housings,
etc., currently Thixomolding® has been widely extended to other applications. Some examples are in
automotive and sports equipment, such as automotive shift cams, bicycle saddles, fishing reels, snowboard
bindings, etc. Wider applications of Thixomolding® magnesium alloys mainly depend on various advantages
such as a simple and completely automatic manufacturing process, high productivity, and repeatability
of the mechanical properties of parts. Moreover, due to low molding temperatures and laminar flow of the
semisolid injected material, longer die life and dimensional precision are expected. In addition, complex
geometry and net shape forming are possible, thus avoiding any further machining. Finally, residual porosity,
which is one of the typical defects of cast parts due to gas entrapment in turbulent flow, is avoided
because of the laminar flow injection molding in tool-die. In this work, the thixomolded AZ91D and AM60B
alloys have been investigated. A complete analysis has been conducted on the as-supplied material, by
investigating the microstructure, tensile properties and axial fatigue fatigue ratio R0.1 performance. To
improve mechanical characteristics, the Tx heat treatment has been performed on the thixomolded material
and its effect on the microstructure has been analyzed and documented as a partial dissolution of brittle
-Mg17Al12 phase. The effect of heat treatment on mechanical properties of the material has been investigated
and documented including the evaluation of a toughness index
Thixomolded Magnesium alloys: strategic product innovation in automobiles
No full textThe research on magnesium alloys
for structural lightweight applications
is today at an embryonic stage,
but these alloys offer great potential.
Thixomolding of magnesium alloys for
automotive applications is promising
since the process can be used to manufacture
net-shape parts cost-effectively
and with high reliability and repeatability
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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