1,721,073 research outputs found
L∞ liftings of semiregularity maps via Chern–Simons classes
Full text linkWe introduce the notion of Chern–Simons classes for curved DG-pairs and we prove that a particular case of this general construction provides canonical L∞ liftings of Buchweitz–Flenner semiregularity maps for coherent sheaves on complex manifolds
Connections and L∞ liftings of semiregularity maps
Full text linkLet E⁎ be a finite complex of locally free sheaves on a complex manifold X. We prove that to every connection of type (1,0) on E⁎ it is canonically associated an L∞ morphism [Formula presented] that lifts the 1-component of the Buchweitz-Flenner semiregularity map. An application to deformations of coherent sheaves on projective manifolds is given
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
Left-sided congestive heart failure in a dog with intraventricular rhabdomyosarcoma
No full textCASE REPORT A 9-year-old female Labrador Retriever was referred for evaluation of a 7-day history of exercise intolerance and dyspnoea. Thoracic radiographs showed moderate left atrial enlargement and severe pulmonary oedema. Transthoracic echocardiography revealed a heterogeneous hyperechoic mass extending from the left inflow tract to the outflow tract and protruding through the aortic ostium during systole. Spectral Doppler echocardiography was consistent with left ventricular inflow and outflow tract obstruction secondary to the mass. Because of the lack of response to treatment and the poor prognosis, the dog was euthanased and necropsy was performed. A large intracavitary mass, originating from the left ventricular free wall, filled the ventricular cavity. Mitral leaflets were distorted and thickened with shortened chordae. Microscopic findings were consistent with a rhabdomyosarcoma. CONCLUSION This report describes an intracavitary left ventricular rhabdomyosarcoma in a dog, causing left ventricle outflow tract obstruction and functional mitral stenosis that was clinically associated with pulmonary oedema
Congenital heart defects in cattle
No full textCongenital heart defects (CHD) are cardiac diseases present at birth and a prevalence of 0.2% to 2.7% has been reported in cattle. How-ever, the real prevalence of bovine CHD could be underestimated because of the scarcity of surveillance programs and the low economical value of young animals, this leads the farmers to limit further diagnostic tests in calves suspected to have CHD. Moreover, many calves can have asymptomatic CHD that go undetected or die during the perinatal period before veterinary examination. The precise cause of CHD is not known in cattle and external teratogens or genetic factors can be implicated in the genesis of CHD. The use of selected sires for intensive breeding programs, especially in some of breeds with low population size, has increased the “inbreeding grade” that could be responsible for CHD. Congenital cardiac defects can be classified by various criteria and, in relation to the presence of cyanosis of the mucous membranes, they can be subdivided into cyanogenic or non-cyanogenic CHD. Ventricular septal defects, atrial septal defects and persistent ductus arteriosus are the most frequently reported non-cyanogenic CHD in cattle. Complex CHD such as conotrun-cal anomalies (tetralogy of Fallot, complete transposition of the great arteries and double-outlet right ventricle) are commonly described as cyanogenic CHD. Rare CHD such as malformations of atrioventricular valves, outflow tract obstructions and anomalies of vessels connected to the heart are less frequently diagnosed in the bovine species. This review aims to provide a summary of the most com-mon CHD reported in cattle with the iconographic support from the authors’ experience, offering thus an overview of which congenital anomalies should be considered during the evaluation of cattle suspected to have CHD. A precise diagnosis can be useful in cases with isolated defects, which can be associated with a favorable prognosis; likewise, it can be important an accurate and early diagnosis in cases with severe and complex malformations, often associated with a poor prognosis for long-term productivity and survival. This is of primary importance in order to avoid unnecessary treatments or animal suffering
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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