1,720,979 research outputs found
Post-intubation tracheal stenoses: what is the curative yield of the interventional pulmonology procedures?
No full textAn Extended Force Density Method for the Prestress Design of Cable Systems with new forms
No full textThe Force Density Method (FDM) is an extremely versatile tool in form finding problems concerning nets of cables. In this paper an Extended Force Density Method (EFDM), suitable to
deal both with nets of cables only and with cable-strut assemblies, is presented.
A usual tool to study these type of cable structures as well as to find the form of tensegrity structures, is the Singular Value Decomposition (SVD) of the equilibrium matrix. This technique, however, has some limitations. First of all, the searching for the eigenvalues, in some cases, must be forced, setting to zero the lower ones, secondly, the SVD may lead to sets of eigenvectors, not physically consistent with the mechanic of the mixed structures, having
tensioned cables and compressed struts. Moreover, the geometry of the structure must be given a priori. The EFDM is proposed here as an alternative approach to the SVD. The efficiency and
the robustness of method is assessed through comparisons with other form finding techniques in dealing with characteristic applications to the prestress design of cable systems. As a further extension, the EFDM is applied to structures having some parts not yet geometrically defined, as can happen in designing new creative forms
An Extended Force Density Method for the form finding of cable systems with new forms
No full textThe Force Density Method (FDM) is an extremely versatile tool in form finding problems concerning nets of cables. In this paper an Extended Force Density Method (EFDM), suitable to deal both with nets of cables only and with cable-strut assemblies, is presented. A usual tool to study these type of cable structures as well as to find the form of tensegrity structures, is the Singular Value Decomposition (SVD) of the equilibrium matrix. This technique, however, has some limitations. First of all, the searching for the eigenvalues, in some cases, must be forced, setting to zero the lower ones, secondly, the SVD may lead to sets of eigenvectors, not physically consistent with the mechanic of the mixed structures, having tensioned cables and compressed struts. Moreover, the geometry of the structure must be given a priori. The EFDM is proposed here as an alternative approach to the SVD. The efficiency and the robustness of method is assessed through comparisons with other form finding techniques in dealing with characteristic applications to the prestress design of cable systems. As a further extension, the EFDM is applied to structures having some parts not yet geometrically defined, as can happen in designing new creative forms
Inflammatory Myofibroblastic Tumour Of The Trachea
No full textWe present a case of inflammatory myofibroblastic tumour (IMT) of the trachea arising in a young woman. The patient presented with acute upper airway obstruction, dyspnoea and cough. At videobronchoscopy, the lesion appeared as a smooth, pink, polipoid mass of 1,5 cm obstructing the 70% of the tracheal lumen. The mass was endoscopically removed.
Histopathologic examination revealed a lesion composed of spindle shaped cells admixed with a prominent inflammatory infiltrate, which included hystiocytes, plasma cells and lymphocytes. Immunohistochemical studies revealed that the spindle cells were reactive with anti-vimentin, while cytokeratin, S-100, smooth muscle actin, CD21, CD23, CD34 and CD31 were all consistently negative. The proliferative index, shown by Ki67 antibody, was about 7% . Two years after diagnosis , the patient is well without evidence of disease. IMT of the respiratory tract occurs more frequently in the lung. To the best of our knowledge there are only 2 previously reported cases of tracheal IMT. This type of lesion, has to be differentiated from malignant neoplasms such as spindle cell carcinoma and fibrosarcom
Geochemical survey of an illegal waste disposal site under a waste emergency scenario (Northwest Naples, Italy)
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
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