1,721,002 research outputs found
Photo-realistic image synthesis in volume rendering for rapid prototyping and CAM applications (draft)
Full text linkThis document describes some preliminary results of the application of direct volume visualization and realistic image synthesis techniques in Computer Aided Manufacturing (CAM) field. The final goal is to analyze the use volume data representation and direct volume visualization techniques respectively as basic geometric element and rendering method for numerical control (NC) process planning and simulation. In particular we want to study their application in the process of human organs replication by rapid prototyping techniques. Volume rendering techniques will be used to evaluate the geometric reconstruction of volumetric data (e.g. parts of human body extracted from a CT scan as the carotid arteries), in order to obtain the best polygonal approximation of a dataset. The polygonal model resulting from this evaluation stage will be used to drive its physical reconstruction via rapid prototyping. A volume rendering program, called VolCastIA, is presented. VolCastIA is a software environment built to evaluate the use of state of the art image synthesis methods in the volume rendering context
Preliminary estimation of the receiver tube wall temperature and the performance of CSP plants in off design-conditions by means of a simplified dynamic model
No full textThis work deals with the development of a fast and robust simulation tool to preliminary estimate the receiver tube wall temperature and the performance of small-scale Linear Fresnel Reflectors (LFRs) solar fields. Under the assumption of uniform solar flux, the proposed 1 D dynamic model includes a more detailed heat transfer analysis between the fluid and the internal wall of the receiver tube by implementing effective correlations covering all the possible flow regimes. The model is then applied to assess the performance of a LFRs solar field developed under the EU funded project “Innova Microsolar” with varying ambient and operating conditions. Results show that: (i) the buoyancy driven flow enhances the heat transfer of about one order of magnitude compared to the assumption of a constant Nusselt number in laminar flow condition; (ii) it is possible to correlate with more than 95% of confidence over the entire range the receiver tube wall temperature to a newly defined parameter called Load Temperature which is based on input data provided by sensors usually installed in these kind of plants; (iii) the proposed model improves also the estimation of the collected thermal energy by the fluid in the receiver tube during the warm-up phase of about 0.8% compared to the reference Forristall model
Effetti della subsidenza e uso del territorio nell'area della vecchia miniera di Serbariu (Carbonia
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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
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