1,721,840 research outputs found
High voltage stability and cleaning of 2 m2 resistive strip micromegas detectors (SM2) for the upgrade of the forward muon spectrometer of the ATLAS experiment
No full textFor the upgrade of the innermost station of the forward muon spectrometer of the ATLAS experiment large Micromegas (MM) detectors of 2 and 3 m with 4 active layers each are foreseen. Four types of MM chambers are produced among four sites. Each sites has to deliver 32 quadruplets or 128 active planes. The tiny 120μm distance between the 600 V resistive strip anodes and the ground micro-meshes for these large areas require adequate and well adapted cleaning procedures to guarantee high voltage stability. This is particularly critical for strip shaped surfaces made from resistive material where remnants from the lithographic production processes must be completely removed. The procedure foreseen a visual inspections to be carried on during cleaning and assembly procedures; a wet cleaning procedure to remove dust and possible ionic components of salts from the anode surfaces; a dry cleaning procedure to remove dust; HV tests to be done to validate the cleaning. The cleaning procedure will be illustrated for a New Small Wheel (NSW) Outer Small Module (SM2) of 2 m
Enhancing Heat Exchanger Performance: Integrating Computational Modeling and Experimental Studies for Optimization Approaches
No full textOne significant challenge continually encountered by manufacturers of heat exchangers is the imperative for a design approach grounded in technological innovation aimed at producing devices that are not only more thermally efficient, but also feature reduced pressure drop, volume, manufacturing and operational costs and high-quality surface finishing to mitigate fouling phenomena [1].
A strategy that has been successfully explored in literature to achieve this goal consists in the use of emerging additive manufacturing technologies, that enable to produce surfaces with an optimized morphology [2]. This challenge requires a multidisciplinary approach that couples the advantages of numerical approaches to experimental advanced measurement and data processing procedures, mostly based on highly resolved infrared thermographic systems [3]. The possibility of obtaining detailed information about the heat transfer capability of enhanced surfaces can be suitably achieved by using numerical tools in the optimization problem that adopts experimental data as a necessary either input or validation elements [4].
The present contribution aims at presenting some applications of the two complementary approaches (numerical and experimental) with regards to heat transfer enhancement passive solutions implemented in heat exchangers
Nonlinear Convection-Dispersion Models with a Distributed Pollutant Source I - Direct Initial Boundary Value Problems
No full textConstruction techniques and performances of a full-size prototype Micromegas chamber for the ATLAS muon spectrometer upgrade
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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
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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