1,720,973 research outputs found
Alcune considerazioni sulla valutazione dell'incertezza nelle misure con anemometro a filo caldo
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Un sistema di misura per lo studio del flusso nei ventilatori centrifughi con sonde ad alta risposta in frequenza
No full textThis paper describes the measuring technique developed at the Department of Mechanical Engineering of the University of Cagliari for three-dimensional flow analysis applied to industrial-type centrifugal fans, using aerodynamic and high-frequency response probes. Experimental methodologies, hardware and data acquisition systems are described in detail with particular emphasis on hot-wire techniques
Sistemi per la Produzione Integrata di Energia Elettrica ed Idrogeno da Fonte Rinnovabile
No full textStudy addressing the performance of an electrochromic envelope in an office building in the Mediterranean climate
No full textThe paper analyzes the performance of electrochromic glazing that are at variable transparency; at the time, they are the more interesting components for the realization of the architectural contemporary envelope. They allow a good transparency and a large shield to solar radiation. The paper summarizes the first phase of a research project conducted by the Department of Architecture, University of Cagliari, which aims to explore the use of these materials through a simulation with appropriate computer codes. We have simulated the performances of the use of electrochromic glazing, in terms of optical and energy, in an office building in Cagliari. The innovative nature of the work is to use a computer code that operates under dynamic mode and also to assess the economic feasibility of a redevelopment of a glass envelope
Measurements of primary and secondary flows in an industrial forward-curved centrifugal fan
No full textAn industrial-type centrifugal-flow fan was instrumented and tested in order to obtain a fully-detailed relative flow pattern at impeller discharge. Testing entailed investigation of both primary flows (jet-wake pattern and presence of return flows) and secondary flows (due to streamwise vorticity either from meridional curvature or rotation effects). In addition to conventional probing, a crossed hot-wire probe was employed in the tests. Ensemble-averaging the hot-wire signals made it possible to obtain the three-dimensional phase-averaged relative flow pattern at discharge by means of double positioning of the probe. Results show secondary-flow effects of appreciable magnitude interacting with primary flows (e. g. , return flow in the hub region and variations in vortex structure and wake position with variations in flowrate
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
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