1,720,957 research outputs found
Study of a BIPV adaptive system combining timber and photovoltaic technologies
No full textThe reduction in building energy consumption and CO2 emissions is one of the main goals in the nearly Zero Energy Buildings (nZEB) framework. In this regard, adaptive technologies and materials represent a constantly developing sector and source of innovation. Moreover, these systems are often aimed at collect and convert renewable energy (mainly solar) in order to cover as much as possible the building energy consumption.
In this context, the research goal has been the design of a BIPV (Building Integrated PhotoVoltaic) facade system able to change its curvature in relation to the external environmental conditions, orientating itself in order to optimize the energy production without the aid of any mechanical and electrical system. The following aspects have been considered: passive dynamism, lightness, weather resistance, easy maintenance, applicability on a large scale, easy integration in the building envelope, Life Cycle sustainability.
The adaptive layer consists of two wooden sheets, one active and one passive, joined together. The response of a hydromorphic material is a function of ΔMC’ (effective moisture content change), that is, the difference in the moisture content in the wood, which in turn depends on the air temperature and Relative Humidity (RH) and it varies in relation to the wood species. Moreover, this response is a function of the dimensional variations of the two wooden layers used to produce the composite self-adjusting flake. The variation in outdoor air RH activates the movement of the wooden flakes, that can therefore change their curvature thanks to the different expansion coefficients of the two wooden slats.
To evaluate the performance of the component, three shape configurations for the adaptive flakes have been assumed. For each hypothesis, the flakes have been modelled using the Rhinoceros 5 Software, according to the curvatures taken during the different months of the year. The Rhino models have been imported into Autodesk Ecotect Analysis to calculate the incident solar radiation and to study the self-shadowing effect in the various configurations (considering the climatic conditions of the city of Milano)
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Desired morphology in energy capture and storage advanced facades
No full textCurrent strategies for facades envelopes are determined by a static response defined by a single prescriptive value. This code requirement diminishes the ability of a facade to interact with the environment by constant readjustment of functional performance. This is the knowledge gap between present code compliant facades, based on measures in the reduction of thermal conduction to what could be.
The research proposes methods to demonstrate principle functions to capture and storage energy in facades that is derived by natural systems. It demonstrates nature’s characterization of materials by methods to control material assembly and functionality by hierarchical strategies that can be applied to envelope functionality. Nature generates materials with defined parameters to move neighbouring atoms within and between materials at a micrometer or nanometer levels. This interface reaction between different materials is driven by chemical composition and temperature with unprecedented levels of complexity and prevision. This is a thermal measurement system of precise modulation response as a dynamic reaction diffusion system. The question is, why is this characterization of function not emulated in envelope design?
The aim of the research is therefore to demonstrate how utilizing bio-inspired engineering aims would progress the knowledge gap in understanding, to advance energy capture and storage materials and to determine hierarchical rule based measures defined by steady state theory, in the control of solar heat load. The application to observe and quantify heat flow targeting theory will progress our understanding to derive proof of principle results. To embed natures approach
to advanced materials of energy capture and storage will ultimately lead to desired morphology in functional facades. This through a case studies approach.
Embarking on the biological solutions, the requirement of the maximizing the solar energy capture can be fulfilled by following the present and previously recognized natural strategies of heliotropism (following the sun, which could be observed e.g. in the sunflowers). The plans use a phytochrome, a photoreceptor pigment to detect light. Light-detection mechanism is utilized in long and shortrange behaviour regulation. It regulates the circadian rhythm as well as the seasonal rhythms like time of flowering and seeding. Leaf position is modified in the mechanism of stem elongation that is called phototropism: a chemical compound called auxin causes the plant cells to have an elongated shape on the further side form the light (this makes the stem bend towards the light)
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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