1,720,969 research outputs found
Sospensioni colloidali per la conversione del calore di scarto in energia elettrica
Full text linkOgni processo reale di trasformazione dell’energia comporta un’efficienza non unitaria e la concorrente generazione di calore di scarto che può essere stoccato e riconvertito, diventando quindi un’opportunità economica. L’approccio innovativo che abbiamo messo a punto si basa sull'intuizione che sospensioni colloidali possono essere messe in movimento da convezione ed avvezione termomagnetica, per rilasciare o indurre una carica elettrica con ottimi livelli di efficienza elettrocinetica. Abbiamo confrontato tre fenomeni fisici di conversione: l’induzione elettromagnetica (colloide a base di magnetite), l’effetto piroelettrico (titanato di bario) e quello triboelettrico (titania), arrivando a valutarne le rispettive potenzialità nei processi di conversione
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
Multiphysics‐Enabled Liquid State Thermal Harvesting: Synergistic Effects between Pyroelectricity and Triboelectrification
Full text linkEnergy consumption levels show a never-ending increase since the industrial era. Toward sustainability objectives, it is of outstanding importance to reduce the amount of wasted energy, that typically comes as waste heat, as a consequence of nonunitary efficiency of any thermodynamic process. Herein, a breakthrough in conversion of low enthalpy heat into electricity is presented, based on a liquid state device that operates through multiphysics effects: thermomagnetic advection, triboelectricity, pyroelectricity, and Ludwig–Sorét effect. A synergistic interaction between ferroelectric surfaces and a complex composition colloidal suspension is evidenced, owing to an enhancement of the generated potential of 365% in comparison with pyroelectric effect and 267% in comparison with triboelectric effect, while the current extracted is 54% higher than the pyroelectric effect only and the power extracted by induction remains substantially unperturbed. The impact of this technology on society is also analyzed, on the basis of a set of practical applications, by means of a computational analysis
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
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
Waste heat to power by means of a thermomagnetic colloidal energy harvester
Full text linkEnergy utilization, sustainability and care for the environment are now under the spotlight; dealing with energy must take into account the non-unitary efficiency of any thermodynamic process and the consequent production of waste heat, playing a crucial role in global warming. A valuable approach to tackle this problem is to capture and reuse the waste heat, providing an attractive opportunity for an emission-free and cost-effective energy resource. Waste heat to power is the process of converting the heat discarded in electricity, via thermodynamic cycles, thermoelectric materials, pyroelectric materials. Here, a new ThermOmagnetic hydRODYNAmic energy harvester (TORODYNA) exploiting a commercial ferrofluid, is presented. The lab-scale prototype has a toroidal geometry adopted from the well-known tokamak reactor. Peltier modules are used to generate the thermal gradient between the two sides of the reactor, that combined with the effect of permanent magnets trigger the advection. To extract and ensure the output electrical energy, the structure is wrapped-up with coils and connected to an impedance and pico-amperometer. Two coil configurations (purely poloidal and mixed poloidal/toroidal windings) are tested, in a heterogeneous water-ferrofluid two-phase flow, reaching a maximum extracted electrical power of 10.4 μW/K from a thermal gradient of 10 K, which is approximately 20% of the ideal Carnot efficiency of a thermal machine working in the same temperature drop. Furthermore, numerical analysis of the system has been performed developing a FortranTM code in an Eulerian framework, using Galerkin approximation and harmonic functions
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