1,721,780 research outputs found
Dosaggio sierico di vitamina B12 in corso di sviluppo di tumore ascite trapiantabile di Yoshida
No full textClues from defect photochemistry
No full textThe efficiency of a solar cell is intimately
related to the fate of photogenerated
electron–hole pairs in the absorber
layer. The interaction and capture of
charge carriers through defects acting as
recombination centres may significantly
limit the solar cell’s open-circuit voltage and
thus depress its overall performance.
The efficient charge generation and
collection in devices based on lead-halide
perovskites are, to a first approximation,
related to the extremely long lifetimes of
photogenerated carriers
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
Bio-production of natural phytostimulants and their application under abiotic stress conditions
No full textDeveloping circularity processes in every production chain is an important objective of the
new economy and in plants propagation the use of waste and by-products is particularly
interesting.
Temporary Immersion Bioreactors (TIBs) technology is used for mass propagation in
different plant species being a controlled in vitro system that allows to obtain genetically
similar and pathogens-free material with a higher yield, a high quality production and a
reduced impact on the environment. During the propagation in TIBs, the liquid culture
medium can be enriched with metabolites produced by the plant and that makes it a useful
waste product for other purposes, such as use in agriculture as a plant biostimulant.
The aim of this research was to evaluate the phytostimulant effect of water and culture media
from the propagation in temporary immersion bioreactors of aquatic mosses whose
biomass, once increased, has other biotechnological uses. Initially, in vitro assays were
carried out on tobacco model plants under normal conditions and under abiotic stress
observing how, especially in salt stress, the response of plant, in terms of growth, was better,
even compared to the non-stressed control. Successively, a phenomic study was carried
out at High-throughput plant phenotyping platform placed at the ALSIA Centro Ricerche
Metapontum Agrobios s.r.l. where, these by-products of moss micropropagation, were
tested on tomato to study plant growth, performance, and composition based on multi-
spectrum, high-throughput image analysis to detect morphometric and physiological
parameters in addition to traditional measurement methods
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
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