1,721,204 research outputs found
Polyphenols from apple skins: A study on microwave-assisted extraction optimization and exhausted solid characterization
No full textApple processing industry can be improved by the valorization of its residues. Apple skins could be used for the recovery of high added value compounds for the formulation of new antioxidant products (dietary supplements, cosmetics, drugs). In this study, apple skins from Jonagold cultivar were selected as raw material for an optimization study on microwave-assisted process parameters, using green solvents and an inert atmosphere combined to hard operating conditions (long time and high temperature), with the aim to enhance the mass transfer in the extraction process without significant loss in biomolecule activity. Response surface modeling was employed for the experimental planning and multi-variable process optimization. The effect of time, temperature and solvent composition on extraction performances and exhausted solid elemental composition were evaluated. The extract obtained after optimization showed very high extraction yields (50.4 mggallic acid equivalents/gdry biomass; 13.9 mgcatechin equivalents/gdry biomass) and remarkable antiradical properties. Moreover, after the extraction the solid residue exhibited higher carbon content (52.7%) and calorific value (24.6 MJ/kg) than the untreated apple skins
Transcultural differences in the perception of life events
No full textThe perception of life events of Italian and English subjects was compared. Psychiatric patients and relatives rated 58 life events according to the degree to which the event was regarded as upsetting. The similarity between the two groups was noted, although Italian subjects tended to rate events as less upsetting than the English. The findings excluded that the rating differences between the two groups reflected differences in reaction to life and confirmed the existence of scaling similarity over national groups
Measuring and Managing Customer Lifetime Value: A CLV Scorecard and Cohort Analysis in a Subscription-based Enterprise
No full textCOMPANIES FREQUENTLY ENCOUNTER DIFFICULTY MEASURING CUSTOMER LIFETIME
VALUE (CLV) AND CUSTOMER EQUITY (CE) BECAUSE OF THE LACK OF A PRACTICAL
FRAMEWORK AND THE ANALYTICAL CHALLENGES BEHIND THE CLV PARADIGM.
THIS ARTICLE PROPOSES STEP-BY-STEP GUIDELINES TO MEASURE AND MANAGE CLV IN A
SUBSCRIPTION-BASED ENTERPRISE (SBE). A CASE STUDY DEMONSTRATES HOW A
CLV SCORECARD AND COHORT ANALYSIS ARE PRACTICAL TOOLS THAT CAN
SUPPORT DECISION MAKING
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
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