1,720,982 research outputs found
Preliminary Analysis about the Possibility to Adopt Special Assemblies with Minor Actinides in the LBE-Cooled XADS Core ENEA Contribution to Deliverable 72
No full textThe potentially large subcriticality margin of an ADS should allow the introduction of very significant quantities of waste products such as Minor Actinides and Long-Life Fission Products, which generally have a negative impact on the safety of a critical core. The present work is inserted in the framework of the XADS project. This document analyses, by means of deterministic methods (special procedures MECONG that make use of some ERANOS modules), the LBE-cooled XADS core completely loaded with special elements, which contain a great quantity of minor actinides. The material composition of the special element (pratically a U-free oxide fuel inserted in a Magnesium-Oxide matrix) has been provided by C.E.A. and it is the same that has been used in He-cooled XADS. With a 930-day fuel cycle and for a 20-cycle multi-recycling, three power levels are investigated: 80, 200 and 400 MWth. For each power level considered, the time evolution of some neutronic characteristics are analysed like the reactivity variation cycle by cycle and per day, the neutron spectrum, the maximum and average burn-up, inner and outer core flux, the enrichment at beginnig of life. The most important aspect highlighted, is to verify the capability of this subcritical system to burn plutonium and transmute minor actinides for each cycle and consequently the quantity of plutonium and of minor actinides that is necessary to supply at beginning of each cycle to restore the initial reactivity level. Different power levels for the most important neutronic parameters are compared, above all concerning the transmutation and the burn-up rate
Core Flexibility/Convertibility Proposal for Design Options of LBE-Cooled XADS
No full textThis document, which is a contractual deliverable of the PDS-XADS project identified with the number 72, deals with the preliminary analysis oriented to investigate the transmutation capability of the XADS care charged with innovative composite U-free oxide fuels characterized by a large content of minor actinides. The calculations were performed by means of a special procedure MECONG that makes use of some ERANOS modules. The fuel composition was provided by CEA and it is the same that was used far He-cooled XADS analyses. For each care attention was focused on the trend of the reactivity, minor actinides transmutation rate and plutonium bum-up rate in each cyc1e of 930 days and during the multi-recycling. The preliminary results of this study show that there is a good compromise between care and transmutation performances far a XADS care having a power ranging between 200 MWth and 400 MWth
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
Attachmet to God, attachment to parents/peers, and religious attitude among Italian adolescents
No full textMany contributions of the literature describing the relationship that a Catholic believer has with God refer to Bowlby's attachment theory. In this perspective, the main characteristics of the styles of attachment to parents and peers may recur in relationship with God. This study examined the relationship between parent/peer attachment, attacchment to God and religious attitude in a sample of 992 Italian adolescents. The data provide evidence for a positive relationship between attachment to God, to parents, and religious attitude. Analyses found parent/peer attachment and friendship quality as predictors than God attachment. The findings of this study tend to confirm the hypothesis that the relationship with God is influenced by attachment styles with parents and peers. However, the results show that low levels in some dimensions of attachment (Trust and Communication) tend to be compensated by the relationship with God
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
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