1,721,403 research outputs found
Th@<i>T</i><sub><i>d</i></sub>(19151)<i>-</i>C<sub>76</sub>: A Highly Symmetric Fullerene Cage Stabilized by a Tetravalent Actinide Metal Ion
No full textFor the first time, Th@Td(19151)-C76, a highly
symmetric C76 cage encapsulating an actinide metal ion,
has been synthesized and characterized by single-crystal X-ray crystallography,
mass spectrometry, UV–vis–NIR spectroscopy, and cyclic
voltammetry. The single-crystal crystallographic analysis unambiguously
assigned the fullerene cage as Td(19151)-C76 and confirmed Th@Td(19151)-C76 as the first IPR (isolated-pentagon
rule) C76-based monometallofullerene. The crystallographic
results further revealed that the optimal Th site resides over a sumanene-type
hexagon, similar to that of the Th@C1(11)-C86 but different from the previously reported Th@C3v(8)-C82. In addition, electrochemical
study found that Th@Td(19151)-C76 processes an unusually low
first oxidation potential (0.03 V), suggesting its strong electron
donating ability
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
(Cyto)genetic analysis of (oligodendro)glial tumors
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19151.pdf (Publisher’s version ) (Open Access)The goal of the studies described in this thesis was to identify genetic markers with prognostic or therapeutic implications for the less common glial tumors, the oligodendroglial tumors (OTs), including both pure oligodendrogliomas (Os) and mixed oligo-astrocytomas (OAs), and the ependymal tumors (Es). We screened 29 Os and 39 OAs for chromosomal imbalances using comparative genomic hybridization (CGH). A loss of 1p (-1p) and -19q were most frequently detected and 4 different genetic subtypes were identified. Comparing histopathology, genetic subtype and clinical data, we showed that genetic subtyping correlates with survival, independent of histopathological diagnosis. Furthermore, we confirm the previous observation of Cairncross et al. that -1p is predictive for chemosensitivity. Unequivocal criteria for the delineation of OAs from Os and pure astrocytic tumors (As) are lacking, and application of a more 'strict' as opposed to a more 'relaxed' histopathological approach, resulted in a higher frequency of '-1p/-19q' tumors among the hg-OAs. However, some tumors containing -1p (predicting chemosensitivity) are not classified as OAs and therefore these patients will not be included in the chemotherapy protocols for OTs, underlining the clinical value of genetic analysis. Performing CGH on 20 Es showed that -22 was the most frequently detected imbalance. Combining our results with those of others (58 tumors), we showed that some aberrations occur predominantly in a specific category suggesting age and/or localization related genetic subtypes. Overall, our results show that different genetic subtypes can be identified among OTs and Es which can provide information about the tumor type, grade of malignancy, and chemosensitivity. Genetic analysis appears to be a valuable diagnostic tool, on the basis of which a more accurate estimation of prognosis can be provided and a more optimal and 'tailor made' therapeutic approach can be chosen for the individual patient.192 p
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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