130,545 research outputs found
Angle- and spin-resolved photoelectron spectroscopy of the 4f subshell in atomic ytterbium
No full textSvensson A, Müller M, Böwering N, Heinzmann U, Radojevic V, Wijesundera W. Angle- and spin-resolved photoelectron spectroscopy of the 4f subshell in atomic ytterbium. Journal of Physics B: Atomic, Molecular and Optical Physics. 1988;21(8):L179-L185.The spin polarisation components of photoelectrons from atomic ytterbium have been measured over the photon energy range from 15.5 to 22.5 eV. The measurements were performed by making use of circularly polarised synchrotron radiation from the storage ring BESSY in conjunction with an angle-resolved electron spectrometer. Theoretical predictions based on the relativistic random-phase approximation (RRPA) are in fair agreement with the experimental data even though a certain offset between theory and experiment exists
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Scholarly Communication and Publishing Lunch and Learn Talk #11: The ULS Open Access Author Fee Fund
No full textAt the May 2014 talk, you will learn about the ULS Open Access Author Fee Fund--what it is, why we do it, how it works, and how the program is going so far
The R&D Tax Incentives
No full textThis article sets out some background information and reflections of the author on the R&D tax incentive schemes included in the Common Corporate Tax Base (CCTB) Proposal. In particular the author analyzes the stimulus to private R&D through ad hoc tax incentives included in the CCTB Proposal and dives into the actual provisions included in the Proposal highlighting the most relevant issues connected with their design and interpretation. Moreover, the author explores the interaction between the CCTB Proposal and the granting by Member States of domestic R&D tax incentives
Méthode d\u27évaluation de l\u27influence urbaine sur le régime des crues d\u27un bassin versant de 130 km².
No full textL\u27objectif de la recherche consiste à évaluer l\u27influence du développement urbain en particulier, et de la modification des sols en général, sur l\u27aléa des crues. L\u27étude porte sur le bassin versant de l\u27Yzeron. Il s\u27agit d\u27un bassin versant de taille moyenne (150 km²), situé à l\u27ouest de Lyon, où l\u27on rencontre un évolution rapide et hétérogène de l\u27urbanisation, laquelle se développe le plus souvent sous forme de petits centres urbains autour des anciens villages et se structure autour des axes de circulation principaux. Concernant le site d\u27étude, il semble que l\u27augmentation observée des crues soit due à une conjonction de causes qui jouent toutes dans le même sens (pluviosité plus forte dans les années 90 que dans les années 70 et modification de l\u27occupation des sols), sans qu\u27une seule de ces causes ne soit suffisante à elle seule pour expliquer la totalité du phénomène. Sur le plan méthodologique, deux enseignements majeurs peuvent être tirés de cette recherche : - L\u27utilisation d\u27un modèle de simulation correctement calé sur des séries de mesures de bonne qualité permet dans une certaine mesure de s\u27affranchir des fluctuations inter-annuelle de la pluviosité et d\u27isoler l\u27influence de l\u27urbanisation sur le régime des crues. - L\u27analyse des écarts entre les courbes QCX au moyen de tests statistiques présente l\u27avantage de permettre la comparaison des propriétés statistiques des séries de crues en s\u27affranchissant d\u27une partie des difficultés dues aux écarts entre mesures et résultats de simulation
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