1,720,965 research outputs found
The Large Enriched Germanium Experiment for Neutrinoless Double-beta Decay
No full textOverview Poster on the LEGEND experimen
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
The effect of neutron excess and nuclear deformation on dipole strength functions below the neutron separation energy - nuclear resonance fluorescence experiments on 124,128,132,134 Xe at ELBE and HI gamma S
Get PDFWithin this thesis, nuclear resonance fluorescence experiments were analyzed which have been performed at the gamma ELBE facility of the Helmholtz-Zentrum Dresden-Rossendorf and the HI gamma S facility of the Triangle Universities Nuclear Laboratory. The dipole strength up to the neutron separation energy, its distribution as well as its split into electric and magnetic strength were determined. The influence of crucial nuclear parameters, like deformation and neutron excess, on the data was investigated.
For the first time a whole set of enriched gaseous targets was measured in the energy region close to the neutron separation threshold. At ELBE the scattering of photons on four different isotopes 124, 128, 132, 134 Xe was investigated by irradiating containers with enriched target material with a broad bremsstrahlung distribution. The endpoint energies were chosen to be 12MeV. This ensures excitations up to the neutron separation threshold. The two isotopes 128, 134 Xe were measured in an additional campaign at HI gamma S facility. The region below the threshold was explored in detail in these experiments. A second, more model-independent determination of the cross section was possible.
The work shows, how the measured spectra taken with high-purity germanium detectors, have to be corrected for several, partly overlapping effects in order to determine the complete excitation strength.
The calculation of different backgrounds, detector response functions and the influence of inelastic scattering constitute the main part of the presented work. With the help of GEANT4 simulations the amount of not-nuclear scattered photons was estimated. GEANT4 was also used to test the influence of the extended targets on the detection efficiency and response. The code gamma DEX, which calculates deexcitation schemes based on statistical assumptions, was updated and finally used for the unfolding of the spectrum.
The measured data is compared to different strength function models and a theoretical prediction based on a QRPA calculation. The summed strength is also set into comparison to other experimental data sets and a global trend for low-lying strength was found. This shows, that the nuclear deformation which has a large influence on the dipole strength above the threshold is only of minor impact for the strength at lower energies.
Instead of this, the neutron excess seems to be the dominating factor for the strength in the investigated energy region.
This work was supported by the German Research Foundation (DFG), Project No. SCHW883/1-1
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
Bestimmung der elektromagnetischen Dipolstärkeverteilung in mittelschweren Atomkernen mittels Kernresonanzfluoreszenz
Get PDFIm Rahmen der Arbeit wurden Experimente aus den Jahren 2008/09 für die Kerne 86Kr und 136Ba analysiert. Zur Auswertung mussten neben Photonenfluss- und Effizienzbestimmung auch Simulationen durchgeführt werden, welche die experimentellen Bedingungen widerspiegeln. Nicht am Kern gestreute Ereignisse und Detektorantwortfunktionen wurden mit Hilfe des Programmpaketes GEANT4 simuliert, um in den gemessenen Daten berücksichtigt zu werden. Daraus zeigt sich, dass neben diskreten Energiezuständen auch ein beachtlicher Teil des ermittelten Anregungsquerschnitts in einer Art Quasikontinuum aus unauflösbaren Peaks liegt. Die ermittelten Wirkungsquerschnitte werden mit Hilfe eines statistischen Ansatzes auf Verzweigung in mögliche Zerfallskanäle und auf Fütterung durch Zustände höherer Energie korrigiert
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
- …
