1,721,056 research outputs found
GPR Measurements of ice thickness at Jamtalferner, Silvretta, 2015
No full textIce thickness is an important parameter complementing the long term mass balance time series at Jamtalferner in Austrian part of Silvretta (Eastern Alps). At the end of June 2015, ice thickness measurements were carried out. These measurements enabled the determination of ice thickness along the measurement profiles, the modeling of the subglacial topography of the Jamtalferner, and the calculation of the ice volume of the Jamtalferner. Based on this data and the glacier inventory, future scenarios of glacier area and ice thickness were developed, and a possible development of the mass balance (Chapter 8) was calculated. The scenarios indicate a complete dissolution of the glacier in the coming decades, with a drastic reduction in water supply. In April 2015, radar measurements of snow height were conducted to compare with the conventional mass balance. The point density of the radar measurement is higher, allowing for better detection of small-scale patterns, but the average value over the glacier is almost identical
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
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
Synthesis, oxidation resistance, thermal stability and, mechanical properties of TiAlB coatings
No full textIn the first part of this thesis, the effect of B concentration on phase formation and oxidation resistance of (Ti0.35Al0.65)By coatings with y = 1.7, 2.0, 2.4 was investigated. Elemental B targets in radio frequency mode and a compound Ti0.4Al0.6 target in direct current mode were sputtered. The B concentration was varied systematically by adjusting the applied power to the respective magnetrons while keeping the power supplied to the magnetron with the Ti0.4Al0.6 target constant. Measured lattice parameters and elastic properties are consistent with ab initio predictions. The oxidation resistance at 700 °C in air for up to 8 h was compared to a cathodic arc evaporated (Ti0.37Al0.63)0.49N0.51 coating with an Al/Ti ratio of 1.69 ± 0.20 which is very similar to 1.84 ± 0.40 for the boride coatings. Scanning transmission electron microscopy imaging revealed oxide scale thicknesses of 39 ± 7 and 101 ± 25 nm for (Ti0.35Al0.65)B2.0 and (Ti0.37Al0.63)0.49N0.51 after 8 h, respectively. Hence, the close to stoichiometric diboride outperforms the nitride coating. This behavior can be understood based on composition and structure analysis of the oxide scales: While the protective layer on the diboride is primarily composed of Al and O, the porous oxide layer on the nitride coating contains Ti, Al and O. In the second part, the impact of Al concentration on phase formation, mechanical properties, and oxidation behavior of stoichiometric Ti0.33-xAlxB0.67 with x = 0.04, 0.15, 0.21, and 0.28 is investigated. The experimental unit cell volume, obtained from X-ray diffractograms, and elastic modulus, measured by nanoindentation, of as-deposited coatings which are in good agreement with ab initio predictions exhibit a noticeable decline with increasing Al concentration. Analysis by scanning transmission electron microscopy revealed a bimodal, strongly Al concentration-dependent oxidation behavior where films containing ≤ 15 at. % of Al form a porous, non-passivating crystalline oxide scale containing Ti-rich as well as Al-rich oxide regions, while the formation of a passivating, dense, X-ray amorphous oxide scale was observed for films containing ≥ 21 at. % of Al. Coincident with the passive scale formation for Al concentrations ≥ 21 at. %, the elastic modulus decreases by ≥ 32.6 % compared to TiB2 and can be rationalized based on Al concentration-induced bond weakening as revealed by the concomitant cohesive energy reduction of ≥ 22 %. In the third and last part, the thermal stability of stoichiometric Ti0.12Al0.21B0.67 is explored by vacuum annealing at 1000 °C for 1 and 3 hours. The as-deposited and post-annealed coatings were compared regarding changes in chemical composition, phase formation, and morphology. X-ray diffraction data indicate the formation of a single-phase solid solution in the as-deposited Ti0.12Al0.21B0.67 thin films. After annealing for 1 h, scanning transmission electron microscopy, energy-dispersive X-ray mapping, and atom probe tomography investigations reveal segregation into Al- and Ti-rich (Ti,Al)B2 domains, consistent with spinodal decomposition. Furthermore, the formation of AlB12 with a concomitant reduction in Al concentration from 20.9 to 16.8 at. %, likely by evaporation, indicate the decomposition of Al-rich (Ti,Al)B2 domains during annealing for 1 h. Analysis of the sample after annealing for 3 h shows evidence for continued spinodal decomposition as well as for further decomposition of Al-rich (Ti,Al)B2 domains, leading besides the formation of AlB12 to a reduction in Al concentration to 12.5 at. % by Al evaporation. The observed phase formation trend during in-situ TEM studies at 1100 °C is consistent with the above discussed decomposition processes. The here identified thermal stability limit, revealed with spatially resolved structure and composition probes, confines the application temperature range of Ti0.12Al0.21B0.67 in vacuum to temperatures < 1000 °C and underlines that thermal stability investigations solely based on X-ray diffraction data result in an overestimated thermal stability
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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