1,720,979 research outputs found
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
Reoccupation of late Quaternary relative sea level indicators in a tectonically quasi-stable coastal area in Southern Italy (Cilento headland): Insights into the Last Interglacial stillstands
Full text linkA geomorphological-stratigraphical study, integrated with a modelling approach, has been employed to constrain the age of relative sea-level indicators (RSLi) along the quasi-stable Mt. Bulgheria coast in the southern Apennines, located on the eastern margin of the Tyrrhenian Sea. Focusing on the geological evidence of late Quaternary sea-level fluctuations within the 0 to 12 m above sea level (a.s.l.) elevation range, we describe RSLi along ca. 8 km of coastline and constrain their elevation, including those of previously undated RSLi in the same area. The reassessment of field data was needed to address the phenomenon of the reoccupation of older RSLi by younger ones. The approach employs the synchronous correlation method, integrating highstand peak elevations
from global sea-level curves and a calibrated uplift rate value, derived from the correlation of RSLi-2 (currently at 8 ± 1 m a.s.l.) with Marine Isotope Stage (MIS) 9c, as suggested by recent findings.
Overall, four RSLi are identified in the investigated coastal zone: RSLi-1 (11 ± 1 m a.s.l.), correlated with MIS 11; RSLi-2 (8 ± 1 m a.s.l.), correlated with MIS 9c and reoccupied during the first MIS 5e peak; RSLi-3 (4 ± 0.5 m a.s.l.) formed during an earlier, undefined stage and reoccupied during MIS 5e; RSLi-4 (2.5 ± 0.5 m a.s.l.) also assigned to MIS 5e. Notably, two cases of reoccupation of older RSLi by younger ones are here reported.
By testing multiple global sea-level curves, we derived a range of possible uplift rates for the chronologically constrained RSLi-2. Consequently, assuming a constant uplift rate throughout the final part of the Middle Pleistocene, we sought the optimal match between all observed RSLi and predicted elevation of palaeo sea levels during past highstands.
The preferred best fit was obtained using a composite eustatic curve from Waelbroeck et al. (2002) and Kopp et al. (2013, for within the MIS5e), and a constant uplift rate of 0.009 mm/yr. Our modelling of MIS 5e (Last Interglacial) identifies three sea-level stillstands and a rapid drop in sea level following the first and higheststillstand. Our results emphasize the importance of the reoccupation problem in sea-level reconstruction studies, especially for RSLi located in regions that are tectonically stable or with relatively low rates of crustal vertical movements. In such contexts, the sea level during younger interglacials may reach or exceed the elevations of older interglacials, reusing or modifying existing RSLi and complicating the identification of which sea-level stand created a specific shoreline feature. The calibrated model supports scenarios where MIS 5e, MIS 9c and MIS 11 had higher peaks than the Holocene (so far). Finally, this work challenges the assumption that RSL indicators ranging between 5 and 8 m a.s.l. in stable regions were exclusively formed during MIS 5e, emphasising
the need for precise age constraints in these interpretations
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
Quantifying rates of active extension and seismic hazard in the upper plate of subduction zones
Full text linkTo test the hypothesis that crustal deformation within the deforming upper plate of the Ionion Subduction Zone, influences uplift in the Calabrian Arc (CA), sequences of tectonically-deformed uplifted palaeoshorelines have been mapped, dated and assigned ages. These regions have historically experienced damaging earthquakes, yet, crustal deformation rates spanning the Late Quaternary are unclear and poorly-constrained. Uplifted Quaternary palaeoshorelines are preserved: (i) on the hangingwalls and footwalls of major Quaternary normal faults deforming the CA and (ii) within the deforming foreland region. This thesis constrains the relationship between historical seismicity, "regional" uplift and upper plate crustal deformation, quantifying both the "local" signal due to the normal faulting and the "regional" uplift. To assign ages to palaeoshorelines, a synchronous correlation approach is applied, driven by new absolute age controls alongside those available in the literature. This assigns ages to un-dated palaeoshorelines suggesting: (i) new uplift rate scenarios and (ii) new long-term fault slip-rates. Uplift rate variations are mapped: (i) along the strike of the upper plate normal faults and (ii) along the foreland region, either constant and fluctuating through time. The deformation rates are used to discuss seismic hazard in southern Italy. Moreover, elastic half-space modelling is used to replicate levelling data from 1907-1909 to test if the Messina Strait fault is the seismogenic source of the 1908 Mw 7.1 Messina Earthquake, the most destructive earthquake recorded in Europe. Overall, this thesis shows that: (i) critically-assigning ages to un-dated palaeoshorelines by applying synchronous correlation approach is crucial to obtain reliable long-term deformation rates and (ii) upper plate crustal vertical rates should be removed if observations from deforming upper plates are used to derive slip distribution on the subduction interface
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
Quantifying rates of active extension and seismic hazard in the upper plate of subduction zones
Full text linkTo test the hypothesis that crustal deformation within the deforming upper plate of the Ionion Subduction Zone, influences uplift in the Calabrian Arc (CA), sequences of tectonically-deformed uplifted palaeoshorelines have been mapped, dated and assigned ages. These regions have historically experienced damaging earthquakes, yet, crustal deformation rates spanning the Late Quaternary are unclear and poorly-constrained. Uplifted Quaternary palaeoshorelines are preserved: (i) on the hangingwalls and footwalls of major Quaternary normal faults deforming the CA and (ii) within the deforming foreland region. This thesis constrains the relationship between historical seismicity, "regional" uplift and upper plate crustal deformation, quantifying both the "local" signal due to the normal faulting and the "regional" uplift. To assign ages to palaeoshorelines, a synchronous correlation approach is applied, driven by new absolute age controls alongside those available in the literature. This assigns ages to un-dated palaeoshorelines suggesting: (i) new uplift rate scenarios and (ii) new long-term fault slip-rates. Uplift rate variations are mapped: (i) along the strike of the upper plate normal faults and (ii) along the foreland region, either constant and fluctuating through time. The deformation rates are used to discuss seismic hazard in southern Italy. Moreover, elastic half-space modelling is used to replicate levelling data from 1907-1909 to test if the Messina Strait fault is the seismogenic source of the 1908 Mw 7.1 Messina Earthquake, the most destructive earthquake recorded in Europe. Overall, this thesis shows that: (i) critically-assigning ages to un-dated palaeoshorelines by applying synchronous correlation approach is crucial to obtain reliable long-term deformation rates and (ii) upper plate crustal vertical rates should be removed if observations from deforming upper plates are used to derive slip distribution on the subduction interface
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