1,721,029 research outputs found
Figure 2 in A conservation palaeobiological approach to assess faunal response of threatened biota under natural and anthropogenic environmental change
No full textFigure 2. Overview of core data. From left to right each core: core photograph, lithology, facies, fauna relative abundance per species group based on origin, evolution and estimated palaeosalinities.Published as part of van de Velde, Sabrina, Jorissen, Elisabeth L., Neubauer, Thomas A., Radan, Silviu, Pavel, Ana Bianca, Stoica, Marius, Van Baak, Christiaan G. C., Martínez Gándara, Alberto, Popa, Luis, de Stigter, Henko, Abels, Hemmo A., Krijgsman, Wout & Wesselingh, Frank P., 2019, A conservation palaeobiological approach to assess faunal response of threatened biota under natural and anthropogenic environmental change, pp. 2423-2442 in Biogeosciences 16 (12) on page 2430, DOI: 10.5194/bg-16-2423-2019, http://zenodo.org/record/502020
Fig. 12 in Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan)
No full textFig. 12. Magnetostratigraphy of the Hajigabul section. In columns from left to right: Regional stages; Depositional units; Lithological log; Biostratigraphic sampling points, where green points are mollusc samples and blue points - microfauna samples; Magnetic susceptibility (plotted on a logarithmic scale)); Inclination; Declination; Interpreted polarity. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)Published as part of Lazarev, Sergei, Jorissen, Elisabeth L., van de Velde, Sabrina, Rausch, Lea, Stoica, Marius, Wesselingh, Frank P., Van Baak, Christiaan G.C., Yanina, Tamara A., Aliyeva, Elmira & Krijgsman, Wout, 2019, Magneto-biostratigraphic age constraints on the palaeoenvironmental evolution of the South Caspian basin during the Early-Middle Pleistocene (Kura basin, Azerbaijan), pp. 1-26 in Quaternary Science Reviews (e105895) 222 on page 21, DOI: 10.1016/j.quascirev.2019.105895, http://zenodo.org/record/502094
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
Strontium isotopes reveal large connectivity changes during the late Miocene-Pliocene in restricted Dacian Basin (Romania) of the Eastern Paratethys
No full textDuring the late Miocene-Pliocene the Dacian Basin was the western appendix of the Black Sea. The restricted paleogeographical location of the Dacian Basin within the larger Paratethys-Mediterranean system made possible unique recordings of hydrological changes governed by short lived connections to the open marine realm. The data set presented here is based on strontium isotopes (87Sr/86Sr) measured on ostracod shells collected from a well dated Miocene to Pliocene succession exposed along Slanicul de Buzau Valley, located in the Carpathian Foredeep of Romania (part of the Dacian Basin). We measured the 87Sr/86Sr only on ostracods. The choice for ostracods is twofold: 1) they occur abundantly in the fresh to brackish deposits of the Paratethys, while these environments are generally not suitable for the occurrence of foraminifera or other typical marine organisms; 2) ostracods bear in general low ornamentation and they molt their entire shell in one event. We used ostracods from the Slanicul de Buzau section and added 39 new 87Sr/86Sr data points to the earlier acquired results from Rîmnicu Sărat, extending and refining in this way the Dacian Basin 87Sr/86Sr record from the late Miocene (Khersonian) to the Pleistocene (Romanian Stage). Age constraints for Slanicul de Buzau section are provided by biostratigraphy coupled to magnetostratigraphy. Additionally, the section is correlated by magneto- biostratigraphy to the previously investigated Rîmnicu Sărat section, 15 km to the north. The detailed 87Sr/86Sr record for the Dacian Basin provides an exceptional record of basin connectivity from the latest Tortonian (ca. 7.7 Ma) until the early Pleistocene (ca. 1.8 Ma). Relatively high 87Sr/86Sr originated either from marine incursions from water supplied by the Balta delta in the East Carpathian Foreland, or from outflow waters of Lake Pannon and local rivers, while low 87Sr/86Sr likely originated from connectivity with the Black Sea region. Data 87Sr/86Sr record indicates that a late Tortonian transgression (7.6‒7.4 Ma) started with an incursion of Eastern Paratethys waters into the Dacian Basin. Afterwards, local rivers became the dominant source for the mostly freshwater environments of the early Messinian. The regional Maeotian-Pontian transitional interval, between 6.3‒5.9 Ma, is marked by a second incursion of Eastern Paratethys waters, but during this event, an additional marine (Mediterranean) influx coincides with a short-lived salinity incursion. During the Messinian Salinity Crisis of the Mediterranean, the Dacian Basin connected progressively to the Eastern Paratethys (5.9‒5.5 Ma). The Dacian Basin became restricted during the peak Mediterranean lowstand at ~5.5 Ma and filled with Lake Pannon and local river water between 5.5‒5.3 Ma. During the Plio-Pleistocene, the Dacian Basin reconnected with the Black Sea (at that time isolated from the ocean ocean), which shows similar 87Sr/86Sr as in the Last Glacial Maximum. When evaluating the application of 87Sr/86Sr in assessing the connectivity (i.e. to open ocean) we conclude that the Dacian Basin (between 7.6 and 1.7 Ma) is an opposite counterpart to the Mediterranean during the Messinian Salinity Crisis. While the latter was a marine basin affected by relatively short term disconnection form the ocean, the former (the Dacian Basin) was a part of a large brackish-lacustrine isolated domain affected by a very short connection to the marine realm. Samples were collected from Slanic de Buzau (Romania) deposits exposed on the left side of the Slănicul river, along the Mânzăleşti (GPS 45°29'18.74 N; 26°39'10.30E). The dataset include all 87Sr/86Sr measured on ostracods and one foraminifera level
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
Figure 3 in A conservation palaeobiological approach to assess faunal response of threatened biota under natural and anthropogenic environmental change
No full textFigure 3. Sampling locations of three expeditions in 2015–2017. The first (September–October 2015) and second expeditions (July 2016) were searching for living Pontocaspian molluscs in particular. The third expedition consisted of six transects sampled by GeoEcoMar in 2017 in search of any living mollusc. In the legend w/wo means with or without.Published as part of van de Velde, Sabrina, Jorissen, Elisabeth L., Neubauer, Thomas A., Radan, Silviu, Pavel, Ana Bianca, Stoica, Marius, Van Baak, Christiaan G. C., Martínez Gándara, Alberto, Popa, Luis, de Stigter, Henko, Abels, Hemmo A., Krijgsman, Wout & Wesselingh, Frank P., 2019, A conservation palaeobiological approach to assess faunal response of threatened biota under natural and anthropogenic environmental change, pp. 2423-2442 in Biogeosciences 16 (12) on page 2431, DOI: 10.5194/bg-16-2423-2019, http://zenodo.org/record/502020
Figure 3 in A conservation palaeobiological approach to assess faunal response of threatened biota under natural and anthropogenic environmental change
No full textFigure 3. Sampling locations of three expeditions in 2015–2017. The first (September–October 2015) and second expeditions (July 2016) were searching for living Pontocaspian molluscs in particular. The third expedition consisted of six transects sampled by GeoEcoMar in 2017 in search of any living mollusc. In the legend w/wo means with or without.Published as part of van de Velde, Sabrina, Jorissen, Elisabeth L., Neubauer, Thomas A., Radan, Silviu, Pavel, Ana Bianca, Stoica, Marius, Van Baak, Christiaan G. C., Martínez Gándara, Alberto, Popa, Luis, de Stigter, Henko, Abels, Hemmo A., Krijgsman, Wout & Wesselingh, Frank P., 2019, A conservation palaeobiological approach to assess faunal response of threatened biota under natural and anthropogenic environmental change, pp. 2423-2442 in Biogeosciences 16 (12) on page 2431, DOI: 10.5194/bg-16-2423-2019, http://zenodo.org/record/502020
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
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