1,720,966 research outputs found
Internal Differentiation of the Archean Continental Crust: Fluid-Controlled Partial Melting of Granulites and TTGAmphibolite Associations in Central Finland
No full textFault bound blocks of granulite and enderbite occur within upper amphibolite-facies migmatitic tonalitictrondhjemiticgranodioritic (TTG) gneisses of the Iisalmi block of Central Finland. These units record reworking and partial melting of different levels of the Archean crust during a major tectonothermal event at 2627 Ga. Anhydrous mineral assemblages and tonalitic melts in the granulites formed as a result of hydrous phase breakdown melting reactions involving amphibole at peak metamorphic conditions of 811 kbar and 750900C. A nominally fluid-absent melting regime in the granulites is supported by the presence of carbonic fluid inclusions. The geochemical signature of light rare earth element (LREE)-depleted mafic granulites can be modelled by 1030 wt partial melting of an amphibolite source rock leaving a garnet-bearing residue. The degree of melting in intermediate granulites is inferred to be less than 10 wt and was restricted by the availability of quartz. Pressuretemperature estimates for the TTG gneisses are significantly lower than for the granulites at 660770C and 56 kbar. Based on the PT conditions, melting of the TTG gneisses is inferred to have occurred at the wet solidus in the presence of an H(2)O-rich fluid. A hydrous mineralogy, abundant aqueous fluid inclusions and the absence of carbonic inclusions in the gneisses are in accordance with a water-fluxed melting regime. Low REE contents and strong positive Eu anomalies in most leucosomes irrespective of the host rock composition suggest that the leucosomes are not melt compositions, but represent plagioclasequartz assemblages that crystallized early from felsic melts. Furthermore, similar plagioclase compositions in leucosomes and adjacent mesosomes are not a migmatite paradox, as both record equilibration with the same melt phase percolating along grain boundaries
Thermal conductivity measurements of nearshore sediments in Eckernförde Bay, Baltic Sea aquired during ALKOR cruise AL584
No full textThermal conductivity data of nearshore sediments were collected during ALKOR cruise AL584 in November 2022 using the VibroHeat system developed by FIELAX GmbH. This system combines a vibrocorer with a sensor string that contains 22 negative temperature coefficient thermistors (NTCs) and a heating wire over which a defined heat pulse is released. In-situ temperature and thermal conductivity of the sediment are calculated for each thermistor using the inversion method according to Hartmann & Villinger (2002)
Sea ice thickness and radiation measurements above the Arctic Ocean, Spitzbergen, during POLAR 5 campaign SoRPIC with links to raw data files
No full textSoRPIC (short for Solar Radiation and Phase Discrimination of Arctic Clouds) is a scientific project to investigate the effects of mixed-phase clouds on the energy budget of the Earth's atmosphere in the Arctic. Similar to greenhouse gases, they interact with solar and terrestrial (thermal infrared) radiation. Generally and annually averaged, Arctic boundary-layer clouds tend to have a warming effect: While the clouds reflect solar energy back into space, they also keep terrestrial (thermal) radiation from escaping into space. The resulting impact, however, is in detail highly variable and depends on various properties of the clouds and of the underlying surface. Furthermore, the long periods of polar day and polar night makes the estimation of the overall effect even more complicated. The Arctic boundary-layer mixed-phase clouds are particularly difficult to include in climate models, but play a crucial role in the predictions. The SoRPIC participants have performed airborne measurements of the microphysical and radiative properties of clouds in the Norwegian Arctic (based in the town of Longyearbyen on the Svalbard archipelago) in April and May 2010.
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Find further documention of calibration routines at hdl:10013/calibration.100
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
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