1,721,066 research outputs found
Introduction to the special issue 'Analysis of sediment properties and provenance: tools for palaeo-environmental reconstruction'
No full textstatus: Publishe
Bulk organic geochemistry (TOC, TN, d13C, d15N) of suspended river sediments from Chilean Patagonia
No full textThis dataset presents bulk organic geochemical data (TOC, TN, d13C, d15N) obtained by EA-IRMS analysis on 16 suspended river sediments from vertical profiles in four of the largest rivers of Chilean Patagonia (44-48°S). The samples were collected in November 2011, i.e., in Spring, when river discharge is the highest. Surface samples (10 cm depth) were taken with a bucket, and deeper samples were collected with a horizontal WaterMark® 5L sampling bottle equipped with a depth/pressure sensor. All the water samples were stored in pre-rinsed I-chem cubitainers and filtered within 48 hours using a pressurized filtration system equipped with a 90 mm diameter PES membrane (pore size 0.22 µm)
Bulk organic geochemistry (TOC, TN, d13C, d15N) of 61 surface soil samples from Chilean Patagonia
No full textThis dataset presents bulk organic geochemical data (TOC, TN, d13C, d15N) obtained by EA-IRMS analysis on 61 surface soil samples from Chilean Patagonia (44-48⁰S). The samples were collected in 2009 and 2013. They were obtained with a metal trowel in the epipedon, i.e., upper 10 cm of soil profiles, generally in road cuts, river cuts, or recent quarries. They were dry-sieved <90 µm before analysis. These soils constitute one of the most important sources of biospheric organic carbon to the Patagonian fjords. The elemental and isotopic measurements were used to (a) assess the influence of precipitation on organic carbon content and stable isotopes, and (b) characterize the composition of this biospheric organic carbon source to the Patagonian fjords
Bulk organic geochemistry (TOC, TN, d13C, d15N) of sediment grain-size fractions from rivers in Chilean Patagonia
No full textThis dataset presents bulk organic geochemical data (TOC, TN, d13C, d15N) obtained by EA-IRMS analysis on sediment grain-size fractions from 6 rivers in Chilean Patagonia (n=75). The samples were separated in 10 to 12 grain-size fractions below 1000 µm to assess the influence of grain-size on river sediment geochemistry. Separation was made following the phi scale, using dry sieving for the particles coarser than 32 µm and an Atterberg sedimentation column for the <32 µm fractions. A sub-sample was also dry-sieved at 90 µm
Bulk organic geochemistry (TOC, TN, d13C, d15N) of 3 vertical profiles from Holocene volcanic ash soils in Chilean Patagonia
No full textThis dataset presents bulk organic geochemical data (TOC, TN, d13C, d15N) obtained by EA-IRMS analysis on 108 samples from 3 vertical profiles from Holocene volcanic ash soils in Chilean Patagonia (44-48°S). The samples were collected in 2012 and 2013 at a vertical resolution of 5-10 cm. The samples were collected with a metal trowel, after cleaning the vertical profile with a shovel. They were dry-sieved <90 µm before analysis. The mineralogical and inorganic geochemical composition of the same samples was published in Vandekerkhove et al. (2016) and are available on Earthchem (doi:10.1594/IEDA/100526)
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
Replication Data for: Micrometer-scale sediment grain-size prediction using X-Ray Fluorescence geochemistry and Computed Tomography density scanning data
No full textThis dataset contains the data generated for the study "Micrometer-scale sediment grain-size prediction using X-Ray Fluorescence geochemistry and Computed Tomography density scanning data" by Auer et al. 2025.
The study presents a method that allows micrometer-scale prediction of mean grain size. The authors integrate grain size-sensitive Computed Tomography (CT) density data into a linear regression-based modelling approach that relies on X-ray fluorescence (XRF) geochemistry. Via experiments on synthetic cores and real-world applications on sediment cores with published grain-size profiles, the study demonstrates that CT scans improve the predictability of grain size, especially in sediments with a homogenous geochemistry, where CT data can be used as a sole predictor
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
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