1,721,050 research outputs found
Dissolved and particulate carbohydrates and inorganic ions in the sea surface microlayer and bulk water of Kongsfjorden (Autumn 2021/Spring 2022)
No full textSea surface microlayer (SML) and bulk water samples were collected from various locations in Kongsfjorden (Svalbard) during autumn 2021 and spring 2022. SML samples were obtained using the glass plate method, while corresponding bulk water samples (1 m depth) were collected with a telescopic rod. The following chemical parameters were analyzed: dissolved free carbohydrates (DFCHO), dissolved combined carbohydrates (DCCHO), particulate combined carbohydrates (PCCHO), and major inorganic ions. DFCHO and DCCHO concentrations were determined from filtered seawater (0.2 µm) after desalination via electrodialysis, followed by high-performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD). PCCHO concentrations were measured from 0.2 µm polycarbonate membrane filters. All carbohydrate fractions (DFCHO, DCCHO, PCCHO) were quantified as the sum of individual monosaccharides, including arabinose, glucose, galactose, glucosamine, galactosamine, muramic acid, galacturonic acid, and others
Marine combined carbohydrates and inorganic ions in atmospheric total suspended particles across altitudes in the lower troposphere of Ny-Ålesund, Svalbard
No full textThis dataset presents major aerosol particle constituents, including sodium, chloride, and combined carbohydrates, from balloon-borne samples collected in autumn 2021 and spring 2022 in Ny-Ålesund (Svalbard). Total suspended particle (TSP) samples were collected at altitudes ranging from 321 to 1112 m, encompassing both the boundary layer and the free troposphere. In addition, ground-based TSP samples were collected directly at the balloon winch site and at the Old Pier, where fresh sea spray aerosol (SSA) was sampled. Monosaccharides were quantified following acid hydrolysis of the combined carbohydrates
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
Free neutral monosaccharides and combined monosaccharides in seawater and related saline matrices
No full textBulk seawater, surface microlayer, ice core and brine samples from the Arctic, the North and Tropical Atlantic and Raunefjorden were investigated on their sugar concentrations. Free neutral monosaccharides (DFCHO) and combined monosaccharides/polysaccharides (CCHO) were determined using high performance anionic exchange chromatography with pulsed amperometric detection (HPAEC-PAD) and electro-dialysis for prior desalination
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
Combined carbohydrates, organic carbon and total aerosol mass concentrations in size-resolved aerosol particles sampled from the Arctic in 2017
No full textSize-resolved aerosol particles were collected in the Arctic during the PS106 campaign (2017). For the collection of the aerosol particles, a five-stage low-pressure BERNER impactor was used. The size of the particles ranged between 50 nm and 10 µm. Sampling was conducted on board the German research vessel Polarstern. These aerosol particle samples were characterized on total aerosol mass concentration, combined carbohdrates (CCHO) and organic carbon (OC). Sampling altitude: ca. 25 m above sea level
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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