1,720,987 research outputs found
Data for "Mapping the vertical heterogeneity of Greenland’s firn from 2011-2019 using airborne radar and laser altimetry"
No full textThis dataset contains the radar sounding peak offsets used to map the vertical firn heterogeneity across the Greenland Ice Sheet, and published in Rutishauser et al. (2024)
GPR derived snow depth over A. P. Olsen Ice Cap (2008-2024)
No full textThis dataset contains ground-penetrating radar (GPR)-derived end-of-winter snow depths over A.P. Olsen Ice Cap for the period 2008–2024. GPR data were collected using a MALÅ Geoscience ProEx unit with 500 MHz (2008–2011) or 800 MHz (2012–2024) shielded antennas. Data were processed using the ReflexW-2D software package.
Raw GPR data can be found in GPR_raw_2008_2024.zip. Processed GPR data, including ReflexW files, are available in GPR_processed_2008_2024.zip.
The yyyy_GPR_snowdepth.txt files contain the picked reflection of the last summer surface (using ReflexW), converted to snow depths for each survey year. The variables are:
ProfName: Profile Name
TraceNr: GPR trace number as recorded along the profile
lon: Longitude, degrees East (GPS coordinates recorded with handheld unit, interpolated)
lat: Latitude, degrees North (GPS coordinates recorded with handheld unit, interpolated)
Elev: Elevation, meters above sea level (GPS coordinates recorded with handheld unit, interpolated)
X: Easting, kilometers, EPSG:3413
Y: Northing, kilometers, EPSG:3413
dist: Profile distance, meters
twt: Two-way travel time to the picked reflector, nanoseconds
depth: Snow depth, meters
v_snow: Radar velocity used for time-to-depth conversion, m/ns
rho_snow: Snow density used to calculate radar velocity, kg/m3
Amp: Amplitude of the picked reflector
The yyyy_GPR_snowdepth_ds.txt files contain snow depth data downsampled to a 2 m interval for each survey year.
2008_2024_GPR_snowdepth_ds.txt contains all downsampled data from the years 2008–2024.
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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
Assessing the spatial representativeness of firn core observations in the Greenland Ice Sheet percolation zone
No full textThe Greenland Ice Sheet is increasingly losing mass due to a warming climate and is a major contributor to sea level rise. In the percolation zone, there is a net mass gain, but surface melt occurs during the summer months. Meltwater can percolate into the firn, filling free pore space and buffering its contribution to sea level rise. However, ice layers within the firn matrix inhibit meltwater percolation and reduce the firn's buffering capacity. Understanding these processes is crucial for assessing the ice sheet's mass balance, and they are studied using various methods, including modelling and remote sensing. In-situ measurements, such as firn cores, are essential for their validation and improving the general understanding of the firn processes. Here, the spatial representativeness of firn cores is assessed by comparing them with ground-penetrating radar (GPR) surveys from four sites with automatic weather stations of the Greenland Climate Network (GC-Net) in the percolation zone. Strong radar reflectors are traced using an automated peak detection method and analysed across different segments of each site. The comparison between the segments reveals variations and similarities across the study areas. Results indicate that thick ice layers and major density changes vary in depth but are continuous over the surveyed areas, supporting the representativeness of firn cores over several hundred metres. However, thin ice layers and percolation features are more spatially variable, and the applied method is not able to find small-scale variations of these discontinuous ice structures within the firn matrix. No influence of the annual maintenance work around the automatic weather stations on the firn structure is found. Additionally, the change in the firn structure over one year is analysed using the SNOWPACK model and the results are compared to firn core and temperature observations. While the model performs well at some sites, significant discrepancies exist at others, highlighting the challenges of accurately modelling the diverse percolation zone of the Greenland Ice Sheet.CRYO
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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