1,720,990 research outputs found
Denudation rates and geomorphic evolution of the Cape Mountains, determined by the analysis of the in situ-produced cosmogenic 10BE
No full textIncludes abstract.Includes bibliographical references.Southern Africa is host to a unique mountain system, the Cape Mountains, which includes the coastal Cape Fold Belt (CFB) and an inland Escarpment. Apatite fission track analysis has shown that this mountain system is an erosion feature, exhumed from beneath 2-7 km of overburden by large-scale denudation processes affecting the subcontinent during Gondwana break-up (ca. 140 – 65 Ma). Despite its antiquity and location on a passive continental margin, the ruggedness of the present-day topography of the Cape Mountains compares to that of the world’s active orogens. The coastal Cape Mountains are traversed by deeply-incised, meandering rivers that cut canyons through the most resistant quartzite ridges of these mountains, perpendicular to their structural grain inherited from the CFB. The evolution of this landscape is poorly understood, because little quantitative data exists on the denudation history of the Cape Mountains. This study presents the first in situ-produced cosmogenic 10Be inventories determined for quartz from catchment sediments and bedrock surfaces within the coastal Cape Mountains, with which to quantify denudation rates, exposure ages and the recent geomorphic evolution of these Cape Mountains. River sediments sampled from catchments within the Langeberg and Swartberg Ranges of the Western Cape, as well as bedrock from the Tradouw River traversing the Langeberg Range, were analysed. In addition, charcoal from alluvial material was collected for radiocarbon dating. Catchment-averaged denudation rates reported from these mountains range between 2.1 ± 0.3 and 6.9 ± 1.9 m·Myr-1. These are amongst the lowest reported rates globally, despite the rugged terrain of the mountain system. The spatial consistency between the low denudation rates suggests a landscape approaching geomorphic steady-state. This finding is best attributed to lithological control on denudation rates in a tectonically quiescent environment, and a relatively dry climate
[OBSOLETE] OCTOPUS Web Interface User Guide
No full textThis is an obsolete version; please refer to the GitHub page for the latest versions of guides to access OCTOPUS data: https://octopus-db.github.io/documentation/usage.html
This user guide outlines the features and functions of the OCTOPUS web interface, accessible at https://octopusdata.org/ Section one describes menus and tools within the interface. Section two describes example use cases that demonstrate the application of these tools.
For an overview of the OCTOPUS database, see: https://epicaustralia.org.au/resource/octopus and https://www.re3data.org/repository/r3d100013702
For detailed information about the OCTOPUS database structure, data collections, and documentation, see: https://zenodo.org/communities/octopus-database
The role of episodic geomorphic processes in the erosion and uplift of the Japanese Alps
Get PDFPrincipal Investigator: Alexandru T. CodileanDPRI Contact Person: Yuki Matsush
The role of episodic geomorphic processes in the erosion and uplift of the Japanese Alps
No full textPrincipal Investigator: Alexandru T. CodileanDPRI Contact Person: Yuki Matsush
山岳地形の発達における間欠的地形プロセスの役割 : 日本アルプスで構築したデータベースの再解析と新しい宇宙線生成核種分析の試み
No full textPrincipal Investigator: Dr. Alexandru T. CodileanDPRI Contact Person: Prof. Yuki Matsush
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
[OBSOLETE] OCTOPUS Database v.2: Relational database schema and documentation
No full textThis repository includes information pertaining to the relational database behind OCTOPUS v.2.
OCTOPUS v.2 is an Open Geospatial Consortium (OGC) compliant web-enabled database that allows users to visualise, query, and download cosmogenic 10Be and 26Al, luminescence, and radiocarbon ages and denudation rates associated with erosional landscapes, Quaternary depositional landforms and archaeological records, along with associated geospatial (vector and raster) data layers. The database follows the FAIR data principles and is based on open-source software deployed on Google Cloud Platform. Data stored in the database can be visualised, queried, and downloaded via a custom-built web interface and via desktop GIS applications that support OGC data access protocols. OCTOPUS can export data to various formats directly, including GML, JSON, Google Earth KLM and KMZ, and ESRI shapefile.
OCTOPUS-v2_Relational_Database_Schema-v.1.pdf: diagrammatic representation of the OCTOPUS v.2 relational database schema.
OCTOPUS-v2_SchemaSpy_Documentation-v.2.zip: queryable relational database documentation generated using SchemaSpy. To start, run: SchemaSpy/index.html
Variations on the Author
Get PDF“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
Get PDFWe 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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