1,720,974 research outputs found
3D Laser Scan Data: La Charce Sedimentary Outcrop, France
No full textThis .ptx file is a 3D point cloud (XYZiRGB) of a sedimentary rock outcrop near La Charce, France. It was used for the data analysis in Matlab completing the Master thesis: "Characterizing Sedimentary Outcrops with Laser Scanning: Applied to Cretaceous deep marine limestone-marl sequences in the Vocontian Basin, France". It can be opened in the open source software, CloudCompare
Development of Small-Scale Hyperspectral Imaging for Ocean Science on small satellites and robotic agents
No full textThe world’s oceans are dynamic systems with complex geophysical, chemical, and biological interactions ranging in scale from microscopic phytoplankton to oceanic gyres. Not a single instrument can be tuned to observe all of these aspects at once, but a multidisciplinary approach of fusing many sensor observations into one representation provides a better understanding. Larger scale phenomenon, such as algal blooms, require high-level spatial sensing capability and frequent updates as the blooms grow or shrink, move, and disperse in a matter of minutes to hours. Many algal blooms can be easily detected with the human eye by their characteristic green, turquoise, or even red-hued waters. Going further into the science behind what is causing the blooms, if they harmful or not, etc., requires more information about their composition. Spectral signatures, or the fingerprint of light reflected from a target, can help scientists discover these more nuanced details.
Spectral imaging of large-scale features is still a relatively novel remote sensing method. Early earth observation imagers were mounted in aircraft in the 1980’s to collect several spectral bands beyond the standard red-green-blue photographs of the time. The airborne surveys revealed both an efficient method for gathering data over a large region and a unique way to identify minerals and vegetation based on composition (or spectral signatures). Compared to handheld imaging and in-situ sampling, the success of this new technology led to its implementation on spacecraft, providing an even larger view and automated revisit measurements while in orbit. However, airborne campaigns and spacecraft programs come at a cost. The technology required highly customized and sensitive optics and over time, more and more spectral bands were needed to interpret the results into useful data. By the early 2000’s launch costs were dropping for miniaturized Cube Satellite (Cube-Sat) form factor satellites, but innovation was required to shrink the imagers while retaining critical performance and increasing spectral resolution to new industry requirements.
This thesis presents the methods developed for producing a hyperspectral imager, onboard the Hyperspectral Smallsat for Ocean Observation (HYPSO-1) CubeSat mission, as well as the procedures for verifying its performance before launch. HYPSO-1 was launched into orbit on 13 January 2022 and is one in only a handful of hyperspectral CubeSats operational in orbit today. While its image quality does not exceed that of the full-scale national agency hyperspectral satellites, it provides competitive data at a fraction of the cost. It is fully commanded by the the team at the Norwegian University of Science and Technology (NTNU), providing on-demand algal bloom observations to complement multidisciplinary surveys for ocean science. Its agile operation allows higher temporal resolution and lower data latency compared to other small satellites, for the selected target area in Norway. In addition to describing the methods of production and verification, the thesis also describes the selection of Commercial Off-the-Shelf (COTS) components, modifications required for space, and characterization and calibration of the imager. Thereby, answers are provided for the main research question: What methodologies can be used to efficiently design, build, test, and verify small-scale hyperspectral imaging payloads, capable of detecting and classifying the composition of water masses for ocean science and industry?
Developing this small-scale Hyperspectral Imager (HSI) has provided a two-fold impact. Firstly, the HYPSO-1 HSI directly impacts the university community at NTNU by capturing data in orbit that is now accessible to researchers and students, as well as the general public. Since its launch in the spring of 2022, the satellite has downlinked hundreds of hyperspectral data cubes, or images, on request. Secondly, the methods for developing such an imager are openly available and the process can be duplicated by other interested teams. This thesis provides the methodology for the production and verification of a CubeSat HSI, a proven, low-cost system that is currently fully operational in Low Earth Orbit (LEO)
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
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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