1,720,957 research outputs found
Making Geochemical Microanalytical Imagery Accessible and Reusable
No full textThe production and use of 2D and 3D imagery in geochemistry and cosmochemistry is becoming pervasive due to advancements in analytical instrumentation that can quantitatively measure elemental concentrations and isotopic compositions of samples in-situ across large areas or at increasingly higher spatial resolution with methods such as scanning electron microscopy (SEM), electron microprobe (EMP), secondary ion mass spectrometry (SIMS), transmission electron microscopy (TEM) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Complimenting and extending precise point analysis, these techniques now produce quantitative maps, which connect geochemical and textural data of the mineral phases in a sample. This combination of spatial imaging with microanalysis of features such as chondrules, melt inclusions, and the matrix results in a complete contextual understanding of a sample.
Current geochemistry data repositories are generally not equipped to host large volumes of images or provide users with tools to work with these images. There are however a growing number of domain specific repositories related to specific techniques (ex. x-ray computed tomography) or research fields (ex. meteoritics). Further, there are a growing number of commercial and research led software tools for exploring and comparing images in a given repository (i.e. SAMIS associated with OSIRIS-Rex or Zeiss Data Explorer). The increase in specialist repositories and query tools means that the microscopy data is now more Findable and potentially Interoperable than at any earlier time. In this presentation we will discuss the need to develop standards around the storage of microscopy data and its associated metadata in open file formats to ensure that these repositories are sharing data which is Accessible and Reusable
Making Geochemical Microanalytical Imagery Accessible and Reusable
No full textThe production and use of 2D and 3D imagery in geochemistry and cosmochemistry is becoming pervasive due to advancements in analytical instrumentation that can quantitatively measure elemental concentrations and isotopic compositions of samples in-situ across large areas or at increasingly higher spatial resolution with methods such as scanning electron microscopy (SEM), electron microprobe (EMP), secondary ion mass spectrometry (SIMS), transmission electron microscopy (TEM) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Complimenting and extending precise point analysis, these techniques now produce quantitative maps, which connect geochemical and textural data of the mineral phases in a sample. This combination of spatial imaging with microanalysis of features such as chondrules, melt inclusions, and the matrix results in a complete contextual understanding of a sample.
Current geochemistry data repositories are generally not equipped to host large volumes of images or provide users with tools to work with these images. There are however a growing number of domain specific repositories related to specific techniques (ex. x-ray computed tomography) or research fields (ex. meteoritics). Further, there are a growing number of commercial and research led software tools for exploring and comparing images in a given repository (i.e. SAMIS associated with OSIRIS-Rex or Zeiss Data Explorer). The increase in specialist repositories and query tools means that the microscopy data is now more Findable and potentially Interoperable than at any earlier time. In this presentation we will discuss the need to develop standards around the storage of microscopy data and its associated metadata in open file formats to ensure that these repositories are sharing data which is Accessible and Reusable
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
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Applications of the uranium decay systems in deep time and the Quaternary: chronologic insights within planetary interiors and beneath glaciers
Get PDFIsotopes of uranium and their radioactive decay products are important timekeepers for geologic and planetary processes, capable of recording precise dates across an enormous range of timescales and environments. This dissertationencompasses four distinct studies that employ the U decay systems to explore both time and physical processes in various geologic and planetary systems. While the focus of the chapters vary in both geologic and temporal setting, the studies fall under a unifying theme of pairing geochronologic methods with models that relate chronologies to Earth system and asteroidal processes.The first two chapters use U-Pb thermochronology to measure high-temperature cooling processes in deep time (million-to-billion-year timescales). The first chapter interprets the cooling dates of U-Pb thermochronometers from middle-to-lower crustal xenoliths with thermal models to reconstruct the thermal history of the Superior craton, constraining the timing, temperature, and lithospheric response of the region to mantle plume heating 1.1 billion years ago. The second chapter interprets Pb-Pb cooling dates of phosphate minerals in LL ordinary chondrites with thermal models to reconstruct the size and timeframes of accretion of the LL parent planetesimal, revealing a large (>150 km diameter) asteroidal body that accreted rapidly after the formation of its constituent chondrule particles.The latter chapters use intermediate decay products of the ²³⁸U-series to explore subglacial conditions over the Pleistocene. The third chapter explores physical and chemical weathering processes in the hyperarid polar environment of Taylor Valley, Antarctica and confirms that Taylor Glacier actively comminutes sediment at its base, challenging canonical assumptions that glaciers in the McMurdo Dry Valleys are non-erosive. The fourth chapter dates subglacial melting events beneath the northern Laurentide Ice Sheet and reveals their coincidence with Heinrich events, recurring episodes of voluminous iceberg discharge into the North Atlantic during the last glacial period. This terrestrial record of basal ice sheet processes corroborates subsurface ocean warming as the primary stimulus for Heinrich events and identifies subglacial aquifers and permafrost as important reservoirs involved in deglacial perturbations of the Atlantic Ocean uranium budget.Collectively, the studies herein span timeframes that exceed the age of the Earth and peer into deep planetary interiors as well as the geosphere-cryosphere interface, each applying U decay systems in distinct ways to explore both geologic time and process
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