6,241 research outputs found
DYNAMO: Distributed leisure yacht-carried sensor-network for atmosphere and marine data crowdsourcing applications
No full textData crowdsourcing is a increasingly pervasive and lifestyle-changing technology, due to the flywheel effect that results from the interaction between the internet of things and cloud computing. In smart cities, for example, many initiatives harvest valuable data from citizen sensors. However, this paradigm has not seen significant use in coastal and marine monitoring and management due to the challenges of the marine environment. In this work, we describe how this situation can be overcome via the adoption of an open technology ecosystem that provides leisure vessels with a platform for on-board data acquisition, storage, and processing, leveraging off-the-shelf mobile technologies. We introduce DYNAMO, a infrastructure designed to collect marine environmental data from a distributed sensor network carried by leisure vessels. The resulting crowdsourced data can be used to improve operational weather and marine predictions via the use of data assimilation methods. We show our preliminary results about the DYNAMO Daemon, a SignalK server we embedded in the native level of the Android operating system enabling the data gathering and transfer from vessels to the cloud
A fast, secure, reliable, and resilient data transfer framework for pervasive IoT applications
No full textThe number of online devices with on board sensors is growing steadily in the last years, leading to many solutions depending on data crowd-sourcing. In these scenarios, usually the collected data need to be transferred on a cloud infrastructure, where can later be aggregated and analyzed using specialized data processing algorithms. The simple task of data transfer becomes a problem in stressed environments such as space communication systems, drone monitoring or marine ecosystems, where the network connectivity is unstable and not available for long period of times. In this paper, we propose a novel Internet of Things (IoT) data transfer framework for cloud-based applications in delay tolerant environments. The framework implements a protocol that is i) elastic, taking advantage of short connection times; ii) lightweight, which makes it suitable for IoT devices; and iii) secure, which makes it a good choice also for applications with sensitive data. We evaluate the framework in a real system with a marine navigation application, demonstrating its benefits in terms of performance, resiliency, and security
Computational Techniques
No full textThis chapter introduces fundamental computational approaches and ideas to energy materials. These can be divided into two main streams: one dealing with the motion of atoms or ions described at a simplified level of theory and another focusing on electrons. The modeling framework, which covers both streams, is outlined. The atomistic simulation techniques discussed in the chapter are concerned with describing the energy landscape of individual atoms or ions, where classical mechanics can be usefully employed as the first successful approximation. Multiscale approaches could be the method of choice if one is interested in large molecules, inhomogeneous solids, complex environments or geometrical arrangements, systems that are far away from equilibrium or have particularly long evolution times. One of the principal objectives of atomistic simulations is to derive an accurate and coherent approach to the prediction of defect structure, energetics and properties. Two of the most widely employed methods are outlined. This edition first published 2013 © 2013 John Wiley & Sons, Ltd
COMMERCIAL 584\AA PHOTOELECTRON SPECTROMETER
No full textAuthor Institution: Perkin-Elmer LimitedThe design of a commercial 584\AA Photcelectron Spectrometer will be discussed together with some recent research problems investigated by this technique
Open Access to Peer-Reviewed Research through Author/Institution Self-Archiving: Maximizing Research Impact by Maximizing Online Access
No full textAll refereed journals will soon be available online; most of them already are. This means that anyone will be able to access them from any networked desk-top. The literature will all be interconnected by citation, author, and keyword/subject links, allowing for unheard-of power and ease of access and navigability. Successive drafts of pre-refereeing preprints will be linked to the official refereed draft, as well as to any subsequent corrections, revisions, updates, comments, responses, and underlying empirical databases, all enhancing the self-correctiveness, interactivity and productivity of scholarly and scientific research and communication in remarkable new ways. New scientometric indicators of digital impact are also emerging <http://opcit.eprints.org> to chart the online course of knowledge. But there is still one last frontier to cross before science reaches the optimal and the inevitable: Just as there is no longer any need for research or researchers to be constrained by the access-blocking restrictions of paper distribution, there is no longer any need to be constrained by the impact-blocking financial fire-walls of Subscription/Site-License/Pay-Per-View (S/L/P) tolls for this give-away literature. Its author/researchers have always donated their research reports for free (and its referee/researchers have refereed for free), with the sole goal of maximizing their impact on subsequent research (by accessing the eyes and minds of fellow-researchers, present and future) and hence on society. Generic (OAi-compliant) software is now available free so that institutions can immediately create Eprint Archives in which their authors can self-archive all their refereed papers for free for all forever <http://www.eprints.org/>. These interoperable Open Archives <http://www.openarchives.org> will then be harvested into global, jointly searchable "virtual archives" (e.g., <http://arc.cs.odu.edu/>). "Scholarly Skywriting" in this PostGutenberg Galaxy will be dramatically (and measurably) more interactive and productive, spawning its own new digital metrics of productivity and impact, allowing for an online "embryology of knowledge.
Author attribution using profile classifiers
No full textA atribuição autoral (AA) busca identificar um autor de texto a partir de um conjunto de autores conhecidos. Autores deixam rastros em seus textos e é possível identificar características sociolinguísticas baseadas no estilos de escrita refletidos no texto destes autores. A atribuição autoral está cada vez mais demonstrando importância para diversas atividades sociais, em especial para a análise forense. Os trabalhos envolvendo AA demonstram resultados modestos e motivam a exploração de diferentes técnicas para melhorar a acurácia dos modelos atuais. A partir desses pontos, o presente trabalho apresenta uma proposta de pesquisa em nível de mestrado no campo de processamento de língua natural (PLN), com ênfase em AA, com o objetivo geral de melhorar o desempenho de classificadores de atribuição autoral utilizando técnicas de caracterização autoral (CA)Author attribution (AA) seeks to identify a text author from a set of known authors. Authors leave traces in their texts and it is possible to identify sociolinguistic characteristics based on the writing styles reflected in the text of these authors. Author attribution is increasingly showing importance for various social activities, especially forensic analysis. Studies involving AA show modest results and motivate the exploration of different techniques to improve the accuracy of current models. From these perspective, this project presents a master\'s level research proposal in the field of natural language processing (NLP), with an emphasis in AA, with the general objective of improving the performance of AA classifiers using author profiling technique
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Observations of the 57Fe+23 hyperfine transition in clusters of galaxies
No full textWe present a search for the hyperfine transition of the 57Fe+23 ion at 3.071 mm in clusters of galaxies with the ATNF Mopra telescope. The results are compared with a realistic estimate of the peak brightness temperature of the line in a cooling flow cluster A85, using the available X-ray data
THE ANALYSIS OF FIVE ELECTRONIC EMISSION SYSTEMS OF NIOBIUM NITRIDE (NbN) IN THE REGION 5000{\AA} – 6200{\AA}
No full textK. H. Rao and T. M. Dunn, Nature 222, 266 (1969). J. L. Femenias, C. Athenour, and T. M. Dunn, J. Chem. Phys. 63, 2861 (1975).Author Institution:Niobium nitride emission systems have been found at 5l37{\AA}, 5582{\AA}, 5740{\AA}, 5840{\AA}, 5860{\AA}, in addition to the already systems with subbands at 5930{\AA}, 6043{\AA}, and 6192{\AA}. Most of These systems show marked nuclear hyperfine structure of the rotational lines add this has been of assistance in the analysis of all of the systems. Systems of triplet-triplet, singlet-singlet and singlet-triplet are all present and the hyperfine structure also allows assignment of the ground and excited state electron configuration to be made with some confidence
THE 4550 {\AA} BAND SYSTEM OF GLYOXAL
No full textAuthor Institution: Division of Pure Physics, National Research Council“Approximately 45 bands of glyoxal in the region 4000-4660 {\AA} have been photographed in absorption using a 30 ft. Ebert spectrograph with a resolving power of and a dispersion of 1.3 {\AA}/cm. The (0-0) baud near 4550 {\AA}, which WAS studied at a temperature of C, shows fairly well-resolved J- and K- structure characteristic of a perpendicular hand of a near symmetric top molecule. The rotational and vibrational analysis of the speetrum will be discussed.
THE ABSORPTION SPECTRUM OF SODIUM VAPOR FROM 1040{\AA} TO 3500 {\AA}
No full textR. W. Ditchburn and R. D. Hudson, Proc, Roy. SOC. A256, 53 (1960). R. W. Ditchburn, P. J. Jutsum and G. V. Marr, Proc. Roy. Soc. A219, 89 (1953).Author Institution: Space Physics Laboratory, Aerospace Corporation“The absorption of ultraviolet radiation by sodium vapor, and the associated ionization, has been investigated from 1040{\AA} to 3500{\AA} using a two-metre McPherson normal incidence spectrometer and an absorption chamfer of the type described by Ditchburn and The atomic cross section at the series limit (2412 {\AA}) was found to be , in good agreement with the previous result obtained by Ditchburn, Jutsum and The atomic cross section decreases to a minimum at 1900{\AA} and then increases again towards shorter wavelengths. Continuous molecular absorption was observed from 3500{\AA} to 1700{\AA} and ion chamber measurement indicate that this absorption is due to an ionization continuum. Ion current peaks were also seen between 2413{\AA} and 3500{\AA} at wavelengths corresponding to the series absorption lines of the sodium atom. Curves will be presented showing the variation with wavelength of both the atomic cross section and the relative molecular cross section.
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