1,721,627 research outputs found
Geospatial methods and tools for natural risk management and communications
Full text linkIn the last decade, real-time access to data and the use of high-resolution spatial information have provided scientists and engineers with valuable information to help them understand risk. At the same time, there has been a rapid growth of novel and cutting-edge information and communication technologies for the collection, analysis and dissemination of data, re-inventing the way in which risk management is carried out throughout its cycle (risk identification and reduction, preparedness, disaster relief and recovery). The applications of those geospatial technologies are expected to enable better mitigation of, and adaptation to, the disastrous impact of natural hazards. The description of risks may particularly benefit from the integrated use of new algorithms and monitoring techniques. The ability of new tools to carry out intensive analyses over huge datasets makes it possible to perform future risk assessments, keeping abreast of temporal and spatial changes in hazard, exposure, and vulnerability. The present special issue aims to describe the state-of-the-art of natural risk assessment, management, and communication using new geospatial models and Earth Observation (EO)architecture. More specifically, we have collected a number of contributions dealing with: (1) applications of EO data and machine learning techniques for hazard, vulnerability and risk mapping; (2) natural hazards monitoring and forecasting geospatial systems; (3) modeling of spatiotemporal resource optimization for emergency management in the post-disaster phase; and (4) development of tools and platforms for risk projection assessment and communication of inherent uncertainties
Classical and Quantum -Algebras and Applications to Hamiltonian Equations
No full textWe start by giving an overview of the four fundamental physical theories, namely classical mechanics, quantum mechanics, classical field theory and quantum field theory, and the corresponding algebraic structures, namely Poisson algebras, associative algebras, Poisson vertex algebras and vertex algebras. We then focus on classical and quantum algebras, with a particular emphasis on their application to integrable Hamiltonian PDE
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
Generators of the quantum finite W-algebras in type A
No full textWe prove a conjecture proposed in [A. De Sole, V. G. Kac and D. Valeri, Finite W-algebras for N, Adv. Math. 327 (2018) 173-224.] describing the Lax type operator L(z) for the quantum finite W-algebras of N in terms of a PBW generating system for the W-algebra. In doing so, we extend this result to an arbitrary good grading and an arbitrary isotropic subspace of [1 2]
Paleoenvironmental significance of Middle-Upper Pleistocene alluvial and lacustrine deposits of Mercuri basin (souther Italy).
No full textThe late Quaternary evolution of the Mercure paleolacustrine basin (Lucanian Apennines, southern Italy) was reconstructed through a multidisciplinary approach. In particular, here are presented the results of stratigraphical, geomorphological and palynological analysis of the fluvio-lacustrine sedimentary succession, which is Middle-Upper Pleistocene in age. The Mercure paleolacustrine basin, about 50 km2 wide, is located at the Calabria-Lucania boundary. The modern valley floor lies at 300 m asl and the sorrounding mountain tops reach 2000 m to the south and 1300/1500 to the north of the basin. The reconstruction of the sedimentary succession of the Mercure basin allows the definition of three main phases of the basin filling which occurred during the Middle-Upper Pleistocene time. The first sedimentary phase (Middle Pleistocene) is characterised by alluvial facies, which grade basinward into deltaic and lacustrine deposits. The second phase of filling (Middle-Upper? Pleistocene) consists of alternating sand-silty deposits passing upward to carbonate silts. After a dissecting phase, probably occurred during the Last Glacial Period, less widespread alluvial deposition took place at the basin margin; in particular the Upper Pleistocene deposits are telescopically inset within previous valley-side perched alluvial and lacustrine terraces, preserved as hanging remnants, gently sloping basinward. Pollen analysis was performed on the carbonate silts of the second filling phase. Two outcrops of about 12 and 16 metres were sampled at Zarafa and Sorgente Mercure. They represent the slopes of lacustrine terraces whose tops is now located up to 600 m asl. On the whole, pollen spectra reveal the existence of a very luxuriant oak forest, with Carpinus and Ulmus as main secondary elements, typical of a warm-humid interglacial period. The constant presence of Zelkova in the deciduous forest and the co-existence of Abies and Fagus in the highest forested belt suggests a late-Middle Pleistocene age for this interglacial association. In particular this interglacial should correspond to IS 7 or 5. An interglacial period corresponding to stage 9 was recognised at Acerno in the Picentini massif (Munno et al., 2001). Here the forest association was not very different but the presence of Cedrus suggests an older age for this paleolake. No other exemples of stage 7 or 5 are available in southern Apennines paleolakes
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
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