2,293 research outputs found
Afropean Journeys: A Conversation with E.C. Osondu
No full textNigeria-born and US resident author E.C. Osondu debuted with the short story collection Voice of America (2010), followed by the novel This House is Not for Sale (2015) and Alien Stories (2020). His latest novel, When the Sky is Ready the Stars Will Appear, the compelling tale of an African boy’s journey towards Rome in search of a better life, was first published in translation in Italy with the title Quando il cielo vuole spuntano le stelle (2020). Only one year later, the original version of the novel was published in Nigeria. This piece, based on a conversation with the author within the context of the “Afropean Bridges” 2021 Series, introduces E.C. Osondu and his works to the Italian audience
Ships Observing Marine Climate: a catalogue of the VOS participating in the VSOP-NA
No full textOur present knowledge of the marine climate, as represented by data sets such as COADS (Woodruff et al., 1987), is based on meteorological observations from the Voluntary Observing Ships (VOS). Because the VOS are merchant ships, rather than specially designed meteorological platforms, errors and biases exist in the data. However there is little information readily available to the climatologist either on the nature of the VOS fleet or on the observing practises which are used. This report, describing the forty-six ships that participated in the Voluntary Observing Ships' Special Observing Project - North Atlantic (VSOP-NA), therefore serves two purposes:(i) it provides a reference document to aid analysis of the VSOP-NA data set,(ii) it gives a detailed description of a subset of the VOS, which will be of value in the interpretation of marine climate data sets.This report is in two parts, Part 1 is an overall summary of the ship characteristics, Part 2 is a ship by ship description. The next section will briefly describe the VSOP-NA project, followed by a summary of the characteristics of the VSOP-NA ships (Section 3). Since these ships were specially selected (Section 2.2), the degree to which they are representative of the whole VOS fleet will be carefully considered. The meteorological instrumentation used by the VOS varies depending on which meteorological agency recruited the ships. That used on the chosen VSOP-NA ships is typical of VOS recruited by the countries bordering the North Atlantic, and will be described in Section 4. Section 5 is a summary of Part 1 of the report.Part 2 presents the VSOP-NA ship catalogue. This includes, for each ship, diagrams of the layout (indicating in particular the exposure of the sensors), a summary of the geographical positions at which observations were obtained, and details of the instrumentation used.<br/
Services in Europe: a policy for the '90s. Europe: Magazine of the European Community No. 263, January-February 1987
No full textCurvature and the visual perception of shape: Theory on information along object boundaries and the minima rule revisited.
No full textPrevious empirical studies have shown that information along visual contours is known to be concentrated in regions of high magnitude of curvature, and, for closed contours, segments of negative curvature (i.e., concave segments) carry greater perceptual relevance than corresponding regions of positive curvature (i.e., convex segments). Lately, Feldman and Singh (2005, Psychological Review, 112, 243�252) proposed a mathematical derivation to yield information content as a function of curvature along a contour. Here, we highlight several fundamental errors in their derivation and in its associated implementation, which are problematic in both mathematical and psychological senses. Instead, we propose an alternative mathematical formulation for information measure of contour curvature that addresses these issues. Additionally, unlike in previous work, we extend this approach to 3-dimensional (3D) shape by providing a formal measure of information content for surface curvature and outline a modified version of the minima rule relating to part segmentation using curvature in 3D shape
Comprehensive approaches to differentiation of future climate commitments - some options compared
No full textA comparison of data-driven internal multiple elimination strategies and their consequences for imaging
No full textWe compare two data-driven internal multiple reflection elimination schemes derived from regular Marchenko equations and Inverse Scattering Series (ISS). The scheme derived from regular Marchenko equations creates a new data set without internal multiple reflections. The scheme derived from ISS is equal to the result after the second iteration of the Marchenko-based scheme. It can attenuate internal multiple reflections with residuals. We evaluate the success of two schemes with a 2D complex numerical example. It is shown that Marchenko-based data-driven scheme is relatively more robust for internal multiple reflection elimination.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Applied Geophysics and Petrophysic
Análisis de las dos líneas de transmisión del tratado de Tudmīr (94 H./713 e.C.)
No full textThe two main texts of the transmission lines of the treaty of Tudmīr (94 H/713 e.C. ), included by al- ‘Uḏrī and al-Ḍabbī in their respective works, are edited and translated on the basis of an new reading of the manuscripts that contain them, and after that, we reach some conclusions about its process of copy. There are compared the two texts, and are listed its textual differences. As conclusion, we propose that Al- ‘Uḏrī’s text is the oldest, because its author has copied them from the original document of the 8th. c. (or a copy transfer of this). The transmission of al-Ḍabbī is more recent and it was based in an oral transmission of the text.Análisis de las dos líneas de transmisión del tratado de Tudmīr (94 H./713 e.C.)Los dos textos principales de las líneas de transmisión del tratado de Tudmīr (94 H/713 e.C.), incluidos por al-‘Uḏrī y al-Ḍabbī en sus respectivas obras, son editados y traducidos en base a la relectura de los manuscritos que los contienen y de ello se extraen una serie de conclusiones sobre su proceso de copia. Luego son comparados los dos textos entre sí y se enumeran una serie de diferencias textuales. Finalmente, como hipótesis interpretativa se propone que el texto de al-‘Uḏrī es el más antiguo, y habría sido copiado de un traslado del original por su autor, mientras que la transmisión de al-Ḍabbī habría sido más reciente y se habría fundado en otra fuente más antigua que habría puesto por escrito un relato oral del texto
A study of phytochrome, its isolation, structure and photochemical transformations
No full textApplied Science
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