970 resultados para Engineer
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Since the Muslim Brotherhood rule was toppled in July 2013, the regime of President Abd al-Fattah al-Sisi has strived to consolidate his one-man rule; he painted the political opposition and civil society as traitors and foreign agents and exploited the fight against terrorism to suppress freedom of expression, justify a crackdown on the press, eclipse justice in courtrooms, throw thousands in prison, and tighten his grip on police forces. The regime has postponed parliamentary elections for some time, while it marginalised and weakened the non-Islamist political parties that helped Sisi take power. He did so by promoting electoral lists with candidates who are loyal to the president, to ensure control over the new assembly and by obstructing any political alliance that could form an opposition. At the same time, the security apparatus has been given free rein to control the public sphere and engineer the electoral process. This may ultimately lead to a parliament that includes no advocates for rights and liberties, which is particularly significant since the incoming assembly will review the huge amount of legislation that President Sisi has issued in the absence of a parliament. In addition, shortly before elections, President Sisi raised questions about the constitution, calling for it to be amended to reduce the powers of the parliament and increase those of the president. It is thus clear that Sisi seeks not only to consolidate his regime, without political opposition, but to free his rule of any effective oversight from society or parliament.
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Abstract Imprecise manipulation of source code (semi-parsing) is useful for tasks such as robust parsing, error recovery, lexical analysis, and rapid development of parsers for data extraction. An island grammar precisely defines only a subset of a language syntax (islands), while the rest of the syntax (water) is defined imprecisely. Usually water is defined as the negation of islands. Albeit simple, such a definition of water is naive and impedes composition of islands. When developing an island grammar, sooner or later a language engineer has to create water tailored to each individual island. Such an approach is fragile, because water can change with any change of a grammar. It is time-consuming, because water is defined manually by an engineer and not automatically. Finally, an island surrounded by water cannot be reused because water has to be defined for every grammar individually. In this paper we propose a new technique of island parsing —- bounded seas. Bounded seas are composable, robust, reusable and easy to use because island-specific water is created automatically. Our work focuses on applications of island parsing to data extraction from source code. We have integrated bounded seas into a parser combinator framework as a demonstration of their composability and reusability.
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Les compositions musicales de l’étudiante qui accompagne cette thèse sous la forme d’un disque audio est disponible au comptoir de la Bibliothèque de musique sous le titre : Cristina García Islas (http://atrium.umontreal.ca/notice/UM-ALEPH002385786)
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The interaction between fluid seepage, bottom water redox, and chemosynthetic communities was studied at cold seeps across one of the world's largest oxygen minimum zones (OMZ) located at the Makran convergent continental margin. Push cores were obtained from seeps within and below the core-OMZ with a remotely operated vehicle. Extracted sediment pore water was analyzed for sulfide and sulfate concentrations. Depending on oxygen availability in the bottom water, seeps were either colonized by microbial mats or by mats and macrofauna. The latter, including ampharetid polychaetes and vesicomyid clams, occurred in distinct benthic habitats, which were arranged in a concentric fashion around gas orifices. At most sites colonized by microbial mats, hydrogen sulfide was exported into the bottom water. Where macrofauna was widely abundant, hydrogen sulfide was retained within the sediment. Numerical modeling of pore water profiles was performed in order to assess rates of fluid advection and bioirrigation. While the magnitude of upward fluid flow decreased from 11 cm yr**-1 to <1 cm yr**-1 and the sulfate/methane transition (SMT) deepened with increasing distance from the central gas orifice, the fluxes of sulfate into the SMT did not significantly differ (6.6-9.3 mol m**-2 yr**-1). Depth-integrated rates of bioirrigation increased from 120 cm yr**-1 in the central habitat, characterized by microbial mats and sparse macrofauna, to 297 cm yr**-1 in the habitat of large and few small vesicomyid clams. These results reveal that chemosynthetic macrofauna inhabiting the outer seep habitats below the core-OMZ efficiently bioirrigate and thus transport sulfate down into the upper 10 to 15 cm of the sediment. In this way the animals deal with the lower upward flux of methane in outer habitats by stimulating rates of anaerobic oxidation of methane (AOM) with sulfate high enough to provide hydrogen sulfide for chemosynthesis. Through bioirrigation, macrofauna engineer their geochemical environment and fuel upward sulfide flux via AOM. Furthermore, due to the introduction of oxygenated bottom water into the sediment via bioirrigation, the depth of the sulfide sink gradually deepens towards outer habitats. We therefore suggest that - in addition to the oxygen levels in the water column, which determine whether macrofaunal communities can develop or not - it is the depth of the SMT and thus of sulfide production that determines which chemosynthetic communities are able to exploit the sulfide at depth. We hypothesize that large vesicomyid clams, by efficiently expanding the sulfate zone down into the sediment, could cut off smaller or less mobile organisms, as e.g. small clams and sulfur bacteria, from the sulfide source.
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Federal Highway Administration, Office of Research, Development and Technology, Washington, D.C.
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Federal Highway Administration, Office of Research, Development and Technology, Washington, D.C.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Includes bibliographical references.
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Final report; August 1977.
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Prepared by Soils and Pavements Laboratory, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Miss., under contract no. PO 4-1-0195.
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The first edition has title: Azimuth tables ... By Lieutenant S. Schroeder ... and Master W. H. H. Southerland ... Washington, Govt. print. off., 1882.
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"June 1977."
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"June 1977."