875 resultados para road and traffic sign
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This chapter focuses on possible effects of current R&D policies in the scientific work, exploring some of the dilemmas they cause to researchers. In a transnational scale, R&D policies embrace performance-based research funding systems, calling for a growing accountability and a more useful and published research. Often justified by the importance of knowledge in public policies or as part of the new managerialism regime, these trends emphasize performativity on research. In this scenario, how researchers receive and interpret R&D policies is influenced according to their values and interests? Do they play the game or do they get played by it? These questions rely on a conceptual framework that conceives the research as a political scene, where researchers and R&D policies meet. Moreover, researchers’ strategies are perceived as political, considering that it is in the context of the practices that policy is interpreted and reinvented. The chapter presents an empirical study conducted in Portugal, which will be taken as an example of what Waitere et al (2011) already named as “choosing whether to resist or reinforce” R&D policies. In fact, the study revealed a strategic calculation made by researchers and the coexistence of convergent and divergent strategies concerning R&D policies. I will argue that the tensions in this strategic game are both a reflex and generator of the dilemmas of scientific work today and a sign of the complexity of public policies.
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Ce mémoire a été effectué dans le cadre d'une étude pour le Ministère des Transports.
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We perform density functional calculations to investigate the structure of the intermetallic alloy FeRh under epitaxial strain. Bulk FeRh exhibits a metamagnetic transition from a low-temperature antiferromagnetic (AFM) phase to a ferromagnetic phase at 350 K, and its strain dependence is of interest for tuning the transition temperature to the room-temperature operating conditions of typical memory devices. We find an unusually strong dependence of the structural energetics on the choice of exchange-correlation functional, with the usual local density approximation yielding the wrong ground-state structure, and generalized gradient (GGA) extensions being in better agreement with the bulk experimental structure. Using the GGA we show the existence of a metastable face-centered-cubic-like AFM structure that is reached from the ground-state body-centered-cubic-like AFM structure by following the epitaxial Bain path. We show that the behavior is well described using nonlinear elasticity theory, which captures the softening and eventual sign change of the orthorhombic shear modulus under compressive strain, consistent with this structural instability. Finally, we predict the existence of an additional unit-cell-doubling lattice instability, which should be observable at low temperature.
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Ce mémoire a été effectué dans le cadre d'une étude pour le Ministère des Transports.
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National Highway Traffic Safety Administration, Office of Research and Traffic Records, Washington, D.C.
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Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.
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Federal Highway Administration, Office of Safety and Traffic Operations, Washington, D.C.
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Arizona Department of Transportation, Phoenix
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Mode of access: Internet.
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Includes bibliographies.
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National Highway Traffic Safety Administration, Office of Research and Traffic Records, Washington, D.C.
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National Highway Traffic Safety Administration, Washington, D.C.
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Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.
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Federal Highway Administration, Office of Safety and Traffic Operations Research Development, McLean, Va.
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Federal Highway Administration, Office of Safety and Traffic Operations Research Development, McLean, Va.