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41.
Duhamel Cécilie Caballero Jacqueline Couvant Thierry Crépin Jérôme Gaslain Fabrice Guerre Catherine Le Hong-Thaï Wehbi Mickaël 《Oxidation of Metals》2017,88(3-4):447-457
Oxidation of Metals - The present work focuses on the intergranular oxidation of Alloy 600 and its weld material Alloy 82 after exposure in simulated primary water at 340–360 °C... 相似文献
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Nicolas Clabaux Thierry BrenacChristophe Perrin Joël MagninBastien Canu Pierre Van Elslande 《Accident; analysis and prevention》2012
Previous research on motorcycle crashes has shown the frequency and severity of accidents in which a non-priority road user failed to give way to an approaching motorcyclist without seeing him/her, even though the road user had looked in the approaching motorcycle's direction and the motorcycle was visible. These accidents are usually called “looked-but-failed-to-see” (LBFS) accidents. This article deals with the effects that the motorcyclist's speed has in these accidents. It is based on the in-depth study and precise kinematic reconstruction of 44 accident cases involving a motorcyclist and another road user, all occurring in intersections. The results show that, in urban environments, the initial speeds of motorcyclists involved in “looked-but-failed-to-see” accidents are significantly higher than in other accidents at intersections. In rural environments, the difference in speed between LBFS accidents and other accidents is not significant, but further investigations would be necessary to draw any conclusions. These results suggest that speed management, through road design or by other means, could contribute to preventing “looked-but-failed-to-see” motorcycle accidents, at least in urban environments. 相似文献
44.
Gabriel Kalyon Tristan Le Gall Hervé Marchand Thierry Massart 《Discrete Event Dynamic Systems》2012,22(2):121-161
We propose algorithms for the synthesis of state-feedback controllers with partial observation of infinite state discrete
event systems modelled by Symbolic Transition Systems. We provide models of safe memoryless controllers both for potentially
deadlocking and deadlock free controlled systems. The termination of the algorithms solving these problems is ensured using
abstract interpretation techniques which provide an overapproximation of the transitions to disable. We then extend our algorithms
to controllers with memory and to online controllers. We also propose improvements in the synthesis of controllers in the
finite case which, to our knowledge, provide more permissive solutions than what was previously proposed in the literature.
Our tool SMACS gives an empirical validation of our methods by showing their feasibility, usability and efficiency. 相似文献
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Damien Trentesaux Cyrille Pach Abdelghani Bekrar Yves Sallez Thierry Berger Thérèse Bonte Paulo Leitão José Barbosa 《Control Engineering Practice》2013,21(9):1204-1225
Benchmarking is comparing the output of different systems for a given set of input data in order to improve the system’s performance. Faced with the lack of realistic and operational benchmarks that can be used for testing optimization methods and control systems in flexible systems, this paper proposes a benchmark system based on a real production cell. A three-step method is presented: data preparation, experimentation, and reporting. This benchmark allows the evaluation of static optimization performances using traditional operation research tools and the evaluation of control system's robustness faced with unexpected events. 相似文献
47.
This paper addresses the problem of navigating in a provably safe manner a mobile robot with a limited field-of-view placed
in a unknown dynamic environment. In such a situation, absolute motion safety (in the sense that no collision will ever take
place whatever happens in the environment) is impossible to guarantee in general. It is therefore settled for a weaker level
of motion safety dubbed passive motion safety: it guarantees that, if a collision takes place, the robot will be at rest. 相似文献
48.
Hassan Al Sabea Lucie Norel Olivier Galangau Thierry Roisnel Olivier Maury Franois Riob Stphane Rigaut 《Advanced functional materials》2020,30(30)
This work describes a class of complex combining three dithienylethene units and a lanthanide ion used as an optical system displaying a double encryption method: i) a colorful code, drawn and erased under UV and visible irradiations respectively, due to coloration and discoloration of the photochromic entities, and ii) a concomitant gradual disappearance and progressive restoration of the associated lanthanide ion luminescence triggered with the same stimuli. The innovation of the system stems from the emission color tunability, i.e., with either a lanthanide ion emitting only in the visible range (Eu3+) or with another lanthanide ion emitting only in the near infrared (NIR) range (Yb3+), therefore observable, or not, to the naked eye. This system is the very first one to achieve efficient repeatable modulation of pure NIR luminescence on photochemical command. Furthermore, it is proven to be highly efficient when embedded in a PDMS polymer opening real opportunities for practical applications as anti‐counterfeiting. 相似文献
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Wet agglomeration mechanisms developing in low shear mixers have been described considering a fractal morphogenesis process that links the median size of the agglomerates with their solid volume fraction via a fractal dimension. It appears fundamental to integrate the polydispersity of the generated structures (nuclei, agglomerates, dough pieces) in the analysis of the agglomeration process in order to approach the industrial problems. The objective of this study is to correlate the influence of the physicochemical characteristics of several liquid binders, on the fractal agglomeration mechanisms. To do so, we considered the values of the fractal model parameters. The obtained results confirmed that semolina wet agglomeration follows a fractal morphogenesis for the different applied liquid binders. Our results also showed a marked influence of the studied physicochemical properties of the liquid binder on the value of the fractal model parameters. During wet agglomeration in low shear mixers, the mechanisms implied during agglomeration (wetting, nucleation and growth) do not occur consecutively, but they coexist throughout at each water contents. 相似文献