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Cette version abrégée est la traduction partielle de la version anglaise de la publication Renforcer la résilience économique après la crise du COVID-19 de l'OCDE. Elle contient le résumé de la publication ainsi que le chapitre 1 du rapport, qui propose une synthèse des enseignements sur la résilience économique des travailleurs, des entreprises et des industries.

Transition flow.

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This paper summarizes the macroeconomic performance of the transition economies. We first review the initial conditions confronting these economies, the reform strategy that was proposed, and the associated controversies that arose a decade ago. We then account for the widely different outcomes, highlighting the role of exogenous factors and the macroeconomic and structural policies adopted by the countries. We find that both stabilization policies and structural reforms, particularly privatization, contribute to growth. We also conclude that the faster is the speed of reforms, the quicker is the recovery and the higher is growth.

Transition flow.

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"Present understanding of transition to turbulence has now been studied over one hundred and fifty years. The path the studies have taken posed it as a modal eigenvalue problem. Some researchers have suggested alternative models without being specific. First-principle based approach of receptivity is the route to build bridges among ideas for solving the Navier-Stokes equation for specific canonical problems. This book highlights the mathematical physics, scientific computing, and new ideas and theories for nonlinear analyses of fluid flows, for which vorticity dynamics remain central. This book is a blend of classic with distinctly new ideas, which establish different dynamics of flows, from genesis to evolution of disturbance fields with rigorously developed methods to tracing coherent structures amidst the seemingly random and chaotic fluid dynamics of transitional and turbulent flows"--

Turbulence --- Transition flow. --- Mathematical models.

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Laminar flow. --- Boundary layer. --- Transition flow.

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This book provides the intermittency equation that is derived a priori. Since the intermittency equation is mathematically obtained, the resulting gamma transition model no longer requires any extra parameters and terms to explicitly account for free-stream turbulence and pressure gradient like the previous transition models. Instead, the present gamma transition model can naturally predict natural transition and effects of free-stream turbulence and pressure gradient on the transition process.

Fluid mechanics --- Gases handling. Fluids handling --- ingenieurswetenschappen --- mechanica --- vloeistoffen --- Transition flow. --- Transition flow