The COVID-19 pandemic and its social and health impact have underscored the need for a new strategic science agenda for public health. To optimize public health impact, high-quality strategic science addresses scientific gaps that inform policy and guide practice. At least 6 scientific gaps emerge fromthe US experience with COVID-19: health equity science, data science and modernization, communication science, policy analysis and translation, scientific collaboration, and climate science. Addressing these areas within a strategic public health science agenda will accelerate achievement of public health goals. Public health leadership and scientists have an unprecedented opportunity to use strategic science to guide a new era of improved and equitable public health. (Am J Public Health. Published online ahead of print July 1, 2021: e1–e8. https://doi.org/10.2105/AJPH.2021.306355 )
We describe in this paper the improvement on the numerical resolution of a fluid dynamics system by means of an Adaptive Mesh Refinement algorithm in order to handle an infinitely thin interface. This model is derived from the compressible Navier-Stokes equations in the case of diphasic flows for which both phases have a low Mach number. It consists of a coupled hyperbolic-elliptic system. The first part is numerically treated thanks to a hierarchical grid structure whereas we use the Local Defect Correction method to solve the second part.
Liquid Metal Fast Breeder Reactor pipe systems typically utilize a thicker insulation package than that used on water plant pipe systems. They are supported with special insulated pipe clamps. Mechanical snubbers are employed to resist seismic loads. Recent laboratory testing has indicated that these features provide significantly more damping than presently allowed by Regulatory Guide 1.61 for water plant pipe systems. This paper presents results of additional in-situ vibration tests conducted on Fast Flux Test Facility pipe systems. Pipe damping values obtained at various excitation levels are presented. Effects of filtering data to provide damping values at discrete frequencies and the alternate use of a single equivalent modal damping value are discussed. These tests further confirm that damping in typical LMFBR pipe systems is larger than presently used in pipe design. Although some increase in damping occurred with increased excitation amplitude, the effect was not significant. Recommendations are made to use increased damping values for seismic events in design of heavily insulated pipe systems.
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