منابع مشابه
The booming Medicaid market.
D entistry is in the midst of a major transition. One key driver of change is the Affordable Care Act (ACA), which has many provisions relevant to the dental care sector. A key provision of the ACA is Medicaid expansion, which has the potential to reshape the dental benefits landscape considerably. Let’s first look at trends in Medicaid before ACA. For more than a decade, public health insuranc...
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Booming dunes” are large desert sand dunes that make a loud droning or humming noise during an avalanching of sand. The phenomenon has been observed for censturies, yet it remains largely unexplained. This note demonstrates that the booming frequency does not scale with the size of the particle or with the shearing speed of the avalanching sand. Instead, the dune may act as a waveguide with a f...
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ژورنال
عنوان ژورنال: Nature
سال: 2009
ISSN: 0028-0836,1476-4687
DOI: 10.1038/461577a