"The ultimate goal of the research would be to enable doctors to use electrocardiograms and ultrasounds for the early detection of congenital heart disease. It may also be possible to use techniques such as microfluidic surgery to correct problems in heart chamber and valve formation," Miller says.
Miller will describe the heart models in her talk, "Fluid-structure interaction and electrophysiology of the embryonic heart," at 10:43 am on Sunday, November 23, 2008, in Room 103A of the San Antonio Convention Center. Abstract: http://meetings.aps.org/Meeting/DFD08/Event/89766.
8) UNLOCKING THE MYSTERY OF MARTIAN SAND RIPPLES
When the Mars Exploration Rover Opportunity landed on fresh Martian sand ripples in 2004, its on-board microscope showed the grains there to be much finer than predicted, revealing a major mystery to be solved. As on Earth, Mars' famous dust storms loft the finest particles high into the atmosphere, while coarser particles bounce along the surface, forming ripples and dunes. Well-established theories developed for Earth ripples in air and water and extended to Martian surface conditions predicted that the transitional particle diameter between these behaviors on Mars would four times that of Earth's. Yet they were essentially the same. Why was the established theory wrong for Mars?
Numerical simulations performed by a team at Cornell University now suggest a plausible answer. It turns out that the combination of the Martian atmosphere's low density -- 100 times less than Earth's -- and the higher wind speeds necessary to move grains of any size on Mars conspire to make Martian winds less effective than Earth's in lifting particles high into the air. The simulations showed why: Particles react more slowly to an upward turbulent eddy on Mars (due to low atmospheric density) and the e
|Contact: Jason Bardi|
American Institute of Physics