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https://www.readbyqxmd.com/read/20365642/dynamic-properties-of-unstable-motion-of-swirling-premixed-flames-generated-by-a-change-in-gravitational-orientation
#1
Hiroshi Gotoda, Takaya Miyano, Ian G Shepherd
The dynamic behavior of swirling premixed flames generated by the effect of the gravitational orientation has been experimentally and numerically investigated. When the gravitational direction relative to the flame front is changed, i.e., in inverted gravity (-1G), an unstable flame is formed in a limited domain of equivalence ratio and swirl number. The time history of flame front fluctuation shows that high-energy chaotic motion is superimposed on a periodic oscillation generated by unstable vortex motion in the combustion products...
February 2010: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
https://www.readbyqxmd.com/read/16916937/swimming-paramecium-in-magnetically-simulated-enhanced-reduced-and-inverted-gravity-environments
#2
Karine Guevorkian, James M Valles
Earth's gravity exerts relatively weak forces in the range of 10-100 pN directly on cells in biological systems. Nevertheless, it biases the orientation of swimming unicellular organisms, alters bone cell differentiation, and modifies gene expression in renal cells. A number of methods of simulating different strength gravity environments, such as centrifugation, have been applied for researching the underlying mechanisms. Here, we demonstrate a magnetic force-based technique that is unique in its capability to enhance, reduce, and even invert the effective buoyancy of cells and thus simulate hypergravity, hypogravity, and inverted gravity environments...
August 29, 2006: Proceedings of the National Academy of Sciences of the United States of America
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