Comparison of experiments on bio-inspired hover kinematics with the unsteady vortex model and CFD

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106510/1/AIAA2013-66.pd

Spatial heterogeneity in the radiogenic activity of the lunar interior: Inferences from CHACE and LLRI on Chandrayaan-1

In the past, clues on the potential radiogenic activity of the lunar interior have been obtained from the isotopic composition of noble gases like Argon. Excess Argon (40) relative to Argon (36), as compared to the solar wind composition, is generally ascribed to the radiogenic activity of the lunar interior. Almost all the previous estimates were based on, 'on-the-spot' measurements from the landing sites. Relative concentration of the isotopes of 40Ar and 36Ar along a meridian by the Chandra's Altitudinal Composition Explorer (CHACE) experiment, on the Moon Impact Probe (MIP) of India's first mission to Moon, has independently yielded clues on the possible spatial heterogeneity in the radiogenic activity of the lunar interior in addition to providing indicative 'antiquity' of the lunar surface along the ground track over the near side of the moon. These results are shown to broadly corroborate the independent topography measurements by the Lunar Laser Ranging Instrument (LLRI) in the main orbiter Chandrayaan-1. The unique combination of these experiments provided high spatial resolution data while indicating the possible close linkages between the lunar interior and the lunar ambience

Optimization of Flexible Flapping-Wing Kinematics in Hover

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140679/1/1.j053083.pd

Electronic Structures of Quantum Dots and the Ultimate Resolution of Integers

The orbital angular momentum L as an integer can be ultimately factorized as a product of prime numbers. We show here a close relation between the resolution of L and the classification of quantum states of an N-electron 2-dimensional system. In this scheme, the states are in essence classified into different types according to the m(k)-accessibility, namely the ability to get access to symmetric geometric configurations. The m(k)-accessibility is an universal concept underlying all kinds of 2-dimensional systems with a center. Numerical calculations have been performed to reveal the electronic structures of the states of the dots with 9 and 19 electrons,respectively. This paper supports the Laughlin wave finction and the composite fermion model from the aspect of symmetry.Comment: Two figure

Approximate aeroelastic modeling of flapping wings: Comparison with CFD and experimental data

Results generated from an aeroelastic model obtained by coupling a nonlinear structural dynamic model based on MARC with an approximate aerodynamic model that incorporates leading edge vortices and a wake model are presented. The aerodynamic model, used in our earlier studies, is extended to forward flight. Results presented describe structural dynamic and aeroelastic studies conducted on isotropic and anisotropic wings in hover. For the cases considered, the approximate model shows reasonable agreement with the CFD based results. Comparisons with experiment indicate that the approximate model captures trends accurately, but under predicts the magnitude of thrust. Preliminary results obtained for a rigid flapping wing in forward flight indicate that, for the cases considered, peak lift generated by the wing increases as forward flight speed increases. Copyright © 2010 by P. Friedmann, A. Gogulapati, E. Kheng, and W. Shyy