6,423 research outputs found
Normality of orbit closures in the enhanced nilpotent cone
We continue the study of the closures of -orbits in the enhanced
nilpotent cone V\times\cN begun by the first two authors. We prove that each
closure is an invariant-theoretic quotient of a suitably-defined enhanced
quiver variety. We conjecture, and prove in special cases, that these enhanced
quiver varieties are normal complete intersections, implying that the enhanced
nilpotent orbit closures are also normal.Comment: 30 page
Long-range-corrected hybrids including RPA correlation
We recently demonstrated a connection between the random phase approximation
(RPA) and coupled cluster theory [J. Chem. Phys. 129, 231101 (2008)]. Based on
this result, we here propose and test a simple scheme for introducing
long-range RPA correlation into density functional theory. Our method provides
good thermochemical results and models van derWaals interactions accurately.Comment: Accepted version of the manuscrip
Henderson, Benjamin
Co. C. 1315 Engr. Const. Bn. Camp Sutton, N.C.https://dh.howard.edu/prom_members/1038/thumbnail.jp
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Evacuated Enclosure Mounted Acoustic Actuator and Passive Attenuator
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77190/1/AIAA-2002-1355-680.pd
Fluid structure in the immediate vicinity of an equilibrium three-phase contact line and assessment of disjoining pressure models using density functional theory
We examine the nanoscale behavior of an equilibrium three-phase contact line
in the presence of long-ranged intermolecular forces by employing a statistical
mechanics of fluids approach, namely density functional theory (DFT) together
with fundamental measure theory (FMT). This enables us to evaluate the
predictive quality of effective Hamiltonian models in the vicinity of the
contact line. In particular, we compare the results for mean field effective
Hamiltonians with disjoining pressures defined through (I) the adsorption
isotherm for a planar liquid film, and (II) the normal force balance at the
contact line. We find that the height profile obtained using (I) shows good
agreement with the adsorption film thickness of the DFT-FMT equilibrium density
profile in terms of maximal curvature and the behavior at large film heights.
In contrast, we observe that while the height profile obtained by using (II)
satisfies basic sum rules, it shows little agreement with the adsorption film
thickness of the DFT results. The results are verified for contact angles of
20, 40 and 60 degrees
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