312,579 research outputs found
Intelligent manipulation technique for multi-branch robotic systems
New analytical development in kinematics planning is reported. The INtelligent KInematics Planner (INKIP) consists of the kinematics spline theory and the adaptive logic annealing process. Also, a novel framework of robot learning mechanism is introduced. The FUzzy LOgic Self Organized Neural Networks (FULOSONN) integrates fuzzy logic in commands, control, searching, and reasoning, the embedded expert system for nominal robotics knowledge implementation, and the self organized neural networks for the dynamic knowledge evolutionary process. Progress on the mechanical construction of SRA Advanced Robotic System (SRAARS) and the real time robot vision system is also reported. A decision was made to incorporate the Local Area Network (LAN) technology in the overall communication system
A root-mean-square pressure fluctuations model for internal flow applications
A transport equation for the root-mean-square pressure fluctuations of turbulent flow is derived from the time-dependent momentum equation for incompressible flow. Approximate modeling of this transport equation is included to relate terms with higher order correlations to the mean quantities of turbulent flow. Three empirical constants are introduced in the model. Two of the empirical constants are estimated from homogeneous turbulence data and wall pressure fluctuations measurements. The third constant is determined by comparing the results of large eddy simulations for a plane channel flow and an annulus flow
Pair Correlation Function of Wilson Loops
We give a path integral prescription for the pair correlation function of
Wilson loops lying in the worldvolume of Dbranes in the bosonic open and closed
string theory. The results can be applied both in ordinary flat spacetime in
the critical dimension d or in the presence of a generic background for the
Liouville field. We compute the potential between heavy nonrelativistic sources
in an abelian gauge theory in relative collinear motion with velocity v =
tanh(u), probing length scales down to r_min^2 = 2 \pi \alpha' u. We predict a
universal -(d-2)/r static interaction at short distances. We show that the
velocity dependent corrections to the short distance potential in the bosonic
string take the form of an infinite power series in the dimensionless variables
z = r_min^2/r^2, uz/\pi, and u^2.Comment: 16 pages, 1 figure, Revtex. Corrected factor of two in potential.
Some changes in discussio
Estimation of gravitational acceleration with quantum optical interferometers
The precise estimation of the gravitational acceleration is important for
various disciplines. We consider making such an estimation using quantum
optics. A Mach-Zehnder interferometer in an "optical fountain" type arrangement
is considered and used to define a standard quantum limit for estimating the
gravitational acceleration. We use an approach based on quantum field theory on
a curved, Schwarzschild metric background to calculate the coupling between the
gravitational field and the optical signal. The analysis is extended to include
the injection of a squeezed vacuum to the Mach-Zehnder arrangement and also to
consider an active, two-mode SU(1,1) interferometer in a similar arrangement.
When detection loss is larger than , the SU(1,1) interferometer shows an
advantage over the MZ interferometer with single-mode squeezing input. The
proposed system is based on current technology and could be used to examine the
intersection of quantum theory and general relativity as well as for possible
applications.Comment: 9 pages, 5 figure
Decay rate of a Wannier exciton in low dimensional systems
The superradiant decay rate of Wannier exciton in one dimensional system is
studied. The crossover behavior from 1D chain to 2D film is also examined. It
is found that the decay rate shows oscillatory dependence on channel width L.
When the quasi 1-D channel is embeded with planar microcavities, it is shown
that the dark mode exciton can be examined experimentally.Comment: 12 pages, 1 figur
The Cauchy Operator for Basic Hypergeometric Series
We introduce the Cauchy augmentation operator for basic hypergeometric
series. Heine's transformation formula and Sears'
transformation formula can be easily obtained by the symmetric property of some
parameters in operator identities. The Cauchy operator involves two parameters,
and it can be considered as a generalization of the operator . Using
this operator, we obtain extensions of the Askey-Wilson integral, the Askey-Roy
integral, Sears' two-term summation formula, as well as the -analogues of
Barnes' lemmas. Finally, we find that the Cauchy operator is also suitable for
the study of the bivariate Rogers-Szeg\"o polynomials, or the continuous big
-Hermite polynomials.Comment: 21 pages, to appear in Advances in Applied Mathematic
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