70,011 research outputs found
Scalar Casimir Energies for Separable Coordinate Systems: Application to Semi-transparent Planes in an Annulus
We derive a simplified general expression for the two-body scalar Casimir
energy in generalized separable coordinate systems. We apply this technique to
the case of radial semi-transparent planes in the annular region between two
concentric Dirichlet cylinders. This situation is explored both analytically
and numerically.Comment: 8 pages, 5 figures. Contribution to Proceedings of 9th Conference on
Quantum Field Theory Under the Influence of External Conditions, QFEXT0
Energetics and Dipole Moment of Transition Metal Monoxides by Quantum Monte Carlo
The transition metal-oxygen bond appears very prominently throughout
chemistry and solid-state physics. Many materials, from biomolecules to
ferroelectrics to the components of supernova remnants contain this bond in
some form. Many of these materials' properties depend strongly on fine details
of the TM-O bond, which makes accurate calculations of their properties very
challenging. Here we report on highly accurate first principles calculations of
the properties of TM monoxide molecules within fixed-node Diffusion Monte Carlo
and Reptation Monte Carlo.Comment: 6 pages, 2 figures, submitted to Journal of Chemical Physic
Time and space integrating acousto-optic folded spectrum processing for SETI
Time and space integrating folded spectrum techniques utilizing acousto-optic devices (AOD) as 1-D input transducers are investigated for a potential application as wideband, high resolution, large processing gain spectrum analyzers in the search for extra-terrestrial intelligence (SETI) program. The space integrating Fourier transform performed by a lens channels the coarse spectral components diffracted from an AOD onto an array of time integrating narrowband fine resolution spectrum analyzers. The pulsing action of a laser diode samples the interferometrically detected output, aliasing the fine resolution components to baseband, as required for the subsequent charge coupled devices (CCD) processing. The raster scan mechanism incorporated into the readout of the CCD detector array is used to unfold the 2-D transform, reproducing the desired high resolution Fourier transform of the input signal
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