Now showing items 21-30 of 177
Unidirectional compression of electrorheological fluids in electric fields
(The American Institute of Physics, 2005-10-01)
A series of unidirectional compression tests on electrorheological fluids has been carried out with different plate sizes, initial plate separations, and applied voltages. Experimental results of compression pressure were ...
Random walks, diffusion limited aggregation in a wedge, and average conformal maps
(The American Institute of Physics, 2005-06)
We investigate diffusion-limited aggregation (DLA) in a wedge geometry. Arneodo and collaborators have suggested that the ensemble average of DLA cluster density should be close to the noise-free selected Saffman-Taylor ...
Nanoporous Structure in Low-Dielectric Films with Positronium Annihilation Lifetime Spectroscopy
(IOP Publishing Ltd, 2005-06-01)
We investigate nano-porous structures in thin low-dielectric films, i.e. the pore sizes, distributions, and interconnectivity, by using depth profiled positronium annihilation lifetime spectroscopy (PALS). It is found ...
Heterotic strings in two dimensions and new stringy phase transitions
(IOP Publishing Ltd, 2005-08-01)
We discuss heterotic string theories in two dimensions with gauge groups Spin(24) and Spin(8) × E8. After compactification the theories exhibit a rich spectrum of states with both winding and momentum. At special ...
A CMOS-compatible high aspect ratio silicon-on-glass in-plane micro-accelerometer
(IOP Publishing Ltd, 2005-02-01)
This paper presents a post-CMOS-compatible micro-machined silicon-on-glass (SOG) in-plane capacitive accelerometer. The accelerometer is a high aspect ratio structure with a 120 µm thick single-crystal silicon proof-mass ...
Control of finite-dimensional quantum systems: Application to a spin-½12 particle coupled with a finite quantum harmonic oscillator
(The American Institute of Physics, 2005-03)
In this paper, we consider the problem of the controllability of a finite-dimensional quantum system in both the Schrödinger and interaction pictures. Introducing a Quantum Transfer Graph, we elucidate the role of Lie ...
Quantum dot formation on a strain-patterned epitaxial thin film
(The American Institute of Physics, 2005-09-26)
We model the effect of substrate strain patterning on the self-assembly of quantum dots (QDs). When the surface energy is isotropic, we demonstrate that strain patterning via embedded substrate inclusions may result in ...
Boundary counterterms and the thermodynamics of 2-D black holes
(IOP Publishing Ltd, 2005-09-01)
We utilize a novel method to study the thermodynamics of two dimensional type 0A black holes with constant RR flux. Our approach is based on the Hamilton-Jacobi method of deriving boundary counterterms. We demonstrate this ...
Modal response and frequency shift of the cantilever in a noncontact atomic force microscope
(The American Institute of Physics, 2005-10-31)
The force-sensing cantilever in a noncontact atomic force microscope is a continuous system with infinite number of eigenmodes. Although the frequently used point mass model was found sufficient in many cases, its conditions ...
High Reynolds number experimentation in the US Navy's William B Morgan Large Cavitation Channel
(IOP Publishing Ltd, 2005-09-01)
The William B Morgan Large Cavitation Channel (LCC) is a large variable-pressure closed-loop water tunnel that has been operated by the US Navy in Memphis, TN, USA, since 1991. This facility is well designed for a wide ...