Now showing items 21-30 of 177
Effects of magnification and zooming on depth perception in digital stereomammography: an observer performance study
(IOP Publishing Ltd, 2003-11-21)
We are evaluating the application of stereoscopic imaging to digital mammography. In the current study, we investigated the effects of magnification and zooming on depth perception. A modular phantom was designed which ...
Systematic mask synthesis for surface micromachined microelectromechanical systems
(IOP Publishing Ltd, 2003-11-01)
In the context of designing surface-micromachined microelectromechanical systems (MEMS), there does not appear to be systematic means, with the exception of parametrized layout models, to generate the mask data after the ...
A No‐Depolarization Theorem for Rotator‐Aided Resonance Crossing
(The American Institute of Physics, 2003-05-23)
An rf frequency rotator magnet provides a useful tool for manipulating particle spins in any accelerator or storage ring with polarized beams. This note briefly demonstrates the general idea of the rotator‐aided crossing ...
Parallel, Adaptive‐Mesh‐Refinement MHD for Global Space‐Weather Simulations
(The American Institute of Physics, 2003-09-02)
The first part of this paper reviews some issues representing major computational challenges for global MHD models of the space environment. These issues include mathematical formulation and discretization of the governing ...
Recent Developments in Mixed Ionic and Electronic Conducting Electrodes for the Alkali Metal Thermal Electric Converter (AMTEC)
(The American Institute of Physics, 2003-01-28)
Mixed ionic and electronic conducting electrodes (MIECEs) have recently gained more attention in the development of the Alkali Metal Thermal Electric Converter (AMTEC). The advantage of MIECEs, as their name implies, is ...
Open Wilson lines and group theory of noncommutative Yang-Mills theory in two dimensions
(IOP Publishing Ltd, 2003-05-01)
The correlation functions of open Wilson line operators in two-dimensional Yang-Mills theory on the noncommutative torus are computed exactly. The correlators are expressed in two equivalent forms. An instanton expansion ...
LETTER TO THE EDITOR: Sharp variations in the temperature dependence of optical reflectivity from AlN/GaN heterostructures
(IOP Publishing Ltd, 2003-02-01)
Sharp variations in optical reflectivity were observed when cooling and heating AlN/GaN heterostructures on sapphire substrates between room temperature and 10 K. The reflectivity was found to decrease at a definite ...
Bounds on dissipation in magnetohydrodynamic Couette and Hartmann shear flows
(The American Institute of Physics, 2003-11)
Shear flow with an applied cross-stream magnetic field is studied using dissipative incompressible magnetohydrodynamics. The study incorporates exact solutions, the energy stability method, and exact bounds on the total ...
Plasma coating of carbon nanofibers for enhanced dispersion and interfacial bonding in polymer composites
(The American Institute of Physics, 2003-12-22)
Ultrathin films of polystyrene were deposited on the surfaces of carbon nanofibers using a plasma polymerization treatment. A small percent by weight of these surface-coated nanofibers were incorporated into polystyrene ...
Braneworlds and Large Extra Dimensions
(The American Institute of Physics, 2003-02-11)
The idea of extra dimensions has always played an important rôle in string theory. However, until recently, most of the interest has been on small extra dimensions. With the introduction of braneworlds, this view has been ...