Now showing items 21-30 of 110
Energy levels and transition probabilities in doubly-ionized erbium (Er III)
(IOP Publishing Ltd, 1997-11-01)
The spectrum of Er III reported by Becher (1966) was reanalysed with the support of new predictions of energies and transition probabilities. The number of energy levels was increased from 45 to 115, including two levels ...
The design of a cathode to operate in an oxygen-rich environment
(The American Institute of Physics, 1997-01-10)
The primary problem with Hall plasma accelerator operation on oxygen is poor cathode performance and short lifetime. The primary problem with micro Hall thrusters is the absence of a stable low power cathode. Cathodes ...
Extended ensemble molecular dynamics method for constant strain rate uniaxial deformation of polymer systems
(The American Institute of Physics, 1997-09-15)
We describe a novel molecular dynamics (MD) method to simulate the uniaxial deformation of an amorphous polymer. This method is based on a rigorously defined statistical mechanics ensemble appropriate for describing an ...
Double Bracket Equations and Geodesic Flows on Symmetric Spaces
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1997-08)
In this paper we consider the geometry of Hamiltonian flows on the cotangent bundle of coadjoint orbits of compact Lie groups and on symmetric spaces. A key idea here is the use of the normal metric to define the kinetic ...
“Fracture” phenomena in shearing flow of viscous liquids
(Steinkopff-Verlag; Springer Science+Business Media, 1997-09)
In start-up of steady shearing flow of two viscous unentangled liquids, namely low-molecular-weight polystyrene and α-D-glucose, the shear stress catastrophically collapses if the shear rate is raised above a value ...
An X-ray size-temperature relation for galaxy clusters: Observation and simulation
(Univ Chicago Press, 1997-12-10)
We show that galaxy clusters conform to a tight relation between X-ray isophotal size R-I and emission-weighted intracluster medium (ICM) temperature [T-X]. The best-fit relation for 41 members of an X-ray flux-limited ...
Star formation history of elliptical galaxies from low-redshift evidence
(The American Institute of Physics, 1997-02-10)
Star formation in elliptical galaxies (Es) was and is mostly dominated by mergers and accretions with many suggestive examples seen among local galaxies. Present day star formation in Es is easily measurable in 2/32/3 of ...
Preliminary assessment of fluorine-18 fluorodeoxyglucose positron mission tomography in patients with bladder cancer
(Springer-Verlag, 1997-06)
The purpose of this study was to assess the feasibility of imaging of bladder cancer with fluorine-18 fluorodeoxyglucose positron emission tomography (FDG-PET) scanning. We studied 12 patients with histologically proven ...
Taub numbers at future null infinity: III. The Bondi mass
(IOP Publishing Ltd, 1997-07-01)
This work extends the ideas developed in two previous papers by the authors. First- and second-order perturbation solutions of Einstein's equations (in Newman - Penrose form) for the Bondi - Sachs metric are found on a ...
Inverse scattering for time-varying one-dimensional layered media: algorithms and applications
(IOP Publishing Ltd, 1997-06-01)
We formulate and present algorithms and applications for the inverse scattering problem for a one-dimensional layered medium whose reflection coefficients vary with time. We show that given the reflection responses to ...