A Bering Sea Forecast from Oceanographic Monthly Summary (OMS) Data

On June 6, 1984, The Environmental Acoustic Research Group was asked if the SST in the Bering Sea for the remainder of June-July would be anomalous. An answer was desired within a few hours. No recent observations were available. However, a newly published article by Niebauer (1984) had established a 25%- 30% probability that surface air temperature in the Pribiloff Island area would be higher some 12 months after an ENSO event (ENSO is an El Nino index). Considering this probability and that there was an ENSO event in 1982-83, an anomalously warm 1984 summer was indicated

Motional narrowing effect in certain random binary lattices

We present a model for a class of random binary lattices by introducing a one-dimensional system where impurities are placed in one sublattice while host atoms lie on the other sublattice. The source of disorder is the stochastic fluctuation of the impurity energy from site to site. We study the optical absorption spectra and the peculiarities of the motional narrowing effect at the band edges for perturbative and nonperturbative degrees of disorder. Analytical results agree well with numerical simulations.Comment: 4 pages, REVTeX, 2 Postscript figures included. To appear in Physics Letters

Direct Minimization Generating Electronic States with Proper Occupation Numbers

We carry out the direct minimization of the energy functional proposed by Mauri, Galli and Car to derive the correct self-consistent ground state with fractional occupation numbers for a system degenerating at the Fermi level. As a consequence, this approach enables us to determine the electronic structure of metallic systems to a high degree of accuracy without the aid of level broadening of the Fermi-distribution function. The efficiency of the method is illustrated by calculating the ground-state energy of C$_2$ and Si$_2$ molecules and the W(110) surface to which a tungsten adatom is adsorbed.Comment: 4 pages, 4 figure

Consolidated Research Program United States Gulf Coast Geopressured-Geothermal Program

The logging research program in the DOE Geopressured-Geothermal Energy Project was set up to (a) carry out research on logging problems important to the DOE program; (b) provide advice on logging programs in DOE wells; (c) monitor log quality during data acquisition; (d) provide log analyses as requested by DOE and (e) provide other services as skills and time permit. Funding for the project amounted to about $50,000/year from 1979 to 1985 (direct cost plus overhead). In 1986 DOE funding began to increase and was about$100,000 per year for the last three years of the project (1988-91). In addition to DOE funding, the Gas Research Institute Tight Gas Sands Project contributed to our boron research by about $7,000 per year during 1989-91, plus about$100,000 worth of core and log data from five tight gas sand wells in East and West Texas and in Wyoming

Frenkel Excitons in Random Systems With Correlated Gaussian Disorder

Optical absorption spectra of Frenkel excitons in random one-dimensional systems are presented. Two models of inhomogeneous broadening, arising from a Gaussian distribution of on-site energies, are considered. In one case the on-site energies are uncorrelated variables whereas in the second model the on-site energies are pairwise correlated (dimers). We observe a red shift and a broadening of the absorption line on increasing the width of the Gaussian distribution. In the two cases we find that the shift is the same, within our numerical accuracy, whereas the broadening is larger when dimers are introduced. The increase of the width of the Gaussian distribution leads to larger differences between uncorrelated and correlated disordered models. We suggest that this higher broadening is due to stronger scattering effects from dimers.Comment: 9 pages, REVTeX 3.0, 3 ps figures. To appear in Physical Review

Anderson localization as a parametric instability of the linear kicked oscillator

We rigorously analyse the correspondence between the one-dimensional standard Anderson model and a related classical system, the `kicked oscillator' with noisy frequency. We show that the Anderson localization corresponds to a parametric instability of the oscillator, with the localization length determined by an increment of the exponential growth of the energy. Analytical expression for a weak disorder is obtained, which is valid both inside the energy band and at the band edge.Comment: 7 pages, Revtex, no figures, submitted to Phys. Rev.

Localization Properties of Electronic States in Polaron Model of poly(dG)-poly(dC) and poly(dA)-poly(dT) DNA polymers

We numerically investigate localization properties of electronic states in a static model of poly(dG)-poly(dC) and poly(dA)-poly(dT) DNA polymers with realistic parameters obtained by quantum-chemical calculation. The randomness in the on-site energies caused by the electron-phonon coupling are completely correlated to the off-diagonal parts. In the single electron model, the effect of the hydrogen-bond stretchings, the twist angles between the base pairs and the finite system size effects on the energy dependence of the localization length and on the Lyapunov exponent are given. The localization length is reduced by the influence of the fluctuations in the hydrogen bond stretchings. It is also shown that the helical twist angle affects the localization length in the poly(dG)-poly(dC) DNA polymer more strongly than in the poly(dA)-poly(dT) one. Furthermore, we show resonance structures in the energy dependence of the localization length when the system size is relatively small.Comment: 6 pages, 6 figure