This paper presents a methodology for performing complex wavenumber ray tracing in which both wave trajectory and amplitude are calculated. This ray-tracing framework is first derived using a scaling in which the imaginary wavenumber component is assumed to be much smaller than the real wavenumber component. The approach, based on...
In order to resolve a long-standing discrepancy of some 30 standard deviations between the two most precise previously reported values of the γ-ray energies in the ³⁸Cl decays, we have undertaken a new precision measurement of the decay energies using a variety of different sources for energy calibration. The deduced...
Siletzia is a basaltic Paleocene and Eocene large igneous province in coastal Oregon, Washington, and southern Vancouver Island that was accreted to North America in the early Eocene. New U-Pb magmatic, detrital zircon, and ⁴⁰Ar/³⁹Ar ages constrained by detailed field mapping, global nannoplankton zones, and magnetic polarities allow correlation of...
Easier access to X-ray microtomography (lCT) facilities has provided much new insight from high-resolution imaging for various problems in porous media research. Pore space analysis with respect to functional properties usually requires segmentation of the intensity data into different classes. Image segmentation
is a nontrivial problem that may have a...
One of the most important unresolved issues in gamma-ray burst (GRB) physics is the origin of the prompt gamma-ray spectrum. Its general non-thermal character and the softness in the X-ray band remain unexplained. We tackle these issues by performing Monte Carlo simulations of radiation-matter interactions in a scattering dominated photon-lepton...
The most damaging foliar disease of pyrethrum in Australia is ray
blight caused by Stagonosporopsis tanaceti. The probability of growers
incurring economic losses caused by this disease has been substantially
reduced by the implementation of a prophylactically applied spring
fungicide program. This has been traditionally initiated when 50% of
the...
The Franciscan Complex accretionary prism was assembled during an similar to 165-m.y.-long period of subduction of Pacific Ocean plates beneath the western margin of the North American plate. In such fossil subduction complexes, it is generally difficult to reconstruct details of the accretion of continent-derived sediments and to evaluate the...
Physical mapping and genome sequencing are underway for the ≈17 Gb wheat genome. Physical mapping methods independent of meiotic recombination, such as radiation hybrid (RH) mapping, will aid precise anchoring of BAC contigs in the large regions of suppressed recombination in Triticeae genomes. Reports of endosperm development following pollination with...
The oceanic tidal angular momentum (OTAM) has
Been demonstrated to be the primary cause for the diurnal and
semidiurnal variations in the Earth's rotational rate, or ∆UT1.
Three ocean tide models derived from the Topex/Poseidon
altimetry mission are employed to yield predictions of ∆UT1 for
eight major diurnal/semidiurnal tides. The...