Now showing items 1-10 of 168
A note on best approximation and invertibility of operators on uniformly convex Banach spaces
(Hindawi Publishing Corp, 1991-01-01)
It is shown that if X is a uniformly convex Banach space and S a bounded linear operator onX for which ?I-S?=1, then S is invertible if and only if ?I-12S? <1. From this it follows thatif S is invertible on X then either ...
Stability of zircon u-pb systematics in a greenschist-grade mylonite - an example from the rockfish valley fault zone, central Virginia, USA
(University of Chicago Press, 1992-09)
The mid-Paleozoic, greenschist-grade Rockfish Valley Fault Zone (RVFZ) of central Virginia cuts the Grenville-aged Pedlar River Charnockite Suite (PRCS) and contains zircons that underwent brittle failure during ductile ...
Systematic scaling in the low-energy excitations of the t-J model in one and two dimensions
(American Physical Society, 1997-05-01)
We present an exact diagonalization study of the low-energy singlet and triplet states for both the one-dimensional (1D) and 2D t-J models. A scan of the parameter ratio J/t shows that for most low-energy states in both ...
Pole versus Breit-Wigner resonance description of the orbitally excited baryons
(American Physical Society, 1999-06)
We consider the masses used in recent studies involving the nonstrange sector of the l = 1 baryons. The use of T-matrix and K-matrix poles versus the conventional Breit-Wigner masses is discussed within the context of a ...
Location of the southern edge of the Gorda slab and evidence for an adjacent asthenospheric window: Results from seismic profiling and gravity
(American Geophysical Union, 1998-12)
As the Mendocino Triple Junction migrates northward along the California margin it is widely presumed to leave a "slab-free" or "asthenospheric" window in its wake. A 250-km-long south-north seismic refraction-reflection ...
Structure of the subducting Nazca plate beneath Peru
(American Geophysical Union, 1994-05)
Arrival times from intermediate-depth (110-150 km) earthquakes within the region of flat subduction beneath the subandean zone and foreland basins of east-central Peru provide constraints on the geometry and velocity ...
Developing a field of landscape ecotoxicology
(Ecological Society of America, 1996-08)
Since toxicants are spread over ecological landscapes, it seems likely that they have effects at that level of ecological organization. Landscape ecotoxicology examines the effects of toxic chemicals on larger scales than ...
Do similar communities develop in similar sites? A test with zooplankton structure and function
(Ecological Society of America, 1998-08)
McCune and Alien (1985) asked the question "Will similar forests develop on similar sites?" and concluded that dissimilar old-growth forests had developed on similar sites due to historical factors (colonization, disturbance, ...
Biological integrity: a long-neglected aspect of water resource management
(Ecological Society of America, 1991-02)
Water of sufficient quality and quantity is critical to all life. Increasing human population and growth of technology require human society to devote more and more attention to protection of adequate supplies of water. ...
Nonuniversal exponents in interface growth - Newman and Swift reply
(American Physical Society, 1998-12-14)