Erratum: Suppression of localization in kronig-penney models with correlated disorder (Vol. 49, PG 147, 1994)

We consider the electron dynamics and transport properties of one-dimensional continuous models with random, short-range correlated impurities. We develop a generalized Poincare map formalism to cast the Schrodinger equation for any potential into a discrete set of equations, illustrating its application by means of a specific example. We then concentrate on the case of a Kronig-Penney model with dimer impurities. The previous technique allows us to show that this model presents infinitely many resonances (zeroes of the reflection coefficient at a single dimer) that give rise to a band of extended states, in contradiction with the general viewpoint that all one-dimensional models with random potentials support only localized states. We report on exact transfer-matrix numerical calculations of the transmission coefFicient, density of states, and localization length for various strengths of disorder. The most important conclusion so obtained is that this kind of system has a very large number of extended states. Multifractal analysis of very long systems clearly demonstrates the extended character of such states in the thermodynamic limit. In closing, we brieBy discuss the relevance of these results in several physical contexts.

Black maps/vivid waters : beauty and horror in David Maisel's The Lake Project and Terminal Mirage

"This paper examines The Lake Project and Terminal Mirage, the two components of David Maisel’s Black Maps series that concern water. Like the section of the Salt Lake chosen by Robert Smithson for his seminal Spiral Jetty, the alkaline waters Maisel photographs are subject to infestations of bacteria that that give them a visceral hue. Smithson provides a reference for this work; the artists are notable for their shared site, disorienting scale, and attraction to entropy"

The genera of fishes ... : A contribution to the stability of scientific nomenclature / By David Starr Jordan.

pt. 1-2

The Year-book of agriculture, or, The annual of agricultural progress and discovery / [edited] by David A. Wells.

1855-1856

The genera of fishes ... : A contribution to the stability of scientific nomenclature / By David Starr Jordan.

pt. 3-4

Letter from William Croswell to Joseph and David A. Croswell, 1825 July 20

Draft of a letter concerning Continental bills in Croswell's care.

Trachelyichthys exilis, a new species of catfish (Pisces, Auchenipteridae) from Peru / David W. Greenfield and Garrett S. Glodek.

v.72:no.3(1977)

New agnathous fishes from the Pennsylvanian of Illinois / David Bardack -- and Eugene S. Richardson, Jr. --

v.33:no.26(1977)

Morphology and relationships of saurocephalid fishes / [by] David Bardack -- and Gloria Sprinkle --.

v.16:no.12(1969)