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.

Organizational maintenance repair parts and special tools list : pneumatic tires, electric motor, AC, 10 HP, 416V, 3 phase, 60 cycle, 50 ft long, conveyor, belt, 300 tons per hr., wheel mounted 24 in. wide belt, NSN 3910-00-790-2175, Barber-Greene model PG 70.

Includes index.

Direct support and general support maintenance repair parts and special tools lists : pneumatic tires, electric motor, AC, 10 HP, 416V 3 phase, 60 cycle, 50 ft long, conveyor, belt, 300 tons per hr, wheel mounted, 24 in. wide belt, NSN 3910-00-790-2175, Barber-Green model PG 70.

Includes index.

Unit, direct support, and general support maintenance repair parts and special tools lists : conveyor, belt, EMD, 50 ft long, 300 TPH, pneumatic tires (NSN 3910-00-790-2175), Barber-Greene model PG 70.

"June 1992."

On the spectrum of non-Denniston maximal arcs in PG(2,2h)

In 1969, Denniston gave a construction of maximal arcs of degree n in Desarguesian projective planes of even order q, for all n dividing q. Recently, Mathon gave a construction method that generalized that of Denniston. In this paper we use that method to give maximal arcs that are not of Dermiston type for all n dividing q, 4 < n < q/2, q even. It is then shown that there are a large number of isomorphism classes of such maximal arcs when n is approximately rootq. (C) 2003 Elsevier Ltd. All rights reserved.