Effects of scale in predicting global structural response

Analytical techniques for scale-up effects were reviewed. The advantages and limitations of applying the principles of similitude to composite structures is summarized and illustrated by simple examples. An analytical procedure was formulated to design scale models of an axially compressed composite cylinder. A building-block approach was outlined where each structural detail is analyzed independently and the probable failure sequence of a selected component is predicted, taking into account load redistribution subsequent to first element failure. Details of this building-block approach are under development

Kondo Effect in Fermi Systems with a Gap: A Renormalization Group Study

We present the results of a Wilson Renormalization Group study of the single-impurity Kondo and Anderson models in a system with a gap in the conduction electron spectrum. The behavior of the impurity susceptibility and the zero-frequency response function, $T>$ are discussed in the cases with and without particle-hole symmetry. In addition, for the asymmetric Anderson model the correlation functions, $<\vec S \cdot\vec \sigma (0)>$,$$, and$$ are computed.Comment: 10 pages, 10 figure

A relation between the characteristic generators of a linear code and its dual

© 2005 IEEE.It was conjectured by Koetter and Vardy that if the k characteristic generators of a linear code C are linearly independent, then the corresponding n-k characteristic generators of the dual code C/sup /spl perp// are also linearly independent. In this correspondence, we prove that the conjecture is true for self-dual codes and cyclic codes.Haibin Kan and Hong She

Lower bounds on the minimal delay of complex orthogonal designs with maximal rates

Copyright © 2006 IEEEThe maximal rates and the minimal delays are basic problems of space-time block codes from complex orthogonal designs. Liang systematically solved the problem on the maximal rates of complex orthogonal designs, and posed an open problem on the minimal delays. Recently, the authors gave the negative answer for the open problem. In this letter, we give lower bounds on the minimal delays.Haibin Kan and Hong She

Design and implementation of an editor and simulators for constraint automata in the context of Reo

The coordination language Reo offers a flexible framework for compositionally constructing software systems out of components through connectors. These connectors not only connect components with each other, but also exogenously coordinate the interactions between them. The connectors themselves are compositionally built out of simpler connectors, where the simplest connectors are a set of user-defined channels with well-defined behavior. Formal semantics can be given to Reo using constraint automata and timed data streams. Constraint automata can be seen as an extension of the finite automata, where the language accepted by an automaton is specified by using timed data streams. In this thesis we describe the design and implementation of a tool for constraint automata consisting of an editor and three simulators. The constraint automata editor allows users to visually construct and modify constraint automata. The first simulator for constraint automata acts as a language acceptor of timed data streams. The second one simulates a constraint automaton as a Reo connector where the input is defined as timed data streams. The third simulator simulates a constraint automaton as a Reo connector where components are attached to. These components deliver the input at real-time instead of using predefined timed data stream