Supersymmetric Unification

The measured value of the weak mixing angle is, at present, the only precise experimental indication for physics beyond the Standard Model. It points in the direction of Unified Theories with Supersymmetric particles at accessible energies. We recall the ideas that led to the construction of these theories in 1981.Comment: 21 pages, latex, two figures available by snail-mail upon e-mail request; Talk presented at the International Conference on the History of Original Ideas and Basic Discoveries in Particle Physics held at Ettore Majorana Centre for Scientific Culture, Erice, Sicily, July 29-Aug.4, 199

Density-Functional Theory (DFT) Computations on Organic Semiconductors

Undergraduate Basi

Real-time and Probabilistic Temporal Logics: An Overview

Over the last two decades, there has been an extensive study on logical formalisms for specifying and verifying real-time systems. Temporal logics have been an important research subject within this direction. Although numerous logics have been introduced for the formal specification of real-time and complex systems, an up to date comprehensive analysis of these logics does not exist in the literature. In this paper we analyse real-time and probabilistic temporal logics which have been widely used in this field. We extrapolate the notions of decidability, axiomatizability, expressiveness, model checking, etc. for each logic analysed. We also provide a comparison of features of the temporal logics discussed