The weakly coupled vacuum of E8⊗E8 heterotic string theory remains an attractive scenario for particle physics. The particle spectrum and the issue of dilaton stabilization are reviewed. A specific model for hidden sector condensation and supersymmetry breaking, that respects known constraints from string theory, is described, and its phenomenological and cosmological implications are discussed...

This paper discusses the difficulties of describing an appropriate notion of the security attributes caller and target in object-oriented middleware systems such as CORBA. Our analysis points out that, whilst there is no information available on the ORB layer to describe the caller and target, it is possible in practice to use descriptors from other layers. In CORBA security, the mechanism-spec...