This paper investigates interaction of users with multiple agents in the context of web-based implicit communities of learners. In particular a user-centred quality-of-content control mechanism is presented, inspired by social protocols of interaction, which is used for building and maintaining cohesion of such communities. This takes the form of an innovative algorithm for ranking offers of ed...

Studies of human spatial behavior and life spaces are useful because they allow a better understanding of the relationship between people and environment. In an era when there is growing public pressure to understand this relationship, studies of life spaces may provide insight into the environmental sensitivity of different groups of people. In this article, we propose a method for characteriz...

This paper is the sequel of the paper [4], in which we established the arithmetic volume function of C-hermitian Q-invertible sheaves and proved its continuity. The continuity of the volume function has a lot of applications as treated in [4]. In this paper, we would like to consider its continuous extension over R. CONTENTS Introduction 1 1. A multi-indexed version of the fundamental estimatio...

An extension of Wetzel* s theory is proposed to explain electron precursor phenomena in pressure driven shock tubes. The theory is based on the assumption, which hae been experimentally verified, that radiation from the hot gas behind the shock front is responsible for the precursor effect. A point radiator, located at the shock front and moving with the shock velocity, is assumed. It is shown ...