The delayed choice experiments of the type introduced by Wheeler and extended by Englert, Scully, Süssmann and Walther [ESSW], and others, have formed a rich area for investigating the puzzling behaviour of particles undergoing quantum interference. The surprise provided by the original delayed choice experiment, led Wheeler to the conclusion that “no phenomenon is a phenomenon until it is an o...

As Henri PoincarC once remarked, “solution of a mathematical problem” is a phrase of indefinite meaning. Pure mathematicians sometimes are satisfied with showing that the non-existence of a solution implies a logical contradiction, while engineers might consider a numerical result as thc only reasonable goal. Such one sided views seem to reflect human limitations rather than objective values. I...

The ganglion impar is an unpaired sympathetic structure located at the level of the sacrococcygeal joint. Blockade of this structure has been utilised to treat chronic perineal pain. Methods to achieve this block often involve the use of fluoroscopy which is associated with radiation exposure of staff involved in providing these procedures. We rep...

We consider the detection of multivariate spatial clusters in the Bernoulli model with N locations, where the design distribution has weakly dependent marginals. The locations are scanned with a rectangular window with sides parallel to the axes and with varying sizes and aspect ratios. Multivariate scan statistics pose a statistical problem due to the multiple testing over many scan windows, a...

C omputer-mediated communication (CMC) systems, in a variety of forms, have become integral to the initiation, development , and maintenance of interpersonal relationships. They are involved in the subtle shaping of communication in almost every relational context. We may observe or participate in the conversations of huge numbers of social actors, from the Twitter messages of experts we have n...

Operationalizing mediated presence: Initial steps toward a measure of the construct This paper reports on an exploratory project to investigate mediated presence, a construct defined as the extent to which participants in a virtual environment perceive other participants in that environment as real, immediate or salient. Development and initial testing of a prompt designed to consistently diffe...