Eric van Douwen [5] produced a maximal crowded extremally disconnected regular space and showed that its Čech–Stone compactification is an at most two-to-one image of βN. We construct for any n = 3 an example of a compact crowded space Xn that is an image of βN under a map all of whose fibers have either size n or n− 1. We also show that under CH this is best possible.

This study presents acoustic and electromagnetic articulometry (EMA) data for the vowel /i/ in pre-boundary position in French. The boundaries examined are the Utterance, the Intonational phrase, the Accentual phrase, the Word and the Syllable. Our results show that although durational effects of prosodic boundary are still very strong, the effects on supralaryngeal articulation and on spectral...

Space debris monitoring is nowadays a priority for worldwide space agencies, due to the serious threat that these objects present. More and more efforts have been made extend network of available radar systems devoted control space. A meticulous review has done in this paper, order find classify considerable amounts data provided by scientific community deal with RADAR measurement tracking. The...

This article addresses the way in which we can generate an "acoustically bright zone" in a space. The bright zone is defined as the volume where we can have higher acoustic energy than in other space. A method is proposed to generate the bright zone by controlling multiple monopole sources. Two kinds of cost functions involved with acoustic brightness are defined. One is the ratio of the bright...

A long-standing question in speech perception research is how do listeners extract linguistic content from a highly variable acoustic input. In the domain of vowel perception, formant ratios, or the calculation of relative bark differences between vowel formants, have been a sporadically proposed solution. We propose a novel formant ratio algorithm in which the first (F1) and second (F2) forman...