One-dimensional analysis is presented of solitary positive potential plasma structures whose velocity lies within the range ion distribution velocities that are strongly populated: ``slow'' electron holes. It shown to avoid self-acceleration hole away from it must lie a local minimum in distribution. Quantitative criteria for existence stable equilibria obtained. The background distributions re...

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Effort-biased technological change and other explanations for work intensification are investigated. It is hypothesised that technological and organizational changes are one important source of work intensification and supportive evidence is found using establishment data for Britain in the 1990s. Work intensification has also been stimulated by the use of highcommitment human resource policies...

osteochondromatosis of the hip is a rare disease inwhich segments of synovial membrane become cartilaginous. these may calcify or ossify formin- g osteocartilag-inous masses as loose bodies. it occurs most often in young or middle-aged adults and the etiology or the condition is unknown. the diagnosis can be apparent with due consideration on clinical history and proper x-ray examination or the...