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We consider wave propagation and scattering governed by one dimensional Schrödinger operators with truncated periodic potentials. The propagation of wave packets with narrow frequency supports is studied. The goal is to describe potentials for which the group velocity (for periodic problem) is small and the transmission coefficient for the truncated potential is not too small, i.e. to find medi...
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Teenaged girls constitute the fastest growing segment of children and adolescents participating in organized athletics. Adolescent girls appear to have similar injury rates as boys in comparable activities but different injury patterns. To properly diagnose and manage athletic injuries in adolescent girls, pediatric health care providers must be aware of these differences, especially as the lit...
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Over the past four decades, there has been increasing interest in the effects of music listening on hearing. The purpose of this paper is to review published studies that detail the noise levels, the potential effects (e.g. noise-induced hearing loss), and the perceptions of those affected by music exposure in occupational and non-occupational settings. The review employed Medline, PubMed, Psyc...
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Laughter is an important social signal which may have various communicative functions (Chapman 1983). Humans laugh at humorous stimuli or to mark their pleasure when receiving praised statements (Provine 2001); they also laugh to mask embarrassment (Huber and Ruch 2007) or to be cynical. Laughter can also act as social indicator of in-group belonging (Adelswärd 1989); it can work as speech regu...
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ژورنال
عنوان ژورنال: BMJ
سال: 1999
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.318.7184.678