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We present a multichannel coincidence-counting module for use in quantum optics experiments. The circuit takes up to four transistor-transistor logic pulse inputs and counts either twofold, threefold, or fourfold coincidences, within a user-selected coincidence-time window as short as 12 ns. The module can accurately count eight sets of multichannel(More)
An early evaluation of the Chiari pelvic osteotomy done on 19 hips in 16 patients is presented. Indications were: (1) congenital hip dysplasia, where conservative or other surgical treatment had failed or where the patient's age contraindicted conservative treatment, and (2) hypoplastic hip joints associated with neuromuscular disorders. Results were(More)
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