• Citations Per Year
Learn More
The authors report a new case of aspergilloma developing in an intra-pulmonary bronchogenic cyst in a girl aged 10 years. A cure was obtained after surgical excision. The possibility of serious complications, such as hemoptysis, abscess formation and spread of the aspergillus, has two consequences; the first is the utility of regular supervision of any(More)
2014 We describe an active damping circuit which uses a 90° phase-shift feedback loop to dampen the ringing of nuclear resonance probes just after the RF excitation. The damping does not operate during the reception of the nuclear signal and there is therefore no loss in efficiency or in sensitivity as would be the case for permanent damping. The use of a(More)
A recently developed cost-effectiveness model for on-line retrieval systems is discussed through use of an example utilizing performance results collected from several independent sources and cost data derived for a recently completed study for the American Psychological Association. One of the primary attributes of the model rests in its great flexibility(More)
  • 1