منابع مشابه
Learning curve for sonographic examination of the fetal nasal bone at 11-14 weeks.
OBJECTIVE To determine the number of ultrasound examinations necessary for training sonographers to examine accurately the fetal nasal bone at 11-14 weeks' gestation. METHODS Fifteen sonographers with experience in measuring nuchal translucency were asked to examine the nasal bone during the routine 11-14-week scan. The supervising doctor recorded if the sonographer succeeded in obtaining the...
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OBJECTIVE Although accuracy for focused assessment with sonography for trauma (FAST) examination interpretation has been widely reported, the learning curve for FAST interpretation by emergency medicine (EM) residents who are novice to ultrasound has not been well described. The present study's objective was to analyse EM resident FAST interpretation accuracy over 18 months. METHODS Prospecti...
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Blanchflower and Oswald (1994) have argued that, in regional data, the level of unemployment is related to the fevel of wages. This result is at variance with an application of the original Phillips curve to regional data, which would predict that the change in wages ought to be related to the unemployment rate. On the other hand, there is considerable empirical support for the expectations-aug...
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This study uses the National Educational Longitudinal Survey of 1988 (NELS) to replicate both the analysis in The Bell Curve and that of several of its previous replications. We examine the relative importance of test scores and family background in predicting dropping out of high school, starting college, arrests, and out-of-wedlock fertility. Our results relax several arbitrary assumptions ma...
متن کاملExamination of stimulation mechanism and strength-interval curve in cardiac tissue.
Understanding the basic mechanisms of excitability through the cardiac cycle is critical to both the development of new implantable cardiac stimulators and improvement of the pacing protocol. Although numerous works have examined excitability in different phases of the cardiac cycle, no systematic experimental research has been conducted to elucidate the correlation among the virtual electrode ...
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ژورنال
عنوان ژورنال: Nature
سال: 1895
ISSN: 0028-0836,1476-4687
DOI: 10.1038/051617c0