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Karen Wynn is known for her pioneering work on infants' and children's early numerical cognition.The first of her many influential research studies on this topic, published in the scientific journal Nature in 1992, reported that five-month-old human infants are able to compute the outcomes of simple addition and subtraction operations on small sets of physical objects.
A cycloconverter (CCV) or a cycloinverter converts a constant amplitude, constant frequency AC waveform to another AC waveform of a lower frequency by synthesizing the output waveform from segments of the AC supply without an intermediate DC link (Dorf 1993, pp. 2241–2243 and Lander 1993, p. 181). There are two main types of CCVs, circulating ...
A cycloconverter is also a type of frequency changer. Unlike a VFD, which is an indirect frequency changer since it uses an AC-DC stage and then a DC-AC stage, a cycloconverter is a direct frequency changer because it uses no intermediate stages. Another application is in the aerospace and airline industries. Often airplanes use 400 Hz power so ...
The tap converter is a variation on the cycloconverter, invented in 1981 by New York City electrical engineer Melvin Sandler and significantly functionally enhanced in 1982 through 1984 by graduate students Mariusz Wrzesniewski, Bruce David Wilner, and Eddie Fung.
Fig 2: Topology of (regenerative) voltage-source inverter AC/DC-AC converter [3] Fig 3: Topology of current-source inverter AC/DC-AC converter [4] [5] There are two types of converters with DC link: Voltage-source inverter (VSI) converters (Fig. 2): In VSI converters, the rectifier consists of a diode-bridge and the DC link consists of a shunt ...
The successful application of bubble CPAP requires elaborate nursing care. [6] There is a learning curve to the implementation of the bubble CPAP respiratory approach that requires a team effort. [2] Respiratory therapists are important members of the team. The system has to be snugly fitted and stationed on the infant's head.
Psychoanalytic infant observation usually involves observing an infant and mother weekly over a two-year period beginning soon after birth until the child's second birthday. This naturalistic form of experiential enquiry provides a unique opportunity to sharpen and extend the observational skills of future therapists. [ 5 ]
Data was studied from the BSID-II tests of 344 ELBW infants admitted to the neonatal intensive care unit at the Rainbow Infants and Children's Hospital in Cleveland, OH from 1992 to 1995. [8] It was found that the predictive validity of a subnormal MDI for cognitive function at school age is poor but better for ELBW children who have ...