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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 ...
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.
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 ...
Margaret Frances Jane Lowenfeld (4 February 1890 – 2 February 1973) was a British pioneer of child psychology and play therapy, a medical researcher in paediatric medicine, and an author of several publications and academic papers on the study of child development and play. Lowenfeld developed a number of educational techniques which bear her ...
Virginia Axline adapted Carl Rogers's theories to child therapy in 1946 and is widely considered the founder of this therapy. [38] Different techniques have since been established that fall under the realm of non-directive play therapy, including traditional sandplay therapy, play therapy using provided toys and Winnicott's Squiggle and Spatula ...
It comprises case studies on infant and young child observation, research papers, and articles focusing on wider applications of the psychoanalytic observational method, including its relevance to reflective professional practice in fields such as social work, education and nursing. Papers are peer-reviewed.
Parent–child interaction therapy (PCIT) is an intervention developed by Sheila Eyberg (1988) to treat children between ages 2 and 7 with disruptive behavior problems. [1] PCIT is an evidence-based treatment (EBT) for young children with behavioral and emotional disorders that places emphasis on improving the quality of the parent-child ...
A cycloconverter constructs an output, variable-frequency, approximately sinusoid waveform by switching segments of the input waveform to the output; there is no intermediate DC link. With switching elements such as SCRs, the output frequency must be lower than the input.