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The article reports that according to Pew Research Center there is a decline in share of middle-income families in the U.S. in 2015 as compared to 1971 along with increase in proportion of high-income families and low-income families. Topics discussed include views of writer Neal Gabler regarding lack of emergency fund in middle class, Congress party being the major reason for middle class shrinkage according to a survey by the trust and impact of the shrinkage on American political attitudes.

The article reports on statistics released by the American Institute of International Education (IIE) on November 11, 2013 as per which approximately 270,000 Chinese students studied in the U.S. colleges and universities in the 2012-2013 academic year. Topics discussed include an increase of 21.4 percent in the number of Chinese students as compared to 2011-2012, China being second to eight countries after India among the number of foreign students in the U.S., and a graph depicting the same.

Many electrical systems can be characterized more authentically by fractional order dynamic systems. The Caputo–Fabrizio and the Atangana–Baleanu fractional derivatives have solved the singularity problem in the Caputo derivative. This work uses Caputo–Fabrizio and Atangana–Baleanu fractional derivatives to model the fractional order Buck-Boost converter in the time domain. On this basis, the mean values of output voltage and inductor current are calculated. The characteristics of Buck-Boost with different orders in different fractional derivatives are analyzed. The results indicate that the Caputo–Fabrizio and Atangana–Baleanu fractional derivatives can be applied to the Buck-Boost converter to increase the design degree of freedom, which provides more choices for describing the nonlinear characteristics of the system. • C–F and A–B derivatives are applied to Buck-Boost converters. • The effects of fractional order on output voltage and current are analyzed. • The differences between the two definitions of converters are analyzed. [ABSTRACT FROM AUTHOR]