Oscar Mayer Oscar Mayer The Oscar Mayer Company is an American meat and cold cut production company, owned by the American food company Kraft Heinz. It is known for its hot dogs, bologna, bacon, ham and Lunchables products. German immigrant Oscar F. Mayer (1859–1955), born in Kösingen, Germany, began working at a meat market in Detroit, Michigan, and later in Chicago, Illinois. In 1883, Mayer and his brother Gottfried leased the Kolling Meat Market on the near-northside of Chicago. The Mayer brothers sold bratwurst, liverwurst, and weißwurst which was popular in the predominantly German neighborhoods around their Chicago meat market. As the
Slowly varying envelope approximation assumptions which are made need to be justified. For example, consider the electromagnetic wave equation: If k and "ω" are the wave number and angular frequency of the (characteristic) carrier wave for the signal "E"(r,"t"), the following representation is useful: where formula_3 denotes the real part of the quantity between brackets. In the "slowly varying envelope approximation" (SVEA) it is assumed that the complex amplitude "E"(r, "t") only varies slowly with r and "t". This inherently implies that "E"(r, "t") represents waves propagating forward, predominantly in the k direction. As a result of the slow variation of "E"(r, "t"), when