Gyro (food) fatty enough, strips of fat are added so that the roasting meat always remains moist and crisp. The rate of roasting can be adjusted by varying the strength of the heat, the distance between the heat and the meat, and the speed of the spit rotation, allowing the cook to adjust to varying rates of consumption. The outside of the meat is sliced vertically in thin, crisp shavings when done. In Greece it is generally served in an oiled, lightly grilled piece of pita, rolled up with sliced tomatoes, chopped onions, fries, and tzatziki. Gyro (food) A gyro or gyros
Slowly varying envelope approximation Slowly varying envelope approximation In physics, the slowly varying envelope approximation (SVEA, sometimes also called slowly varying amplitude approximation or SVAA) is the assumption that the envelope of a forward-travelling wave pulse varies slowly in time and space compared to a period or wavelength. This requires the spectrum of the signal to be narrow-banded—hence it also referred to as the narrow-band approximation. The slowly varying envelope approximation is often used because the resulting equations are in many cases easier to solve than the original equations, reducing the order of—all or some of—the highest-order partial derivatives. But the validity of the