Known for hot temperatures, Southern California and the rest of the Southwest United States are undergoing a cold snap that has set records in many areas throughout the region.
Periodogram is the spectrum of a set of time signal usually obtained by fast Fourier transform (FFT). It usually shows frequency as x-axis, and magnit... This page may be out of date.
What is an Ultrasound? An ultrasound, also known as a sonogram, is an imaging study done to look at the structures inside the human body. It is used to screen patients for problems, diagnose illness and disease, and to monitor for changes in condition.