(Courtesy Oregon Timber Trail) 1  Since 1992, hikers have been able to traverse Oregon north to south using the Pacific Crest Trail, which traces the Cascades from the Bridge of the Gods to the California state line. This summer, you can finally bike across the state, from Hood River to the mines of Modoc County, Calif.
Definition: A delta wave is a type of high amplitude brain wave found in humans. Delta waves have a frequency from one to four hertz and are measured using an electroencephalogram (EEG). These brain waves are thought to emerge from the thalamus and are generally associated with slow-wave sleep (during stages three and four of the stages of sleep.
beta wave. one of several types of brain waves, characterized by relatively low voltage and a frequency of more than 13 Hz. Beta waves are the busy waves of the brain, recorded by electroencephalograph from the frontal and the central areas of the cerebrum when the patient is awake and alert with eyes open. Also called beta rhythm.Compare alpha wave,delta wave,theta wave.