(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.
coupled rhythm heart beats occurring in pairs, the second beat of the pair usually being a ventricular premature beat. delta rhythm. 1. electroencephalographic waves having a frequency below 3Â½ per second, typical in deep sleep, in infancy, and in serious brain disorders. See also electroencephalography. 2. delta waves.. atrioventricular junctional rhythm. 2. junctional rhythm. nyctohemeral rhythm a day and night rhythm. pendulum rhythm alternation in the rhythm of the heart sounds in which the diastolic sound is equal in time, character, and loudness to the systolic sound, the beat of the heart resembling the tick of a watch.