Historically, foamy urine is considered a warning sign for probable kidney disease. Nephrologists and urologists traditionally refer to it as a marker of proteinuria. Upon history and physical examination, many clinicians ask whether the patient has noticed foamy urine, and some even document a lack of it as a significant negative finding.
Phase synchronization. Phase synchronization is the process by which two or more cyclic signals tend to oscillate with a repeating sequence of relative phase angles. Phase synchronisation is usually applied to two waveforms of the same frequency with identical phase angles with each cycle. However it can be applied if there is an integer relationship of frequency, such that the cyclic signals share a repeating sequence of phase angles over consecutive cycles.
Phase. When capacitors or inductors are involved in an AC circuit, the current and voltage do not peak at the same time. The fraction of a period difference between the peaks expressed in degrees is said to be the phase difference. The phase difference is ELI the ICE man helps to remember the sign of the phase.