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.
Firefighters marching in a parade. Synchronization is the coordination of events to operate a system in unison. The familiar conductor of an orchestra serves to keep the orchestra in time. Systems operating with all their parts in synchrony are said to be synchronous or in sync; those which are not are asynchronous. Today, synchronization can occur on a global basis through the GPS-enabled timekeeping systems (and similar independent systems operated by the EU and Russia).