A discrete time series has associated with it an amplitude spectrum which is a periodic function of frequency. This paper investigates the extent to which a time series can be concentrated on a finite ...

Objective To conduct a systematic review investigating the normal age-related changes in lung function in adults without known lung disease. Design Systematic review. Data sources MEDLINE, Embase and ...

A cow’s salivary glands can make and add 50 to 80 quarts of saliva to the rumen daily. Saliva has several functions in cows. It provides liquid for the microbes. It recirculates nitrogen and minerals.