ABSTRACT. The well-known Van der Corput estimate of a trigonometric sum by the third derivative is sharpened.KEY WORDS: trigonometric sum, Van der Corput estimate.Consider the trigonometric sum

Tiny dew droplets deposited on a copper plate were controlled constantly by a developed control technique using scattered laser light for studying initial dropwise condensation. The technique employs proportional control combined with shifting movement by an integrator. The droplets were controlled for 60 min at almost constant diameters in a range from only a few micrometers to tens of micrometers and were almost hemispherical in the initial condensation at room temperature.

No abstract

No abstract