Visual observations of the turbulent fluctuations suggested that a low frequency response flat down to 0.2 hertz would have been useful.
This is virtually always the case for real-time simulations with refresh rates of several hundred hertz.
Since the 1960s it was recognised that the alpha, beta and theta types have a link to different hertz levels that can be associated with different mental states.
This frequency varies linearly with chemical concentration and will change by up to several hundred hertz when exposed to a strong concentration of the target chemical.
It is not cost effective to convert a complete railway system to the standard of 25,000 volts at 50 hertz, which is the preferred methodology nowadays.
This jet of gas occurs for a very brief duration, about 0.02 seconds, and at high frequency: 4-11 hertz.
High-frequency (typically 20,000 hertz) ultrasonic vibrations are locally applied to metal foil materials, held together under pressure, to create a solid-state weld.
Since the numerator is usually in hertz, and the denominator in megahertz, delta is expressed in ppm.
