sine wave

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sine wave

Sinusoidal waveform A waveform of periodic oscillations–eg, in alternating current in which the amplitude of each point in the wave is proportional to the sine of the time from a start point Cardiology An EKG finding described in severe hyperkalemia where the 'P' wave disappears and the QRS complex and 'T' wave merge in an oscillating pattern

sine wave

(sīn wāv)
A symmetric wave representing one complete cycle of a single-frequency oscillation; the displacement of mass over time described by using a function from trigonometry, the sine.
See also: pure tone

sine wave

continuous, oscillating stream of energy, generated by an electrosurgery unit; used during surgery to section/separate soft tissues (see Table 1)
Table 1: Forms of electrosurgery
Electrosurgery typeFeatures
ElectrofulgurationUses a high-voltage, dampened waveform to produce a spark that arcs from the probe tip to the skin lesion, causing superficial charring of the lesion surface
ElectrosectionUses an undampened or mildly damped current in conjunction with a very fine emitting electron to produce a cutting effect through soft tissue
ElectrocoagulationUses an intermittent damped current in conjunction with a larger emitting electrode to produce less intense heat over a larger area to induce coagulation and thereby haemostasis
ElectrodesiccationUses an intermittent damped waveform with high voltage and a lower current emitted from a ball electrode to induce cell dehydration and tissue shrinkage
References in periodicals archive ?
When the parameters in the sinusoidal function are estimated, then the cycle or period ([OMEGA]) can be computed as [OMEGA] = [absolute value of 2[pi]/[rho]], if 0 < [rho] < 1 (Brockwell & Davis 2010).
The heat demand on the model is also calculated as a time-dependent sinusoidal function based on the heating requirement of the building; the heat demand curve was fitted as the air temperature with the greatest amount of heat subtracted during the coldest period:
The relation between the scale and the angular frequency of the sinusoidal function is obtained: