Heavyside function

Differentiation of the product of the stress and the Heavyside function gives. 

Here H is the Hamiltonian of the system and 6 is the heavyside function.) It should be noted that, due to the quantum continuity equation, the flux through any surface separating reactants from products has to be identical. 

A function closely related to the 5-function is the so called 0-function or step function, also known as the Heavyside function ... 

An interesting variance of impedance spectroscopy is the time domain spectroscopy (53) in which a voltage function (a Heavyside function, for example) is sent along a line of fixed constant impedance. At... 

The ESA sets in with a step at time zero modeled by the Heavyside function... 

Considering only the cases where the Heavyside unit step functions in (3.69) differ from zero (i.e., the nontrivial case where r overlaps in the y direction with the reference element), it is observed that (3.82) and (3.83) can never be true unless the test element is in contact with one (or more) of the reference array elements. Since this is not the case, the first term in (3.80) may be dropped. 

The quantity H(t) is the Heavyside or unit step function (See appendix A) and is defined to be. 

The quantity H(x) is a continuous function defined as the relaxation spectrum and is often used in polymer literature. (Note this term should not be confused with the Heavyside step function used earlier to represent a step input.)... 

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