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A decomposition of the field of the wave equation in three dimensions is suggested. This wave splitting decomposes the field into two components such that in free space simple propagation properties are obtained. The inhomogeneous region is assumed to have a phase velocity variation that varies only in the radial coordinate r from the origin. The suggested wave splitting is a generalization of the
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This paper reminds the analog designer of the possible stability problems encountered when simulating strongly resonating circuits in the time domain. The warping of circuit pole positions in different numerical integration algorithms is reviewed, and it is shown that all time domain simulation algorithms suffer from this effect, including Simulink, time-domain steady-state, and a harmonic balance
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Wood is susceptible to decay if it is exposed to high moisture contents and certain temperatures during long periods of time. In rain exposed structures, decay often starts close to joints since the joints can act as water traps where water stays after rain events. Service life prediction models for outdoor wood structures require knowledge about the moisture and temperature conditions in the wood