Studies percolation and conduction in a randomly diluted network in which the occupied bonds may be either resistor-like, transmitting connectivity in both directions along a bond, or diode-like, transmitting in only one direction. This system exhibits novel phase transitions signalling the onset of infinite clusters with either isotropic or unidirectional connectivity. Position-space renormalisation group methods are applied to map out the phase diagram and calculate exponents associated with these phase transitions.
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S. Redner (1981) studied this question.
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