In memory of prof. dr. Janko Jamnik. Abstract The ratio of conductances through carbon-ring based molecules are calculated for various positions of source-drain electrode leads on the molecule. These ratios are usually integers the so-called magic numbers. We find that deviations of the magic number ratios are either zero or quadratic in ratios of tight-binding model parameters. Povzetek Razmerja prevodnosti skozi molekule, sestavljene is obro~ev ogljikovih atomov, smo izra~unali za razli~ne

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... figuracije priklju~kov elektrod med izvorom in ponorom. Obi~ajno so ta razmerja cela {tevila, t.i., magi~na {tevila. Ugotovili smo, da s spreminjanjem parametrov v okviru modela tesne vezi ostanejo magi~na {tevila ali nespremenjena, ali pa so od parametrov odvisna kvadrati~no.