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resonant.freq

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I have recently been attempting to understand negative resistance circuits(on a practical level at least to start). I've pulled up a few websites giving actual circuits to demonstrate the principle, but still can't quite understand it. Every circuit example so far shows either a pulsed or ac power source and is basicly an rlc circuit that oscillates at a frequency dependant on the values of the capacitor and inductor. such as > http://jlnlabs.online.fr/cnr/negosc.htm (example only). In my mind in a circuit like that its not all that clear exactly how and if negative resistance actually shows its self.

To cut a long story short what I would love to know is there an actual dc only(not oscillating) circuit that can be built to either... Increase the apparent voltage applied to an inductive component(coil) AND/OR decrease the apparent resistance of that coil(thus allowing more current to flow than you would expect given the power source, resistance, and ohms law).

Thanks for any help on this subject as I am still coming to terms understanding it.

cheers

Andrew