Coupling maintenance requires a regularly scheduled inspection of each coupling. The Moreno coupler is good for tight coupling applications. The first is a direct electrical connection known as conductive coupling. This reduces losses from electromagnetic radiation and inductive coupling. The magnetic field acts like a mechanical coupling between the armatures. This is modified form of the protected type flange coupling. Resonance Raman spectroscopy involves a kind of vibronic coupling. Current understanding of the mechanism for the nickel-catalyzed coupling is limited. Two threaded holes are provided in order to lock the coupling in position. Ionic polymers also have a low electromechanical coupling. This energy rotates the turbine which powers the compressor via a mechanical coupling. This can achieve high efficiencies at greater distances than nonresonant inductive coupling. This is achieved by treating a fiber with both diazoic and coupling components. These devices make use of inductive coupling to recharge batteries. Activating reagents include phosphoryl chloride and peptide coupling reagents.