No abstract

Nanodielectric Surface Performance When Submitted to Partial Discharges in Compressed Air

Can. J. Chem. 56, 1681 (1978.It has been shown previously that certain anesthetics hinder the formation of hydrogen

Samples of a nanodielectric material were synthesized. This bulk material was a mix of epoxy resin, a SiO 2 load and a small fraction of inorganic nanoparticles. The present experiment aimed at determining the effect of the degree of exfoliation on the performance of the nanodielectric surface when exposed to partial discharges. It was found that when the degree of intercalation/exfoliation of the nanoclay is low, the nanodielectric surface did not exhibit superior performance compared to that not containing nanoclay.

The nematic phase n.m.r. spectrum of partially oriented 2,5-dihydrofuran has been analyzed. Corrections to the structure for ring puckering and methylene rocking motions, according to the model due to Malloy, give improved agreement between experimental and calculated direct dipole-dipole coupling constants.Le spectre r.m.n. en phase nkmatique du dihydro-2,s furanne partiellement orient6 a CtC CtudiC. Introduction In four-membered ring compounds the out-ofplane vibrational motion leads to a puckering of the ring. The potential function for this vibration usually has a double minimum, and if the lowest vibrational state lies below the hump the molecule is nonplanar in the ground state. Five-membered rings have two out-of-plane vibrations which can interact to give pseudo-rotation unless there is a double bond in the ring in which case the torsional motion about this bond is at much higher energy and the remaining low frequency out-of-plane motion reduces to a one dimensional puckering. Information about ring puckering motions can be obtained from microwave spectroscopy from the dependence of the moments of inertia on the vibrational quantum number and/or from the actual vibrational absorption spectrum in the far i.r. region. The potential function arises from two contributions: a quartic term, originally predicted by Bell (l), due to ring strain which tends to keep the ring in a planar conformation, and a quadratic term due to torsion about bonds tending to force a nonplanar conformation to avoid eclipsing between adjacent methylene groups. The expression used for the potential function is of the form