Interfaces between Second Language Acquisition and Language Testing Research: Research on interlanguage variation: Implications for language testing

A method for determining transition temperature of a dielectric such as low molecular weight material for example fats, oils, waxes and linear hydrocarbons and high molecular weight materials for example polyvinylidene fluoride, polyethylene, polyvinylchloride, polymethylacrylate and polystyrene which comprises polarizing the dielectric under a high static electric field to form electret, then measuring the depolarization current as temperature thereof being increased, thereby to easily and accurately determine various transition temperatures of the dielectric from the ranges and peaks of the depolarization current.