The complex dielectric permittivity of trans-I,2-dichlorocyclohexane (DCCH) in supercooled o-terphenyl at audio frequencies is reported. These data are interpreted in terms of a dynamical model involving internal site exchange coupled to a cooperative solvent controlled molecular reorientation process. Fourier transform l3C lines shapes are reported for DCCH in mixed carbon tetrachloride-;leuterochloroform solvent over a range of temperatures encompassing the coalescence region. Details of the site dynamics are extracted from these data via numerical line shape analysis. Reasonable agreement between the parameters common to both models is found.
The experimental methods available for IR drop correction in electrochemical corrosion experiments are briefly reviewed. A computer-controlled system that incorporates several different methods of IR compensation is described and some examples of its performance are presented.
Electrochemical techniques used in the study of corrosion are particularly susceptible to errors due to IR drop when used to study systems such as the corrosion of steel in natural waters. The influence of the electrochemical measurement cell geometry on both the nature and the magnitude of the expected errors is reviewed. Also, the effect of a non uniform current distribution on the working electrode is examined. Expected errors for a range of corrosion rates and water conductivities that are typical of steel in cooling systems are presented for three types of experiments. These experiments are: simple linear polarization (polarization resistance), small range polarization, which is computer-fit to extract the corrosion rate and Tafel parameters, and full polarization.
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