synopsisA method for measuring the surface energy of solids and for resolving the surface energy into contributions from dispersion and dipole-hydrogen bonding forces has been developed. It is bas& on the measurement of contact angles with water and methylene iodide. Good agreement has been obtained with the more laborious yc method. Evidence for a finite value of liquid-solid interfacial tension at zero contact angle is presented. The method is especially applicable to the surface characterization of polymers.

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Simultaneous profile measurements of the toroidal rotation speed and ion temperature during unbalanced neutral-beam injection in the Tokamak Fusion Test Reactor show that the ion momentum and thermal diffusivities are comparable in magnitude (;t>« 1.5^/) and vary similarly with plasma current and minor radius. The correlation of %$ and Xi is consistent with anomalous transport driven by collisionless electrostatic microinstabilities including ion-temperature-gradient-driven modes (77/ modes) and collisionless trapped-electron modes.