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Observations of microstructure changes in several systems and the rate of densification during sintering of magnesium oxide, titanium carbide, and tungsten carbide in the presence of a liquid phase indicate that the densification rate is controlled by dBusion through a liquid W between particles. Dependence of the sintering rate on time, particle size, and temperature are in agreement with predictions. Theoretical estimations of the sintering rate are in reasonable agreement with experimental measurements.

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Using proton-nitrogen double resonance in the laboratory frame, the 14N nuclear quadrupole resonances (NQR) of 2,4(1H,3H)-pyrimidmedione[uracil], 2,3-dihydro-2-thioxo-4(1H)-pyrimidinone[2-thiouracil], 2,4(1H,3H)-pyrimidinedithione[2,4-dithiouracil], and 1,3-dihydro-2H-benzimidazole-2-thione[2-mercaptobenzimidazole] have been measured at room temperature. The NQR parameters of uracil and its sulfur-substituted compounds are interpreted by using the Townes and Dailey theory.