An interferometric technique for automated profilometry of diffuse objects has been proposed. It is based on the Fourier-fringe analysis of spatiotemporal specklegrams produced by a wavelength-shift interferometer with a laser diode as a frequency-tunable light source. Unlike conventional moiré techniques the proposed technique permits the objects to have discontinuous height steps and/or surfaces spatially isolated from one another. Experimental results are presented that demonstrate the validity of the principle.

Effect of radius of rare-earth ions on the characteris tics of oxynitride glasses in the Ln-Si-Al-O-N sys tems (Ln=Dy, Er, Gd, La, Nd, Sm, Y, Yb) was stu died. The glass transition temperature and the soften ing temperature of these glasses were determined, but their correlation with the radius of rare-earth ions was found to be weak. Oxidation behavior of these glasses was analyzed by assuming that the weight change is proportional to the n-th power of the oxidation time, and it was found that the oxidation exponent, n, tends to decrease and that the oxidation resistance tends to increase with decreasing radius of rare-earth ions. Yb Si-Al-O-N glass had the best oxidation resistance in these rare-earth-containing oxynitride glasses. The oxi dation mechanism of the oxynitride glasses was also discussed.

No abstract

Pressure‐Volume‐Temperature (PVT) behavior of three biodegradable polymers, Polylactide, poly(butylene succinate), and poly(butylene succinate‐co‐adipate), was measured at temperatures from 313 to 493 K and pressures up to 200 MPa. The PVF data in molten state were compared with predicted values of a group contribution modified cell model equation of state (GCMCM EOS). It was found that the GCMCM EOS coupled with one specific volume datum at atmospheric pressure could predict the PVT of the polymer melts to within 0.46% in an average relative deviation of specific volume.

No abstract