No abstract

No abstract

Non-destructive thickness measurements have been made on Brown Pelican and chicken egg shells using ultrasonic thickness measurement techniques. Excellent agreement with the standard dial gage micrometer method is obtained.

The use of highly oriented graphite as a monochromator was recently discussed by Sparks, and has been found to be highly suitable for light-element ( Z⩾15) x-ray spectroscopy. This paper compares the diffracting power of the graphite monochromator with ethylenediamine- d-tantrate and LiF.

Small angle X-ray scattering was used to characterize the structure of sols and gels in the TMOS-MeOH-H2O-CHONH2 system. The scattering curves were analyzed in both the Porod and Guinier regions. A fractal analysis shows that the structure evolves with time and temperature from a linear type polymer to a more highly branched polymer and then towards a “particle”. However, these structural units disappear when the temperature increases above a critical value.