Journal of Research of the National Institute of Standards and Technology articles from September 2004

Journal of Research of the National Institute of Standards and Technology archives from September 2004

Optical diffraction in close proximity to plane apertures. III. Modified, self-consistent theory.
September 1, 2004... The classical theory of diffraction at plane apertures illuminated by normally incident light is modified so that diffraction on the source side of the screen is taken into consideration and the energy transport across the aperture plane is...

Development of a high throughput method incorporating traditional analytical devices.
September 1, 2004... A high-throughput (high throughput is the ability to process large numbers of samples) and companion informatics system has been developed and implemented. High throughput is defined as the ability to autonomously evaluate large numbers of...

Determining the uncertainty of x-ray absorption measurements.
September 1, 2004... X-ray absorption (or more properly, x-ray attenuation) techniques have been applied to study the moisture movement in and moisture content of materials like cement paste, mortar, and wood. An increase in the number of x-ray counts with time at...

Analytical representations of elastic moduli data with simultaneous dependence on temperature and porosity.
September 1, 2004... An analytical model providing simultaneous, self-consistent representations of the temperature and porosity dependence of the elastic and bulk moduli of polycrystalline ceramics is applied to data compiled from the literature for 24 oxide...

Electron-impact cross sections for ground state to np excitations of sodium and potassium.
September 1, 2004... Cross sections for electron impact excitation of atoms are important for modeling of low temperature plasmas and gases. While there are many experimental and theoretical results for excitation to the first excited states, little information is...

Stability comparison of recordable optical discs--a study of error rates in harsh conditions.
September 1, 2004... The reliability and longevity of any storage medium is a key issue for archivists and preservationists as well as for the creators of important information. This is particularly true in the case of digital media such as DVD and CD where a...