Journal of Research of the National Institute of Standards and Technology articles from September 2008

Journal of Research of the National Institute of Standards and Technology archives from September 2008

Modeling of photochemical reactions in a focused laser beam, II.
September 1, 2008... A method is described for obtaining the rate constant of the photodegradation process of fluorophores illuminated by a focused laser beam. The explicit kinetic equations, describing the population dynamics of excited singlet and triplet states,...

Standardization of [.sup.68] Ge/[.sup.68] Ga using three liquid scintillation counting based methods.
September 1, 2008... A solution containing [.sup.68] Ge in equilibrium with its daughter, [.sup.68] Ga, has been standardized for the first time at the National Institute of Standards and Technology (NIST) using 3 liquid scintillation-based techniques: live-timed...

Long-term stability of the NIST standard ultrasonic source.
September 1, 2008... The National Institute of Standards and Technology (NIST) Standard Ultrasonic Source (SUS) is a system comprising a transducer capable of output power levels up to 1 W at multiple frequencies between 1 MHz and 30 MHz, and an electrical...

Refining the In-Parameter-Order strategy for constructing covering arrays.
September 1, 2008... Covering arrays are structure for well-representing extermely large input spaces and are used to efficiently implement blackbox testing for software and hard-ware. This paper proposes refinements over the In-Parameter-Order strategy (for...

The pole term in linear response theory: an example from the transverse response of the electron gas.
September 1, 2008... In linear response theory, the dielectric response at zero frequency sometimes appears to violate the f-sum rule, which has apparent implications for causality. Here, we study the origin of this apparent discrepancy, focusing on Lindhard's...