Resent articles by the "Journal of Research of the National Institute of Standards and Technology" from The Free Libraryhttp://www.thefreelibrary.comen-usFarlex, Inc.Thu, 7 Jan 2010 08:05:42 GMT360http://www.thefreelibrary.comhttp://www.thefreelibrary.com/_/static/TFLbyFarlex.gif17565Tue, 1 Sep 2009 00:00:00 http://www.thefreelibrary.com/Calcium+fluoride+precipitation+and+deposition+from+12+mmol%2fL+fluoride...-a0211808230
The effects of different Ca-addition rates on calcium fluoride ([CaF.sub.2]) precipitation and deposition were investigated in 12 mmol/L sodium fluoride solutions to which 0.1 mol/L calcium chloride solution was continuously added at average rates of (5, 7.5, 10, 12.5, 15 or 20) mmol [L.sup.-1] [min.sup.-1]. The changes in ionic fluoride and calcium concentrations, as well...]]>Tue, 1 Sep 2009 00:00:00 http://www.thefreelibrary.com/Uncertainty+calculation+for+spectral-responsivity+measurements.-a0211808229
This paper discusses a procedure for measuring the absolute spectral responsivity of optical-fiber power meters and computation of the calibration uncertainty. The procedure reconciles measurement results associated with a monochromator-based measurement system with those obtained with laser sources coupled with optical fiber. Relative expanded uncertainties based on the methods from the...]]>Tue, 1 Sep 2009 00:00:00 http://www.thefreelibrary.com/Perturbations+from+ducts+on+the+modes+of+acoustic+thermometers.-a0211808228
We examine the perturbations of the modes of the an acoustic thermometer caused by circular ducts used either for gas flow or as acoustic waveguides coupled to remote transducers. We calculate the acoustic admittance of circular ducts using a model based on transmission line theory. The admittance is used to calculate the perturbations to the resonance frequencies and half-widths of...]]>Tue, 1 Sep 2009 00:00:00 http://www.thefreelibrary.com/First-principles+calculation+of+the+third+virial+coefficient+of...-a0211808227
Knowledge of the pair and three-body potential-energy surfaces of helium is now sufficient to allow calculation of the third density virial coefficient, C(T), with significantly smaller uncertainty than that work, we employ the best available pair and three-body potentials for helium and calculate C(T) with path-integral Monte Carlo (PIMC) calculations supplemented by semiclassical...]]>Wed, 1 Jul 2009 00:00:00 http://www.thefreelibrary.com/A+method+for+assigning+priorities+to+United+States+Measurement+System...-a0208326439In 2006, the National Institute of Standards and Technology conducted an assessment of the U.S. measurement system (USMS), which encompasses all private and public organizations that develop, supply, use, or ensure the validity of measurement results. As part of that assessment, NIST collaborated with Energetics Incorporated to identify and authenticate 723 measurement needs that are barriers...]]>Wed, 1 Jul 2009 00:00:00 http://www.thefreelibrary.com/Design+of+the+DEMO+fusion+reactor+following+ITER.-a0208326438Runs of the NSTAB nonlinear stability code show there are many three-dimensional (3D) solutions of the advanced tokamak problem subject to axially symmetric boundary conditions. These numerical simulations based on mathematical equations in conservation form predict that the ITER international tokamak project will encounter persistent disruptions and edge localized mode (ELMS) crashes. Test...]]>Wed, 1 Jul 2009 00:00:00 http://www.thefreelibrary.com/Procedures+for+wavelength+calibration+and+spectral+response...-a0208326437This work describes a procedure for acquiring a spectrum of an analyte over an extended range of wavelengths and validating the wavelength and intensity assignments. To acquire a spectrum over an extended range of wavelengths with a spectrometer with a charge coupled device (CCD) array detector, it is necessary to acquire many partial spectra, each at a different angular position of the...]]>Wed, 1 Jul 2009 00:00:00 http://www.thefreelibrary.com/Characterization+of+probe+dynamic+behaviors+in+critical+dimension...-a0208326436This paper describes a detailed computational model of the interaction between an atomic force microscope probe tip and a sample surface. The model provides analyses of dynamic behaviors of the tip to estimate the probe deflections due to surface intermittent contact and the resulting dimensional biases and uncertainties. Probe tip and cantilever beam responses to intermittent contact between...]]>Fri, 1 May 2009 00:00:00 http://www.thefreelibrary.com/Pass-fail+testing%3a+statistical+requirements+and+interpretations.-a0207018133
Performance standards for detector systems often include requirements for probability of detection and probability of false alarm at a specified level of statistical confidence. This paper reviews the accepted definitions of confidence level and of critical value. It describes the testing requirements for establishing either of these probabilities at a desired confidence level....]]>Fri, 1 May 2009 00:00:00 http://www.thefreelibrary.com/The+detection+of+Lyman+alpha+radiation+formed+by+the+slowing+down+of...-a0207018132
The observation of Lyman alpha (L[alpha]) radiation produced by the end products of the [.sup.3]He (n,tp) reaction has suggested the possibility of a new method of cold thermal neutron detection. In order for this goal to be achieved, a basic understanding of how the L[alpha] radiation is formed and how it may be detected, is needed, The model study described here is an attempt to...]]>Fri, 1 May 2009 00:00:00 http://www.thefreelibrary.com/Method+for+the+characterization+of+extreme-ultraviolet+photoresist...-a0207018131
Outgassing from photoresists illuminated by extreme ultraviolet radiation can lead to degradation of the very expensive multilayer-coated optics in an extreme ultraviolet stepper. Reliable quantification of the various organic molecules outgassed by photoresists has been a challenging goal. We have designed a compact system for this measurement. In the first step, the total number...]]>