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Search Publications

NIST Authors in Bold

Displaying 27826 - 27850 of 73929

Report on the Key Comparison CCPR K2.a-2003

October 30, 2009
Author(s)
Yoshihiro Ohno, Steven W. Brown, Thomas C. Larason
Under the framework of Mutual Recognition Arrangement (MRA) for national measurements standards and for calibration and measurement certificates issued by National Metrology Institutes (NMIs) signed in 1999, an international comparison of spectral

Poiseuille flow and drop circulation in microchannels

October 29, 2009
Author(s)
Steven D. Hudson
Microfluidics aims to control precisely the transport of fluids and suspended particles or drops. Here we calculate two characteristics of interest in rectangular microchannels, as a function of the cross-sectional aspect ratio. First, we present a

Determination of Perfluorinated Alkyl Acid concentrations in Human Serum and Milk Standard Reference Materials

October 28, 2009
Author(s)
Jennifer M. Lynch, Antonia M. Calafat, Kayoko Kato, Mark E. Ellefson, William K. Reagen, Mark Strynar, Steven G. O'Connell, Craig M. Butt, Scott Mabury, Jeff Small, D.C.G. Muir, Stefan D. Leigh, Michele M. Schantz
Standard Reference Materials (SRMs) are homogeneous, well-characterized materials that are used to validate measurement methods and are critical in improving data quality. Disagreements in perfluorinated alkyl acid (PFAA) concentrations measured in

Effect of Surface Modes on Photon Propagation through Dielectric Bandgaps

October 28, 2009
Author(s)
Natalia Malkova, Sergey V. Polyakov, Alan L. Migdall, Garnett W. Bryant
We investigate the Hartman saturation effect of photons traveling through barriers created by bandgaps of multilayer stacks. In particular, we investigate theoretically the recently observed jumps in photon transversal times due to adding a single layer

Probing Dynamic Fluorescence Properties of Single and Clustered Quantum Dots Towards Quantitative Biomedical Imaging of Cells

October 28, 2009
Author(s)
Hyeong G. Kang, Fuyuki Tokumasu, Matthew L. Clarke, Zhenping Zhou, Jianyong Tang, Tinh Nguyen, Jeeseong Hwang
We present results on dynamical fluorescence properties of bioconjugated nanocrystals or quantum dots (QDs) in different chemical and physical environments. A variety of QD samples were prepared and compared: isolated individual QDs, QDs aggregated into

Microstructure and Mineral Composition of Dystrophic Calcification Associated with the Idiopathic Inflammatory Myopathies

October 26, 2009
Author(s)
Naomi Eidelman, A Boyde, A.J. Bushby, P.G.T. Howell, Jirun Sun, F.W. Miller, P Robey, Lisa Rider
Calcified deposits are present in 30% of children with juvenile dermatomyositis (JDM) and less frequently in adult dermatomyositis (DM). This study aimed to determine the microstructure, composition and stiffness of these deposits. Specimens were analyzed

Scalable arrays of doped silicon RF Paul traps

October 26, 2009
Author(s)
Joseph W. Britton, Dietrich G. Leibfried, James A. Beall, Brad R. Blakestad, Janus H. Wesenberg, David J. Wineland
We report techniques for the fabrication of multi-zone linear RF Paul traps which exploit the machinability and electrical conductivity of bulk doped silicon. The approach was verified by trapping and Doppler cooling 24Mg+ ions in two trap geometries: a

Uncooled, Millimeter-Scale Atomic Magnetometers with Femtotesla Sensitivity

October 26, 2009
Author(s)
John E. Kitching, Svenja A. Knappe, William C. Griffith, Jan Preusser, V Gerginov, Peter D. Schwindt, Vishal Shah, Ricardo Jimenez Martinez
We summarize recent results at NIST to develop high-performance yet highly miniaturized magnetic sensors based on atomic vapors confined in microfabricated alkali vapor cells. These sensors currently achieve sensitivities in the range of a few tens of

Magnetic Noise in a Low-Power Picotesla Magnetoresistive Sensor

October 25, 2009
Author(s)
Stephen E. Russek, Lu Yuan, Sean Halloran, Fabio C. da Silva, David P. Pappas, John M. Moreland, Sy-hwang Liou, Rui Zhang
We present a design of a low power, compact, magnetoresistive sensor. The key features of the design are(1) decreasing the noise by the use of a 64 element magnetic tunnel junction (MTJ) bridge,(2) reducing the magnetic noise by annealing the MTJ sensors

Creating a web-scale video collection for research

October 23, 2009
Author(s)
Paul D. Over, George M. Awad, Alan Smeaton, Colum Foley, James Lanagan
This paper begins by considering a number of important design questions for a web-scale, widely available, multimedia test collection intended to support long-term scientific evaluation and comparison of content-based video analysis and exploitation
Displaying 27826 - 27850 of 73929
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