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Journals

Partitioning of Persistent Organic Pollutants (POPs) between Blubber and Blood of Wild Bottlenose Dolphins: Implications for Biomonitoring and Health

June 15, 2010

Author(s)

Jennifer Yordy, John R. Kucklick, Randall S. Wells, Brian C. Balmer, Lori Schwacke, Teresa Rowles

Biomonitoring of wild cetaceans for persistent organic pollutants (POPs) is heavily reliant on concentrations determined in blubber, and there are few data...

Controlling High Coercivities of Ferromagnetic Nanowires Encapsulated in Carbon Nanotubes

June 15, 2010

Author(s)

Robert D. Shull, Cindi L. Dennis, A. Morelos-Gomez, Florentino N. Lopez-Urias, Emilio N. Munoz-Sandoval, H. Terrones, M. Terrones

Cylindrical ferromagnetic nanowires encapsulated inside multiwalled carbon nanotubes (MWNTs) are synthesized by pyrolizing either ferrocene powder or ferrocene...

Shape comparison between 0.4 υm to 2.0 υm and 20 υm to 60 υm cement particles

June 15, 2010

Author(s)

L Holzer, R Flatt, S.T. Erodgan, Jeffrey W. Bullard, Edward Garboczi

Portland cement powder has a wide particle size distribution, from approximately 0.1 υm to 60 υm. This wide powder size distribution arises via the grinding of...

Real Time Data Acquisition Platform for Pulsed Measurements

June 14, 2010

Author(s)

Sergey V. Polyakov, Alan L. Migdall, Sae Woo Nam

We present an inexpensive and simple data acquisition platform based on Field Programmable Gate Arrays (FPGAs) designed to acquire and characterize fast digital...

FRACTURE OF TOOTH ENAMEL FROM INCIPIENT MICROSTRUCTURAL DEFECTS

June 14, 2010

Author(s)

H Chai, James J. Lee, Brian R. Lawn

We present definitive evidence for crack growth from internal defects called 'tufts' in human enamel. Side walls of slices sawn from extracted human teeth are...

Observation of Transparency of Erbium-doped Silicon nitride in photonic crystal nanobeam cavities

June 14, 2010

Author(s)

Yiyang Gong, Maria Makarova, Selcuk Yerci, Rui Li, Martin Stevens, Burm Baek, Sae Woo Nam, Luca Dal Negro, Jelena Vuckovic

One dimensional nanobeam photonic crystal cavities are fabricated in an Er-doped amorphous silicon nitride layer. Photoluminescence from the cavities around 1...

Comparison of Experimental Techniques for Evaluating the Correction Factor of a Rectangular Waveguide Microcalorimeter

June 13, 2010

Author(s)

Xiaohai Cui, Thomas P. Crowley

We have evaluated the correction factor of a new WR 15 (50 to 75 GHz) rectangular waveguide microcalorimeter with four different techniques. The four methods...

Voltage Distribution and Mechanical Strength in Splice Joints made from as-Manufactured YBCO Coated Conductors

June 11, 2010

Author(s)

Daniel C. van der Laan, Cameron C. Clickner, Robert Duckworth, Y Zhang, Mike Gouge, Chris Rey

With recommendations from wire manufacturers as a starting point, a series of solder joints were fabricated and characterized to determine the best method to...

A 12.5 GHz-Spaced Optical Frequency Comb Spanning >400 nm for Infrared Astronomical Spectrograph Calibration

June 10, 2010

Author(s)

Franklyn J. Quinlan, Gabriel G. Ycas, Steve Osterman, Scott A. Diddams

A 12.5 GHz-spaced optical frequency comb locked to a Global Positioning System disciplined oscillator for near IR spectrograph calibration is presented. The...

Covariance-Based Vector-Network-Analyzer Uncertainty Analysis for Time- and Frequency-Domain Measurements

June 10, 2010

Author(s)

Arkadiusz C. Lewandowski, Dylan F. Williams, Paul D. Hale, Chih-Ming Wang, Andrew M. Dienstfrey

We develop a covariance-matrix-based uncertainty analysis for vector-network-analyzer scattering-parameter measurements. The covariance matrix captures all of...

Trace Headspace Sampling for Quantitative Analysis of Explosives with Cryoadsorption on Short Alumina PLOT Columns

June 10, 2010

Author(s)

Tara Lovestead, Thomas J. Bruno

Bombings and the continuous emergence of new and novel explosive compounds necessitate the need for reliable explosive detection devices. Vapor detection...

Monte Carlo Simulation of Vapor-Liquid Equilibria for Perfluoropropane (R-218) and 2,3,3,3-Tetrafluoropropene (R-1234yf)

June 9, 2010

Author(s)

Eugene Paulechka, Andrei F. Kazakov, Michael D. Frenkel

Thermophysical properties of two refrigerants (perfluoropropane and 2,3,3,3-tetrafluoropropene) were computed using Monte Carlo method with OPLS-AA (Optimized...

Edge structure of epitaxial graphene islands

June 7, 2010

Author(s)

Gregory M. Rutter, N Guisinger, Jason Crain, Phillip N. First, Joseph A. Stroscio

Graphene islands grown epitaxially on 6H-SiC(0001) were studied using scanning tunneling microscopy and spectroscopy. Under specific growth conditions,...

Dark pulse quantum dot diode laser

June 7, 2010

Author(s)

Mingming M. Feng, Kevin L. Silverman, Richard P. Mirin, Steven T. Cundiff

We describe an operating regime for passively mode-locked quantum dot diode laser where the output consists of a train of dark pulses, i.e., intensity dips on a...

Accurate light-time correction due to a gravitating mass

June 7, 2010

Author(s)

Neil Ashby, Bruno Bertotti

This technical paper of mathematical physics arose as an aftermath of the 2002 Cassini experiment, in which the PPN parameter γ was measured with an accuracy ς...

Ultraviolet Weathering of Firefighter Protective Clothing

June 4, 2010

Author(s)

Rick D. Davis, Joannie W. Chin, Chiao-Chi Lin, Sylvain H. Petit

Exposure to simulated ultraviolet sunlight at 50 C and 50 % relative humidity caused a significant deterioration in the mechanical performance of polyaramid...

Modeling and Measurement of Nonlinear Distortion in Software-Defined-Radio Receiver Front Ends

June 4, 2010

Author(s)

Catherine A. Remley, Nuno Carvalho, Pedro Cruz

We evaluate the nonlinear distortion in a software-defined radio front end consisting of a low-noise amplifier followed by an analog-to-digital converter. We...

Enhanced telecom wavelength single-photon detection with NbTiN superconducting nanowires on oxidized silicon

June 3, 2010

Author(s)

Michael G. Tanner, C. M. Natarajan, V. K. Pottapenjara, J. A. O?Connor, R. J. Warburton, Robert Hadfield, Burm Baek, Sae Woo Nam, S. Dorenbos, T. Zijlstra, Teun Klapwijk, Val Zwiller

Superconducting nanowire single-photon detectors (SNSPDs) have emerged as a highly promising infrared single-photon detector technology. Next-generation devices...

Monte-Carlo Reaction Rate Evaluation for Astrophysics

June 2, 2010

Author(s)

Ryan P. Fitzgerald, A. Coc, R Longland, A E. Champagne

We present a new evaluation of thermonuclear reaction rates for astrophysics involving proton and a-particle induced reactions, in the target mass range between...

High-Resolution Neutron Scattering Study of Tb₂Mo₂O₇: A Geometrically Frustrated Spin Glass

June 2, 2010

Author(s)

G. Ehlers, J. E. Greedan, J. R. Stewart, K. C. Rule, P. Fouquet, A. L. Cornelius, C. Adriano, P. G. Pagliuso, Yiming Qiu, Jason S. Gardner

A Critical Compilation of Experimental Data on Spectral Lines and Energy Levels of Hydrogen, Deuterium, and Tritium

June 1, 2010

Author(s)

Alexander Kramida

For more than 50 years, Charlotte Moore's Atomic Energy Levels compilation and its subsequent revisions have been the standard source of reference data for the...

Feasibility of an Accurate Dynamic Standard for Water Flow

June 1, 2010

Author(s)

Iosif I. Shinder, Michael R. Moldover

We used NIST's primary water flow standard to study the feasibility of accurately determining mass flow rates m dot of water "dynamically," that is from the...

Reflection Absorption Infrared Spectroscopy During Atomic Layer Deposition of HfO2 Films From Tetrakis (ethylmethylamido) Hafnium and Water

June 1, 2010

Author(s)

Brent A. Sperling, William A. Kimes, James E. Maslar

Tetrakis(ethylmethylamido)hafnium and water are commonly used precursors for atomic layer deposition of HfO2. Using reflection absorption infrared spectroscopy...

Adding Attributes to Role Based Access Control

June 1, 2010

Author(s)

David R. Kuhn, Edward Coyne, Timothy Weil

Role based access control (RBAC) is a popular model for information security. It helps reduce the complexity of security administration and supports the review...

Standard Reference Materials for Analysis of Dietary Supplements

June 1, 2010

Author(s)

Katherine E. Sharpless, David L. Duewer

NIST, in collaboration with the National Institutes of Health Office of Dietary Supplements (NIH-ODS) and the Food and Drug Administration (FDA) is producing...

A rapid, low-cost preparation of monodisperse niosomes in a microfluidic platform

June 1, 2010

Author(s)

Catherine T. Lo, Andreas Jahn, Wyatt N. Vreeland, Laurie E. Locascio

Niosomes are synthetic membrane vesicles made of self-assembled non-ionic surfactants (i.e. amphiphilic organic compounds). They bear the same properties as...

The Mystery of Clustering in Macromolecular Media

June 1, 2010

Author(s)

Boualem Hammouda

Clustering prevails in water-soluble polymers and biological macromolecules. It has also been observed in polar solvent mixtures. The possible causes of...

A Framework for XML Schema Naming and Design Rules Development Tools

June 1, 2010

Author(s)

Katherine C. Morris

Many organizations are facing enormous challenges today in trying to integrate a wide range of software systems. These systems span the functional areas within...

Theory for Polymer Analysis Using Nanopore-based Single-molecule Mass Spectrometry

June 1, 2010

Author(s)

Joseph E. Reiner, John J. Kasianowicz, Brian J. Nablo, Joseph W. Robertson

Nanometer-scale pores have demonstrated potential as a tool for the electrical detection and characterization of molecules. To provide a physical basis for...

Quality Focus: Certified Reference Materials

June 1, 2010

Author(s)

Katherine E. Sharpless

In June of this year, the final stage of the staggered implementation of current Good Manufacturing Practices (cGMPs) took effect, requiring all domestic and...

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