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Journals

Simulation of Nanotube Separation in Field-Flow Fractionation (FFF)

April 27, 2007

Author(s)

Frederick R. Phelan Jr., Barry J. Bauer

A Brownian dynamics simulation of prolate ellipsoidal particles is developed to investigate the separation of nanotubes in flow-FFF. The particle motions are...

Chemical Bonding and Many-Body Effects in Site-Specific X-Ray Photoelectron Spectra of Corundum V₂O₃

April 26, 2007

Author(s)

Joseph C. Woicik, M Yekutiel, Thomas L. Nelson, N Jacobson, P Pfalzer, L Kronik

We have used site-specific x-ray photoelectron spectroscopy (SSXPS) to measure chemical bonding, matrix element, and many-body effects in the x-ray...

The 2006 Materials Research Society (MRS) Fall Meeting Report

April 26, 2007

Author(s)

Winnie K. Wong-Ng

The 2006 Materials Research Society (MRS) Fall Meeting took place in the Hynes Convention Center and the Sheraton Boston Hotel, starting the weekend following...

Macroporous Scaffold of Premixed Calcium Phosphate Bone Cement: Mechanical Properties and Cell Response

April 25, 2007

Author(s)

Hockin D. Xu, Lisa E. Carey, Carl Simon Jr.

Calcium phosphate cement (CPC) sets in the bone cavity to form bioresorbable hydroxyapatite and is highly promising for orthopaedic applications. The objective...

Determination of Caffeine, and Caffeine-Related Metabolites in Ephedra-Containing Standard Reference Materials Using Liquid Chromatography With Absorbance Detection and Tandem Mass Spectrometry

April 24, 2007

Author(s)

Jeanice M. Brown Thomas, Katherine E. Sharpless, S. Mitvalsky, Mark Roman, James H. Yen, Mary B. Satterfield

The concentration of caffeine and caffeine-related compounds in two ephedra-containing reference materials have been determined by three independent methods...

Determination of Bitter Orange Alkaloids in Dietary Supplements Standard Reference Materials by Liquid Chromatography With Ultraviolet Absorbance and Fluorescence Detection

April 24, 2007

Author(s)

Karsten Putzbach, Katherine E. Sharpless, Lane C. Sander

Four adrenergic amines [(+/-) synephrine, (+/-) octopamine, tyramine, and n-methyltyramine) were determined in a variety of Citrus aurantium (Bitter Orange)...

Mass Spectrometric Determination of the Predominant Adrenergic Alkaloids in Bitter Orange (Citrus aurantium)

April 24, 2007

Author(s)

B C. Nelson, Karsten Putzbach, Katherine E. Sharpless, Lane C. Sander

The predominant adrenergic alkaloid found in the peel and fruit of bitter orange, Citrus aurantium, is synephrine. Synephrine has thermogenic properties and is...

Microfluidic Directed Formation of Liposomes of Controlled Size

April 24, 2007

Author(s)

Andreas Jahn, Wyatt N. Vreeland, Don DeVoe, Laurie E. Locascio, Michael Gaitan

A new method to tailor liposome size and size distribution in a microfluidic format is presented. Liposomes are spherical structures formed from lipid bilayers...

Ferroelectric Distortion in SrTiO3 Thin Films on Si(001) by X-Ray Absorption Fine Structure: Experiment and First-Principles Calculations

April 23, 2007

Author(s)

Joseph C. Woicik, Eric L. Shirley, C S. Hellberg, S Sambasivan, Daniel A. Fischer, B D. Chapman, E A. Stern, P Ryan, D L. Ederer, H Li

Ti K and Ti L2,3 edge x-ray absorption fine-structure near-edge spectra of SrTiO3 thin films grown coherently on Si(001) reveal the presence of a ferroelectric...

The Dependence of Spurious Charge-Transfer Excited States on Orbital Exchange in TDDFT: Large Molecules and Clusters

April 20, 2007

Author(s)

Rudolph Magyar, S Tretiak

Time-dependent density functional theory (TDDFT) is a powerful tool allowing for accurate description of excited states in many nano-scale molecular systems...

Development of a New High-Stability Transfer Standard Based on Resonant Silicon Gauges for the Range 100 Pa - 130 kPa

April 20, 2007

Author(s)

Jay H. Hendricks, A P. Miiller

The National Institute of Standards and Technology (NIST) has developed a new transfer standard capable of absolute-mode and differential-mode operation in the...

Low-field current-hysteretic oscillations in spin-transfer nanocontacts

April 19, 2007

Author(s)

Matthew Pufall, William Rippard, Michael Schneider, Stephen E. Russek

We have measured spin-transfer-driven, large-amplitude, current-hysteretic, low frequency (less than or equal to} 500 MHz), narrowband oscillations in...

X-Ray Induced Fluorescence Measurement of Segregation in a DyI3 Metal-Halide Lamp

April 19, 2007

Author(s)

T Nimalisuriya, John J. Curry, Craig J. Sansonetti, E J. Ridderhof, S Shastri, A J. Flikweert, W W. Stoffels, M Haverlag, J J. van der Mullen

X-ray induced fluorescence measurements, using high energy synchrotron radiation generated on the Sector 1 Insertion Device beamline at the Advanced Photon...

Augmented Lagrangian Homotopy Method for the Regularization of Total Variation Denoising Problems

April 18, 2007

Author(s)

L A. Melara, Anthony J. Kearsley, R A. Tapia

Depletion of grain-boundary phase and elastic creep deformation upon ultra-long flexural stress rupture experiments of NC-132 silicon nitride

April 18, 2007

Author(s)

H J. Kleebe, W Braue, George D. Quinn

Two MgO-doped Si3N4 specimens (Norton, NC-132) were tested in ultra-long flexure stress rupture experiments with an external load of 266 MPa, i.e., 14.941 and...

Performance of Biometric Quality Measures

April 16, 2007

Author(s)

Patrick Grother, Elham Tabassi

We document methods for the quantitative evaluation of systems that produce a scalar summary of a biometric sample¿s quality. We predicate this on the idea that...

Magnetization and magnetoresistance of common alloy wires used in cryogenic instrumentation

April 16, 2007

Author(s)

Mike Abrecht, Andrew Adare, John (Jack) W. Ekin

We present magnetization and magnetoresistance data at liquid-helium and liquid-nitrogen temperatures for wire materials commonly used for instrumentation...

Conservative Confidence Intervals Based on Weighted Means Statistics

April 15, 2007

Author(s)

Andrew L. Rukhin

For weighted means estimators of the common mean of several normal populations associated (conservative) confidence intervals are constructed. These intervals...

Development of a House Dust Standard Reference Material for the Determination of Organic Contaminants

April 15, 2007

Author(s)

Dianne L. Poster, John R. Kucklick, Michele M. Schantz, Stacy S. Vander-Pol, Stefan D. Leigh, Stephen A. Wise

Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and α-iron

April 15, 2007

Author(s)

Sudook A. Kim, Ward L. Johnson

The elastic constants and internal friction of induction hardened and unhardened SAE 1050 plain-carbon steel were determined by acoustic resonance spectroscopy...

Cancellation of the Collisional Frequency Shift in Caesium Fountain Clocks

April 13, 2007

Author(s)

K Szymaniec, W Chalupczak, Eite Tiesinga, Carl J. Williams, S Weyers, R. Wynands

We have observed that the collisional frequency shift in primary caesium fountain clocks varies with the clock state population composition and, in particular...

Synthesis and Single-Crystal X-Ray Diffraction Studies of New Framework Substituted Type II Clathrates, Cs₈Na₁₆Ag_xGe_136-x (x

April 13, 2007

Author(s)

Matthew Beekman, Winnie Wong-Ng, James A. Kaduk, Alexander J. Shapiro, George S. Nolas

New inorganic type II clathrates with Ag atoms substituting for framework Ge atoms, Cs8Na16AgxGe136-x (x = 0, 5.9, and 6.7), have been synthesized by reaction...

Practical spatial resolution limits of high-resolution fibre Bragg grating sensors using layer peeling

April 13, 2007

Author(s)

Robert J. Espejo, Shellee D. Dyer

Inverse scattering methods such as layer peeling have been shown to reconstruct the longitudinal refractive index of fiber Bragg gratings with very high...

A Study of the Packing Density and Molecular Orientation of Bimolecular Self-Assembled Monolayers of Aromatic and Aliphatic Organosilanes on Silica

April 12, 2007

Author(s)

M B. Smith, K Efimenko, Daniel A. Fischer, S E. Lappi, P E. Kilpatrick, Jan Genzer

Bimolecular self-assembled monolayers (SAMs) of aromatic and aliphatic chlorosilanes were self-assembled onto silica and their characteristics were established...

Particle and Photon Detection for a Neutron Radiative Decay Experiment

April 11, 2007

Author(s)

Thomas R. Gentile, Maynard S. Dewey, Hans P. Mumm, Jeffrey S. Nico, Alan K. Thompson, T E. Chupp, R Cooper, B M. Fisher, I Kremsky, F E. Wietfeldt, K G. Kiriluk, E Beise

We present the particle and photon detection methods employed in a program to observe neutron radiative beta-decay. The experiment is located at the NG-6 beam...

Towards Industrial Scale Fabrication of Nanowire-Based Devices

April 11, 2007

Author(s)

Babak Nikoobakht

The key requirements for mass fabrication of nanodevices are directed positioning and alignment of nanoparticles (e.g., nanowires) with known registries on a...

Nonthermal continuum toward Sagittarius B2(N-LMH)

April 11, 2007

Author(s)

J M. Hollis, P R. Jewell, A Remijan, Francis J. Lovas

An analysis of continuum antenna temperatures observed in theGBTspectrometer bandpasses is presented for observations toward Sgr B2(N-LMH). Since 2004, we have...

Objective Test and Performance Measurement of Automotive Crash Warning Systems

April 10, 2007

Author(s)

Sandor S. Szabo, Richard J. Norcross, Joseph A. Falco

The National Institute of Standards and Technology (NIST), under an interagency agreement with the United States Department of Transportation (USDOT), is...

Measurement of excited-state transitions in cold calcium atoms by direct femtosecond frequency-comb spectroscopy

April 6, 2007

Author(s)

Jason Stalnaker, Yann LeCoq, Tara M. Fortier, Scott A. Diddams, Christopher W. Oates, Leo W. Hollberg

We apply direct frequency-comb spectroscopy, in combination with precision cw spectroscopy, to measure the 4s4 p 3P 1 – 4s5s transition frequency in cold...

Interphase Effects in Dental Nanocomposites Investigated by Small-Angle Neutron Scattering

April 6, 2007

Author(s)

K S. Wilson, Andrew J. Allen, N Washburn, Joseph M. Antonucci

Small angle neutron scattering (SANS) was used to assess nanoparticle dispersion morphologies and nanoscale interphase characteristics in polymer composites...

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