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Journals

DETERMINATION OF THE LIQUID SCINTILLATION COUNTING INEFFICIENCY (WALL EFFECT) FOR ALPHA EMITTERS, USING THE ALPHA-GAMMA ANTICOINCIDENCE METHOD

July 19, 2011

Author(s)

Ryan P. Fitzgerald, Anne M. Forney

The wall effect in liquid scintillation (LS) counting is the loss of efficiency in the case that an alpha-particle hits a surface (wall or air) before...

Expanding the Capabilities of Microfluidic Gradient Elution Moving Boundary Electrophoresis for Complex Samples

July 18, 2011

Author(s)

Elizabeth A. Strychalski, David J. Ross, Alyssa Henry

Gradient elution moving boundary electrophoresis (GEMBE) is a robust, continuous injection separation technique that uses electrophoresis to drive electrically...

Far infrared and Terahertz thermal detectors for radiometry using a carbon nanotube array

July 18, 2011

Author(s)

John H. Lehman, Erich N. Grossman

We present a description of a 1.5 mm long, vertically aligned carbon nanotube array (VANTA) on a thermopile, and separately on a pyroelectric detector. Three...

Expanding the capabilities of microfluidic gradient elution moving boundary electrophoresis for complex samples

July 18, 2011

Author(s)

Alyssa Henry, David J. Ross, Elizabeth Strychalski

Gradient elution moving boundary electrophoresis (GEMBE) is a robust continuous injection separation technique that uses electrophoresis to drive electrically...

Incorporation of Defects into the Central Atoms Model of a Metallic Glass

July 17, 2011

Author(s)

Eric Lass, Aiwu Zhu, Gary J. Shiflet, S J. Poon

The central atoms model (CAM) of a metallic glass is extended to incorporate thermodynamically stable defects, similar to vacancies in a crystalline solid...

Stiffness, strength, and ductility of thin films and membranes - A combined wrinkling-cracking methodology

July 15, 2011

Author(s)

Jun Y. Chung, Junghyun Lee, Kathryn Beers, Christopher Stafford

Polymer membranes are at the core of a diverse set of technologies critical to our global health and security, ranging from energy production to water...

Toxic effects and uptake of fullerenes spiked to sediments by Lumbriculus variegatus

July 13, 2011

Author(s)

Jussi Parkinen, Elijah Petersen, Matti Lepp?nen, Jarkko Akkanen

Effects of fullerene-spiked sediment on a benthic organism, Lumbriculus variegatus were investigated. Survival, growth, reproduction, and feeding rates were...

In Situ Gas Phase Measurements During Metal Alkylamide Atomic Layer Deposition

July 12, 2011

Author(s)

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

Metal alkylamide compounds, such as tetrakis(ethylmethylamido) hafnium (TEMAH), represent a technologically important class of metalorganic precursors for the...

A semicontinuum model for Si(x)Ge(1-x) alloys: calculation of their elastic characteristics and the strain field at the free surface of a semi-infinite alloy

July 11, 2011

Author(s)

Vinod K. Tewary, Mark D. Vaudin

A semicontiuum Greens-function-based model is proposed for analysis of averaged mechanical characteristics of Si(x)Ge(1-x). The atomistic forces in the model...

State Resolved THz Spectroscopy and Dynamics of Crystalline Peptide/Water Systems

July 11, 2011

Author(s)

Zeeshan Ahmed, Shin G. Chou, Karen M. Siegrist, David F. Plusquellic

State resolved THz studies of crystalline peptides and their hydrates have provided precise measures of the infrared active phonon modes that reflect motions on...

Ferrocene as a Hydrophobic Templating Agent with Pyrogallol[4]arenes

July 11, 2011

Author(s)

Andrew V. Mossine, Harshita Kumari, Drew A. Fowler, Andrew K. Maerz, Steven R. Kline, Charles L. Barnes, Jerry L. Atwood

Cocrystallization of C-methylpyrogallol[4]arene (PgC1) and ferrocene in a methanolic solution led to the formation of two distinct crystalline products...

Rapid-Heating of Ionic Energetic Materials using a Micro-Differential Scanning Device

July 10, 2011

Author(s)

Nicholas W. Piekiel, Richard E. Cavicchi, Michael R. Zachariah

We employ a microcalorimeter device to study the thermal decomposition of organic energetic materials at very high heating rates. The compact size of this...

Small fluctuations in epitaxial growth via conservative noise

July 7, 2011

Author(s)

Paul N. Patrone, Rongrong Wang, Dionisios Margetis

We study the combined effect of growth (material deposition from above) and nearest-neighbor entropic and force-dipole interactions in a stochastically...

Synchrotron radiation-based bilateral intercomparison of ultraviolet source calibrations

July 7, 2011

Author(s)

Uwe Arp, Zhigang Li, Ping-Shine Shaw, Mathias Richter, Roman Klein, Wolfgang Paustian, Reiner Thornagel

We report on a successful bilateral inter-comparison between the Physikalisch-Technische Bundesanstalt (PTB) and the National Institute of Standards and...

Sideband cooling of micromechanical motion to the quantum ground state

July 6, 2011

Author(s)

John Teufel, Tobias Donner, Dale Li, Michael S. Allman, Katarina Cicak, Adam Sirois, Jed D. Whittaker, Konrad Lehnert, Raymond Simmonds

The advent of laser cooling techniques revolutionized the study of many atomic-scale systems, fuelling progress towards quantum computing with trapped ions and...

Damping phenomena in Co₉₀Fe₁₀/Ni multilayers and alloys

July 6, 2011

Author(s)

Justin M. Shaw, Hans T. Nembach, Thomas J. Silva

We used perpendicular ferromagnetic resonance to measure the damping parameter in Co 90Fe 10/Ni multilayers over a wide range of layer thicknesses. The magnetic...

Absolute transition frequencies and quantum interference in a frequency comb based measurement of the 6,7Li D lines

July 6, 2011

Author(s)

Craig J. Sansonetti, Clayton Simien, John D. Gillaspy, Joseph N. Tan, Samuel M. Brewer, Roger C. Brown, Saijun Wu, James V. Porto

Optical frequencies of the D lines of 6,7Li were measured with a relative accuracy of 5x10-11 using an optical comb synthesizer. Quantum interference in the...

Using Cross-Evaluation to Evaluate Interactive QA Systems

July 5, 2011

Author(s)

Emile L. Morse, Ying Sun, Paul B. Kantor

Abstract: In this paper, we report on an experiment to assess the possibility of rigorous evaluation of interactive Question-Answering (QA) systems using the...

Determination of the quantum yield of the ferrioxalate and KI/KIO3 actinometers and a method for the calibration of radiometer detectors

July 5, 2011

Author(s)

J R. Bolton, Michaela I. Stefan, Ping-Shine Shaw, Keith R. Lykke

Abstract: The quantum yields for two popular actinometers have been determined using the tunable laser light source at the National Institute for Standards and...

IMPACT OF CLASSICAL ASSUMPTIONS IN MODELLING A MICROCHANNEL GAS COOLER

July 5, 2011

Author(s)

Santiago Martinez-Ballester, Jose M. Corberan, Jose Gonzalvez-Macia, Piotr A. Domanski

Most of the current air-to-refrigerant heat exchanger models use the classic ε-NTU approach. These models do not account for 2D longitudinal heat conduction in...

Four-color laser white illuminant demonstrating high color-rendering quality

July 4, 2011

Author(s)

Alexander Neumann, Jonathan Wierer , Wendy L. Davis, Yoshi Ohno, Steve Brueck, Jeff Tsao

Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors. Solid-state lighting based on lasers would offer significant advantages...

Quantum superposition of a single microwave photon in two different colour states

July 3, 2011

Author(s)

Eva A. Zakka-Bajjani, Francois E. Nguyen, Minhyea Lee, Leila R. Vale, Raymond Simmonds, Joe Aumentado

The ability to manipulate photonic states is an important tool for quantum information processing. In cavity quantum electrodynamics (QED), coupling between...

GaN nanowires grown by molecular beam epitaxy

July 1, 2011

Author(s)

Kristine A. Bertness, Norman A. Sanford, Albert Davydov

The unique properties of GaN nanowires grown by molecular beam epitaxy are reviewed. These properties include defect-free growth mode with no residual strain...

Mass Spectrometry Characterization for Chemoenzymatic Glycoprotein Synthesis

July 1, 2011

Author(s)

John E. Schiel, Mark S. Lowenthal, Karen W. Phinney

Glycoproteins exist as heterogeneous mixtures of glycoforms due to glycosylation at multiple sites with various glycans. The glycosylation pattern has...

Stable isotope-labeling of DNA repair proteins, and their purification and characterization

July 1, 2011

Author(s)

M Miral Dizdar, Pawel Jaruga, Prasad T. Reddy, Bryant C. Nelson, Mark S. Lowenthal

Reduced DNA repair capacity is associated with increased risk for a variety of disease processes including carcinogenesis. Thus, DNA repair proteins have the...

Thermal Response Simulation for Tuning PID Controllers in a 1016 mm Guarded Hot Plate Apparatus

July 1, 2011

Author(s)

Robert R. Zarr, William C. Thomas

A mathematical model has been developed and used to simulate the controlled thermal performance of a large guarded hot-plate apparatus. The control system...

Interlayer Distance Dependence of Thickness Fluctuations in a Swollen Lamellar Phase

July 1, 2011

Author(s)

Michihiro Nagao, Sukhum Chawang, Takumi Hawa

Thickness fluctuations in a swollen lamellar structure, composed of a non-ionic surfactant, water and oil has been characterized by means of small-angle neutron...

Porous Graphene Oxide Frameworks: Synthesis and Gas Sorption Properties

July 1, 2011

Author(s)

Gadipelli Srinivas, Jacob Burress, Jamie Ford, Taner Yildirim

We report detailed synthesis of a range of porous graphene oxide frameworks (GOFs) by expansion of graphene oxide (GO) sheets with various linear boronic acid...

Persistent Organic Pollutant Concentrations in Fat, Blubber, Blood and Eggs of Leatherback Turtles with Confirmation of Maternal Transfer

July 1, 2011

Author(s)

Jennifer M. Lynch, John R. Kucklick, Kelly R. Stewart, Ryan Templeton, Chris Johnson

Among contaminant studies in reptiles, turtles, and in particular sea turtles, are poorly represented. To assess threats to this endangered species, it is...

Evaluating the characteristics of multiwall carbon nanotubes

July 1, 2011

Author(s)

John H. Lehman, M. Terrones, Elisabeth Mansfield, Katie Hurst, Vincent Muenier

During the past 20 years, multiwall carbon nanotubes (MWCNTs) have become an important industrial material. Hundreds of tons are produced each year. This review...

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