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Journals

Direct measurement of vector polarization-mode dispersion from repeated random data by use of linear optical sampling

March 1, 2010

Author(s)

Paul A. Williams, Tasshi Dennis

Polarization-dependent optical sampling techniques measure the complex electric field, allowing one to monitor the degrading effects of a communication channel...

The wildland-urban interface fire problem - Current approaches and Research Needs

March 1, 2010

Author(s)

William E. Mell, Samuel L. Manzello, Alexander Maranghides, David T. Butry, Ronald G. Rehm

Wildfires that spread into wildland-urban interface (WUI) communities present significant challenges on a number of fronts. In the United States the WUI...

Weight Functions for Biases in Atomic Frequency Standards

March 1, 2010

Author(s)

Jon H. Shirley

Many perturbations that affect atomic frequency standards vary during the period of measurement. To include this time variation, we introduce three time...

Infrared imaging method of measuring growth rate of a hydride phase

March 1, 2010

Author(s)

Zhuopeng Tan

A method of studying growth rate of hydrides using in-situ infrared imaging of wedge-shaped films is presented. Hydrogenation experiments with Pd-capped Mg-Ti...

Life-Cycle Carbon and Cost Analysis of Energy Efficiency Measures in New Commercial Buildings

March 1, 2010

Author(s)

Joshua D. Kneifel

Building energy efficiency has become a top priority due to the recent energy price spikes and increasing concern regarding climate change. It is easier and...

Optical performance monitoring of QPSK data channels by use of neural networks trained with parameters derived from asynchronous constellation diagrams

March 1, 2010

Author(s)

Jeffrey A. Jargon, Xiaoxia Wu, Alan Willner

We demonstrate a technique for optical performance monitoring of quadrature phase-shift keying (QPSK) data channels by simultaneously identifying optical signal...

How Accurate is a Radio Controlled Clock?

March 1, 2010

Author(s)

Michael A. Lombardi

This paper discusses the factors that determine the accuracy of radio controlled clocks. The topics covered including the accuracy of the time signal station...

Pilot Study of Automated Bullet Signature Identification Based on Topography Measurements and Correlations

March 1, 2010

Author(s)

Wei Chu, Jun-Feng Song, Theodore V. Vorburger, James H. Yen, Susan M. Ballou, Benjamin Bachrach

A procedure for automated bullet signature identification is described based on topography measurements using confocal microscope and correlations calculation...

Automated Mapping of Explosives Particles in Composition C-4 Fingerprints

March 1, 2010

Author(s)

Jennifer R. Verkouteren, Jessica L. Staymates, Inho Cho

A method is described to perform automated mapping of RDX particles in C-4 fingerprints. The method employs polarized light microscopy and image analysis to map...

Comparison of Electronics Products Standards for Sustainability

March 1, 2010

Author(s)

Gaurav Ameta, Prabir Sarkar

This paper focuses on electronics product standards in relation to sustainability. Sustainability can be viewed as the ability of the current generation to meet...

Interlaboratory comparison of Helium Low Gas Flow Measurements in the range 10-13 to 10-11 mol/s (10-9 to 10-7 cm3/s)

March 1, 2010

Author(s)

Dana R. Defibaugh, Patrick J. Abbott, James A. Fedchak

An interlaboratory comparison (ILC) of helium low flow measurement capability was recently completed. The comparison was piloted by The National Institute of...

The Influence of Shrinkage-Reducing Admixtures (SRAs) on Moisture Absorption in Cementitious Materials at Early Ages

March 1, 2010

Author(s)

G Sant, A Eberhardt, Dale P. Bentz, W Weiss

The water absorption behavior of cement pastes (w/c = 0.30) containing varying concentrations (i.e., 0 %, 0.2 % and 5 %) of a shrinkage reducing admixture (SRA)...

Classical Trajectories and RRKM Modeling of Collisional Excitation and Dissociation of Benzylammonium and tert Butyl Benzylammonium Ions in a Quadrupole-Hexapole-Quadrupole Tandem Mass Spectrometer

March 1, 2010

Author(s)

Vadim D. Knyazev, Stephen Stein

Collision-induced dissociation of the benzylammonium and the 4-tert butyl benzylammonium ions was studied experimentally in an electrospray ionization...

Trees in the city: estimating the value of street trees in Portland, Oregon using hedonic valuation

February 28, 2010

Author(s)

Geoffrey Donovan, David Butry

We use a hedonic model to simultaneously estimate the effects of street trees on the sales price and the time on market of houses in Portland Oregon. On average...

Using DTSA-II to Simulate and Interpret Energy Dispersive Spectra from Particles

February 27, 2010

Author(s)

Nicholas W. Ritchie

A high quality x-ray spectrum image of a 3.3 μm diameter sphere of K411 glass resting on a copper substrate was collected at 25 keV. The same sample...

The DEMO Quasisymmetric Stellarator

February 26, 2010

Author(s)

Paul R. Garabedian, Geoffrey B. McFadden

The NSTAB code solves differential equations in conservation form, and the TRAN test particle code tracks guiding center orbits in a fixed background, to...

Look at Data to Evaluate Uncertainty: A comment on "Uranium Assay Determination...." by Mathew et al.

February 25, 2010

Author(s)

Ryan P. Fitzgerald

According to the Guide to the Expression of Uncertainty in Measurement (GUM), the evaluation of uncertainty should be based as much as possible on observed data...

Connecting Buildings to Public Safety Networks

February 25, 2010

Author(s)

Alan B. Vinh, David G. Holmberg

The operation of modern commercial buildings uses digital control systems which monitor a vast amount of sensors. These sensors in turn produce data that is...

Measurement of ion cascade energies through resolution degradation of alpha particle microcalorimeters

February 25, 2010

Author(s)

Robert D. Horansky, Greg Stiehl, James A. Beall, Kent D. Irwin, Alex Plionis, Michael W. Rabin, Joel N. Ullom

Atomic cascades caused by ions impinging on bulk materials have remained of interest to the scientific community since their discovery by Goldstein in 1902\cite...

No Calcium Fluoride Found in Plaque Following a NaF Rinse

February 24, 2010

Author(s)

Gerald L. Vogel, Livia M. Tenuta, Gary E. Schumacher, Laurence C. Chow

Background: Plaque calcium fluoride or biological/bacterial calcium-fluoride deposits appear to be the source of cariostatic concentrations of fluoride in...

Detection of Voigt Spectral Line Profiles of Hydrogen Radio Recombination Lines toward Sagittarius B2(N)

February 24, 2010

Author(s)

Francis J. Lovas, Azrael A. von Prochazka, Anthony J. Remijan, Dana S. Balser, Robert S. Ryans, Adele H. Marshall, Frederic R. Schwab, Jan M. Hollis, Phil R. Jewell

We report the detection of Voigt spectral line profiles of radio recombination lines (RRLs) toward Sagittarius B2(N) with the 100-m Green Bank Telescope (GBT)...

Material properties and fractography of an Indirect Dental Resin Composite.

February 23, 2010

Author(s)

Janet B. Quinn, George D. Quinn

Objectives: Determination of material and fractographic properties of a dental indirect resin composite material. Methods: A resin composite (Paradigm, 3M-ESPE...

Superconductor Science and Technology

February 22, 2010

Author(s)

Kent D. Irwin, Michael D. Niemack, Joern Beyer, Hsiao-Mei Cho, William B. Doriese, Gene C. Hilton, Carl D. Reintsema, Daniel R. Schmidt, Joel N. Ullom, Leila R. Vale

Multiplexed superconducting quantum interference device (SQUID) amplifiers have recently enabled the deployment of kilopixel arrays of superconducting...

Uncertainty Analysis of Remote Sensing Optical Sensor Data Guiding Principles to Achieve Metrological Consistency

February 20, 2010

Author(s)

Raju V. Datla, Ruediger Kessel, Allan W. Smith, Raghu N. Kacker, D. B. Pollock

Climate change monitoring requires long time series radiometric measurements using multiple optical sensors in multiple platforms covering the globe over...

Melting and Spread of Polymers in Fire with the Particle Finite Element Method

February 19, 2010

Author(s)

Eugenio Onate, Riccardo Rossi, Sergio R. Idelsohn, Kathryn Butler

A new computational procedure for analysis of the melting and flame spread of polymers under fire conditions is presented. The method, termed Particle Finite...

Quantitative assessment of sample stiffness and sliding friction from force curves in atomic force microscopy

February 18, 2010

Author(s)

Jon R. Pratt, Gordon A. Shaw, Lee Kumanchik, Nancy Burnham

It has long been recognized that the angular deflection of a typical atomic force microscope (AFM) cantilever under normal loading conditions can be profoundly...

Coexisting Magnetic Order and Cooperative Paramagnetism in the Stuffed Pyrochlore Tb_2+xTi_2-2xNb_xO₇

February 18, 2010

Author(s)

Benjamin Ueland, Jason S. Gardner, A. J. Williams, M. L. Dahlberg, J.G. Kim, Yiming Qiu, John R. Copley, P. Schiffer, R J. Cava

Neutron scattering and magnetization measurements have been performed on the stuffed pyrochlore system Tb 2+xTi 2-2xNb xO 7. We find that despite the...

Fluorinated Copolymer Nanoparticles for Multimodal Imaging Applications

February 18, 2010

Author(s)

Mark M. Bailey, Christine M. Mahoney, Elodie Dempah, Jeffrey M. Davis, Matthew Becker, Supang Khondee, Eric J. Munson, Cory J. Berkland

Nanomaterials have emerged as valuable tools in biomedical imaging techniques, such as magnetic resonance imaging (MRI), fluorescence, positron emission...

A Combinatorial Study of Thin Film Process Variables Using Microhotplates

February 17, 2010

Author(s)

David L. Lahr, Joshua L. Hertz, Stephen Semancik

A major goal of materials research over the past two decades has been the development of high throughput methods for rapid discovery and optimization of...

Frequency Comparison of Two High-Accuracy Al+ Optical Clocks

February 17, 2010

Author(s)

Chin-Wen Chou, David Hume, J.C. Koelemeij, David J. Wineland, Till P. Rosenband

We have constructed an optical clock with a fractional frequency inaccuracy of 8.6e-18, based on quantum logic spectroscopy of an Al+ ion. A simultaneously...

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