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Journals

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...

The Effects of Humidity and Surface Free Energy on Adhesion Force between AFM Tip and a Silane Self-Assembled Monolayer Film

February 17, 2010

Author(s)

Chien-Chao Huang, Lijiang Chen, , Xiaohong Gu, Minhua Zhao, Tinh Nguyen, Sanboh Lee

The relationship between AFM probe-sample adhesion force and relative humidity (RH) at five different levels of surface free energy (γs) of an organic self...

Optimized continuum from a photonic crystal fiber for broadband time-resolved coherent anti-Stokes Raman scattering

February 17, 2010

Author(s)

Young Jong Lee, Sapun Parekh, Yeon Ho Kim, Marcus T. Cicerone

We demonstrate that an optimized 2-pulse broadband coherent anti-Stokes Raman scattering (CARS) technique can be used to simultaneously measure vibrational...

Simultaneous Measurement of Magnetic Vortex Polarity and Chirality using Scanning Electron Microscopy with Polarization Analysis (SEMPA)

February 16, 2010

Author(s)

Seok-Hwan Chung, Daniel T. Pierce, John Unguris

The magnetic vortex structure is an equilibrium configuration frequently found in patterned magnetic nanostructures. It is characterized by an in-plane curling...

Evidence for the involvement of DNA repair enzyme NEIL1 in nucleotide excision repair of (5'R)- and (5'S)-8,5'-Cyclo-2'-deoxyadenosines

February 16, 2010

Author(s)

Pawel Jaruga, Yan Xiao, Vladimir Vartanian, R S. Lloyd, Miral M. Dizdar

The DNA repair enzyme NEIL1 is a DNA glycosylase that is involved in the first step of base excision repair (BER) of oxidatively induced DNA damage. NEIL1...

Tuning magnetostatic interaction in single-crystalline nanodot arrays with in-plane easy axes

February 16, 2010

Author(s)

Jung Phil Seo, Tae Hwan Kim, Seok-Hwan Chung, Youngtaek Oh, Jaehyuk Choi, Young Kuk

We have fabricated an ultrahigh-vacuum-processed, ordered, single-crystalline nanodot array. By mapping the magnetization of the nanodots with spin polarized...

Heralded, pure-state single-photon source based on a Potassium Titanyl Phosphate waveguide

February 15, 2010

Author(s)

Zachary H. Levine, Jingyun Fan, Jun Chen, Alexander E. Ling, Alan L. Migdall

WWe analyze the generation of single spatial mode, spectrally uncorrelated photon pairs via type II spontaneous parametric downconversion in a Potassium Titanyl...

Ultrafast Terahertz Spectroscopy for Measuring Carrier Dynamics in Nanoscale Photovoltaic Materials

February 15, 2010

Author(s)

Okan Esenturk, Paul A. Lane, Joseph S. Melinger, Edwin J. Heilweil

Femtosecond pump-probe methods are useful tools for investigating transient electronic and vibrational states of conducting materials and molecular...

Steady-state and transient photoconductivity in c-axis GaN nanowires grown by nitrogen-plasma-assisted molecular beam epitaxy

February 12, 2010

Author(s)

Norman A. Sanford, Paul T. Blanchard, Kristine A. Bertness, Lorelle Mansfield, John B. Schlager, Aric W. Sanders, Alexana Roshko, Beau Burton, Steven George

Analysis of steady-state and transient photoconductivity measurements at room temperature performed on c-axis oriented GaN nanowires yielded estimates of free...

Challenges in Continuum Modeling of Intergranular Fracture

February 11, 2010

Author(s)

Valerie R. Coffman, James P. Sethna

Intergranular fracture in polycrystals is often simulated by finite elements coupled to a cohesive-zone model for the interfaces, requiring cohesive laws for...

Local Excitation of Ferromagnetic Resonance and Its Spatially Resolved Detection With an Open-Ended Radio-Frequency Probe

February 10, 2010

Author(s)

Pavel Kabos

A local excitation of ferromagnetic resonance (FMR) and its detection were performed by using an open-ended radio frequency (RF) probe. THe RF probe is composed...

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