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Displaying 2201 - 2225 of 2934

Structure-Dependent Vibrational Dynamics in Mg(BH 4 ) 2 Polymorphs Probed with Neutron Vibrational Spectroscopy and First-Principles Calculations

August 19, 2016
Author(s)
Mirjana NMN Dimitrievska, James L. White, Wei Zhou, Vitalie Stavila, Leonard E. Klebanoff, Terrence J. Udovic
The structure-dependent vibrational properties of different Mg(BH 4)d2^ polymorphs (α, β, γ and δ phases) were investigated with a combination of neutron vibrational spectroscopy measurements and density functional theory (DFT) calculations, with emphasis

Supramolecular Hydrophobic Aggregates in Hydrogels Partially Inhibit Ice Formation

June 23, 2016
Author(s)
Clinton G. Wiener, Madhu Sudan Tyagi, Yun Liu, R. A. Weiss, Bryan D. Vogt
Prevention of ice crystallization is a challenging problem with implications in diverse applications, including the ability to examine the fundamental low temperature physics of water. Here, we demonstrate a simple route, inspired by water confinement in

Towards a dynamic pressure standard based on laser absorption spectroscopy

May 20, 2016
Author(s)
Kevin O. Douglass, Douglas A. Olson
We describe an approach for creating a cost-effective, field deployable dynamic pressure standard based on measurement of fundamental quantum properties of molecular systems. From the linewidth and intensities of ro-vibrational transitions we plan on

NIST Big Data Interoperability Framework: Volume 3, Use Cases and General Requirements

October 22, 2015
Author(s)
Wo L. Chang, Geoffrey Fox, NBD-PWG NIST Big Data Public Working Group
Big Data is a term used to describe the large amount of data in the networked, digitized, sensor-laden, information-driven world. While opportunities exist with Big Data, the data can overwhelm traditional technical approaches and the growth of data is

240 Hz linewidth Brillouin laser from a microrod whispering gallery mode resonator

September 29, 2015
Author(s)
William Loh, Aurelien C. Coillet, Frederick N. Baynes, Scott B. Papp, Scott A. Diddams, Joe Becker
We demonstrate an ultra-low noise laser that oscillates based on the stimulated Brillouin scattering nonlinearity in an optical microresonator. Our Brillouin laser employs a microrod resonator whose larger mode volume compared to conventional resonators

Ignition of Mulch beds exposed to firebrand showers

December 10, 2014
Author(s)
Samuel L. Manzello, Sayaka Suzuki
Mulch is commonly found near buildings and is a useful surrogate to study various fuels that may be present near buildings. To this end, mulch beds were exposed to continuous, wind-driven firebrand showers. These experiments build on our prior work where

Light Induced Gauge Fields for Ultracold Neutral Atoms

November 14, 2014
Author(s)
Ian B. Spielman
Ultracold neutral atoms, with their simple interactions along with well characterized, highly tunable system parameters, are an ideal platform for realizing and then quantitatively studying many-body phenomena. Many-body physics is perhaps most familiar in

Phase-Sensitive Detection of Spin Pumping via the ac Inverse Spin Hall Effect

October 6, 2014
Author(s)
Thomas J. Silva, Justin M. Shaw, Hans T. Nembach, Mathias A. Weiler
Sources of pure spin currents are a fundamental building block of spintronic devices. In ferromagnet/normal metal heterostructures, spin currents are generated at ferromagnetic resonance. This is known as spin pumping, where spin currents of both dc and ac

Quantum-noise-limited cavity ring-down spectroscopy

March 29, 2014
Author(s)
David A. Long, Adam J. Fleisher, Szymon S. Wojtewicz, Joseph T. Hodges
Spectroscopic techniques with ultra-high sensitivity allow for the study of a wide variety of physical and chemical phenomena, ranging from the interrogation of individual atoms1 and molecules2,3 to the quantitative extraction of ensemble properties from

Design of a Metal-Organic Framework with Enhanced Back Bonding for the Separation of N 2 and CH 4

January 15, 2014
Author(s)
Kyuho Lee, III Isley, Allison L. Dzubak, Pragya Verma, Samuel J. Stoneburner, Li-Chiang Lin, Joshua D. Howe, Eric D. Bloch, Douglas A. Reed, Matthew Ross Hudson, Craig Brown, Jeffrey R. Long, Jeffrey Neaton, Berend Smit, Christopher J. Cramer, Donald G. Truhlar, Laura Gagliardi
Gas separations with porous materials are economically important and provide a unique challenge to fundamental materials design, as adsorbent properties can be altered to achieve selective gas adsorption. Metal-organic frameworks represent a rapidly

Identification and Quantification of DNA Repair Protein Apurinic/Apyrimidinic Endonuclease 1 (APE1) in Human Cells by Liquid Chromatography/Isotope-Dilution Tandem Mass Spectrometry

July 29, 2013
Author(s)
Guldal Kirkali, Pawel Jaruga, Prasad T. Reddy, Alessandro Tona, Li Mengxia, David M. Wison III, M Miral Dizdar, Bryant C. Nelson
Unless repaired, DNA damage can drive mutagenesis or cell death. DNA repair proteins may therefore be used as biomarkers in disease detection or therapeutic response estimation. Thus, the accurate measurement of DNA repair protein expression is of

Development of Standard Reference Materials for Cement-Based Materials

May 13, 2013
Author(s)
Chiara F. Ferraris, Nicos Martys, William L. George
Rheometers are used to determine the rheological properties of materials ranging from mayonnaise to concrete. While rotational rheometers are routinely used for homogeneous materials such as mayonnaise, their usage for characterization of a granular fluid

Controlling the Competition between Optically Induced Ultrafast Spin-Flip Scattering and Spin Transport in Magnetic Multilayers

May 7, 2013
Author(s)
Justin Shaw, Hans Nembach, Thomas J. Silva, Margaret M. Murnane, Henry C. Kapteyn, Martin Aeschlimann, Claus M. Schneider, Emrah Turgut, Stefan Mathias, Patrik Grychtol, Chan La-O-Vorakiat, Dennis Rudolf, Roman Adam
The study of ultrafast dynamics in magnetic materials provides rich opportunities for greater fundamental understanding of correlated phenomena in solid-state matter, because many of the basic microscopic mechanisms involved are as-yet unclear and are

Review on Sustainability Characterization for Manufacturing Processes

February 15, 2013
Author(s)
Mahesh Mani, Jatinder Madan, Jae H. Lee, Kevin W. Lyons, Satyandra K. Gupta
Manufacturing industries lack the measurement science and the needed information base to measure and effectively compare environmental performances of manufacturing processes, resources and associated services with respect to sustainability. The current

Web-enabled Real-time Quality Feedback for Factory Systems using MTConnect

August 15, 2012
Author(s)
John L. Michaloski, Byeong Eon Lee, Frederick M. Proctor, Sid Venkatesh
Quality is a key element to success for any manufacturer, and the fundamental prerequisite for quality is measurement. In the discrete parts industry, quality is attained through inspection of parts but typically there is a long latency between machining

How nanorough is rough enough?

June 21, 2012
Author(s)
Konrad Rykaczewski, William A. Osborn, Jeff Chinn, Marlon L. Walker, John H. Scott, Wanda Jones, Chonglei Hao, Shuhuai Yao, Zuankai Wang
Surfaces which evince superhydrophobic properties during water condensation have a potential to dramatically enhance energy efficiency in power generation and desalination systems. Although various such surfaces have been reported, their development has

Noise floor reduction of an Er:fiber laser-based photonic microwave generator

December 1, 2011
Author(s)
Haifeng (. Jiang, Jennifer A. Taylor, Franklyn J. Quinlan, Tara M. Fortier, Scott A. Diddams
Commercially available erbium-doped mode-locked fiber lasers are compact, robust, and suitable to be the frequency divider of an ultra-low phase noise photonic microwave generator. However, for a mode-locked fiber laser with repetition rate of a few

A Highly Practical Route for Large-Area, Single Layer Graphene from Liquid Carbon Sources such as Benzene and Methanol

October 28, 2011
Author(s)
Gadipelli Srinivas, Irene G. Calizo, Jamie Ford, Guangjun Cheng, Angela R. Hight Walker, Taner N. Yildirim
Through a detailed systematic study, we determined the parameters critical for high-quality, single-layer graphene formation and developed a straightforward synthesis that requires no explosive hydrogen or methane gas flow. The synthesis is further

Guide for Security-Focused Configuration Management of Information Systems

August 12, 2011
Author(s)
L A. Johnson, Kelley L. Dempsey, Ronald S. Ross, Sarbari Gupta, Dennis Bailey
The purpose of Special Publication 800-128, Guide for Security-Focused Configuration Management of Information Systems, is to provide guidelines for organizations responsible for managing and administering the security of federal information systems and
Displaying 2201 - 2225 of 2934
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