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Search Publications

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Displaying 11701 - 11725 of 73697

What Causes the Anomalous Aggregation in Pluronic Aqueous Solutions?

May 28, 2018
Author(s)
Kuo-Chih Shih, Zhiqiang Shen, Ying Li, Martin Kroger, Shing-Yun Chang, Yun Liu, Mu-Ping Nieh, Hsi-Mei Lai
Pluronic (PL) block copolymers has been widely used as delivery carriers, molecular templates for porous media, process additive of affecting rheological behavior. Unlike most surfactant systems, where unimer transforms into micelle with increased

Materials and Processes for CO2 Capture, Conversion and Sequestration

May 26, 2018
Author(s)
Winnie K. Wong-Ng, Lan Li, Lawrence P. Cook, Kevin Huang
The book “Materials and Processes for CO2 Capture, Conversion and Sequestration (CCS)” which will be published by John Wiley & Sons, Inc., is a result of the symposium of the same title which took place in 2014 during the MS&T (Materials Science and

Metrology for stable isotope reference materials: 13C/12C and 18O/16O isotope ratio value assignment of pure carbon dioxide gas samples on the Vienna PeeDee Belmnite-CO2 scale using dual-inlet mass spectrometry

May 25, 2018
Author(s)
Abneesh Srivastava, R M. Verkouteren
Isotope ratio measurements have been conducted on a series of isotopically distinct pure CO2 gas samples using the technique of dual-inlet isotope ratio mass spectrometry (DI-IRMS). The influence of instrumental parameters, data normalization schemes on

Performance Testing of Hydraulic Cements: Measuring Sulfate Resistance

May 25, 2018
Author(s)
Chiara F. Ferraris, Paul E. Stutzman, Max A. Peltz
The sulfate resistance of cements used in the construction industry is traditionally assessed by measuring the expansion of a prism of 280 mm (11inch) length and 25 mm (1 inch) square cross section immersed in a sodium sulfate solution for at least one

Standardization of 64Cu activity

May 25, 2018
Author(s)
Denis E. Bergeron, Jeffrey T. Cessna, Ryan P. Fitzgerald, Leticia S. Pibida, Brian E. Zimmerman
The complex decay scheme that makes 64Cu promising as both an imaging and therapeutic agent in medicine also makes the absolute measurement of its activity challenging. The National Institute of Standards and Technology (NIST) has completed a primary

A Dynamic Rate Adaptation Scheme for M2M Communications

May 24, 2018
Author(s)
Yalong Wu, Wei Yu, David W. Griffith, Nada T. Golmie
The number of Machine-to-Machine (M2M) devices has continued to grow at an accelerated rate. Without thoughtful and efficient resource management, M2M communications will be asymmetrically handicapped by service rate scarcity as more devices are

A trapped human PPM1A-phosphopeptide complex reveals structural features critical for regulation of PPM protein phosphatase activity

May 24, 2018
Author(s)
Subrata Debnath, Dalibor Kosek, Harichandra Tagad, Stewart R. Durell, Daniel Appella, Roderico Acevedo, Alexander Grishaev, Fred Dyda, Ettore Appella, Sharlyn Mazur
Metal-dependent protein phosphatases (PPM) are evolutionarily unrelated to other serine/threonine protein phosphatases and are characterized by their requirement for supplementation with millimolar concentrations of Mg2+ or Mn2+ ions for activity in vitro

Modeling and Simulation Analysis of the Physical Sidelink Shared Channel (PSSCH)

May 24, 2018
Author(s)
David W. Griffith, Fernando J. Cintron, Timothy Hall, Richard A. Rouil
This paper examines the performance of the Long Term Evolution (LTE) Physical Sidelink Shared Channel (PSSCH) in out-of-coverage (OOC) device-to-device (D2D) communication scenarios. We develop a closed form expression for the distribution of the number of

Poroelastic Fracture Transition of a Biopolymer Gel

May 24, 2018
Author(s)
Edwin P. Chan, Bradley R. Frieberg, Ronald L. Jones, Ray-Shimry Garatsa, John Bachert, Benjamin Crawshaw
Controlling the fracture behavior of thermoreversible biopolymer gels is important in many con- sumer based applications. For example, gelatin gels are used in the encapsulation and release in vitamin capsules, the manipulation of texture in gelled foods

Ventilation, IAQ and Filtration in a Net Zero Energy House

May 24, 2018
Author(s)
Andrew K. Persily, Lisa C. Ng, Dustin G. Poppendieck, Steven J. Emmerich
The Net Zero Energy Residential Test Facility (NZERTF) was constructed at the National Institute of Standards and Technology (NIST) to support the development and adoption of cost-effective net zero energy designs and technologies. The 250 m2 two-story

Absence of diffuse double layer effect on the vibrational properties and oxidation of chemisorbed carbon monoxide on a Pt(111) electrode

May 23, 2018
Author(s)
Marta C. Figueiredo, Dennis Hiltrop, Ravishankar Sundararaman, Kathleen Schwarz, Marc Koper
In this work we investigate the effects of the diffuse double layer thickness on the electrochemical Stark tuning and oxidation of carbon monoxide at Pt(111) surfaces in perchloric acid solution. The diffuse double layer thickness was modified by changing

Generalized auto-balanced Ramsey spectroscopy of clock transitions

May 23, 2018
Author(s)
V. I. Yudin, A. V. Taichenachev, M. Y. Basalaev, T. Zanon-Willette, Juniper Wren Y. Pollock, Moshe Shuker, Elizabeth Donley, John Kitching
We develop the theory for generalised auto-balanced Ramsey spectroscopy (GABRS), which allows probe-field-induced shifts in atomic clocks to be eliminated. This universal two-loop method, apart from the clock frequency omega, requires the use of an

Protecting Software Integrity Through Code Signing

May 23, 2018
Author(s)
David A. Cooper, Leonard Feldman, Gregory A. Witte
This bulletin summarizes the information found in the white paper Security Considerations for Code Signing, which describes features and architectural relationships of typical code signing solutions that are widely deployed today. The paper also defines

Mobile Application Security Exercise (MASE): Final Report

May 22, 2018
Author(s)
Michael A. Ogata
Mobile applications have become an integral part in the mission of the federal government and public safety. There exist many techniques that seek to assure these applications are free from software bugs and vulnerabilities. However, a unified list of

Revision of the ionization energy of neutral carbon

May 22, 2018
Author(s)
W L. Glab, Haris Kunari, Alexander Kramida
This publication describes a re-analysis of previously published data on neutral carbon (C I) utilizing critically examined and improved values for the line energies of the absorption spectrum of molecular iodine to calibrate the transition energies of C I

Structure and Dynamics of a Graphene Melt

May 22, 2018
Author(s)
Jack F. Douglas, Sinan Keten, Fernando Vargas-Lara, Wenjie Xia
We show by molecular dynamics simulation that bulk materials composed of graphene nanosheets exhibit fluid-like properties similar to linear polymer melts at elevated temperatures and that these materials transform into a glassy or “foam” state at low

A portable cold 87Rb atomic clock with frequency instability at one day in the 10 -15 range

May 21, 2018
Author(s)
Joshua J. Savory, F G. Ascarrunz, L I. Ascarrunz, Alessandro L. Banducci, M C. Delgado Aramburo, Y Dudin, Steven R. Jefferts
We present a small portable cold 87Rubidium atomic clock with frequency uncertainty of less than 𝟑 × 𝟏𝟎 −𝟏𝟓 in one day of averaging time. The clock is under development at SpectraDynamics for the Defense Advanced Research Projects Agency (DARPA) Portable
Displaying 11701 - 11725 of 73697
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