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Search Publications

NIST Authors in Bold

Displaying 20001 - 20025 of 73751

Visualizing Nanoparticle Dissolution by Imaging Mass Spectrometry

March 10, 2014
Author(s)
Christopher W. Szakal, Melissa S. Ugelow, Justin M. Gorham, Andrew R. Konicek, Richard D. Holbrook
We demonstrate the ability to visualize nanoparticle dissolution while simultaneously providing chemical signatures that differentiate between citrate-capped silver nanoparticles (AgNPs), AgNPs forced into dissolution via exposure to UV radiation, silver

Attribute Based Access Control (ABAC) Definition and Considerations

March 7, 2014
Author(s)
Chung Tong Hu
Attribute-Based Access Control (ABAC) is a logical access control methodology where authorization to perform a set of operations is determined by evaluating attributes associated with the subject, object, requested operations, and, in some cases

Analytical Capabilities of Chemiresistive Microsensor Arrays in a Simulated Martian Atmosphere

March 6, 2014
Author(s)
Kurt D. Benkstein, Phillip H. Rogers, Christopher B. Montgomery, Jerry Jin, Baranidharan Raman, Stephen Semancik
The capabilities of a chemiresistive microsensor array for detecting and identifying four trace target analytes were examined under a simulated Martian atmosphere. The simulated environment included low oxygen content (0.15 %) balanced by carbon dioxide

Fire Model Validation Eight Lessons Learned

March 6, 2014
Author(s)
Kevin B. McGrattan, Richard D. Peacock, Kristopher J. Overholt
This paper provides a summary of a decade-long effort to verify and validate a variety of different fire models used in the commercial nuclear industry. The lessons learned apply to any industry in which fire models are used in a regulatory context. The

Controlled Formation and Characterization of Dithiothreitol-Conjugated Gold Nanoparticle Clusters

March 5, 2014
Author(s)
De-Hao D. Tsai, Tae Joon Cho, Frank W. DelRio, Justin Gorham, Jiwen Zheng, Jiaojie Tan, Michael R. Zachariah, Vincent A. Hackley
We report a systematic study of the controlled formation of discrete-size gold nanoparticle clusters (GNCs) by interaction with the reducing agent dithiothreitol (DTT). Asymmetric-flow field flow fractionation and electrospray differential mobility

Design Considerations for Enhancing Absorption in Semiconductors on Metals with Surface Plasmon Polaritons

March 5, 2014
Author(s)
Christopher C. Bohn, Amit K. Agrawal, Youngmin Lee, Charles J. Choi, Matthew Davis, Paul M. Haney, Henri J. Lezec, Veronika A. Szalai
Surface plasmon polaritons have attracted attention for energy applications such as photovoltaic and photoelectrochemical cells because of their ability to improve optical absorption in thin fi lms. We show that surface plasmon polaritons enhance

Dropwise Condensation of Low Surface Tension Fluids on Omniphobic Surfaces

March 5, 2014
Author(s)
John H. Scott, Konrad Rykaczewski, Adam T. Paxson, Matthew E. Staymates, Marlon L. Walker, Xiaoda Sun, Sushant Anand, Siddarth Srinivasan, Gareth H. McKinley, Jeff Chinn, Kripa Varanasi
Compared to the significant body of work devoted to surface engineering for promoting dropwise condensation heat transfer of steam, much less attention has been dedicated to fluids with lower interfacial tension. A vast array of low-surface tension fluids

Optical detection of radio waves through a nanomechanical transducer

March 5, 2014
Author(s)
Jacob M. Taylor, Tolga Bagci, A Simonsen, Silvan Schmid, L Villanueva, Emil Zeuthen, Anders Sorensen, Koji Usami, A Schliesser, E.S. Polzik
Low-loss transmission and sensitive recovery of weak radio-frequency (rf) and mi- crowave signals is an ubiquitous technological challenge, crucial in fields as diverse as radio astronomy, medical imaging, navigation and communication, including those of

Three-deminstional Hemisphere-structured LiSn_(0.0125)Mn_(1.975)O_(4) Thin-Film Cathodes

March 5, 2014
Author(s)
Haena Yim, Woo Yeon Kong, Seok-JIn Yoon, Sahn Nahm, Ho Won Jang, Yung-Eun Sung, Jong Y. Ha, Albert Davydov, Ji-Won Choi
Three-dimensional (3D) high surface area LiSn_(0.0125)Mn_(1.975)O-(4) thin film cathodes have been fabricated in order to increase a charge/discharge capacity in the Li-ion battery. Metal oxide films were deposited by RF magnetron sputtering on close

Use of High-Strength Reinforcement in Earthquake-Resistant Concrete Structures

March 5, 2014
Author(s)
Domimic Kelly, Andres Lepage, David Mar, Jose Restrepo, Joseph Sanders, Andrew Taylor
The objective of this project was to study and make recommendations concerning the utilization of high-strength steel reinforcing bars in concrete structures subjected to earthquake ground motion. This work grew out of the ATC-57 report, The Missing Piece

An Integrated Detection System Against False Data Injection Attacks in the Smart Grid

March 4, 2014
Author(s)
Wei Yu, David W. Griffith, Linqiang Ge, Sulabh Bhattarai, Nada T. Golmie
The smart grid is a new type of power grid that will use the advanced communication network technologies to support more efficient energy transmission and distribution. The grid infrastructure was designed for reliability; but security, especially against

Characterization of InGaN quantum disks in GaN nanowires

March 4, 2014
Author(s)
Alexana Roshko, Roy H. Geiss, John B. Schlager, Matthew D. Brubaker, Kristine A. Bertness, Norman A. Sanford, Todd E. Harvey
Catalyst-free GaN nanowires with InGaN quantum disks (QDs) were characterized by scanning/transmission elec-tron microscopy (S/TEM) and photoluminescence. A va-riety of structures, from QDs with large strain fields to apparently strain free QDs were

Metrology Needs for TSV Fabrication

March 4, 2014
Author(s)
Victor H. Vartanian, Richard A. Allen, Larry Smith, Klaus Hummler, Steve Olson, Brian Sapp
This paper focuses on the metrology needs and challenges of through silicon via (TSV) fabrication, consisting of TSV etch, liner, barrier, and seed (L/B/S) depositions, copper plating, and copper CMP. These TSVs, with typical dimensions within a factor of

Building Better Search Engines by Measuring Search Quality

March 3, 2014
Author(s)
Ellen M. Voorhees, Paul D. Over, Ian Soboroff
Search engines help users locate particular information within large stores of content developed for human consumption. For example, users expect web search engines to direct searchers to web sites based on the content of the site rather than the site

Constant Shape Factor Frequency Modulated Charge Pumping (FMCP)

March 3, 2014
Author(s)
Jason T. Ryan, Jason P. Campbell, Jibin Zou, Kin P. Cheung, Richard Southwick, Anthony Oates, Rue Huang
Abstract— We examine the seemingly frequency-dependent gate leakage current component of frequency-modulated charge pumping and show it to be a measurement artifact. If untreated, this results in erroneous defect density extractions. We present a constant

Dependence of the Filament Resistance on the Duration of Current Overshoot

March 3, 2014
Author(s)
Pragya R. Shrestha, David M. Nminibapiel, Jason P. Campbell, Kin P. Cheung, Helmut Baumgart, Shweta Deora, G. Bersuker
The characteristics of a conductive filament in HfO2 RRAM is shown to be dependent on the duration of the current compliance overshoot, which may occur during the filament formation process. In addition to the overshoot amplitude, the filament resistance

Fast-Capacitance for Advanced Device Characterization

March 3, 2014
Author(s)
Pragya R. Shrestha, Kin P. Cheung, Jason T. Ryan, Jason P. Campbell, Helmut Baumgart
Fast-CV measurements are frequently being used to study transient phenomena associated with advanced devices. In this study, we show that many artifacts plague this measurement and then provide a proper method to legitimize fast-CV measurements as
Displaying 20001 - 20025 of 73751
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