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Displaying 28726 - 28750 of 73830

Examination of thin film modulus for a series of poly(alkyl methacrylates)

March 22, 2009
Author(s)
Jessica M. Torres, Christopher Stafford, Bryan D. Vogt
In this work, the modulus of polymer thin films for a homologous series of poly(n-alkyl methacrylate)s will be discussed. In particular, the impact of the degree of undercooling from bulk Tg on the deviations will be explored as Tg is significantly

Surviving Insecure IT: Effective Patch Management

March 21, 2009
Author(s)
Simon Liu, D. Richard Kuhn, Hart Rossman
The amount of time to protect enterprise systems against potential vulnerability continues to shrink. Enterprises need an effective patch management mechanism to survive the insecure IT environment. Effective patch management is a systematic and repeatable

Uncertainties in Scaling Factors for ab Initio Vibrational Zero-Point Energies

March 21, 2009
Author(s)
Karl K. Irikura, Russell D. Johnson III, Raghu N. Kacker, Ruediger Kessel
Vibrational zero-point energies (ZPEs) determined from ab initio calculations are often scaled by empirical factors. An empirical scaling factor partially compensates for the effects arising from vibrational anharmonicity and incomplete treatment of

A History of Fire Testing and New Opportunities Past, Present, and Future

March 20, 2009
Author(s)
James R. Lawson
This paper discusses the breakthroughs in science and engineering that have brought fire testing technology to its current state of maturity and provides insight into the possibilities for future fire test development by highlighting some areas where

A History of Fire Testing.

March 20, 2009
Author(s)
James R. Lawson
This paper discusses the breakthroughs in science and engineering that have brought fire testing technology to its current state of maturity and provides insight into the possibilities for future fire test development by highlighting some areas where

A transmitter for calibrating the extinction ratio of optical receivers

March 20, 2009
Author(s)
Jeffrey A. Jargon, Xiaoxia Wu, Paul D. Hale, Klaus M. Engenhardt, Alan Willner
We describe a transmitter being developed at the National Institute of Standards and Technology for calibrating extinction ratio measurements of optical receivers. Preliminary measurement results are presented, and major uncertainty components are

Exposure of Epitaxial Graphene on SiC(0001) to Atomic Hydrogen

March 20, 2009
Author(s)
N Guisinger, Gregory M. Rutter, Jason Crain, Phillip N. First, Joseph A. Stroscio
The realization of graphene-based electronics involves numerous challenges that include large-scale device fabrication and the ability to control the electronic properties of the graphene material1. As a nearly ideal 2D conductor, the electronic properties

Primary Standards and Dosimetry Protocols for Brachytherapy Sources

March 20, 2009
Author(s)
Christopher G. Soares, G. Douyssey, Michael G. Mitch
Current primary standards for the calibration of both photon and beta particle emitting brachythrapy sources are reviewed. Methods for quality control being used as well as methods of transferring these standards to secondary laboratories and user are also

Report on Acceleration Comparison SIM.AUV.V-K1 - Draft B

March 20, 2009
Author(s)
David J. Evans, Adriana Hornikova, Stefan D. Leigh, Andrew L. Rukhin, William E. Strawderman
The first regional key comparison in vibration conducted under the auspices of the Inter-American System of Metrology (SIM) was begun in 1996. The comparison was registered with the International Bureau of Weights and Measures (BIPM) through the

Thermodynamic and Thermophysical Properties ( Including Mixtures) of the Reference Ionic Liquid: 1-Hexyl-3-Methylimidazolium Bis[(Trifluoromethyl) Sulfonyl]amide. Part 2. Critical Evaluation and Recommended Property Values

March 20, 2009
Author(s)
Robert D. Chirico, Vladimir Diky, Joe W. Magee, Michael D. Frenkel, Kenneth N. Marsh
This article is a product of IUPAC Project 2002-005-1-100 (Thermodynamics of ionic liquids, ionic liquid mixtures, and the development of standardiized systems). Experimental results of thermodynamic, transport, and phase equilibrium studies made on a

Thermodynamic and Thermophysical Properties of the Reference Ionic Liquid: 1-Hexyl-3-Methylimidazolium Bis[(Trifluoromethyl)Sulfonyl]amide (including mixtures). Part 1. Experimental Methods and Results

March 20, 2009
Author(s)
Kenneth N. Marsh, Joan F. Brennecke, Robert D. Chirico, Michael D. Frenkel, Andreas Heintz, Joe W. Magee, Cor J. Peters, Luis P. Rebelo, Kenneth R. Seddon
This article summarized the results of IUPAC Project 2002-005-1-100 (Thermodynamics of ionic liquids, ionic liquid mixtures, and the development of standardized systems). The methods used by the various contributors to measure the thermophysical and phase

Word-synchronous linear optical sampling of 40 Gb/s QPSK signals

March 20, 2009
Author(s)
Tasshi Dennis, Paul A. Williams, Ian R. Coddington, Nathan R. Newbury
We demonstrate word-synchronous measurements of QPSK format 40 Gb/s PRBS signals using linear optical sampling with a precision time-base, which allows us to average waveforms and distinguish between signal distortion and noise in eye diagrams.

Quantifying Residual Stress in Nanoscale Thin Polymer Films via Surface Wrinkling

March 19, 2009
Author(s)
Jun Y. Chung, Thomas Q. Chastek, Michael J. Fasolka, Hyun W. Ro, Christopher Stafford
Residual stress, a pervasive consequence of solid materials processing, is stress that remains in a material after external forces have been removed. In polymeric materials, residual stress results from processes, such as film formation, that force and

Development of a Powered Outdoor Sealant Fatigue Test Apparatus

March 18, 2009
Author(s)
Christopher C. White, R. S. Williams, Steve Lacher, Corey C. Halpin
A new cyclic fatigue test apparatus (CFTA) was developed at the USDA Forest Service, Forest Products Laboratory. The new CFTA is computer-controlled and powered by electric linear actuators. Computer control allows the CFTA to subject specimens to specific

Restrictions on Transversal Encoded Quantum Gate Sets

March 18, 2009
Author(s)
Bryan K. Eastin, Emanuel H. Knill
Transversal gates play an important role in the theory of fault-tolerant quantum computation due to their simplicity and robustness to noise. By definition, transversal operators do not couple physical subsystems within the same code block. Consequently

Transparency and conductivity of carbon nanotube networks

March 18, 2009
Author(s)
Jan Obrzut
The conductivity of films made of nanotubes longer than 200 nm closely follows the percolation theory for two-dimensional (2D) networks. The scaling universal exponents describing the percolation transition from an insulating to conducting state with
Displaying 28726 - 28750 of 73830
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