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Displaying 24201 - 24225 of 73929

Mobile-App Addiction: Threat to Security?

November 1, 2011
Author(s)
George Hurlburt, Jeff Voas, Keith Miller
Giving individuals this kind of information processing power, along with unprecedented connectivity, might be the single most impressive technical achievement of the 21st century. Nobody knows what the full impact of this transformation will be, but it's

Modeling Produces Insight into Fire Behavior

November 1, 2011
Author(s)
Adam M. Barowy, Daniel M. Madrzykowski
The National Institute of Standards and Technology (NIST) is the leader in the development of computer-based fire models that simulate the movement of fire gases and heat through a building and estimate the response of various fire protection systems. NIST

Moments of the Truncated Complex Gaussian Distribution

November 1, 2011
Author(s)
Ryan J. Pirkl
We present arbitrary moments of the univariate and bivariate truncated complex Gaussian distribution. Using these moment expressions, we investigate the convergence of a particular infinite series of moments encountered in recent statistical analyses of

Pinhole X -ray camera photos of an ECR ion source plasma

November 1, 2011
Author(s)
Lawrence T. Hudson, Sandor Biri, E Takacs, R. Racz, J. Palinkas
A 70 micrometer pinhole and an X-ray CCD camera in single photon counting mode were used to obtain spatially and spectral resolved images of an electron cyclotron resonance (ECR) ion source generated plasma. The method has good spatial resolution as well

The Latest and Greatest NIST PCR-based DNA Profiling Standard: Updates and Status of Candidate Standard Reference Material (SRM) 2391c

November 1, 2011
Author(s)
Margaret C. Kline, Carolyn R. Steffen, Jamie L. Almeida, Erica L. Romsos, Michael D. Coble, John M. Butler
Standard Reference Material 2391c (SRM 2391c) PCR-based DNA Profiling Standard is the third renewal of this SRM, originally released in 1995. SRM 2391c consists of 6 candidate components labeled A through F. Components A through D are supplied as genomic

Tips and tools for digitizing a museum collection

November 1, 2011
Author(s)
Regina L. Avila, Susan A. Sanders, Keith R. Martin
This article is a "how to guide" for directing and managing a museum photography project. It is based on what the NIST Research Library learned as we went through the process of gathering and photographing museum objects, organizing the digital images, and

Verification of Noise-Parameter Measurements and Uncertainties

November 1, 2011
Author(s)
James P. Randa, Dazhen Gu, Dave K. Walker
We propose and implement verification methods for measurements of noise parameters of amplifiers and transistors. Because the verification rests on the comparison of different measurement results, it also serves as a test of the uncertainties. The

500 GHz - 750 GHz Rectangular-Waveguide Vector-Network-Analyzer Calibrations

October 31, 2011
Author(s)
Dylan F. Williams
We develop an uncertainty analysis that captures the dominant sources of measurement error in state-of-the-art rectangular-waveguide vector-network-analyzer measurements over the frequency range 500 GHz – 750 GHz. We use the analysis to assess thru-reflect

Integrating jQuery with the 3D Descriptive Markup of X3DOM

October 31, 2011
Author(s)
Sanford P. Ressler
This paper describes a number of techniques using jQuery to take advantage of the 3D descriptive markup implemented by X3DOM. X3DOM is a project of the Web3D Consortium, primarily being implemented by staff at Fraunhoffer IGD to provide 3D descriptive

Modeling and Analysis of Disproportionate Collapse of RC Structures

October 31, 2011
Author(s)
Yihai Bao, Hai S. Lew, S K. Kunnath
Collapse analyses of a 10-story reinforced concrete frame building are carried out to investigate the robustness of structural systems against column removal scenarios. Computationally efficient reduced models are developed and used in the analyses. The

A 750 mW, continuous-wave, solid-state laser source at 313 nm for cooling and manipulating trapped 9Be+ ions

October 28, 2011
Author(s)
Andrew C. Wilson, Christian Ospelkaus, Aaron Vandevender, J. A. Mlynek, Kenton R. Brown, Dietrich G. Leibfried, David J. Wineland
We present a solid-state laser system that generates 750 mW of continuous-wave, single frequency, output at 313 nm. Sum-frequency generation with fiber lasers at 1550 nm and 1051 nm produces up to 2 W at 626 nm. This visible light is then converted to UV

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

Architectural Recommendations for Global Interoperability Test Bed

October 28, 2011
Author(s)
Nenad Ivezic
This paper offers a collection of recommendations to architect a comprehensive and coherent architectural solution for a global interoperability testing framework for eBusiness systems. Requirements from an initial set of three industrial use cases drove

Deformation and fracture of single-crystal silicon theta-like specimens

October 28, 2011
Author(s)
Michael S. Gaither, Frank W. DelRio, Richard S. Gates, Robert F. Cook
Miniaturized test specimens of single-crystal silicon, fabricated by lithography and deep reactive ion etching (DRIE), were used to measure deformation and fracture properties at the micro scale. Two specimen geometries, both in the form of a Greek letter

In Search of Enhanced Electrolyte Materials: A Case Study of Doubly Doped Ceria

October 28, 2011
Author(s)
Pratik Dholabhai, James B. Adams, Peter A. Crozier, Renu Sharma
Various compositions of gadolinium-praseodymium doubly doped ceria (GPDC) have been studied to appreciate the effect of two co-dopants in enhancing the ionic conductivity. A Kinetic Lattice Monte Carlo (KLMC) model of vacancy diffusion in GPDC has been

The neutron cross section standards, evaluations and applications

October 28, 2011
Author(s)
Allan D. Carlson
The measurement of a neutron cross section can be simplified if it is measured relative to a neutron cross section standard. Then it is not necessary to measure the neutron fluence. The standards in effect provide determinations of the neutron fluence

A Trustful Authentication and Key Exchange Scheme (TAKES) for Ad Hoc Networks

October 27, 2011
Author(s)
Tony V. Cheneau, Maryline Laurent, Andrei V. Sambra
This paper presents a new public key distribution scheme adapted to ad hoc networks called TAKES for Trustful Authentication and Key Exchange Scheme. Its originality lies in performing authentication and key distribution with no need for a trusted
Displaying 24201 - 24225 of 73929
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