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Displaying 24026 - 24050 of 73726

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

Detecting Paired and Counterflow superfluidity via dipole oscillations

October 27, 2011
Author(s)
Anzi A. Hu, Ludwig G. Mathey, Eite Tiesinga, Ippei Danshita, Carl J. Williams, Charles W. Clark
We suggest an experimentally feasible procedure to observe paired and counterflow superfluidity in ultra-cold atom systems. We study the time evolution of one-dimensional mixtures of bosonic atoms in an optical lattice following an abrupt displacement of

Method for Determining the Absolute Number Concentration of Nanoparticles from Electrospray

October 27, 2011
Author(s)
Mingdong M. Li, Suvajyoti S. Guha, Rebecca A. Zangmeister, Michael J. Tarlov, Michael R. Zachariah
We have developed a simple, fast, and accurate method to measure the absolute number concentration of nanoparticles in solution. The method combines electrospray-differential mobility analysis (ES-DMA) with a statistical analysis of droplet induced

On-Chip Security Using Electromagnetic Analysis

October 27, 2011
Author(s)
James Schaffner, Dylan Williams
In this report we describe a test bed designed to assess the vulnerabilities of security microcontrollers to electromagnetic monitoring, and use the test bed to show that it is indeed possible to gather more local information from electromagnetic

Report on the Third Static Analysis Tool Exposition (SATE 2010)

October 27, 2011
Author(s)
Vadim Okun, Paul E. Black, Aurelien M. Delaitre
The NIST Software Assurance Metrics And Tool Evaluation (SAMATE) project conducted the third Static Analysis Tool Exposition (SATE) in 2010 to advance research in static analysis tools that find security defects in source code. The main goals of SATE were

Synthesis and characterization of antimicrobial dimethacrylates containing quaternary ammonium functionalities for dental and biomedical applications

October 27, 2011
Author(s)
Joseph M. Antonucci, Diana N. Zeiger, Sheng Lin-Gibson, Bruce O. Fowler, Nancy J. Lin
The widespread incidence of recurrent caries has resulted in the need for improved dental restorative materials, including effective antibacterial, polymeric dental materials. Compounds with quaternary ammonium groups are known to reduce bacterial growth

Nanoscale Focused Ion Beam from Laser-cooled Lithium Atoms

October 26, 2011
Author(s)
Brenton J. Knuffman, Adam V. Steele, Jon Orloff, Jabez J. McClelland
To advance the capabilities of focused ion beam (FIB) technology, we have created a low-energy FIB from photoionized lithium atoms collected in a magneto-optical trap (MOT). This magneto-optical trap ion source relies on both the low temperature of the

Adjustable Zero Thermal Expansion in Antiperovskite Manganese Nitride

October 25, 2011
Author(s)
Xiaoyan Song, Zhonghua Sun, Qingzhen Huang, Markus Rettenmayr, Xuemei Liu, Martin Seyring, Guannan Li, Guanghui Rao, Fuxing Yin
The zero thermal expansion (ZTE) behavior particularly with a wide operating temperature range in a single material is extremely uncommon. With the clear experimental evidence we report a universal mechanism that controls the ZTE behavior of the
Displaying 24026 - 24050 of 73726
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