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Displaying 33851 - 33875 of 73832

Effective Link Triggers to Improve Handover Performance

September 11, 2006
Author(s)
Steve Woon, Nada T. Golmie, Y. A. Sekercioglu
Effective link layer triggering is key in order to enable fast and reliable handover across different access networks. In this paper, we investigate the use of signal strength as part of the trigger mechanism. We propose an analytical model to estimate the

Numerical Modeling of Diffusion-Induced Deformation

September 11, 2006
Author(s)
J A. Dantzig, William J. Boettinger, James A. Warren, Geoffrey B. McFadden, Sam R. Coriell, R F. Sekerka
We present a numerical approach to modeling the deformation induced the the Kirkendall effect in binary alloys. The governing equations for isothermal binary diffusion are formulated with respect to inert markers and also with respect to the volume

Whisker Formation in Pb-Free Surface Finishes

September 11, 2006
Author(s)
Gery R. Stafford, Maureen E. Williams, C E. Johnson, Kil-Won Moon, Ugo Bertocci, William J. Boettinger
High purity bright Sn, Sn-Cu and Sn-Pb layers measuring 3,7 and 16 microns thick were electrodeposited onto phosphor bronze cantilever beams in a rotating disk apparatus. Beam deflection measurements within 15 min. of plating proved that all

Determination of Lipid Phase Transition Temperatures in Hybrid Bilayer Membranes

September 9, 2006
Author(s)
Neil A. Anderson, Lee J. Richter, John C. Stephenson, Kimberly A. Briggman
The main gel to liquid crystal (LC) phase transition temperature, Tm, of the lipid monolayers in hybrid bilayer membranes (HBMs) was investigated using vibrational sum frequency spectroscopy (VSFS). The unique sensitivity of VSFS to probe order/disorder

Microwave Spectrum and Structure of Furfural

September 8, 2006
Author(s)
R A. Motiyenkoa, E A. Alekseev, S F. Dyubkoa, Francis J. Lovas
The microwave spectrum of furfural was investigated in the frequency range 7 GHz to 21 GHz and 49 GHz to 330 GHz. The ground and first torsional state of trans-furfural and ground state of cis-furfural were assigned and analyzed. A total of 1720 rotational

Elimination of two level fluctuators in superconducting quantum bits by an epitaxial tunnel barrier

September 7, 2006
Author(s)
Seongshik Oh, Katarina Cicak, Jeffrey S. Kline, Mika Sillanpaa, Jed D. Whittaker, Raymond W. Simmonds, David P. Pappas, Kevin Osborn
Quantum computing based on Josephson junction technology is considered promising due to its scalable architecture. However, decoherence is a major obstacle. Here, we report evidence for improved Josephson quantum bits qubits using a single-crystal Al2O3

An Upper Bound to the Frequency Dependence of the Cryogenic Vacuum-Gap Capacitor

September 6, 2006
Author(s)
Neil M. Zimmerman, Brian Simonds, Yicheng Wang
In attempting to develop a capacitance standard based on the charge of the electron, one question which has been open for many years is the frequency dependence of the vacuum-gap cryogenic capacitor. In this paper, we succeed in putting an upper bound on

Determination of SPRT Realization Uncertainties Between Points

September 6, 2006
Author(s)
Christopher W. Meyer, Dean C. Ripple
Calibrated Standard Platinum Resistance Thermometers (SPRTs) are used to realize the International Temperature Scale of 1990 (ITS-90) from 13.8033 K to 1234.93 K. The SPRTs are calibrated at a series of fixed points, each assigned a temperature on the ITS

Mechanical Properties of Nanocomposite Latex Films via Instrumented Indentation

September 6, 2006
Author(s)
Aaron M. Forster, Stephanie S. Watson, Laura Johnson, Li Piin Sung
Inorganic particles, introduced into networked or glassy polymer films, have been used to increase the stiffness of films as a function of pigment loading. Latex films often contain inorganic pigments to increase the opaqueness of the film and to act as UV

Self-Assembled Monolayers: Effect of Chain Length on Nanofriction

September 6, 2006
Author(s)
S Hsieh, S Sambasivan, J V. Sengers, Stephen M. Hsu
We measured the interfacial friction of a series of alkylsilanes with chain lengths from C5 to C30 on silicon (100) surfaces using an Atomic Force Microscope (AFM). The dependence of the friction on chain length exhibits an optimum curvature with C12

Unstructured Facility Navigation by Applying the NIST 4D/RCS Architecture

September 5, 2006
Author(s)
Roger V. Bostelman, Tsai Hong Hong, Tommy Chang, William P. Shackleford, Michael O. Shneier
The National Institute of Standards and Technology s (NIST) Intelligent Systems Division (ISD) is working with the material handling industry, specifically on automated guided vehicles, to develop next generation vehicles. ISD is also a participant in the

Measurement of Materials Dielectric Properties

September 4, 2006
Author(s)
Jan Obrzut
Dielectric materials are the building blocks of functional electronic circuits, capacitors, gate dielectrics, transmission lines, and are essential as electrical insulators for power distribution. Molecular solids, organic polymer resins, ceramic glasses

Shielding And Attenuation Properties of Large Buildings and Structures

September 4, 2006
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Kate Remley, S. A. Schima, Dylan Williams
For various applications, there is a growing need to understand the shielding and/or attenuation properties of large buildings and structures. In this paper, we present experimental data for the coupling of electromagnetic fields into various types of

Spectroscopic phase-dispersion optical coherence tomography measurements of scattering phantoms

September 4, 2006
Author(s)
Shellee D. Dyer, Tasshi Dennis, Lara Roberson, Shelley M. Etzel, Thomas Germer, Andrew Dienstfrey
We demonstrate a novel technique to determine the size of Mie scatterers with high sensitivity. Our technique is based on spectral domain optical coherence tomography measurements of the phase dispersion that is induced by the scattering process. We use

A C-S-H Atomic-Scale Computational Toolkit: Application to Service Life Modeling

September 1, 2006
Author(s)
Kenneth A. Snyder, Raymond D. Mountain, Antonio Faraone
A computational toolkit is being developed for studying materials relevant to portland cement hydration. The toolkit will eventually include both a materials database and a collection of computational tools for constructing atomic-scale models, of both

A Study on Search Engine Use by Intelligence Analysts

September 1, 2006
Author(s)
Don E. Libes, Emile L. Morse, Jean C. Scholtz
This work reports on search engine use by intelligence analysts, generally considered experts at the task of searching for information. Intelligence analysts share a degree of common training and understanding while having widely differing backgrounds

Absorbed Dose to Water Calibration of Ionization Chambers in a 60 Co Gamma-Ray Beam

September 1, 2006
Author(s)
Ronaldo Minniti, J Shobe, Stephen M. Seltzer, Huaiyu H. Chen-Mayer, S R. Domen
Absorbed-dose-to-water calibrations are important to the medical community to facilitate the accurate determination of doses delivered to tumors during external-beam cancer therapy. The first version of this document offered an absorbed-dose-to-water
Displaying 33851 - 33875 of 73832
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