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Conferences

Pulse Tube Cryocooler for Rapid Cooldown of A Superconducting Magnet

June 9, 2008

Author(s)

Michael A. Lewis, Ryan P. Taylor, Peter E. Bradley, Isaac Garaway, Ray Radebaugh

A single-stage pulse tube cryocooler was designed to provide rapid cooldown of a high temperature superconducting (HTS) magnet that is part of a gyrotron...

Precision Differential Sampling Measurements of Low-Frequency Voltages Synthesized with an AC Programmable Josephson Voltage Standard

June 9, 2008

Author(s)

Alain Rufenacht, Charles J. Burroughs, Samuel P. Benz, Paul D. Dresselhaus, Bryan C. Waltrip, Thomas L. Nelson

Sampling is a promising technique to compare the stepwise-approximated sine waves synthesized by an AC Programmable Josephson Voltage Standard to the sinusoidal...

Extraction of trench geometry and linewidth of nanoscale grating targets in (110)-oriented silicon using angle-resolved scatterometry

June 9, 2008

Author(s)

Heather J. Patrick, Thomas A. Germer, Michael W. Cresswell, Bin Li, Huai Huang, Paul S. Ho

The extraction of nanoscale dimensions and feature geometry of grating targets using signature-based optical techniques is an area of continued interest in...

Improvements in the NIST Johnson Noise Thermometry System

June 9, 2008

Author(s)

Samuel Benz, Horst Rogalla, Rod White, Jifeng Qu, Paul Dresselhaus, Wes L. Tew, Sae Woo Nam

We have developed a Johnson noise thermometry system that is calibrated by precision waveforms synthesized with a quantum-accurate voltage noise source (QVNS)...

Progress toward a 1V Pulse-Driven AC Josephson Voltage Standard

June 9, 2008

Author(s)

Samuel Benz, Paul Dresselhaus, Norman F. Bergren, Regis Landim

We present a new record output voltage of 275 mVrms, which is a 25% improvement over the maximum achieved with previous ac Josephson voltage standard circuits...

Complete waveform characterization at NIST

June 8, 2008

Author(s)

Paul D. Hale, Tracy S. Clement, Darryl A. Keenan, Dylan F. Williams, Arkadiusz C. Lewandowski, C. M. Wang, Andrew Dienstfrey

We present a method for calibrating the voltage a pulse generator delivers to a load at every point in the measured waveform epoch. The calibration includes an...

High resolution spectroscopy using fiber-laser frequency combs

June 8, 2008

Author(s)

Ian R. Coddington, William C. Swann, Nathan R. Newbury

The output of a femtosecond fiber laser can be both spectrally broadened and stabilized, thereby providing a broadband coherent source in the near infrared. In...

ANTENNA TEST RANGE IMAGING USING SPHERICAL NEAR-FIELD SCANNING

June 8, 2008

Author(s)

Michael H. Francis, Ronald C. Wittmann, Randy Direen

Although the theory is straightforward, practical implementation of spherical near-field scanning for evaluating test chambers presents some significant...

Design and Correction Factor Evaluation of a WR-15 (50 to 75 GHz) Microcalorimeter

June 8, 2008

Author(s)

Thomas P. Crowley, Xiaohai Cui

The design and evaluation of a WR-15 (50 to 75 GHz) rectangular waveguide microcalorimeter is presented. This new microcalorimeter will be the national standard...

Uncertainty Analysis for Noise-Parameter Measurements

June 8, 2008

Author(s)

James P. Randa

A brief summary is presented for the uncertainty analysis for measurements of noise parameters of amplifiers and transistors, in both connectorized (coaxial)...

High Rate Tensile Strength Measurements of Frangible Bullets Using a Kolsky Bar

June 8, 2008

Author(s)

Steven P. Mates, Richard L. Rhorer, Stephen W. Banovic, Eric P. Whitenton, Richard J. Fields

The tensile strength of frangible bullets is measured by a high rate diametral compression test (DCT) performed with a Kolsky Bar. Frangible bullets, meant to...

Effect of material properties on broadband electrical behavior of coplanar waveguides

June 8, 2008

Author(s)

Uwe Arz, Jens Leinhos, Michael D. Janezic

We investigate the importance of broadband substrate permittivity and loss tangent measurement for accurate calculations of the characteristic impedance and...

Bilateral optical fiber power meter linearity comparison between NMIJ and NIST

June 8, 2008

Author(s)

Seiji Mukai, Kuniaki Amemiya, Michiyuki Endo, Igor Vayshenker, Xiaoyu X. Li, Shao Yang

Optical fiber power meter (OFPM) linearity standards of NMIJ (Japan) and NIST (USA) are compared using a commercial OFPM as a transfer standard at 1310 nm and...

Noise-parameter measurement with automated variable terminations

June 8, 2008

Author(s)

Dazhen Gu, Dave K. Walker, James P. Randa

NIST has upgraded its measurement capability of noise parameters on low-noise amplifiers with a variable termination unit in the 1 to 12.4 GHz range. Such a...

Calibrated Broadband Electrical Characterization of Nanowires

June 8, 2008

Author(s)

Thomas Mitchell (Mitch) Wallis, Atif A. Imtiaz, Hans Nembach, Kristine A. Bertness, Norman Sanford, Paul T. Blanchard, Pavel Kabos

A technique is presented for the broadband electrical characterization of nanowires. The technique relies on established on-wafer calibration methods as well as...

Permittivity and Permeability and the Basis of Effective Parameters

June 8, 2008

Author(s)

James R. Baker-Jarvis, Michael D. Janezic, Billy F. Riddle

The concepts of effective permittivity and permeability are used throughout the literature to describe both highly heterogeneous materials, inhomogeneous...

Mixed Analog-Digital Instrumentation for Software-Defined-Radio Characterization

June 5, 2008

Author(s)

Catherine A. Remley, Nuno Carvalho, Pedro Cruz, Kevin Gard

This paper presents a new type of analog-digital mixed-domain instrument that is specially tailored for software defined radio characterization. The instrument...

Controlled Encapsulation of a Hydrophilic Drug Simulant in Nano-Liposomes Using Continuous Flow Microfluidics

June 4, 2008

Author(s)

Andreas Jahn, Joseph E. Reiner, Wyatt N. Vreeland, Don DeVoe, Laurie E. Locascio, Michael Gaitan

A new method to tailor the size and size distribution of nanometer scale liposomes and control loading of liposomes with a model drug in a continuous-flow...

Policy Specification and Enforcement for Smart ID Cards Deployment

June 3, 2008

Author(s)

Ramaswamy Chandramouli

Deployment of Smart Cards for Identity Verification requires collection of credentials and provisioning of credentials from and to heterogeneous and sometimes...

Radio Communications for Emergency Responders in High-Multipath Outdoor Environments

June 2, 2008

Author(s)

Catherine A. Remley, Galen H. Koepke, Christopher L. Holloway, Chriss A. Grosvenor, Dennis G. Camell

We present measurement data to support technology and standards development for broadband, digitally modulated radio communications used by emergency responders...

Lateral force cantilever for precise atomic force microscope friction measurements

June 2, 2008

Author(s)

Mark Reitsma, Richard S. Gates, Robert F. Cook

We present a microfabricated atomic force microscope (AFM) cantilever and associated calibration procedure that provide a path for quantitative friction...

Can TCP Metastability Explain Cascading Failures and Justify Flow Admission Control in the Internet?

June 2, 2008

Author(s)

Vladimir V. Marbukh

This paper discusses implications of possible metastability of TCP-type fair bandwidth sharing under random flow arrivals/departures for understanding and...

A New Microdevice for SI-Traceable Forces in Atomic Force Microscopy

June 2, 2008

Author(s)

Gregory W. Vogl, Jason J. Gorman, Gordon A. Shaw, Jon R. Pratt

A new self-excited micro-oscillator is proposed as a velocity standard for dissemination of nanoNewton-level forces that are traceable to the International...

Reducing Thermal Noise in Molecular Force Spectroscopy

June 2, 2008

Author(s)

Gordon A. Shaw

Molecular force spectroscopy is the practice of testing the mechanical properties of single molecules. The precision determination of these properties requires...

Fabry-Perot temperature dependence and surface-mounted optical cavities

June 2, 2008

Author(s)

Richard W. Fox

Factors that contribute to the resonance temperature dependence of low-expansion optical cavities are discussed, including deformation at the cavity ends due to...

Magneto-resistive Field Mapping of Analog Audio Tapes for Forensics Imaging

June 2, 2008

Author(s)

David P. Pappas

Magneto-resistive imaging of cassette tapes for forensic analysis applications is presented. Sample tapes were recorded on various tape recorders with events...

High-Voltage Isolated Gate Drive Circuit for 10 kV, 100 A SiC MOSFET/JBS Power Modules

June 2, 2008

Author(s)

David W. Berning, Tam H. Duong, Jose M. Ortiz, Angel Rivera, Allen R. Hefner Jr.

A high-current, high-voltage-isolated gate drive circuit developed for characterization of high-voltage, high-frequency 10 kV, 100 A SiC MOSFET/JBS half-bridge...

THE 2006 ADJUSTMENT OF THE FUNDAMENTAL CONSTANTS: LOOKING TOWARDS 2010

June 1, 2008

Author(s)

David B. Newell, Peter Mohr, B N. Taylor

A new set of values of the basic fundamental constants has been recommended by the Committee on Data for Science and Technology (CODATA) (http://physics.nist...

A New Oscillator for SI-Traceable Measurements in Atomic Force Microscopy

June 1, 2008

Author(s)

Gregory W. Vogl, Jason J. Gorman, Gordon A. Shaw, Jon R. Pratt

See attached.

HIGH RESISTANCE SCALING FROM 10 k(OHM) AND QHR STANDARDS USING A CRYOGENIC CURRENT COMPARATOR

June 1, 2008

Author(s)

Randolph Elmquist, George R. Jones Jr., Brian J. Pritchard, Marcos E. Bierzychudek, Felipe L. Hernandez

We describe a cryogenic current comparator (CCC) bridge for resistance scaling that provides improved measurement uncertainty over a range of resistance values...

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