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Conferences

Dual-CGH Interferometry Test for X-Ray Mirror Mandrels

June 15, 2008

Author(s)

Guangjun Gao, John Lehan, Ulf Griesmann

We describe a glancing-incidence interferometric double-pass test, based on a pair of computer generated holograms (CGHs), for mandrels used to fabricate x-ray...

Design of a Turn-Key 10 V Programmable Josephson Voltage Standard System

June 13, 2008

Author(s)

Paul D. Dresselhaus, Mike Elsbury, Charles J. Burroughs, David I. Olaya, Samuel P. Benz, Norman F. Bergren, Robert E. Schwall, Zoya Popovic

NIST is designing a 10 V Programmable Josephson Voltage Standard (PJVS) system with an improved microwave design and arrays of stacked NbXSi1-x-barrier...

Thermal Network Component Models for 10 kV SiC Power Module Packages

June 13, 2008

Author(s)

Jose M. Ortiz, Madelaine H. Hernandez, Tam H. Duong, Scott G. Leslie, Allen R. Hefner Jr.

The DARPA WBGS-HPE program is developing 100 A, 10 kV SiC power modules to demonstrate the viability of a 2.75 MVA Solid State Power Substation that uses 10 kV...

Electro-Thermal Simulation of a 100 A, 10 kV Half-Bridge SiC MOSFET/JBS Power Module

June 13, 2008

Author(s)

Tam H. Duong, Jose M. Ortiz, R. N. Raju, Allen R. Hefner Jr.

This paper presents the results from a parametric simulation study that was conducted to optimize the performance of 100 A, 10 kV, 20 kHz half-bridge SiC MOSFET...

Proceedings of the Static Analysis Workshop (SAW 2008)

June 12, 2008

Author(s)

Paul E. Black, Elizabeth N. Fong

Static Analysis Workshop (SAW 2008) was held on June 12, 2008 in Tucson, Arizona and was co-located with ACM SIGPLAN 2008 Conference on Programming Language...

Modeling and Simulation for Sustainable Manufacturing

June 11, 2008

Author(s)

Deogratias Kibira, Charles R. McLean

With increasing frequency the news media reports that the planet is warming, pollutants are contaminating the environment, energy costs are rising, and precious...

Design of Experiments Approach to Verification and Uncertainty Estimation of Simulations based on Finite Element Method

June 11, 2008

Author(s)

Jeffrey T. Fong, James J. Filliben, Nathanael A. Heckert, Roland deWit

A fundamental mathematical modeling and computational tool in engineering and applied sciences is the finite element method (FEM). The formulation of every such...

Scanning Probe Microscopy for Dielectric and Metal Characterization

June 10, 2008

Author(s)

Joseph J. Kopanski, Thomas R. Walker

The properties of both insulators and metals can be characterized capacitively with scanning probe microscopy, though the techniques employed are different...

Understanding EuP and REACH

June 10, 2008

Author(s)

John V. Messina, Eric D. Simmon

There has been a world-wide trend towards legislation meant to encourage sustainable manufacturing and minimize the environmental impact of product...

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...

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...

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...

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)...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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