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Conferences

A Causal Microwave Circuit Theory and Its Implications

August 1, 1999

Author(s)

Dylan Williams, Bradley Alpert

We will describe a new causal power-normalized waveguide equivalent-circuit theory and explore its implications. The new theory marries a power normalization...

Reverberation Chamber Relationships: Corrections and Improvements or Three Wrongs Can (Almost) Make a Right

August 1, 1999

Author(s)

John M. Ladbury, Galen H. Koepke

We correct a number of errors that have crept into the reverberation-chamber literature over the past several years.

Uncertainty Assessment for NIST Standard Antenna Measurements on the Open Area Test Site

August 1, 1999

Author(s)

Dennis G. Camell, Kenneth H. Cavcey

The Effects of Gaps in Ferrite Tiles on Both Absorbers and Chamber Performances

August 1, 1999

Author(s)

Christopher L. Holloway, Paul Mckenna, Robert T. Johnk

In this paper, we present a model that accounts for the gaps between ferrite tiles which occur during the installation of the tiles in anechoic chambers.

A Model for Predicting the Reflection Coefficient for Hollow Pyramidal Absorbers

August 1, 1999

Author(s)

Christopher L. Holloway, Edward Kuester, Martin Johansson, Robert T. Johnk, David R. Novotny

In this paper, we present an expression for the effective material properties of electromagnetic hollow pyramidal absorbers.

Electrical Measurements for Electronic Interconnections at NIST

August 1, 1999

Author(s)

Dylan Williams, Donald C. DeGroot

The National Institute of Standards and Technology (NIST) operates a number of research projects to advance measurement science and technology for the...

Effect of Surface Free Energy Anisotrophy on Dendrite Tip Shape

August 1, 1999

Author(s)

Richard J. Braun, J Zhang, John W. Cahn, Geoffrey B. McFadden, A A. Wheeler

We describe a mean field, free energy model that allows the computation of realistic phase diagrams for a particular set of ordering transitions in face...

Strain Rate Effects in the Single Fiber Fragmentation Test for Fiber Matrix Adhesion

August 1, 1999

Author(s)

Donald L. Hunston, Gale A. Holmes, R C. Peterson, Walter G. McDonough

In this paper, precise measurements of fiber break regions formed during the single fiber fragmentation testing procedure have been made for E-glass/diglycidyl...

Benchmark Data for Fuel Atomization and Combustion Models

August 1, 1999

Author(s)

J F. Widmann, S R. Charagundla, Cary Presser

Experimental data were collected for the purpose of validating multiphase combustion models and submodels. A spray combustor was fabricated that permits well...

The Next Generation of Active Cavity Radiometers for Space-Based Remote Sensing

August 1, 1999

Author(s)

Joseph P. Rice, Steven R. Lorentz, T M. Jung

Active cavity radiometers (ACRs) have been used for years to measure solar radiation and Earth radiation from low Earth orbit. Extant space-flight ACRs were...

High Q Backside Micromachined CMOS Inductors

August 1, 1999

Author(s)

Mehmet Ozgur, Mona E. Zaghloul, Michael Gaitan

Spiral inductors that are fabricated through a CMOS process, are micromachined by using a new post-processing procedure. In this new technique, the inductors...

Optimization of CMOS MEMS Microwave Power Sensors

August 1, 1999

Author(s)

V. Milanovic, M. Hopcroft, C. A. Zincke, Michael Gaitan, Mona E. Zaghloul

Micromachined power sensors with operation up to 50 GHz were recently achieved in CMOS technology. to improve their sensitivity and signal-to-noise ratio, while...

How Nonlinear Viscoelastic Matrix Behavior Influences Interfacial Shear Strength Measurements

July 30, 1999

Author(s)

Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson

Precise measurements of fiber break regions formed during the single fiber fragmentation testing procedure indicate that the calculated interfacial shear...

Enforcing Integrity While Maintaining Secrecy

July 27, 1999

Author(s)

D G. Marks

We consider the role of constraints in maintaining both secrecy and integrity in a multilevel secure database. In a multilevel database, certain integrity and...

Annotation Collaboration Tool via SMIL (ACTS)

July 26, 1999

Author(s)

Wo L. Chang

The Web has emerged as a dominant mode of making information available and is increasingly seen as the medium to support collaboration across boundaries of...

Portable High Accuracy Double Spectrometer for Ultraviolet Spectral Irradiance Measurements

July 23, 1999

Author(s)

E A. Thompson, E A. Early

A portable high accuracy double spectrometer for ultraviolet (UV) spectral irradiance measurements has been under development at the National Institute of...

A Study of Turn-Around Time for Selected Thermodynamic, Dimensional, and Mechanical Calibrations

July 15, 1999

Author(s)

G J. Rosasco

We have made a study of the turn-around time performance for the calibration services offered by the Process Measurements Division. The calibration process was...

New Primary Standards for Air Speed Measurement at NIST

July 15, 1999

Author(s)

Vern E. Bean, J. M. Hall

NIST has changed its primary standard for air speed measurements from a Pitot tube to a fiber optic laser Doppler anemometer (LDA). In earlier times, the Pitot...

Gloss Measurements at NIST

July 12, 1999

Author(s)

Maria E. Nadal, E A. Early, E A. Thompson

Specular gloss is the attribute of an object that causes it to have a shiny or lustrous appearance, and is commonly used to quantitatively evaluate appearance...

Applicability of Correlations Between the Species Formation and the Global Equivalence Ratio in a 1/2-Scaled ISO Compartment With Nongaseous Fuel.

July 5, 1999

Author(s)

C J. Wieczorek, U Vandsburger, B Lattimer, C McKay

Lifestyle developments on the global scale which manifest themselves in increased travel, increased elderly populations in assisted care facilities, and...

Acquisition, Analysis and Reporting of Fire Plume Data for Fire Safety Engineering

July 5, 1999

Author(s)

D T. Sheppard, B J. Meacham

In order to undertake engineering analyses and designs that can be readily accepted by building and fire authorities, fire protection engineers need engineering...

Mixed Layer Pyrolysis Model for Polypropylene

July 5, 1999

Author(s)

Kathryn M. Butler

A one-dimensional model describing the melting, degradation, and bubbling behavior of polypropylene exposed to a high heat flux is presented. The region of...

Particulate Entry Lag in Spot-Type Smoke Detectors

July 5, 1999

Author(s)

Thomas G. Cleary, Artur A. Chernovsky, William L. Grosshandler, Michael D. Anderson

It is well documented that alarm signals from spot-type smoke detectors (ionization and photoelectric) are delayed when the threshold value has been achieved...

Modeling of Sprinkler, Vent and Draft Curtain Interaction

July 5, 1999

Author(s)

Kevin B. McGrattan, Anthony P. Hamins, Glenn P. Forney

The International Fire Sprinkler, Smoke & Heat Vent, Draft Curtain Fire Test Project organized by the National Fire Protection Research Foundation (NFPRF)...

Numerical Modeling of Counterflow Diffusion Flames Inhibited by Iron Pentacarbonyl

July 5, 1999

Author(s)

M D. Rumminger, Gregory T. Linteris

This paper presents the first detailed numerical study of the extinction of methane-air counterflow diffusion flames by the super-effective agent iron...

Thermophysical Property Computer Packages from NIST of Interest to the Natural Gas Industry

July 1, 1999

Author(s)

Marcia L. Huber, Daniel G. Friend, Eric W. Lemmon

We discuss three computerized databases distributed by the Standard Reference Data (SRD) program of NIST, which are of interest to the natural gas industry.

Validating Uncertainty Analyses for Gas Flow Standards via Intra- and Inter-Laboratory Comparisons

July 1, 1999

Author(s)

John D. Wright, D B. Ward, G E. Mattingly

The Fluid Flow Group (FFG) at NIST maintains flow standards to perform calibrations of gas flowmeters over the 3.7 x 10 -2 L/min to 78,000 L/min flow range...

Lattice Boltzmann Simulations of Single and Multi-Component Flow in Porous Media

July 1, 1999

Author(s)

Nicos Martys, John G. Hagedorn, J E. Devaney

We examine the utility of the lattice Boltzmann method for modeling fluid flow in porous media. First the lattice Boltzmann method is validated for the case of...

Measurement of the Rheological Properties of Cement Paste: A New Approach

July 1, 1999

Author(s)

Chiara F. Ferraris

This paper presents a new approach for predicting the rheological properties of concrete from rheological measurements on cement paste and from concrete...

Flat Panel Display Metrology -- Less than Meets the Eye

July 1, 1999

Author(s)

Edward F. Kelley

Accurate measurement of electronic displays has become important in recent years owing to the advances in flat panel display technologies. A well-defined...

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