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Conferences

Physicochemical Evaluation of Bioactive Polymeric Composites Based on Hybrid Amorphous Calcium Phosphates

August 1, 2000

Author(s)

Joseph M. Antonucci, Drago Skrtic, A W. Hailer, E D. Eanes

Amorphous calcium phosphate (ACP), an important precursor in the biological formation of hydroxyapatite (HAP), has recently been utilized as a bioactive filler...

An Improved Synthesis of Ethyl Alpha-Hydroxymethylacrylate, a Unique Isomeric Analog of HEMA

August 1, 2000

Author(s)

Joseph M. Antonucci, J W. Stansbury, Bruce O. Fowler

HEMA is widely used in dental adhesives, bioactive composites and resin-modified glass ionomer cements. In its polymeric forms it is used in a number of...

Reverberation Chamber Verification Procedures on How to Check if Your Chamber Ain't Broke and Suggestions on How to Fix It If It Is

August 1, 2000

Author(s)

John M. Ladbury

We present three tests for evaluating the agreement between measurements taken in a reverberation chamber and the expected results given by simple statistical...

A Standard Test Course for Urban Search and Rescue Robots

August 1, 2000

Author(s)

Adam S. Jacoff, Elena R. Messina, John Evans

One approach to measuring the performance of intelligent systems is to develop standardized or reproducible tests. These tests may be in a simulated environment...

Search Graph Formation for Minimizing the Complexity of Planning

August 1, 2000

Author(s)

Alberto Lacaze, Stephen B. Balakirsky

A large number of path planning problems are solved by the use of graph based search algorithms. There are a variety of techniques available to optimize the...

Performance Metrics for Intelligent Systems

August 1, 2000

Author(s)

John Evans, Elena R. Messina

Research into intelligent systems and intelligent control is burgeoning. However, there is no consensus on how to define or measure an intelligent system. This...

Time Synchronized Measurements in Cluster Computing Systems

August 1, 2000

Author(s)

Alan Mink, Robert J. Carpenter, M M. Courson

We describe hardware time synchronization instrumentation that we have developed which achieves time synchronization of better than one microsecond. The purpose...

NIST Workshop on Needs for Reference Biomaterials

August 1, 2000

Author(s)

John A. Tesk

On November 13, 1998, a workshop was held at the National Institute of Standards and Technology (NIST) to obtain a clearer assessment of the current needs for...

Quantum Electrodynamics and the Fundamental Constants

August 1, 2000

Author(s)

Peter J. Mohr, Barry N. Taylor

The fundamental constants are evaluated by comparison of the results of critical experiments and the theoretical expressions of these results written in terms...

Calibrated Thermal Microscopy of the Tool-Chip Interface in Machining

August 1, 2000

Author(s)

Howard W. Yoon, Matthew A. Davies, Timothy J. Burns, Michael Kennedy

A critical parameter in predicting tool wear during machining and in accurate computer simulations of machining is the spatially-resolved temperature at the...

Precision Measurement With Gravity

August 1, 2000

Author(s)

J E. Faller

In this paper two questions are addressed: (1) what is precision measurement? And (2) where do ideas come from? To answer these questions, research examples are...

Valence Mapping of Particulate 3D-Transition Metal Oxides Using Energy-Filtered Transmission Electron Microscopy

August 1, 2000

Author(s)

R M. Stroud, J H. Scott

We demonstrate here the feasibility of valence mapping of particulate samples, and discuss the factors that limit quantitative data extraction from the maps...

Mapping Chemically Heterogeneous Polymer System Using Chemical Modification and Atomic Force Microscopy

August 1, 2000

Author(s)

D T. Raghavan, Tinh Nguyen, Mark R. VanLandingham, Xiaohong Gu

Polymer coatings are heterogeneous and often contain nanoscale degradation -susceptible regions. Therefore, mapping and identification of these regions would...

Test Device Directivity for EMC Measurements

August 1, 2000

Author(s)

Galen H. Koepke, David A. Hill, John M. Ladbury

Assessing the Effects of an OATS Shelter; Is ANSI C63.7 Enough?

August 1, 2000

Author(s)

Robert T. Johnk, David R. Novotny, Claude Weil, H. W. Medley

This paper summarizes a recent measurement effort by NIST researchers at an open-area test site (OATS), operated by a large information technology equipment...

A Performance Measurement Environment for Cluster Computing

August 1, 2000

Author(s)

M M. Courson, Alan Mink, G J. Marcais, B Traverse

A number of factors promote frequent running of performance measurement codes for the evaluation and tuning of both applications and platforms. NIST is...

Cessation of Spherulitic Growth in Phase-Separating Polyolefin Blends

August 1, 2000

Author(s)

Haonan Wang, Charles C. Han

The Blends of two statistical copolymers of ethylene/hexene (PEH) and ethylene/butene (PEB) exhibit both phase separation and crystallization transitions. Using...

Shear Orientation of a Visoelastic Polymer-Clay Solution

August 1, 2000

Author(s)

G Schmidt, A Nakatani, Paul Butler, Alamgir Karim, Charles C. Han

The shear orientation of viscoelastic clay-polymer solutions was investigated by means of rheology, flow birefringence (δn) and small-angle neutron scattering...

AFM Studies of Confined Dewetting On Gradient Patterned Surfaces

August 1, 2000

Author(s)

Alamgir Karim, A Sehgal, Eric J. Amis

Spinodal dewetting of ultra thin films driven by thermal fluctuations is considered analogous to phase separation accompanied by composition fluctuations. Such...

Microcalorimeter EDS for Low Voltage Microanalysis

August 1, 2000

Author(s)

David A. Wollman, Dale Newbury, Sae Woo Nam, Gene C. Hilton, Kent D. Irwin, David A. Rudman, Steven Deiker, Norman F. Bergren, John M. Martinis

High Frequency Response of Optical Magnetic Field Sensors Using Rare-Earth Iron Garnet Films

August 1, 2000

Author(s)

N. Itoh, Kent B. Rochford, H. Minemoto, S. Ishizuka

We have measured the high frequency response of optical magnetic field sensors using bismuth-substituted rare-earch iron garnet films up to 1 GHz.

A Digital Readout Scheme for Arrays of Microcalorimeter X-ray Detectors

August 1, 2000

Author(s)

Sae Woo Nam, David A. Wollman, Gene C. Hilton, James A. Chervenak, Steven Deiker, Kent D. Irwin, John M. Martinis

Microcalorimeter EDS: Benefits and Drawbacks

August 1, 2000

Author(s)

David A. Wollman, Dale Newbury, Sae Woo Nam, Gene C. Hilton, Kent D. Irwin, David A. Rudman, Steven Deiker, Norman F. Bergren, John M. Martinis

The commercial introduction of high-count-rate, near-room-temperature silicon drift detectors (presently available) and high-energy-resolution cryogenic...

A sounding Rocket Mission to Study the Solar Soft X-Ray and EUV Emission Using Transition-Edge sensor Technology

August 1, 2000

Author(s)

K Wamba, H Walker, Aaron J. Miller, B. Cabrera, D W. Robertson, P F. Boerner, D S. Martinez-Galarce, S F. Powell, Sae Woo Nam, Kent D. Irwin, Steven Deiker, R B. Hoover, T W. Barbee, P F. Baker

We are developing a new sounding rocket payload, the Advanced Technology Solar Spectroscopic Imager (ATSSI) that will use an 8x8 array of transition edge...

In Situ and Ex Situ Spectroscopic Ellipsometry of Low-Temperature-Grown GaAs

July 30, 2000

Author(s)

Donald A. Gajewski, Nhan Van Nguyen, Jonathan E. Guyer, Joseph Kopanski, Curt A. Richter, Joseph G. Pellegrino

Application of XML Tools for Enterprise-Wide RBAC Implementation Tasks

July 27, 2000

Author(s)

Ramaswamy Chandramouli

The use of Extensible Markup Language (XML) and its associated APIs, for information modeling and information interchange applications is being actively...

A Method for Visualizing and Managing Role-Based Policies on Identity-Based Systems

July 27, 2000

Author(s)

David F. Ferraiolo, Serban I. Gavrila

In recent years, numerous commercial and experimental Role-Based Access Control (RBAC) implementations have emerged. Central to several of these RBAC systems...

The NIST Model for Role-Based Access Control: Towards a Unified Standard

July 26, 2000

Author(s)

R. Sandhu, David F. Ferraiolo, D. Richard Kuhn

This paper describes a unified model for role-based access control (RBAC). RBAC is a proven technology for large-scale authorization. However, lack of a...

Extinction Conditions of Non-Premixed Flames With Fine Droplets of Water and Water-NaOH Solutions

July 20, 2000

Author(s)

A K. Lazzarini, R. H. Krauss, H K. Chelliah, Gregory T. Linteris

Interactions of fine droplets of water and water-NaOH solutions with a steady, laminar counterflow methane-air flame are investigated, both experimentally and...

Creeping Flame Spread Along Fuel Cylinders in Forced and Natural Flows and Microgravity

July 20, 2000

Author(s)

M A. Delichatsios, R A. Altenkirch, Matthew Bundy, S Bhattacharjee, L Tang, K Sacksteder

Semianalytical expressions are developed for creeping flame spread parallel to a fuel cylinder axis so that spread rates measured or predicted for flat surfaces...

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