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Displaying 50001 - 50025 of 73970

Diffusionless Electron Transfer of Microperoxidase-11 on Gold Electrodes

July 9, 1999

Author(s)

T Ruzgas, Adolfas Gaigalas

Microperoxidase-11, MP-11, is made by proteolytic digestion of cytochrome c, cyt. c. It consists of a polypeptide of 11 amino residues attached covalently to the heme. Given that MP-11 has a more exposed heme than the complete protein, it would seem that

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 tools and methods with known degrees of accuracy and reliability. Furthermore, fire protection

An Ultra-Small-Angle Neutron Scattering Study of the Restructuring of Sheared Colloidal Silica Gels

July 5, 1999

Author(s)

Chris D. Muzny, B D. Butler, H J. Hanley, M Agamalian

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 urbanization require increased attention to fire safety in dense occupation environments. Statistics

Graphical User Interfaces

July 5, 1999

Author(s)

Jean C. Scholtz

This chapter on graphical user interfaces gives the reader the history of interfaces of this type and some evidence from user studies about the usefulness of graphical interfaces. The different types of architectures used in applications with graphical

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 vigorous bubbling observed in experiment is represented as a mixed layer of uniform temperature

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) brought together a group of industrial sponsors to support and plan a series of large scale tests to

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 pentacarbonyl. Calculations using a gas-phase chemical mechanism reproduce the magnitude of inhibition

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 outside the detector housing as a result of convective transport of smoke through the detector to

Reflectance Standards at Ultraviolet Wavelengths

July 2, 1999

Author(s)

P Y. Barnes, E A. Early, Maria E. Nadal

Polytetrafluoroethylene (PTFE) is widely used in remote sensing applications requiring a diffuse reflectance standard for detector calibration. The bi-directional and directional-hemispherical reflectance properties of both pressed and sintered PTFE were

A Comparison of 1 T-omega and 10 T-omega High Resistance Standards Between NIST and Sandia

July 1, 1999

Author(s)

Dean G. Jarrett, Ronald F. Dziuba, Marlin E. Kraft

A Critical Comparison Between Time and Frequency Domain Relaxation Functions

July 1, 1999

Author(s)

Chad R. Snyder, F I. Mopsik

Considerable work has been performed on providing a theoretical basis for the KohlrauschWilliamsWatts (KWW) and HavriliakNegami(HN) relaxation functions. Because of this, several papers have examined the ''interconnection'' of these two functions. In this

Adsorption From Solutions on Synthetic Hydroxyapatite: Nonaqueous Versus Aqueous Solvents

July 1, 1999

Author(s)

D N. Misra

It is useful in restorative dentistry and etiology of bone diseases to know that certain general rules may be derived from a priori considerations of the adsorption of chemicals to synthetic hydroxyapatite (which is the structural prototype of tooth and

Analysis and Computation of Travelling Wave Solutions of Bistable Differential-Difference Equations

July 1, 1999

Author(s)

C E. Elmer, E S. Vanleck

We consider a variant of Newton's method for solving nonlinear differential-difference equations arising from traveling wave equations of large class of nonlinear evolution equations. Using the Fredholm theory developed by J. Mallet-Paret we prove

Analyzing the Effects of Capacitances-to-Shield in Sample Probes on AC Quantized Hall Resistance Measurements

July 1, 1999

Author(s)

Marvin E. Cage, Anne-Marie Jeffery

We analyze the effects of the large capacitances-to-shields existing in all sample probes on measurements of the ac quantized Hall resistance R H. The object of this analysis is to investigate how these capacitances affect the observed frequency dependence

Are Coordinated Roadmaps for Compound Semiconductor Based Technologies Needed? A Proposal for Smarter Investments

July 1, 1999

Author(s)

Herbert S. Bennett, Christopher M. Snowden, R. V. Atta

A necessary, but not sufficient condition for the success of commercial off-the-shelf (COTS) defense procurement requires improved coordinated planning and priority setting between those in primarily commercial organizations and those in primarily defense

Benchmark Experimental Database for Multiphase Combustion Model Input and Validation: Characterization of the Inlet Combustion Air

July 1, 1999

Author(s)

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

The air flow through a vane-cascade swirl generator is examined both experimentally and numerically to characterize the inlet combustion air flow entering a reference spray combustion facility at NIST. A three-dimensional model is used to simulate the

Characterization of Power Electronics System Interconnect Parasitics Using Time Domain Reflectometry

July 1, 1999

Author(s)

Huibin Zhu, Allen R. Hefner Jr., Jih-Sheng Lai

The significance of interconnect parasitics of power electronics system is their affects on converters' EMI-related performances, such as voltage/current spikes, dv/dt, di/dt, conducted/radiated EMI noise, and the like. In this paper, a time domain

Committee Reports for the 84th National Conference on Weights and Measures, July 25-29, 1999, Burlington, VT

July 1, 1999

Author(s)

G M. Ugiansky, J L. Land

The 84th Annual Meeting of the National Conference on Weights and Measures will be held in Burlington, VT, July 25-29, 1999. The theme of the conference is Setting Standards of Excellence in Pursuit of Equity.The National Conference on Weights and Measures

Cryogenic Microcalorimeters for X-Ray Microanalysis

July 1, 1999

Author(s)

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

Cumulative Seismic Damage of Circular Bridge Columns: Benchmark and Low-Cycle Fatigue Tests

July 1, 1999

Author(s)

A El-Bahy, S K. Kunnath, William C. Stone, A W. Taylor

An experimental study was undertaken to investigate cumulative damage in reinforced concrete circular bridge piers subjected to a series of earthquake excitations. Twelve identical quarter-scale bridge columns, designed in accordance with current AASHTO

Developing Data and Database Standards in Science: Some Challenges and How CODATA Can Help Meet Them

July 1, 1999

Author(s)

J R. Rumble

The triple revolutions caused by advanced computers, advanced informatics and the Internet have changed forever the way scientific and technical data are stored, located and disseminated. There is no turning back. Today almost every scientist uses the

Digital Images and Computer Modelling

July 1, 1999

Author(s)

Edward J. Garboczi, Dale P. Bentz, Nicos Martys

This chapter describes how digital images of porous materials can be analyzed to give information about the structure and properties of the material, describes various ways 3-D digital-image-based models can be generated to help understand real materials.

Dispersed Liquid Agent Fire Suppression Screen Apparatus

July 1, 1999

Author(s)

Jiann C. Yang, Michelle K. Donnelly, William L. Grosshandler, N C. Prive

The design, construction, demonstraion and operation of a bench-scale device capable of screening the fire suppression efficiency of liquid agents are described in detail in this report. The apparatus is based on a well-characterized flame, a means to

Dynamic Interrogation of a Basic Cutting Process

July 1, 1999

Author(s)

Matthew A. Davies, Michael Kennedy, Jon R. Pratt, Christopher J. Evans

A dynamic cutting fixture based on the test rig pioneered by Peters et al. has been developed to aid investigations of cutting process dynamics. This active fixture consists of a flexure-based tool holder with a single dominant modal direction, two voice

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