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Displaying 13001 - 13025 of 74220

NIST: A Century in the Business of Fire Safety

February 19, 2017
Author(s)
Richard Gann
This year, the National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS), turned 100 years old. During that century, NBS/NIST measurement technology has done much to enable the business of fire safety. Today

North American Standards and Specifications for Portland Cement

February 19, 2017
Author(s)
J H. Pielert, G J. Frohnsdorff
The earliest work in the United States on the development of portland cement standards was conducted by the American Society of Civil Engineers in the late 1800s. ASTM and the Federal government joined the effort in the early 1900s and ASTM C9 American

Nuclear Magnetic Resonance and X-Ray Absorption Spectroscopic Studies of Lithium Insertion in Silver Vanadium Oxide Cathodes

February 19, 2017
Author(s)
N D. Leifer, A Colon, K Martocci, S G. Greenbaum, Faisal Alamgir, T B. Reddy, N R. Gleason, R A. Leising, E S. Takeuchi
Structural studies have been carried out on Ag2V4O11 (silver vanadium oxide, SVO) and LixAg2V4O11, lithiated SVO with x = 0.72, 2.13 and 5.59 using Nuclear Magnetic Resonance (NMR) and X-ray Absorption Spectroscopy (XAS). Lithium-7 NMR indicates the

Numerical Modeling of Fire Spread Through Individual Trees and Shrubs

February 19, 2017
Author(s)
William E. Mell, Samuel Manzello, Alexander Maranghides
Fire spread through suspended vegetation, such as tree crowns, is a basic component of wildland fires. Most models of fire spread do not resolve the burning of individual trees. Instead, fire spread through a forest canopy, representing a collection tree

On the Aeroelastic Indifference of Brancusi s Endless Column

February 19, 2017
Author(s)
Rene D. Gabbai
Brancusi s Endless Column (T rgu-Jiu, Romania) is an interesting case study in bluff body aeroelasticity. It has been referred to as aeroelastically indifferent owing to its remarkable aeroelastic stability with respect to galloping. The column s behavior

On the Aeroelastic Indifference of Brancusi's Endless Column

February 19, 2017
Author(s)
Rene D. Gabbai
Brancusi s Endless Column (T rgu-Jiu, Romania) has been referred to as aeroelastically indifferent owing to its remarkable aeroelastic stability. The column s behavior has been attributed to its unconventional shape. However, calculations presented here

Optical and Structural Studies of Strain-Relaxed InxGa1-xN Films on GaN/sapphire with 0.04

February 19, 2017
Author(s)
Larry Robins, J T. Armstrong, Mark D. Vaudin, Charles E. Bouldin, Joseph Woicik, Albert J. Paul, W. R. Thurber, Ryna B. Marinenko
The structures of a set of InxGa1-xN films grown by atmospheric-pressure MOCVD onGaN buffer layers on c-plane sapphire, with compositions in the range 0.04 x 0.47, were characterized by x-ray diffraction (XRD). Several films were also examined by

Optics

February 19, 2017
Author(s)
Joseph Reader
The field of optics is summarized to assist in the solution of practical optics problems by working scientists. Over seventy formulas are presented dealing with reflection and refraction, absorption, lenses, mirrors, diffraction, interference, and spectra

Particulate Ceramic Composites: Their High-Temperature Creep Behavior

February 19, 2017
Author(s)
Sheldon M. Wiederhorn
Particulate composites, such as liquid-phase sintered silicon nitride and reaction-bonded silicon carbide, are being considered for use in applications where superior chemical and mechanical behavior at high temperatures are essential. Superior strength

Performance Evaluation of a 3D Imaging System for Vehicle Safety

February 19, 2017
Author(s)
Alan M. Lytle, Sandor S. Szabo, Geraldine S. Cheok, Kamel S. Saidi, Richard J. Norcross
The NIST Construction Metrology and Automation Group (CMAG), in cooperation with the NIST Intelligent Systems Division (ISD), is developing performance metrics and standard tests for the evaluation of 3D imaging systems used in autonomous mobility

Phase Diagrams for Zirconium and Zirconia Systems

February 19, 2017
Author(s)
H Ondik, H F. McMurdie
This compilation is the first volume in the Phase Equilibria Diagram series focused on a single element, zirconium. The volume combines over 400 new results with diagrams and commentaries published previously to form a focused collection of 1020 diagrams

Phase Equilibria Data for Electronic Ceramics Published

February 19, 2017
Author(s)
Terrell A. Vanderah
The first volume of a collection of phase diagrams focused on the increasingly important field of electronic ceramics was presented to the American Ceramic Society (ACerS) at its annual meeting in April 2003. The new volume details the phase equilibria of

Phase Equilibria Diagrams - Volume XIII: Oxides

February 19, 2017
Author(s)
Robert S. Roth
This volume is the thirteenth of the topically-oriented series of phase diagram compilations and the eighth to appear since the National Institute of Standards and TEchnology (NIST) and the American Ceramic Society (ACerS) embarked on a jointly-sponsored

Phase Equilibria of the High Tc Superconductors in the (Bi, Pb) -SR-Ca-Cu-O System

February 19, 2017
Author(s)
Winnie Wong-Ng, Lawrence P. Cook, W Greenwood, Anthony J. Kearsley
Applications of (Bi,Pb)-Sr-Ca-Cu-O phase equilibria include material synthesis, melt processing and single crystal growth. Both liquidus and subsolidus data are of central importance. For the determination of liquidus data, we have used a wicking technique

Phase Relations in Ba-(Nd,Eu,Gd)-Cu-O Coated Conductor Films

February 19, 2017
Author(s)
Winnie Wong-Ng, Igor Levin, Joseph J. Ritter, Lawrence P. Cook, Guangyao Liu, Makoto Otani, Christopher E. Lucas, Shailee P. Diwanji, Ron Feenstra, P Goyal, Mark D. Vaudin
Knowledge of phase relations in thin films of Ba2RCu3O6+x (where R=lanthanides or mixed lanthanides) is needed to guide the processing of coated conductors. High-temperature X-ray diffraction studies of Ba2RCu3O6+x films deposited using the

Phase-Correct Bond Lengths in Crystalline-Ge x Si l-x Alloys

February 19, 2017
Author(s)
Joseph Woicik, K E. Miyano, C A. King, R W. Johnson, J G. Pellegrino, T L. Lee, Z H. Lu
Extended x-ray absorption fine structure performed at the Ge-K edge has determined the Ge-Ge and Ge-Si bond lengths in a series of crystalline-Ge l-x alloys (x [greater than/less than] 0.5) to be compositional dependent. This high-precision measurement was
Displaying 13001 - 13025 of 74220