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Displaying 14576 - 14600 of 73922

Raman Stress Evaluation: Hydrostatic vs. Biaxial Calibration

February 19, 2017
Author(s)
L M. Braun, Grady S. White
Comparisons of two technical approaches for stress measurement based on the peak shifts associated with micro-Raman spectra are described. Stress values were obtained from evaluation of the relationship between peak shift and stress determined by both a

Rapid Detection of Thin-Film Interfacial Reactions by MEMS-DSC

February 19, 2017
Author(s)
Lawrence P. Cook, Richard E. Cavicchi, Yanbao Zhang, Mark D. Vaudin, Christopher B. Montgomery, William F. Egelhoff Jr., Martin L. Green, Leslie Allen
A MEMS-based differential scanning calorimeter (DSC) has been used to characterize the Ni/Si interfacial reaction in thin films at ramp rates of 940 C/s and 3760 C/s. The DSC devices were fabricated using CMOS semiconductor processing technology, and were

Reactive Molecular Dynamics Simulations of the Thermal Degradation of Polymers: Comparison to Experimental Measurements

February 19, 2017
Author(s)
Marc R. Nyden, Stanislav Stoliarov, R Lyon, C S. Jee, Z X. Guo, P R. Westmoreland, Vadim D. Knyazev
The results of reactive molecular dynamics simulations of the thermal degradation of several polymers, poly(isobutylene), poly(methyl methacrylate), and poly(bisphenol A carbonate), are compared to experimental measurements of product distributions and

Real Fire Performance of Partition Assemblies: Insulated and Non-Insulated Assemblies

February 19, 2017
Author(s)
Samuel Manzello, Richard Gann, S R. Kukuck, Kuldeep Prasad, Walter W. Jones
Two gypsum wall assemblies were exposed to intense real-scale compartment fires, from the time of ignition to beyond flashover. The construction of each assembly (2.44 m by 2.44 m) was identical, with the exception that one of the wall assemblies was

Recent Developments in Building Fire Detection Technologies

February 19, 2017
Author(s)
William L. Grosshandler, Jason D. Averill, Thomas Cleary, D W. Weinert
Sensing technologies and their application to detecting fires in buildings continue to evolve, and recent advances are summarized in this article. Work being conducted at NIST on characterizing smoke and on bench-scale evaluation of multi-element detectors

Relationship Between Microstructure and Wear of Dental Ceramics and Composite Resins

February 19, 2017
Author(s)
V S. Nagarajan, S Jahanmir, B Hockey, Victoria Thompson
The effect of microstructure on the wear mechanisms of glass-ceramics and resin composites was studied. Wear tests on both types of materials were conducted using a pin-on-disk apparatus. Wear of glass-ceramics increased with increasing mica platelet

Relationship Between Quantitative Dispersion and Physical Properties of PMMA/SWNT Nanocomposites

February 19, 2017
Author(s)
Takashi Kashiwagi, Jeffrey Fagan, Keith Yamamoto, A N. Heckert, Stefan D. Leigh, Jan Obrzut, F Du, Sheng Lin-Gibson, Minfang Mu, K Winey, R Haggenmueller, Jack F. Douglas
Six PMMA/SWNT(0.5 wt%) nanocomposite samples intended to have different dispersion levels were prepared by the coagulation method using six different concentrations of SWNTs in DMF from 0.05 mg/ml to 1.2 mg/ml. The morphology of the samples was determined

Report of the NIST Workshop on Data Exchange Standards at the Construction Job Site

February 19, 2017
Author(s)
Kamel S. Saidi, Alan M. Lytle, William C. Stone
The Building and Fire Research Laboratory of the National Institute of Standards and Technology, in cooperation with the Fully Integrated and Automated Technology (FIATECH) consortium, sponsored a workshop on data exchange standards at the construction job

Research & Development Program for the Safety of Threatened Buildings

February 19, 2017
Author(s)
William L. Grosshandler
A series of tragic events in the United States over the past decade, punctuated by the collapse of the World Trade Center on September 11, 2001, has exposed the vulnerability of public buildings to uncontrolled fires, explosions, and biological attack

Results of Shear Resistance Tests of Manufactures House Walls

February 19, 2017
Author(s)
Michael A. Riley, R E. Vega
The tests reported herein were intended to gain information on how manufactured home shear walls perform under extreme loads. The specimens tested represent sections from a typical manufactured home. The test results will be used for analytical modeling

Simulating Enclosure Fire Dynamics

February 19, 2017
Author(s)
Howard R. Baum
At least three different physics based approaches to fire dynamics simulations have evolved over the years; lumped parameter or ''zone models'', computational fluid dynamics models based on classical trubulence modeling techniques, and large eddy
Displaying 14576 - 14600 of 73922
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