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Displaying 14651 - 14675 of 73922

Thermal Degradation Studies of Alkyl-Imidazolium Salts and Their Application in Nanocomposites

February 19, 2017
Author(s)
W H. Awad, Jeffrey W. Gilman, Marc R. Nyden, Richard H. Harris Jr., T E. Sutto, J H. Callahan, Paul C. Trulove, H X. DeLong
Increasing the thermal stability of organically modified layered silicates is one of the key points in the successful technical application of polymer layered-silicates nanocomposites on the industrial scale. To circumvent the detrimental effect of the

Thermal Diffusivity of AIN Using the Photothermal Deflection Technique

February 19, 2017
Author(s)
E J. Gonzalez
The thermal conductivity of AIN specimens doped with Y2O3(5 wt.%) was determined using the photothermal deflection technique. The results agree within 10% of measurements previously made using the laser flash method. Thermal measurements on as-fired thin

Thermodynamics and Phase Diagrams

February 19, 2017
Author(s)
Ursula R. Kattner
Thermodynamics is a field of physics and chemistry. It uses mathematics to describe changes in energy and entropy (disorder) of a material that is subject to mechanical, thermal or chemical action. It is most frequently used to describe the conditions that

Time Resolved Size Distributions of Test Smokes and Nuisance Aerosols

February 19, 2017
Author(s)
Thomas Cleary
An electrical low-pressure impactor (ELPI) has been used to measure the size distribution of various test smokes and nuisance aerosols generated in the fire emulator/detector evaluator (FE/DE). Previously reported size results were time-averaged values

Toward an Integrated Concrete Performance Prediction Tool

February 19, 2017
Author(s)
Barbara C. Lippiatt
Industrial engineers and construction specifiers are increasingly concerned about the implications of their material design and product selection decisions, respectively, for the environment and public health. How will a given concrete design affect global

Transient Creep Cavity Growth in Structural Ceramics

February 19, 2017
Author(s)
A F. Bower, Tze J. Chuang
Long-term service life of a load-bearing ceramic component such as a turbine blade atelevated temperatures is often controlled by the rates of nucleation and growth of creepcavities at grain junctions and interfaces within the microstructure of the

U.S.-Japan Joint Panel on Wind and Seismic Effects

February 19, 2017
Author(s)
Stephen A. Cauffman
The U.S.-Japan Joint Panel on Wind and Seismic Effects is now entering its 33rd year. The Panel was formed in 1969 under the auspices of the U.S.-Japan Cooperative Program on Natural Resources (UJNR), one of three collateral programs that comprise the U.S

Ultra-Cold Collisions of Atoms and Molecules

February 19, 2017
Author(s)
Paul S. Julienne
The study of collisions of neutral atoms and molecules at ultralow collision energies is made possible by advances in techniques for cooling and trapping such species. Excellent reviews of laser cooling of atoms are given in the Nobel Lectures of Chu 2

Ultrasonic Extraction/Anodic Stripping Voltammetry for Determining Lead in Household Paint: Summary of a Laboratory Study

February 19, 2017
Author(s)
Walter J. Rossiter Jr, Blaza Toman, M Vangel, M E. McKnight, M Baghai Anaraki, A Signor, I Emenanjo, E Byrd
This paper summarizes the results a three-year study conducted to evaluate the reliability of field-portable ultrasonic extraction-anodic stripping voltammetry (UE/ASV) for determining the amount of lead in laboratory-prepared and field-sampled paint films

Unresolved Issues Related to Predicting the Service Life of Polymeric Materials

February 19, 2017
Author(s)
Jonathan W. Martin, Tinh Nguyen
Linking field and laboratory exposure results and predicting the service life of a polymeric materials exposed in its intended service environment have been major research goals of the polymeric materials community for over a century. Three methodologies

Use of Optical Probes and Laser Scanning Confocal Fluorescence Microscopy for High Throughput Characterization of Dispersion in Polymer Layered Silicate Nanocomposites

February 19, 2017
Author(s)
Jeffrey W. Gilman, Rick D. Davis, S Bellayer, P H. Maupin, Raghavan Dharmara, Joseph Langat, S Bourbigot, X Flambard, D M. Fox, Paul C. Trulove, Hugh C. De Long
The development of high throughput methods for studying polymer layered silicate nanocomposites (PLSN) is motivated by the fact that these materials represent a multiple parameter problem. We have developed a HT platform for the study of thermoplastic

Using Visualization To Better Understand Fire Dynamics

February 19, 2017
Author(s)
Glenn P. Forney
Computational tools have been developed at the National Institute of Standards and Technology (NIST) for modeling fire spread and smoke transport. These models include FDS (Fire Dynamics Simulator) for modeling fire spread and smoke transport and Smokeview

Validating Smoke Toxicity Tests

February 19, 2017
Author(s)
Richard Gann
This paper is the executive summary of NIST Technical Note 1453 (May 2003). The original abstract follows.This report presents the methodology for and results from a series of room-scale fire tests to produce data on the yields of toxic products in both

Vapor Pressure and Thermal Stability of MgB 2 at 0.1 mPa Total Pressure

February 19, 2017
Author(s)
Lawrence P. Cook, R Klein, Winnie Wong-Ng
The vapor pressure of Mg(g) over MgB 2(cr) for the reaction 2 MgB 2(cr) Mg(g)+MgB 4(cr) has been measured thermogravimetrically from 900 degrees celsius to 1100 degrees celsius at 0.1 mPa(1 atm) total pressure using a modified Knudsen effusion method and

Verification and Validation of CFAST, A Model of Fire Growth and Smoke Spread

February 19, 2017
Author(s)
Walter W. Jones, Richard D. Peacock, Glenn P. Forney, Paul A. Reneke
CFAST is a zone model capable of predicting the environment in a multi-compartment structure subjected to a fire. It calculates the time evolving distribution of smoke and fire gases and the temperature throughout a building during a user-specified fire

Versatile USAXS (Bonse-Hart) Facility for Advanced Materials Research

February 19, 2017
Author(s)
J Ilavsky, P Jemain, Andrew J. Allen, Gabrielle G. Long
The USAXS facility at UNICAT Sector 33 at the Advanced Photon Source (APS) is a world-class resource for advanced materials research emphasizing full-range charactrization of nanometer-scale to micrometer-scale microstructures. Receiving photons from an

Video Detection and Monitoring of Smoke Conditions

February 19, 2017
Author(s)
Thomas Cleary
Initial tests have been performed to assess detection limits and smoke obscuration monitoring for a video scene under different lighting and smoke concentration conditions. An illuminated exit sign located in the fire emulator/detector evaluator duct was

What a User Should Know About Selecting an Evacuation Model

February 19, 2017
Author(s)
Erica D. Kuligowski, Steve M. Gwynne
In recent years, evacuation models have been increasingly applied in an attempt to understand the outcome of emergency egress scenarios. This has been due to the introduction of performance-based codes and the availability of cost-effective, high

What Gets Measured, Gets Managed: A Case Study of Construction Safety

February 19, 2017
Author(s)
Robert E. Chapman
This article describes efforts within NIST's Building and Fire Research Laboratory to develop baseline measures for the National Construction Goals. The National Construction Goals were established in collaboration with representatives of the construction
Displaying 14651 - 14675 of 73922
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