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Displaying 1701 - 1725 of 1947

Degradation and Nanofiller Release of Polymer Nanocomposites Exposed to UV

July 15, 2009
Author(s)
Tinh Nguyen, Bastien T. Pellegrin, Alexander J. Shapiro, Xiaohong Gu, Joannie W. Chin
Nanofillers are increasingly used to enhance multifunctional properties of polymers. However, recent research suggests that nanomaterials may have a negative impact on the environmental health and safety. Since polymers are susceptible to photodegradation

Structural Behavior of Ceramics

October 16, 2008
Author(s)
Sheldon M. Wiederhorn, Lin-Sien H. Lum
In this chapter, we discussed ceramic materials, materials that by and large do not deform plastically when subjected to high stresses. Consequently, ceramics have a low toughness and are very flaw sensitive. Methods of toughening ceramics involve grain or

Web Thermo Tables an On-Line Version of the TRC Thermodynamic Tables

July 14, 2008
Author(s)
Andrei F. Kazakov, Chris D. Muzny, Robert D. Chirico, Vladimir Diky, Michael D. Frenkel
It has long been understood that availability of thermophysical and thermochemical property data is vital to scientific research and industrial design. For over 65 years, the Thermodynamics Research Center (TRC) has been publishing tables of critically

Test Sequence Generation for Integration Testing of Component Software

November 22, 2007
Author(s)
Leonard J. Gallagher, Jeff Offutt
Ensuring high object interoperability is a goal of integration testing for object-oriented software. When messages are sent, receiving objects should respond as intended. Ensuring this is especially difficult when software uses components that are

Safety Standard Advancement Toward Mobile Robot Use Near Humans

June 26, 2006
Author(s)
Roger V. Bostelman, Tsai H. Hong, Rajmohan (. Madhavan, Tommy Chang
As mobile robots have increasingly improved onboard intelligence, they are being used in more flexible manufacturing, warehouse and/or military environments where humans may intervene and interact with these robots frequently causing increased hazards. The

Achieving Satellite Instrument Calibration for Climate Change (ASIC3)

May 18, 2006
Author(s)
Gerald T. Fraser, Raju V. Datla
The Workshop on Achieving Satellite Instrument Calibration for Climate Change (ASIC3) was a follow-up to a 2002 Workshop (Ohring et al., 2004; Ohring et al., 2005) that had developed the measurement requirements for a number of global climate variables

Automatically Testing Interacting Software Components

May 1, 2006
Author(s)
Leonard J. Gallagher, Jeff Offutt
One goal of integration testing for object-oriented software is to ensure high object interoperability. Sent messages should have the intended effects on the states and subsequent actions of the receiving objects. This is especially difficult when software

Guide for Developing Security Plans for Information Technology Systems

February 24, 2006
Author(s)
Marianne M. Swanson, Joan Hash, Pauline Bowen
The objective of system security planning is to improve protection of information system resources. All federal systems have some level of sensitivity and require protection as part of good management practice. The protection of a system must be documented

A Low Differential-Pressure Primary Standard for the Range 1 Pa to 13 kPa

December 1, 2005
Author(s)
A P. Miiller, Charles R. Tilford, Jay H. Hendricks
The National Institute of Standards and Technology (NIST) has completed the development of a low differential-pressure primary standard covering a range from 1 Pa to 13 kPa for operation with line pressures up to 200 kPa. The standard is based on a UIM

Guide to IPsec VPNs: Recommendations of the National Institute of Standards and Technology

December 1, 2005
Author(s)
Sheila E. Frankel, Karen Kent, Ryan Lewkowski, Angela Orebaugh, Ronald Ritchey, Steven Sharma
IPsec is a framework of open standards for ensuring private communications over public networks. It has become the most common network layer security control, typically used to create a virtual private network (VPN). A VPN is a virtual network ,built on

Design and Construction of Structural Systems (Appendices A-B). Federal Building and Fire Safety Investigation of the World Trade Center (NIST NCSTAR 1-1A) ***DRAFT for Public Comments***

September 1, 2005
Author(s)
D A. Fanella, A T. Derecho, S K. Ghosh
This report describes the provisions that were used to design and construct World Trade Center 1, 2, and 7. Included is a summary of the major provisions in the codes and standards together with the loads and load combinations that were used to design the

Design and Construction of Structural Systems (Appendices C-G). Federal Building and Fire Safety Investigation of the World Trade Center (NIST NCSTAR 1-1A) ***DRAFT for Public Comments***

September 1, 2005
Author(s)
D A. Fanella, A T. Derecho, S K. Ghosh
This report describes the provisions that were used to design and construct World Trade Center 1, 2, and 7. Included is a summary of the major provisions in the codes and standards together with the loads and load combinations that were used to design the

Healthcare Strategic Focus Area: Clinical Informatics

September 1, 2005
Author(s)
Conrad Bock, Lisa Carnahan, Steven J. Fenves, Michael Gruninger, V Kashyap, Bettijoyce B. Lide, Jim G. Nell, Ravi S. Raman, Ram D. Sriram
NIST has conducted several workshops and other information gathering activities, that have identified several key strategic opportunities in healthcare information technology (HIT) for NIST: clinical informatics; bioinformatics; medical devices

Mechanical and Metallurgical Analysis of Structural Steel. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-3) ***DRAFT for Public Comments***

September 1, 2005
Author(s)
Frank W. Gayle, Richard J. Fields, William E. Luecke, Stephen W. Banovic, Timothy J. Foecke, Christopher N. McCowan, Joseph D. McColskey, Thomas A. Siewert
This report is an overview of the results of the mechanical and metallurgical analysis of structural steel from the World Trade Center (WTC), part of the National institute of Standards and Technology Investigation of the WTC disaster of September 11, 2001

Flammability Properties of Polymer Nanocomposites with Single-Walled Carbon Nanotubes: Effects of Nanotube Dispersion and Concentration

January 1, 2005
Author(s)
Takashi Kashiwagi, F Du, K Winey, K M. Groth, John R. Shields, S Bellayer, H J. Kim, Jack F. Douglas
The effects of the dispersion and concentration of single walled carbon nanotube (SWNT) on the flammability of polymer/SWNT nanocomposites were investigated. The polymer matrix was poly (methyl lmethacrylate) (PMMA) and the SWNT were dispersed using a

Control of Surface Properties Using Fluorinated Polymer Brushes Produced by Surface-Initiated Controlled Radical Polymerization

November 1, 2004
Author(s)
L Andruzzi, A Hexemer, X Li, Christopher K. Ober, E K. Kramer, Giancarlo Galli, E Chiellini, Daniel A. Fischer
Surface-grafted styrene-based homopolymer and diblock copolymer brushes bearing semifluorinated alkyl groups were synthesized by nitroxide-mediated controlled radical polymerization on planar silicon oxide surfaces. The polymer brushes were characterized

Strength of Silicon, Sapphire in the Subthreshold Flaw and Glass Region

July 1, 2004
Author(s)
Yeon-Gil G. Jung, Antonia Pajares, R Banerjee, Brian R. Lawn
Strength properties are determined for monocrystalline silicon and sapphire and for soda-lime glass plates containing subthreshold flaws, i.e. flaws without detectable microcracks. Nanoindentations covering a wide range of loads are used to introduce flaws

Scattering Measurements for High Throughput Materials Science Research

January 1, 2004
Author(s)
A I. Norman, J Cabral, Alamgir Karim, Eric J. Amis
High throughput scattering methods are employed to study phase behavior over a concentration gradient of either Polystyrene (PS) in a Polystyrene/Polybutadiene (PS/PB) blend, or of diblock copoly(ethyleneoxide-butyleneoxide) in water. The combinatorial

Photopolymerization Kinetics of Methacrylate Dental Resins

August 1, 2003
Author(s)
Sabine H. Dickens, J W. Stansbury, Kwang-Woo Choi, C J. Floyd
The photopolymerization kinetics of typical dental dimethacrylate monomers were studied by differential photo-calorimetry. Increasing proportions of the low viscous diluent monomer triethylene glycol dimethacrylate (TEGDMA) were added to either Bis-GMA (2
Displaying 1701 - 1725 of 1947
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