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Displaying 1251 - 1275 of 3839

Air Blast Loading of Cellular Media

July 1, 2007
Author(s)
George A. Gazonas, Joseph Main
Motivated by recent efforts to mitigate blast loading using energy-absorbing materials, this paper investigates the mechanics of uniaxial crushing of cellular sandwich plates under air blast loading using analytical and computational modeling. This model

Interpolation Procedures for Database-Assisted Design

July 1, 2007
Author(s)
Joseph A. Main
Database-assisted design (DAD) is a methodology of designing structures for wind loads that makes direct use of pressure time series from wind tunnel tests. This paper presents interpolation procedures that enable application of the DAD approach for cases

A Comparison of Predicted to Measured Photovoltaic Module Performance

June 27, 2007
Author(s)
Arthur H. Fanney, Brian P. Dougherty, Mark W. Davis
Computer simulation models to accurately predict the electrical performance of photovoltaic modules are essential. Without such models, potential purchasers of photovoltaic systems have insufficient information to judge the relative merits and cost

Role of Interfacial Water in the Adhesion Loss of Polymer/Substrate Systems and Composites

June 21, 2007
Author(s)
Tinh Nguyen, Joannie W. Chin, E Byrd, David Alshed, Cyril Clerici, Jonathan W. Martin
Water at the polymer/substrate interface in coatings, adhesives, and fiber-reinforced polymer composites is often the main cause of adhesion loss in these systems. Using experimental data measured in this study, we critically assess the role of interfacial

Building Information for Emergency Responders

June 8, 2007
Author(s)
Stephen J. Treado, Alan B. Vinh, David G. Holmberg, Michael A. Galler
This paper describes a methodology for controlling access to building information to approved external entities such as police, fire and public safety officials. Building automation systems frequently monitor critical building information, including the

Cone Calorimeter Analysis of UL-94 V-Rated Plastics

June 1, 2007
Author(s)
A B. Morgan, Matthew F. Bundy
Cone calorimeter analysis was conducted on 18 thermoplastics with different UL-94 vertical burn test (V) ratings. Ratings varied from V-0 to no rating (NR), and the types of thermoplastics included were polycarbonate (PC), acrylonitrile-butadiene-styrene

Workshop Objectives (NIST SP 1051)

May 3, 2007
Author(s)
Rodney A. Bryant
There is a need for real-time identification of hazards to enable selection of appropriate respiratory protection for firefighters. The challenge is to transfer the protocols and technology used in industrial environments where the respiratory threats are

Optimization of Finned-Tube Condensers Using an Intelligent System

May 1, 2007
Author(s)
Piotr A. Domanski, David A. Yashar
The refrigerant circuitry influences a heat exchanger s attainable capacity. Typically, a design engineer specifies a circuitry and validates it using a simulation model or laboratory test. The circuitry optimization process can be improved by using

A Stokes Permeability Solver for Three-Dimensional Porous Media

April 4, 2007
Author(s)
Dale P. Bentz, Nicos Martys
A set of C and Fortran computer programs have been developed for computing the permeability of three-dimensional porous media under incompressible Stokes flow conditions. In this NISTIR, the background for developing these codes is reviewed and the

Uniaxial Crushing of Cellular Sandwich Plates Under Air Blast

April 3, 2007
Author(s)
Joseph A. Main, George A. Gazonas
Sandwich plates with cellular metal cores are being widely considered for blast mitigation applications, due largely to the energy absorption capacity of the cellular core material. Computational simulations have shown that sandwich plates exhibit reduced

A Low Cost Digital Vibration Meter

April 1, 2007
Author(s)
William V. Payne, Jon Geist
This report describes the development of a low cost vibration amplitude sensor. The processes used to develop this sensor involve the use of Micro-Electronic and Mechanical Systems (MEMS) manufacturing techniques. The major mechanical element of the

Vibration of Tensioned Beams with Intermediate Damper. II: Damper Near Support

April 1, 2007
Author(s)
Joseph A. Main, Nicholas P. Jones
Exact analytical solutions are used to investigate the complex eigenfrequencies of tensioned beams with a viscous damper attached transversely near a support, for which the complex eigenfrequencies remain fairly close to their undamped values. This problem
Displaying 1251 - 1275 of 3839