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Displaying 2226 - 2250 of 3890

Polymer/Layered Silicate Nanocomposites from Thermally Stable Trialkylimidazolium-Treated Montmorillonite.

December 1, 2002
Author(s)
Jeffrey W. Gilman, W H. Awad, Rick D. Davis, John R. Shields, Richard H. Harris Jr., C H. Davis, A B. Morgan, T E. Sutto, J H. Callahan, Paul C. Trulove, H DeLong
The limited thermal stability of alkylammonium cations intercalated into smectite minerals (e.g., montmorillonite, MMT) and the processing instability of some polymers [polyamide-6 (PA-6) and polystyrene (PS)] in the presence of nanodispersed MMT have

Acoustophoretic Characterization of Cement Suspensions

November 1, 2002
Author(s)
Robert J. Flatt, Chiara C. Ferraris
Acoustophoresis has been used to study the evolution of the surface potential of hydrating cement suspensions because it is potentially capable of measuring zeta potentials of cement suspensions at concentrations high enough not to modify ion/particle

Calculation of Obstructed View Factors by Adaptive Integration

November 1, 2002
Author(s)
George Walton
This report describes the use of adaptive integration for the calculation of view factors between simple convex polygons with obstructions. The accuracy of the view factor calculation is controlled by a convergence factor. The adaptive integration method

CONTAMW 2.0 User Manual

November 1, 2002
Author(s)
William S. Dols, George Walton
This manual describes the computer program CONTAMW version 2.0 developed by NIST. CONTAMW is a multizone indoor air quality and ventilation analysis program designed to help you determine: airflows and pressures infiltration, exfiltration, and room-to-room

Database-Assisted Design and Wind Directionality Effects

November 1, 2002
Author(s)
A Rigato, P C. Chang, Emil Simiu
We present a simple methodology, developed for use in design assisted by electronic aerodynamic and climatological databases (for short, database-assisted design), that allows a realistic assessment of wind directionality effects. We apply the methodology

Database-Assisted Design for Wind: Basic Concepts and Software Development

November 1, 2002
Author(s)
T Whalen, Fahim H. Sadek, Emil Simiu
Standard provisions for wind loads on buildings have traditionally been based on summary tables and/or plots suitable for slide-rule calculations. The accuracy in the definition of wind loads inherent in such tables and plots is far lower than that

Development and Validation of Corridor Flow Submodel for CFAST

November 1, 2002
Author(s)
J. L. Bailey, Glenn P. Forney, P. A. Tatem, Walter W. Jones
The modeling of fire and smoke spread is an evolving field. As knowledge is acquired and resources become available, models are enhanced to make their predictions more accurate and/or their computations faster. This paper will discuss the Consolidated Fire

Fire Dynamics Simulator (Version 3): Users Guide (NISTIR 6748)

November 1, 2002
Author(s)
Kevin B. McGrattan, Glenn P. Forney, J E. Floyd, Simo A. Hostikka, Kuldeep R. Prasad
Fire Dynamics Simulator (FDS) is a computational fluid dynamics (CFD) model of fire-driven fluid flow. The software described in this document solves numerically a form of the Navier-Stokes equations appropriate for low-speed, thermally-driven flow with an

Simulation of SCC Flow

November 1, 2002
Author(s)
Nicos Martys, Chiara F. Ferraris
Predicting the rheological properties of concrete is essential for its optimal use in situations such as flow between rebars. The aggregate gradation and shape, as well as the rheological properties of the mortar or cement paste will affect the flow of SCC

Surface and Interface Properties of PVDF/Acrylic Copolymer Blends

November 1, 2002
Author(s)
Xiaohong Gu, Tinh Nguyen, Mark R. VanLandingham, D Nguyen
Poly(vinylidene fluoride) (PVDF) is commonly blended with amorphous polymers to improve its optical property. The surface and interface properties of PVDF blended with different amounts of poly(methyl methacrylate) and poly(ethyl acrylate) copolymer (PMMA

Round Robin Assessment of the Single Fiber Fragmentation Test

October 21, 2002
Author(s)
M J. Rich, L T. Drzal, Donald L. Hunston, Gale A. Holmes, Walter G. McDonough
The Versailles Project on Advanced Materials and Standards (VAMAS) was established following an economic summit meeting in 1982 held at Versailles by the Heads of State of the seven leading industrial nations and representatives from the Commission of the

Stiffness and Failure Behavior of Model Hybrid Composites

October 21, 2002
Author(s)
Donald L. Hunston, Walter G. McDonough
Many applications are exploring the use of hybrid composites; i.e., polymers reinforced with two different types of fibers, because such systems can have a superior balance of properties and/or a better balance of properties and cost. Unfortunately, the

BACnet Today- Significant new features and future enhancements

October 1, 2002
Author(s)
Steven T. Bushby, H M. Newman
The BACnet communication protocol standard is maintained by a standing committee of the American Society of Heating, Refrigerating, and air-conditioning Engineers under continuous maintenance procedures. Since its original publication in 1995 there have

Chapter 13: Economic Analysis and Green Buildings

October 1, 2002
Author(s)
S Fuller
Building economics, value engineering, and cost engineering are the three main fields that explicitly include an economic evaluation in building-related project analyses. The common theme that ties the three disciplines together is that each is concerned
Displaying 2226 - 2250 of 3890
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