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Displaying 2376 - 2400 of 3910

New Tools for Specifying BACnet

March 1, 2002
Author(s)
Steven T. Bushby
The BACnet communication protocol standard makes it possible to integrate a wide variety of building automation and controlproducts. Building owners and the consulting engineering community have had difficulty understanding how to write quality

Particle Formation in Laminar Flames Inhibited by Metals

March 1, 2002
Author(s)
Gregory T. Linteris, M D. Rumminger
Some organometallic compounds of iron are two orders of magnitude more effective at volume fraction than CF 3Br in premixed flames, an order of magnitude more effective in counterflow diffusion flames. The condensation of active gas-phase iron-containing

Promoting Quality in Laboratory Testing

March 1, 2002
Author(s)
J H. Pielert
The Cement and Concrete Reference Laboratory (CCRL) provides laboratory inspection and proficiency sample programs that are used to evaluate testing laboratory competency. CCRL, which is sponsored by ASTM, along with the American Association of State

Quantum Efficiency of Spectral UV on Polyurethanes

March 1, 2002
Author(s)
Tinh Nguyen, Jonathan W. Martin, E Byrd, E Embree
Polyurethanes (PU) are used extensively as exterior building materials. However, PU undergoes degration during outdoor exposure. The quantum efficiency of spectral UV on photodegration of an acrylic-urethane coating has been investigated. Samples of

The Visible Cement Data Set

March 1, 2002
Author(s)
Dale P. Bentz, S Mizell, Steven G. Satterfield, J E. Devaney, William L. George, Peter M. Ketcham, James R. Graham, J E. Porterfield, Daniel A. Quenard, F A. Vallee, H Sallee, E Boller, J Baruchel
With advances in X-ray microtomography, it is now possible to obtain three-dimensional representations of a material's microstructure with a voxel size of less then one micrometer. The Visible Cement Data Set represents a collection of 3-D data sets

Determination of Planck Mean Absorption Coefficients for HBr, HCl, and HF

February 1, 2002
Author(s)
Stephen P. Fuss, Anthony P. Hamins
The Planck mean absorption coefficient has been calculated for HBr HCl, and HF over a temperature range from 300 K-2300 K using data from the 1996 edition of the HITRAN molecular database. Plots of ap versus temperature showed monotonically decreasing

Development of a Reliability-Based Method of Service Life Prediction for Sealant

February 1, 2002
Author(s)
Christopher C. White, C Buch, Mark R. VanLandingham
Standard test methods, such as ASTM C719, evaluate sealant performance though threshold test measurements. This method and its derivatives do not offer reliable predictions of in-service performance. This article will detail efforts to move away from the

E-Concrete? Believe It!

February 1, 2002
Author(s)
G J. Frohnsdorff, Edward J. Garboczi
In recent years, the complexity of concrete mixture proportioning has increased dramatically. New chemical admixtures, such as high-performance superplasticizers and shrinkage-reducing admixtures, have been introduced into the marketplace. Due to both

Effects of Crosslink Density on Surface and Interface Properties of Amine-Cured Epoxy

February 1, 2002
Author(s)
Xiaohong Gu, Tinh Nguyen, Mark R. VanLandingham, D T. Raghavan
The effect of network changes on the surface and interface properties of amine-cured epoxy has been investigated. Samples of different crosslinked epoxies are prepared by mixing stoichiometrically pure diglycidyl ether of bisphenol A (n=0.03) with

Measuring Droplet Arrival Times Using Phase Doppler Interferometry

February 1, 2002
Author(s)
J F. Widmann, Cary Presser
The difficulty of accurately measuring droplet arrival time statistics is demonstrated using phase Doppler interferometry (PDI) measurements obtained in water sprays produced by pressure-swirl atomizers. It is shown that Doppler burst splitting, in which

Using Sensor Signals to Analyze Fires

January 23, 2002
Author(s)
William D. Davis, Thomas G. Cleary, Michelle K. Donnelly, S. D. Hellerman
Building fire sensors are capable of supplying substantially more information to the fire service than just the simple detection of a possible fire. Nelson, in 1984, recognized the importance of tying all the building sensors to a smart fire panel. In

Prototype Software for Contaminant-Based Design

January 2, 2002
Author(s)
George Walton, Andrew K. Persily
Outdoor air intake rates of mechanical ventilation systems have traditionally been determined using prescriptive methods based on ventilation requirements per unit floor area or per occupant. This approach has serious shortcomings. It provides no

An Economic Assessment of Selected Integration and Automation Technologies

January 1, 2002
Author(s)
Robert E. Chapman
This paper presents a critical analysis of the economic impacts of past, ongoing, and planned research of BFRL's construction systems integration and automation technologies (CONSIAT) Program. The CONSIAT program is an interdisciplinary research effort
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