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Displaying 1451 - 1475 of 3901

An Improved Two-Phase Pressure Drop Correlation for 180 degrees Return Bends

May 1, 2006
Author(s)
Piotr A. Domanski, Christian Hermes
A new correlation for two-phase flow pressure drop in 180? return bends is proposed based on a total of 241 experimental data points for R-22 and R-410A. The data span smooth tubes with inner diameters (D) from 3.25 mm to 11.63 mm, bend radiuses (R) from 6

Chemical and Physical Characterization of Poly(p-phenylene benzobisoxazole) Fibers Used in Body Armor

May 1, 2006
Author(s)
Joannie W. Chin, E Byrd, Amanda L. Forster, Xiaohong Gu, Tinh Nguyen, Kirk D. Rice, Walter J. Rossiter Jr, S J. Scierka, John R. Sieber, Paul E. Stutzman, Li Piin Sung
Problems with the performance and durability of body armor based on poly(p-phenylene benzobisoxazole (PBO) fiber became apparent in the summer of 2003, when PBO-based body armor that was less than 8 months was penetrated by a bullet. Mechanical testing of

Evaluation of Aerodynamic Drag and Torque for External Tanks in Low Earth Orbit

May 1, 2006
Author(s)
William C. Stone, Christoph J. Witzgall
A numerical procedure is described in which the aerodynamic drag and torque in low Earth orbit are calculated for a prototype Space Shuttle external tank and its components, the "LO2" and "LH2" tanks, carrying liquid oxygen and hydrogen, respectively, for

Damping of Stay-Cable Vibrations: Modeling Overview and Design Implications

April 25, 2006
Author(s)
Joseph A. Main, Nicholas P. Jones
Dampers have become widely accepted as an effective means of stay-cable vibration suppression and have been implemented on numerous bridges around the world. Dampers are typically attached to the stays transversely near the anchorages, and different types

Engineered Infills for Concrete Barriers

April 3, 2006
Author(s)
Kenneth A. Snyder, C Langton, B Clark, Chiara C. Ferraris, J Dawson
Entombment may be considered as an option for decommissioning nuclear concrete structures so that licenses for facilities on which these structures reside may be terminated. Prior to entombment, the nuclear facility permanently ceases operations and spent

Characterizing Gaseous Air Cleaner Performance in the Field

March 20, 2006
Author(s)
Cynthia H. Reed, Steven J. Emmerich, Steven J. Nabinger
As part of an ongoing effort to better understand the performance of indoor air cleaners in buildings, the National Institute of Standards and Technology (NIST) has completed a series of gaseous air cleaner field tests and model simulations. This paper

Elevator Controls

March 1, 2006
Author(s)
Richard W. Bukowski, R P. Fleming, Jeffrey Tubbs, Christopher Marrion, Jill Dirksen, Chris Duke, Debbie Prince, Lee F. Richardson, Dave Beste, Dottie Stanlaske
The development of firefighter elevators and special application egress elevators is reviewed. Recent activities of the elevator industry and NIST to develop standards and building code requirements for elevators for use by the fire service and by

Using LADAR to characterize the 3-D shape of aggregates: Preliminary results

March 1, 2006
Author(s)
Edward J. Garboczi, Geraldine S. Cheok, William C. Stone
In previous publications, we have shown how using x-ray computed tomography to obtain the raw 3-D data for the coordinates of the surface, and then converting this raw data into an analytical function for the surface via an expansion in spherical harmonic

In-Flight Suppressant Deployment Temperatures

February 28, 2006
Author(s)
Donald Bein
This report describes review of DoD military fixed-wing and rotary aircraft fire mishap/incident data applicable to assess temperatures at which aircraft fire suppressants have been deployed in engine nacelle and APU compartment fires. Another model is

Modeling the Influence of Limestone Filler on Cement Hydration in CEMHYD3D

February 1, 2006
Author(s)
Dale P. Bentz
The ASTM C150 standard specification for portland cement now permits the addition of up to 5 % limestone filler. While these and much higher levels of limestone filler substitution have been employed in Europe and elsewhere for many years, the change in

R-22 Replacement Status (in Italian)

February 1, 2006
Author(s)
J M. Calm, Piotr A. Domanski
Since its initial recognition in 1928 and commercialization in 1936, R-22 has been applied in systems ranging from the smallest window air conditioners to the largest chillers and heat pumps, including those for district cooling and heating. Individual

Cost-Effectiveness Tool Primer: Software Overview

January 31, 2006
Author(s)
Robert E. Chapman, Amy S. Rushing
Economic tools are needed to help the owners and managers of buildings, industrial facilities, and other critical infrastructure to select cost-effective combinations of mitigation strategies that respond to natural and man-made hazards. Economic tools
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