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Displaying 2676 - 2700 of 3908

Challenges in Developing Environmentally Safe Heat Pumping Systems

July 1, 2000
Author(s)
David Didion, J S. Brown
The advent of the global warming crisis has brought about a viewpoint, in many governments, that the halogen family of refrigerants should be replaced, in part or in toto, by the so-called natural refrigerants. For this proposal to be valid it is necessary

Flammability of Polymer Clay Nanocomposites Consortium: Year One Annual Report (NISTIR 6531)

July 1, 2000
Author(s)
Jeffrey W. Gilman, Takashi Kashiwagi, A B. Morgan, Richard H. Harris Jr., L D. Brassell, Mark R. VanLandingham, C L. Jackson
We recently found that polymer layered-silicate (clay) nanocomposites have the unique combination of reduced flammability and improved physical properties. However, the details of the fire retardant mechanism were not well understood. In October of 1998 a

Performance of Precast Concrete Shear Walls

July 1, 2000
Author(s)
A E. Schultz, Geraldine Cheok, R A. Magana
An experimental program is undertaken to enhance the knowledge base regarding seismic design of precast concrete shear walls. The emulation design and jointed design philosophies are described, and an idealization of the behavior of precast shear walls is

Performance of R-22 And Its Alternatives Working At High Outdoor Temperatures

July 1, 2000
Author(s)
S F. Yana Motta, Piotr A. Domanski
This paper examines the performance of R-22 and its possible replacements in an air-cooled air conditioner. The study focuses on the effect ofelevated outdoor temperatures on system capacity and Coefficient of Performance (COP). The refrigerants considered

Technical Support for the Study of Droplet Interactions with Hot Surfaces

June 21, 2000
Author(s)
Jiann C. Yang
The main objective is to provide technical support (literature review on water additives, fluid property and possibly droplet impact data) for the study of the dynamics of droplet/surface and droplet/flame interaction and its effect on burning cessation to

Flammability Assessment Methodology for Mattresses (NISTIR 6497)

June 1, 2000
Author(s)
Thomas J. Ohlemiller, John R. Shields, Roy A. McLane, Richard G. Gann
This study addresses the fire behavior of bed assemblies, including a mattress, foundation and bedclothes. The focus is on development and application of a reproducible means of simulating the thermal impact which burning bedclothes materials impose on a

Recent Progress in Nanoscale Indentation of Polymers Using the AFM

June 1, 2000
Author(s)
Mark R. VanLandingham, John S. Villarrubia, G F. Meyers
Regardless of the type of test, reliable indentation measurements require knowledge of the shape of the indenter tip. For indentation measurements involving sub-micrometer scale contacts, accurate knowledge of the tip shape can be difficult to achieve. In

Detection and Measurement of Middle Distillate Fuel Vapors Using Tunable Dye Lasers.

May 2, 2000
Author(s)
K L. Mcnesby, R T. Wainner, A W. Miziolek, W M. Jackson, I A. McLaren
A sensor for measurement of vapors from the hydrocarbon-based fuels JP-8, DF-2, and gasoline is described. The sensor is based upon a previously reported laser mixing technique that uses two tunable diode lasers emitting in the near-infrared spectral
Displaying 2676 - 2700 of 3908
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