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Displaying 1401 - 1425 of 3901

Concrete Rheology: Knowledge and Challenges?

September 13, 2006
Author(s)
Chiara F. Ferraris
The design of concrete with specified properties for an application is not a new science, but it has taken on a new meaning with the wide use of special concretes, such as self compacting concrete (SCC). General terms such as flow under its own weight and

Curing, Hydration, and Microstructure of Cement Paste

September 13, 2006
Author(s)
Dale P. Bentz, Paul E. Stutzman
This paper compares the hydration characteristics and microstructures of cement pastes with water-to-cement ratios (w/c) of 0.35 and 0.435, cured under saturated and sealed conditions. Degree of hydration is quantified by loss on ignition measurements. The

Mechanical Properties of Nanocomposite Latex Films via Instrumented Indentation

September 6, 2006
Author(s)
Aaron M. Forster, Stephanie S. Watson, Laura Johnson, Li Piin Sung
Inorganic particles, introduced into networked or glassy polymer films, have been used to increase the stiffness of films as a function of pigment loading. Latex films often contain inorganic pigments to increase the opaqueness of the film and to act as UV

A C-S-H Atomic-Scale Computational Toolkit: Application to Service Life Modeling

September 1, 2006
Author(s)
Kenneth A. Snyder, Raymond D. Mountain, Antonio Faraone
A computational toolkit is being developed for studying materials relevant to portland cement hydration. The toolkit will eventually include both a materials database and a collection of computational tools for constructing atomic-scale models, of both

Round Robin Study of Total Heat Flux Gauge Calibration at Fire Laboratories.

September 1, 2006
Author(s)
William M. Pitts, A V. Murthy, J L. Deris, J R. Filtz, K Nygard, D Smith, I Wetterlund
Total heat flux gauges are widely employed in fire research and fire testing laboratories. Several fire laboratories have developed systems for calibrating these gauges. There are major differences between these calibration facilities, and prior to this

Load-Displacement Relations for Nanoindentation of Viscoelastic Materials

August 2, 2006
Author(s)
Chien-Kuo Liu, S H. Lee, Li Piin Sung, Tinh Nguyen
A model based on the Burgers viscoelastic concept has been developed to describe the nanoindentation behaviors of polymeric materials. An analytical solution of displacement at the indenter tip has been derived based on the analog of the governing equation

Addressing Security in the Early Stages of the Project Life Cycle

August 1, 2006
Author(s)
Benjamin Matthews, Jonathan Sylvie, Edd Gibson, Stephen R. Thomas, Robert E. Chapman, Sang-Hoon Lee
This article summarizes the first phase of a three-phase research effort to develop and deploy best practices for project security on industrial projects. It shows how to address security early in the project life cycle and its impacts on the capital

Measurement of 100 nm and 60 nm Particle Standards by Differential Mobility Analysis

August 1, 2006
Author(s)
George W. Mulholland, Michelle K. Donnelly, Robert C. Hagwood, S R. Kukuck, Vincent A. Hackley, D Y. Pui
The peak particle size and expanded uncertainties (95 % confidence interval) for two new particle calibration standards are measured as 101.60 nm ? 1.02 nm and 60.68 nm ? 0.59 nm. The particle samples are polystyrene spheres suspended in filtered

MEMS Sensors for HVAC&R: Small, Fast, Cheap (in Polish)

August 1, 2006
Author(s)
David A. Yashar, Piotr A. Domanski
Microelectronic mechanical systems (MEMS) have revolutionized the market for sensors by providing small, fast-responding measurement devices at low cost. They have been widely accepted in several common products. As an example, today's automobile uses

R-22 Replacement Status (In Spanish)

August 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

Screening Candidates for 30 nm Spheres

August 1, 2006
Author(s)
Michelle K. Donnelly, Jiann C. Yang
This paper describes the preliminary screening process that was conducted to identify potential candidate particles to be used as the NIST Standard Reference Material (SRM) 30 nm spheres. Five different samples were obtained and measured using the NIST
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