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Displaying 31226 - 31250 of 74260

R-22 Replacement Status (in Russian)

June 25, 2008
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

Boiling with Refrigerants and Nanolubricants

June 24, 2008
Author(s)
Mark A. Kedzierski
Is it possible to improve refrigerant/lubricant boiling with nanoparticles? If so, what size of particles should be used? What s the particle material and in what concentration should they be applied to obtain the best improvement in performance? These are

Steady-state and time-resolved photoluminescence from relaxed and strained GaN nanowires grown by catalyst-free molecular-beam epitaxy

June 24, 2008
Author(s)
John B. Schlager, Kristine A. Bertness, Paul T. Blanchard, Lawrence H. Robins, Alexana Roshko, Norman A. Sanford
We report steady-state and time-resolved photoluminescence (TRPL) measurements on individual GaN nanowires (6-20 micrometers in length, 30-940 nm in diameter) grown by nitrogen-plasma-assisted, catalyst-free MBE on Si(111) and dispersed onto fused quartz

A Real World Pilot implementation of the Core Manufacturing Simulation Information Model

June 23, 2008
Author(s)
Swee K. Leong, Marcus Johansson, Bj?rn Johansson, Yung-Tsun T. Lee, Frank H. Riddick
While software for discrete event simulation (DES) has emerged into sophisticated tools for decision support in a wide range of contexts, the need to integrate DES tools with other applications is increasing. In the industrial engineering context

Model Based Uncertainty Analysis in Inter-Laboratory Studies

June 23, 2008
Author(s)
Blaza Toman, Antonio M. Possolo
Statistical analysis of key comparison and inter-laboratory experiments is required to produce an estimate of the measurand called a reference value and further, measures of equivalence of the participating laboratories. Methods of estimation of the

Smoke Control and Occupant Evacuation at the World Trade Center

June 21, 2008
Author(s)
M J. Ferreira, S M. Strege, Richard Peacock, Jason D. Averill
This paper examines smoke control and occupant evacuation in WTC 1 and WTC 2 on September 11, 2001focusing on the impact region and above for each tower. Approximately 2,000 individuals were at or above the area of impact in WTC 1 and WTC 2 who did not

High-efficiency, ultra-low-noise all-fiber photon pair source

June 20, 2008
Author(s)
Shellee D. Dyer, Martin J. Stevens, Burm Baek, Sae Woo Nam
We demonstrate an all-fiber photon pair source with the highest coincidence-to-accidental ratio (CAR) reported to date in the fiber optic telecom C-band. We achieve this through careful optimization of pair production efficiency as well as careful

Reflective attenuator for high energy laser measurements

June 20, 2008
Author(s)
John H. Lehman, David J. Livigni, Xiaoyu X. Li, Christopher L. Cromer, Marla L. Dowell
A high-energy laser attenuator in the range of 250 mJ (20 nsec pulse width, 10 Hz repetition rate, 1064 nm wavelength) is described. The optical elements which constitute the attenuator are mirrors with relatively low reflectance, oriented at 45° angle of

Entangled states of trapped atomic ions

June 19, 2008
Author(s)
Rainer Blatt, David J. Wineland
This article reviews recent experiments on entanglement and quantum information processing that use trapped ions.  It is intended to give a brief summary of the status of the field and indicate future directions and challenges.

Micro-engineered local field control for high-sensitivity multi-spectral MRI

June 19, 2008
Author(s)
Gary Zabow, Stephen Dodd, John M. Moreland, Alan P. Koretsky
In recent years, biotechnology and biomedical research have benefited from the introduction of a variety of specialized nanoparticles whose well-defined, optically distinguishable signatures enable simultaneous tracking of numerous biological indicators

A Molecular Model for Toughening in Double-Network Hydrogels

June 18, 2008
Author(s)
Vijay Tirumala, Sanghun Lee, Taiki Tominaga, Eric K. Lin, Jian P. Gong, Paul D. Butler, Wen-Li Wu
A molecular mechanism is proposed for the toughness enhancement observed in double network (DN) hydrogels prepared from poly (2 acrylamido, 2-methyl, 1-propanesulfonicacid) (PAMPS) polyelectrolyte network and polyacrylamide (PAAm) linear polymer. It is an

Electron Trapping: An Unexpected Mechanism of NBTI and Its Implications

June 17, 2008
Author(s)
Jason P. Campbell, Kin P. Cheung, John S. Suehle, A Oates
We utilize fast-IdVg measurements to examine NBTI recovery over a time scale of 2usecs to 1000 seconds. The extracted DVTH and %GM degradation data clearly demonstrates the presence of hole as well as electron trapping and detrapping. The hole and electron

Surface Effects on the Elastic Modulus of Te Nanowires

June 17, 2008
Author(s)
Gheorghe Stan, Sergiy Krylyuk, Albert Davydov, Mark D. Vaudin, Leonid A. Bendersky, Robert F. Cook
Nondestructive elastic property measurements have been performed on Te nanowires with diameters in the range 20 150 nm. By using contact resonance atomic force microscopy, the elastic indentation modulus perpendicular to the prismatic facets of the

Flow Assurance in a Model Crude Oil: A Structural and Rheometric Study

June 16, 2008
Author(s)
E. Drabarek, Chris Muzny, G. Bryant, Howard J. Hanley
This report investigates how the technique of small angle neutron scattering (SANS) helps elucidate the phenomenon of wax deposition in a petroleum crude oil. Specifically, we report SANS data, supplemented by results from dynamic light scattering (DLS)

The Kirkwood-Buff Integrals for One-Component Liquids

June 16, 2008
Author(s)
Yedhud A. Ben-Naim
The Kirkwood-Buff integrals (KBIs) for one-component systems are calculated from either the pair correlation functions or from experimental macroscopic quantities. As in the case of mixtures, the KBIs provide important information on the local densities
Displaying 31226 - 31250 of 74260
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