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Displaying 49751 - 49775 of 143806

Effect of Component Geometry on Flow Nonuniformities in a Large Pulse Tube Cryocooler

May 17, 2010
Author(s)
Michael A. Lewis, Ryan P. Taylor, Ray Radebaugh, Peter E. Bradley
A single-stage pulse tube cryocooler was designed to achieve 50 W of refrigeration power at 50 K when driven by a pressure oscillator that can produce up to 2.8 kW of acoustic power at 60 Hz. Initial experimental data produced no-load temperatures that

Fast Quantum Algorithms for Traversing Paths of Eigenstates

May 17, 2010
Author(s)
S. Boixo, Emanuel Knill, Rolando Somma
Consider a path of non-degenerate eigenstates |psi_s>, 0 Solutions to this problem have applications ranging from quantum physics simulation to optimization. For Hamiltonians, the conventional way of doing this is by applying the adiabatic theorem. We give

GRADED STRUCTURES FOR ALL-CERAMIC RESTORATIONS

May 17, 2010
Author(s)
Yu Zhang, H Chai, Brian R. Lawn
One failure mode of all-ceramic crown restorations is radial cracking at the cementation surface, from occlusally-induced flexure of the stiffer crown layer on the softer dentin underlayer. We hypothesize that such failure may be substantially mitigated by

INVESTIGATING WIND DRIVEN FIREBRAND PENETRATION INTO BUILDING VENTS

May 17, 2010
Author(s)
Samuel L. Manzello, Sayaka S. Suzuki, Yoshihiko Hayashi
Evidence suggests that wind driven firebrand showers are responsible for a majority of structure ignitions in Wildland-Urban Interface (WUI) fires in the USA and urban fires in Japan. This study is aimed at extensively quantifying firebrand penetration

Simultaneous XAFS Measurements of Multiple Samples

May 17, 2010
Author(s)
Bruce D. Ravel, C. Scorzato, D. P. Siddons, S. D. Kelly, S. R. Bare
A four-channel ionization chamber has been designed, constructed and tested. This ionization chamber allows X-ray absorption spectra to be collected in transmission from up to four samples simultaneously. This results in spectra that are free of systematic

Study of Proposed Internet Congestion-Control Mechanisms

May 17, 2010
Author(s)
Kevin L. Mills, James J. Filliben, Dong Y. Cho, Edward J. Schwartz, Daniel I. Genin
This study describes a coherent set of modeling and analysis methods to investigate the behavior of large distributed systems. The methods are applied to compare several proposed Internet congestion-control mechanisms operating under a wide range of

An Ultra-Stable Platform for the Study of Single-Atom Chains

May 16, 2010
Author(s)
Douglas T. Smith, Jon R. Pratt, Francesca M. Tavazza, Lyle E. Levine, Anne M. Chaka
We describe a surface probe instrument capable of sustaining single-atomic-bond junctions in the electronic quantum-conduction regime for tens of minutes, and present results for Au junctions that can be locked stably in n = 1 and n = 2 quantum conduction

Critical Constants of Organic Compounds

May 16, 2010
Author(s)
Chris D. Muzny, Vladimir Diky, Andrei F. Kazakov, Robert D. Chirico, Michael D. Frenkel
The parameters of the liquid-gas critical point are important constants in determining the behavior of fluids. This table lists the critical temperature, pressure, and molar volume, as well as the normal boiling point, for over 850 organic substances. The

Mid-IR frequency comb upconversion spectroscopy

May 16, 2010
Author(s)
Todd Johnson, Scott A. Diddams
We present a mid-infrared frequency comb generated via differency frequency mixing of a Yb femtosecond fiber laser. After passing through a methane gas sample, the MIR comb is upconverted and dispersed onto a CCD for detection.

Preserving quantum coherence using optimized open-loop control techniques

May 16, 2010
Author(s)
Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M. Itano, John J. Bollinger
We describe experimental and theoretical studies of open-loop quantum control techniques known as dynamical decoupling (DD) for the suppression of decoherence-induced errors in quantum systems. Our experiments on trapped atomic ion qubits demonstrate that
Displaying 49751 - 49775 of 143806
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