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Displaying 27526 - 27550 of 73832

Ultrafast Demagnetization Dynamics at the M Edges of Magnetic Elements Observed Using a Tabletop High-Harmonic Soft X-Ray Source

December 15, 2009
Author(s)
Thomas J. Silva, Justin Shaw, Hans Nembach, Chan La-O-Vorakiat, Mark Siemens, Margaret M. Murnane, Henry C. Kapteyn, Stefan Mathias, Martin Aeschlimann, Patrik Grychtol, Roman Adam, Claus M. Schneider
We use few-femtosecond soft x-ray pulses from high-harmonic generation to extract element-specific demagnetization dynamics and hysteresis loops of a compound material for the first time. Using a geometry where high-harmonic beams are reflected from a

A Structural Approach to the Temporal Modeling of Networks

December 14, 2009
Author(s)
Brian D. Cloteaux, Isabel M. Beichl
Simulation of many dynamic real world systems such as the Internet and social networks requires developing dynamic models for the underlying networks in these systems. Currently, there is a large body of work devoted towards determining the underlying

Marketplace Assessment - Metric Labeling on Packages in Retail Stores

December 14, 2009
Author(s)
Elizabeth J. Benham
Use of metric labeling on United States consumer products has a long history. Currently, the Fair Packaging and Labeling Act (FPLA) requires dual unit labeling, while products regulated by states under the Uniform Packaging and Labeling Regulation (UPLR)

Quantum information processing and quantum control with trapped atomic ions

December 14, 2009
Author(s)
David J. Wineland
The role of trapped atomic ions in the field of quantum information processing is briefly reviewed. We discuss some of the historical developments that enabled ions to enter the field and then summarize the basic mechanisms required for logic gates and the

ThermoML an XML-based Approach for Storage and Exchange of Experimental and Critically Evaluated Thermophysical and Thermochemical Property Data. 4. Biomaterials

December 12, 2009
Author(s)
Robert D. Chirico, Michael D. Frenkel, Vladimir Diky, Robert N. Goldberg, Heiko Heerklotz, John E. Ladbury, David P. Remeta, John H. Dymond, Anthony R. Goodwin, Kenneth N. Marsh, William A. Wakeham
ThermoML is an XML-based approach for storage and exchange of experimental and critically evaluated thermophysical and thermochemical property data. Extensions to the ThermoML schema for the representation of properties of biomaterials are described. The

EXAFS Studies of Catalytic DNA Sensors for Mercury Contamination of Water

December 11, 2009
Author(s)
Bruce D. Ravel, S.C. Slimmer, X. Meng, G.C.L. Wong, Y. Lu
Monitoring of metallic contaminants in domestic and agricultural water systems systems requires technology that is fast, flexible, sensitive, and selective. Recently, metal sensors based on catalytic DNA have been demonstrated as a practical monitoring

Interlaboratory Study of Alternate Filter Papers for Use in ASTM E 2187

December 11, 2009
Author(s)
Richard G. Gann, William F. Guthrie
ASTM E 2187 has become the internationally referenced standard for designing and specifying less fire-prone cigarettes. In this test method, a lit cigarette is laid on multiple layers of filter paper, and the observer identifies whether the cigarette burns

MEMS Parallel Plate Rheometer for Oscillatory Shear Micro Rheology Measurements

December 11, 2009
Author(s)
Gordon Christopher, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Growing numbers of applications including proteomics, cosmetics, and thin film coatings use novel viscoelastic materials that derive their rheological properties from micro scale structure created by the inclusion of long chain molecules, nano particles

Compensation of Field-Induced Frequency Shifts in Ramsey Spectroscopy of Optical Clock Transitions

December 10, 2009
Author(s)
A. V. Taichenachev, V. I. Yudin, Christopher W. Oates, Barber W. Zeb, Nathan D. Lemke, Andrew Ludlow, U Sterr, Ch. Lisdat, F Reihle
We develop a modified version of Ramsey spectroscopy that uses an additional frequency shift to compensate frequency shifts induced by the excitation itself. In its simplest realization, this method uses a small step of the probe frequency during the two

Oersted Field Induced Magnetization Scissoring In Permalloy Bars

December 10, 2009
Author(s)
Lu Yuan, Fabio C. da Silva, Sean Halloran, Hamid Z. Fardi, David P. Pappas
We have systematically studied the magnetization behavior induced by the applied current in the permalloy (Ni81Fe19) bars using second and third harmonic analysis. Three types of sample were studied with layer structures of Al30/NiFe10, NiFe5/Al30/NiFe5

CT Assessment of Response to Therapy: Tumor Volume Change Measurement, Truth Data & Error

December 9, 2009
Author(s)
Charles D. Fenimore, Michael McNitt-Gray, Luc Bidaut, Samuel G. Armato, Charles R. Meyer, Marios A. Gavrielides, Geoffrey McLennan, Nicholas Petrick, Binsheng Zhao, Anthony P. Reeves, Reinhard R. Beichel, Grace Kim
Rationale and Objectives: This manuscript describes issues and methods that are specific to the measurement of change in tumor volume as measured from CT images and how these would relate to the establishment of CT tumor volumetrics as a biomarker of

Evaluation of the state-of-the-art measurement capabilities for selected PBDEs and decaBB in plastic by the international intercomparison CCQM-P114

December 9, 2009
Author(s)
Michele M. Schantz, Katrice A. Lippa, R. Zeleny, S. Voorspoels, M. Ricci, Dorit Becker, M. Sittidech, A.M.F. Wong, D.H. Kim, S. Mingwu, S. Matsuyama
An international intercomparison involving eight National Metrology Institutes (NMIs) was conducted to establish their current measurement capabilities for determining five selected congeners from the brominated flame retardant classes polybrominated

Organohalogen contaminants in blood of Kemp's ridley (Lepidochelys kempii) and green sea turtles (Chelonia mydas) from the Gulf of Mexico

December 9, 2009
Author(s)
Robert R. Swarthout, Jennifer Lynch, Margie Peden-Adams, Andre Landry, Patricia Fair, John Kucklick
The threat that exposure to organohalogen (OH) contaminants poses to endangered populations of Kemp's ridley (Lepidochelys kempii) and green sea turtles (Chelonia mydas) is not well understood, partly because few OH data are available. Blood samples from
Displaying 27526 - 27550 of 73832
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