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Displaying 22476 - 22500 of 74202

Successive Phase Transitions and Extended Spin-Excitation Continuum in the S=1/2 Triangular-Lattice Antiferromagnet Ba 3 CoSb 2 ) 9

December 26, 2012
Author(s)
H. D. Zhou, Cenke Xu, A. M. Hallas, H. J. Silverstein, C. R. Wiebe, I. Umegaki, J. Q. Yan, T. P. Murphy, J.-H. Park, Yiming Qiu, John R. Copley, Jason S. Gardner, Y. Takano
Using magnetic, thermal and neutron measurements on single-crystal samples, we show that Ba 3CoSb 2O 9 is a spin-1/2 triangular-lattice antiferromagnet with easy-axis anisotropy and two magnetic phase transitions bracketing an intermediate up-up-down phase

The equilibrium states of open quantum systems in the strong coupling regime

December 26, 2012
Author(s)
Jacob M. Taylor, Yigit Subasi, Chris Fleming, Bei L. Hu
In this work we investigate the late-time stationary states of open quantum systems coupled to a thermal reservoir in the strong coupling regime. This is because in general such systems do not necessarily relax to a Boltzmann distribution if the coupling

High Resolution Length Fractionation of Surfactant Dispersed Carbon Nanotubes

December 23, 2012
Author(s)
Constantine Y. Khripin, Xiaomin X. Tu, Jeffrey A. Fagan, Ming Zheng
Length fractionation of colloidal carbon nanotube dispersions is required for many studies. Size- exclusion chromatography (SEC) has been reported as a reliable method for high resolution length fractionation of DNA-dispersed single-wall carbon nanotubes

Characterization of the US Construction Labor Supply

December 21, 2012
Author(s)
Stanley W. Gilbert
This study characterizes the construction labor pool, and carries out preliminary work toward an estimation of the supply and demand for construction labor. Specifically, it evaluates the composition of the construction labor force by race, age

Design of the permanent magnet system for NIST-4

December 21, 2012
Author(s)
Stephan Schlamminger
At the National Institute of Standards and Technology a new watt balance, NIST-4, is currently being designed. This apparatus will be used to realize the unit of mass after the redefinition of the SI has taken effect. In order to ensure smooth operation

NIST Handbook 150-11, NVLAP Electromagnetic Compatibility and Telecommunications

December 21, 2012
Author(s)
Bethany E. Hackett, Bradley Moore, Dennis G. Camell
NIST Handbook 150-11, NVLAP Electromagnetic Compatibility and Telecommunications, presents the technical requirements and guidance for the accreditation of laboratories under the NVLAP Electromagnetic Compatibility and Telecommunications (ECT) LAP. It is

NIST Micronutrients Measurement Quality Assurance Program Winter 2012 Comparability Studies Results for Round Robin LXXI Fat-Soluble Vitamins and Carotenoids in Human Serum and Round Robin 36 Ascorbic Acid in Human Serum

December 21, 2012
Author(s)
David L. Duewer, Jeanice M. Brown Thomas
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat- and water-soluble vitamins and carotenoids in human serum and plasma. This report describes

Optical-Fiber Power Meter Comparison between NIST and KRISS

December 21, 2012
Author(s)
Seungkwan Kim, Keesuk Hong, Dong-Hoon Lee, David J. Livigni, Xiaoyu X. Li, John H. Lehman
We describe the results of a comparison of reference standards between the National Institute of Standards and Technology (NIST-USA) and Korea Research Institute of Standards and Science (KRISS- R.O. Korea). We report optical fiber-based power measurements

Recommendation for Cryptographic Key Generation

December 21, 2012
Author(s)
Elaine B. Barker, Allen L. Roginsky
Cryptography is often used in an information technology security environment to protect data that is sensitive, has a high value, or is vulnerable to unauthorized disclosure or undetected modification during transmission or while in storage. Cryptography

Thermal and Burning Properties of Poly(lactic acid) Composites Using Cellulose-Based Intumescing Flame Retardants

December 21, 2012
Author(s)
Douglas M. Fox, Srilatha Temburni, Melissa Novy, Laura Flynn, Mauro Zammarano, Yeon S. Kim, Jeffrey W. Gilman, Rick D. Davis
Poly(lactic acid) was flame retarded using cellulose-based intumescing flame retardants. Cellulose was an excellent carbon source in combination with ammonium polyphosphate (APP), exhibiting good thermal stabilities and UL-94 ratings of V-0

Ultrafast element-specific magnetization dynamics of complex magnetic materials on a table-top

December 21, 2012
Author(s)
Justin M. Shaw, Stefan Mathias, Chan La-O=Vorakiat, Emrah Turgut, Patrik Grychtol, Roman Adam, Dennis Rudolf, Hans T. Nembach, Martin Aeschlimann, Claus Schneider, Henry Kapteyn, Margaret Murnane
We review recent progress in femtosecond magnetization dynamics probed by extreme ultraviolet pulses from high-harmonic generation. In a transversal magneto-optical Kerr geometry, we established an ultrafast, element-specific experimental capability – on a

Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top

December 21, 2012
Author(s)
Thomas J. Silva, Justin M. Shaw, Hans T. Nembach, Chan La-O-Vorakiat, Henry C. Kapteyn, Margaret M. Murnane, Stefan Mathias, Roman Adam, Patrik Grychtol, Martin Aeschlimann, Claus M. Schneider, Emrah Turgut, Dennis Rudolf
We review recent progress in femtosecond magnetization dynamics probed by extreme ultraviolet pulses from high-harmonic generation. In a transverse magneto-optical Kerr geometry, we establish an ultrafast, element-specific experimental capability - on a

Application of nanoporous silicon substrates for terahertz spectroscopy

December 20, 2012
Author(s)
Edwin J. Heilweil, Shu-Zee A. Lo, Gagan Kumar, Thomas E. Murphy
Infrared spectroscopy is a valuable tool for probing and characterizing the macro-molecular motions of complex molecules, including vibrational and phonon modes that cannot be easily accessed through visible spectroscopy. We describe here an improved

The Current State and Recent Trends of the U.S. Manufacturing Industry

December 20, 2012
Author(s)
Douglas Thomas
This report brings together multiple sources of aggregate manufacturing industry data and industry subsector data to develop a quantitative depiction of the U.S. manufacturing industry. It compares the U.S. manufacturing industry to its international

Beyond the Business Cycle: The Need for a Technology-Based Growth Strategy

December 19, 2012
Author(s)
Gregory C. Tassey
Facing the worst economic slowdown since the Great Depression, efforts to reestablish acceptable growth rates for the U.S. economy are relying almost entirely on short-term “stabilization” policies. However, the massive monetary and fiscal “stimulus”
Displaying 22476 - 22500 of 74202
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