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Displaying 23176 - 23200 of 73741

Overview of Recent Atomic Spectroscopy At The NIST EBIT

May 5, 2012
Author(s)
John Gillaspy
Seven papers published by the NIST EBIT spectroscopy team and collaborators from mid-2009 to mid-2011 are summarized. Previous discussions of the D-lines in Na-like ions and the Lyman-alpha lines in H-like ions are updated with new information. Nine issues

Computational Seebeck Coefficient Measurement Simulations

May 2, 2012
Author(s)
Joshua B. Martin
We have employed finite element analysis to develop computational Seebeck coefficient metrology simulations. This approach enables a unique exploration of multiple probe arrangements and measurement techniques within the same temporal domain. To

A diffuse-interface Model of Reactive Wetting with Intermetallic Formation

May 1, 2012
Author(s)
Walter Villaneuva, William J. Boettinger, Geoffrey B. McFadden, James A. Warren
A diffuse-interface model of reactive wetting with intermetallic formation is developed that incorporates fluid flow, phase change, and solute diffusion. The model is based on the total molar Gibbs energy of a ternary system with four phases. Numerical

A two-fluid model for the transition shape in transition-edge sensors

May 1, 2012
Author(s)
Douglas A. Bennett, Daniel S. Swetz, Robert D. Horansky, Daniel R. Schmidt, Joel N. Ullom
Superconducting microcalorimeters based on transition-edge sensors (TESs) are being successfully used in applications ranging from optical photon counting to gamma-ray and alpha particle spectroscopy. Practical instruments often require a complex

Comb-assisted swept laser spectroscopy with a mode-hop free tunable external cavity QCL

May 1, 2012
Author(s)
Kevin O. Knabe, Fabrizio R. Giorgetta, Nathan R. Newbury, Chris Armacost, Michael Radunsky, Sam Crivello, Timothy Day, Paul A. Williams
We demonstrate sub-MHz spectral resolution of N 2O absorption spectra acquired with a swept external-cavity quantum cascade laser (QCL) over 0.87 THz. The QCL frequency is monitored by sum -frequency generation with an optical fiber frequency comb.

Concrete rheometers

May 1, 2012
Author(s)
Chiara F. Ferraris, Nicos Martys
The scope of this chapter is to introduce the current technology for measuring the rheological properties of concrete. The need to evaluate or assess the flow properties of concrete has resulted in the invention or design and standardization of hundreds of

Exchange Coupling in Magnetic Semiconductor Multilayers and Superlattices

May 1, 2012
Author(s)
J. K. Furdyna, J. Leiner, X. Liu, M. Dobrowolska, S. Lee, J.-H. Chung, Brian Kirby
The study of ferromagnetic semiconductors (FMSs) continues to be of great interest because of their potential for spintronic devices. While there has been much progress in our understanding of FMS materials ¿ particularly of the canonical III-V system Ga(1

Extended Lee model for the turbine meter & calibrations with surrogate fluids

May 1, 2012
Author(s)
Jodie G. Pope, John D. Wright, Aaron N. Johnson, Michael R. Moldover
We developed a physical model termed the “extended Lee model” for calibrating turbine meters to account for 1) fluid drag on the rotor, 2) bearing static drag and 3) bearing viscous drag. We tested the extended Lee model using a dual rotor, 2.5 cm diameter

Gas-Foamed Scaffold Gradients for Combinatorial Screening in 3D

May 1, 2012
Author(s)
Carl G. Simon Jr., Kaushik Chatterjee, Alison M. Kraigsley, Joachim Kohn, Durgadas Bolikal
Current methods for screening cell-material interactions typically utilize two-dimensional (2D) culture format where cells are cultured on flat surfaces. However, there is a need for combinatorial and high-throughput screening methods to systematically

In Situ Neutron Techniques for Studying Lithium Ion Batteries

May 1, 2012
Author(s)
Howard Wang, Robert Gregory Downing, Joseph Dura, Daniel S. Hussey
We review in situ neutron techniques for studying lithium ion batteries. Four neutron measurement techniques, neutron depth profiling (NDP), neutron reflectivity (NR), small angle neutron scattering (SANS), and neutron imaging (NI) are discussed in this
Displaying 23176 - 23200 of 73741
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