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NIST Authors in Bold

Displaying 23576 - 23600 of 74165

Inelastic Neutron Scattering on Polymer Electrolytes for Lithium-Ion Batteries

May 7, 2012
Author(s)
Huagen H. Peng, Madhu Sudan Tyagi, Kirt A. Page, Christopher Soles
The relationship between ion transport and polymer dynamics is central to the pursuit of solid polymer electrolytes for lithium batteries. This understanding is critical to achieve solid polymer electrolyte systems of sufficiently high ion conductivities

Understanding Interfacial Structure of Proton Exchange Membrane Fuel Cells

May 7, 2012
Author(s)
Kirt A. Page, Sangcheol Kim, Christopher L. Soles
Although substantial improvements have been demonstrated for fuel cell technology over the past decade, the major technical challenges as associated with cost and durability should be overcome for fuel cells to compete in real markets and achieve wide

Extending single-photon optimized superconducting transition edge sensors beyond the single-photon counting regime

May 6, 2012
Author(s)
Thomas Gerrits, Brice R. Calkins, Nathan A. Tomlin, Adriana E. Lita, Alan L. Migdall, Richard P. Mirin, Sae Woo Nam
We illuminate a photon-number-resolving transition edge sensor with strong pulses of light containing up to 6.7 million photons (0.85 pJ per pulse). These bright pulses heat the sensor far beyond its transition edge into the normal resistance regime. We

On-chip, photon-number-resolving, telecom-band detectors for scalable photonic information processing

May 6, 2012
Author(s)
Thomas Gerrits, Nick Thomas-Peter, James Gates, Adriana E. Lita, Benjamin Metcalf, Brice R. Calkins, Nathan A. Tomlin, Anna E. Fox, Antia A. Lamas-Linares, Justin Spring, Nathan Langford, Richard P. Mirin, Peter Smith, Ian Walmsley, Sae Woo Nam
We demonstrate an integrated photon-number resolving detector, operating in the telecom band at 1550 nm, employing an evanescently coupled design that allows the detector to be placed at arbitrary locations within a planar optical circuit. Up to 5 photons

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
Displaying 23576 - 23600 of 74165
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