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Displaying 16751 - 16775 of 74075

High-resolution X-ray emission spectroscopy with transition-edge sensors: present performance and future potential

May 1, 2015
Author(s)
W.Bertrand (Randy) Doriese, Joseph Fowler, Daniel Swetz, Cherno Jaye, Daniel A. Fischer, Carl D. Reintsema, Douglas Bennett, Leila R. Vale, Gene C. Hilton, Dan Schmidt, Joel Ullom, Jens Uhlig, Ujjwal Mandal, Galen O'Neil, Luis Miaja Avila, Young I. Joe, wilfrid fullagar, Fredrick P. Gustafsson, Dharma Kurunthu, Villy Sundstrom
X-ray emission spectroscopy (XES) is a powerful element-selective tool to analyze the oxidation states of atoms in complex compounds, determine their electronic configuration, and identify unknown compounds in challenging environments. Until now the low

Introduction to the Special Issue

May 1, 2015
Author(s)
Thomas M. Wallis, Goutam Chattopadhyay, Fabio Cocetti, Luca Pierantoni
In the inaugural editorial of these IEEE Transactions on Terahertz Science and Technology – September 2011, the editor-in-chief anticipated that the work published in this journal would push beyond topics that are familiar to the traditional RF and

Millimeter-Wave Modulated-Signal and Error-Vector-Magnitude Measurement With Uncertainty

May 1, 2015
Author(s)
Catherine A. Remley, Dylan F. Williams, Paul D. Hale, Chih-Ming Wang, Jeffrey A. Jargon, Youngcheol Park
We provide techniques to generate and characterize precision wideband millimeter-wave modulated signals. We use predistortion to obtain a significant improvement in signal quality and an associated reduction in the error vector magnitude (EVM) of the

Superexchange mediated magnetization dynamics in a 2D checkerboard optical lattice

May 1, 2015
Author(s)
Elizabeth A. Goldschmidt, Roger C. Brown, Silvio B. Koller, Michael S. Foss-Feig, James V. Porto, Robert Wyllie
The interplay of spin and motion underlies some of the most intriguing and poorly understood behaviors in many-body quantum systems. A well known example is the onset of superconductivity in cuprate compounds when mobile holes are introduced into an

Tap On, Tap Off: Onscreen Keyboards and Mobile Password Entry

May 1, 2015
Author(s)
Kristen Greene, Joshua M. Franklin, John M. Kelsey
Password entry on mobile devices significantly impacts both usability and security, but there is a dearth of usable security research in this area, specifically for complex password entry. To address this research gap, we set out to assign strength metrics

Terbium-Doped Magnetite Nanocrystals for Multimodal Imaging Agents

May 1, 2015
Author(s)
Katherine P. Rice, Stephen E. Russek, Roy H. Geiss, Justin M. Shaw, Robert J. Usselman, Eric R. Evarts, Thomas J. Silva, Hans T. Nembach, Elke Arenholz, Yves Idzerda
High quality cubic Tb-doped magnetite nanocrystals have been fabricated and have shown that the Tb is incorporated into the octahedral 3+ sites. Magnetization and FMR data indicate that the Tb spins are weakly coupled to the iron spin lattice at room

Two determinations of the 223Ra half-life

May 1, 2015
Author(s)
Denis E. Bergeron, Ryan P. Fitzgerald
Ra-223 is an alpha-emitter that is being used as a bone-seeking radiotherapeutic agent. The relatively large uncertainty on its half-life (0.26 %, Bé et al., 2011) is an impediment to precision activity assays. We have performed two series of measurements

A Compact Millimeter-wave Multisine Generator for Calibrating Broadband Vector Receivers

April 30, 2015
Author(s)
Paul D. Hale, Kate Remley, Dylan Williams, Jeffrey Jargon, Chih-Ming Wang
We propose a compact and low cost waveform source that can be used to calibrate the magnitude and phase response of vector receivers over a bandwidth as large as a few gigahertz. The generator consists of a broadband comb generator followed by a filter and
Displaying 16751 - 16775 of 74075