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Displaying 1326 - 1350 of 2585

Communication-Comparison of Nanoscale Focused Ion Beam and Electrochemical Lithiation in beta-Sn Microspheres

December 5, 2016
Author(s)
Saya Takeuchi, William R. McGehee, Jennifer L. Schaefer, Truman M. Wilson, Kevin A. Twedt, Christopher L. Soles, Vladimir P. Oleshko, Eddie H. Chang, Jabez J. McClelland
The development of Li focused ion beams (Li-FIB) enables controlled Li ion insertion into materials with nanoscale resolution. We take the first step toward establishing the relevance of the Li-FIB for studies of ion dynamics in electrochemically active

Coordinated Universal Time and the Leap Second

December 1, 2016
Author(s)
Judah Levine
I will discuss the considerations that were important in the design of the current version of Coordinated Universal Time. The design includes the addition of additional “leap” seconds to keep Coordinated Universal time within 0.9 s of the UT1 time scale

The sixth spectrum of platinum (Pt VI)

November 25, 2016
Author(s)
Vladimir I. Azarov, R R. Gayasov
The spectrum of platinum was observed in the (300 to 2100) A wavelength region. The (5d5 + 5d46s) - 5d46p transition array of five times ionized platinum, Pt VI, has been investigated and 1390 spectral lines have been classified in the region of (399 to

VECSEL systems for generation and manipulation of trapped magnesium ions

November 8, 2016
Author(s)
Shaun C. Burd, David T. Allcock, Tomi Leinonen, Jussi-Pekka Penttinen, Daniel H. Slichter, Raghavendra Srinivas, Andrew C. Wilson, Robert Jordens, Micrea Guina, Dietrich G. Leibfried, David J. Wineland
Experiments in atomic, molecular, and optical (AMO) physics rely on lasers at many different wave- lengths and with varying requirements on spectral linewidth, power and intensity stability. Vertical external-cavity surface-emitting lasers (VECSELs), when

Calibration of Effective Tunneling Bandgap in GaAsSb/InGaAs for improved TFET Performance Prediction

November 3, 2016
Author(s)
Quentin Smets, Anne S. Verhulst, Salim El Kazzi, David J. Gundlach, Curt A. Richter, Anda Mocuta, Nadine Collaert, Aaron Thean, Marc Heyns
The effective bandgap for heterojunction band-to-band tunneling (Eg,eff) is a crucial design parameter for heterojunction TFET. However, there is significant uncertainty on Eg,eff, especially for In0.53Ga0.47As/GaAs0.5Sb0.5. This makes TFET performance

Report for Dedicated JPSS VIIRS Ocean Color Calibration/Validation Cruise December 2015

October 30, 2016
Author(s)
Michael Ondrusek, Veronica P. Lance, Eric Stengel, Menghua Wang, Zhongping Lee, Jianwei Wei, Junfang Lin, Chuanmin Hu, Charles Kovach, David English, Jennifer Cannizzaro, Alex Gilerson, Sam Ahmed, Carlos Carrizo, Ahmed El-Habashi, Robert Foster, Matteo Ottaviani, Robert Arnone, Sherwin Ladner, Wesley Goode, Ryan Vandermeulen, Nicholas Tufillaro, Jasmine Nahorniak, Curtiss Davis, Joaquim I. Goes, Kali McKee, Scott Freeman, Joaquin E. Chaves Cedeno, Kenneth Voss, B. Carol Johnson

Revised and extended analysis of the eighth spectrum of platinum (Pt VIII)

October 27, 2016
Author(s)
Vladimir I. Azarov, R R. Gayasov
The spectrum of platinum was observed in the (300-2100) Å wavelength region. Grazing and normal incidence VUV spectrographs have been used to record the spectrum. The (5d3 + 5d26s) - 5d26p transition array of seven times ionized platinum, Pt VIII, has been

Gas Uptake of 3-D Printed Acrylonitrile Butadiene Styrene (ABS) Using a Vacuum Apparatus Designed for Absorption and Desorption Studies

October 25, 2016
Author(s)
Makfir Sefa, Zeeshan Ahmed, James A. Fedchak, Nikolai Klimov, Julia Scherschligt
We describe a vacuum apparatus for determining the outgassing rate into vacuum, the diffusion coefficient, and the amount of gas absorbed for various materials. The diffusion coefficient is determined from a model applied to time-dependent desorption data

Validating In-Air Remote Sensing Reflectance Measurements During Cruises Using Reflectance Targets

October 25, 2016
Author(s)
Bettye C. Johnson, Catherine C. Cooksey, Ahmed El-Habashi, David English, Georgi T. Georgiev, Sherwin Ladner, Veronica P. Lance, Michael Ondrusek, Ryan Vandermeulen
Annual dedicated ocean color validation cruises off the East Coast of the USA were started in November 2014 with support from the NOAA office of Marine and Air Operations with primary focus on VIIRS/SNPP and upcoming JPSS missions. A portion of the

Influence of Pressure on Glass Formation in a Simulated Polymer Melt

October 18, 2016
Author(s)
Jack F. Douglas, Wensheng Xu, Karl Freed
We investigate the thermodynamic and dynamic properties of a model unentangled glass-forming polymer melt over a wide range of pressures (P) and temperatures (T) using molecular dynamics simulation. We show that the T dependence of the reduced thermal

Magnetic microscopy and simulation of strain-mediated control of magnetization in Ni/PMN-PT nanostructures

October 17, 2016
Author(s)
Ian J. Gilbert, Andres C. Chavez, Daniel T. Pierce, John Unguris, Wei-Yang Sun, Cheng-Yen Liang, Gregory P. Carman
Strain-mediated thin film multiferroics comprising piezoelectric/ferromagnetic heterostructures enable the electrical manipulation of magnetization with much greater efficiency than other methods; however, the investigation of nanostructures fabricated

The PROSPECT Physics Program

October 17, 2016
Author(s)
Hans P. Mumm, Michael P. Mendenhall
The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is designed to make a precise measurement of the antineutrino spectrum from a highly-enriched uranium reactor and probe eV-scale sterile neutrinos by searching for neutrino oscillations

Supramolecular Self-assembly of a Novel Hydrogelator: Characterization of Fiber Morphology and Formation and Thermal-Reversible Gelation

October 8, 2016
Author(s)
Jack F. Douglas, Yuan Gao Yuan Gao, Ryan C. Nieuwendaal, Emilios Dimitriadis, Boualem Hammouda, Bing Xu, Ferenc Horkay
Hydrogels are of intense recent interest in connection with biomedical applications ranging from 3-D cell cultures and stem cell differentiation to regenerative medicine, controlled drug delivery and tissue engineering. This prototypical form of soft

Accurate, Traceable, and Verifiable Time Synchronization for World Financial Markets

October 7, 2016
Author(s)
Michael A. Lombardi, Andrew N. Novick, George Neville-Neil, Ben Cooke
This paper describes how the National Institute of Standards and Technology (NIST), through a collaboration with Perseus, is providing accurate, traceable, and verifiable time synchronization to stock exchanges in the United States, Europe, and Asia. The

A Thin-Film Cryotron Suitable For Use as an Ultra-Low-Temperature Switch

October 6, 2016
Author(s)
Peter J. Lowell, John A. Mates, William B. Doriese, Gene C. Hilton, Kelsey M. Morgan, Daniel S. Swetz, Joel N. Ullom, Daniel R. Schmidt
Low-temperature superconducting circuits have become important in modern science. However, there are presently no high-current-capacity switches with low power dissipation for sub-Kelvin operation. One candidate for a sub-Kelvin switch is the cryotron, a

Ionization potentials of superheavy elements No, Lr, and Rf and their ions

October 3, 2016
Author(s)
Vladimir A. Dzuba, M.S. Safronova, Ulyana I. Safronova, Alexander Kramida
We predict ionization potentials of superheavy elements No, Lr, and Rf and their ions using a relativistic hybrid method that combines con figuration interaction (CI) with the linearized coupled-cluster approach. Extensive study of the completeness of the
Displaying 1326 - 1350 of 2585
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