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Displaying 1351 - 1375 of 2585

Time in Cyber-Physical Systems

October 2, 2016
Author(s)
Marc A. Weiss, Sundeep Chandhoke, Hugh Melvin
Time is central to predicting, measuring and controlling properties of the physical world, and is one of the most important constraints distinguishing Cyber-Physical Systems from distributed computing in general. However mixing the cyber and the physical

Time in Cyber-Physical Systems

October 2, 2016
Author(s)
Marc A. Weiss, YaShian Li-Baboud, Aviral Shrivastava, Mohammad Khayatian, Patricia Derlery, Hugo A. Andrade, Sundeep Chandhoke, Kevin Stanton, John Eidson
Many modern CPS, especially industrial automation systems, require the actions of multiple computational systems to be synchronized at much higher rates than is possible through ad hoc designs. Fundamental research is needed in synchronizing clocks of

Preparation of entangled states through Hilbert space engineering

September 28, 2016
Author(s)
Yiheng Lin, John P. Gaebler, Florentin Reiter, Ting R. Tan, Ryan S. Bowler, Yong Wan, Adam C. Keith, Emanuel Knill, Kevin Coakley, Dietrich Leibfried, David J. Wineland, Scott Glancy
Entangled states are a crucial resource for quantum-based technologies such as quantum computers and quantum communication systems. Exploring new methods for entanglement generation is important for diversifying and eventually improving current approaches

Exploring frustrated magnetism with artificial spin ice

September 26, 2016
Author(s)
Ian J. Gilbert, Bojan R. Ilic
Nanomagnet arrays known as artificial spin ice provide insight into the microscopic details of frustrated magnetism because, unlike natural frustrated magnets, the individual moments can be experimentally resolved and the lattice geometry can be easily

Nanoscale imaging of magnetization reversal driven by spin-orbit torque

September 23, 2016
Author(s)
Ian J. Gilbert, Andrew P. Chen, Daniel B. Gopman, Andrew L. Balk, Daniel T. Pierce, Mark D. Stiles, John Unguris
We use scanning electron microscopy with polarization analysis (SEMPA) to image deterministic, spin-orbit torque driven magnetization reversal of in-plane magnetized CoFeB rectangles in zero applied magnetic field. The spin-orbit torque is generated by

The Glass Transition of a Single Macromolecule

September 21, 2016
Author(s)
Jack F. Douglas, David Simmons, Weston L. Merling, Jack Mileski
The glass transition of a single macromolecule in isolation is relevant to the dynamics of systems including dilute solutions of synthetic polymers and biological macromolecules such as proteins. Here we employ molecular dynamics simulation to show that a

Film morphology evolution during solvent vapor annealing of highly efficient small molecule donor/acceptor blends

September 15, 2016
Author(s)
Sebastian Engmann, Hyun W. Ro, Andrew Herzing, Chad R. Snyder, Lee J. Richter, Paul Geraghty, David Jones
Solution-processable small molecule photovoltaics based on the novel molecular donor, benzodithiophene terthiophene rhodamine (BTR), recently have shown maximum power conversion efficiencies above 8% for active layer thicknesses up to 400 nm, using post

Conformational Nature of DNAGrafted Chains on Spherical Gold Nanoparticles

September 10, 2016
Author(s)
Jack F. Douglas, Fernando Vargas-Lara
We investigate the conformational state of a simple, coarse–grained molecular model for single–stranded DNA chains (ss-DNA) grafted onto spherical symmetric gold nanoparticles (NPs) and of the grafted layer as a whole by molecular dynamic simulations. In

Optically referenced broadband electronic synthesizer with 15 digits of resolution

September 5, 2016
Author(s)
Franklyn J. Quinlan, Tara M. Fortier, A. Rolland, Frederick N. Baynes, A. J. Metcalf, Archita Hati, Andrew D. Ludlow, Nathan M. Hinkley, M. Shimizu, Joe Campbell, Scott A. Diddams
Increasing demands in the high tech industry for higher data rates and better synchronization necessitates the development of new wideband and tunable sources with improved noise performance over traditional synthesis based quartz oscillators. Precision

Ultra-low-noise monolithic mode-locked solid-state laser

September 1, 2016
Author(s)
T D. Shoji, W Xie, Kevin L. Silverman, Ari Feldman, Todd E. Harvey, Richard Mirin, Thomas Schibli
Low-noise, high-repetition-rate mode-locked solid-state lasers are attractive for precision measurement and microwave generation, but the best lasers in terms of noise performance still consist of complex, bulky optical setups, which limits their range of

Point source atom interferometry with a cloud of finite size

August 19, 2016
Author(s)
Gregory W. Hoth, Bruno M. Pelle, Stefan Riedl, John E. Kitching, Elizabeth A. Donley
We demonstrate a two axis gyroscope by use of light pulse atom interferometry with an expanding cloud of atoms in the regime where the cloud has expanded by 1.1 to 5 times its initial size during the interrogation. Rotations are measured by analyzing

A comprehensive Doppler error budget for next generation, extreme precision spectrometers

August 9, 2016
Author(s)
Ryan C. Terrien, Samuel Halverson, Suvrath Mahadevan, Arpita Roy, Chad Bender, Guomundur K. Stefansson, Andrew Monson, Eric Levi, Fred Hearty, Cullen Blake, Michael McElwain, Christian Schwab, Lawrence Ramsey, Jason Wright, Sharon Wang, Qian Gong, Paul Robertson
We describe a detailed radial velocity error budget for the NASA-NSF Extreme Precision Doppler Spectrometer instrument concept NEID (NN-explore Exoplanet Investigations with Doppler spectroscopy). Such an instrument performance budget is a necessity for

Magnetic Random Access Memory

August 5, 2016
Author(s)
Michael L. Schneider, P. G. Mather
Magnetic Random Access Memory (MRAM) possesses a unique combination of attributes that provide considerable benefits over those available with conventional memory technology. Here we discuss the state-of-the-art of MRAM, from parts currently in production

Measuring extended red sensitivity in a 1.7mm-cutoff HgCdTe detector array

August 5, 2016
Author(s)
Ryan C. Terrien, Andrew J. Monson, Chad Bender, Samuel P. Halverson, Larry Ramsey
Infrared detectors with cutoff wavelengths of ∼ 1.7 μm have much lower sensitivity to thermal background contamination than those with longer cutoff wavelengths. This low sensitivity offers the attractive possibility of reducing the need for fully

High Fidelity Universal Gate Set for 9Be+ Ion Qubits

August 4, 2016
Author(s)
John P. Gaebler, Ting R. Tan, Yong Wan, Yiheng Lin, Ryan S. Bowler, Adam C. Keith, Scott Glancy, Kevin Coakley, Emanuel Knill, Dietrich Leibfried, David J. Wineland
We report high-fidelity laser-beam-induced quantum logic gates on qubits comprised of hyperfine states in 9Be+ ions, achieved in part through a combination of improved laser beam quality and control and improved state preparation. We demonstrate single

Miniature atomic scaler magnetometer for space based on the rubidium isotope 87 Rb

July 22, 2016
Author(s)
Haje Korth, Kim Strohbehn, Francisco Tejada, Andreas G Andreou, John Kitching, Svenja A. Knappe, S. John Lehtonen, Shaughn M. London, Matiwos Kafel
A miniature absolute scalar magnetometer based on the rubidium isotope 87Rb was developed for possible future operation in space. The instrument design implements both Mx and Mz mode operation and leverages a novel micro-electro-mechanical systems (MEMS)

Soliton crystals in Kerr microresonators

July 18, 2016
Author(s)
Daniel C. Cole, Erin S. Lamb, Pascal P. Del'Haye, Scott A. Diddams, Scott B. Papp
Solitons are pulses which propagate without spreading due to a balance between nonlinearity and dispersion or diffraction, and are universal features of systems exhibiting these effects. They are important in plasma physics, fluid dynamics, atomic physics
Displaying 1351 - 1375 of 2585
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