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Displaying 11501 - 11525 of 73751

Measuring the Leakage Current to Ground in Programmable Josephson Voltage Standards

July 7, 2018
Author(s)
Alain Rufenacht, Charles J. Burroughs, Paul Dresselhaus, Samuel P. Benz
The voltage error associated with the leakage current of programmable Josephson voltage standards (PJVS) is one of the largest contributions to the uncertainty in direct comparison of voltage standards. Due to the parallel biasing scheme of the PJVS and

Radiofrequency Waveform Synthesis with the Josephson Arbitrary Waveform Synthesizer

July 7, 2018
Author(s)
Justus Brevik, Christine A. Donnelly, Nathan Flowers-Jacobs, Anna Fox, Pete Hopkins, Paul Dresselhaus, Samuel P. Benz
We have measured the frequency-dependent voltage output up to 100 MHz of a modified version of the Josephson Arbitrary Waveform Synthesizer. An impedance-matching resistor was integrated within the Josephson junction array circuit to match the nominally

Three Volt Pulse-Driven Josephson Arbitrary Waveform Synthesizer

July 7, 2018
Author(s)
Nathan Flowers-Jacobs, Alain Rufenacht, Anna Fox, Steven B. Waltman, Justus Brevik, Paul Dresselhaus, Samuel P. Benz
This paper describes a new generation of Josephson Arbitrary Waveform Synthesizers which generate ac waveforms with a root-mean-squared (rms) amplitude of 3 V over a quantum-accurate operating range greater than 1 mA at 1 kHz. This system is composed of

Automated Direct Comparison of Two Cryocooled 10 Volt Programmable Josephson Voltage Standards

July 6, 2018
Author(s)
Alain Rufenacht, Yi-hua D. Tang, Stephane Solve, Anna E. Fox, Paul D. Dresselhaus, Charles J. Burroughs, Robert E. Schwall, Regis Chayramy, Samuel P. Benz
We have performed direct dc comparisons between two cryocooled 10 V programmable Josephson voltage standards utilizing an automated synchronization scheme for the voltage reversals, which enables the use of a high-sensitivity analog null detector on its 10

Commissioning the SALT High Resolution Spectrograph's Iodine Cell

July 6, 2018
Author(s)
Lisa A. Crause, R P. Butler, Gillian Nave, Rudi Kuhn, Blaine Lomberg, Alexei Kniazev, Steven M. Crawford, Eric Depagne
We report on commissioning the iodine absorption cell in the High Resolution Spectrograph (HRS) on the Southern African Large Telescope (SALT). The low-, medium- and high-resolution (LR, MR and HR) modes of this fibre-fed, dual-channel, white-pupil vacuum

Finding Bugs in Cryptographic Hash Function Implementations

July 6, 2018
Author(s)
Nicky W. Mouha, Mohammad Raunak, David R. Kuhn, Raghu N. Kacker
Cryptographic hash function implementations can be particularly difficult to test, and bugs can remain unnoticed for a very long time. We revisit the NIST SHA-3 hash function competition, and apply a new testing strategy to all available reference

Golden aspect ratio for ion transport simulation in nanopores

July 5, 2018
Author(s)
Subin Sahu, Michael P. Zwolak
Access resistance indicates how well current carriers from the bulk medium can converge to a pore or opening, and is important in many fields, such as cell biology, electronics, electrochemical engineering, thermal transport, among others. In simplified

Superconducting optoelectronic networks III: synaptic plasticity

July 5, 2018
Author(s)
Jeffrey M. Shainline, Adam N. McCaughan, Sonia M. Buckley, Christine A. Donnelly, Manuel C. Castellanos Beltran, Michael L. Schneider, Richard P. Mirin, Sae Woo Nam
As a means of dynamically reconfiguring the synaptic weight of a superconducting optoelectronic loop neuron, a superconducting flux storage loop is inductively coupled to the synaptic current bias of the neuron. A standard flux memory cell is used to

Universal Geometric Frustration in Pyrochlores

July 5, 2018
Author(s)
Benjamin A Trump, Syed M. Koohpayeh, Ken J. T. Livi, JiaJia Wen, Kathyrn Arpino, Quentin M. Ramasse, Rik Brydson, Mikhail Feygenson, H. Takeda, M. Takigawa, K. Kimura, S. Nakatsuji, Collin L. Broholm, T. M. McQueen
We report on the structural details of Pr 2Zr 2O 6O', La 2Zr 2O 6O', and Yb 2Ti 2O 6O' in the A 2B 2O 6O' pyrochlore structure. X-ray and neutron powder diffraction indicate these materials are long-range ordered. On the local scale these materials appear

Walk-through Metal Detector Testing and the Need to Emulate Natural Body Motion

July 5, 2018
Author(s)
Nicholas G. Paulter Jr., Donald R. Larson, Nicklaus F. Troje
The effect of motion through the portal of a walk-through metal detector (WTMD) has often been considered to contribute to the uncertainty in detecting threat objects being carried through the WTMD. However, typical metrological testing uses a robotic

Electric-field control of perpendicular magnetic anisotropy in multiferroic PZT- and PMN- PT//[Co/Ni] composites with negative magnetostriction

July 4, 2018
Author(s)
Daniel B. Gopman, Andrew P. Chen, Cindi L. Dennis, June W. Lau, Robert D. Shull, Gregory P. Carman, Peter Finkel, Margo Staruch, Andres Chavez
A longstanding goal of spintronics is to identify alternatives to current-generated Oersted- fields for magnetization control at the nanoscale. An emerging approach seeks to harness the voltage-induced strain in a proximal piezostrictive layer to modify

Creating a Mass Spectral Reference Library for Oligosaccharides in Milk

July 3, 2018
Author(s)
Concepcion A. Remoroza, Tytus D. Mak, M. L. De Leoz, Yuri A. Mirokhin, Stephen E. Stein
We report the development and availability of a mass spectral reference library for oligosaccharides in human milk. This represents a new variety of spectral library that includes consensus spectra of compounds annotated through various data analysis

Local Quantum Phase Transition in YFe 2 Al^d10

July 3, 2018
Author(s)
W. J. Gannon, L. S. Wu, I. A. Zaliznyak, W. H. Xu, A. M. Tsvelik, Yiming Qiu, Jose Rodriguez Rivera, M. C. Aronson
A phase transition occurs when correlated regions of a new phase grow to span the system and the fluctuations within the correlated regions become long-lived. Here we present neutron scattering measurements showing that this conventional picture must be

Spin-Phonon Couplings in Transition Metal Complexes with Slow Magnetic Relaxation

July 3, 2018
Author(s)
Duncan H. Moseley, Shelby E. Stavretis, Komalavalli Thirunavukkuarasu, Mykhaylo Ozerov, Yongqiang Cheng, Luke L. Daemen, Jonathan Ludwig, Zhengguang Lu, Dmitry Smirnov, Craig Brown, Anup Pandey, A. J. Ramirez-Cuesta, Adam C. Lamb, Mihail Atanasov, Eckhard Bill, Frank Neese, Zi-Ling Xue
Co(acac) 2(H 2O) 2 (1, acac = acetylacetonate), a model transition metal complex, displays field-induced slow magnetic relaxation as a single-molecule magnet. Raman spectra of 1, Co(acac) 2(D 2O) 2 (1-d 4 and Co(acac-d 7) 2(D 2O 2) 2 (1-d 18) reveal that

Scheduling Policies in Flexible Bernoulli Lines with Dedicated Finite Buffers

July 2, 2018
Author(s)
Shaw C. Feng, Yuan Feng, Xiang Zhong, Wenhui Fan, Jingshan Li
This paper is devoted to studying scheduling policies in flexible serial lines with two Bernoulli machines and dedicated finite buffers. Priority, cyclic and work-in-process (WIP)-based scheduling policies are investigated. For small scale systems, exact

Characterization of Circulating Steroid Hormone Profiles in the Bottlenose Dolphin (Tursiops truncatus) by Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

July 1, 2018
Author(s)
Thomas M. Galligan, Lori Schwacke, Dorian S. Houser, Randall Wells, Teresa Rowles, Ashley Russell
Circulating steroid hormone concentrations are typically measured by immunoassays, which have imperfect specificity and are limited to the measurement of a single hormone per assay. Here we demonstrate that reverse phase solid phase extraction (SPE)
Displaying 11501 - 11525 of 73751
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