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DC Comparison of a Programmable Josephson Voltage Standard and a Josephson Arbitrary Waveform Synthesizer

July 7, 2018

Author(s)

Alain Rufenacht, Nathan Flowers-Jacobs, Anna Fox, Steven B. Waltman, Robert E. Schwall, Paul Dresselhaus, Samuel P. Benz, Charles J. Burroughs

We present the first dc comparison of a programmable Josephson voltage standards and a pulse- driven Josephson arbitrary waveform synthesizer (JAWS) at 3 V. Both devices are mounted side- by-side on the cold stage of a cryocooler. The relative agreement

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

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

Through-focus optical imaging methods: a review

July 6, 2018

Author(s)

Ravikiran Attota

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

Nanoscale 3D Shape Process Monitoring Using TSOM

June 24, 2018

Author(s)

Ravikiran Attota

Uniform Angular Illumination in Optical Microscopes

June 24, 2018

Author(s)

Ravikiran Attota, Emil Agocs

Combining viscoelastic properties and architecture to control the dynamic response of soft materials

June 4, 2018

Author(s)

Aaron M. Forster, Michael A. Riley

Blunt trauma and brain injury can occur during impacts at energies and velocities below those observed in ballistic and blast events. During low to medium velocity impacts, the shell prevents helps to prevent bone fractures and the padding helps limit the

Calibration of a Single-Diode Performance Model without a Short-Circuit Temperature Coefficient

May 30, 2018

Author(s)

Mark Campanelli, Behrang Hamadani

We calibrate (i.e., fit the parameters of) a seven-parameter single-diode model (SDM) for photovoltaic device performance using current-voltage (I-V) curves measured under controlled laboratory conditions over a matrix of temperature and nominal irradiance

Through-focus Scanning Optical Microscopy Applications

May 24, 2018

Author(s)

Ravikiran Attota

Towards Light Storage and Retrieval from a Solid-State Atomic Ensemble at the Single-Photon Level

May 13, 2018

Author(s)

Kumel H. Kagalwala, Elizabeth A. Goldschmidt, Sergey V. Polyakov, Alan L. Migdall

We report progress towards the implementation of a quantum memory in a rare-earth ion-doped crystal. Toward that goal, we demonstrate a narrowband spectral filter for our memory, and measure the optical correlations.

'Software Science' revisited: rationalizing Halstead's system using dimensionless units

May 9, 2018

Author(s)

David W. Flater

The set of software metrics introduced by Maurice H. Halstead in the 1970's has seen much scrutiny and not infrequent criticism. This article takes a fresh look at these metrics using quantity calculus (the algebra of units) and a new approach to

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