Kostina, Victoria Tuncel, Ertem

In successive refinement of information, the decoder refines its representation of the source progressively as it receives more encoded bits. The rate-distortion region of successive refinement describes the minimum rates required to attain the target distortions at each decoding stage. In this paper, we derive a parametric characterization of the ...

Li, Zhongxi Lizana, Ricardo Yu, Zhujun Sha, Sha Peterchev, Angel V. Goetz, Stefan M.

When providing ac output, modular multilevel converters (MMCs) experience power fluctuation in the phase arms. The power fluctuation causes voltage ripple on the module capacitors, which grows with the output power and inversely to the output frequency. Thus, low-frequency operations of MMCs, e.g., for motor drives, require injecting common-mode vo...

Hutzler, Nicholas R.

We examine the χ^2 test for binned, Gaussian samples, including effects due to the fact that the experimentally available sample standard deviation and the unavailable true standard deviation have different statistical properties. For data formed by binning Gaussian samples with bin size n, we find that the expected value and standard deviation of ...

Shapiro, Charles Smith, Roger Huff, Eric Plazas, Andrés A. Rhodes, Jason Fucik, Jason Goodsall, Tim Massey, Richard Rowe, Barnaby Seshadri, Suresh
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As astronomical observations from space benefit from improved sensitivity, the effectiveness of scientific programs is becoming limited by systematics that often originate in poorly understood image sensor behavior. Traditional, bottom-up detector characterization methods provide one way to model underlying detector physics and generate ever more f...

Bell, Taylor J. Zhang, Michael Cubillos, Patricio E. Dang, Lisa Fossati, Luca Todorov, Kamen O. Cowan, Nicolas B. Deming, Drake Zellem, Robert T. Stevenson, Kevin B.
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The exoplanet WASP-12b is the prototype for the emerging class of ultrahot, Jupiter-mass exoplanets. Past models have predicted – and near-ultraviolet observations have shown – that this planet is losing mass. We present an analysis of two sets of 3.6 and 4.5 μm Spitzer phase curve observations of the system which show clear evidence of infrared ra...

Kumar, Sourabh Lauk, Nikolai Simon, Christoph

We design a quantum repeater architecture, necessary for long distance quantum networks, using the recently proposed microwave cat state qubits, formed and manipulated via interaction between a superconducting nonlinear element and a microwave cavity. These qubits are especially attractive for repeaters because in addition to serving as excellent c...

Zhou, G. Fulton, B. J.

Wide-field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between the properties of planets and their parent stars. We report the discovery of HAT-P-69 b (TOI 625.01) and HAT-P-70 b (TOI 624.01), two new hot Jupiters around A stars from the Hungarian-made Automate...

Austin, Tim Burton, Peter

Let G be a countable discrete sofic group. We define a concept of uniform mixing for measure-preserving G-actions and show that it implies completely positive sofic entropy. When G contains an element of infinite order, we use this to produce an uncountable family of pairwise nonisomorphic G-actions with completely positive sofic entropy. None of o...

Liu, Ke Zegard, Tomás Pratapa, Phanisri P. Paulino, Glaucio H.

Tensegrity structures resemble biological tissues: A structural system that holds an internal balance of prestress. Owing to the presence of prestress, biological tissues can dramatically change their properties, making tensegrity a promising platform for tunable and functional metamaterials. However, tensegrity metamaterials require harmony betwee...

Wang, Zi-Qiang Zhao, Qian Yu, Pan-Pan Yang, Jia-Miao Li, Yin-Mei Gong, Lei

We introduce a novel global optimization algorithm–bat algorithm (BA) for wavefront shaping to focus light through highly scattered media. Compared with the well-known genetic algorithm, BA-based binary wavefront shaping achieves a higher enhancement with less time in noisy environments, which is validated by simulation and experiment. Using a high...