Resolution-Adaptive All-Digital Spatial Equalization for mmWave Massive MU-MIMO

Posted by dbos Cornell

Kavli Affiliate: Alyosha Molnar | First 5 Authors: Oscar Castañeda, Seyed Hadi Mirfarshbafan, Shahaboddin Ghajari, Alyosha Molnar, Sven Jacobsson | Summary: All-digital basestation (BS) architectures for millimeter-wave (mmWave) massive multi-user multiple-input multiple-output (MU-MIMO), which equip each radio-frequency chain with dedicated data converters, have advantages in spectral efficiency, flexibility, and baseband-processing simplicity over hybrid analog-digital solutions. […]


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Inhibited nonradiative decay at all exciton densities in monolayer semiconductors

Posted by klaurent Berkeley

Kavli Affiliate: Ali Javey | Summary:Most optoelectronic devices operate at high photocarrier densities, where all semiconductors suffer from enhanced nonradiative recombination. Nonradiative processes proportionately reduce photoluminescence (PL) quantum yield (QY), a performance metric that directly dictates the maximum device efficiency. Although transition-metal dichalcogenide (TMDC) monolayers exhibit near-unity PL QY at low exciton densities, nonradiative exciton-exciton […]


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Inhibited nonradiative decay at all exciton densities in monolayer semiconductors

Posted by klaurent Berkeley

Kavli Affiliate: Ali Javey | First 5 Authors: Hyungjin Kim, Shiekh Zia Uddin, Naoki Higashitarumizu, Eran Rabani, Ali Javey | Summary: Most optoelectronic devices operate at high photocarrier densities, where all semiconductors suffer from enhanced nonradiative recombination. Nonradiative processes proportionately reduce photoluminescence (PL) quantum yield (QY), a performance metric that directly dictates the maximum device […]


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Thermodynamics of light management in near-field thermophotovoltaics

Posted by klaurent Berkeley

Kavli Affiliate: Eli Yablonovitch | Summary:We evaluate near-field thermophotovoltaic (TPV) energy conversion systems focusing in particular on their open-circuit voltage (Voc). Unlike previous analyses based largely on numerical simulations with fluctuational electrodynamics, here, we develop an analytic model that captures the physics of near-field TPV systems and can predict their performance metrics. Using our model, […]


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Smallest Remnants of Early Matter Domination

Posted by klaurent Chicago

Kavli Affiliate: Albert Stebbins | First 5 Authors: Gabriela Barenboim, Nikita Blinov, Albert Stebbins, , | Summary: The evolution of the universe prior to Big Bang Nucleosynthesis could have gone through a phase of early matter domination (EMD) which enhanced the growth of small-scale dark matter structure. If EMD was long enough, self-gravitating objects formed […]


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UV Fluorescence Traces Gas and LyA Evolution in Protoplanetary Disks

Posted by klaurent Peking

Kavli Affiliate: Gregory J. Herczeg | First 5 Authors: Nicole Arulanantham, Kevin France, Keri Hoadley, P. C. Schneider, Catherine C. Espaillat | Summary: Ultraviolet spectra of protoplanetary disks trace distributions of warm gas at radii where rocky planets form. We combine HST-COS observations of H2 and CO emission from 12 classical T Tauri stars to […]


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Analysis of Polarimetry Data with Angular Uncertainties

Posted by klaurent MIT

Kavli Affiliate: Herman L. Marshall | First 5 Authors: Herman L. Marshall, , , , | Summary: For a track based polarimeter, such as the Imaging X-ray Polarimetry Explorer (IXPE), the sensitivity to polarization depends on the modulation factor, which is a strong function of energy. In previous work, a likelihood method was developed that […]


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A variational approximate posterior for the deep Wishart process

Posted by klaurent Cornell

Kavli Affiliate: Christopher Ober| First 5 Authors: Sebastian W. Ober, Sebastian W. Ober, , , | Summary:Recent work introduced deep kernel processes as an entirely kernel-based alternative to NNs (Aitchison et al. 2020). Deep kernel processes flexibly learn good top-layer representations by alternately sampling the kernel from a distribution over positive semi-definite matrices and performing […]


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Single-cell genomics reveals region-specific developmental trajectories underlying neuronal diversity in the human hypothalamus

Posted by klaurent UCSF

Kavli Affiliate: Arnold Kriegstein | Authors: Brian R Herb, Hannah J Glover, Aparna Bhaduri, Carlo Colantuoni, Tracy L Bale, Kimberly Siletti, Sten Linnarsson, Rebecca D Hodge, Ed Lein, Arnold Kriegstein, Claudia Doege and Seth A Ament | Summary: Abstract The development and diversity of neuronal subtypes in the human hypothalamus has been insufficiently characterized. We […]


Continue.. Single-cell genomics reveals region-specific developmental trajectories underlying neuronal diversity in the human hypothalamus