Kavli Affiliate: Hsiaowen Chen |Summary:Ultraviolet spectroscopy with the Hubble Space Telescope (HST) provides the most direct and sensitive probe of the disk-circumgalactic medium (CGM) interface at radii of 20 kpc, where galaxies exchange gas, metals, and energy with their surroundings. Many of the key diagnostics of the multiphase circumgalactic medium — including H I, O […]
Kavli Affiliate: Martin Lindquist | Authors: Li-Bo Zhang, Amin Dehghani, Li Hu, Patrick Sadil, Liz Losin, Martin Lindquist and Tor Wager | Summary: Neuroimaging studies typically assume that sensory properties are encoded in response magnitude within fixed neural populations. However, this approach does not capture changes in the spatial extent of activation topography, despite growing […]
Kavli Affiliate: Susan Clark | Summary:Gaussian processes are a powerful tool for modeling continuous fields, but their naive $mathcalO(N^3)$ computational cost and $mathcalO(N^2)$ memory requirement often limit their practical use. Vecchia’s approximation is a sparse precision matrix approximation for stationary, decaying kernels that conditions each point only on its $k$ nearest neighbors. We present GraphGP, […]
Kavli Affiliate: Roberto Maiolino | Summary:We present gas-phase metallicities of star-forming galaxies at $z=1$-10 with deep JWST/NIRSpec spectra from the JADES full data release, Dark Horse, and OASIS programmes. We stack $sim$1500 medium-resolution spectra, yielding detections of the [OIII]$λ$4363 auroral line down to $12+log(mathrmO/H)=7.0$ to derive stack-based strong-line calibrations over the metallicity range $12+log(mathrmO/H)=7.0$-8.7. At […]
Kavli Affiliate: Susan Clark | Summary:Magnetic fields permeate the multiphase interstellar medium (ISM), yet their phase-dependent structure remains poorly constrained by observations. Dust polarization and ionH1 emission together offer complementary probes of the plane-of-sky magnetic field and cold neutral medium (CNM) gas structure, respectively. Recent observational work has shown that in the diffuse ISM, the […]
Kavli Affiliate: Morteza Gharib| Summary:Data-driven modeling shows significant promise for faster-than-real-time forecasting of fluid flows. For real-world engineering applications (e.g., flow control), models must contend with limited, imperfect, and incomplete experimental measurements. In this work, we present an analysis of data-driven surrogate models trained to forecast the time-evolution of experimentally measured cylinder wakes in the […]
Kavli Affiliate: Morteza Gharib| Summary:Data-driven modeling shows significant promise for faster-than-real-time forecasting of fluid flows. For real-world engineering applications (e.g., flow control), models must contend with limited, imperfect, and incomplete experimental measurements. In this work, we present an analysis of data-driven surrogate models trained to forecast the time-evolution of experimentally measured cylinder wakes in the […]
Kavli Affiliate: Giorgio Gratta | Summary:We report on the optimization of high voltage vacuum feedthroughs meant to minimize the electric field on the vacuum side of the device. We find that commercial feedthroughs generally have center conductor diameters which are too small, resulting in unnecessarily large fields. We study the problem with analytical calculations and […]
Kavli Affiliate: Giorgio Gratta | Summary:We report on the optimization of high voltage vacuum feedthroughs meant to minimize the electric field on the vacuum side of the device. We find that commercial feedthroughs generally have center conductor diameters which are too small, resulting in unnecessarily large fields. We study the problem with analytical calculations and […]
Kavli Affiliate: David Muller | Summary:Modification of superconductor-dielectric interfaces is known to strongly impact coherence times of superconducting quantum devices. This relationship is thought to arise from differences in the concentration of "two-level system" defects in the disordered dielectrics and superconductor-dielectric interfaces; these defects couple to electromagnetic modes in the device and cause dissipation. Zirconium […]