Rapid Community Innovation: a Small Urban Liberal Arts Community Response to COVID-19.

Stories of community resilience and rapid innovation have emerged during the global pandemic caused by COVID-19. As communities, organizations, and individuals have had to shift modalities during the pandemic, they have identified ways to sustain community well-being. Prior to COVID-19, colleges and universities were hailed as anchors of economic and social resilience and well-being for communities of place.

Multiscale Nature of the Dissipation Range in Gyrokinetic Simulations of Alfvénic Turbulence.

Nonlinear energy transfer and dissipation in Alfvén wave turbulence are analyzed in the first gyrokinetic simulation spanning all scales from the tail of the MHD range to the electron gyroradius scale. For typical solar wind parameters at 1 AU, about 30% of the nonlinear energy transfer close to the electron gyroradius scale is mediated by modes in the tail of the MHD cascade. Collisional dissipation occurs across the entire kinetic range k(⊥)ρ(I)≳1.

Electromagnetic transport from microtearing mode turbulence.

This Letter presents nonlinear gyrokinetic simulations of microtearing mode turbulence. The simulations include collisional and electromagnetic effects and use experimental parameters from a high-β discharge in the National Spherical Torus Experiment. The predicted electron thermal transport is comparable to that given by experimental analysis, and it is dominated by the electromagnetic contribution of electrons free-streaming along the resulting stochastic magnetic field line trajectories.

Kinetic simulations of magnetized turbulence in astrophysical plasmas.

This Letter presents the first ab initio, fully electromagnetic, kinetic simulations of magnetized turbulence in a homogeneous, weakly collisional plasma at the scale of the ion Larmor radius (ion gyroscale). Magnetic- and electric-field energy spectra show a break at the ion gyroscale; the spectral slopes are consistent with scaling predictions for critically balanced turbulence of Alfvén waves above the ion gyroscale (spectral index -5/3) and of kinetic Alfvén waves below the ion gyroscale (spectral indices of -7/3 for magnetic and -1/3 for electric fluctuations). This behavior is also qualitatively consistent with in situ measurements of turbulence in the solar wind.

Saturated state of the nonlinear small-scale dynamo.

We consider the problem of incompressible, forced, nonhelical, homogeneous, and isotropic MHD turbulence with no mean magnetic field and large magnetic Prandtl number. This type of MHD turbulence is the end state of the turbulent dynamo, which generates folded fields with small-scale direction reversals. We propose a model in which saturation is achieved as a result of the velocity statistics becoming anisotropic with respect to the local direction of the magnetic folds.

Nucleolar organizing regions in renal cell carcinoma, renal oncocytoma and renal adenoma.

Nucleolar organizing regions (NORs), as demonstrated by the silver-colloid staining technique, have been counted in 75 renal cell carcinomas (20 grade 1, 22 grade 2, 17 grade 3 and 16 sarcomatoid), eight renal oncocytomas and nine renal adenomas. Mean NOR counts were 3.27, 6.