Zach Williams
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View article: An examination of nonlinear collisionless magnetic reconnection through eigenmode decomposition
An examination of nonlinear collisionless magnetic reconnection through eigenmode decomposition Open
This work investigates the nonlinear evolution of collisionless magnetic reconnection through a simple two-dimensional, two-fluid model that employs an eigenmode decomposition. The two-fluid model for collisionless reconnection is solved u…
View article: MoZAICS Project: State of the Field Study. Overview of Study Findings
MoZAICS Project: State of the Field Study. Overview of Study Findings Open
This report summarizes findings from three surveys (n=76) and focus groups (n=30) administered as part of the Modeling Zoos and Aquariums as Inclusive Communities of Science (MoZAICS) for Autistic Individuals project. This study was design…
View article: MoZAICS Project: State of the Field Study. Summary of Findings from Survey #3, Individual and Organizational Readiness
MoZAICS Project: State of the Field Study. Summary of Findings from Survey #3, Individual and Organizational Readiness Open
The following pages describe initial findings from the third of three surveys administered in a state of the field study as part of the Modeling Zoos and Aquariums as Inclusive Communities of Science (MoZAICS) for Autistic Individuals proj…
View article: MoZAICS Project: State of the Field Study. Summary of findings from Survey #2, Sources of Info & Recommendations
MoZAICS Project: State of the Field Study. Summary of findings from Survey #2, Sources of Info & Recommendations Open
The following pages describe initial findings from the first of four surveys administered in a state of the field study as part of the Modeling Zoos and Aquariums as Inclusive Communities of Science (MoZAICS) for Autistic Individuals proje…
View article: MoZAICS Project: State of the Field Study. Summary of Findings from Survey #1, Current Practices
MoZAICS Project: State of the Field Study. Summary of Findings from Survey #1, Current Practices Open
The following pages describe initial findings from the first of four surveys administered in a state of the field study as part of the Modeling Zoos and Aquariums as Inclusive Communities of Science (MoZAICS) for Autistic Individuals proje…
View article: Distributed Potential iLQR: Scalable Game-Theoretic Trajectory Planning for Multi-Agent Interactions
Distributed Potential iLQR: Scalable Game-Theoretic Trajectory Planning for Multi-Agent Interactions Open
In this work, we develop a scalable, local trajectory optimization algorithm that enables robots to interact with other robots. It has been shown that agents' interactions can be successfully captured in game-theoretic formulations, where …
View article: Expressive suppression as an emotion regulation technique and its potential impact on perceived stress
Expressive suppression as an emotion regulation technique and its potential impact on perceived stress Open
Expressive suppression is the process of decreasing, increasing, or maintaining emotional intensity over a period of time. It is employed as an immediate response to emotional stimuli and can result in negative psychological outcomes. This…
View article: Impact of resonant magnetic perturbations on zonal flows and microturbulence
Impact of resonant magnetic perturbations on zonal flows and microturbulence Open
Results from a joint experimental and computational effort studying the effect of resonant magnetic perturbations (RMPs) on microturbulence levels and their connection to zonal flows in the DIII-D tokamak L-mode are presented. Beam emissio…
View article: Direct Measurement of a Toroidally Directed Zonal Flow in a Toroidal Plasma
Direct Measurement of a Toroidally Directed Zonal Flow in a Toroidal Plasma Open
Zonal flow appears in toroidal, magnetically confined plasmas as part of the self-regulated interaction of turbulence and transport processes. For toroidal plasmas having a strong toroidal magnetic field, the zonal flow is predominately po…
View article: Measurements of Impurity Transport Due to Drift-Wave Turbulence in a Toroidal Plasma
Measurements of Impurity Transport Due to Drift-Wave Turbulence in a Toroidal Plasma Open
The first direct measurements of an impurity particle flux driven by drift-wave turbulence in a toroidal magnetized plasma are reported. The correlation between the impurity density and radial velocity fluctuations is measured using ion Do…
View article: Observation of trapped-electron-mode microturbulence in reversed field pinch plasmas
Observation of trapped-electron-mode microturbulence in reversed field pinch plasmas Open
Density fluctuations in the large-density-gradient region of improved confinement Madison Symmetric Torus reversed field pinch (RFP) plasmas exhibit multiple features that are characteristic of the trapped-electron mode (TEM). Core transpo…
View article: Turbulence, transport, and zonal flows in the Madison symmetric torus reversed-field pinch
Turbulence, transport, and zonal flows in the Madison symmetric torus reversed-field pinch Open
The robustness and the effect of zonal flows in trapped electron mode (TEM) turbulence and Ion Temperature Gradient (ITG) turbulence in the reversed-field pinch (RFP) are investigated from numerical solutions of the gyrokinetic equations w…
View article: scikit-learn-contrib/hdbscan 0.8.10
scikit-learn-contrib/hdbscan 0.8.10 Open
A high performance implementation of HDBSCAN clustering.