A5065346379- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Plant Pathogens and Fungal Diseases
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Yeasts and Rust Fungi Studies
- Forest Insect Ecology and Management
- Photonic and Optical Devices
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Magnetic properties of thin films
- Magnetic Properties and Applications
- Mycorrhizal Fungi and Plant Interactions
- Eating Disorders and Behaviors
- Millimeter-Wave Propagation and Modeling
- Plant Pathogens and Resistance
- Powdery Mildew Fungal Diseases
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Fungal Plant Pathogen Control
- Advanced Photonic Communication Systems
University of Wisconsin–Madison
2014-2024
University of California, Davis
2006-2020
Massachusetts Institute of Technology
2001-2020
University of California, San Diego
1993-2020
General Atomics (United States)
2006-2020
Princeton Plasma Physics Laboratory
2004-2020
University of Oxford
2020
Manchester Metropolitan University
1998-2020
Plasmonics (United States)
2009-2019
Duke University
2006-2019
Complex and interesting electromagnetic behavior can be found in spaces with non-flat topology. When considering the properties of an medium under arbitrary coordinate transformation alternative interpretation presents itself. The transformed material property tensors may interpreted as a different set flat, Cartesian space. We describe calculation these for transformations that spherical or cylindrical holes them. resulting then implement invisibility cloaks flat also method performing...
Abstract We demonstrate a low-profile holographic imaging system at millimeter wavelengths based on an aperture composed of frequency-diverse metasurfaces. Utilizing measurements spatially-diverse field patterns, diffraction-limited images human-sized subjects are reconstructed. The is driven by single microwave source swept over band frequencies (17.5–26.5 GHz) and switched between collection transmit receive metasurface panels. High fidelity image reconstruction requires precise model for...
Abstract The objectives of NSTX-U research are to reinforce the advantages STs while addressing challenges. To extend confinement physics low- A , high beta plasmas lower collisionality levels, understanding transport mechanisms that set performance and pedestal profiles is being advanced through gyrokinetic simulations, reduced model development, comparison NSTX experiment, as well improved simulation RF heating. develop stable non-inductive scenarios needed for steady-state operation,...
Summary • The role of water stress in the initiation collar rot by Sphaeropsis sapinea asymptomatically colonized Pinus resinosa seedlings is reported. Mortality and frequency identification pathogen was quantified for subjected to different regimes or watering regime–fungicide (benomyl) combinations glasshouse experiments. In experiment 1, seedling mortality ranged from 8% repeatedly watered 50% those driest regime; data analysis indicated a high probability that not independent regime....
The NSTX operates at low aspect ratio (R/a ∼ 1.3) and high beta (up to 40%), allowing tests of global confinement local transport properties that have been established from higher devices. plasmas are heated by up 7 MW deuterium neutral beams with preferential electron heating as expected for ITER. Confinement scaling studies indicate a strong BT dependence, current dependence is weaker than observed ratio. Dimensionless experiments increase in decreasing collisionality weak degradation...
Direct measurements of the pedestal recovery during an edge-localized mode cycle provide evidence that quasi-coherent fluctuations (QCFs) play a role in inter-ELM dynamics. Using fast Thomson scattering measurements, density and temperature evolutions are probed on sub-millisecond time scales to show gradient compared gradient. The appears drive for onset (as measured with magnetic probe diagnostics) localized pedestal. amplitude evolution these QCFs tracks including its saturation. Such...
Conventional microwave imaging schemes, enabled by the ubiquity of coherent sources and detectors, have traditionally relied on frequency bandwidth to retrieve range information, while using mechanical or electronic beamsteering obtain cross-range information. This approach has resulted in complex expensive hardware when extended large-scale systems requiring ultrawide bandwidth. Relying can create difficulties calibration, alignment, dispersive objects. We present an alternative...
We investigate the application of dynamic metasurface antennas (DMAs) to synthetic aperture radar (SAR) systems. Metasurface can generate a multitude tailored electromagnetic waveforms from physical platform that is low-cost, lightweight, and planar; these characteristics are not readily available with traditional SAR technologies, such as phased arrays mechanically steered show electronically tuned DMAs steerable, directive beams for stripmap spotlight imaging modes. This capability...
We present a method of fabricating single crystal silver nanowires based on the electroless deposition into pores polycarbonate membranes by metal amplification process. A gold film one side nanoporous membrane is used as initiation layer for growth, while are guiding growth cylindrical nanostructure. Optical microscopy and spectroscopy individual nanowires, transmission electron (TEM), TEM diffraction crystallography were to characterize nanostructures. The technique presents an...
A characterization is presented of Mo sources ΓMo, core content NMo and their dependences on the Alcator C-Mod operational regimes. The primary impurity source locations are divertor, inner wall ICRF antenna limiters. Boronization used to coat first surfaces with a thin layer B, which greatly reduces for period time, eroding away an e folding 15-50 discharges. penetration into plasma under different conditions analysed using concept factor, PF = NMo/ΓMo (s). In general, large (∼1018s-1), but...
Measurements with coherent scattering of electromagnetic waves in plasmas the National Spherical Torus Experiment indicate existence turbulent fluctuations range wave numbers k perpendicular rho(e)=0.1-0.4, corresponding to a turbulence scale length nearly equal collisionless skin depth. Experimental observations and agreement numerical results from linear gyrokinetic stability code support conjecture that observed is driven by electron-temperature gradient.
The National Spherical Torus Experiment (NSTX) has undergone a major upgrade, and the NSTX Upgrade (NSTX-U) Project was completed in summer of 2015.NSTX-U first plasma subsequently achieved, diagnostic control systems have been commissioned, H-mode accessed, magnetic error fields identified mitigated, physics research campaign carried out.During ten run weeks operation, NSTX-U surpassed record pulse-durations toroidal (TF), high-performance ~1 MA plasmas comparable to best sustained near...
To investigate psychological correlates of exercise dependence in experienced and inexperienced bodybuilders weightlifters. Secondary objectives included measuring social physique anxiety, bodybuilding identity, support among weightlifters.Thirty five bodybuilders, 31 23 weightlifters completed the scale, a version athletic identity measurement anxiety an adapted survey-clinical form.A between subjects multivariate analysis variance was calculated on scores three groups lifters for four...
We study numerically two‐dimensional nanoparticles with a non‐regular shape and demonstrate that these particles can support many more plasmon resonances than particle regular (e.g. an ellipse). The electric field distributions associated different are investigated in detail the context of near‐field microscopy. Depending on shape, extremely strong localized near‐fields, intensity larger 10 5 illumination wave, be generated. also discuss spectral dependence near‐fields show spatial observed,...
A collective scattering system has been installed on the National Spherical Torus Experiment (NSTX) to measure electron gyroscale fluctuations in NSTX plasmas. The measures with k⊥ρe≲0.6 and k⊥≲20 cm−1. Up five distinct wavenumbers are measured simultaneously, large toroidal curvature of plasmas provides enhanced spatial localization. Steerable optics can position volume throughout plasma from magnetic axis outboard edge. Initial measurements indicate rich turbulent dynamics gyroscale. will...
In this Letter we report the first clear experimental observation of density gradient stabilization electron temperature driven turbulence in a fusion plasma. It is observed that longer wavelength modes, ${k}_{\ensuremath{\perp}}{\ensuremath{\rho}}_{s}\ensuremath{\lesssim}10$, are most stabilized by gradient, and accompanied about factor 2 decrease plasma effective thermal diffusivity.
To investigate the possibility that conifer shoot blight and canker pathogen Sphaeropsis sapinea persists on or in asymptomatic red pine (Pinus resinosa) jack (P. banksiana), dormant shoots were collected from nursery seedlings forest trees. One-hundred November 1994 each of two nurseries, 100 at one nurseries. Fifty species three sites. Each was divided into four subsamples: five needle pairs current year's growth; previous a stem segment growth. Subsamples surface-disinfested, placed water...
The major objective of the National Spherical Torus Experiment (NSTX) is to understand basic toroidal confinement physics at low aspect ratio and high βT in order advance spherical torus (ST) concept. In do this, NSTX utilizes up 7.5 MW neutral beam injection, 6 harmonic fast waves (HHFWs), it operates with plasma currents 1.5 MA elongations 2.6 a field 0.45 T. New facility, diagnostic modelling capabilities developed over past two years have enabled research team make significant progress...
Objectives: To investigate the factor structure, validity, and reliability of bodybuilding dependence scale to differences in between men women competitive non-competitive bodybuilders. Methods: Seventy two male bodybuilders, 63 female 87 bodybuilders completed (BDS), exercise questionnaire (EDQ), muscle dysmorphia inventory (MDI). Results: Confirmatory analysis BDS supported a three model dependence, consisting social training mastery ( Q = 3.16, CFI 0.98, SRMR 0.04). Internal all subscales...
Negative magnetic shear is found to suppress electron turbulence and improve thermal transport for plasmas in the National Spherical Torus Experiment (NSTX). Sufficiently negative results a transition out of stiff profile regime. Density fluctuation measurements from high-$k$ microwave scattering are verified be temperature gradient (ETG) mode by matching measured rest frequency linear growth rate gyrokinetic calculations. Fluctuation suppression under negligible...
Computational imaging systems leverage generalized measurements to produce high-fidelity images, enabling novel and often lower cost hardware platforms at the expense of increased processing. However, obtaining full resolution images across a large field-of-view (FOV) can lead slow reconstruction times, limiting system performance where faster frame rates are desired. In many scenarios, highest is needed only in smaller subdomains interest within scene, suggesting an aperture supporting...
Summary Diplodia pinea (syn. Sphaeropsis sapinea ) is known as a major cause of damage to red pine ( Pinus resinosa seedlings in nurseries. The fungus can also be latent pathogen seedlings, persisting the absence gross symptoms and later proliferating under conditions that induce host stress. In fall 2004, three nurseries Wisconsin were surveyed determine potential for occurrence shoot blight on jack banksiana persistence D. or asymptomatic this species. Incidence was quantified five 1 m...