Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Ion Drift"”.
-
Inversion techniques for analyzing long pulse incoherent scatter radar data with a focus on F-region ion drift estimation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
-
Estimation of ion drift velocity vector in F region ionosphere based on incoherent scattered pulse data using machine learning technique
… thesis presents work on estimating the vector drift velocities of the plasma at different altitudes in the F region of the ionosphere using machine learning techniques. The computation is based on the radar data acquired with the ALTAIR (Automatic Radar Plotting Aid (ARPA) Long-Range Tracking …
-
Ion Cyclotron Resonance Heating Induced Transport in Stellarators and Other Asymmetric Toroids
A Monte Carlo simulation is developed to model minority ion transport and fundamental ion cyclotron resonance heating (ICRH) in asymmetric magnetic field geometries. A discrete event model is used to superimpose resonance heated nonadiabatic changes in an ion's magnetic moment on a Coulomb …
-
Inversion of Arecibo incoherent scatter radar coded long pulse backscatter spectra
… waves from random density fluctuations of ionospheric plasma particles (electrons and ions). Information about particle temperatures, ion concentrations, and Doppler shifts caused by particle motions can be estimated by inverting the power spectra of received scatter signals to the …
-
Decision tree application to satellite measurement and analysis of exospheric neutral densities
… models. The first type of model makes predictions based on physical assumptions and mathematical expressions. The second type does so based on past data, applying linear regression algorithms along with polynomial and wavelet functions. The project investigates the mechanism of small-scale …
-
UNDERSTANDING ION SPECTRAL DYNAMICS NEAR THE INNER EDGE OF THE PLASMA SHEET
… fields. During the last few decades, several missions have recorded the presence of dynamic spectral features of energetic ions in in situ measurements, which represent the observational signatures of ion transport, acceleration, and loss in the inner magnetosphere. These ion spectral features …
-
Determining the role of neglected N+ heavy ions in the earth’s inner magnetosphere
Changes in the heavy ion composition in the Earth’s terrestrial ionosphere and magnetosphere can have significant impacts on the particle dynamics in the Earth’s magnetosphere-ionosphere system. The contribution of N+ to the ring current population, in addition to that of O+, has long been …
-
Finite drift orbit effects in a tokamak pedestal
… Confinement Mode" or "H Mode" of tokamak operation. This region is characterized by a drastic plasma density drop over a relatively short radial distance, typically of order of the poloidal ion gyroradius (p,,). Experiments demonstrate that H Mode plasmas have superior transport properties …
-
Characterization and Modeling of Solar Flare Effects in the Ionosphere Observed by HF Instruments
The ionosphere is the conducting part of the upper atmosphere that plays a significant role in trans-ionospheric high frequency (HF, 3-30 MHz) radiowave propagation. Solar activities, such as solar flares, radiation storms, coronal mass ejections (CMEs), alter the state of the ionosphere, a …
-
Resistive Switching in Porous Low-k Dielectrics
… it also creates many reliability and implementation issues. One of the problems is the little understood metal ion diffusion and drift in porous media. Here, we present a rigorous simulation method of Cu diffusion based on Master equation with elementary jump probabilities within the contiguous …
-
Resistive Switching Behavior in Low-K Dielectric Compatible with CMOS Back End Process
… lower interconnect time delays and power dissipation in highly integrated logic and memory nanoelectronic products, numerous changes in the materials and processes utilized to fabricate the interconnect have been made in the past decade. Chief among these changes has been the replacement of …
-
Automated Detection and Analysis of Low Latitude Nightside Equatorial Plasma Bubbles
… that generally form on the nightside of Earth's ionosphere along magnetic field lines in the upper thermosphere/ionosphere. While referred to as `bubbles', EPBs tend to be longer along magnetic latitudes and narrower along magnetic longitudes which are on the order of thousands and hundreds of …
-
Analysis of Memristor Hysteretic Systems: A Hybrid Coupled Model with emphasis on Pinching/Degrading Behavior
… model, a nonlinear geometric-based equation, and bilinear optimization to predict the response of a memristive system. The potency of the proposed model is demonstrated by a dynamic simulation of a memristor system in relation to an integrated circuit system. The proposed model provides …