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Description:: We establish the criterion for chaos in three-planet systems, for systems similar to those discovered by the Kepler spacecraft. Our main results are as follows: (i) The simplest criterion, which is based on overlapping mean motion resonances (MMRs), only agrees with numerical simulations at a very crude level. (ii) Much...
Keyword:: Warps, Protoplanetary Disks, Simulations, Chaos, Planets, and Dynamics
Subject:: Astronomy
Creator:: Rath, Jeremy
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 05/31/2023
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:16392 and etdadmin_upload_956915

Description:: We establish the criterion for chaos in three-planet systems, for systems similar to those discovered by the Kepler spacecraft. Our main results are as follows: (i) The simplest criterion, which is based on overlapping mean motion resonances (MMRs), only agrees with numerical simulations at a very crude level. (ii) Much...
Keyword:: Warps, Protoplanetary Disks, Dynamics, Chaos, Planets, and Simulations
Subject:: Astronomy
Creator:: Rath, Jeremy
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 03/24/2023
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:16392 and etdadmin_upload_956915

Description:: Missing data are often described as an annoyance in research and generally presented as a source of error or bias during analysis. To this end, methods that center on planned missingness are an underappreciated and powerful tool that can actually be used to improve data collection and the validity of...
Keyword:: Temperament, Cognitive ability, Simulations, Interests, Environmental pollution, and Missing data designs
Subject:: Geographic information science and geodesy, Personality psychology, and Behavioral psychology
Creator:: Dworak, Elizabeth M.
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 06/22/2022
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:16095 and etdadmin_upload_903324

Description:: Modeling the mechanical performance of metal produced with additive manufacturing (AM) has proven to be a challenging task. In the as-built state, these materials have been shown to exhibit strong heterogeneity and anisotropy. Even after post-processing, such as heat treatment or hot isostatic pressing and depending on the alloy, some...
Keyword:: Simulations, Additive manufacturing, Mechanical performance, and Solid mechanics
Subject:: Mechanics, Materials Science, and Mechanical engineering
Creator:: Kafka, Orion Landauer
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 04/28/2020
Date Created:: 2019-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14952 and etdadmin_upload_708678

Description:: In the last two decades the number of innovative applications for advanced materials has been rapidly increasing. Shape memory alloys (SMAs) are an exciting class of these materials which exhibit large reversible stresses and strains due to a thermoelastic phase transformation. SMAs have been employed in the biomedical field for...
Keyword:: Shape memory alloys, Constitutive behavior, Porous materials, Cyclic loading, Simulations, and Phase transformation
Subject:: Mechanical Engineering
Creator:: Michele Panico
Owner:: Scholarly Digital Publishing
Date Uploaded:: 09/08/2018
Date Modified:: 09/08/2018
Date Created:: 2008-05-08
Resource Type:: Dissertation

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