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.
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Showing 1 to 20 of 1843 for “"Perturbations"”.
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Adversarial robustness without perturbations
Models resistant to adversarial perturbations are stable around the neighbourhoods of input images, such that small changes, known as adversarial attacks, cannot dramatically change the prediction. Currently, this stability is obtained with Adversarial Training, which directly teaches models to be …
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Density perturbations in hybrid inflation
… propose a new method for calculating density perturbations in hybrid inflation, which shows an excellent agreement with the simulation in one dimension.
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Cosmological Perturbations in the Early Universe
… two different approaches that focus on treating perturbations after gauge fixing. On one hand we work towards developing our understanding of how to handle quantization in terms of Dirac quantization and Becchi, Rouet, Stora, Tyutin (BRST) quantization. On another, we focus on how to generalize …
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Nonexplicit Singular Perturbations and Interconnected Systems
Singular perturbations have been shown to be an effective tool in the analysis and design of systems with "slow" and "fast" dynamics. However, the use of this tool is often inhibited by the fact that when physical quantities are selected as state variables the model fails to be in the standard …
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Interstellar Gravitational Perturbations of Cometary Orbits
Made available in DSpace on 2014-12-12T00:17:47Z (GMT). No. of bitstreams: 1 7212154.pdf: 2691518 bytes, checksum: 30ec6fe43239395eef63314798ecafec (MD5) Previous issue date: 1971
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Ionospheric perturbations and Schumann resonance data,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1967.
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A valence bond for several perturbations
… atoms or introducing substituents. Such spectral perturbations may be correlated with inductive and mesomeric heteroatom or substituent effects. Preliminary studies involve a comparison of semi-empirical valence bond and molecular orbital methods using similar approximations and integral values in …
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Magnetic perturbations due to current structural variations
Study of the magnetic perturbations caused by auroral currents has been conducted by rocket-borne magnetometer measurements for years. Since the horizontal auroral currents were usually found to be confined near the visible auroral arcs, as determined by Heppner [1954], Davis [1961], and Davis and …
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Robustness of complex networks to global perturbations
… with non-trivial topologies against global perturbations, following Robert May’s seminal work on network stability, in order to find critical stability thresholds of global perturbations and to determine if their impact varies across different network topologies. Numerical analysis is used …
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Trustworthy Reinforcement Learning under Constraints and Perturbations
… safety and robustness in RL under observation perturbations without relying on full system knowledge, we introduce Neural Model Predictive Shielding (NMPS), a modular shielding framework combining short-horizon trajectory prediction with real-time safety assessment. Extensive experiments across …
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Harmonic forms under metric and topological perturbations
We construct examples illustrating various aspects of Hodge theory on Riemannian manifolds. We consider the relationship between the harmonic forms on a product space and the harmonic forms on the factors as well as the harmonic forms on a connected sum and the harmonic forms on the summands. …
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Molecular dynamics studies of proteins under perturbations
The responses of proteins to different perturbations are simulated by molecular dynamics simulations, analyzed by theoretical models and compared with observations. (1) The response of temperature to temperature quenches and velocity reassignments are described in terms of the temperature …
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Quantum field theory of scalar cosmological perturbations
Using canonical quantization we show that the spectrum of the scalar cosmological fluctuations as calculated until now is not correct. We derive the correct expression for the spectrum, and show that our correct treatment alleviates the fine-tuning problem in inflation.
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Hydrodynamic and morphodynamic responses to surfzone seafloor perturbations
Holes and channels were excavated in the surf zone on an ocean beach near Duck, NC, and observations of the subsequent evolution of waves, currents, and the modified seafloor were used to investigate nearshore dynamics. In one set of seafloor perturbation experiments, deep holes with steeply …
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Robustness To Visual Perturbations In Pixel-Based Tasks
… accuracy is low. This is exacerbated when visual perturbations are introduced to inputs causing accuracy to drop, but confidence to remain high. This is similarly problematic when models use visual inputs for decision-making, such as through pixel-based Reinforcement Learning (RL) where an agent …
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Response of Electrified Micro-Jets to Electrohydrodynamic Perturbations
… of liquid jets originates from small ambient perturbations, which can grow exponentially until the amplitude as large as the jet radius is reached. For unelectrified inviscid jets, surface energy analysis shows that only the axisymmetric perturbation is possibly unstable, and this mode is …
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