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 820 for “"Lagrangian"”.
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Lagrangian structures and multidimensional consistency
The conventional point of view is that the Lagrangian is a scalar object (or equivalently a volume form), which through the Euler-Lagrange equations provides us with one single equation (i.e., one per component of the dependent variable). Multidimensional consistency is a key integrability property …
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Eulerian on Lagrangian Cloth Simulation
<p>This thesis introduces a novel Eulerian-on-Lagrangian (EoL) approach for simulating cloth. This approach allows for the simulation of traditionally difficult cloth scenarios, such as draping and sliding cloth over sharp features like the edge of a table. A traditional Lagrangian approach models …
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Calibrations and minimal Lagrangian submanifolds
… manifold). We will study the geometry of Special Lagrangian submanifolds on M and the global properties of their moduli-space. We will exhibit an example of a compact, simply connected almost Calabi-Yau threefold, which admits a Special Lagrangian torus fibration. We will also show how to …
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High Order Explicit Semi-Lagrangian Method for the Solution of Lagrangian Transport and Stochastic Differential Equations
<p>A semi-Lagrangian method is developed for the solution of Lagrangian transport equations and stochastic differential equations that is consistent with Discontinuous Spectral Element Method (DSEM) approximations of Eulerian conservation laws. The method extends the favorable properties of DSEM …
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Symmetry in monotone Lagrangian Floer theory
… we study the self-Floer theory of a monotone Lagrangian submanifold $L$ of a closed symplectic manifold $X$ in the presence of various kinds of symmetry. First we consider the group $\mathrm{Symp}(X, L)$ of symplectomorphisms of $X$ preserving $L$ setwise, and extend its action on the Oh …
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Topology of Lagrangian immersions and submanifolds
… at some of the first topological results for Lagrangian immersions and embeddings. In particular, we state and consider some applications of the h-principle of Gromov which gives a homotopy classification of Lagrangian immersions. We outline a proof of Matsushima's theorem which states that …
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Lagrangian computations of radiating fire plumes
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Lagrangian relaxation for natural language decoding
… optimality guarantees. The main tool we utilize, Lagrangian relaxation, is a classical idea from the field of combinatorial optimization. We begin the dissertation by giving a general background introduction to the method and describe common models in natural language processing. The body of the …
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Lagrangian methods for ballistic impact simulations/
This thesis explores various Lagrangian methods for simulating ballistic impact with the ultimate goal of finding a universal, robust and scalable computational framework to assist in the design of armor systems. An overview is provided of existing Lagrangian strategies including particle methods, …
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Lagrangian dispersion and deformation in submesoscale flows
… submesoscale flows and their properties using Lagrangian trajectories of observed and modeled drifters. We analyze statistics of observed drifter pairs to characterize turbulent dispersion at submeso-scales. Contrary to theoretical expectations, we find that nonlocal velocity gradients …
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Markov Chains Derived From Lagrangian Mechanical Systems
… We will focus most heavily on models drawn from Lagrangian mechanical systems with collisions: billiards).
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Generalised cohomology and relatively exact Lagrangian submanifolds
… we study the topology of relatively exact Lagrangian submanifolds. One of our main goals is to study their generalised cohomology, extending known results about their singular cohomology. We do this using different (and simpler) technical set-ups to that of Cohen, Jones and Segal [18, 16]. …
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Lagrangian study of the Southern Ocean circulation
… circulation remain poorly understood. We use Lagrangian particle trajectories, obtained from eddy permitting numerical models, to map out and quantify different aspects of the 3-D circulation. We first introduce various definitions used to quantify efficient export from the Antarctic …
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A Two-Dimensional Free Lagrangian Hydrodynamics Model
Made available in DSpace on 2017-07-06T18:42:10Z (GMT). No. of bitstreams: 3 Trease_Harold_E_PhD.pdf: 157288195 bytes, checksum: be49c5a7e822c8fb6472bb70a8eb9330 (MD5) Trease_Harold_E_PhD_ABS.pdf: 633035 bytes, checksum: eab015fa6a8f2752463304d33a91669b (MD5) license.txt: 4813 bytes, checksum: …
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Control of networked Lagrangian systems with delays
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-04-07T21:54:57Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 DissFiles.zip: 17030006 bytes, checksum: 92249adf3a2c3a3a4d466fa347b30556 (MD5) Rodriguez-Seda_Erick.pdf: 4405861 bytes, …
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Lagrangian techniques for particle flux and concentration
… particle concentration and fluxes based on Lagrangian particle trajectories. In particular, a Lagrangian concentration differential equation is solved along a particle path using Eulerian derivatives for the particle velocity divergence field. This is referred to as the Lagrangian …
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Lagrangian dynamics of turbulent Rayleigh-Benard convection
U of I Only Restriction Lifted for Item 112217 on 2021-08-24T09:15:10Z.
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Eulerian-Lagrangian stereo-to-multi-view Conversion
… One key contribution lies in combining Lagrangian and Eulerian approaches. This allows us to leverage their complementary advantages. The method achieves real-time performance on current GPUs. Its design also enables an easy hardware implementation, demonstrated using a …
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Lagrangian dispersion and deformation in submesoscale flows
… submesoscale flows and their properties using Lagrangian trajectories of observed and modeled drifters. We analyze statistics of observed drifter pairs to characterize turbulent dispersion at submeso-scales. Contrary to theoretical expectations, we find that nonlocal velocity gradients …
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A precision calculus of paired Lagrangian distributions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1994.
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