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 222 for “"torus"”.
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Legendrian Torus Links
… of Legendrian links that are topologically torus links.</p>
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Hamiltonian non-isotopy between the Clifford torus and the Chekanov torus in $\R^4$
… non-isotopy between the monotone Clifford torus and the Chekanov torus in $\R^4$ by employing three Hamiltonian isotopy invariants: counting of Maslov index 2 pseudo-holomorphic discs with boundaries lying on the torus [EP], the Hamiltonian invariant associated to versal deformations and …
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Disruption prediction at JET [Joint European Torus]
… a nuclear fusion machine as JET (Joint European Torus), Disruptions pose very serious problems to the safety of the machine. The energy stored in the plasma is released to the machine structure in few milliseconds resulting in forces that at JET reach several Mega Newtons. The problem is even …
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Torus equivariant elliptic cohomology and sigma orientations
… this paper, we give a detailed construction of torus equivariant elliptic cohomology, which is a sheaf of $ \mathcal{ O}_{\mathcal{C}^n}$-algebras over $ \mathcal{C}^n$. As applications, we construct global sections for sigma functions and relates these sections to the elliptic orbifold genera.
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Isomorphism of uniform algebras on the 2-torus
<p>For \alpha a positive irrational, we consider the uniform subalgebra A_\alpha of C(T^2) consisting of those functions f satisfying \hat{f}(m,n)=0 whenever m+n\alpha<0. For positive irrationals \alpha, \beta, we determine when A_\alpha and A_\beta are isometrically isomorphic. Furthermore, we …
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Kauffman Bracket Skein Modules And The Quantum Torus
… [0, 1]) ~ AZ2 , the subalgebra of the quantum =q torus XY = q 2 Y X which is invariant under the involution X [RIGHTWARDS ARROW] X [-]1 , Y [RIGHTWARDS ARROW] Y [-]1 . Our starting point is the observation that the category of AZ2 -modules is equivalent q to the category of modules over a simpler …
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Isometries of a Torus and Geometric Equivalence of Tori
No abstract prepared.
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Vertical compact torus injection into the STOR-M Tokamak
… and density. Fuelling by injecting a compact torus (CT) may be the only viable method suitable for a reactor-grade tokamak. CTs can be injected at different angles with respect to the tokamak toroidal magnetic field, either horizontally or vertically. In vertical injection, deeper CT …
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Numerical simulation of the Jovian torus-driven plasma transport
… basic interchange instability of the Io plasma torus is opposed by pressure gradients in the energetic particles outside the torus. Many simulations have been performed for cases where the overall system is inter-change unstable under the ideal-MHD assumption E + v $\times$ B = 0. For such …
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Properties of Hamiltonian Torus Actions on Closed Symplectic Manifolds
… will study the properties of certain Hamiltonian torus actions on closed symplectic manifolds. First, we will consider counting Hamiltonian torus actions on closed, symplectic manifolds M with 2-dimensional second cohomology. In particular, all such manifolds are bundles with fiber and base equal …
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Analytic Representations of Finite Quantum Systems on a Torus
… are represented by analytic functions on a torus. This function has exactly d zeros, which define uniquely the quantum state. The analytic function of a state can be constructed using its zeros. As the system evolves in time, the d zeros follow d paths on the torus. Examples of the paths …
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A Classification of Kupka-Smale Flows on the Torus
… to topological equivalence of those flows on the torus satisfying: (1) all singular points and closed orbits are hyperbolic; and (2) there are no saddle connections. Such flows are known as Kupka-Smale flows. In the process of generating invariants for the classification a qualitative picture is …
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The inner magnetosphere of Jupiter and the Io plasma torus
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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Discontinuous Galerkin modeling of plasma turbulence in a simple magnetized torus
… in the Texas Helimak, a simple magnetized torus (SMT) experiment, has been simulated with fluid and gyrokinetic continuum models that employ the discontinuous Galerkin (DG) computational method. SMTs are physical approximations of a sheared cylinder and, with simple magnetic geometry and …
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(2+1)-dimensional gravity over a two-holed torus, T²#T²
… We consider the specific examples of a torus T2, and then the two-holedtorus, T2#T2. Previous studies of the torus are based on the fact that the torus, and onlythe torus, can support a continuous, non-vanishing tangent vector field. The results we produce here, however, are applicable …
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Limiting Behavior of Nondeterministic Fillings of the Torus by Colored Squares
… process. Given a random excited tiling of an n×n torus, we show that as t→∞ the system reaches a stable state in which no tile is excited. This stable state can either be a tiling whose tiles are all the same color, or is formed by vertical or horizontal strips of alternating colors. The third …
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The inverse limit of GIT quotients of Grassmannians by the maximal torus
… finitely many GIT quotients of 𝐺(3 𝑛) by maximal torus and between each two there is a birational map. These GIT quotients and the flips between them form an inverse system. This thesis describes this inverse system first and then, describes the inverse limit of this inverse system as a moduli …
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Optimization of FFT communication on 3-D torus and mesh supercomputer networks
… leading class of supercomputers that employ 3-D torus and mesh networks. Given the divide-and-conquer approach of the popular Cooley-Tukey approach, a parallel FFT can use a highly optimized serial algorithm for intra-node calculations, but the communication patterns between nodes reveal a …
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