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 2264 for “"symmetry"”.
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Symmetry plus --
Architecture is a translation of an idea. An ordering idea is vital to make architecture. A building that is symmetrical about two axis, with some necessary exceptions, is an example of such an idea.
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Symmetry and Probability
Judgments of symmetry lay at the heart of the classical theory of probability. It was by direct appeal to the symmetries exhibited by the processes underlying simple games of chance that the earliest theorists of probability were able to justify the initial assumptions of equiprobability which …
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Equivariant symmetry breaking sets
… equivariant networks are unable to produce lower symmetry outputs given a high symmetry input. Spontaneous symmetry breaking occurs in many physical systems where we have a less symmetric stable state from an initial highly symmetric one. Hence, it is imperative that we understand how to …
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Structural invariance and symmetry
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Linguistics and Philosophy, 1984.
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Stochastic Geometric Mechanics and Symmetry
We explore the interaction between geometry, symmetry, and randomness in stochastically perturbed mechanical systems, in Hamiltonian as well as Lagrangian (variational) formulations. On the Hamiltonian side, we discuss a stochastic Kepler problem with a noisy angular momentum vector. We show that …
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Anyonic symmetry and twist defects
Non-Abelian excitations are sought after because of the promise they hold for topological quantum computation. However, in spite of many proposals of systems in which they can occur intrinsically, observation has proved to be elusive. In this thesis, we study ways in which we can engineer such …
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Symmetry in Crystal Structure Prediction
… This approach utilises the point group symmetry of these units to place them on compatible, high symmetry Wyckoff sites; the use of both general and special Wyckoff sites is crucial in providing complete coverage of search space. The WAM approach was coupled with AIRSS to perform CSP on …
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Crystal symmetry and elastic constants.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1969.
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Physical symmetry enhanced neural networks
… In this thesis, we propose several physical symmetry enhanced neural network models. We first developed unitary recurrent neural networks (RNNs) that solve gradient vanishing and gradient explosion problems. We propose an efficient parametrization method that requires [sigma] (1) complexity …
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Monopoles and Pin(2)-symmetry
In this thesis we generalize the construction of monopole Floer homology due to Kronheimer and Mrowka to the case of a gradient flow with Morse-Bott singularities. Focusing then on the special case of a three-manifold equipped equipped with a spinc structure which is isomorphic to its conjugate, we …
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Higgs family symmetry and supersymmetry
… thesis we investigate building models of family symmetry that give the Higgs fields family structure. We construct several models, starting with 2 generation models then moving onto 3 generation models. These models are described sequentially in chapters 2 through 6. All of these models are …
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Groups, Graphs, and Symmetry-Breaking
A labeling of a graph G is said to be r-distinguishing if no automorphism of G preserves all of the vertex labels. The smallest such number r for which there is an r-distinguishing labeling on G is called the distinguishing number of G. The distinguishing set of a group Gamma, D(Gamma), is the set …
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On Berglund-Hübsch-Krawitz Mirror Symmetry
… the context of Kontsevich's Homological Mirror Symmetry Conjecture.
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Toric mirror symmetry and GIT windows
… the author's joint work [HZ20], studies mirror symmetry for toric varieties from the perspective of geometric invariant theory. We translate GIT constructions of toric varieties into skeletal terms and study them in the context of wrapped Fukaya categories and wrapped constructible sheaves. We …
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Symmetry in monotone Lagrangian Floer theory
… 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 spectral sequence to coefficients of arbitrary characteristic, working over an enriched Novikov ring. …
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Assessing effects of symmetry on motif finding
… misinterpretation of DNA binding site sequence symmetry. Our study seeks to model and compare the ability of three methods of a motif-finding program, consensus, taking into account orientation to accurately predict variable symmetric/asymmetric true binding site models. The three consensus …
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Chiral symmetry breaking transitions in holographic duals
… AdS/CFT Correspondence are used to study chiral symmetry breaking in dual gauge theories. We use the D3/D7 and D3/D5 systems to model both 3+1 and 2+1 dimensional, strongly coupled, gauge theories with quark fields. We show that chiral symmetry breaking is induced by either an imposed running …
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Exploiting channel symmetry in two-way channels
… or access points they communicate with. Asymmetry of constraints results in asymmetry of the cost of computation. This disparity in cost motivates efforts to shift signal processing such as channel estimation and equalization from cost sensitive devices to those with more relaxed …
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