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Showing 1 to 20 of 679 for “"Rigidity"”.
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Rigidity results for thermostats
… Hamiltonian structure is absent. We present rigidity results for thermostats that are Anosov, projectively Anosov, or have no conjugate points. For instance, we investigate rigidity under smooth orbit equivalences, and we explain how Eberlein's characterization of Anosov geodesic flows …
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Rigidity in free groups
Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2014-04-14T19:42:44Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 thesis-ex.tex: 173754 bytes, checksum: c5da772624d2323106ae5ec8436ca1b3 (MD5) Ray_Brian.pdf: 417963 bytes, checksum: …
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Equivariant elliptic cohomology and rigidity
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1999.
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Orderability and rigidity in contact geometry
<p>We study the existence of positive loops of contactomorphisms on a Liouville-fillable contact manifold (&Sgr;, ξ = ker(α)). Previous results (see [1]) show that a large class of Liouville-fillable contact manifolds admit contractible positive loops. In contrast, we show that for any …
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Rigidity and Fluidity in Living and Nonliving Matter
… Chapter 2 we revisit the concept of minimal rigidity as applied to frictionless, repulsive soft sphere packings in two dimensions with the</p> <p>introduction of the jamming graph. Minimal rigidity is a purely combinatorial property encoded via Laman's theorem in two dimensions. It constrains …
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A Study of the Rigidity of Regular Polytopes
This paper will look at the basic notions behind rigidity. We will consider bar frameworks and plate hinge structures of regular convex polytopes in many dimensions and determine their rigidity.
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Clarity without rigidity : urban performance landscape in Berlin
… design; a design that has clarity without rigidity; one that could be called 'open' as against 'shut'. This is the essence of theatrical thinking: a true theater designer will think of their designs as being all the time in motion, in action ... " -- Peter Brook, The Empty Space. (1980). …
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Rigidity and invariance properties of certain geometric frameworks
Given a degenerate (n + 1)-simplex in a n-dimensional Euclidean space Rn, which is embedded in a (n + 1)-dimensional Euclidean space Rn+l. We allow all its vertices to have continuous motion in the space, either in Rn+l or restricted in Rn. For a given k, based on certain rules, we separate all its …
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Rigidity of length functions over strata of flat metrics
In this thesis we consider strata of flat metrics coming from quadratic differentials (semi-translation structures) on surfaces of finite type. We provide a necessary and sufficient condition for a set of simple closed curves to be spectrally rigid over a stratum with enough complexity, extending a …
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On The Orbital Rigidity Conjecture And Sustained P-Divisible Groups
The orbital rigidity phenomenon for p-divisible groups was first discovered by Ching-LiChai, motivated by the Hecke orbit conjecture. Later, the general orbital rigidity conjecture was formulated and the second case of this conjecture was proved by Ching-Li Chai and Frans Oort. In this thesis we …
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Rigidity operators and the flexibility of infinite bar-joint frameworks
… sufficient conditions for the boundedness of the rigidity matrix R(G), viewed as a Hilbert space operator, for certain infinite tree frameworks. Also, we provide an analysis of the vector subspace of strictly periodic flexes implied by the translational symmetry of crystal frameworks and we prove …
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Thin Web Girder Fatigue Behavior as Influenced by Boundary Rigidity
Made available in DSpace on 2014-12-08T23:56:07Z (GMT). No. of bitstreams: 1 6408384.pdf: 4157299 bytes, checksum: e94874e7eef4e5f993eb17f06d3a2616 (MD5) Previous issue date: 1964
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Rigidity of symplectic fillings, symplectic divisors and Dehn twist exact sequences
… fillings of contact 3-manifolds arising from the rigidity of closed symplectic four-manifolds with non-positive Kodaira dimen- sion. This perspective provides surprising consequences which, in particular, captures a new rigidity phenomenon for exact fillings of unit cotangent bundle of orientable …
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Rigidity in Frictional Particle Packings and Dynamics in Living Polymeric Packings
… acts. The first act encapsulates a study of the rigidity transition in frictional particle packings, or how a packing goes from floppy-to-rigid as its particle density increases, for example. While consensus has emerged regarding the nature of the rigidity transition in frictionless packings, …
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Dynamics of Cellular Rigidity Sensing on the Micron and Sub-micron Scale
… mechanical parameters such as geometry and rigidity of the substrate are controlled independently and forces exerted by cells were measured. The experimental system for this study is based on fabrication of micron and submicron pillar substrates and their surface functionalization and …
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An Analysis of the Torsional Rigidity of An Intermittently Stiffened I Beam
Made available in DSpace on 2014-12-04T23:11:09Z (GMT). No. of bitstreams: 1 6402852.pdf: 2172742 bytes, checksum: a6aad8e18658fb2804a062fffc869b11 (MD5) Previous issue date: 1963
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Codomain Rigidity of the Dirichlet to Neumann Operator for the Riemannian Wave Equation
We study the Dirichlet to Neumann operator for the Riemannian wave equation on a compact Riemannian manifold. If the Riemannian manifold is modelled as an elastic medium, this operator represents the data available to an observer on the boundary of the manifold when the manifold is set into motion …
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Cell Migration on Opposing Rigidity Protein Gradients: Single Cell and Co-culture Studies
… and have to choose between increasing substrate rigidity or higher protein concentration. We chose to focus on this unique environment since it recapitulates several interfacial regions in vivo. We have designed novel hydrogels that exhibit dual and opposing chemical and mechanical profiles using …
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