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 45 for “"curved surface"”.
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Collective cellular behavior on curved surface
Organ surface is tiled by a confluent monolayer of epithelial or endothelial cells, thus providing a physical barrier to the external environment. Cells on these confluent layers often remain static and non-migratory. However, they can also undergo active structural rearrangements during basic …
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Wrinkling Patterns on Curved Surface with Gradient Curvature under Compression
… on understanding the wrinkling patterns on a curved surface, i.e., tori and cones, with varying curvatures and global deformation. By tuning the geometry confine-ment and material properties, we can control the surface morphologies in these systems which can potentially be applied to wide …
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An investigation of highly underexpanded exhaust jets impinging normal to a curved surface
… jets impinging in a direction normal to a curved surface was conducted in the NASA-Langley Research Center 55-foot vacuum cylinder. The investigation included measurements of impingement pressures and measurements of various normal shock characteristics. Variables of the investigation were …
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Optimal development of doubly curved surfaces
Surfaces of many engineering structures are commonly fabricated as doubly curved shapes to fulfill functional requirements such as hydrodynamic, aesthetic, or structural. Given a three-dimensional design surface, the first step of the fabrication process is flattening or planar development of this …
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A Monte Carlo calculation of neutron reflection from various curved surfaces
… neutron beams normally incident upon the curved surface of a solid reflector are studied with the Monte Carlo method. The geometries studied are cylindrical, parabolic, and hemispherical. It is shown that when the curved surface is cylindrical, a small "focusing effect" occurs in the …
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Development of image analysis techniques to assist evaluation of both air void structure and aggregate shape factors in concrete
… and aggregate shape profiles taken from the curved surface of core samples, to classify the shape and then provide a protocol for defining the shape. This study has shown the photographs provided originally in Concrete Society Technical Report 11 and now recently re-introduced into the UK …
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Squeeze-film flows, with application to the human knee joint
… fluid filling the gap between either a flat or a curved rigid impermeable solid coated with a thin rigid or elastic layer and moving under a prescribed constant load towards a thin rigid porous bed of uniform thickness coating a stationary flat impermeable solid is considered. Three related …
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Experimental investigation of mixing in a stratified fluid due to diffusion-driven flows in a loosely-packed particle layer
… height, so these flows will also exist along the curved surface of a spherical boundary. A particle layer was created using 6.35 mm diameter Polystyrene spheres in a salt-stratified fluid. A linear density stratification was pumped into an acrylic tank from below using a double-bucket system. A …
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Computer aided analyses of symmetrically loaded thin cylindrical shell using transfer matrix method
… method. A shell is a body bounded by a double curved surface, the thickness of the shell generally being smaller than its radius. A shell is classified thin if the ratio of the thickness to radius is less than twenty. The analyses of the shell is done using the transfer matrix method. The …
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Analysis of a folded - plate concrete roof continuous with overhang
… hu the structural advantage of thin shelled, curved surface structures, and is much easier and less expensive to construct than the latter. With reference to folded plate structures continuous over a support, the problem arises of relating the geometry of the folded plates to a number of …
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Stabilized finite elements for compressible turbulent Navier-Stokes
… of manufactured solutions. Proper treatment of curved surface geometries is of vital importance in high-order methods, especially when high aspect ratio elements are used in viscous flow regions. In two dimensions, analytic surface representations are used to ensure proper surface point …
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Effects of Non-uniform Gaussian Curvature on the Collective Motion of Active Particles
… are a wide range of active systems that move on curved surface, for example, cells in crypts in the gut, vortex patterns in the mammalian cornea or actively driven microtubule bundles on a droplet.<br/><br/>Following a study (R. Sknepnek and S. Henkes, Phys. Rev. E91, 022306(2015)) of active …
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Lenticular Objects: 3D Printed Objects with Lenticular Lens Surfaces That Can Change their Appearance Depending on the Viewpoint
… this by 3D printing lenticular lenses across the curved surface of objects. By calculating the lens distribution and the corresponding surface color patterns, we can determine which appearance is shown to the user at each viewpoint. We built a 3D editor that takes as input the 3D model, and the …
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Residual stress measurement in railroad car wheels
… in stress data possible from a large sample with curved surface, corrections for a deliberate tilt of the plane of the x-ray diffractometer from the normal to the sample surface have been developed. Analysis of different misalignments are discussed. To validate our x-ray residual stress data, …
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A posteriori error estimates for the Poisson problem on closed, two-dimensional surfaces
… partial differential equation that is useful on curved surfaces. On a curved surface, the Poisson Problem features the Laplace-Beltrami Operator, which is a generalization of the Laplacian and specific to the surface where the problem is being solved. A Finite Element Method for solving the …
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Geometric and Topological Aspects of Soft & Active Matter
… due to the active drive allows polar flocks on a curved surface to support topologically protected sound modes. In an active nematic, activity instead causes topological disclinations to become spontaneously motile, driving defect unbinding to organize novel phases of defect order and chaos. In …
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Nonlinear beam-based vibration energy harvesters and load cells
… is comprised of a cantilever wrapping around a curved surface as it deflects. Static force versus displacement tests and dynamic "initial displacement" tests verified the spring theory for a large range of oscillator parameters. Various human motion energy harvester configurations that use the …
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Calorimetric studies of small-molecule adsorption to carbon nanotubes
… a greater degree of n-orbital overlap with the curved surface of carbon nanotubes (CNTs) adsorb more strongly. ITC studies also indicated that adsorption of a in-basic metalloaromatic gold pyrazolate trimer, [Au(3,5- Et2Pz)] 3, to SWCNTs in DMF is accompanied by a large negative enthalpy change, …
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Development and Application of Stochastic Methods for Radiation Belt Simulations
… to two-dimensional local diffusion on a curved surface in the (M,K,L) phase space.
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Research on hybrid manufacturing using industrial robot
… stereo vision, laser scanning technology and curved surface compensation algorithm, it enhances the automation level and adaptiveness of hybrid manufacturing process. The third research issue extends the robotic hybrid manufacturing process to the broader application area. A mini extruder with …
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