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 89 for “"Cellular Structure"”.
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Morpho : a self-deformable modular robot inspired by cellular structure
… robot design inspired by the creation of complex structures and functions in biology via deformation. Our design is based on the Tensegrity model of cellular structure, where active filaments within the cell contract and expand to control individual cell shape, and sheets of such cells undergo …
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Characterization of the cellular structure of foamed cement using x-ray computed tomography
… this thesis were to investigate and quantify the cellular structure of foamed cement samples at varying densities as well as to demonstrate X-ray computed tomography (CT) as a valuable three dimensional (3D) characterization technique for the investigation of cementitious materials. Three …
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The Influence of Cellular Structure on the Dynamics of Detonations with Constant Mass Divergence
… waves that have a complex three-dimensional cellular structure. There is growing experimental evidence that the cellular structure of detonations promotes their propagation in the presence of losses. In spite of that, the conventional model for the detonation structure, known as the Zeldovich …
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Improving the strength of 3DP parts and development of controlled strength cellular structure investment casting shell
… the three different axes. A controlled strength cellular structure investment casting shell that enables the creation of a metal part without any stress related defects has been created. The ceramic shell has an open cell frame structure with thin inner shell where the metal casting is poured. …
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Design, Fabrication and Testing of Fiber-Reinforced Cellular Structures with Tensegrity Behavior using 3D Printed Sand Molds
… work is to improve the structural performance of cellular structures in bending applications by incorporating tensegrity behavior using long continuous fibers. The designs are inspired by the hierarchical cellular structure composition present in pomelo fruit and the structural behavior of …
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Advancing Fluorescence Microscopy Techniques for Volumetric Whole-cell Imaging
… to modern biology, revealing new insights into cellular structure and dynamics. However, imaging methods capable of three-dimensional (3D) imaging at high spatial and temporal resolution are still lacking. This thesis describes two projects aimed at advancing volumetric whole-cell imaging based …
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Profile extrusion of wood plastic cellular composites and formulation evaluation using compression molding
… of WPCs can be improved by creating a fine cellular structure while reducing the density. Extrusion processing is one of the most economical methods for profile formation. For our study, rectangular profiles were extruded using a twin-screw extrusion system with different grades of HDPE and …
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An Ultrastructural Survey of the Nuchal Glands of <i>Rhabdophis tigrinus</i> (Serpentes: Colubridae)
… were fixed, excised, and randomly sampled for cellular structure, in order to determine whether cardiac toxins are produced in the gland or sequestered from a diet of toads. Cellular morphology, including low numbers of steroidogenic mitochondria, polyribosomes, and evidence of pinocytotic …
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Micromechanical Modelling of Wood and Fibre Properties
… work involves both characterizing the structure of wood at the microstructural level and the testing of clear-wood specimens. The experiments at the microstructural level provide valuable information concerning the cellular structure of wood, information needed for modelling wood on the …
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Biopolymer foams from Novatein thermoplastic protein and poly(lactic acid)
… during bubble growth and hold the newly formed cellular structure. The low melt strength of Novatein, however, make it difficult to induce a cellular structure in the proteinous bioplastic. Therefore, the foaming ability of Novatein can be improved by blending with PLA, which can successfully be …
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Structure and Properties Relationships of Densified Wood
… microscopy was employed for observing changes in cellular structure of densified wood. Existence of the cell wall fractures was evaluated using image processing and analysis software. Changes in cellular structure were correlated with the results of the tensile test. Chemical composition of wood …
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Structure-Property Relationships in Polymeric Materials Generated by Electron Beam Processing
… The first study involves the generation of cellular materials by electron beam irradiation. A technique was developed for generating a cellular structure in a radiation curable composition prior to irradiation, extruding the composition, and then curing the froth in the electron beam …
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Green fluorescent protein as a mechanical sensor
Inquiry into intracellular and cytoskeletal mechanics requires an intracellular mechanical sensor to verify models of sub-cellular structure dynamics. To this end, the green fluorescent protein (GFP) is considered as a mechanical sensor candidate with many desirable characteristics. Implicit …
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Structure-Property Relationships of Flexible Polyurethane Foams
This study examined several structure-property features of flexible polyurethane foams that are important aspects of foam production. AFM and WAXS were used to demonstrate the existence, for the first time in typical polyurethane foam systems, of lamellae-like polyurea structures ca. 0.2 mm long …
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Temperature and mold size effects on density gradients and mechanical properties in a polyurethane foam system
… smooth, thin skin forms between the mold and the cellular structure of the foam. Density gradients and the skin are shown to have an effect on the mechanical properties of the foam; This work will investigate the effects of processing temperature and mold size on the average density, density …
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Analyzing GFP-tagged cytoskeletal protein colocalization in human carcinoma cells
… as dynamic, complex components involved in cellular structure and signaling. Characterizing the roles of such proteins would greatly benefit many research areas, including the study of cancer and protein-related diseases. There is currently no accurate, high throughput method of image …
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Analytical investigations of convective effects on a solid-liquid interface
… The non-planar interface is shown to have a cellular structure identical to the convection patterns which arise in this situation.
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Spark Gap
… occurring along the perfect zigzag line of its cellular structure. On the floor, there is a linen shag rug, marked as if struck by lightning. This exhibition is named for an interstitial charge, arcing across distance or difference. But this charge is also found in intersections and …
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