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 34 for “"Tubular structures"”.
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Three dimensional weaving of tubular structures
… of weaving living tissue into three dimensional tubular structures. This prototyped machine is not ready for patient use; however, the machine does prove the feasibility of this weaving technique. This report also includes the design of actuators that would make the prototyped machine completed …
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3D Reconstruction of Tubular Structures Using MRI Projection Images
… simple magnetic resonance technique for imaging tubular structures, such as blood vessels and catheters, and 3D reconstruction of these structures. This study includes three major chapters: one on simulation and two on experiments with MRI projection images. First, a MATLAB simulation was created …
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Experimental and Numerical Study of Ductile Metal Auxetic Tubular Structures
… the risk posed by seismic and blast loads to structures are of high interest to researchers. Auxetic structures are a new class of metamaterials that exhibit counterintuitive negative Poisson's ratio (NPR) behavior based on their geometric configuration. Cellular auxetics are light-weight and …
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Commercial application of aluminum honeycomb and foam in load bearing tubular structures
Small dimension engineering tubular structures subjected to a complex load system are designed like hollow circular shells. For minimum weight design, the ratio between the shell radius and the thickness has to be as large as possible, but its maximum value is limited by the onset of local …
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Elastic stability of cylindrical shells with soft elastic cores : biomimicking natural tubular structures
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1994.
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Structural Optimization of Thin Walled Tubular Structure for Crashworthiness
… norms. Further there is a need for light weight structures in the automotive design. Structural optimization in last two decades have been widely explored to improve existing designs or conceive new designs with better crashworthiness and reduced mass. Although many gradient based and heuristic …
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Stress Wave Propagation In A ‘Simplified Surrogate Tibia’ Subjected To Blast Loading
… and nondeformable witness plates. Aluminium tubular structures were used to develop simplified surrogate tibia models with different cross-sections which used to calibrate a Finite Element Model (FEM). Strain gauges were installed on the centre of tubular structure to record the direct stress …
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ER to Golgi transport during apoptosis
… identified these fragments as vesicular-tubular structures that contained the Golgi marker n-acetyl-glucosaminyl-transferase-1. Newly-synthesised proteins translocated to the endoplasmic reticulum also failed to exit from this organelle and reach the Golgi in apoptotic cells.
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Segmentation of nerve bundles and ganglia in spine MRI using particle filters
… approach to flexible particle representation of tubular structures based on Bezier splines. We construct an appropriate dynamics to reflect the continuity and smoothness properties of real nerve bundles. Moreover, we introduce a robust image likelihood model that enables delineation of nerve …
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Annotation of Vascular Plant Structures using Haptic Assistance
… and lack of contrast from other nearby anatomic structures. To address these problems, we developed a system to annotate the vascular structure of plant samples using force feedback to interact with the surface of objects and along the centerline of tubular structures. This system annotated the …
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Supramolekulinių vamzdelinių struktūrų sintezė biciklo[3.3.1]nonano pagrindu /
… molecules would be utilized for the formation of tubular structures via end-to-end association of these synthons. General synthetic strategies leading to three generations of novel chiral cleft molecules were developed by fusing bicyclo[3.3.1]nonane framework with heteroaromatic rings containing …
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Improvements to the acoustic pulse reflectometry technique for measuring duct dimensions
In the study of tubular structures such as pipeline sections, musical wind instruments and human airways, acoustic pulse reflectometry has become established as a useful tool for non-invasively measuring the input impulse response, from which the internal duct dimensions can be calculated. In this …
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The Roles of daf-6 and Cell-Cell Interactions in Sensory Organ Morphogenesis
… daf-6 is expressed and required in several tubular structures, such as the excretory system and vulva. Thus, a similar genetic pathway is required for the formation of different lumens. Secondly, I conducted a forward genetic screen and identified and characterized mutations that suppress …
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Sensors and System Integration for Magnetic Resonance Image (MRI)-Guided and Robot-Assisted Interventions
… (ii) a novel method for 3D reconstruction of tubular structures such as catheters and blood vessels from three orthogonal MR projection images, (iii) an MR-compatible optical encoder for position feedback of the MR-compatible manipulators, (iv) a manipulator-mounted magnetic resonance …
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The design, analysis, construction, and testing of a multifunctional composite satellite structure
… in this project included thermal analyses of structures in various earth orbits, determination of structural requirements from optical performance calculations, designing of near zero Coefficient of Thermal Expansion (CTE) laminates, consideration of manufacturing and material variations in …
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On the Structural Adaptability and Dynamics of Metal-Organic Cages
… demonstrate how adaptive self-assembly, dynamic structures, and structural transformations enhance supramolecular host functionality. The first approach introduces a conformationally adaptable ZnII₈L₆ pseudo-cubic cage with tetramine subcomponents featuring 2,6-naphthylene rotary units. These …
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Optimization-Based Methods for Reconstruction and Structural Quantification of Neurons and Glia from Microscopic Images
… the accurate reconstruction of the interesting structures and the design of quantitative metrics to describe the morphology. Structural quantification of myelin sheaths from in vivo light microscopy imaging gives insights into multiple sclerosis pathology and supports drug screening. However, …
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Phase separation in giant vesicles
… area, produced by dehydration, can either form tubular structures (also known as tethers) or be utilized to perform morphological changes of the vesicle, depending on the interfacial tension between the coexisting phases and those between the membrane and the two phases. Membrane tube formation …
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Role of Sox9 In Uterine Gland Development and Disease Initiation
… indicate that mouse UGs develop as simple tubular structures and later grow multiple secretory units that stem from the main duct. The main aim of this project was to study the role of SOX9 in the UGs. Preliminary studies revealed that Sox9 is mostly found in the nucleus of the GE. vii This …
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