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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 57 for “"wrinkle"”.
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Mathematical Modelling of Wrinkle Formation in Bacterial Biofilms
… under certain conditions can display an unusual wrinkled structure, the pattern of which can vary at different locations throughout the biofilm. It is known that the type of wrinkle morphology displayed can be partially attributed to the expression of particular genes, which also have an effect …
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Compliant interfaces for wrinkle control and strain attenuation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Ordering of Nanoparticles by Wrinkle-Assisted Self-Assembly : Controlling Plasmonic Coupling Effects
… oxidation. After releasing the strain, periodic wrinkles appeared perpendicular to the applied strain. Under defined conditions, such wrinkles have a regular sinusoidal topology featuring a single dominant wavelength and amplitude. The formation process could easily be tuned by tuning the plasma …
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Development of non-formaldehyde wrinkle resistant finishes for cotton and linen using carboxylic acids
<p>This study aims to develop and evaluate the wrinkle recovery performance of cotton and linen fabrics after treating them with an appropriate combination of mono and dicarboxylic acids in the presence of ingredients like an initiator and a catalyst. Therefore, an experimental study was developed …
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Developing a Computer System for the Generation of Unique Wrinkle Maps for Human Faces. Generating 2D Wrinkle Maps using Various Image Processing Techniques and the Design of 3D Facial Ageing System using 3D Modelling Tools
… of ageing is the appearance and development of wrinkles. Facial wrinkles are skin folds; their shapes and numbers differ from one person to another, therefore, an advantage can be taken over these characteristics if a system is implemented to extract the facial wrinkles in a form of maps. This …
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Understanding the correlation between wrinkle morphology, fracture and fatigue of plain woven CFRP laminates through mechanical and ultrasonic characterization.
Wrinkles, often perceived as manufacturing defects in carbon fiber-reinforced polymer (CFRP) laminates, can significantly alter the fracture and fatigue behavior of composite structures. This dissertation presents a comprehensive experimental investigation into the influence of out-of-plane …
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Field-Scale Monitoring and Laboratory Simulation of Geosynthetic Liners During Construction and After Placement of Waste
Two physical issues of geomembrane wrinkle deformations and downslope shear deformations – that need to be considered to obtain good long-term geomembrane liner performance – are examined. First, field-scale monitoring of geomembrane wrinkles in a 1.5-mm-thick, black high-density polyethylene …
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Effect of Geometric Imperfections (Wrinkles) on the Circumferential Strength of a Composite Polymer Liner for Pressure Pipes
… in the formation of geometric imperfections (wrinkles) as the external diameter of the liner often exceeds the internal diameter of the host pipe. Previous studies have suggested that the wrinkles have a detrimental effect on the structural performance of the liner. In this study, experimental …
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Voltage programmable diffraction grating device
… the device is to create sinusoidal undulation (wrinkle) on the surface of oil. This wrinkle is used as a variable diffraction grating that changes the wrinkle amplitude in proportion to the applied voltage squared. The device consists of a thin layer (between 8 μm and 50 μm) of 1-Decanol oil …
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Design and testing of fiber-constrained electroactive polymer
… robotics and small scale actuation. Also, micro-wrinkle instabilities that occur in fiber-constrained membranes are examined. The property of wrinkle defers by controlling the geometrical parameters and the amount of strain in a membrane. Therefore controlling the shape of wrinkle is applicable …
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Wrinkling Patterns on Curved Surface with Gradient Curvature under Compression
… and optical.</p> <p>First, we investigate the wrinkles on a tri-layer torus consisting of an expanding thin outer layer, an intermediate soft layer, and an inner core with a tunable shear modulus. This study is inspired by pattern formations and evolutions in developmental biology, such as …
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Wrinkling of Membrane and Thin Film under Torsion
… wrinkling or effectively controlling the wrinkle patterns.</p> <p>Many works have been published about wrinkling in the thin sheets since the 20<sup>th</sup> century. However, there is no simple analytical way to systematically characterize the wrinkling in these studies. In this work, a …
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Characterization of sub-surface wrinkles within a laminated composite using a novel phased array ultrasonic scanning technique incorporating a portable nozzle and robotic arm.
… compromised by the presence of out-of-plane wrinkles, a manufacturing defect that occurs in thick complex curvature composite stacks. This thesis presents an ultrasound scanning technique utilizing a novel phased array approach to detect out-of-plane wrinkles and, unlike previous literature …
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Polymerization-Crosslinking Fabric Finishing, With Pad-Dry-Cure, Using Nonformaldehyde Btca/IA/AA Combinations to Impart Durable Press Properties in Cotton Fabric
… variable, breaking strength, tear strength, wrinkle recovery angle whiteness index, and durable press rating. Based on the results of the reduced regression equations and range dispersion of mean values of finished fabric properties. The results of the study indicated the some BTCA/IA/AA …
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Buckling patterns on pre-stretched bilayer shells
… of buckling patterns: from the classic periodic wrinkle to creases, folds, and high aspect ratio ridges. Our system is capable of easily transitioning between these buckling patterns, a first for biaxial systems. We focus on the wrinkle to ridge transition, where we find that pre-stretch plays an …
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3D facial modeling with geometric wrinkles from images
… details while deforming, which means lack of wrinkles while face shows different expressions. Also, to create a realistic face model for an individual is also needs complex setup and sophisticated works from experienced artists. The goal of this dissertation is to achieve an end-to-end system …
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The role of physical interactions in shaping the genetic diversity of spatially expanding phage and bacterial populations
… biofilm-former which characteristically displays wrinkle formation. I show that wrinkles, by virtue of supporting liquid channels beneath their surface, allow for the escape of initially trapped clones during spatial expansions, a process that requires phenotypic heterogeneity and wrinkle …
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Multi-scale analysis of wrinkling during consolidation of thermoset composites
… Among these challenges are the formation of wrinkles and defects throughout the manufacturing process. Currently, manufacturing composite parts with mitigation of defects greatly relies on the designers’ experience and the outcomes of trial-and-error procedures. Due to the high cost of …
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Mechanics of graded wrinkling
… bonded to a substrate of a softer material, wrinkled patterns can be created by inducing compressive stress in the thin film. Using this same principle, changing the geometry of the surface or other means of creating a gradient in the stress distribution along the film, a gradient in the …
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