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 32 for “"creases"”.
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Facial creases in human identification
… The aim of each phase is to identify facial creases useful in human identification.In Phase 1, creases were analysed on peri- and post-embalmed cadavers in CAHID to establish whether or not there is any change to crease with facial bloating. Embalming was chosen to simulate effects seen on a …
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Analysis and detection of fingerprint creases
… we explore the possibility of using fingerprint creases for comparing two fingerprints. Creases can be described as white lines or scars on a fingerprint image. Recent studies have determined that some creases are genetically influenced although the origin of creases has not been completely …
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The development of automated palmprint identification using major flexion creases
… that can be used to identify palmar flexion creases in online palmprint images. In the first instance, a manual palmar flexion crease identification and matching method is described, which was used to compare palmar flexion creases from 100 palms, each modified 10 times to mimic some of the …
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Computational design with curved creases : David Huffman's approach to paperfolding
… for defining design approaches with curved creases by investigating the work of David A. Huffman, famous computer scientist and pioneer of curved-crease paperfolding. The history of curved folding has diverse cultural origins. I outline the boundaries of curved-crease paperfolding as a field …
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Creases and folds : applying geometry to a pop-up fashion pavilion
This thesis explores the architectural opportunities embedded in geometric folding by studying the limitations and possibilities of a variety of patterns. In particular; the thesis focuses on the Yoshimura or diamond folding pattern. By manipulating specific rules guiding the diamond fold, the …
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Flexural Mechanics of Creased Thin Metallic Strips
The introduction of creases into thin sheets has a dramatic effect on their global mechanical properties. This can be observed by manipulating a crumpled piece of paper which has been unfolded; it no longer deforms in the same way as the original sheet. Creases have typically been modelled as …
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Geometry of Creased Shell Structures
… are underpinned by motion localised within creases, albeit some that exhibit soft modes of deformation from facet bending, leading to non-rigid Origami. These non-rigid Origami structures offer several functional behaviours such as tunable stiffness, deployability, and shape morphing. As …
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Localized deformation in soft solids around spherical cavities
… deformations, cracks during expansion and creases during contractions, to investigate fracture energy and strain stiffening, respectively. A Small-scale Ballistic Cavitation device uses a high-pressure air reservoir to generate spherical deformation at high rates within soft solids. Air …
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Design, modelling and development of origami-inspired tubular compliant mechanisms towards radially closable applications
… DOFs, (2) disconnecting over-constrained creases to make it rigidly foldable, and (3) leveraging the parasitic motion of compliant joints for deformation-induced DOFs. In the study of smooth folds, a silicone-based solution was initially explored. However, due to manufacturing complexities …
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Octahedral fields for feature-aligned cross-fields
… that they penalize deviations from surface creases while otherwise promoting intrinsically smooth fields. We use these new energies to generate feature-aligned cross fields and demonstrate the applicability of our method to quad-meshing.
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Numerical Modelling of Corrugated Paperboard Boxes
… panels (flat, uncreased walls), vertical creases (fold lines between adjacent side panels), and horizontal creases (fold lines near the top and bottom of panels associated with flap folding). Section specific experiments are designed to localise deformation within the target feature, and …
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Dorsal knuckle crease pattern: utility for forensic human identification
… attempted to classify the pattern of the skin creases overlying the proximal interphalangeal (PIP) joint of the left index finger. Initial sorting resulted in 11 classification groups that were then subjected to tests of inter-observer consistency. The results of these tests found that there …
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Dinâmica de uma estrutura origâmica cilíndrica atuada por ligas com memória de forma
… by placing torsional springs in the origami creases. The origami with shape memory allows expansion and contraction in the radial direction with no physical contact. The mathematical model assumes a constitutive polynomial model to describe the behavior of the shape memory alloys. Geometric …
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Bending, Creasing, and Snapping of Soft, Slender Structures
… the thickness of the beam, microscopic surface creases appear on the top surface. In this thesis, we experimentally characterize this transition between global bending to surface creasing. Closing of Venus flytrap leaves is a classic example of well known snap-through instability. A knowledge of …
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Kinematic and dynamic modeling of Nanostructured Origami
… to the final 3D shape along pre-defined creases. This thesis describes theoretical methods that have been developed to model the actuation of origami devices. The background of origami mathematics and advances in robotics are presented in the context of modeling Nanostructured Origami. …
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Buckling patterns on pre-stretched bilayer shells
… 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 essential …
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Design of Kresling inspired architected materials by using Polyjet technique
… materials prototypes. The crucial role of their creases geometry and the visco-elastic effects related to PJ photo-polymers, were analyzed numerically and experimentally, aiming to achieve multistability and tunable energy landscapes. Hence, this analysis extends the obtained geometrical and …
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Gluing and Creasing Paper along Curves: Computational Methods for Analysis and Design
… design strategies for shapes with curved creases. Inspired by artistic origami, we offer a parametric design tool for the construction of origami spirals. Additionally, we consider two strategies that approximate a polyhedral shape with a modular curved-crease design. Finally, we provide a …
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Map folding
… paper with horizontal and vertical creases, each marked mountain or valley-has a flat folded state. This problem has remained open since then, even for the 2 x n case. This thesis presents several theoretical contributions to this problem. Most significantly, it presents an O(n⁹ ) …
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The effects of permanent creasing on two types of 65/35 polyester- cotton blends as measured by appearance, abrasion resistance and breaking strength
… panel of three judges and it was found that all creases of both fabrics whether new or laundered were very similar. The samples for both fabrics were abraded for 0, 1, 1-1/2, and 2 minutes. The wash-wear fabric had significantly better abrasion resistance than did the permanent-press. The initial …
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