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 18 of 18 for “"cutout"”.
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Dose Calculation For Electron Therapy
… depth dose curves of different circular cutouts were measured using four electron beam energies (6, 9, 12, and 15 MeV), four electron applicator sizes (6×6, 10×10, 14×14, and 20×20 cm), three source-surface distance values (100, 105, 110 cm). The measured …
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The compressive failure of graphite/epoxy plates with circular holes
… 12.70 cm by 25.40 cm and containing circular cutouts ranging to 3.81 cm are reported. Two thicknesses, 24 ply and 48 ply were chosen to differentiate between stability failures due to buckling and strength failures due to the presence of the cutout. The critical load of the 24 ply panels was …
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Low Reynolds Number Laminar Separation Bubble Control Using a Backward Facing Step
… XFOIL CFD code. It was concluded that the step cutout modification improves the airfoil’s lift-to-drag ratio at low angles of attack by tripping the boundary layer and decreasing the size of the laminar separation bubble. For higher angles of attack, the step cutout degraded the performance of …
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Feasibility of helically stiffened construction for a formula racing car structural shell
… circular cross-section shells with the cockpit cutout and reinforcements usually present in real racing car structural shells, ±4S' helically stiffened shells are 200% stiffer in torsion than sandwich shells. For square cross-section shells, the torsional stiffness improvement obtained with the …
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Global/local analysis of laminated panels with cutouts and cracks
… laminated composite panels, with cutouts and cracks. The approach primarily involves two steps. In the first step a global approach, the Rayleigh-Ritz method, is used to calculate the response of the structure. Displacement based Ritz functions for the plate without the cutout are …
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Finite element stress analysis of idealized composite damage zones
… away from free edges and the damage zone. 9. The cutout extending down to a ±45 interface may produce large stress concentrations near the edge of the damage zone, depending upon the fiber orientations and stacking sequence. 10. Elastic results adequately predict where failure initiates for the …
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A silicon micromachined subminiature condenser microphone : analysis, design, fabrication and testing
… square and circular shapes including those with cutouts (openings) and abrupt changes in thickness are obtained. The results show that the natural frequencies increase as the size of cutout increases, and also when the abrupt change in thickness increases. But, the increase due to abrupt change …
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Identification and investigation of local optima in aerospace structural design
… as the position of the center of a square cutout was varied within a constrained area. The rib linear buckling factor versus the centre position O(X, Y) of the square cutout was plotted in a 3D surface contour plot. Load path theory and relevant plate buckling theories were used to explain …
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Experimental method of analyzing stress intensity factors and singularity order in rocket motor geometry
… ratios in pressurized cylinder with star-shaped cutout in order to study the stress intensity factor distribution along the flaw border and to estimate the loss of the inverse square root singularity when the crack border intersects the inner star surface at right angles. By applying a refined …
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Investigations into deep cracks in rocket motor propellant models
… emanate from the fingertips of the star-shaped cutout cylinders. Using three-dimensional photoelasticity and proper algorithms in fracture mechanics, the stress intensity factors (SIF's) and the stress singularity orders along the crack front have been calculated. A surface effect on the …
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Avenida Josefa Taveira: estudo do uso e ocupação do solo na perspectiva comercial.
… Taveira, in business perspective, through a cutout in the path is the roundabout Banking / Mangabeira until the signal from Public Market neighborhood in evidence. The method used was descriptive and reflective approach to the process of transformation that capitalism promotes the area in …
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Thermomechanical and Vibration Analysis of Stiffened Unitized Structures and Threaded Fasteners
… stiffened composite panels with internal cutouts. The former problem was analyzed using a global/local approach using the commercial finite element software ANSYS while a fully functional code using isogeometric analysis was developed from scratch for the latter. For the threaded …
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Curvature effects on the stability of three-dimensional laminar boundary layers
… and sweep angle on an airfoil with a concave cutout in the leading edge region of the lower surface. It is known that convex curvature has a stabilizing effect on the laminar boundary layer. Conversely, concave curvature has a destabilizing effect. The magnitude of these effects for swept wing …
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Aaru's Awakening special effects
… special effects that were implemented are Shadow Cutout and Heat Distortion for full screen background and selected geometry. The third was lighting for the main character’s teleportation projectile. Aaru is the game’s main character, and one of his special abilities is firing a burning projectile …
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Compensation of Cotton to Square Removal at Various Rates
… tracking major phenological stages PHS, FF, and Cutout of cotton at various rates of square removal. In 1998, DPL 51 was planted on May first at the Tidewater Agricultural Research and Extension Center in Suffolk, Virginia. This was an ideal location, planting date, and variety, so in 1999, the …
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Computational and Experimental Investigation of Seismic Structural Fuse Shapes for Structural Systems
… fuse consists of a steel plate with engineered cutouts leaving a configuration of shear-acting links remaining. There have been several studies on various cutout patterns for shear-acting structural fuses including butterfly-shaped links, hourglass-shaped links, elliptical holes, and link shapes …
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Three essays in commodity futures markets
… live cattle futures and negotiated boxed beef cutout prices. To account for temporal differences in information contained in boxed beef report release, Friday afternoon boxed beef prices are compared to both current day and one-day prior live cattle futures settlement prices. Extensive testing …
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Artificial Neural Networks-Driven High Precision Tabular Information Extraction from Datasheets
… process and fine-tuning it with Table Aware Cutout (TAC) augmented images. TableDet achieves the highest F1 score for table detection against state-of-the-art solutions on ICDAR 2013 (complete set), ICDAR 2017 (test set) and ICDAR 2019 (test set) with 100%, 99.3% and 95.1% respectively. We …