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 36 for “"hexagon"”.
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Cracking of cold drawn resulfurized type 303 hexagon bars
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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Investigation on High-Mobility Graphene Hexagon Boron Nitride Heterostructure Nano-Devices Using Low Temperature Scanning Probe Microscopy
… in high-mobility graphene encapsulated by hexagonal boron nitride and in a weak perpendicular magnetic field. We employ a magnetic focusing transport configuration to image carriers that emerge ballistically from an injector, follow a cyclotron path due to the Lorentz force from an applied …
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Influence of Hexagonal Height on the Stress Distribution
Hexagon is important in maintaining the resisting stability of the screw in implant with external connection. There have been some studies on the experimental methods according to the external hexagon height or shape. However there have been no studies on the stress distribution of the lower …
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Collapsibility behaviour of ABS P400 and PMMA used as sacrificial pattern in direct investment casting process
… internal structures which are hollow, square and hexagon patterns. The thermal properties of the materials were studied by thermogravimetry analyzer (TGA) and linear thermal expansion. The collapsibility screening was determined to investigate the behavior of the patterns underneath the expansion. …
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Trade-off analysis of accuracy and spatial resolution in strategic forest planning models
… forest cover polygons into the uniform hexagon block sizes of 5, 10, 20, 50 and 100 ha. To quantitatively assess accuracy, deviations caused by spatial generalization were calculated by criteria for hexagon scenarios relative to the base case. Criteria include model inputs (area of …
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An Investigation of Heat Transfer to the Implant-Bone Interface and Marginal Gingiva During Preparation of Implant Abutments in the Mouth: in vitro study
… of 4mm, length of 13mm of the USII(external hexagon connection) implant fixture and with diameter of 4.1mm, length of 13mm of the SSII(internal hexagon connection) implant fixture were used and thermocouple wire was attached to the cervical, middle and apex of the machined surface. Cemented, …
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Analytical and Computational Studies of Convection in Solidifying Binary Media
… modes of convection in the form of either hexagonal cells or nonhexagonal cells such as rolls, rectangles, and squares. No assumption is made on the thickness of the mushy layer, and a number of simplifying assumptions made in previous nonlinear analyses are relaxed here in order to study a …
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Characterizing aerobic and anaerobic performance in alpine skiing
… improved from April to September (p < 0.01). Hexagon jump performance improved over 26 months in the clockwise (p < 0.05) and counterclockwise directions (p < 0.01). These results demonstrate the changes in aerobic and anaerobic performance in youth alpine skiers during different seasons and …
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Estimating Atlantic Basin Tropical Cyclone Landfall Probability for the United States
… the United States. A tessellation of 3,375 hexagons are systematically evaluated and eventual landfall probabilities are calculated for all storms passing through each hexagon. Probabilities are calculated and mapped for each of twelve states and regions from Texas to Maine. The maps show …
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GAN-ON- SI(100) NANOSTRUCTURES FOR OPTOELECTRONICS APPLICATIONS
… for the deposition of GaN which has six-fold (hexagon) atomic symmetry. Anisotropically etched-holes with Si(111) sidewalls arranged in a triangular-array was found to be desirable to obtain continuous GaN epilayer films. The presence of vicinal surface on the exposed Si(111) planes resulted in …
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Effective properties of magneto-electro-elastic two-dimensional cellular solids
… including square, equilateral triangle and hexagonal systems, were considered and comparisons between the results of all the geometries were established. The triangular cellular solid was the stiffest among all shapes, and the regular hexagon cellular solid showed the highest effective …
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The effects of sleep extension on physical and cognitive performance in AROTC cadets
… of a vertical jump, 3-repetition maximal hexagon deadlift, 300-meter shuttle, and a 1-mile run; and cognitive test consisted of a psychomotor vigilance test, the Purdue pegboard test Tiffin (1948), the STROOP color-word test Jensen (1965), and a simulated shooting exercise. Wilcoxon Signed …
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A test of Holland's hexagonal model of occupational classification using an inner-city high school population
… matrix. The data were then displayed on a hexagonal model. The relationships among the scales on the hexagon were treated by Spearman and Kendall correlation coefficients. The results indicated that the relationships were significant at the .001 level. The second hypothesis required a …
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Postsecondary Education Preparation/Career Exploration: Designing a Pilot Educational Counseling Program for Rural Counties
… (VAK) learning styles assessments, and Holland Hexagon (RIASEC) vocational preference inventories, have been administered to high school students as a component of postsecondary education and career preparation assistance. Available literature suggests that at the high school level, assessments …
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Distributed Regular Topology Overlay Formation in Multihop Wireless Networks
… network lifetime. T-Hex creates a regular hexagonal topology in a randomly deployed WSN by finding six neighbors that best fit hexagonal shape. T-Tri extends the work of T-Hex and creates a triangular topology by distributively eliminating nodes from the existing hexagons. We evaluate T-Hex …
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Überlebensrate, Frakturfestigkeit und Frakturmodus von keramischen Implantatpfosten nach Kausimulation
… Standarddurchmesser-Implantate mit externem Hexagon wurden in drei Gruppen zu je 16 aufgeteilt. Gruppe A wurde mit titanverstärkten ZrO2-Pfosten, Gruppe B mit Al2O3-Pfosten und die Kontrollgruppe mit konventionellen Titanpfosten versorgt. Alle Pfosten wurden mit Hilfe von Gold-Palladium …
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The evolution of honeycomb
… he postulated that bees build their comb using hexagons because it is the shape that requires the least amount of material to divide space into equal portions. Since this time, honeycomb has been used by engineers in applications that range from skyscraper supports to impact absorbers inside the …
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The effect of complex inclusion geometries on fracture and crack coalescence behavior in brittle material
… (higher and lower than the matrix), shapes (hexagon, diamond, ellipse), and relative pair orientations (bridging angle). In addition, single ellipse inclusions were tested to investigate the cracking behavior associated with an ellipse inclusion in a brittle material. Similar to previous …
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Modeling of Multi-Pulse Transformer/Rectifier Units in Power Distribution Systems
… specific topologies are studied, the 12-pulse hexagon transformer/rectifier (hex t/r) and the 18-pulse autotransformer rectifier unit (ATRU). In both cases, detailed switching model results are used to verify the operation of the average model. In the case of the hex t/r, the average model is …
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Wrinkling Patterns on Curved Surface with Gradient Curvature under Compression
… from large-scale finite element simulations that hexagonal wrinkling patterns form for stiff cores whereas stripe-wrinkling patterns develop for soft cores. Hexagons and stripes co-exist to form hybrid patterns for cores with intermediate stiffness. The governing mechanism for the pattern …
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