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.
Results
Showing 1 to 20 of 147 for “"Quad"”.
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An optimizing quad translator
Thesis: B.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1985
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Quad bike injuries and injury prevention opportunities
Includes bibliographical references (leaves 45-50).
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Adaptive Frame Fields for Polycube Generation and Quad Simplification
… 2-dimensional analog of hex mesh simplification: quad mesh simplification. Existing quad mesh simplification methods are not able to output a mesh with a fully simplified singular graph. We combine the ability of frame field optimization to remove complex singularities with the ability of quad …
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Investigation of Quad Bike Rollovers in the Workplace Farm Environment
Around 70% of workplace quad bike crashes have involved the quad bike rolling over. Despite this, limited information is known about the circumstances of quad bike crashes, specifically how rollover crashes occur in the workplace. It has been hypothesised that quad bikes ridden by a rider who is …
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Control of quad-rotor UAVs using switched-system synthesis methods
… applies switched systems synthesis and linear quadratic regulator (LQR) theory to control of a quad-rotor unmanned aerial vehicle (UAV). The thesis presents the development of the system dynamics, the theory of LQR and its implementation, the synthesis and simulation results of switched control …
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An optimized dual-polarized quad-ridges horn antenna with pyramidal sidewalls
It is well known that quad-ridged horn antennas in general have impedance and radiation characteristics that are significantly worse than that of their double-ridged counterparts. Normally a voltage standing wave ratio (VSWR) of 3 over the operational bandwidth is used for the design specification …
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An embedded controller for quad-rotor flying robots running distributed algorithms
Multiple collaborating quad-rotor flying robots are useful in a broad range of applications, from surveillance with onboard cameras to reconfiguration of wireless networks. For these applications, it is often advantageous to have the robot team be a distributed system. In this thesis, an embedded …
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Stabilization and Control of a Quad-Rotor Micro-UAV Using Vision Sensors
Quad-rotor micro-UAVs have become an important tool in the field of indoor UAV research. Indoor flight poses problems not experienced in outdoor applications. The ability to be location- and movement-aware is paramount because of the close proximity of obstacles (walls, doorways, desks). The …
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Modeling, identification and control of a quad-rotor drone using low-resolution sensing
… of an electrical-motor drive model-scale quadrotor --- the AR.Drone. Equations of Motion of drone’s model were derived from Kinemics and Dynamics of common quadrotors. The identification was conducted thoroughly including its low-resolution on-board sensors, such as rate gyro and …
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STUDYING THE PERFORMANCE OF A QUAD-GENERATION SYSTEM WITH STORAGE FOR IMPROVED ENERGY EFFICIENCY
… investigate and optimize the performance of a Quad-generation system from the perspectives of both fundamental thermal dynamic analysis and system operating strategy optimization. A micro gas turbine, a compressed natural gas supply system, a hot water tank, a single-effect absorption chiller, …
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The Effects of Maxillary Quad-Helix Appliance Expansion on Cephalometric Measurements in Growing Orthodontic Patients
… conducted to examine the effects of maxillary quad-helix expansion on frontal and lateral cephalometric measurements in growing orthodontic patients. Twenty subjects, nine girls and eleven boys (x age = 10 years, 3 months), each exhibiting at least a unilateral posterior lingual cross-bite that …
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Continuous and quad-graph integrable models with a boundary: Reflection maps and 3D-boundary consistency
… this object is studied in the context of quadrirational Yang-Baxter maps, and a classification of quadrirational reflection maps is obtained. Finally, boundaries are added to discrete integrable systems on quad-graphs. Triangle configurations are used to discretize quad-graphs with …
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A waterhemp saga: Seed production, genetics, hybridization, and the creation and discovery of quad-stack individuals
Waterhemp is an old weed posing new problems for corn and soybean producers in the midwestern United States. The weed is indigenous to the Midwest, but has only become a major problem within the last two decades, and it is now one of the most prevalent weeds in Illinois. One of the most troubling …
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Wear-resistant thermal interface material (TIM) for quad/octal small form factor pluggable (QSFP/OSFP) modules
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Adaptive Control of the Transition from Vertical to Horizontal Flight Regime of a Quad-Tailsitter UAV
… Landing) aircraft that combines the agility of a quadrotor drone with the endurance and speed of a fixed-wing aircraft. For this reason, they have become popular in a wide range of applications from tactical surveillance to parcel delivery. This thesis details a clean sheet design process for a …
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An investigation of a scalable flight control system for a variable pitch, fuel powered, quad-rotor craft
Submitted in the fulfillment of requirements of the degree of Master of Mechanical Engineering, Durban University of Technology, Durban, South Africa, 2023.
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Estudio de la rehabilitación del maxilar atrófico con implantes zigomáticos. Comparación del protocolo Branemark vs el Zigoma Quad
… osteointegración de los implantes en la técnica quad y la clásica depende de la técnica utilizada, y es superior en la técnica QUAD. El éxito de los implantes zigomáticos aisladamente en cada protocolo quirúrgico es muy elevada. La tasa de éxito en la osteointegración en la técnica quad fue del …
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An Experimental Investigation of Ground Effect on a Quad Tilt Rotor in Hover and Low Speed Forward Flight
The performance of a Quad Tilt Rotor (QTR) in helicopter mode was experimentally studied in ground effect (IGE) and out of ground effect (OGE). A 0.03 geometrically scaled fuselage/wing model of the QTR was tested in hover and very low speed forward flight. Fixed-pitch propellers were used to model …
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Commissioning a Novel Quad Near Field Detector for High Energy X-Ray Diffraction Microscopy with Preliminary Applications to an Aluminum Alloy
… focus of this work is the commissioning of the Quad Near Field Detector (QNFD) for High Energy Diffraction Microscopy (HEDM) and show its usefulness for material science. A promising feature of such detectors is that they enable non-destructive, in-situ studies of material systems. This design …
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