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 102 for “"High Speed Video"”.
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High-speed video microscopy in optical tweezers
… in tracking more than one par- ticle at high enough frame rate. Recent advances in video camera technology allow the collection of images at several kHz. However, there has been little use of high-speed cameras in optical tweezers, partly due to data management problems and affordability. …
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Extracting fluid properties through high-speed video analysis
… properties by analyzing refractive motion in high speed video. We present a method of extracting fluid properties by performing video motion analysis using an automated wavelength matching filter followed by fitting of the measurements to theoretical capillary-gravity wave dispersion …
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High-speed video observation and on-line measurements of oil aeration in an internal combustion engine
… process was visualized in the oil sump using high-speed video equipment, at engine speeds below 4000rpm. Oil droplets were observed to depart the crankshaft at approximately the tangential velocity, pass through drainage gaps in the windage tray, and strike the free surface of the oil. The …
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Experimental investigation of subcooled flow boiling using synchronized high speed video, infrared thermography, and particle image velocimetry
… of water was experimentally investigated using high-speed video (HSV), infrared (IR) thermography, and particle image velocimetry (PIV) to generate a unique database of synchronized data. HSV allowed measurement of the bubble departure diameter. IR thermography allowed measurement of wall …
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Automated Segmentation and Analysis of High-Speed Video Phase-Detection Data for Boiling Heat Transfer Characterization Using U-Net Convolutional Neural Networks and Uncertainty Quantification
… and optimization of heat transfer systems. High-speed video (HSV) imaging is a powerful tool for capturing the intricate details of boiling processes. However, the manual analysis of HSV data is time-consuming and prone to subjective interpretation. This thesis presents a novel approach for …
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Development of High Speed High Dynamic Range Videography
High speed video has been a significant tool for unraveling the quantitative and qualitative assessment of phenomena that is too fast to readily observe. It was first used in 1852 by William Henry Fox Talbot to settle a dispute with reference to the synchronous position of a horse's hooves while …
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Acoustic emissions in hydraulic fracturing of Barre granite
… are analysed in conjunction with water pressure, high resolution images, and high speed video taken during the experiment. Section 3 of this work outlines the selection and subsequent modification of the AE acquisition system with a specific focus on capturing AE at the end of each experiment in …
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The effects of orientation angle, subcooling, heat flux, mass flux, and pressure on bubble growth and detachment in subcooled flow boiling
… in subcooled flow boiling were studied using a high-speed video camera in conjunction with a two-phase flow loop that can accommodate a wide range of flow conditions. Specifically, orientation angles of 0' (downward-facing horizontal), 30°, 45°, 60°, and 90° (vertical); mass flux values of 250, …
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Kinematic and vortical wake patterns of rapidly maneuvering fish and flapping foils
This project examines the choreography of high speed turns performed by Danio aequipinnatus, giant danio, with the goal of understanding the motions that allow this species to perform its highly efficient maneuvering. Observations of the turns were made using high-speed video to determine general …
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An experimental investigation of roll coating phenomena
… with state-of-the-art image processing and High Speed Video photography. Experiments reveal that the flow associated with the Classical mode of operation is essentially one-dimensional throughout the nip; Meniscus coating flow, on the other hand, is uniquely two-dimensional, containing large …
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Design and process/measurement for immersed element control in a reconfigurable vertically falling soap film
… and velocity data will be collected with a High Speed Video system, illuminated by a Low Pressure Sodium Lamp. Approximating lines of interference within the soap film to known pressure variations, controllers will shape downstream flow to desired conditions. Though accurate measurement …
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Mixing and Combustion Studies in an Optically-Accessible Small-Bore High-Speed Direct -Injection Diesel Engine
… within the combustion chamber. In addition, high-speed video was used to study the injector and spray behavior. Results showed that the liquid jets were well defined, but asymmetric in nature. Fuel impingement on the piston bowl was observed, which was more apparent at the higher injection …
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High speed imaging of transient non-Newtonian fluid phenomena
In this thesis, I investigate the utility of high speed imaging for gaining scientific insight into the nature of short-duration transient fluid phenomena, specifically applied to the Kaye effect. The Kaye effect, noted by A. Kaye in the March 9, 1963 issue of Nature, is the deflection and rebound …
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Experimental investigation of cavitation using refrigerant in a two-phase flow system
… flow rate, and by visualizing the flow using a high-speed video camera.
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Mechanically constrained stereotypy in agonid escape responses
… Focusing on the C-start escape response, I used high-speed video to quantify maximum body curvature and changes in lateral body length during the behavior. To connect scale morphology to flexibility, I measured the length of adjacent lateral scales from micro-computed tomography (µCT) scans of …
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Single-use lancet and capillary loading mechanism for complete blood count point of care device
… interface and successfully tested a prototype. High speed video was taken of lancet motion at 50,000 frames per second, and lancet velocities were found to be -11 m/s as compared to ~3m/s for a commonly used lancet. As faster lancet velocity reduces pain, this device will be less painful than …
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Piezoelectric energy harvesting: vortex induced vibrations in plants, soap films, and arrays of cylinders
… of these vibrations in a wind tunnel, through high speed video and correlations that were found between oscillation and power output from the piezoelectric transducers. Similarly, vortex induced vibrations were explored in an approximation of a two dimensional system in a flowing soap film.
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The Effects of Locomotor Posture on Kinematics, Performance and Behavior during Obstacle Negotiation in Lizards
… forms and ecology. I also examined how sprint speed changed when crossing obstacles with a quadrupedal versus a bipedal posture. I quantified kinematics from high-speed video (300 frames/second) of lizards running down a 3m runway both with and without the presence of an obstacle. Among …
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Image Analysis of Air-bubble Injection (Front and Side View) into a Turbulent Liquid Stream
… at atmospheric pressure and room temperature. A high-speed video camera was used to capture the dynamics of the bubble formation process. Two different experimental views were used: a front view in which flow velocity was 0.80 m/s (2.68 GPM) at Reynolds number, Re=7413 and to inject air bubbles …
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Experimental investigation of small-scale breaking waves : flow visualization across the air-water interface
… were studied using surface piercing wave probes, high speed video, and Particle Image Velocimetry (PIV).
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