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26 results on '"Collins, Keri"'

1. Wind Turbine Surface Damage Detection Using YOLOv7 with Slicing Aided Hyper Inference (SAHI)

Author

Best, Oscar, Khan, Asiya, Gianni, Mario, Sharma, Sanjay, Collins, Keri, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, and Arai, Kohei, editor

Published
2024
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9. The effects of asymmetry on oscillatory propulsion

Author

Collins, Keri Michelle and Megill, William

Subjects
629.1323
Abstract

Owing to the problems caused by propellers, research has turned to the biological world for inspiration for non-propeller propulsion. Rays were chosen for further study and it was found that a key feature of their swimming is the asymmetric-in-time movements of their pectoral fins. The main goal was to determine whether asymmetric-in-time oscillations produced a larger resultant force. Two flexible fins were used (NACA and biomimetic stiffness profile “BIO”). Asymmetry was defined by the proportion of the time period taken to effect one half stroke. The experiments showed that at low frequencies, asymmetric oscillation produced greater resultant force and that this force was at an angle to the chord of the fin at rest. At high frequencies, the BIO fin produced lower resultant force when oscillating asymmetrically and the angle of the resultant force was the same as for the symmetric oscillations. There was no difference between the resultant force magnitude or direction produced by the NACA fin at high frequencies. More power was used when oscillating asymmetrically but the force efficiency, the resultant force per watt, was often the same for symmetric and asymmetric oscillations. The trailing edge kinematics of the fins were analysed. Some of the kinematics variables correlated with the resultant force magnitude independently of fin type. The wake structures behind the fins oscillating at two different frequencies were examined. The wakes were geometrically asymmetric behind both fins oscillating asymmetrically at low frequency. At the higher frequency, the wakes behind the asymmetrically oscillating fins were no different to their symmetric counterparts. Asymmetric-in-time oscillation is suggested as a method of effecting turning manoeuvres and forward propulsion with only one motor. Despite the increased energetic cost, asymmetric-in-time oscillations can produce larger steady-state forces than symmetric oscillations do.

Published
2012

10. Development and Implementation of an Escalation Process to Address Psychosocial Support Needs Identified in the Pre-Transplant Phase

Author

Martin, Carrie, primary, Meadors, Sara, additional, Malik, Shahbaz, additional, Collins, Keri, additional, Velasquez, Tomeka, additional, Brooks, Kathryn Ashleigh, additional, Scofield, Danielle, additional, Clemmer, Kelly, additional, Stentz, Jacklyn, additional, Rana, Cydney, additional, Burton, Mary Jo, additional, Ramakrishnan, Dr. Aravind, additional, and Shaughnessy, Paul J., additional

Published
2023
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13. Keeping Transplant & Cell Therapy Patients Safe during an Emergency - How Sarah Cannon TCT Program @ Methodist Hospital, Methodist Children’s Hospital in San Antonio, South Austin Medical Center, and Cellular Therapy Program Cell Processing Laboratory @ Methodist Hospital Successfully Survived a Blizzard

Author

Meadors, Sara, primary, Barrera, Jessika, additional, Bedi, Neru, additional, Carr, Stephanie, additional, Collins, Keri, additional, Cruz, Jose C, additional, Dodd, Therese, additional, Elledge, Carole, additional, Flynn, Alma, additional, Garcia, Luis, additional, Ginn, Cody, additional, Hicks, Craig, additional, Hoff, Blake, additional, Horowitz, Justin, additional, Jacunski, Betsy, additional, McIntyre, Amy, additional, Myers, Holly, additional, Ramakrishnan, Aravind, additional, Robles, Robert, additional, Ross, STAR, additional, Scofield, Danielle, additional, Sowell, Hannah, additional, Theis, Crista, additional, Velazquez, Tomeka, additional, Walker, Christine, additional, and Shaughnessy, Paul J., additional

Published
2022
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14. Round Robin Testing: Exploring Experimental Uncertainties through a Multifacility Comparison of a Hinged Raft Wave Energy Converter

Author

Davey, Thomas, primary, Sarmiento, Javier, additional, Ohana, Jérémy, additional, Thiebaut, Florent, additional, Haquin, Sylvain, additional, Weber, Matthieu, additional, Gueydon, Sebastien, additional, Judge, Frances, additional, Lyden, Eoin, additional, O’Shea, Michael, additional, Gabl, Roman, additional, Jordan, Laura-Beth, additional, Hann, Martyn, additional, Wang, Daming, additional, Collins, Keri, additional, Conley, Daniel, additional, Greaves, Deborah, additional, Ingram, David M., additional, and Murphy, Jimmy, additional

Published
2021
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15. The Interaction between Vortices and a Biomimetic Flexible Fin

Author

Brown, Jennifer, Chambers, Lily, Collins, Keri M., Akanyeti, Otar, Visentin, Francesco, Ladd, Ryan, Fiorini, Paolo, Megill, William, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Groß, Roderich, editor, Alboul, Lyuba, editor, Melhuish, Chris, editor, Witkowski, Mark, editor, Prescott, Tony J., editor, and Penders, Jacques, editor

Published
2011
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19. 99 - Keeping Transplant & Cell Therapy Patients Safe during an Emergency - How Sarah Cannon TCT Program @ Methodist Hospital, Methodist Children’s Hospital in San Antonio, South Austin Medical Center, and Cellular Therapy Program Cell Processing Laboratory @ Methodist Hospital Successfully Survived a Blizzard

Author

Meadors, Sara, Barrera, Jessika, Bedi, Neru, Carr, Stephanie, Collins, Keri, Cruz, Jose C, Dodd, Therese, Elledge, Carole, Flynn, Alma, Garcia, Luis, Ginn, Cody, Hicks, Craig, Hoff, Blake, Horowitz, Justin, Jacunski, Betsy, McIntyre, Amy, Myers, Holly, Ramakrishnan, Aravind, Robles, Robert, Ross, STAR, Scofield, Danielle, Sowell, Hannah, Theis, Crista, Velazquez, Tomeka, Walker, Christine, and Shaughnessy, Paul J.

Published
2022
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22. Asymmetries of Flexible Foil Locomotion

Author

Collins, Keri, Bowyer, Adrian, and Megill, William

Subjects
High Energy Physics::Experiment
Abstract

Without asymmetry, locomotion would be impossible. We look at the effects of asymmetry on flexible foils in oscillation and at the role asymmetry plays in thrust production. Asymmetries in time are considered by changing the kinematic profile of an oscillating foil, leading to vectored force production and implicationf for efficiency. The benefits of asymmetry in the flapping profile are shown to be dependent on the physical properties of the fin as well as on the other kinematics parameters.

Published
2009

23. Kinematics and Force Characterisation of a Knifefish-Inspired Mechanical Propulsor

Author

Collins, Keri, Foerster, Felix, Dolan, Stephen, Bowyer, Adrian, and Megill, William

Abstract

The knifefish is a weakly electric eel that propels itself by passing waves along a median fin extending ventrally from jaw to tail. To study the forces generated by this fin, we built an undulating propulsion mechanism that mimics the waves passed along the biological fin using several crank-actuated fin rays. In this paper we explore the forces created by the fin and its performance as a propulsor when mounted on a floating pontoon. Thrust in the fish seems to be improved by increasing the amplitude of the wave as it travels along the body. Using our mechanism we look at the limit of thrust production. We proceed by iterative prototying to optimise the magnitude and along-axis directionality of the mechanism's thrust production.

Published
2008

26. Who Let the Dogs In?

Author

Collins, Keri

Subjects
HISTORIC sites, WATCHDOGS, BURGLARY protection
Abstract

The article focuses on the guard dogs which protect the historic Hearst Castle in California. Security training conducted by the German shepherd Xito and his handler Ranger Dave Graham is described. Some notable features of the estate are discussed. The fondness of the castle's builder, William Randolph Hearst, for his pet dachshund is mentioned.

Published
2003

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