21 to 30 of 141 Results
Mar 9, 2014
Badescu, Mircea; Bao, Xiaoqi; Bar-Cohen, Yoseph, 2014, "Shape memory alloy (SMA)-based launch lock", https://hdl.handle.net/2014/45484, SPIE Smart Structures and Non-Destructive Evaluation, San Diego, California, March 9-13, 2014, JPL Open Repository
Most NASA missions require the use of a launch lock for securing moving components during the launch or securing the payload before release. A launch lock is a device used to prevent unwanted motion and secure the controlled components. The current launch locks are based on pyrot... |
Mar 7, 2011
Bao, Xiaoqi; Badescu, Mircea; Bar-Cohen, Yoseph; Lih, Shyh-Shiuh; Sherrit, Stewart; Chang, Zensheu; Chen, Beck; Widholm, Scott; Ostlund, Patrick, 2011, "Sensor for direct measurement of the boundary shear stress in fluid flow", https://hdl.handle.net/2014/41997, 18th Annual International Symposium on Smart Structures/ NDE, San Diego, California, March 7-10, 2011, JPL Open Repository
The formation of scour patterns at bridge piers is driven by the forces at the boundary of the water flow. In most experimental scour studies, indirect processes have been applied to estimate the shear and normal stress using measured velocity profiles. The estimations are based... |
Mar 7, 2011
Bao, Xiaoqi; Badescu, Mircea; Bar-Cohen, Yoseph; Lih, Shyh-Shiuh; Sherrit, Stewart; Chang, Zensheu; Chen, Beck; Widholm, Scott; Ostlund, Patrick, 2011, "Sensor for direct measurement of the boundary shear stress in fluid flow", https://hdl.handle.net/2014/43464, Proceedings of the Smart Structures Symposium, San Diego, California, March 6-10, 2011., JPL Open Repository
The formation of scour patterns at bridge piers is driven by the forces at the boundary of the water flow. In most experimental scour studies, indirect processes have been applied to estimate the shear and normal stress using measured velocity profiles. The estimations are based... |
Mar 22, 2021
Bar-Cohen, Yoseph; Badescu, Mircea; Lee, Hyeong Jae; Sherrit, Stewart; Bao, Xiaoqi; Shirajian, Nareg, 2021, "Sample Return Containerization and Planetary Protection Using Brazing for Breaking the Chain of Contact to Mars", https://hdl.handle.net/2014/54429, SPIE Smart Structures + Nondestructive Evaluation 2021, Long Beach, California, March 22-26, 2021, JPL Open Repository
Planetary protection of Mars samples returned to Earth in a future NASA mission is a critical part of preventing uncontrolled biological materials being released from the samples. The planetary protection process requires addressing the potential risks and would involve “breaking... |
Mar 3, 2019
Bar-Cohen, Yoseph; Badescu, Mircea; Sherrit, Stewart; Bao, Xiaoqi; Lee, Hyeong Jae; Bombela, Erik; Sandhu, Sukhwinder, 2019, "Sample containerization and planetary protection using brazing for breaking the chain of contact to Mars", https://hdl.handle.net/2014/50668, SPIE Smart Structures, Denver, Colorado, March 3-7, 2019, JPL Open Repository
The process consists of two-steps, where one is intended to be prepared on Earth and the second would be executed on orbit around Mars. The latest results of this study will be described and discussed. |
Mar 3, 1997
Lih, Shyh-Shiuh; Bar-Cohen, Yoseph, 1997, "Rotary Ultrasonic Motors Actuated by Traveling Flexural Waves", https://hdl.handle.net/2014/21826, San Diego, California, USA, JPL Open Repository
Ultrasonic rotary motors are being developed as acutators for miniature spacecraft insturments and subsystems. The technology that has emerged in commercial products requires rigorous analytical tools for effective design of such motors. An analytical model was developed to exami... |
Mar 13, 2006
Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu; Sherrit, Stewart; Badescu, Mircea, 2006, "Rock Sampling using the Ultrasonic/Sonic Driller/Corer (USDC) for in-situ planetary exploration", https://hdl.handle.net/2014/38924, 35th Annual Ultrasonic Industry Association (UIA) Symposium, San Diego, California, March 13-14, 2006, JPL Open Repository
No abstract provided |
Mar 1, 2004
Sherrit, Stewart; Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu, 2004, "Resonance analysis of high temperature piezoelectric materials for actuation and sensing", https://hdl.handle.net/2014/38241, SPIE Smart Structures and Materials, San Diego, CA, March 15-18, 2004, JPL Open Repository
The current NASA Decadal mission planning effort has identified Venus as a significant scientific target for a surface in-situ sampling mission. |
Mar 5, 2001
Bar-Cohen, Yoseph; Bao, Xiaoqi; Dolgin, Benjamin; Marzwell, Neville, 2001, "Residue detection for real-time removal of paint from metallic surfaces", https://hdl.handle.net/2014/39308, 8th Annual International Symposium on Smart Structures, Newport Beach, California, March 5-8, 2001., JPL Open Repository
Paint stripping from large steel ships and other metallic surfaces is a major issue in the maintenance and refurbishing of structures, and environmental concerns are greatly limiting the possible options. As a result, waterjet with water recycling has become the leading form of p... |
Mar 7, 2010
Bar-Cohen, Yoseph, 2010, "Refreshable Braille displays using EAP actuators", https://hdl.handle.net/2014/44786, 12th SPIE Conference - Electroactive Polymer Actuators and Devices(EAPAD), San Diego, California, March 7-11, 2010, JPL Open Repository
Refreshable Braille can help visually impaired persons benefit from the growing advances in computer technology. The development of such displays in a full screen form is a great challenge due to the need to pack many actuators in small area without interferences. In recent years... |
