1 to 10 of 141 Results
Mar 7, 2005
Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu; Sherrit, Stewart; Badescu, Mircea, 2005, "Wirelessly controllable inflated electroactive polymer (EAP) reflectors", https://hdl.handle.net/2014/41476, Electroactive Polymer Actuators and Devices (EAPADI ) Conference, Smart Structures and Materials Symposium, San Diego, California, March 7-10, 2005, JPL Open Repository
Inflatable membrane reflectors are attractive for deployable, large aperture, lightweight optical and microwave systems in micro-gravity space environment. However, any fabrication flaw or temperature variation may results in significant aberration of the surface. Even for a perf... |
Mar 9, 2014
Lee, Hyeong Jae; Bar-Cohen, Yoseph; Lih, Shyh-Shiuh; Badescu, Mircea; Dingizian, Arsham; Takano, Nobuyuki; Blosiu, Julian O., 2014, "Wireless monitoring of the height of condensed water in steam pipes", https://hdl.handle.net/2014/45483, SPIE Smart Structures and Non-Destructive Evaluation, San Diego, California, March 9-13, 2014, JPL Open Repository
A wireless health monitoring system has been developed for determining the height of water condensation in the steam pipes and the data acquisition is done remotely using a wireless network system. The developed system is designed to operate in the harsh environment encountered a... |
Nov 27, 1996
Mal, Ajit; Guo, Dawei; Bar-Cohen, Yoseph; Lih, Shyh-Shiuh, 1996, "Wave Propagation in Anisotropic Composite Plates", https://hdl.handle.net/2014/27348, Nara, Japan, JPL Open Repository
This paper is concerned with the development of wave propagation based cost-effective ultrasonic techniques for the nondestructive materials and defects characterization in advanced structural composites. A theoretical model that captures the most significant features of wave phe... |
Mar 5, 2001
Bar-Cohen, Yoseph; Mavroidis, Constantinos; Bouzit, Mourad; Dolgin, Benjamin; Harm, Deborah L.; Kopchok, George E.; White, Rodney, 2001, "Virtual reality robotic telesurgery simulations using MEMICA haptic system", https://hdl.handle.net/2014/39307, 8th Annual International Symposium on Smart Structures, Newport Beach, California, March 5-8, 2001., JPL Open Repository
The authors conceived a haptic mechanism called MEMICA (Remote Mechanical Mirroring using Controlled stiffness and Actuators) that can enable the design of high dexterity, rapid response, and large workspace haptic system. The development of a novel MEMICA gloves and virtual real... |
Feb 27, 2006
Bao, Xiaoqi; Bar-Cohen, Yoseph; Chang, Zensheu; Sherrit, Stewart; Badescu, Mircea, 2006, "USDC based rapid penetrator of packed soil", https://hdl.handle.net/2014/38888, Smart Structures and Materials Symposium, San Diego, California, February 27, 2006., JPL Open Repository
Environment protection requires more testing and analysis tools. To detect buried chemical containers or other objects embedded in soil and avoid possible damages of them, a penetrator of packed soil operated using low pushing force was developed. The design was based on a novel... |
Mar 5, 2001
Bar-Cohen, Yoseph; Sherrit, Stewart; Dolgin, Benjamin P.; Bao, Xiaqi; Chang, Zensheu; Pal, Dharmendra S.; Du, Shu; Peterson, Thomas, 2001, "Ultrasonic/sonic drilling/coring (USDC) for planetary applications", https://hdl.handle.net/2014/39263, 8th Annual International Symposium on Smart Structures, Newport Beach, California, March 5-8, 2001., JPL Open Repository
One of the major limitations of sampling on Mars and other low gravity environments is the need for high axial force when using conventional drilling. To address this limitation an ultrasonic/sonic drilling/coring (USDC) mechanism has been developed that employs an ultrasonic hor... |
Jun 27, 2006
Bar-Cohen, Yoseph; Sherrit, Stewart; Bao, Xiaoqi; Badescu, Mircea; Aldrich, Jack; Chang, Zensheu, 2006, "Ultrasonic/sonic driller/corer (USDC) as a subsurface sampler and sensors platform for planetary exploration applications", https://hdl.handle.net/2014/39725, 4th International Planetary Probe Workshop, Pasadena, California, June 27-30, 2006., JPL Open Repository
The search for existing or past life in the Universe is one of the most important objectives of NASA’s mission. For this purpose, effective instruments that can sample and conduct in-situ astrobiology analysis are being developed. In support of this objective, a series of novel m... |
Mar 7, 2010
Bao, Xiaoqi; Bar-Cohen, Yoseph; Scott, James; Sherrit, Stewart; Widholm, Scott; Badescu, Mircea, 2010, "Ultrasonic/sonic drill for high temperature application", https://hdl.handle.net/2014/44789, 12th SPIE Conference - Electroactive Polymer Actuators and Devices(EAPAD), San Diego, California, March 7-11, 2010, JPL Open Repository
Venus is one of the many significant scientific targets for NASA. New rock sampling tools with the ability to be operated at high temperatures of the order of 460°C are required for surface in-situ sampling/analysis missions. Piezoelectric materials such as LiNbO₃ crystals and Bi... |
Jul 31, 1994
Lih, Shyh-Shiuh; Mal, Ajit K.; Bar-Cohen, Yoseph, 1994, "Ultrasonic Evaluation of Thermal Degradation in Adhesive Bonds", https://hdl.handle.net/2014/33064, Snowmass Village, CO, JPL Open Repository
The critical role played by adhesive bonds in lap joints is well known. A good knowledge of the mechanical properties of adhesive bonds in lap joints is a prerequisite to the design and reliable prediction of the performance of these bonded structures. Furthermore, the lap joint... |
Mar 8, 2009
Bao, Xiaoqi; Bar-Cohen, Yoseph; Sherrit, Stewart; Badescu, Mircea; Louyeh, Sahar, 2009, "Transport powder and liquid samples by surface acoustic waves", https://hdl.handle.net/2014/44651, 2009 SPIE Conference on Smart Structures and Materials, San Diego, California, March 8-12, 2009, JPL Open Repository
Sample transport is an important requirement for In-situ analysis of samples in NASA planetary exploration missions. Tests have shown that powders or liquid drops on a surface can be transported by surface acoustic waves (SAW) that are generated on the surface using interdigital... |
