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Your search keyword '"Mahajan, R. L."' showing total 144 results
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144 results on '"Mahajan, R. L."'

6. Forced convection in high porosity metal foams

Author

Calmidi, V. V. and Mahajan, R. L.

Subjects
Porous materials -- Thermal properties, Porous materials -- Research, Heat -- Convection, Heat -- Research, Engineering and manufacturing industries, Science and technology
Abstract

An experimental and numerical study of forced convection in high porosity metal foams is presented. The study is conducted to quantify thermal dispersion and thermal nonequilibrium effects in metal foams and results indicate that for foam-air combinations, the transport enhancing effect of thermal dispersion is extremely low due to the relatively high conductivity of the solid matrix.

Published
2000

7. Alternative Curing Methods for FCOB Underfill

Author

Merton, M. M., Malhotra, C. P., Nikmanesh, N., and Mahajan, R. L.

Subjects
Electronic packaging -- Analysis, Condensers (Vapors and gases) -- Analysis, Heat-transfer media -- Analysis, Materials -- Fatigue, Electronics
Abstract

This paper explores the use of liquid immersion and vapor condensation curing as alternatives to conventional hot air oven curing of flip chip on board underfill. Heat transfer results suggest that both the liquid immersion and vapor condensation heating result in reduced cure times due to higher heat transfer results associated with these two techniques. Preliminary reliability studies suggest that the two proposed rapid curing methods do not result in any increased failure rates or different failure mechanisms. In almost ail the samples the failure mode was delamination of the underfill followed by solder fatigue failure.

Published
1999

10. ICTAS at NCR: VT-Serge meeting

Author

Mahajan, R. L.

Subjects
Virginia Polytechnic Institute and State University -- Research, Technological innovations, Interdisciplinary research
Published
2011

11. AEP Talk for ICTAS-AEP Luncheon

Author

Mahajan, R. L.

Subjects
Virginia Polytechnic Institute and State University -- Research, Technological innovations, Interdisciplinary research
Published
2011

12. 2010 Doctoral Scholars Reception Presentation

Author

Mahajan, R. L.

Subjects
Doctoral students, Virginia Polytechnic Institute and State University -- Graduate students
Abstract

Features an introduction to ICTAS and introduces doctoral scholars from each year.

Published
2010

14. IDRI

Author

Mahajan, R. L.

Subjects
Technological innovations, Interdisciplinary research, Disruptive technologies, Renewable energy sources
Abstract

Delivered at Electronic Materials and Applications 2011 Conference, The American Ceramic Society January 20, 2010

Published
2010

15. 2009 Doctoral Scholars Presentation Ceremony

Author

Mahajan, R. L.

Subjects
Doctoral students, Virginia Polytechnic Institute and State University -- Graduate students
Abstract

Features students from each college and "ICTAS Expectations of Doctoral Scholars"

Published
2009

20. Frequency-dependent stability of parallel-plate electrostatic actuators in conductive fluids

Author

Sounart, T. L., Panchawagh, H. V., Mahajan, R. L., Sounart, T. L., Panchawagh, H. V., and Mahajan, R. L.

Abstract

We present an electromechanical stability analysis of passivated parallel-plate electrostatic actuators in conductive dielectric media and show that the pull-in instability can be eliminated by tuning the applied frequency below a design-dependent stability limit. A partial instability region is also obtained, where the actuator jumps from the pull-in displacement to another stable position within the gap. The results predict that the stability limit is always greater than the critical actuation frequency, and therefore any device that is feasible to actuate in a conductive fluid can be operated with stability over the full range of motion. (C) 2010 American Institute of Physics. [doi:10.1063/1.3389491]

Published
2010
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22. Laser-induced exfoliation of amorphous carbon layer on an individual multiwall carbon nanotube

Author

Singh, G., Rice, P., Hurst, K. E., Lehman, John H., Mahajan, R. L., Singh, G., Rice, P., Hurst, K. E., Lehman, John H., and Mahajan, R. L.

Abstract

Pulsed laser treatment of an individual multiwall carbon nanotube induced selective exfoliation of the amorphous carbon contamination layer. The multiwall carbon nanotube (MWCNT) was exposed to a 248 nm excimer laser. After the treatment, transmission electron microscopy images show that the amorphous layer has expanded and separated from the crystalline MWCNT walls. This interesting observation has implications for laser cleaning and possible thinning of MWCNTs to reduce the radial dimensions. (C) 2007 American Institute of Physics.

Published
2007
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