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Fabrication of Three-Dimensionally Independent Microchannels Using a Single Mask Aimed at On-Chip Microprocessor Cooling
(Virginia Tech, 2007-11-28)
A novel fabrication process is presented which allows for three-dimensionally independent features to be etched in silicon using SF6 gas in a deep reactive ion etcher (DRIE) after a single etch step. The mechanism allowing ...
Cold-start effects on performance and efficiency for vehicle fuel cell systems
(Virginia Tech, 2002-12-12)
In recent years government, academia and industry have been pursuing fuel cell technology as an alternative to current power generating technologies. The automotive industry has targeted fuel cell technology as a potential ...
Optimized Sythesis of a Force Generating Planar Four-Bar Mechanism Including Dynamic Effects
(Virginia Tech, 2001-11-28)
This thesis presents a technique for designing planar four-bar linkages by coupling optimization, dynamics and kinematics. This synthesis technique gives the designer the ability to design linkages having a desired resistance ...
The Design, Fabrication, and Modeling of a Piezoelectric Linear Motor
(Virginia Tech, 2001-12-19)
The focus of this research was to create a linear motor that could easily be packaged and still perform the same task of the current DC motor linear device. An incremental linear motor design was decided upon, for its ...
Lateral and Posterior Dynamic Bending of the Mid-Shaft Femur: Fracture Risk Curves for the Adult Population
(Virginia Tech, 2004-04-22)
The purpose of this study was to develop injury risk functions for dynamic bending of the human femur in the lateral-to-medial and posterior-to-anterior loading directions. A total of 45 experiments were performed on human ...
The Music Muse
(Virginia Tech, 1996-11-01)
Ever wonder why two people can sing the same note with the same loudness, but sound completely different? Middle C is middle C no matter who sings it, yet for some reason Lucianno Pavarotti1s middle C sounds richer and ...
Flow and Thermal Field Measurements in a Combustor Simulator Relevant to a Gas Turbine Aero-Engine
(Virginia Tech, 2002-11-22)
<p>The highly competitive gas turbine industry has been motivated by consumer demands for higher power-to-weight ratios, increased thermal efficiencies, and reliability while maintaining affordability. In its continual ...
Mass Properties Calculation and Fuel Analysis in the Conceptual Design of Uninhabited Air Vehicles
(Virginia Tech, 2003-12-01)
The determination of an aircraft's mass properties is critical during its conceptual design phase. Obtaining reliable mass property information early in the design of an aircraft can prevent design mistakes that can be ...
Transient Model of Heat,Mass,and Charge transfer as well as Electrochemistry in the Cathode Catalyst Layer of a PEMFC
(Virginia Tech, 2001-12-17)
A transient model of the cathode catalyst layer of a proton exchange membrane fuel cell is presented. The catalyst layer structure can be described as a superposition of the polymer membrane, the backing layer, and some ...
Evaluation of a Strut-Plasma Torch Combination as a Supersonic Igniter-Flameholder
(Virginia Tech, 2004-02-23)
As the flight speeds of aircraft are increased above Mach 5, efficient methods of propulsion are needed. Scramjets may be a solution to this problem. Supersonic combustion is one of the main challenges involved in the ...