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Articles 151 - 156 of 156
Full-Text Articles in Engineering
Solar And Fuel Cell Circuit Modeling, Analysis And Integrations With Power Conversion Circuits For Distributed Generation, Smitha Krishnamurthy
Solar And Fuel Cell Circuit Modeling, Analysis And Integrations With Power Conversion Circuits For Distributed Generation, Smitha Krishnamurthy
Electronic Theses and Dissertations
Renewable energy is considered to be one of the most promising alternatives for the growing energy demand in response to depletion of fossil fuels and undesired global warming issue. With such perspective, Solar Cells and Fuel Cells are most viable, environmentally sound, and sustainable energy sources for power generation. Solar and Fuel cells have created great interests in modern applications including distributed energy generation to provide clean energy. The purpose of this thesis was to perform a detailed analysis and modeling of Solar and Fuel cells using Cadence SPICE, and to investigate dynamic interactions between the modules and power conversion …
Efficiency Improvement Techniques For High Voltage Capacitor Charging Methods, Michael Islas
Efficiency Improvement Techniques For High Voltage Capacitor Charging Methods, Michael Islas
Electronic Theses and Dissertations
The goal of this thesis is to design and fabricate a DC-to-DC converter for use in high-voltage capacitor charging applications. The primary objectives include increasing the efficiency and reducing the cost of traditional methods used for this application. Traditional methods were not designed specifically for high-voltage capacitor charging and were thus very primitive and exhibited lower efficiency. Prior methods made use of a high voltage power supply and a current limiting resistor or control scheme. The power supply would often only operate efficiently at a single voltage value and would thus function poorly over a range used in charging a …
Integration Of Aln Micromechanical Contour-Mode Technology Filters With Three-Finger Dual Beam Aln Mems Switches, Nipun Sinha, Rashed Mahameed, Chengjie Zuo, Gianluca Piazza
Integration Of Aln Micromechanical Contour-Mode Technology Filters With Three-Finger Dual Beam Aln Mems Switches, Nipun Sinha, Rashed Mahameed, Chengjie Zuo, Gianluca Piazza
Nipun Sinha
In this paper, we present the first demonstration of the monolithic integration of Aluminum Nitride (AlN) micromechanical contour mode technology filters with dual-beam actuated MEMS AlN switches. This integration has lead to the development of the first prototype of a fully-integrated all-mechanical switchable filter. Integration has been demonstrated by using AlN contour-mode MEMS filters at two center frequencies, i.e. 98.7 and 279.9 MHz. The micromechanical switch design used here is a novel three-finger dual-beam topology that improves the isolation and insertion loss of the switch by decreasing the parasitic coupling between the DC and RF signals over a previous AlN …
Body-Biased Complementary Logic Implemented Using Aln Piezoelectric Mems Switches, Nipun Sinha, Timothy S. Jones, Zhijun Guo, Gianluca Piazza
Body-Biased Complementary Logic Implemented Using Aln Piezoelectric Mems Switches, Nipun Sinha, Timothy S. Jones, Zhijun Guo, Gianluca Piazza
Nipun Sinha
This paper reports on the first implementation of low voltage complementary logic (< 1.5 V) by using body-biased aluminum nitride (AlN) piezoelectric MEMS switches. For the first time, by using opposite body biases the same mechanical switch has been made to operate as both an n-type and p-type (complementary) device. Body-biasing also gives the ability to precisely tune the threshold voltage of a switch. The AlN MEMS switches have shown extremely small subthreshold slopes and threshold voltages as low as 0.8 mV/dec and 30 mV, respectively. Furthermore, this work presents a fully mechanical body-biased inverter formed by two AlN MEMS switches operating at 100 Hz with a ± 1.5 V voltage swing.
Ultra Thin Aln Piezoelectric Nano-Actuators, Nipun Sinha, Graham E. Wabiszewski, Rashed Mahameed, Valery V. Felmetsger, Shawn M. Tanner, Robert W. Carpick, Gianluca Piazza
Ultra Thin Aln Piezoelectric Nano-Actuators, Nipun Sinha, Graham E. Wabiszewski, Rashed Mahameed, Valery V. Felmetsger, Shawn M. Tanner, Robert W. Carpick, Gianluca Piazza
Nipun Sinha
This paper reports the first implementation of ultra thin (100 nm) Aluminum Nitride (AlN) piezoelectric layers for the fabrication of vertically deflecting nano-actuators. An average piezoelectric coefficient (d31~ 1.9 pC/N) that is comparable to its microscale counterpart has been demonstrated in nanoscale thin AlN films. Vertical deflections as large as 40 nm have been obtained in 18 μm long and 350 nm thick cantilever beams under bimorph actuation with 2 V. Furthermore, in-plane stress and stress gradients have been simultaneously controlled. Leakage current lower than 2 nA/cm2 at 1 V has been recorded and an average relative dielectric constant of …
Vlsi Implementation Of High Resolution High Speed Low Latency Pipeline Floating Point Adder/Subtractor For Fft Applications, Rozita Teymourzadeh, Burhan Yeop Majlis, Mok Vh, Masuri Othman