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Full-Text Articles in Engineering

Supercapacitor Power Management Module, Michael Brooks, Anderson Fu, Brett Kehoe Jul 2014

Supercapacitor Power Management Module, Michael Brooks, Anderson Fu, Brett Kehoe

Electrical Engineering Senior Theses

The purpose of this senior design project is to create a charge management and output converting power module incorporating an array of supercapacitors as the energy storage medium. Conventional energy storage components, such as lithium-ion batteries, use electrochemical reactions to store and release electrons into a system. These batteries are slow to charge, highly toxic to the environment and delicate compared too many of the systems they are used in. Supercapacitors are noticeably more rugged and last hundreds to thousands of times longer than the average chemical reaction-based batteries we are used to using while capable of charging in less ...


Cubesat Electronic Power System, Benjamin Lynch, Callie Wallace Jun 2014

Cubesat Electronic Power System, Benjamin Lynch, Callie Wallace

Electrical Engineering Senior Theses

Cube Satellites are small satellites used by NASA and other non-governmental space companies as a cost-effective means to get a payload into space to perform research and develop new technologies. The Robotic Systems Lab at Santa Clara University has designed and launched several Cube Satellites over the last ten years. We will be continuing the design of a 3U CubeSat began by a senior design team last year. The goal of this project is to design and build an electronic power system (EPS) for the CubeSat. The EPS must be able to power all system components, including the communication board ...


Wireless Impact Sensing Headband - W.I.S.H., Ryan Daly, Doug Furstinger, Tim Sashegyi, Nicklaus Schmidt, Mihir Shah Jun 2014

Wireless Impact Sensing Headband - W.I.S.H., Ryan Daly, Doug Furstinger, Tim Sashegyi, Nicklaus Schmidt, Mihir Shah

Mechanical Engineering Senior Theses

The prevalence of undiagnosed head injuries in the athletic world, and their associated health risks, is too great to ignore. This is especially true in non-helmeted sports where the availability of impact monitoring technologies is few and far between. In this paper, we discuss our wireless impact sensing headband technology that aids in the awareness and detection of potential concussions, from inception through design completion. Through the use of a custom-built validation system capable of simulating impact collisions, along with a series of experiments and revisions, our team was able to build a device that can sense and transmit data ...


Pb: Project Battery - A Portable In-Home Power System, Devin Blaney, Brian Fahey, Amanda Tran Jun 2014

Pb: Project Battery - A Portable In-Home Power System, Devin Blaney, Brian Fahey, Amanda Tran

Electrical Engineering Senior Theses

Renewable energy resources are abundant in most developing countries. These sources include solar energy, wind power, geothermal energy, and biomass. Even though these sources are readily available, most villages in these developing countries do not have access to power in their homes because electricity grid extensions are often not affordable. This leaves the people in developing countries lacking resources that most of us take for granted here in the US. They don't have access to electrical power and light. This forces the people of these areas to use toxic kerosene lamps, which pollute the environment and increase health issues ...


Greenmission: An Off-Grid Energy System, Richard Dobbins, Andrew Izawa, Tyler Marting, John Nolan Jun 2014

Greenmission: An Off-Grid Energy System, Richard Dobbins, Andrew Izawa, Tyler Marting, John Nolan

Electrical Engineering Senior Theses

In alignment with Santa Clara University's sustainability ideology, the outdoor science school WaldenWest desired to further its students' education through a greenhouse with working electricity. Following greenhouse purchase and assembly, underground wiring for AC, DC and Ethernet lines were sized and installed. A substation was then designed and built in a designated shed, integrating wind turbines and photovoltaics rom past capstone projects. New charge controllers, batteries and circuit breakers were urchased and configured for the system. Worst-case electrical load and solar shading analyses also revealed that these older energy sources were collectively inadequate, so a secondary solar array was ...


Distributed Smart Camera Network For Safety And Security, Nathan Fox, Matthew Kelley, Christopher Rapa, Christopher Yarp Jun 2014

Distributed Smart Camera Network For Safety And Security, Nathan Fox, Matthew Kelley, Christopher Rapa, Christopher Yarp

Interdisciplinary Design Senior Theses

Current CCTV surveillance solutions are generally retrospective tools. Because real time use of CCTV requires human monitors to view a potentially exorbitant number of video feeds, CCTV is usually only useful after an incident has occurred. However, new technologies are making it possible for machines to perform some tasks that previously required a human monitor. The proposed project seeks to augment existing CCTV systems with behavioral analytics. The system uses a series of cameras, FPGAs, and computers to track object movement throughout a facility. This information is used to build a model of normal movement. Object movements are compared against ...


Arsenic Detection Project: Electronics, Anthony Clemetson, John Barth Jun 2014

Arsenic Detection Project: Electronics, Anthony Clemetson, John Barth

Interdisciplinary Design Senior Theses

This project is a collaboration with a team of bioengineers to adapt the functionality of laboratory equipment onto a platform which could be used in the field to determine the concentration levels of toxins in ground water. To this end, using a set of printed electrodes, a device was designed and fabricated with the constraints of field use in mind: low power, low cost, with a mobile user interface. An Android phone served as the mobile user interface, and also as the power supply for the circuit and microcontroller that performed the test. This circuit applied a stimulus voltage across ...


Analysis And Development Of Transcranial Magnetic Stimulation Devices, Lawrence James Crowther Jan 2014

Analysis And Development Of Transcranial Magnetic Stimulation Devices, Lawrence James Crowther

Graduate Theses and Dissertations

Transcranial magnetic stimulation (TMS) is an emerging technique to stimulate neural tissue non-invasively by inducing electric field in the brain with pulsed high-intensity magnetic field. The advantages of stimulating neural tissue in this way have resulted in the technique being rapidly adopted for research and clinical purposes. Advances in the depth and localization of stimulation that TMS can achieve will allow new applications to be established that could replace surgical alternatives. To evaluate the performance of coils used for TMS it is necessary to understand how electric field is induced in neural tissue. To model this phenomenon, numerical methods and ...


Reducing Optical Losses In Organic Photovoltaic Devices Using Microlens Arrays: Theoretical And Experimental Investigation, Yuqing Chen Jan 2014

Reducing Optical Losses In Organic Photovoltaic Devices Using Microlens Arrays: Theoretical And Experimental Investigation, Yuqing Chen

Graduate Theses and Dissertations

Over the last decade, organic photovoltaic (OPV) devices have attracted a lot of attention and highest power conversion efficiencies (PCE) are now close to 10%. However, the performance is still much lower than that in the inorganic photovoltaic devices, like the widely commercialized silicon solar cells. There are many losses that can be contributed to the low efficiencies of OPV devices. Among them, optical loss is a big part, which can account for ~40% of total losses. The incident solar spectrum still largely remains poorly absorbed. In the OPV device structure, the thicknesses (~ 100-200 nm, at times less) are not ...


Transmission Design And Optimization At The National Level, Yifan Li Jan 2014

Transmission Design And Optimization At The National Level, Yifan Li

Graduate Theses and Dissertations

Nowadays, interconnection wide electric transmission system has been envisioned to facilitate the growth of renewable energy, enhance reliability, improve system operating efficiency and reduce greenhouse gas emissions. In this thesis, we articulate an explicit planning framework for high-capacity, inter-regional transmission system design. The study framework begins with generation scenario design, followed by an innovative transmission candidate selection algorithm derived from graph theory applications. Then, a new modeling approach has been introduced to efficiently model the transmission network expansion optimization problem at the interconnection wide level. Global uncertainties have been addressed as well to design a transmission overlay which is robust ...


Biogeography-Based Optimization For Combinatorial Problems And Complex Systems, Dawei Du Jan 2014

Biogeography-Based Optimization For Combinatorial Problems And Complex Systems, Dawei Du

ETD Archive

Biogeography-based optimization (BBO) is a heuristic evolutionary algorithm that has shown good performance on many problems. In this dissertation, three problem1s 1 are researched for BBO: convergence speed and optimal solution convergence of BBO,1 1BBO application to combinatorial problems, and BBO application to complex systems. The first problem is to analyze BBO from two perspectives: how the components of BBO affect its convergence speed and the reason that BBO converges to the optimal solution. For the first perspective, which is convergence speed, we analyze the two essential components of BBO -- population construction and information sharing. For the second perspective ...


Impact Of Sar Image Formation Quality On Target Separability, Cody A. Lawyer Jan 2014

Impact Of Sar Image Formation Quality On Target Separability, Cody A. Lawyer

Browse all Theses and Dissertations

The polar format algorithm (PFA) allows the use of computationally efficient fast Fourier transforms in synthetic aperture radar (SAR) image formation, but introduces phase errors when making the far-field approximations that facilitate this approach. The phase errors cause spatially variant distortion and defocus in the formed image. These effects may complicate target recognition applications. To limit the impact of defocus, scene size is usually limited such that the maximum quadratic phase error within an image falls below some threshold. This thesis looks at how distortion and defocus affects the classification of targets, with the hope of developing an application-driven scene ...


Adaptive I/Q Mismatch Compensation For Wideband Receiver, Linda Zhu Jan 2014

Adaptive I/Q Mismatch Compensation For Wideband Receiver, Linda Zhu

Browse all Theses and Dissertations

Wide working bandwidth is one of the main concerns in digital wideband receiver. The traditional digital receiver covers only one Nyquist zone, which bandwidth range is from DC to half of the sampling frequency. By utilizing in-phase/quadrature (I/Q) channels, wideband receiver is able to double the working bandwidth, which covers from DC to half of the sampling frequency and also from negative half of the sampling frequency to DC. However, I/Q mismatch in reality introduces unwanted signals, which significantly reduce the system performance and the quality of the received signals. In this thesis, an adaptive I/Q ...


Hysteretic Controlled Dc-Dc Converters, Shweta Chauhan Jan 2014

Hysteretic Controlled Dc-Dc Converters, Shweta Chauhan

Browse all Theses and Dissertations

Switched-mode DC-DC converters are widely used in applications requiring step-up and step-down of DC voltages or currents. These converters find their use in portable applications such as laptops and smart phones, radio-frequency power amplifiers, as light emitting diode (LED) drivers, etc. The power converters consist of a switching network, energy storage elements such as inductors and capacitors, and a load resistor. Transformers are used in converters, which require isolation. The switching network comprises of MOSFETs and diodes. With improvement in the VLSI technology, smaller MOSFETs with increased power handling capability are pushing the speed of operation of these power converters ...


16-Bit Digital Adder Design In 250nm And 64-Bit Digital Comparator Design In 90nm Cmos Technologies, Naga Venkata Vijaya Krishna Boppana Jan 2014

16-Bit Digital Adder Design In 250nm And 64-Bit Digital Comparator Design In 90nm Cmos Technologies, Naga Venkata Vijaya Krishna Boppana

Browse all Theses and Dissertations

High speed, low power, and area efficient adders and comparators continue to play a key role in hardware implementation of digital signal processing applications. Adders based on Complimentary Pass Transistor Logic (CPL) are power and area efficient, but are slower compared to Square Root Carry Select (SQRT-CS) based adders. This thesis demonstrates a unique custom designed 16-bit adder in 250-nm CMOS technology to obtain fast and power/area efficient features by combining CPL and CS logic. Comparing the results obtained for proposed 16-bit Linear CPL/CS adder with the BEC (Binary Excess-1 Code) based low power SQRT-CS adder, the delay ...


6 Ghz Rf Cmos Active Inductor Band Pass Filter Design And Process Variation Detection, Shuo Li Jan 2014

6 Ghz Rf Cmos Active Inductor Band Pass Filter Design And Process Variation Detection, Shuo Li

Browse all Theses and Dissertations

A 90nm CMOS active inductor band pass filter with automatic peak detection is demonstrated in this thesis. The active inductor band pass filter has a better performance than the passive band pass filter in on-chip circuit design, due to small area, larger gain and tunable frequency. However, process variation makes the active inductor band pass filter hard to be used widely in many applications. To settle this issue, an automatic voltage peak detector is introduced to detect the process variation direction and hope to be used to control the active inductor band pass filter center frequency and gain. The designed ...


Multi-Finger Mosfet Low Noise Amplifier Performance Analysis, Xiaomeng Zhang Jan 2014

Multi-Finger Mosfet Low Noise Amplifier Performance Analysis, Xiaomeng Zhang

Browse all Theses and Dissertations

Multi-finger layout technique has been extensively used in Nano-scale CMOS circuit design due to the increased circuit performance compared to a single finger layout. However choosing a finger width (W_f) and number of fingers (N_f) to optimize circuit performance is a challenging problem. In this thesis, the performances of 2.4GHz and 6.0GHz single ended low noise amplifiers (LNA) with fixed total transistor widths in 90nm CMOS technology are analyzed as function of number of fingers, bias voltage (V_bias) and channel length (L). The results show that the drain to source current, transconductance and effective gate capacitance increase with ...


Failure Diagnosis And Prognosis In Stochastic Discrete-Event And Cyber-Physical Systems, Jun Chen Jan 2014

Failure Diagnosis And Prognosis In Stochastic Discrete-Event And Cyber-Physical Systems, Jun Chen

Graduate Theses and Dissertations

In this dissertation we study the problem of fault diagnosis in both discrete event systems and cyber physical systems. Discrete event systems (DESs) are event-driven systems with discrete states that evolve in response to abrupt occurrences of discrete changes (called events). The stochastic DESs are used to characterize the quantitative behavior of the system, by modeling the uncertainty on the occurrence of events as random variables with certain distribution. A stochastic DES is similar to the Markov chain models, with the difference being that, in stochastic DESs, the transition is labeled with the event while the event information is omitted ...