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Articles 631 - 660 of 717
Full-Text Articles in Engineering
Investigations On Commercially Available Mgopsz Electrolytes With Y2O3 Fsz Coating For Low Oxygen Determination In Liquid Steel, Kevin Huang, Yuhua Xia, Weijiang Wu, Qingguo Liu, Wen Liu
Investigations On Commercially Available Mgopsz Electrolytes With Y2O3 Fsz Coating For Low Oxygen Determination In Liquid Steel, Kevin Huang, Yuhua Xia, Weijiang Wu, Qingguo Liu, Wen Liu
Kevin Huang
No abstract provided.
A Novel Solid Oxide Redox Flow Battery For Grid Energy Storage, Nansheng Xu, Xue Li, Xuan Zhao, John B. Goodenough, Kevin Huang
A Novel Solid Oxide Redox Flow Battery For Grid Energy Storage, Nansheng Xu, Xue Li, Xuan Zhao, John B. Goodenough, Kevin Huang
Kevin Huang
In this work we report proof-of-concept of a novel redox flow battery consisting of a solid oxide electrochemical cell (SOEC) integrated with a redox-cycle unit. The charge/discharge characteristics were explicitly observed by operating between fuel cell and electrolysis modes of the SOEC along with “in-battery” generation and storage of H2 realized by an in situ closed-loop reversible steam-metal reaction in the redox-cycle unit. With Fe/FeO as the redox materials, the new storage battery can produce an energy capacity of 348 Wh/kg-Fe and round-trip efficiency of 91.5% over twenty stable charge/discharge cycles. This excellent performance combined with robustness, environmental friendliness …
P–N Heterojunction On Ordered Zno Nanowires/Polyaniline Microrods Double Array, Qunwei Tang, Lin Lin, Xuan Zhao, Kevin Huang, Jihuai Wu
P–N Heterojunction On Ordered Zno Nanowires/Polyaniline Microrods Double Array, Qunwei Tang, Lin Lin, Xuan Zhao, Kevin Huang, Jihuai Wu
Kevin Huang
No abstract provided.
Atomic Layer Deposition Functionalized Composite Sofc Cathode La0.6Sr0.4Fe0.8Co0.2O3-Δ -Gd0.2Ce0.8O1.9: Enhanced Long-Term Stability, Yunhui Gong, Rajankumar Patel, Xinhua Liang, Diego Palacio, Xueyan Song, John Goodenough, Kevin Huang
Atomic Layer Deposition Functionalized Composite Sofc Cathode La0.6Sr0.4Fe0.8Co0.2O3-Δ -Gd0.2Ce0.8O1.9: Enhanced Long-Term Stability, Yunhui Gong, Rajankumar Patel, Xinhua Liang, Diego Palacio, Xueyan Song, John Goodenough, Kevin Huang
Kevin Huang
No abstract provided.
Can Silver Be A Reliable Current Collector For Electrochemical Tests?, Yunhui Gong, Changyong Qin, Kevin Huang
Can Silver Be A Reliable Current Collector For Electrochemical Tests?, Yunhui Gong, Changyong Qin, Kevin Huang
Kevin Huang
The true functionality of a current collector employed in electrochemical cells is to ensure a low- resistance steady electrons flow between the cell and instrumentation without involving in any local electrochemical reactions of the electrode. In this study, we investigated the effect of curing temperature of a common current collector, silver, on the polarization area specific resistance (ASR) of a cathode. The results explicitly showed that at least one order of magnitude lower ASR for a cathode with Ag cured at 800°C than that cured at 650°C of the same cathode configuration. Microscopic analysis of the 800°C-cured cells revealed a …
Mixed Conductors For Electrochemical Co2 Separation, Nansheng Xu, Lingling Zhang, Hailei Zhao, Kevin Huang
Mixed Conductors For Electrochemical Co2 Separation, Nansheng Xu, Lingling Zhang, Hailei Zhao, Kevin Huang
Kevin Huang
One of the major concerns of consuming fossil fuels to produce useful form of energy is the emission of CO2, a greenhouse gas that can cause climate change and ultimately threaten the survival of humanity. Controlling CO2-emission is an urgent but the only practical solution to stabilize CO2 concentration in the atmosphere. In this paper, we report our effort to capture CO2 from a simulated flue gas by utilizing a dual-phase mixed electron and carbonate-ion conducting (MECC) membrane. The obtained CO2 flux density is the highest among the published dual-phase carbonate systems. These results demonstrate the Ag-MC dual-phase composite as …
Gaze Controlled Human-Computer Interface, Steve Petkovsek, Kevin Huang, Binay Poudel
Gaze Controlled Human-Computer Interface, Steve Petkovsek, Kevin Huang, Binay Poudel
Kevin Huang
The goal of the Gaze Controlled Human Computer Interface project is to design and construct a non-invasive gaze-tracking system that will determine where a user is looking on a computer screen in real time. To accomplish this, a fixed illumination source consisting of Infrared (IR) Light Emitting Diodes (LEDs) is used to produce corneal reflections on the user’s eyes. These reflections are captured with a video camera and compared to the relative location of the user’s pupils. From this comparison, a correlation matrix can be created and the approximate location of the screen that the user is looking at can …
Effective Ionic Conductivity Of A Novel Intermediate-Temperature Mixed Oxide-Ion And Carbonate-Ion Conductor, Xue Li, Guoliang Xiao, Kevin Huang
Effective Ionic Conductivity Of A Novel Intermediate-Temperature Mixed Oxide-Ion And Carbonate-Ion Conductor, Xue Li, Guoliang Xiao, Kevin Huang
Kevin Huang
A systematic investigation on the effective ionic conductivity (σm) of a novel intermediate-temperature mixed oxide-ion and carbonate-ion conductor MOCC consisting of a ceria phase and a carbonate phase is reported. The study explicitly shows that the observed remarkable temperature-dependent σm is primarily the result of softening/melting of the carbonate phase as the physical state of the carbonate phase transforms from solid, softened to molten. Differential scanning calorimetry analysis complements the understanding of the observed electrical behavior by revealing temperatures of melting and solidification in agreement with the onset temperatures of σm. In addition, the measured σmagrees reasonably well with that …
Fuel Cells With Doped Lanthanum Gallate Electrolyte, Man Feng, John Goodenough, Kevin Huang, Christopher Milliken
Fuel Cells With Doped Lanthanum Gallate Electrolyte, Man Feng, John Goodenough, Kevin Huang, Christopher Milliken
Kevin Huang
No abstract provided.
Synthesis Of A Homogeneously Porous Solid Oxide Matrix With Tunable Porosity And Pore Size, Lingling Zhang, Zhengping Mao, James Thomason, Siwei Wang, Kevin Huang
Synthesis Of A Homogeneously Porous Solid Oxide Matrix With Tunable Porosity And Pore Size, Lingling Zhang, Zhengping Mao, James Thomason, Siwei Wang, Kevin Huang
Kevin Huang
No abstract provided.
Oxygen Permeation Through Cobalt-Containing Perovskites: Surface Oxygen Exchange Vs. Lattice Oxygen Diffusion, Kevin Huang, John B. Goodenough
Oxygen Permeation Through Cobalt-Containing Perovskites: Surface Oxygen Exchange Vs. Lattice Oxygen Diffusion, Kevin Huang, John B. Goodenough
Kevin Huang
The oxygen permeation fluxes from p′O2 to pnO2 (p′O2>pnO2) across cobalt-containing perovskite ceramic membranes La1−xSrxCoO3−δ and SrCo0.8Fe0.2O3−δ were measured by gas chromatography as functions of oxygen chemical potential gradient, temperature, thickness, and catalytic activity on the surface. Power indexes 0.5>n>0 for uncatalyzed La1−xSrxCoO3−δ and 1>n>0.5 for SrCo0.8Fe0.2O3−δ were obtained when JO2 vs. p′nO2−p'′nO2 …
Methods For Determining Grease Service Levels In An Ah-64d Intermediate Gearbox Using On-Board Sensors, Travis Steven Edwards
Methods For Determining Grease Service Levels In An Ah-64d Intermediate Gearbox Using On-Board Sensors, Travis Steven Edwards
Theses and Dissertations
The intermediate gearbox (IGB) on the AH-64D was chosen as the subject for this study based on the persistent grease leaks that require grounding aircraft. The aircraft is not currently equipped with a method of detecting grease loss during flight, so techniques for analyzing the usefulness of old metrics and possible new techniques can be tested. The main objective of this study is to use the aircraft’s on-board sensors to develop a method of determining the lubrication level of the IGB. Currently, the most reliable method for detecting a fault on the aircraft is through the use of vibration-based condition …
Snowboard, Ski, And Skateboard Sensor System Application, Adrien Doiron, Michael Fernandez, Victor Ojeda, Robert Ross
Snowboard, Ski, And Skateboard Sensor System Application, Adrien Doiron, Michael Fernandez, Victor Ojeda, Robert Ross
Mechanical Engineering Senior Theses
The goal of this project was develop a sensor for the commercial market for skiers, snowboarders, and skateboarders that can give them the data such as speed, elevation, pressure, temperature, flex, acceleration, position, and other performance data such as trick characterization. This was done by using a variety of sensors, including a GPS, flex sensors, accelerometer, and others to provide data such as speed, position, position, and temperature. The sensors were placed in an external polycarbonate casing attached to the ski or board by using an adhesive pad on the bottom of the casing. These sensors then transmit the data …
Workspace Analysis Of A Linear Delta Robot: Calculating The Inscribed Radius, Michael Louis Pauly
Workspace Analysis Of A Linear Delta Robot: Calculating The Inscribed Radius, Michael Louis Pauly
Graduate Theses - Mechanical Engineering
One of the most important traits of a robotic manipulator is its work envelope, the space in which the robot can position its end effector. Parallel manipulators, while generally faster, are restricted by smaller work envelopes [1]. As such, understanding the parameters defining a physical robot’s work envelope is essential to the optimal design, selection, and use of robotic parallel manipulators. A Linear Delta Robot (LDR) is a type of parallel manipulator in which three prismatic joints move separate arms which connect to a single triangular end plate [2]. In this study, general inverse kinematics were derived for a linear …
Induction Phone Charger Case, Dante Eley, Nicholas Mason, Laurence Pringle
Induction Phone Charger Case, Dante Eley, Nicholas Mason, Laurence Pringle
Mechanical Engineering Senior Theses
This report discusses the project of creating a manual charging phone case for smartphones by means of electromagnetic induction. In today's world, smartphones are being used on the go more often, creating an increased demand for battery life. The capacity of current batteries cannot keep up with the constant usage of data in such activities as emailing, social media, apps, and more. We developed an efficient, ergonomic, and aesthetically pleasing phone case that can manually charge a smartphone without an electrical outlet, but by means of electromagnetic induction. This product would target two main demographics: business people who are constantly …
Aeroponic Test Bed For Hypergravity Research, Shane Brunner, Theron Hawley, Mike Nichols, David Patzelt, Kurt Sprouse
Aeroponic Test Bed For Hypergravity Research, Shane Brunner, Theron Hawley, Mike Nichols, David Patzelt, Kurt Sprouse
Mechanical Engineering Senior Theses
Taking one pound of food to space costs over $10,000. A plant growth chamber in space would help reduce the cost of transporting food by creating a healthy, long-term source of food that can be used for extended space missions. Currently, there is a lack of knowledge in gravity response mechanisms of plants to facilitate employing such a system. The overarching goal of this project is to add to the current body of knowledge related to growing plants in space by conducting research regarding the effect of hypergravity on cherry belle radish growth. To successfully accomplish this goal, an aeroponic …
Swing Wing Aerial Drone (Swad), Chris Barton, Robert Gomez, Matt Kochalko, Kyle Nakagaki
Swing Wing Aerial Drone (Swad), Chris Barton, Robert Gomez, Matt Kochalko, Kyle Nakagaki
Mechanical Engineering Senior Theses
Drones are unmanned aerial vehicles that have a variety of different applications in the field. Drones are very helpful for first responders such as firefighters, police, and even ranchers and large landowners. Most drones have a fixed wing. This report will show the design, construction, and fluid dynamic testing of a drone that has multiple wing positions. These modes are the straight wing position and swept back position. This design will change the flight profile of the plane, allowing for the user to launch at a faster speed and the glider to get to the desired location faster. Once the …
Vex Robotics, Ho Joon Cha, Joshua Del Real, Jamie Kalb, Thomas Nance, Jenny Yang
Vex Robotics, Ho Joon Cha, Joshua Del Real, Jamie Kalb, Thomas Nance, Jenny Yang
Mechanical Engineering Senior Theses
The objective of our project was to design and construct a control system for communication between two autonomous robots, of different size and capabilities, in an environment with numerous obstacles and challenges. These challenges, completed autonomously, involved moving over and under barriers along with the obtainment and transportation of spherical objects. Our project was tied to the VEX Robotics competition environment as we tested our robots by competing at the World Championships. Unfortunately, due to time and budget considerations, we had to scale back our sensor subsystem. This led to a simpler control system than originally intended; however, we were …
Solar Absorption Chiller, Craig Carlson, Mark Coulter, Claire Kunkle, Patrick Watson
Solar Absorption Chiller, Craig Carlson, Mark Coulter, Claire Kunkle, Patrick Watson
Mechanical Engineering Senior Theses
In developing nations access to electricity is inconsistent at best, and food spoilage is a prevalent issue. The solar powered absorption chiller is a refrigeration system designed to provide refrigeration to these developing areas. This year, our team has worked to develop a system where the sun's rays are collected as heat to power an absorption refrigerator. The goal of this project was to take an existing solar tracker system and use its collected heat to power a refrigerator. Our team designed and built heat exchangers to extract heat from the concentrated solar system; assembled components for a fluid circulation …
The Poverty Crusher, Rob Golterman, Brian Hammond, Thien-Ryan Le, Arvin Lie
The Poverty Crusher, Rob Golterman, Brian Hammond, Thien-Ryan Le, Arvin Lie
Mechanical Engineering Senior Theses
The Poverty Crusher team built a human-powered rock breaking device for the women in Nepal who make $1.50 - $3 per day crushing rocks. A prototype jaw-type rock crusher was designed and built over a period of several months. However, the device was unable to break rocks due to excessive bending in the connection points of the frame and in the crushing faces. Improvements were suggested for the next prototype, which include increasing the second moment of inertia of the crushing faces, using a welded frame, and generally decreasing the cost and weight of the device.
Wireless Impact Sensing Headband - W.I.S.H., Ryan Daly, Doug Furstinger, Tim Sashegyi, Nicklaus Schmidt, Mihir Shah
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 …
Benchtop Centrifuge For Materials Science, Jose Lizheno, Nathaniel Tseng, Ryan Tsuzaki
Benchtop Centrifuge For Materials Science, Jose Lizheno, Nathaniel Tseng, Ryan Tsuzaki
Mechanical Engineering Senior Theses
The Benchtop centrifuge for materials science was designed to be a versatile, cost-effective, user-friendly and safe centrifuge for the university setting. While a prototype was not completed due to running out of time for assembly, various forms of analysis were conducted including Natural Frequency Analysis and Finite Element Analysis. The team hopes that the work completed will provide a useful starting point for other teams that may wish to continue the project in the future.
Akabot: 3d Printing Filament Extruder, Emily Albi, Kevin Kozel, Daniel Ventoza, Rachel Wilmoth
Akabot: 3d Printing Filament Extruder, Emily Albi, Kevin Kozel, Daniel Ventoza, Rachel Wilmoth
Mechanical Engineering Senior Theses
3D printing could usher in a new age of localized manufacturing in places like Uganda, where three of our senior design team members spent the summer of 2013. Motivated by a concept for our senior design project, one of our team members interned with Village Energy, a small electronics business in Kampala, Uganda, as it piloted the use of a 3D printer to manufacture enclosures for its solar lights. The need for our project arose when we realized that although the 3D printer proved a viable method of manufacturing enclosures, Village Energy could not afford to continue 3D printing with …
Automated Precision Passing System, Bryan Herrera, David Savitz, Mikiah Raffaeli
Automated Precision Passing System, Bryan Herrera, David Savitz, Mikiah Raffaeli
Mechanical Engineering Senior Theses
Athletes are always seeking ways to improve their performance. Down time and a lack of capable throwers prevent athletic receivers from practicing their skills. We hope to aid athletes in receiving drills within their respective sports and increase practice efficiency. In order to achieve this, the machine has one major axis of rotation driven by a motor. This enables it to adjust where the ball is being thrown. Using an Arduino Uno coupled with a Roboteq AX1500 motor driver, the Automated Precision Passing System is able to throw a ball to a specified point in space by adjusting both the …
Santa Clara University Human Powered Vehicle 2013-2014, Peter Chester, Luis Flores, Ian Jones, Ryan Nakamura, Dylan Porter, Peter Stephens
Santa Clara University Human Powered Vehicle 2013-2014, Peter Chester, Luis Flores, Ian Jones, Ryan Nakamura, Dylan Porter, Peter Stephens
Mechanical Engineering Senior Theses
This document discusses the conceptual design for the 2013-2014 Santa Clara University Human Powered Vehicle. The objective of the Santa Clara University Human Powered Vehicle team is to design and manufacture a human powered vehicle that is practical, sustainable, and efficient. Key design features include a partial body fairing, tilt and ackermann steering, and cargo space. Ultimately we had to block out the tilt steering because its operation conflicted with the Ackermann steering. This vehicle's design satisfies the primary needs of a commuter and ultimately serves as a practical alternative to an automobile. Finally, this design complies with the requirements …
Rsl Rover: Robotic Systems Laboratory Rugged Offroad Vehicle For Experimental Research, Garrett Bonner, Owen Hale, Julian Pitt, Andrew Torrellas
Rsl Rover: Robotic Systems Laboratory Rugged Offroad Vehicle For Experimental Research, Garrett Bonner, Owen Hale, Julian Pitt, Andrew Torrellas
Mechanical Engineering Senior Theses
The goal of this project was to build an autonomous vehicle testbed for the Robotics Systems Laboratory. This testbed will be used by undergraduate, graduate, and faculty researchers to test different control methods, sensor combinations, vehicle control laws, and eventually autonomous navigation. This paper documents our accomplishments to achieve this goal; we built a hierarchical control system, robust actuator mounts, and an effective safety system. The result is a capable 6-wheeled offroad vehicle that can be electronically controlled by remote or directly by wire. A feed-forward control law was incorporated for speed control, yielding predictable performance given a desired speed. …
Legacy Borehole Project, Maza Brady, Luke Cashman, Erin Hicks, Meghan Richey
Legacy Borehole Project, Maza Brady, Luke Cashman, Erin Hicks, Meghan Richey
Interdisciplinary Design Senior Theses
The Legacy Borehole Project is a three-year effort to design and build a sensor package that will be used to explore the geological and chemical conditions of the ocean floor. Over the course of three years, a mechanical structure and a robotic system will be constructed to lower sensors into previously drilled boreholes. As the team responsible for the development of the first year of this project, we have constructed a prototype sensor package and mock mechanical structure to test a communication interface between the sensors and a graphical user interface. The sensors were tested by lowering the sensor package …
Shrouded Small Wind Turbines, Kristen Flannery, Michael Holligan, Joseph Soares
Shrouded Small Wind Turbines, Kristen Flannery, Michael Holligan, Joseph Soares
Mechanical Engineering Senior Theses
The goal of this project is to improve the energy production of small wind turbines (rated less than 100 kW) by increasing wind velocity at the turbine blades through the design of a shroud attachment. The design process involves the analysis of various computer aided design (CAD) nozzle/diffuser shroud geometries. Computational fluid dynamic (CFD) modeling is used to analyze the effect of shroud features on velocity and pressure fields. A 3D printed scale model is tested in a wind tunnel with strain gauges and pressure transducers to validate the CFD data. The resulting design locally increases velocity by a factor …
Proteus: Mini Underwater Remotely Operated Vehicle, Jorge Guerra, Robert Heinevetter, Tristan Morris, Killian Poore, Alexandra Waschura
Proteus: Mini Underwater Remotely Operated Vehicle, Jorge Guerra, Robert Heinevetter, Tristan Morris, Killian Poore, Alexandra Waschura
Mechanical Engineering Senior Theses
Marine ecosystems contain life, minerals, information, etc, that can help the planet, however, only 5% of them are explored. This is mainly because existing Underwater Remotely Operated Vehicles (ROVs) are expensive and require a lot of workand time to use. Team Proteus designed a low cost, easy to use, portable, safe, and reliable ROV capable of being used for scientific research, while being operated and maintained by students. In this paper we explain the necessity behind this project, how it compares to similar projects and the design decisions made in developing the ROV, to include the options and trade-offs considered. …
Lightweight Uav Launcher, Ben Miller, Christian Valoria, Corinne Warnock, Jake Coutlee
Lightweight Uav Launcher, Ben Miller, Christian Valoria, Corinne Warnock, Jake Coutlee
Mechanical Engineering
This report discusses the design, construction, and testing of a lightweight, portable UAV launcher. There is a current need for a small team of soldiers to launch a US Marine Tier II UAV in a remote location without transport. Research was conducted into existing UAV launcher designs and the pros and cons of each were recorded. This research served as a basis for concept generation during the initial design development stage. It was required that the design weigh less than 110 lbs, occupy a smaller volume than 48" x 24" 18" in its collapsed state, be portable by a single …