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2013

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Articles 421 - 450 of 1209

Full-Text Articles in Mechanical Engineering

Project Based Learning In Engineering Economics: Teaching Advanced Topics Using A Stock Price Prediction Model, Lizabeth Schlemer Jun 2013

Project Based Learning In Engineering Economics: Teaching Advanced Topics Using A Stock Price Prediction Model, Lizabeth Schlemer

Industrial and Manufacturing Engineering

A graduate level advanced engineering economics class taught at California Polytechnic State University, San Luis Obispo, includes a thorough review of time value of money, investment evaluation, inflation, risk and return, financing decisions, corporate investment strategies, risk analysis and decisions incorporating non-monetary considerations. Historically this course was taught using an advanced text where the topics were covered sequentially. A redesign of the course now includes the construction of a stock price prediction model for a company of the student’s choice. Through the model, the topics are covered and discussed in the context of the large model-building project. For instance, inflation …

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Quantitative Assessment Of Program Outcomes Using Longitudinal Data From The Fe Exam, Joe C. Guarino, James R. Ferguson, V. Krishna C. Pakala Jun 2013

Quantitative Assessment Of Program Outcomes Using Longitudinal Data From The Fe Exam, Joe C. Guarino, James R. Ferguson, V. Krishna C. Pakala

Mechanical and Biomedical Engineering Faculty Publications and Presentations

There have been many studies providing details on using results from the Fundamentals of Engineering (FE) exam as metrics for meeting ABET program outcomes1. However, implementing an FE-based set of metrics poses challenges not limited to assessing validity of results. Programs using FE-based metrics must also determine the position of the metrics in the overall assessment process. We present a method for using FE-based metrics as an integral part of the ABET program assessment process. The principle issues we address are: (1) The validity of using FE metrics for a group of graduating students when not all of …

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Measuring The Impact Of Internships On Design Using A Materials Activity, Craig Johnson, Charles O. Pringle, Nathan Davis Jun 2013

Measuring The Impact Of Internships On Design Using A Materials Activity, Craig Johnson, Charles O. Pringle, Nathan Davis

Engineering Technologies, Safety, and Construction Faculty Scholarship

Our research question focused on how previous student experience, like a job internship, affects an ability to demonstrate engineering design skills. Principal student experience focused on prior industrial experience (e.g. internships), but also included annual project participation (e.g. ASME Design Challenge Teams). The scope of this effort included the creation and application of a design activity, resulting in documents that were evaluated with a metric. The activity focused on the effect of material selection and analysis with regard to ‘design performance’. Creating these activities, and using them to assess design skills is the novel aspect of this effort. Two classes …

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Incorporating Active Learning Into A Thermal System Publications Lecture, Jennifer M. Peuker, Steffen Peuker Jun 2013

Incorporating Active Learning Into A Thermal System Publications Lecture, Jennifer M. Peuker, Steffen Peuker

Mechanical Engineering

Many mechanical engineering departments offer a thermal system design (or similar) course for senior students. Some courses have a laboratory component, but many are a lecture only format. This paper demonstrates how active learning—through virtual labs, a semester long project, and in-class assignments—was incorporated into the lecture portion of a thermal system design course to enhance learning and provide the students a laboratory experience without a physical laboratory. These active learning ideas can also supplement the learning during lecture for those courses which have a designated laboratory time. Anecdotal evidence of the activities indicates that students were engaged and enjoyed …

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Effect Of Multiple Choice Testing On Student Performance In An Introductory Engineering Course, Jennifer M. Peuker, Jennifer Mcferran Brock, Steffen Peuker Jun 2013

Effect Of Multiple Choice Testing On Student Performance In An Introductory Engineering Course, Jennifer M. Peuker, Jennifer Mcferran Brock, Steffen Peuker

Mechanical Engineering

This study aims to compare student performance on introductory engineering statics material by comparing the exam scores of students who are given both multiple choice (MC) questions and constructed response (CR) questions to see whether the type of exam question makes a difference in student performance and understanding. Seventy-five students in an introductory engineering course did either a MC version or a CR version of each statics problem, resulting in MC answers and a control group of CR answers to each statics problem. The students were also polled for feedback regarding their preferences of test question format at the end …

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Student Industry Cooperation For The Development Of Thermal System Design Teaching Laboratory Equipment, Steffen Peuker Jun 2013

Student Industry Cooperation For The Development Of Thermal System Design Teaching Laboratory Equipment, Steffen Peuker

Mechanical Engineering

In higher education, hands-on undergraduate education using state-of-the-art laboratory equipment is important to meet the quality standards expected in the engineering profession. However, the development of modern engineering laboratories is not only time consuming, but also budget constraints can hamper the development of needed laboratories for instructional purposes as Bidana and Billo state: "Development of state-of-the-art engineering laboratories is becoming an increasing problem in the University environment. Due to the greater variety and increased complexity of much state-of-the-art hardware and software, the cost and cycle time for development and startup of a modern engineering laboratory can be excessive. This, together …

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Reliability-Based Design Optimization Of Concrete Flexural Members Reinforced With Ductile Frp Bars, Bashar Behnam, Christopher D. Eamon Jun 2013

Reliability-Based Design Optimization Of Concrete Flexural Members Reinforced With Ductile Frp Bars, Bashar Behnam, Christopher D. Eamon

Civil and Environmental Engineering Faculty Research Publications

In recent years, ductile hybrid FRP (DHFRP) bars have been developed for use as tensile reinforcement. However, initial material costs regain high, and it is difficult to simultaneously meet strength, stiffness, ductility, and reliability demands. In this study, a reliability-based design optimization (RBDO) is conducted to determine minimum cost DHFRP bar configurations while enforcing essential constraints. Applications for bridge decks and building beams are considered, with 2, 3, and 4-material bars. It was found that optimal bar configuration has little variation for the different applications, and that overall optimized bar cost decreased as the number of bar materials increased.

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Quikchill : Thermoelectric Water Cooler, Franz Louie Chua, Brandon Ohara, Rachel Reid, Bernadette Tong Jun 2013

Quikchill : Thermoelectric Water Cooler, Franz Louie Chua, Brandon Ohara, Rachel Reid, Bernadette Tong

Mechanical Engineering Senior Theses

Motivated by the increasing residential energy utilization projections and the fact that water and ice dispensers consume 20% of total refrigerator energy, a thermoelectric water chiller was designed to provide a more energy efficient alternative. Implementing the chiller under the sink provides a convenient means to source cold, filtered water, thereby eliminating the need for water and nice dispensers as well as filtering pitchers. The cooling chamber design integrates thermoelectric modules (TEMs), which operate on the Peltier effect to cool filtered water down to 14 [degrees] C. The implementation of TEMs reduced current dispenser energy consumption by 82.4%, from 91 …

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Design, Fabrication, And Analysis Of A 3u Cubesat Platform, Todd Chun-Van Osdol, Charles Dorsey, Jake Hedlund, Thomas Hoye, Owen Jacobs, Kadja Klarreich-Giglio, Elliott Martin, Michael Ruiz, Michael Schlesselmann, Zachary Singh Jun 2013

Design, Fabrication, And Analysis Of A 3u Cubesat Platform, Todd Chun-Van Osdol, Charles Dorsey, Jake Hedlund, Thomas Hoye, Owen Jacobs, Kadja Klarreich-Giglio, Elliott Martin, Michael Ruiz, Michael Schlesselmann, Zachary Singh

Mechanical Engineering Senior Theses

The goal of this project is to develop a 3U CubeSat nanosatellite bus capable of short duration technology verification experiments while providing compelling handson student education opportunities. This 3U CubeSat platform has been prototyped by the design team in order to demonstrate its capabilities. This spacecraft, the Unspecified Payload Active Attitude Control Nanosatellite (UPAACN), is designed to perform a 3-6 month technology verification experiment for a NASA test component and an SCU single-axis attitude control system (AACS) in Low Earth Orbit (LEO). This project builds upon the flight heritage of SCU's Robotic Systems Laboratory (RSL) and improves its satellite development …

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The Experimental Study On Local Scour Around A Circular Pipe Undergoing Vortex-Induced Vibration In Steady Flow, Bing Yang, Tao Yang, Jian-Lin Ma, Jin-Sheng Cui Jun 2013

The Experimental Study On Local Scour Around A Circular Pipe Undergoing Vortex-Induced Vibration In Steady Flow, Bing Yang, Tao Yang, Jian-Lin Ma, Jin-Sheng Cui

Journal of Marine Science and Technology–Taiwan

The local scour around a circular pipe undergoing vortexinduced vibration is investigated experimentally in a water flume. The typical characteristic of local scour is analyzed in detail. The influences of initial gap-to-diameter ratio (e0/D), the mode of pipe vibration and the sand type on the local scour are discussed. Experimental results indicate that there exists strong intensity of scour when the pipe moves close to the surface of the sandy bed. The vibration of the pipe results in the rapid development of sandy bed’s scouring. With the increase of gap-to-diameter ratio the distance between the center of the pipe and …

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A Piston-Type Porous Wave Energy Converter Theory, Ching-Yun Yueh, Shih-Hsuan Chuang Jun 2013

A Piston-Type Porous Wave Energy Converter Theory, Ching-Yun Yueh, Shih-Hsuan Chuang

Journal of Marine Science and Technology–Taiwan

This study investigates the performance of a piston-type porous wave energy converter (PTPWEC), which consists of a solid wall, a vertical porous plate, a transmission bar, a rigid block constrained by rollers, a spring, and a damper. The PTPWEC is subjected to dynamic external loading by wave actions. To simulate this dynamic system, a mathematical model is used with a single-degree-of-freedom (SDOF) system. Linear wave theory governs the entire fluid domain, which is divided into two regions by the vertical porous plate. Darcy's law is applied to flow through the porous plate. Finally, this investigation employs an eigenfunction expansion to …

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Application Of A Support Vector Machine For Liquefaction Assessment, Ching-Yinn Lee, Shuh-Gi Chern Jun 2013

Application Of A Support Vector Machine For Liquefaction Assessment, Ching-Yinn Lee, Shuh-Gi Chern

Journal of Marine Science and Technology–Taiwan

This study presents a support vector machine (SVM)-based approach for predicting earthquake liquefaction. The SVM model database includes five indexes: earthquake magnitude, total overburden pressure, effective overburden pressure, qc values from cone penetration tests (CPT), and peak ground acceleration. The proposed model was trained and tested on a dataset comprising 466 field liquefaction performance records and CPT measurements. A grid search method with k-fold cross-validation was also used to verify the feasibility. Compared with an artificial neural network (ANN)–based method, the SVM-based method has the advantage of increased accuracy and simpler operation. Experimental results show that the proposed SVM approach …

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An Alternative System Identification Method For Friction Stir Processing, Dustin John Marshall Jun 2013

An Alternative System Identification Method For Friction Stir Processing, Dustin John Marshall

Theses and Dissertations

Temperature control has been implemented in friction stir processing and has demonstrated the ability to give improved process control. In order to have optimal control of the process, the parameters of the system to be controlled must be accurately identified. The system parameters change with tool geometry and materials, workpiece materials, and temperature. This thesis presents the use of the relay feedback test to determine the system parameters. The relay feedback test is easy to use and promotes system stability during its use. The results from the relay feedback test can be used to determine controller gains for a PID …

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Formula Electric : Powertrain, Mark Allison, Bryan Bidwell, Stuart Hopson, Jackson Smith, Carlos Streegan, Dominic Villa Jun 2013

Formula Electric : Powertrain, Mark Allison, Bryan Bidwell, Stuart Hopson, Jackson Smith, Carlos Streegan, Dominic Villa

Interdisciplinary Design Senior Theses

The Santa Clara Formula Electric team designed, and manufactured a powertrain for an electric racecar according to the rules prescribed by the SAE International Formula Electric competition. The powertrain is divided into subsystems: the battery pack, battery pack cooling system, motor controller, and the motor. The battery pack was constructed, but full electrical connection of all cells were not made. The pack was not integrated with the motor and motor controller. In addition, due to time constraints, extensive testing could not be completed.

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Project Omoverhi : Low-Cost, Neonatal Incubator, Richard Fong, Guillermo Gallardo, William Jeffery, Danny Maeda, Gabriel Romero Jun 2013

Project Omoverhi : Low-Cost, Neonatal Incubator, Richard Fong, Guillermo Gallardo, William Jeffery, Danny Maeda, Gabriel Romero

Interdisciplinary Design Senior Theses

Project Omoverhi, since its beginning in 2010-2011, has been focused on creating an incubator that has the capability of operating completely off grid. This year the project has been focused on redesigning the original system to reduce the cost to approximately $1000. In addition to this we have designed and implemented a control system that enables the user to set a desired temperature which can be maintained to within 1 degree Celsius. Before the project is able to be completed further work must be done. The thermal storage system that was initially proposed by the original team still needs to …

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Thermoelectric Cookstove, Christine Horman, Matthew Lee, Mark Wagner Jun 2013

Thermoelectric Cookstove, Christine Horman, Matthew Lee, Mark Wagner

Mechanical Engineering Senior Theses

A fuel efficient cookstove tailored to the needs of Nicaraguan small business owners that incorporated insulation and thermoelectric power generation was built and validated. There is a 4 inch layer of pumice rock insulation around the combustion chamber, which significantly reduces convective heat losses to the environment. The stove's ventilation system is powered by the electricity generated by thermoelectric generators. Preheated air is forced into the combustion chamber, which increases the combustion efficiency, reducing the fuel consumption and the harmful smoke produced. Through various testing methods, we found that the controlled airflow to the charcoal fuel allows the stove to …

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The Squad : Santa Clara Quadrotor Autonomous Drone, Jacob Adams, Peter Baumgartner, Mark Johnson, Michael Mccormick Jun 2013

The Squad : Santa Clara Quadrotor Autonomous Drone, Jacob Adams, Peter Baumgartner, Mark Johnson, Michael Mccormick

Mechanical Engineering Senior Theses

We have constructed a quadrotor unmanned aerial vehicle (UAV) that could be used to supplement emergency response personnel, including police and military, when in the field. The SQUAD focused primarily on designing and constructing a sound structure for the UAV, as well as beginning controls work, which will be continued by another team at a later date. This quadrotor UAV has a video camera to provide a live video from its point of view to the user. It carries a global positioning system (GPS) to provide information on its location, and to navigate to waypoints in the immediate area. The …

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Cerberus : A Human Powered Vehicle, Colin Austin, Miles Graugnard, Max Herrmannsfeldt, Dane Kornasiewicz, Leif Kjos, Terra Oldham, Toban Platt, Theodore Schapp, Sean Smith Jun 2013

Cerberus : A Human Powered Vehicle, Colin Austin, Miles Graugnard, Max Herrmannsfeldt, Dane Kornasiewicz, Leif Kjos, Terra Oldham, Toban Platt, Theodore Schapp, Sean Smith

Mechanical Engineering Senior Theses

A recumbent trike was designed and built for the ASME Human Powered Vehicle Challenge held at San Jose State University in April of 2013. The vehicle was designed to be low cost for use by commuters and as primary transportation in developing countries. The vehicle placed 11th overall in the competition out of 29 teams, and scored 8th in the innovation event, which was its best ranking out of the 5 individual events.

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First Spectroscopic Identification Of Pyrocarbonate For High Co2 Flux Membranes Containing Highly Interconnected Three Dimensional Ionic Channels, Lingling Zhang, Xinyu Huang, Changyong Qin, Kyle Brinkman, Yunhui Gong, Siwei Wang, Kevin Huang Jun 2013

First Spectroscopic Identification Of Pyrocarbonate For High Co2 Flux Membranes Containing Highly Interconnected Three Dimensional Ionic Channels, Lingling Zhang, Xinyu Huang, Changyong Qin, Kyle Brinkman, Yunhui Gong, Siwei Wang, Kevin Huang

Faculty Publications

Identification of the existence of pyrocarbonate ion C2O52− in molten carbonates exposed to a CO2 atmosphere provides key support for a newly established bi-ionic transport model that explains the mechanisms of high CO2 permeation flux observed in mixed oxide-ion andcarbonate-ion conducting (MOCC) membranes containing highly interconnected three dimensional ionic channels. Here we report the first Raman spectroscopic evidence of C2O52− as an active species involved in the CO2-transport process of MOCC membranes exposed to a CO2atmosphere. The two new broad peaks centered at 1317 cm−1 …

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Phase Change Material In Automated Window Shades, Quinlan Adler, Jake Gallau, Alexander Zatopa, Ali Nash Jun 2013

Phase Change Material In Automated Window Shades, Quinlan Adler, Jake Gallau, Alexander Zatopa, Ali Nash

Mechanical Engineering Senior Theses

The purpose of this report is to detail the development process for a phase change material window shading system, which stores solar thermal energy and later releases it indoors to provide nighttime space heating. To do this, wax-filled louvers with thermally absorptive front faces were developed and outfitted with a control system, which utilized historical weather data to orient the louvers to specific solar azimuthal angles, thus maximizing the thermal absorption. The system was tested against other common window treatments in a pair of thermally comparable testing structures, and was found to provide energy savings as high as 50%.

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Conical Indentation Of A Viscoelastic Sphere, J. K. Phadikar, T. A. Bogetti, V. N. Kaliakin, Anette M. Karlsson Jun 2013

Conical Indentation Of A Viscoelastic Sphere, J. K. Phadikar, T. A. Bogetti, V. N. Kaliakin, Anette M. Karlsson

Mechanical Engineering Faculty Publications

Instrumented indentation is commonly used for determining mechanical properties of a range of materials, including viscoelastic materials. However, most—if not all—studies are limited to a flat substrate being indented by various shaped indenters (e.g., conical or spherical). This work investigates the possibility of extending instrumented indentation to nonflat viscoelastic substrates. In particular, conical indentation of a sphere is investigated where a semi-analytical approach based on “the method of functional equations” has been developed to obtain the force–displacement relationship. To verify the accuracy of the proposed methodology selected numerical experiments have been performed and good agreement was obtained. Since it takes …

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Rating Low Levels Of Ambient Noise In Performing Arts Facilities, Lily M. Wang, Brent A. Kraay Jun 2013

Rating Low Levels Of Ambient Noise In Performing Arts Facilities, Lily M. Wang, Brent A. Kraay

Durham School of Architectural Engineering and Construction: Faculty Publications

Previous studies have indicated that common indoor noise rating metrics, such as Noise Criteria NC and Room Criteria RC, do not best correlate to human perceptions of annoyance and distraction in typical office environments. Based on investigations conducted at the University of Nebraska using noise levels between 30 – 60 dBA, the author has proposed that an effective indoor noise rating method should begin with a rating of level (either dBA or sones), then an assessment of spectral quality, tones, and fluctuations. How well would such a system work at very low levels of ambient noise, though, as found in …

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Quantifying The Just Noticeable Difference Of Reverberation Time With Band-Limited Noise Centered Around 1000 Hz Using A Transformed Up-Down Adaptive Method, Matthew G. Blevins, Adam T. Buck, Zhao Peng, Lily M. Wang Jun 2013

Quantifying The Just Noticeable Difference Of Reverberation Time With Band-Limited Noise Centered Around 1000 Hz Using A Transformed Up-Down Adaptive Method, Matthew G. Blevins, Adam T. Buck, Zhao Peng, Lily M. Wang

Durham School of Architectural Engineering and Construction: Faculty Publications

This study seeks to quantify the just noticeable difference (JND) of reverberation time (RT) using band-limited noise. ISO 3382-1 lists the JND of reverberation metrics at 5% based on work by Seraphim (1958). However, others have found the JND of RT to be higher from 6% to 39%. Many of these studies utilized band-limited stimuli, e.g. speech, music motifs and bandlimited noise. A previous study by the authors conducted on 30 subjects using white noise demonstrated a JND of RT at 22%. To further verify these results and investigate potential upward frequency masking, the present study was conducted following the …

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Icarus : Aerial Recording System, Jim Cochran, Nick Xydes, Jimmy Erskine, Audrey Kocmond Jun 2013

Icarus : Aerial Recording System, Jim Cochran, Nick Xydes, Jimmy Erskine, Audrey Kocmond

Mechanical Engineering Senior Theses

The goal of Project ICARUS is to create an aerial videography system that is easy to set up, inexpensive, portable, and highly adaptable to any situation. This is accomplished by using a balloon mounted camera rig that is grounded by a number of winches. This system is able to obtain a higher altitude than similar systems and is much more cost effective because the system can be applied to a number of circumstances such as sporting events, disaster relief, wildlife videography, and aerial monitoring, to name a few. The ICARUS system allows the user to control the position of an …

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Effects Of Background Noise Alternating Between Two Levels At Varying Time Intervals On Human Perception And Performance, Andrew Hathaway, Lily M. Wang Jun 2013

Effects Of Background Noise Alternating Between Two Levels At Varying Time Intervals On Human Perception And Performance, Andrew Hathaway, Lily M. Wang

Durham School of Architectural Engineering and Construction: Faculty Publications

This research experiment aims to better quantify human perception and performance under increased background noise levels of varying intervals. Twenty-seven participants were tested over five 30 minute sessions where they were subjected to RC-29(H) and RC-47(RV) conditions created by broadband noise fluctuating on different time intervals. These intervals varied from two minutes to ten minutes, simulating the conditions of a noisy HVAC system turning on and off. The performance results of an arithmetic test dealing with short-term memory and a subjective questionnaire will be presented and compared to a similar test using broadband noise bursts and correlated to noise metrics …

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Effects Of Reverberation And Noise On Speech Comprehension By Native And Non-Native English-Speaking Listeners, Zhao Peng, Lily M. Wang, Siu Kit Lau, Adam M. Steinbach Jun 2013

Effects Of Reverberation And Noise On Speech Comprehension By Native And Non-Native English-Speaking Listeners, Zhao Peng, Lily M. Wang, Siu Kit Lau, Adam M. Steinbach

Durham School of Architectural Engineering and Construction: Faculty Publications

Previous studies have demonstrated the negative impact of adverse signal-to-noise-ratios on non-native English-speaking listeners' performance on speech recognition using recall tasks, as well as implied that comprehension skills were more impaired than recognition skills under reverberation and noise. The authors have themselves previously conducted a pilot study on three native and three non-native Englishspeaking listeners to examine the effects of reverberation and noise using speech comprehension tasks. Those results suggested that speech comprehension performance is worse under longer reverberation times (RT), and that a longer RT is more detrimental to speech comprehension by non-native listeners than native listeners. This paper …

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Ramjet Combustion Chamber, Paul Cameron Stone Jun 2013

Ramjet Combustion Chamber, Paul Cameron Stone

Aerospace Engineering

A ramjet combustion chamber is designed and some initial assembly fabrication and test completed as a component of a ramjet graduate project for California Polytechnic State University, San Luis Obispo Supersonic Wind Tunnel. The combustor design is driven by a theoretical model created by a Cal Poly graduate student, Harrison Sykes. Temperature, pressure, and fuel flow will be measured.

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Exploring A High-Tech Approach To Subterranean Dwelling Environments For Commercial Implementation, Matthew Richard Gordon Jun 2013

Exploring A High-Tech Approach To Subterranean Dwelling Environments For Commercial Implementation, Matthew Richard Gordon

Industrial and Manufacturing Engineering

People are always looking to experience something interesting and unique when on vacation. What could be more unique than staying in a hotel that is completely underground? While people have always been amazed at natural caves and other subterranean structures, the idea of spending the night in one of these is a somewhat untried area, although it could be quite the selling point. This being the case, the idea of a subterranean hotel is not so farfetched, however there are a number of issues that arise with this project. These issues include construction and selecting the proper site and building …

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Cal Poly Chocolates, Jason Ferrel, Taylor Fitzpatrick Jun 2013

Cal Poly Chocolates, Jason Ferrel, Taylor Fitzpatrick

Industrial and Manufacturing Engineering

Our design for this project began with building a strong understanding of the current production process. A meeting with the manager, Anna Nakayama, provided a detailed overview of the entire process and outlined some areas of concern. In addition, she provided us with access to critical data such as standard operating procedures and inventory spreadsheets. From there, time studies were conducted for each of the 8 types of chocolate. These time studies helped identify three main issues facing Cal Poly Chocolates. The first issue is in the packaging area of production. The process is entirely manual and has become a …

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Qualification Of A New Glass Bottle With E&J Gallo Winery, Danielle Leanne Medeiros Jun 2013

Qualification Of A New Glass Bottle With E&J Gallo Winery, Danielle Leanne Medeiros

Industrial and Manufacturing Engineering

This paper will further examine the procedures involved in transitioning to a new bottle type made by Glass Company B, on a specific bottling line within E&J Gallo’s bottling facility. For this project Bottling Line X will require thorough testing as well as the creation of a changeover choreography plan. The testing procedure will follow a 3 phase process utilizing project management and statistical skills to ensure quality standards are upheld with the transition. Since Bottling Line X is not familiar with transitioning between bottle types, lean manufacturing techniques will be required to create a changeover document ensuring operators are …

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