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2016

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Full-Text Articles in Engineering

The Development Of A Prosthetic Training Software For Upper Limb Amputees, Tyler Kayne Sullins Jun 2016

The Development Of A Prosthetic Training Software For Upper Limb Amputees, Tyler Kayne Sullins

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to develop an intuitive software that aids in the field of prosthetic training and rehabilitation by creating an individualized visualization of joint angles. This software is titled “the prosthetic training software (PTS) for individualized joint angle representation”, and it enables the individualized portrayal of predicted or pre-recorded joint angles. The PTS is an intuitive program for clinicians and prosthesis users that produces an animation of a virtual avatar reflecting the user’s segment lengths and amputation for rehabilitation and training purposes.

The PTS consists of a graphical user interface (GUI) and a 3D visualization of …


Dynamic Simulation And Analysis Of Fsae Racer For Development Of Stability Control System, Stone D. Williford Jun 2016

Dynamic Simulation And Analysis Of Fsae Racer For Development Of Stability Control System, Stone D. Williford

Honors College Theses

Using Adams/Car software, a computer model of Georgia Southern University’s 2016 Formula Society of Automotive Engineers (FSAE) racecar was developed with the purpose of researching vehicle stability under dynamic conditions. Previous research in this field of study has been conducted to verify that Adams/Car simulations provide accurate results using data acquisition systems, so the major work for the current research has been to create an updated version of the vehicle designed and fabricated by Eagle Motor Sports. With this new model, vehicle roll, and pitch data as well as vehicle traction were collected during dynamic simulations. The overall goal for …


Biophysical Characterization And Theoretical Analysis Of Molecular Mechanisms Underlying Cell Interactions With Poly(N-Isopropylacrylamide) Hydrogels, Michael C. Cross Jun 2016

Biophysical Characterization And Theoretical Analysis Of Molecular Mechanisms Underlying Cell Interactions With Poly(N-Isopropylacrylamide) Hydrogels, Michael C. Cross

USF Tampa Graduate Theses and Dissertations

So-called, “Dynamic biomaterials” comprised of stimuli-responsive hydrogels are useful in a wide variety of biomedical applications including tissue engineering, drug delivery, and biomedical implants. More than 150,000 peer-reviewed articles (as of 2016) have been published on these materials, and more specifically, over 100,000 of these are on the most widely studied, poly(N-isopropylacrylamide). This thermoresponsive polymer in a crosslinked hydrogel network undergoes a large volume phase transition (𝑉/𝑉0 ~ 10 − 100) within a small temperature range (𝑇 ~ 1 − 3𝐾) making it particularly useful for tissue engineering applications because of the ability to control the topographical configuration of …


Jazzing Up Next-Gen Librarians For Freshman Engineering Instruction Delivery, Marian G. Armour-Gemmen, Chanelle Pickens, Robin A.M. Hensel, Mary L. Strife, Mariam Jalalifard Jun 2016

Jazzing Up Next-Gen Librarians For Freshman Engineering Instruction Delivery, Marian G. Armour-Gemmen, Chanelle Pickens, Robin A.M. Hensel, Mary L. Strife, Mariam Jalalifard

Faculty & Staff Scholarship

Because of the need for science and engineering librarians, both nationwide and at West Virginia University (WVU), a model of Introduction to STEM Disciplines’ Information Use and Mentoring

occurred at WVU. The engineering librarians introduced new resident librarians and a graduate research assistant to the Freshman Engineering program and involved them in teaching several engineering information literacy sessions. The goal of engaging the new librarians into the educational activities was to motivate their learning, gain feedback on current teaching strategies and fresh ideas for possible future implementation, and facilitate buy-in of the need for and role of STEM-specific librarians. The …


Small-Scale And Large-Scale Interventions To Improve [State] Student’S College Readiness, Virgil U. Pierce, Javier A. Kypuros, Shirley J. Mills Jun 2016

Small-Scale And Large-Scale Interventions To Improve [State] Student’S College Readiness, Virgil U. Pierce, Javier A. Kypuros, Shirley J. Mills

Mechanical Engineering Faculty Publications and Presentations

We are conducting two interventions aimed at improving entering students’ college readiness and mathematics placement. The small-scale intervention is aimed at working with students on the university campus. Students who are targeted have high school course work indicating that they have experience in Calculus or Pre-Calculus courses, but whose placement tests have not indicated they are ready for Calculus. At our institution this is a significant number of students and the goal of the project is to develop methods to address and accelerate students in this category. The course design, to take advantage of the students’ prior experience, emphasizes practice …


Extending Wid To Train Mechanical Engineering Gtas To Evaluate Student Writing, Nancy Barr Jun 2016

Extending Wid To Train Mechanical Engineering Gtas To Evaluate Student Writing, Nancy Barr

Department of Mechanical and Aerospace Engineering Publications

Beyond first-year composition, the typical undergraduate mechanical engineering curriculum provides few opportunities to develop writing skills without a concerted effort by faculty to incorporate writing into their courses. One underutilized path for BSME students to strengthen those skills is the required sequence of laboratory courses, where students write several lab reports, evaluated by graduate teaching assistants (GTAs), many of whom speak English as a second language. Historically, engineering GTAs have not been trained in evaluating student writing in a way that helps students improve their technical communication skills, a method known as formative assessment. Formative assessment can be a key …


Promoting School Earthquake Safety Through A Classroom Education Grassroots Approach, Lelli Van Den Einde, Heidi Tremayne, Thalia Anagnos, James Mallard Jun 2016

Promoting School Earthquake Safety Through A Classroom Education Grassroots Approach, Lelli Van Den Einde, Heidi Tremayne, Thalia Anagnos, James Mallard

Faculty Publications

The earthquake engineering community has recognized that in seismically active regions throughout the United States, hundreds of thousands of students and staff unknowingly study and work in structurally vulnerable school and university buildings. The School Earthquake Safety Initiative (SESI), spearheaded by the Earthquake Engineering Research Institute (EERI), is a collaborative network of diverse, expert, and impassioned professionals who are committed to creating and sharing knowledge and tools that enable broadminded, informed decision making around school earthquake safety. The Classroom Education and Outreach Subcommittee of SESI is tackling the problem of school safety from a grassroots approach, with the goal of …


Development Of An Instrument To Measure The Entrepreneurial Mindset Of Engineering Students, Cheryl Q. Li, Ronald S. Harichandran, Maria-Isabel Carnasciali, Nadiye O. Erdil, Jean Nocito-Gobel Jun 2016

Development Of An Instrument To Measure The Entrepreneurial Mindset Of Engineering Students, Cheryl Q. Li, Ronald S. Harichandran, Maria-Isabel Carnasciali, Nadiye O. Erdil, Jean Nocito-Gobel

Civil Engineering Faculty Publications

This work in progress describes the development of an instrument to measure entrepreneurial mindset of engineering students. The need for developing the entrepreneurial mindset of engineering students is being recognized by many universities. However, very few comprehensive, generalized and well-validated instruments are available for assessing the entrepreneurial mindset of engineering students. Most research and educational efforts focus on the design and implementation of engineering entrepreneurship programs, but assessment practices have not kept up.1-2 There are several reasons for the shortfall in assessment practices: 1) Introducing engineering students to entrepreneurship is a relatively new trend and it will take time for …


Integrating E-Learning Modules Into Engineering Courses To Develop An Entrepreneurial Mindset In Students, Nadiye O. Erdil, Ronald S. Harichandran, Jean Nocito-Gobel, Maria-Isabel Carnasciali, Cheryl Q. Li Jun 2016

Integrating E-Learning Modules Into Engineering Courses To Develop An Entrepreneurial Mindset In Students, Nadiye O. Erdil, Ronald S. Harichandran, Jean Nocito-Gobel, Maria-Isabel Carnasciali, Cheryl Q. Li

Engineering and Applied Science Education Faculty Publications

Engineering graduates who will be leaders in today’s rapidly changing environment must possess an entrepreneurial mindset and a variety of professional skills in addition to technical knowledge and skills. An entrepreneurial mindset applies to all aspects of life, beginning with curiosity about our changing world, integrating information from various resources to gain insight, and identifying unexpected opportunities to create value. The Kern Entrepreneurial Engineering Network (KEEN) defines curiosity, connections and creating value as three core components of an entrepreneurial mindset. These 3Cs coupled with associated engineering skills forms KEEN’s entrepreneurial mindset framework. An entrepreneurial mindset enables engineers to develop sound …


What Does It Mean To Be An Engineer? A Comparison Of Adult Students At Three Institutions, Tressa Kay Mikel, Pedro Sh Kim, Maria-Isabel Carnasciali, Shannon Ciston Jun 2016

What Does It Mean To Be An Engineer? A Comparison Of Adult Students At Three Institutions, Tressa Kay Mikel, Pedro Sh Kim, Maria-Isabel Carnasciali, Shannon Ciston

Engineering and Applied Science Education Faculty Publications

Our work is motivated by the need to cultivate a diverse group of talented future engineers. Adult undergraduate students over the age of 25 are an important source of engineers, with life experience that can enhance student experience, but not much is understood yet about this specific group. Adult students face challenges specific to their demographic due to responsibilities in other aspects of their life as employees, parents, spouses, and more. This paper examines adult engineering students’ conceptions of what an engineer is, across three distinct academic environments: a community college, a small private undergraduate university, and a large public …


Preliminary Assessment Of And Lessons Learned In Pitch: An Integrated Approach To Developing Technical Communication Skills In Engineers, Nadiye O. Erdil, Ronald S. Harichandran, Michael A. Collura, Jean Nocito-Gobel, David J. Adams, Amanda Simson Jun 2016

Preliminary Assessment Of And Lessons Learned In Pitch: An Integrated Approach To Developing Technical Communication Skills In Engineers, Nadiye O. Erdil, Ronald S. Harichandran, Michael A. Collura, Jean Nocito-Gobel, David J. Adams, Amanda Simson

Mechanical and Industrial Engineering Faculty Publications

The Project to Integrate Technical Communication Habits (PITCH) has been implemented across seven engineering and computer science undergraduate programs starting in fall 2012. The overarching goal of PITCH is to develop written, oral and visual communication skills and professional habits in engineering students. PITCH activities begin in the very first semester and are reinforced and extended through all four years of each program. After three years of progressively more extensive development and deployment, a preliminary assessment of student writing over their first three years in programs was performed. In May 2016 the first cohort of students will have completed the …


Dango (Doings And Goings On) - Vol. 22 | Issue 6, Hannah Hamilton, Matthew Kimball, Aric Tate, Haley Stien, Vicente Rojas, Caleb Hicks, Zhaojia Xi, Joshua Daniel Martinez, Reuben Byrd, Paul Carstens, Mike Daugherity, Donald Isenhower Jun 2016

Dango (Doings And Goings On) - Vol. 22 | Issue 6, Hannah Hamilton, Matthew Kimball, Aric Tate, Haley Stien, Vicente Rojas, Caleb Hicks, Zhaojia Xi, Joshua Daniel Martinez, Reuben Byrd, Paul Carstens, Mike Daugherity, Donald Isenhower

DANGO: Doings and Goings On: Summer Research Newsletter, Department of Engineering and Physics

Weekly newsletter from ACU Physics and Engineering


Exploring Proficiency Testing Of Programming Skills In Lower-Division Computer Science And Electrical Engineering Courses, Karla Steinbrugge Fant, Branimir Pejcinovic, Phillip Wong Jun 2016

Exploring Proficiency Testing Of Programming Skills In Lower-Division Computer Science And Electrical Engineering Courses, Karla Steinbrugge Fant, Branimir Pejcinovic, Phillip Wong

Electrical and Computer Engineering Faculty Publications and Presentations

It is generally accepted that all engineering students should be able to perform some programming tasks. For example, ABET calls for electrical engineering (EE) curricula to include “engineering topics (including computing science) necessary to analyze and design complex electrical and electronic devices, software, and systems containing hardware and software components.” In most disciplines, programming plays a supporting role as one of the tools that future engineers will need to tackle problem solving and design projects. Because it is considered such a basic tool, programming is typically taught in freshman or sophomore courses. Many engineering students get their first exposure to …


Developing Entrepreneurial Mindset In Industrial Engineering Classes: A Case Study, Farnaz Ghazi Nezami, Massoud Tavakoli, Mohammad Torfeh Jun 2016

Developing Entrepreneurial Mindset In Industrial Engineering Classes: A Case Study, Farnaz Ghazi Nezami, Massoud Tavakoli, Mohammad Torfeh

Industrial & Manufacturing Engineering Presentations And Conference Materials

Instilling entrepreneurial mindset among engineering students is one of the challenges in engineering education. This paper presents the efforts to improve a core undergraduate industrial engineering course, Designing Value in Supply Chain, to infuse entrepreneurial thinking among students using an internally funded grant by Kern Entrepreneurial Engineering Network (KEEN). For this purpose, three new course modules are designed and their effectiveness on student learning is evaluated. This course is ideal for establishing entrepreneurially minded learning (EML) as a systematic approach is required for managing the chain of supply, especially since the impacts of the decisions are not isolated and will …


The 2015 Capstone Design Survey: Observations From The Front Lines, Susannah Howe, Sophia L. Poulos, Laura Mae Rosenbauer Jun 2016

The 2015 Capstone Design Survey: Observations From The Front Lines, Susannah Howe, Sophia L. Poulos, Laura Mae Rosenbauer

Engineering: Faculty Publications

Capstone design courses offer engineering students a culminating design experience on an applied engineering project, but the structure, logistics, and implementation of capstone courses varies widely. The 2015 Capstone Design Survey, conducted in spring 2015, continued the decennial census of capstone design courses to catalog current practices, identify emerging trends, and provide historical comparison. The survey reprised many of the questions from its 1994 and 2005 predecessors, augmented with additional questions based on other capstone-related surveys, design education conference topics, and open-ended responses. The survey was completed by 522 respondents representing 256 institutions across the U.S., including a handful of …


Longitudinal Success Of Calculus I Reform, Doug Bullock, Kathrine E. Johnson, Janet Callahan Jun 2016

Longitudinal Success Of Calculus I Reform, Doug Bullock, Kathrine E. Johnson, Janet Callahan

Mathematics Faculty Publications and Presentations

This paper describes the second year of an ongoing project to transform calculus instruction at Boise State University. Over the past several years, Calculus I has undergone a complete overhaul that has involved a movement from a collection of independent, uncoordinated, personalized, lecture-based sections, into a single coherent multi-section course with an activelearning pedagogical approach. The overhaul also significantly impacted the course content and learning objectives. The project is now in its fifth semester and has reached a steady state where the reformed practices are normative within the subset of instructors who might be called upon to teach Calculus I. …


The Impact Of Volunteering At A Girls Outreach Activity On Community Formation, Donna C. Llewellyn, Janet Callahan, Amy J. Moll, Catherine Rose Bates Jun 2016

The Impact Of Volunteering At A Girls Outreach Activity On Community Formation, Donna C. Llewellyn, Janet Callahan, Amy J. Moll, Catherine Rose Bates

Materials Science and Engineering Faculty Publications and Presentations

This paper is focused on exploring the motivation for volunteering at an engineering outreach activity. The outreach activity itself involved a two day, overnight experience for 9th and 10th grade girls that started in 2005, and which has been held annually since that time. The outreach event takes place in Boise, Idaho, and at the time of its onset was the only outreach or camp activity in the state focused on girls or young women. Across ten years, 510 total girls have participated, with approximately 85% of them coming from the immediate metropolitan area. The program was developed with a …


Web Publication Utilized As A Communication Tool For First Year Engineering Students, Hyun J. Kwon Jun 2016

Web Publication Utilized As A Communication Tool For First Year Engineering Students, Hyun J. Kwon

Faculty Publications

© American Society for Engineering Education, 2016. This work in progress (WIP) paper describes the effectiveness of web publication as a communication tool for first year engineering students. Although the importance of generating a professionally written report has not diminished, web publication is quickly emerging as a necessary means of communicating for engineering students. In this digital age, an engineering education should have not neglect the importance of electronic communication and web based knowledge management. Web based publications provide several benefits compared to traditional portfolios: they allow students a means of enhancing visual/multimedia illustrations, provide students a means of developing …


All Active All The Time? What Are The Implications Of Teaching A Traditional Content-Rich Machine Components/Mechanical Systems Design Course Using Active Learning?, James M. Widdmann, Peter Schuster Jun 2016

All Active All The Time? What Are The Implications Of Teaching A Traditional Content-Rich Machine Components/Mechanical Systems Design Course Using Active Learning?, James M. Widdmann, Peter Schuster

Mechanical Engineering

This paper examines the use of research-proven Active Learning techniques to transform the teaching of a traditional Machine Components/Mechanical Systems Design class. We know from research in Active learning that use of these methods can often lead to greater conceptual understanding and greater engagement of the students with engineering course materials, yet a common concern among engineering faculty is that the adoption of Active learning techniques will not allow the full breadth and depth of traditional content coverage. In this work, the authors reimagined one of the most content-heavy courses in a traditional Mechanical Engineering curriculum by including many Active …


Why This Flip Wasn't A Flop: What The Numbers Don't Tell You About Flipped Classes, Heather Noel Fedesco, Troy Cary Jun 2016

Why This Flip Wasn't A Flop: What The Numbers Don't Tell You About Flipped Classes, Heather Noel Fedesco, Troy Cary

IMPACT Publications

This paper details the conversion of a large, required Civil Engineering fluid mechanics course into a more student-centered, active learning-oriented course through the flipping of one lecture per week. In the flipped class, students collaboratively solve homework problems in groups while receiving “expert” feedback from instructors and TAs. To offset the lost lectures, some course material that has been delivered in traditional lectures has been placed online in the form of short videos and textbook readings, with low-stakes quizzes for assessment.

Student learning gains were quantitatively assessed by comparing quiz and final exam scores for three semesters (1 pre-flip and …


Development And Use Of The Energy Model Of A Research And Demonstration House With Advanced Design Features, Nelson Fumo, Vicente Bortone Jun 2016

Development And Use Of The Energy Model Of A Research And Demonstration House With Advanced Design Features, Nelson Fumo, Vicente Bortone

Mechanical Engineering Faculty Publications and Presentations

Advances on manufacturing processes and the use of new materials are increasing the efficiency and reducing the cost of energy efficient and renewable energy technologies to a point that their deployment will reach desired levels for the sake of energy security and environmental concerns. Along these advances, the demonstration of the cost-effectiveness of this technology is vital to educate people and promote deployment of these technologies. In this sense, at the University of Texas at Tyler, two research and demonstration houses were built. House #1 is a conventional design with some advanced features, and House #2 has more advanced design …


Dr. Wade Goodridge Elected As Cur National Engineering Councilor | Engineering Education, Usu College Of Engineering Jun 2016

Dr. Wade Goodridge Elected As Cur National Engineering Councilor | Engineering Education, Usu College Of Engineering

College of Engineering News

Dr. Wade Goodridge has just been elected as a national engineering councilor for the Council of Undergraduate Research (CUR). CUR is the administering organization for the National Conferences on Undergraduate Research (NCUR). NCUR is a national conference showcasing undergraduate student research. Dr. Goodridge has a team of 6 undergraduate researchers currently working on various areas of his research and has mentored 2 students to develop and present research over the previous years at NCUR, UCUR, and Posters on the Hill. Dr. Goodridge will serve in this elected position for 3 years.


Farewell To A Mentor | College Of Engineering, Usu College Of Engineering Jun 2016

Farewell To A Mentor | College Of Engineering, Usu College Of Engineering

College of Engineering News

June 24, 2016 – After 22 years of service to Utah State University, College of Engineering Dean Dr. Christine Hailey will step down to begin a new leadership role in Texas and to be closer to family.


Thermal Conductivity Of Binary Sand Mixtures Evaluated Through Full Water Content Range, Benjamin M. Wallen, Kathleen M. Smits, Toshihiro Sakaki, Stacy E. Howington, T.K.K. Chamindu Deepagoda Jun 2016

Thermal Conductivity Of Binary Sand Mixtures Evaluated Through Full Water Content Range, Benjamin M. Wallen, Kathleen M. Smits, Toshihiro Sakaki, Stacy E. Howington, T.K.K. Chamindu Deepagoda

Civil Engineering Faculty Publications - Archive

A soil’s grain-size distribution affects its physical and hydraulic properties; however, little is known about its effect on soil thermal properties. To better understand how grain-size distribution affects soil thermal properties, specifically the effective thermal conductivity, a set of laboratory experiments was performed using binary mixtures of two uniform sands tightly packed with seven different mixing fractions over the full range of saturation. For each binary mixture, the effective thermal conductivity, l, capillary pressure, hc, and volumetric water content, q, were measured. Results demonstrated that the l–q relationship exhibited distinct characteristics based on the percentage of fine- and coarse-grained sands. …


Effects Of Electrode Off Centre On Trapped Thickness-Shear Modes In Contoured At-Cut Quartz Resonators, Junjie Shi, Cuiying Fan, Minghao Zhao, Jiashi S. Yang Jun 2016

Effects Of Electrode Off Centre On Trapped Thickness-Shear Modes In Contoured At-Cut Quartz Resonators, Junjie Shi, Cuiying Fan, Minghao Zhao, Jiashi S. Yang

Department of Mechanical and Materials Engineering: Faculty Publications

We investigated thickness-shear vibrations of a contoured, AT-cut quartz resonator with a pair of electrodes displaced from the resonator centre. The scalar differential equations by Stevens and Tiersten for thickness-shear vibrations of electroded and unelectroded quartz plates were employed. Based on the variational formulation of the scalar differential equations established in a previous paper and the variation-based Ritz method with trigonometric functions as basis functions, free vibration resonance frequencies and trapped thickness-shear modes were obtained. The effects of the electrode off centre on resonance frequencies and mode shapes were examined. When the electrode off centre is about one hundredth of …


Wet Air Oxidation For Industrial Wastewater And Sludge Treatment: First Results Of A New Research Program In Quebec, Jean-François Vermette, Sophie Girard, Patrick Desjardins Jun 2016

Wet Air Oxidation For Industrial Wastewater And Sludge Treatment: First Results Of A New Research Program In Quebec, Jean-François Vermette, Sophie Girard, Patrick Desjardins

5th International Congress on Green Process Engineering (GPE 2016)

Introduction

Sub-critical water technologies, in particular wet air oxidation (WAO), have been developing across Europe in recent decades. This process is now used at the industrial scale for the effective treatment of wet organic material, mainly sludge from wastewater treatment plants (WWTP), and is done with energy self-sufficiency [1, 2]. In WAO, hot pressurised water (200-350 ˚C, 30-200 bars) is enriched with oxygen or air to initiate exothermic oxidation of organic material, mostly into CO2 and H2O. Since the operating temperature is much lower than typical incineration, no gaseous emissions of NOX, dioxins or furans …


How To Reduce The Energy Costs Of Food And Dairy Products To Spray Drying?, Pierre Schuck, Anne Dolivet, Serge Méjean, Romain Jeantet Jun 2016

How To Reduce The Energy Costs Of Food And Dairy Products To Spray Drying?, Pierre Schuck, Anne Dolivet, Serge Méjean, Romain Jeantet

5th International Congress on Green Process Engineering (GPE 2016)

The most frequently used technique for dehydration of dairy products is spray drying. This is an effective method to preserve biological products as it does not involve prolong exposure of materials to severe heat treatment. Due to the variety and complexity of the concentrates to be dried, a more rigorous understanding of spray-drying based on physico-chemical and thermodynamic properties is necessary. At the same time, the current state of the art did not allow easy determination of the parameters of spray-drying of dairy products prior to drying, except from performing several complex and expensive experiments with pilot-scale spray-dryer. Nevertheless, recent …


Oxygen/Steam Charcoal Gasification In A Fluidized Alumina Bed, Rui Moreira, Rui Vaz, António Portugal, Noemí Gil-Lalaguna, Fernando Bimbela, José Luis Sánchez Jun 2016

Oxygen/Steam Charcoal Gasification In A Fluidized Alumina Bed, Rui Moreira, Rui Vaz, António Portugal, Noemí Gil-Lalaguna, Fernando Bimbela, José Luis Sánchez

5th International Congress on Green Process Engineering (GPE 2016)

Mixtures of oxygen and steam were used as gasifying agents to produce a gas stream with high hydrogen content. The effects of the equivalence ratio (ER) and steam to carbon ratio (S/C) on gasification performance were studied at 900 ºC. The highest hydrogen yield (0.412 Nm3/kg charcoal) and apparent energy efficiency (33.43%) were achieved using a mixture that had a S/C ratio of 0.625 and an ER equal to 0.3 (pure oxygen). The results showed that the carbon conversion improved when the ER and the S/C ratio were augmented, and that the production of tars increased when the …


Modeling The Influence Of Various Water Stressors On Regional Water Supply Infrastructures And Their Embodied Energy, Weiwei Mo, Qiong Zhang Jun 2016

Modeling The Influence Of Various Water Stressors On Regional Water Supply Infrastructures And Their Embodied Energy, Weiwei Mo, Qiong Zhang

Civil and Environmental Engineering Faculty Publications

Water supply consumes a substantial amount of energy directly and indirectly. This study aims to provide an enhanced understanding of the influence of water stressors on the embodied energy of water supply (EEWS). To achieve this goal, the EEWS in 75 North Carolina counties was estimated through an economic input-output based hybrid life cycle assessment. Ten water stressor indicators related to population, economic development, climate, water source, and land use were obtained for the 75 counties. A multivariate analysis was performed to understand the correlations between water stressor indicators and the EEWS. A regression analysis was then conducted to identify …


Benefits Of Considering More Than Temperature Acceleration For Gan Hemt Life Testing, Ronald A. Coutu Jr., Robert A. Lake, Bradley D. Christiansen, Eric R. Heller, Christopher A. Bozada, Brian S. Poling, Glen D. Via, James P. Theimer, Stephen E. Tetlak, Ramakrishna Vetury, Jeffrey B. Shealy Jun 2016

Benefits Of Considering More Than Temperature Acceleration For Gan Hemt Life Testing, Ronald A. Coutu Jr., Robert A. Lake, Bradley D. Christiansen, Eric R. Heller, Christopher A. Bozada, Brian S. Poling, Glen D. Via, James P. Theimer, Stephen E. Tetlak, Ramakrishna Vetury, Jeffrey B. Shealy

Faculty Publications

The purpose of this work was to investigate the validity of Arrhenius accelerated-life testing when applied to gallium nitride (GaN) high electron mobility transistors (HEMT) lifetime assessments, where the standard assumption is that only critical stressor is temperature, which is derived from operating power, device channel-case, thermal resistance, and baseplate temperature. We found that power or temperature alone could not explain difference in observed degradation, and that accelerated life tests employed by industry can benefit by considering the impact of accelerating factors besides temperature. Specifically, we found that the voltage used to reach a desired power dissipation is important, and …