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2008 ASEE Annual Conference and Exposition

作者： Burack, Cathy Duffy, John Melchior, Alan Morgan, Eric Brandeis University University of Massachusetts Lowell United States Department of Mechanical Engineering SLICE Program Graduate Program Solar Energy Engineering Center for Youth and Communities Heller School for Social Policy and Management Solar Energy Engineering

SLICE is a multi-year initiative at the University of Massachusetts Lowell (UML) that is designed to embed service-learning opportunities for students throughout the undergraduate curriculum in the College of engineering, with the ultimate goal that each student would have at least one course every semester with a service-learning project. Since it began in 2004, thirty-seven full-time faculty members in the engineering college at UML have tried service-learning (S-L) in at least one of their courses over the last three years, out of an average of 70 faculty members who taught undergraduate courses. In 2003 there was one full-time faculty member engaged in S-L. As a result of SLICE, a total of 52 courses (35 of them required core undergraduate courses) taken by engineering students have had S-L integrated into them, with a total of over 700 student-courses each semester. This group of faculty members is perhaps the largest associated with a single engineering college using S-L. They were recruited in part by the principle of "start small rather than not at all." The program has a combination of grass-roots initiative and administration support. As part an ongoing evaluation, in depth interviews with fourteen faculty members who had tried SLICE were undertaken by experienced assessors of S-L projects from an outside university. All of the faculty members interviewed indicated that they saw SLICE as a valuable element in the engineering program, based on their own experience. All saw it as adding important dimensions to the learning experience that were not available through traditional classroom exercises, and all believed that it was consistent with efforts to broaden students' understanding of both engineering and their role in society. Finally, though all noted challenges with regard to implementation, they also indicated that the integration of S-L was worth the extra effort that it often involved. One faculty member even said, "It will change the way we think ab

关键词： Students

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Attracting underrepresented groups to engineering with service-learning

Attracting underrepresented groups to engineering with servi...

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114th Annual ASEE Conference and Exposition, 2007

作者： Barrington, Linda Duffy, John University of Massachusetts Lowell United States Francis College of Engineering University of Massachusetts Lowell United States Department of Mechanical and Solar Engineering Graduate Program in Solar Engineering Village Empowerment Project

The University of Massachusetts Lowell College of engineering has an objective to integrate service-learning into core required courses in every department so every student every semester has at least one course with S-L (SLICE: Service-Learning Integrated throughout a College of engineering). Why? Because past research has shown service-learning (S-L) to be effective meeting course learning objectives while addressing real community needs and to be successful for students on a number of cognitive and affective measures. In addition, the college wishes to attract and retain underrepresented groups in engineering. For example, the college in 2004-05 had only 12% females in its undergraduate engineering population of 914 full-time students compared to 17.5% national average. Since past research has shown that women students respond to applied knowledge and helping people, and underrepresented minorities to community connections, there are many ways in which service-learning is a good fit. Responding to the SLICE initiative, 25 engineering faculty members actually implemented S-L into at least one of their courses during the 04-05 academic year and 34 faculty in 05-06. In 2005-06 over the two semesters an average of 700 undergraduate students participated in S-L projects in 52 courses, some with required S-L projects and others elective. This wide variety of courses included, for example, a first year introduction to engineering with 300 students, kinematics, soil mechanics, heat transfer, engineering ethics, electronics, plastics design, strength of materials, and a senior EE capstone course on assistive technology with 70 students. Community partners included the Lowell National Historical Park, many local rehabilitation clinics, a local food bank, the City Transportation Office, as well as remote villages in a developing country. There is evidence that females are attracted to service-learning projects in 16 universities that have adopted the EPICS program in which

关键词： engineering education

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Service-learning in core courses throughout a mechanical engineering curriculum

Service-learning in core courses throughout a mechanical eng...

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114th Annual ASEE Conference and Exposition, 2007

作者： Duffy, John Barrington, Linda West, Cheryl McKelliget, John Niemi, Eugene Shina, Sammy Sun, Hongwei Niezrecki, Chris Parkin, Robert Charmchi, Majid Avitabile, Peter University of Massachusetts Lowell United States Department of Mechanical and Solar Engineering Graduate Program in Solar Engineering Center for Sustainable Energy Francis College of Engineering United States Numerous Community-university Projects Department of Mechanical Engineering IEEE ASME Heat Transfer Laboratory University of Massachusetts Lowell United States Modal Analysis and Controls Laboratory University of Massachusetts Lowell United States BS MS Doctorate in Mechanical Engineering Italy SEM

Service-Learning (S-L) has been shown to be effective on a large number of cognitive and affective measures for college students. S-L is a pedagogy in which student learning objectives and real community needs are met in a credit-bearing course. In engineering the integration of S-L into any courses, much less existing core courses in a curriculum does not match the penetration in other disciplines. The Mechanical engineering (ME) Department at the University of Massachusetts Lowell has incorporated S-L projects into core courses so that every student has at least one required core course every semester with a S-L project that is either a required or elective part of the course. During 2005-06 fourteen core ME courses had S-L projects, and a required engineering ethics course also had S-L in addition to four elective courses. Nine of twelve ME faculty members incorporated S-L in those courses (more recently 12 of 13), in addition to 3 faculty outside the department teaching courses for ME students. This initiative is part of a college-wide effort to have all five undergraduate programs have S-L integrated into the core curriculum (ECE, ChE, CE, and Plastics E). Courses and projects included, for examples, introduction to engineering for first year students (common to students in all five programs) who designed and built educational displays for the local national historic park, sophomore design lab with device development for student relatives or friends with disabilities, a dynamics course with safety analysis of many local playgrounds, a convective process course with the design of a water supply system for a village in a developing country, a statics course with a water tower design for another village (with the later two systems actually constructed in the villages the college has "adopted"), a machine elements course with four different S-L miniprojects, a ME laboratory course with the design of a measurement system to test local playground surface hardness, a

关键词： Mechanical engineering

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Strategies for integrating service-learning into the engineering core at the university of Massachusetts Lowell and the Massachusetts institute of technology

Strategies for integrating service-learning into the enginee...

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113th Annual ASEE Conference and Exposition, 2006

作者： Banzaert, Amy Duffy, John Wallace, David Massachusetts Institute of Technology United States MIT's Mechanical Engineering Department University of Massachusetts Lowell United States Mechanical Engineering Department Solar Engineering Graduate Program Center for Sustainable Energy University of Massachusetts Lowell United States Department of Mechanical Engineering MIT United States MIT Computer-aided Design Laboratory

While the pedagogy of Service-Learning (S-L) has been applied beneficially in a variety of disciplines, only recently have engineering departments begun to adopt the practice of integrating academically-relevant community service projects into classes and, in doing so, it is most common to offer service-oriented projects in elective classes. However, the University of Massachusetts Lowell and the Massachusetts Institute of Technology have independently begun to develop S-L programs in engineering fields that work specifically to use the pedagogy in the core curriculum of the discipline. While the two universities and educational programs are distinct, the approach to S-L has been reasonably similar, and faculty and staff from each school have used common tools and methods to assess certain aspects of the integration from student and faculty perspectives. From surveys used at both of the schools (almost 760 pre-surveys and 680 post-surveys administered in the 04-05 academic year), a key finding was that student opinion changed significantly regarding the relationship between engineering and societal problems;students developed the belief that engineers should apply their skills to solve social problems. Additionally, both institutions surveyed the engineering faculty about their attitudes toward S-L and found the majority of faculty showed considerable interest in the concept. Overall, these findings show promise for integrating S-L into core engineering curriculums. © American Society for engineering Education, 2006.

关键词： Learning systems

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Alkyl-thiophene-alkyl linkers to construct double-cable conjugated polymers for single-component organic solar cells

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Chinese Chemical Letters 2024年第1期35卷 542-546页

作者： Wenbin Lai Safakath Karuthedath Chengyi Xiao Lei Meng Frédéric Laquai Weiwei Li Yongfang Li Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China King Abdullah University of Science and Technology(KAUST) KAUST Solar Center(KSC)Physical Sciences and Engineering Division(PSE)Material Science and Engineering Program(MSE)Thuwal 23955-6900Kingdom of Saudi Arabia University of Chinese Academy of Sciences Beijing 100049China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

In this work,semirigid linkers of the alkyl-thiophene-alkyl structure are developed to construct double-cable *** alkyl units,propyl(C3H6),hexyl(C6H12),and dodecyl(C12H24),are applied as semirigid linkers,yielding three double-cable polymers:PBC6-T,PBC12-T,and PBC24-T,***12-T which uses C6H12-thiophene-C6H12 linkers is found to exhibit the best device efficiency of 5.56%,while PBC6-T and PBC24-T with shorter or longer linkers yield device efficiencies of only 2.65%and 1.09%in single-component organic solar cells(SCOSCs).Further studies reveal that PBC12-T exhibits higher crystallinity and improved charge transport,resulting in better *** work provides an approach to construct double-cable conjugated polymers with long alkyl linkers,and it shows the importance of the linker length for the photovoltaic performance of SCOSCs.

关键词： Double-cable conjugated polymer Single-component organic solar cell Crystallinity Semirigid linkers Alkyl-thiophene-alkyl

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Fabrication and Characterization of Spin-coated TiO 2 Films

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Energy Procedia 2014年 60卷 191-198页

作者： A. Hosseini K.Ç. Içli M. Özenbaş Ç. Erçelebi Middle East Technical University Department of Physics Ankara 06800 Turkey The Center for Solar Energy Research and Applications (GÜNAM) METU Ankara 06800 Turkey Middle East Technical University Micro and Nanotechnology Graduate Program Ankara 06800 Turkey Middle East Technical University Department of Metallurgical and Materials Engineering Ankara 06800 Turkey

Porous TiO 2 films were deposited on glass and ITO coated glass substrates by spin coating for spinning rates of 2000, 5000, 2000 followed by successive run of 5000 rpm (2000-5000). The AFM, SEM, XRD and UV-Vis analysis of the films coated on bare glass substrates for individual and 2000-5000 rpm runs showed amorphous and crystalline behaviours respectively, while TiO 2 films deposited on ITO/Glass substrates show crystalline structure. Both substrate nature and thickness of the films influence the formation of the crystallinity of the films. Also AFM images reveal that the roughness values of the films are independent of substrate.

关键词： TiO 2 films optical properties electron microscopy spin coating technique XRD.

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RACER - A DESIGN FOR MAINTAINABILITY

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NAVAL ENGINEERS JOURNAL 1985年第5期97卷 139-146页

作者： DONOVAN, MR MATTSON, WS Michael R. Donovanis a 1974 graduate of the United States Naval Academy where he received his undergraduate degree in naval architecture. In 1975 he received a master of science degree in naval architecture and marine engineering from the Massachusetts Institute of Technology. After completing the Navy's nuclear power training program he served as machinery division officer in USSBainbridge (CGN-25) and chemistry and radiological controls assistant in USSLong Beach (CGN-9). He successfully completed the Navy's surface warfare officer qualification and passed the nuclear engineer's examination administered by Naval Reactors. He was then assigned to the Ship Design and Engineering Directorate (SEA-05) Naval Sea Systems Command as head systems engineer on the DDG-51 ship design project where he received the Navy Commendation Medal for outstanding performance. He is currently with Solar Turbines Incorporated as manager ship integration and integrated logistic support for the Rankine cycle energy recovery (RACER) system. Mr. Donovan has lectured at Virginia Polytechnic Institute teaching marine engineering and has given presentations on ship design at various symposiums and section meetings for both ASNE and SNAME. He has been a member of ASNE and SNAME since 1972 and is registered as a professional engineer in California and Virginia. Wayne S. Mattsonreceived his B.S. degree in mechanical engineering from Western New England College in 1972. Following graduation he attended Naval Officer Candidate School and was subsequently assigned as a project officer to COMOPTEVFOR where he was responsible for technical and operational test plans their execution and final equipment appraisal. Following a tour as engineering officer aboard the USSNespelen (AOG-55) he was assigned as commissioning MPA aboard the USSElliot (DD-967) the fifthSpruanceclass destroyer. For the past six years he has been employed by Solar Turbines Incorporated in program management within the advanced development department. He is currently

There is a great deal of emphasis currently in the Navy on the issues of reliability and maintainability. If a system or component is out of commission, it obviously cannot perform its mission. Thus, systems and components must be reliable, with low failure rates, and maintainable, with short repair times when the system does become inoperable. To be effective, these attributes must be incorporated into new ship systems early in the design stage. The Rankine cycle energy recovery (RACER) system is a heat recovery steam cycle designed to recover energy from the exhaust of an LM2500 gas turbine for augmentation of a ship's propulsion system. The RACER system provides several advantages to a gas turbine powered ship, one of which is improved fuel efficiency for significant annual fuel savings. This saving does not come free, however, since, in general, any additional system installed in the ship will have some maintenance requirements. In keeping with the Navy's current emphasis, a key philosophy in the design of the RACER system has been to minimize this maintenance burden. After a brief description of the RACER system and its design philosophy, the techniques being used during the design phase to minimize the maintenance burden on the fleet are presented. Trade-off studies concerning acquisition versus life-cycle costs, including fuel and maintenance costs, are discussed. Innovations incorporated into this state-of-the-art system are reviewed with an emphasis on design for affordability.

关键词： COGENERATION PLANTS

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Implementation of generalized Harvey-Shack theory in light scattering from rough surfaces

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Physical Review A 2020年第6期102卷 063521-063521页

作者： M. Günöven H. Nasser M. Ünal Ö. Aytekin R. Turan A. Bek Micro and Nanotechnology Program of Graduate School of Natural and Applied Sciences Middle East Technical University 06800 Ankara Turkey Center for Solar Energy Research and Applications Middle East Technical University 06800 Ankara Turkey KalyonPV Research and Development Center Kalyon Güneş Teknolojileri Üretim A.Ş. 06909 Ankara Turkey Department of Physics Middle East Technical University 06800 Ankara Turkey Department of Electrical and Electronics Engineering Kırklareli University 39100 Kırklareli Turkey

We present a discrete implementation of generalized Harvey-Shack scalar scattering theory to calculate angular intensity distributions from height profiles of select randomly textured surfaces proposed for use in solar cells and covering a wide range of surface characteristics. We compare these calculations to high-resolution angular intensity distribution measurements. These comparisons suggest that the pupil function does benefit from an additional correction factor for rough surfaces containing lateral feature sizes on the order of the wavelength, which can be attributed to effective medium effects. Moreover, secondary interactions within the surface topography are shown to be a mechanism that partly redistributes scattered power, affecting angular intensity distribution results. These mechanisms emerge as the two main limitations of the Harvey-Shack scalar scattering theory in the far field, which nonetheless produces remarkable quantitative predictions.

关键词： Interference & diffraction of light Light propagation, transmission & absorption Topological effects in photonic systems Light scattering

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Design-dimensioning model for grid-connected photovoltaic systems

Design-dimensioning model for grid-connected photovoltaic sy...

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IEEE Canada Electric Power Conference, EPEC

作者： Johann Hernandez Nelson L. Diaz Gerardo Gordillo Laboratorio de Investigacion en Fuentes Alternativas de Energia LIFAE of Universidad Distrital F.J.C. and Grupo de Materiales Semiconductores & Energia Solar GNS&ES Universidad Nacional de Colombia Bogota Colombia Department of Electrical and computer Engineering Graduate Program in Engineering Industrial AutomationLIFAE GMS&ES Universidad Nacional de Colombia Bogota Colombia Grupo de Materiales Semiconductores & Energia Soolar GMS&ES Universidad Nacional Bogota Colombia

ISBN: (纸本)9781424445080;9781424445097

The main goal in design of grid connected photo voltaic systems is to maximize the energy generation based on local energy requirements, weather conditions, economic and social impact. These factors ought to be taken into account to perform a model that allow design grid-connected photo voltaic systems. In this paper a design-dimensioning model for a small grid-connected photo voltaic systems is developed. This model is based on energy conditions instead of power conditions. There are shown the two main trends that are typically used in the design process and the calculation of the two main components of the system (generator and inverter). An example of the design for a system located in Bogota-Colombia is studied.

关键词： Photovoltaic systems Power grids Power system modeling Mesh generation Inverters solar power generation Power generation Power system economics Power generation economics DC generators

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FUTURE PROPULSION MACHINERY TECHNOLOGY FOR GAS-TURBINE POWERED FRIGATES, DESTROYERS, AND CRUISERS

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NAVAL ENGINEERS JOURNAL 1984年第2期96卷 34-46页

作者： BASKERVILLE, JE QUANDT, ER DONOVAN, MR USN The Authors Commander James E. Baskerville USNis presently assigned to Naval Sea Systems Command (NA VSEA) as the Ship Design Manager for the DDG 51 the Navy's next generation surface combatant. A graduate of the U.S. Naval Academy Class of 1969 he is a qualified Surface Warfare Officer and designated Engineering Duty Officer (ED). He received his M.S. degree in Mechanical Engineering and his professional degree of Ocean Engineer from the Massachusetts Institute of Technology (MIT) and holds a patent right on an Electronic Control and Response System. His naval assignments include tours in USSRamsey (FFG-2) Aide and Flag Lieutenant to the Commander Naval Electronic Systems Command and Ship Superintendent Surface Type Desk Officer and Assistant Design Superintendent at NA VSHIPYD Pearl Harbor. He was awarded the Meritorious Service Medal for distinguished performance at Pearl Harbor Naval Shipyard. As an author he has contributed articles to the ASNEJournaland given presentations at local sections on ship design the use of innovative technology in ship repair and maintenance and the costs and risks associated with engineering progress. Commander Baskerville is a registered Professional Engineer in the State of Virginia an adjunct professor teaching marine engineering at Virginia Tech. and in addition to ASNE which he joined in 1975 is a member of SNAME Tau Beta Pi Sigma Xi ASME and the American Society of Heating Refrigeration and Air Conditioning Engineers (ASHRAE). Dr. Earl R. Quandt:received his degree of Chemical Engineer from the University of Cincinnati in 1956 and his Ph.D. degree in Chemical Engineering from the University of Pittsburgh in 1961. He worked in the naval reactors program at the Bettis Atomic Power Laboratory from 1956 to 1963. Since that time he has been with David Taylor Naval Ship Research and Development Center Annapolis Maryland where he is Head of the Power Systems Division. He contributed to this paper while on a one year assignment to the U.S. Naval Academy as V

A turning point occurred in naval engineering in 1972 when the U.S. N avy chose to use marine gas turbines for the propulsion of its new SPRUANCE and PERRY Class ships. This paper reviews the more than twenty years of experience with turbine technology and its design integration into combat ships needed to make that decision. It is concluded that the availability of a good second generation aircraft derivative engine with proven reliability and a strong commercial base, i.e., the LM-2500, was as important to the decision as was the predicted improved ship effectiveness and cost benefits. This paper discusses improvements that can be made to the twin engine, single gear, single propeller shaft system. Focusing only on this mechanical transmission concept, it addresses the impact of possible improvements to the engine, gear, and shafting. In particular, the paper discusses current LM-2500 related R&D efforts to: (a) obtain improved part-power fuel rates, (b) integrate with a reversing reduction gear, and (c) add on a waste heat recovery steam cycle. Looking ahead to the year 2000, this paper suggests that a successor to the ubiquitous LM-2500 will appear in the 15 MW power range to provide the next step in the evolution of the twin engine package. This new naval engine will most likely be based on an aircraft core that exists at present, such that it will have demonstrated its reliability and commercial potential through many hours of testing prior to its mid-1990 marine conversion. This new engine is expected to offer improved air flow, an excellent fuel rate (approaching a flat 0.30 LB/HP-HR), and effective maintenance monitoring, all at some expense in size, weight, and cost. The year 2000 engine will burn a liquid hydrocarbon fuel similar to JP-5 because of its aircraft origins. Combined with advances in gear and shafting technology, the full twin engine propulsion system of the year 2000 should be markedly lighter, smaller, and more efficient than today's units.

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