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Surface texture in material removal with MRF on optical ceramics and hard metals

Surface texture in material removal with MRF on optical cera...

引用

Optical Fabrication and Testing, OFT 2008

作者： Shafrir, S.N. Miao, C. Romanofsky, H. Lambropoulos, J.C. Jacobs, S.D. Laboratory for Laser Energetics United States Department of Mechanical Engineering Materials Science Program United States The Institute of Optics University of Rochester Rochester NY United States

We use orthogonal 1D power spectral density (PSD) to study surface texture in MRF spots for optical ceramics and tungsten carbide hard metals. Results reveal how particles in the MR fluid remove material. © 2008 ... 详细信息

ISBN: (纸本)9781557528612

关键词： Tungsten carbide

来源：评论

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Improving campus climate for faculty from underrepresented groups

Improving campus climate for faculty from underrepresented g...

引用

2008 ASEE Annual Conference and Exposition

作者： McClain, Lisa Schrader, Cheryl Callahan, Janet Boise State University Gender Studies Program Boise State University Department of History College of Engineering Department of Electrical and Computer Engineering Boise State University Academic Affairs Boise State University Materials Science and Engieering Department

A continuing challenge in engineering in higher education is that of professional equity regarding opportunity for advancement and job satisfaction due to differences in gender, race, ethnicity, sexual orientation, ability and other factors. Because there are more women and persons of color visible within engineering faculties and administrations than ever before, casual observers might conclude that significant progress has been made in creating an equitable climate in academia. A preponderance of recent studies, however, demonstrate that while women and individuals from other underrepresented groups have gained access to some faculty and administrative positions, this has not necessarily translated into consistent patterns of success through all levels of academic hierarchies and leadership positions. For example, some universities do a good job of recruiting and hiring women faculty and faculty of color, yet beyond this, both groups are consistently underrepresented at certain levels of faculty administration, such as department chair, dean, and endowed chairs. 1-7 In 2005, Boise State University, a mid-sized, metropolitan university, administered a Campus Climate Survey to gain an understanding of how these national trends presented themselves on a particular campus, with the long-term goal of transforming campus climate and culture to enhance opportunities for underrepresented groups. In general, between two-thirds and three-quarters of the faculty who responded to the survey reported that they have been treated fairly and equitably while at the university. The following analysis sheds light on the approximately one-quarter to one-third of faculty members who did not feel that they had been equitably treated while also focusing on responses from the science and engineering faculty in particular. Additionally, this paper explores ways in which engineering and science departments and universities can use climate data to inform strategic plans of action. © America

关键词： Surveys

来源：评论

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The Earth Sustainability course series

The Earth Sustainability course series

引用

2008 ASEE Annual Conference and Exposition

作者： Martin, Cortney Bekken, Barbara McGinnis, Sean Virginia Polytechnic Institute and State University Department of Blacksburg Electronic Village Broadband Wireless Networking Virginia Tech. Virginia Tech. Green Engineering Program Faculty of Materials Science and Engineering and Biological Systems Engineering

A four semester Earth Sustainability-therned general education curriculum was developed by Virginia Tech in response to urgent calls for a more seamless integration of liberal and technical education. It provides a basic framework for understanding worldviews, water, energy, food, shelter, waste, and health from interdisciplinary viewpoints. Incorporating a learning community pedagogy promotes deep and meaningful learning by inviting participants to become active participants in their own learning. The focused curriculum of many engineering programs is not in and of itself adequate preparation for meeting the needs of employers or our planet's growing population and limited resources. But by coupling technical education with an Earth Sustainability-type general education program, and with themes carried throughout the curriculum, we can better prepare engineers to address the complex and ever-changing global problems of the twenty-first century. Engineers have great influence over the utilization of resources, so we are obligated to equip them with the cross-cultural and interdisciplinary knowledge needed to make environmentallyresponsible choices. Preliminary results and findings of the Earth Sustainability program to date are very encouraging with respect to gains in epistemological development and critical thinking. The program will expand next year to include 25-30 engineers among the cohort of 150 students allowing for more detailed impact assessment. © American Society for engineering Education, 2008.

关键词： Curricula

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Microelectronic engineering and nanotechnology education for undergraduates and pre-college students through curriculum reform and outreach activities

Microelectronic engineering and nanotechnology education for...

引用

2008 ASEE Annual Conference and Exposition

作者： Kurinec, Santosh Jackson, Michael Schulte, Thomas Kane, Nathaniel Lewis, Elaine Gupta, Surendra Rochester Institute of Technology Department Head of Microelectronic Engineering Rochester Institute of Technology Department of Microelectronic Engineering Rochester Institute of Technology West Irondequoit High School Rochester NY United States Department of Microelectronic Engineering Rochester Institute Technology BS program in Microelectronic Engineering Department of Microelectronic Engineering RIT Department of Mechanical Engineering Materials Science and Engineering

The extension of microelectronics to new frontiers that include MEMS, nanotechnology, flexible electronics, biotechnology, energy and solid state lighting is inevitable. Development of a necessary multi faceted work force is critical to our nation's innovation edge in these fields. The department of Microelectronic engineering at Rochester Institute of Technology received an NSF implementation grant in 2005 to institute a major department level reform (DLR) to address this critical need. The key elements of this effort consist of curriculum reform in the main program, creation of a novel minor program and diverse activities to reach out to K-12 and precollege community. The curriculum reform consisting of creation of free electives through course consolidations and new course development that included a new nanocharacterization laboratory based course has been instituted. A K-12 teachers' forum on microelectronics and nanotechnology has been developed and delivered. A program package that includes instructional materials, available for wider dissemination, has been developed. A unique 'service learning' co-op experience has been piloted where an engineering student spent two academic quarters in a high school under the guidance of the physics teacher to develop physics laboratories and mentor students in math and science. Feedback from students outlined the benefit of having another knowledgeable individual in the classroom to gain insight about careers in engineering which hopefully will translate into students choosing engineering as a career. These initiatives have significantly enhanced the educational programs at RIT. © American Society for engineering Education, 2008.

关键词： Microelectronics

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Frictional investigation for magnetorheological finishing (MRF) of optical ceramics and hard metals

Frictional investigation for magnetorheological finishing (M...

引用

Optical Fabrication and Testing, OFT 2008

作者： Miao, C. Shafrir, S.N. Romanofsky, H. Mici, J. Lambropoulos, J.C. Jacobs, S.D. Laboratory for Laser Energetics United States Department of Mechanical Engineering Materials Science Program United States The Institute of Optics University of Rochester Rochester NY 14623 United States

Drag force and normal force are measured in real time for spots taken on optical glasses and hard ceramics using the magnetorheological finishing (MRF) process. Removal rates increase nonlinearly with shear stress for... 详细信息

ISBN: (纸本)9781557528612

关键词： Drag

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Nonmetallic inclusions in solar cell silicon: Focusing on recycling of scraps

Nonmetallic inclusions in solar cell silicon: Focusing on re...

引用

2008 Global Symposium on Recycling, Waste Treatment and Clean Technology, REWAS 2008

作者： Zhang, Lifeng Øvrelid, Eivind Senanu, Samuel Agyei-Tuffour, Benjamin Femi, Adegboyega Nathaniel Department of Materials Sci. and Engr. Missouri University of Science and Technology 223 McNutt Hall Rolla MO 65401 United States SINTEF Tronheim Norway Department of Materials Science and Engineering Norwegian University of Science and Technology Norway Department of Environmental Program University of Northern Iowa Cedar Falls IA 50614 United States

ISBN: (纸本)9780873397261

The solar grade silicon ingot produced from directional solidification process usually pushes the impurities to the top and finally cut off and discarded, which leads to material loss. The hard inclusions lead to wire breakages during the cutting of the ingot in wafers. The main kinds of inclusions found in solar grade silicon have been investigated using vacuum filtration: needle-like Si3N4 and lumpy SiC inclusions. Clusters of SiC inclusions and Si3N4 are also found. Surface observations of the scraps before polishing reveals that Si 3N4 inclusions are usually bigger and in some cases can be about a few millimeters. SiC inclusions are usually smaller, ∼200m but can be ∼500m in some cases. Inclusions observed after filtration are mainly SiC with diameters ∼10m. Through the vacuum filtration, 99% inclusions can be removed 99%. The possible mechanisms of filtration are cake filtration for the larger sized Si3N4 and SiC inclusions and deep-bed filtration the SiC inclusions. For the directional solidified silicon ingot, an approximate distance of ∼10mm gave an encouraging cutoff thickness. The inclusions sizes were below 10m.

关键词： Silicon carbide

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TmMicrostructure evolution in nano/sub-micron grained AJSI 301 stainless steel

TmMicrostructure evolution in nano/sub-micron grained AJSI 3...

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TMS 2008 Annual Meeting Supplemental: materials Processing and Properties

作者： Rajasekhara, S. Ferreira, P.J. Karjalainen, L.P. Kyröläinen, A. Materials Science and Engineering Program University of Texas at Austin Austin TX 78712 United States Department of Mechanical Engineering University of Oulu Oulu - 90014 Finland Outokumpu Stainless Oy Tornio - 95400 Finland

ISBN: (纸本)9780873397186

X-Ray diffraction (XRD) and transmission electron microscopy (TEM) have been used to analyze phase and microstructure evolution in a commercial metastable austenitic stainless steel - AISI 301, which have been cold-rolled to 52% reduction and subsequently annealed at 600C, 800C, and 1000C, for periods of short annealing times (1, 10 and 100 seconds). These studies reveal that the 52% cold-rolled AISI 301 stainless steel primarily consists of martensite microstructure. Annealing these cold-rolled samples at 600C for short durations (1 and 10 seconds) results in negligible martensite to austenite reversion. However, the X-Ray diffraction data from samples annealed at higher temperature of 800C suggests austenite reversion and M23C6 carbide precipitation in these samples, which is confirmed by TEM images. Carbide precipitation is also observed in the images of samples annealed 1000C Since carbide precipitation typically occurs in carbon containing stainless steel alloys that are annealed for long durations (>0.1 hours/360 seconds) we report for the first time, carbide precipitation in a short annealed (1, 10 and 100 seconds) commercial austentitic stainless steel.

关键词： Austenite

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Prediction of coating structure change during calendering

Prediction of coating structure change during calendering

引用

TAPPI Advanced Coating Fundamentals Symposium

作者： Ma, Deqiang Carter, R. Douglas Bousfield, Douglas W. Huber Engineered Materials Macon GA 31217 United States Paper Surface Science Program Department of Chemical and Biological Engineering University of Maine Orono ME 04469 United States

ISBN: (纸本)1595101748

The final coating structure is important in terms of coating gloss and opacity, print gloss, and ink setting characteristics. Much empirical experience has moved coatings towards optimum levels, but when there is a raw material change or grade change, there is much expense in predicting the final coating structure. Many recent computer models have advanced our abilities to predict coating structure from particle packing models, but little has been done to describe the calendering operation that is known to determine coating gloss. Here, a particle level model to describe the compression of pigments to simulate the calendering operation is proposed. Particles are placed into a structure with a drainage flow field and compressed with a row of particles that represent the calender surface. The results are compared to pilot scale experiments for two pigment size distributions. The gloss increase due to calendering and the pore size distributions are well predicted before and after calendering. The modeling technique should help predict the gloss response of coating suspensions with various pigment size distributions.

关键词： Coatings

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In situ drag force measurements in MRF of optical glasses

In situ drag force measurements in MRF of optical glasses

引用

Optical Fabrication and Testing, OFT 2008

作者： Adar, S. Romanofsky, H. Shafrir, S.N. Miao, C. Lambropoulos, J.C. Jacobs, S.D. ORT Braude College of Engineering Karmiel Israel Laboratory for Laser Energetics United States Department of Mechanical Engineering Materials Science Program United States Institute of Optics University of Rochester Rochester NY 14623 United States

A spotting technique using the magnetorheological finishing (MRF) process s applied to measurements of drag force for optical glasses. In situ measurement results are reported as a function of substrate surface roughn... 详细信息

ISBN: (纸本)9781557528612

关键词： Surface roughness

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Nanofilm coatings for transport control and biocompatibility

Nanofilm coatings for transport control and biocompatibility

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IEEE SENSORS

作者： Jaebum Park Mike McShane Materials Science and Engineering Program Texas A and M University College Station TX USA Department of Biomedical Engineering Materials Science and Engineering Program Texas A and M University College Station TX USA

Ultrathin nanofilm coatings are proposed as novel dual-purpose materials for sensor applications. Flux-based biosensors, such as those employing enzymes, require incorporation of a diffusion-limiting coating to balance the incoming substrates with reaction kinetics to obtain a measurable signal. Furthermore, if the sensors will be used in vivo, the outer surface must be biocompatible, which requires resistance to adsorption of proteins. An attractive solution for controlling diffusion and blocking nonspecific adsorption is the layer-by-layer (LbL) self-assembly method, which allows for the construction of nanocomposite ultrathin films comprising multiple layers of polymers with alternating charge. This paper describes the construction and characterization of nanofilms with different compositions to assess their biocompatibility and permeability to model analytes such as glucose and urea.

关键词： Coatings Biosensors Surface resistance Polymer films Biological materials Biochemistry Kinetic theory Electrical resistance measurement In vivo Immune system

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