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International Conference on Magnetics (INTERMAG)

作者： Y. Melikhov J. Snyder C. Lo P. Matlage S. Song K. Dennis D. Jiles Center for Nondestructive Evaluation Iowa State University Ames IA USA Materials Science and Engineering Department Iowa State University Ames IA USA Materials and Engineering Physics Program US DoE Ames Laboratory Ames IA USA Wolfson Centre for Magnetics Cardiff University Cardiff UK

The results of the effect of chromium substitution for iron on magnetocrystalline anisotropy and its temperature dependence for a series of sintered bulk Cr-substituted cobalt ferrites (CoCr x Fe 2-x O 4 with 0lesxles0.8) over the temperature range 400 to 10 K is reported. SQUID magnetometer is used to measure major hysteresis loops at various different temperature over the range 10-400 K. It was observed that anisotropy increases with decreasing temperature, with the steepest increase coming at progressively lower temperatures for increasing Cr content.

关键词： Magnetic anisotropy Temperature dependence Cobalt Ferrites Temperature distribution Chromium Iron Anisotropic magnetoresistance Perpendicular magnetic anisotropy SQUID magnetometers

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STM observation of formation process of carbon nanotube from 6H-SiC (000-1)

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MRS Online Proceedings Library 2006年第1期901卷 1-6页

作者： T. Maruyama Y. Kawamura H. Bang N. Fujita T. Shiraiwa K. Tanioku Y. Hozumi S. Naritsuka M. Kusunoki Meijo Univ. 21st CENTURY COE program “Nano Factory” Tempaku-ku Nagoya Japan Department of Materials Science and Engineering Meijo University Tempaku-ku Nagoya Japan Japan Fine Ceramics Center FCT Central Research Department Atsuta-ku Nagoya Japan

Formation process of nanosized cap structures on a thermally treated 6H-SiC(000-1) substrate was investigated using atomic-resolution ultrahigh-vacuum scanning tunneling microscopy (UHV-STM). After formation of clusters of carobon particles 1-2 nanometer in diameter at 1150°C, these nanoparticles merged, forming nanosized cap structures. Hexagonal carbon networks, partly composed of pentagons, were clearly observed on the surface of the cap structures for a sample annealed above 1200°C. A model for the formation of carbon nanocaps on 6H-SiC(000-1) was proposed.

关键词： nanostructure scanning probe microscopy (SPM) x-ray photoelectron spectroscopy (XPS)

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Disorder and cluster formation during ion irradiation of Au nanoparticles in SiO2

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Physical Review B 2006年第1期74卷 014202-014202页

作者： P. Kluth B. Johannessen G. J. Foran D. J. Cookson S. M. Kluth M. C. Ridgway Department of Electronic Materials Engineering Australian National University Canberra ACT 0200 Australia Australian Nuclear Science and Technology Organization Menai Australia Australian Synchrotron Research Program Building 434 9700 South Cass Avenue Argonne Illinois 60439 USA

Au nanoparticles (NPs) have been formed by ion beam synthesis in 600nm thin SiO2. Subsequently the NPs were irradiated with 2.3MeV Sn ions at liquid nitrogen temperature. Samples were analyzed using extended x-ray absorption fine structure (EXAFS) spectroscopy and small angle x-ray scattering (SAXS) as a function of Sn irradiation dose. Transmission electron microscopy shows that the NPs largely retain their spherical shape upon irradiation. However, we observe a reduction in average NP size and a concomitant significant narrowing of the size distribution with increasing irradiation dose as consistent with inverse Ostwald ripening. At lower irradiation doses, significant structural disorder is apparent with an effective bond length expansion as consistent with amorphous material. At higher irradiation doses, EXAFS measurements indicate dissolution of a significant fraction of Au from the NPs into the SiO2 matrix (as monomers) and the formation of small Au clusters (dimers, trimers, etc.). We estimate the volume fraction of such monomers/clusters. Ion irradiation thus yields disordering then dissolution of Au NPs.

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Solvent mediated assembly of nanoparticles confined in mesoporous alumina

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Physical Review B 2006年第12期73卷 125412-125412页

作者： Kyle J. Alvine Diego Pontoni Oleg G. Shpyrko Peter S. Pershan David J. Cookson Kyusoon Shin Thomas P. Russell Markus Brunnbauer Francesco Stellacci Oleg Gang Division of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA Center for Nanoscale Materials Argonne National Laboratory Argonne Illinois 60439 USA Department of Physics Harvard University Cambridge Massachusetts 02138 USA Australian Synchrotron Research Program Building 434 Argonne National Laboratory Argonne Illinois 60439 USA Department of Polymer Science and Engineering University of Massachusetts Amherst Massachusetts 01003 USA Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Center for Functional Nanomaterials Brookhaven National Lab Upton New York 11973 USA

The controlled self-assembly of thiol stabilized gold nanocrystals in a mediating solvent and confined within mesoporous alumina was probed in situ with small angle x-ray scattering. The evolution of the self-assembly process was controlled reversibly via regulated changes in the amount of solvent condensed from an undersaturated vapor. Analysis indicated that the nanoparticles self-assembled into cylindrical monolayers within the porous template. Nanoparticle nearest-neighbor separation within the monolayer increased and the ordering decreased with the controlled addition of solvent. The process was reversible with the removal of solvent. Isotropic clusters of nanoparticles were also observed to form temporarily during desorption of the liquid solvent and disappeared upon complete removal of liquid. Measurements of the absorption and desorption of the solvent showed strong hysteresis upon thermal cycling. In addition, the capillary filling transition for the solvent in the nanoparticle-doped pores was shifted to larger chemical potential, relative to the liquid/vapor coexistence, by a factor of 4 as compared to the expected value for the same system without nanoparticles.

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Mechanical properties of ZrW2O8 filled polymers

Mechanical properties of ZrW2O8 filled polymers

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47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and materials Conference

作者： Kroetch, Chris A. Weyer, Wayne C. Cross, William M. Henderson, Brooks D. Kellar, Jon J. Kjerengtroen, Lidvin Welsh, Jeffry Starkovich, John South Dakota School of Mines and Technology Rapid City SD 57701 United States Air Force Research Laboratory Space Vehicles Directorate Kirtland AFB NM 87117 United States Northrop-Grumman Space Technologies Redondo Beach CA 90278 United States Department of Mechanical Engineering 501 E. St. Joseph St. United States Materials Engineering and Science Program 501 E. St. Joseph St. United States Department of Materials and Metallurgical Engineering 501 E. St. Joseph St. United States Integrated Structural Systems SE Bldg. 472 3550 Aberdeen Ave. United States NGST Structures and Mechanisms Product Center Mail Stop R4-2112 One Space Park

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ISBN: (纸本)1563478080

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Integrated Semiconductor Optical Sensors for Chronic, Minimally-Invasive Imaging of Brain Function

Integrated Semiconductor Optical Sensors for Chronic, Minima...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Thomas T. Lee Ofer Levi Jianhua Cang Megumi Kaneko Michael P. Stryker Stephen J Smith Krishna V. Shenoy James S. Harris Department of Electrical Engineering University of Stanford Stanford CA USA Departments of Electrical Engineering and Applied Physics University of Stanford Stanford CA USA Department of Physiology University of California San Francisco USA Department of Molecular and Cellular Physiology and the Neurosciences Program University of Stanford Stanford CA USA Department of Electrical Engineering and the NeurosciencesProgram University of Stanford Stanford CA USA Departments of Electrical Engineering Applied Physics and Materials Science and Engineering University of Stanford Stanford CA USA

Intrinsic optical signal (IOS) imaging is a widely accepted technique for imaging brain activity. We propose an integrated device consisting of interleaved arrays of gallium arsenide (GaAs) based semiconductor light sources and detectors operating at telecommunications wavelengths in the near-infrared. Such a device will allow for long-term, minimally invasive monitoring of neural activity in freely behaving subjects, and will enable the use of structured illumination patterns to improve system performance. In this work we describe the proposed system and show that near-infrared IOS imaging at wavelengths compatible with semiconductor devices can produce physiologically significant images in mice, even through skull

关键词： Optical sensors Optical imaging Gallium arsenide Brain Optical arrays Sensor arrays Light sources Minimally invasive surgery Monitoring Lighting

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Transforming K-12 education via the collaborative large-scale engineering analysis network for environmental research (CLEANER) project

Transforming K-12 education via the collaborative large-scal...

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113th Annual ASEE Conference and Exposition, 2006

作者： Eschenbach, Elizabeth Johnson, James H. Brus, Chris Carlson, Patricia Giammar, Dan Grauer, Bette Hotaling, Liesl Oguntimein, Gbekeloluwa Safferman, Steven Wentling, Tim Humboldt State University United States Department of Environmental Resources Engineering Humboldt State University United States Howard University United States Department of Environmental Engineering College of Engineering Architecture and Computer Sciences Howard University United States Board of Scientific Counselors Executive Committee U.S. Environmental Protection Agency Office of Research and Development United States EPA's Science Advisory Board Department of Energy-sponsored HBCU/MI Environmental Technology Consortium Board Environmental Studies and Toxicology and the Engineering Council of the American Society for Engineering Education United States University of Iowa United States Program University of Iowa United States Rose-Hulman Institute of Technology United States Department of Rhetoric Rose-Hulman Institute ot Technology U.S. Air Forcer United States Army's Aberdeen Proving Ground NASA's Classroom of the Future Wheeling WV United States Washington University United States Department of Civil Engineering Washington University St. Louis United States Environmental Engineering Science Program Center for Materials Innovation United States McPherson High School United States McPherson High School McPherson KS United States Stevens Institute of Technology United States Stevens Institute of Technology United States Morgan State University United States Michigan State University United States Biosystems and Agricultural Engineering Department Michigan State University United States University of Dayton United States U.S. EPA Office of Research and Development United States National Center for Supercomputing Applications United States Department of Information Science Graduate School of Library and Information Science National Center for Supercomputing Applications University of Illinois United States

The Collaborative Large-scale engineering Analysis Network for Environmental Research (CLEANER) Project Office has been established with funding from the National science Foundation (NSF) to the University of Illinois Urbana-Champaign (UIUC) and a coalition of 11 other institutions. The project office is coordinating the creation of a strategic plan consisting of research, cyberinfrastructure, and education plans that set forth a roadmap for the collaborative engineering analysis network for the study of environmental problems. This report will be completed by July 2007 and requires input from K-12 educators, administrators and other stakeholders in K-12 education. This paper describes the CLEANER project, provides an example of the CLEANER Education Committee's vision for the K-12 area and lists contacts for further information. The intention of this paper is to elicit input from the K-12 engineering education community, including K-12 educators, on how the CLEANER Education Plan could better meet the future needs of K-12 students and educators © American Society for engineering Education, 2006.

关键词： engineering education

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Antibacterial surfaces using plasma-enhanced: Coating/functionalization

Antibacterial surfaces using plasma-enhanced: Coating/functi...

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TANCON 2006 - 15th TANDEC Nonwovens Conference

作者： Jampala, Soujanya N. Manolache, S. Leonas, K. Denes, F.S. Sarmadi, M. Materials Science Program University of Wisconsin-Madison Madison WI 53706 United States Center for Plasma-Aided Manufacturing University of Wisconsin-Madison Madison WI 53706 United States Biological Systems Engineering University of Wisconsin-Madison Madison WI 53706 United States Department of Environment Textiles and Design University of Wisconsin-Madison Madison WI 53706 United States Deaprtment of Textiles Merchandise and Interiors University of Georgia Athens GA 30602 United States

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Synchrotron X-Ray Scattering Studies of the Surface Structure and Dynamics of Liquids and Liquid Films

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MRS Online Proceedings Library 2006年第1期899卷 1-9页

作者： Hyunjung Kim Zhang Jiang Heeju Lee Young Joo Lee Xuesong Jiao Chunhua Li Laurence Lurio Xuesong Hu Jyotsana Lal Miriam Rafailovich S. K. Sinha Department of Physics and Interdisciplinary Program of Integrated Biotechnology Sogang University Seoul Korea Department of Physics University of California San Diego La Jolla USA Department o Physics Northern Illinois University De Kalb USA Department of Materials Science and Engineering SUNY at Stony Brook Stony Brook USA Intense Pulsed Neutron Source Argonne National Laboratory Argonne USA LANSCE Los Alamos National Laboratory Los Alamos USA

The dynamics of surface fluctuations in thin supported polystyrene films have been investigated using x-ray photon correlation spectroscopy (XPCS) in reflection geometry. The results from the films thicker than four times of the radius of gyration (Rg) of polystyrene show the behavior of the capillary waves expected in viscous liquid. However, thinner films show a deviation indicating the need to account for viscoelasticity. Theoretical considerations with viscoelastic liquid model has been performed by introducing frequency dependent viscosity and compared with Fredrickson’s brush model (Macromolecules, 25, 2882 (1992)). The theory has been extended to the surface and interfacial modes in a bilayer film system. The results will be discussed in terms of surface tension, viscosity, and shear modulus.

关键词： polymer film elastic properties

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science fair project for delivery classes in elementary and secondary schools and its significance in Japan

Science fair project for delivery classes in elementary and ...

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113th Annual ASEE Conference and Exposition, 2006

作者： Kanematsu, Hideyuki Barry, Dana Suzuka National College of Technology Japan Department of Materials Science and Engineering Suzuka National College of Technology Japan Institute of Metal Finishing Tokai Chemical Engineering Association Japan Surface Finishing Society of Japan Japan Japan Society of Heat Treatment Japan Central Japan Branch Surface Finishing Society of Japan Japan Central Japan Branch Japan Society of Heat Treatment Japan Clarkson University United States Ansted University's Scientific Board British Virgin Islands United Kingdom Ansted University United States Horizon Program Clarkson University United States

science Fair Projects were recently introduced to Japanese elementary and secondary schools to enhance creativity and the creative thinking skills of Japanese students. The authors of this paper prepared a unique textbook titled science Fair Fun in Japan for this purpose. It was used in DELIVERY CLASSES (those taught by college faculty) by Suzuka National College of Technology in Japan to turn young students onto science and engineering through exciting science fair projects. The book is great for developing creative thinking and problem solving skills, which are needed by the Japanese society in order to remain a world competitor of the 21stcentury. This paper describes delivery classes, and discusses in detail the science fair project and its significance to Japan. © American Society for engineering Education, 2006.

关键词： Project management

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