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Biomedical Topical Meeting, BIO 2006

作者： Hellman, Amy N. Rau, Kaustubh R. Quinto-Su, Pedro A. Venugopalan, Vasan Department of Bioengineering University of California San Diego La Jolla CA 92093 United States National Centre for Biological Sciences Tata Institute of Fundamental Research Bangalore 560 065 India Department of Chemical Engineering and Materials Science University of California Irvine United States Laser Microbeam and Medical Program Beckman Laser Institute Irvine CA 92697 United States

Time resolved imaging and fluorescent assays were used to examine the biological response of confluent cell cultures to pulsed laser microbeam cell lysis using cavitation bubbles generated by Nd:YAG nanosecond laser p... 详细信息

ISBN: (纸本)1557528071

关键词： Pulsed lasers

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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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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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Preface

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Topics in Catalysis 2005年第3期32卷 93-94页

作者： Dr. Devinder. Mahajan Group Leader Dr. Joe D. Allison Chemical and Molecular Engineering Program Materials Science and Engineering Department Stony Brook University New York USA Advanced Fuels Group Energy Sciences & Technology Department Brookhaven National Laboratory Upton New York USA Strategic Research Cono Cophillips Ponca city USA

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Metastable States During Devitrification of a Zr70Pd20Cu10 Metallic Glass

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MRS Online Proceedings Library 2004年第1期805卷 218-228页

作者： Kramer, M. J. Sordelet, D. J. Metal and Ceramic Sciences Program Ames Laboratory (USDOE) Department of Materials Science and Engineering Iowa State University Ames USA

High energy synchrotron x-rays (124.63 keV) are used to investigate the initial stages of the devitrification for the Zr70Pd20Cu10 metallic glass prepared by melt-spinning (MS). Due to the excellent signal:noise, we are able to determine the initial nucleating phase by analyzing the differences in the total scattering function S(Q) as a function of time at a temperature ~ 50 K below the crystallization temperature. The alloy undergoes a structural relaxation prior to nucleation and growth. Devitrification proceeds from nucleation of the icosahedral phase. The differential pair distribution function (dPDF) indicates that the as-quenched alloy may have icosahedral-like order which undergoes local rearrangement to true icosahedral order at an annealing temperature 50 K below the crystallization temperature. More importantly, time-resolved high-energy synchrotron is shown to have excellent sensitivity to the initial atomic rearrangements preceding nucleation in metallic glasses.

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Rapid Synthesis of Crystalline Spinel Tin Nitride by a Solid-State Metathesis Reaction

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Journal of the American ceramic Society 2004年第1期85卷 101-104页

作者： Michael P. Shemkunas George H. Wolf Kurt Leinenweber William T. Petuskey Science and Engineering of Materials Program Department of Chemistry and Biochemistry and Materials Research Science and Engineering Center Arizona State University Tempe Arizona 85287-1604 Member American Ceramic Society.

Spinel tin nitride (Sn 3 N 4 ) was prepared by high-pressure solid-state metathesis reactions. Tin tetraiodide was reacted with lithium nitride and ammonium chloride in a piston–cylinder apparatus at 623 K and 2.5 GPa. Powder X-ray diffraction combined with Rietveld refinement confirmed the spinel structure, with a lattice constant of a = 9.0144(1) Å. Raman spectroscopy revealed five active vibrational modes at 160, 252, 416, 524, and 622 cm −1 , which are consistent with the spinel structure. Mid-infrared spectroscopy exhibited only a Sn–N stretching mode at 547 cm −1 . Transmission electron microscopy was used to reveal particle size and morphology. Electron probe microanalysis was used to verify the elemental composition.

关键词： synthesis spinels tin/tin compounds nitrides

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Biodegradable, multireservoir microdevice for drug delivery

Biodegradable, multireservoir microdevice for drug delivery

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2003 MRS Fall Meeting

作者： Kim, Grace Y. Richards Grayson, Amy C. Cima, Michael J. Langer, Robert Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA Harvard-MIT Division of Health Sciences and Technology Massachusetts Institute of Technology Cambridge MA School of Chemical and Biomolecular Engineering Biomedical Engineering Program Cornell University Ithaca NY Department of Chemical Engineering Massachusetts Institute of Technology Cambridge MA

Drugs have been released from an array of reservoirs in a biodegradable, polymeric microdevice. The reservoirs are formed in a polylactic acid (PLA) substrate and covered with a thin polymer membrane of a faster degrading polymer such as poly(lactic-co-glycolic) acid (PLGA) or a polyanhydride (PA). It is hypothesized that the release characteristics are a result of the drug-membrane interaction, chemical degradation of the membrane, and mechanical rupture of the membrane. This drug delivery platform features an entirely passive mechanism, the ability to simultaneously deliver multiple drugs with different release profiles, and independent drug formulation of the various drug payloads, which is not possible with other drug delivery technologies such as hydrogels or microspheres. The polymer microdevice is now being developed to deliver interleukin-2, followed by the chemotherapeutic carmustine (BCNU) for in vivo experiments. The combination of these two agents has been show to have a synergistic effect in prolonging survival after an intercranial 9L gliosarcoma challenge in a rat model. © 2004 materials Research Society.

关键词： Drug dosage

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Sampling tissue volumes using frequency-domain photon migration

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Physical Review E 2004年第5期69卷 051908-051908页

作者： Frédéric Bevilacqua Joon S. You Carole K. Hayakawa Vasan Venugopalan Laser Microbeam and Medical Program Beckman Laser Institute 1002 Health Sciences Road East Irvine California 92612 USA Department of Biomedical Engineering Univeristy of California–Irvine Irvine Calfornia 92697 USA Department of Chemical Engineering and Materials Science University of California–Irvine Irvine California 92697 USA

We demonstrate the use of Monte Carlo simulations to generate photon scattering density functions (PSDFs) that represent the tissue volume sampled by steady-state and frequency-domain photon migration. We use these results to illustrate how scaling laws can be developed to determine the mean sampling depth of the multiply scattered photons detected by photon migration methods that remain valid outside the bounds of the standard diffusion approximation, i.e., at small source-detector separations and in media where the optical absorption is significant relative to scattering. Using both the PSDF computation and the newly formulated scaling laws, we focus on a comprehensive description of the effects of source modulation frequency, optical absorption, and source-detector separation on the depth of the sampled tissue volume as well as the sensitivity of frequency-domain photon migration measurements to the presence of a localized absorption heterogeneity.

关键词： Tissue

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The Wulff Shape of Alumina: II, Experimental Measurements of Pore Shape Evolution Rates

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Journal of the American ceramic Society 2004年第10期83卷 2572-2583页

作者： Mikito Kitayama Takayuki Narushima Andreas M. Glaeser Department of Materials Science and Engineering University of California Lawrence Berkeley National Laboratory Berkeley California 94720 Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge Massachusetts 02139 Member American Ceramic Society. This research was supported by the Director Office of Energy Research Office of Basic Energy Sciences Materials Sciences Division of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. Now at Functional Materials Engineering Fukuoka Institute of Technology 3-30-1 Wajiro-Higashi Higashi-ku Fukuoka 811-0295 Japan. Now at Department of Metallurgy Tohoku University Aza Aoba Aramaki Aoba-ku Sendai 980-8579 Japan.

The rate at which a facetted tetragonal cavity of nonequilibrium shape approaches a cubic equilibrium (Wulff) shape via surface diffusion was modeled. The shape relaxation rate of a facetted “stretched cylinder” was also modeled. For the first geometry, only an approximate solution based on linearizing the mean potential difference between the source and sink facets was obtained. For the stretched cylinder, both an approximate and an exact solution can be obtained; the approximate solution underestimates the evolution rate by a factor of ∼2. To assess the applicability of the models, nonequilibrium shape pores of identical initial geometry (∼20 μm × 20 μm × 0.5 μm) were introduced into (0001), {10[Onemacr]2}, {1120}, and {100} surfaces of sapphire single crystals using microfabrication techniques, ion-beam etching, and hot pressing. The large (∼20 μm × 20 μm) faces of the pore are low-index surfaces whose nature is dictated by the wafer orientation. A series of anneals was performed at 1900°C, and the approach of the pore shape to an equilibrium shape was monitored. The kinetics of shape evolution are highly sensitive to the crystallographic orientation and stability of the low-index surface that dominates the initial pore shape. The measured variations of the pore aspect ratio were compared to those predicted by the kinetic model. The observations suggest that when the initial bounding surface is unstable, shape relaxation may be controlled by diffusion. However, surface-attachment-limited kinetics (SALK) appears to play a major role in determining the pore shape evolution rate in cases where the initial bounding surfaces have orientations that are part of the Wulff shape.

关键词： alumina pores modeling

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Publisher’s Note: “Polymer-specific effects of bulk relaxation and stringlike correlated motion in the dynamics of a supercooled polymer melt” [J. Chem. Phys. 119, 5290 (2003)]

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The Journal of Chemical Physics 2004年第14期120卷 6798-6798页

作者： M. Aichele Y. Gebremichael F. W. Starr J. Baschnagel S. C. Glotzer Institut Charles Sadron 6 rue Boussingault 67083 Strasbourg France Institut für Physik Johannes Gutenberg-Universität 55099 Mainz Germany Department of Chemical Engineering University of Michigan Ann Arbor Michigan 48109 Chemical Physics Program Institute for Physical Sciences and Technology University of Maryland College Park Maryland 20742 Center for Theoretical and Computational Materials Science and Polymers Division National Institute of Standards and Technology Gaithersburg Maryland 20899 Departments of Chemical Engineering and Materials Science and Engineering University of Michigan Ann Arbor Michigan 48109

M. Aichele, Y. Gebremichael, F. W. Starr, J. Baschnagel, S. C. Glotzer; Publisher’s Note: “Polymer-specific effects of bulk relaxation and stringlike correlated

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