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Conference on Lasers and Electro-Optics

作者： Kang, Christopher Phare, Christopher Weiss, Sharon M. Vlasov, Yurii A. Assefa, Solomon Interdisciplinary Graduate Program in Materials Science Vanderbilt University Nashville TN 37235 United States Department of Physics and Astronomy Vanderbilt University Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University 37235 United States IBM. T.J. Watson Research Center Yorktown Heights NY 10536 United States

Photonic crystal cavities with tunable surface area via multiple-hole defects were investigated for increased resonance wavelength shins upon exposure to variable-index analytes. Sensitivity was improved by 10% compar... 详细信息

ISBN: (纸本)9781557528902

关键词： Surface defects

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Fast response of actuators with self assembly nanoparticle electrodes and ionic liquids

Fast response of actuators with self assembly nanoparticle e...

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Device Research Conference

作者： Sheng Liu Yang Liu Reza Montazami Vaibhav Jain James R. Heflin Qiming Zhang Department of Electrical Engineering University Park PA USA Deparment of Electrical Engineering Penn State University Park PA USA Department of Materials Science and Engineering Virginia Tech Blacksburg VA USA Macromolecular Science and Engineering Virginia Tech Blacksburg VA USA Department of Physics Virginia Tech Blacksburg VA USA Penn State Materials Research Institute University Park PA USA

ISBN: (纸本)9781424465620

In ionomeric polymers, the accumulation or depletion of excess charges (ions) at the electrodes under an applied voltage will generate strain in these regions. This can be made use of for electromechanical transduction devices such as actuators and sensors. The paper investigates a new type of CNC for IPCNC actuators, in which the CNC is fabricated by a self-assembled layer-by-layer (LBL) nanocomposites. The thinness of the CNC electrode layer (~ 0.4 μm) and large strain (~ 7%) of this type of IPCNC actuator result in a high bending actuation speed (~ 0.1 s) with high bending actuation.

关键词： actuators Electrodes Computer numerical control applied voltage Activation DISCHARGE AND EXIT key factors Charge density Proportional Ionic liquids Bending

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Tuning of luminescent sensor response and degradation through manipulation of nanofilm coating properties

Tuning of luminescent sensor response and degradation throug...

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IEEE SENSORS

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

Enzymatic glucose sensors based on luminescent microparticles rely on the reaction of glucose and oxygen with glucose oxidase, where the internal oxygen level is transduced via oxygen-sensitive phosphors. These sensors utilize nanofilm coatings comprising polyelectrolyte multilayers deposited using self-assembly to control transport of glucose, enabling tuning of the range and sensitivity by changing the coating thickness. In this work, it was also found that salt concentrations, which influence thickness and density of nanofilm coatings during multilayer deposition, also influence range, sensitivity, and degradation rate of these sensors.

关键词： Sugar Degradation Films Nanobioscience Sensitivity Biosensors Coatings

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Robust algorithm to generate a diverse class of dense disordered and ordered sphere packings via linear programming

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Physical Review E 2010年第6期82卷 061302-061302页

作者： S. Torquato Y. Jiao Department of Chemistry Department of Physics Princeton Center for Theoretical Science Princeton Institute for the Science and Technology of Materials Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA Department of Mechanical and Aerospace Engineering Princeton University Princeton New Jersey 08544 USA

We have formulated the problem of generating dense packings of nonoverlapping, nontiling nonspherical particles within an adaptive fundamental cell subject to periodic boundary conditions as an optimization problem called the adaptive-shrinking cell (ASC) formulation [S. Torquato and Y. Jiao, Phys. Rev. E 80, 041104 (2009)]. Because the objective function and impenetrability constraints can be exactly linearized for sphere packings with a size distribution in d-dimensional Euclidean space Rd, it is most suitable and natural to solve the corresponding ASC optimization problem using sequential-linear-programming (SLP) techniques. We implement an SLP solution to produce robustly a wide spectrum of jammed sphere packings in Rd for d=2, 3, 4, 5, and 6 with a diversity of disorder and densities up to the respective maximal densities. A novel feature of this deterministic algorithm is that it can produce a broad range of inherent structures (locally maximally dense and mechanically stable packings), besides the usual disordered ones (such as the maximally random jammed state), with very small computational cost compared to that of the best known packing algorithms by tuning the radius of the influence sphere. For example, in three dimensions, we show that it can produce with high probability a variety of strictly jammed packings with a packing density anywhere in the wide range [0.6, 0.7408…], where π/18=0.7408… corresponds to the density of the densest packing. We also apply the algorithm to generate various disordered packings as well as the maximally dense packings for d=2, 4, 5, and 6. Our jammed sphere packings are characterized and compared to the corresponding packings generated by the well-known Lubachevsky-Stillinger (LS) molecular-dynamics packing algorithm. Compared to the LS procedure, our SLP protocol is able to ensure that the final packings are truly jammed, produces disordered jammed packings with anomalously low densities, and is appreciably more robust an

关键词： Packing

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Component-specific electromechanical response in a ferroelectric/dielectric superlattice

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Physical Review B 2010年第17期82卷 174116-174116页

作者： Ji Young Jo Rebecca J. Sichel Eric M. Dufresne Ho Nyung Lee Serge M. Nakhmanson Paul G. Evans Department of Materials Science and Engineering and Materials Science Program University of Wisconsin–Madison Madison Wisconsin 53706 USA Advanced Photon Source Argonne National Laboratory Argonne Illinois 60439 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Materials Science Division Argonne National Laboratory Argonne Illinois 60439 USA

The electronic and electromechanical properties of complex oxide superlattices are closely linked to the evolution of the structure and electrical polarization of the component layers in applied electric fields. Efforts to deduce the responses of the individual components of the superlattice to applied fields have focused on theoretical approaches because of the limitations of available experimental techniques. Time-resolved x-ray microdiffraction provides a precise crystallographic probe of each component using the shift in wave vector and change in intensity of superlattice satellite reflections. We report in detail the methods to measure and analyze the x-ray diffraction patterns in applied electric field and their application to a 2-unit-cell BaTiO3/4-unit-cell CaTiO3 superlattice. We find that the overall piezoelectric distortion is shared between the two components. Theoretical predictions of the electromechanical properties of a superlattice with the same composition constrained to tetragonal symmetry are in excellent agreement with the experiments. Lattice instability analysis, however, suggests that the low-temperature ground state could exhibit antiferrodistortive rotations of TiO6 octahedra within and/or at the interfaces of the CaTiO3 component.

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Flame‐Retardant materials: Intumescent All‐Polymer Multilayer Nanocoating Capable of Extinguishing Flame on Fabric (Adv. Mater. 34/2011)

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Advanced materials 2011年第34期23卷

作者： Yu‐Chin Li Sarah Mannen Alexander B. Morgan SeChin Chang You‐Hao Yang Brian Condon Jaime C. Grunlan Department of Mechanical Engineering Materials Science and Engineering Program Texas A&M University 3123 TAMU College Station TX 77843 USA Multiscale Composites and Polymers Division University of Dayton Research Institute 300 College Park Dayton OH 45469 USA Southern Regional Research Center (SRRC) United States Department of Agriculture (USDA) 1100 Robert E. Lee Blvd. New Orleans LA 70124 USA

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Dilute magnetism and vibrational entropy in Fe2Al5

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Physical Review B 2010年第17期82卷 174419-174419页

作者： Ji Chi Xiang Zheng Sergio Y. Rodriguez Yang Li Weiping Gou V. Goruganti K. D. D. Rathnayaka Joseph H. Ross, Jr. Department of Physics Texas A&M University College Station Texas 77843-4242 USA Materials Science and Engineering Program Texas A&M University College Station Texas 77843-3003 USA Department of Engineering Science and Materials University of Puerto Rico at Mayaguez Mayaguez Puerto Rico 00681-9044 USA

Fe2Al5 contains a Fe-Al matrix through which are threaded disordered one-dimensional chains of overlapping Al sites. We report magnetic, nuclear-magnetic-resonance (NMR), and specific-heat measurements addressing its magnetic and vibrational properties. The Curie-type susceptibility is found to be due to dilute moments, likely due to wrong-site Fe atoms. A27l NMR shift and spin-lattice relaxation measurements confirm these to be indirectly coupled through a Ruderman-Kittel-Kasuya-Yoshida-type interaction. Specific-heat results indicate a large density of low-energy vibrational modes. These excitations generate a linear-T contribution to the specific heat, which however freezes out below about 10 K. These results are attributed to the presence of anharmonic vibrational modes associated with the disordered structural chains.

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In vitro selection of cathepsin E-activity-enhancing peptide aptamers at neutral pH

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International Journal of Peptides 2011年第1期2011卷 834525页

作者： Biyani, Madhu Futakami, Masae Kitamura, Koichiro Kawakubo, Tomoyo Suzuki, Miho Yamamoto, Kenji Nishigaki, Koichi Department of Functional Materials Science Graduate School of Science and Engineering Saitama University Saitama 338-8570 255 Shimo-Okubo Japan City Area Program Saitama Metropolitan Area Saitama Small and Medium Enterprises Development Corporation Chuo-Ku Saitama 338-0001 2-3-2 Kamiochiai Japan Rational Evolutionary Design of Advanced Biomolecules Saitama (REDS) Group Saitama Small Enterprise Promotion Corporation No. 552 Saitama Industrial Technology Center Saitama 333-0844 3-12-18 Kami-Aoki Kawaguchi Japan Janusys Corporation No. 508 Saitama Industrial Technology Center Saitama 333-0844 3-12-18 Kami-Aoki Kawaguchi Japan Proteolysis Research Laboratory Graduate School of Pharmaceutical Sciences Kyushu University Higashi-Ku Fukuoka 812-8582 Japan

The aspartic protease cathepsin E has been shown to induce apoptosis in cancer cells under physiological conditions. Therefore, cathepsin E-activity-enhancing peptides functioning in the physiological pH range are valuable potential cancer therapeutic candidates. Here, we have used a general in vitro selection method (evolutionary rapid panning analysis system (eRAPANSY)), based on inverse substrate-function link (SF-link) selection to successfully identify cathepsin E-activity-enhancing peptide aptamers at neutral pH. A successive enrichment of peptide activators was attained in the course of selection. One such peptide activated cathepsin E up to 260, had a high affinity (KD;300nM), and had physiological activity as demonstrated by its apoptosis-inducing reaction in cancerous cells. This method is expected to be widely applicable for the identification of protease-activity-enhancing peptide aptamers. Copyright © 2011 Madhu Biyani et al.

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9.4: The effect of ballast resistor and field screening on electron emission of nano-diamond emitters fabricated on micropatterned silicon pillar arrays

9.4: The effect of ballast resistor and field screening on e...

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International Conference on Vacuum Nanoelectronics (IVNC)

作者： Nikkon Ghosh Weng Poo Kang Supil Raina Jim Davidson Department of Electrical Engineering Vanderbilt University Nashville TN USA Interdisciplinary Program in Materials Science Vanderbilt University Nashville TN USA

This paper describes the influence of ballast resistor and field screening on the electron field emission behavior of nano-diamond emitter arrays fabricated on micropatterned silicon pillars. Arrays of 50 × 50 silicon pillars with different ballast resistances, pillar separations, capped with nano-diamond, have been fabricated on different silicon substrates as cathode for field emission testing. The goal of this study is to evaluate the fabrication method and electron emission characteristics in this configuration for field emission applications. The electron field emission results have been compared to observe the effect of the ballast resistive behavior and array spacing of micropatterned silicon pillars on the nano-diamond field emission behaviors.

关键词： Silicon Substrates Diamond-like carbon Nanostructures Electronic ballasts Electric fields Fabrication

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Learning outcomes achievement in cooperative education: A survey of engineering students

Learning outcomes achievement in cooperative education: A su...

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2010 ASEE Annual Conference and Exposition

作者： Johrendt, Jennifer Hector, Schantal Northwood, Derek Benzinger, Karen Salinitri, Geri Jaekel, Arunita Watters, Michelle Department of Mechanical and Automotive Engineering University of Windsor Canada International Relations and Economics University of Windsor Canada Department of Engineering Materials University of Windsor Canada Centre for Career Education University of Windsor Canada Mentor Training Program for Teachers and Student Leaders University of Windsor Canada School of Computer Science University of Windsor Canada University of Windsor Canada University of Wisconsin Stout United States

In 2007, the University of Windsor established formal learning outcomes for their cooperative education program and implemented new educational strategies to support the achievement of those outcomes. To gauge the effect of the newly implemented activities on the achievement of the learning outcomes, a survey was developed and administered to students and alumni of the unrevised program (control group) and, more recently in 2009, to students participating in the revised program (experimental group). The survey questions were designed to assess respondents' perceptions of the effect that co-op had on: their academic and career-related goals and motivation;identification of personal strengths, weaknesses and preferences;understanding of academic theory and technical knowledge;development of attributes;and the ability to effectively contribute in the workplace through identified soft and transferable industry-related skills. Students participating in co-op at the University of Windsor may complete regular or extended length work terms. Regular work terms are generally four-months in length, while extended work terms are at least eight months long, although many companies request co-op students for twelve to sixteen month periods. The survey demographics included a question about work term duration, so that the effects of work term length on learning outcomes achievement might also be examined. Although the survey revealed some positive trends related to learning outcomes achievement for control versus experimental groups, they were not at statistically significant levels. However, if the analysis was limited to students who had completed extended work terms, three areas showed changes at statistically significant levels. Decreases in positive response levels were seen for the experimental group with respect to students' abilities to identify personal weaknesses related to their academic options and personal preferences related to workplace options. An increase in posit

关键词： Students

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