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作者： Jiao, Yang Ryckman, Judson D. Liscidini, Marco Sipe, John E. Ciesielski, Peter N. Escobar, Carlos A. Jennings, G. Kane. Weiss, Sharon M. Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Dipartimento di Fisica A. Volta Universit Degli Studi di Pavia via Bassi 6 27100 Pavia Italy Department of Physics Institute for Optical Sciences University of Toronto 60 St. George St. Toronto ON M5S 1A7 Canada Department of Chemical and Biomolecular Engineering Vanderbilt University Nashville TN 37235 United States

We demonstrate large area arrays of patterned nanoporous gold as effective surface enhanced Raman scattering (SERS) templates by using a direct imprinting process. The resulting substrates exhibit a 107 SERS enhanceme... 详细信息

ISBN: (纸本)9781557529107

关键词： Substrates

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Quantum measurement in living cells: Fluorescent diamond nanocrystals for biology

Quantum measurement in living cells: Fluorescent diamond nan...

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2011 International Quantum Electronics Conference, IQEC 2011 and Conference on Lasers and Electro-Optics, CLEO Pacific Rim 2011

作者： McGuinness, L.P. Yan, Y. Stacey, A. Simpson, D.A. Hall, L.T. Maclaurin, D. Prawer, S. Mulvaney, P. Wrachtrup, J. Caruso, F. Scholten, R.E. Hollenberg, L.C.L. School of Physics University of Melbourne VIC 3010 Australia Centre for Quantum Computer Technology School of Physics University of Melbourne VIC 3010 Australia Department of Chemical and Biomolecular Engineering University of Melbourne VIC 3010 Australia School of Chemistry Bio21 Institute University of Melbourne VIC 3010 Australia 3. Physikalisches Institut Universität Stuttgart Pfaffenwaldring D-70550 Stuttgart Germany Centre of Excellence for Coherent X-ray Science School of Physics University of Melbourne VIC 3010 Australia

ISBN: (纸本)9780977565771

We have demonstrated optically detected magnetic resonance of individual fluorescent nanodiamond nitrogen-vacancy centres inside living human HeLa cells, and measured their spin levels and spin coherence times while tracking their location and orientation with nanoscale precision. Quantum coherence was measured through Rabi and spin-echo sequences over long (>10 h) periods, and orientation was tracked with 1° angular precision in 89 ms acquisition time. Individual centres were identified optically by their electron spin resonance spectrum, allowing simultaneous tracking of many otherwise identical flourescent particles. In addition, variation in the decoherence rates was linked to changes in the local environment inside the cells, representing a new non-destructive imaging modality for intracellular biology. © 2011 IEEE.

关键词： Nanodiamonds

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RNA structure characterization from chemical mapping experiments

RNA structure characterization from chemical mapping experim...

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Annual Allerton Conference on Communication, Control, and Computing

作者： Sharon Aviran Julius B. Lucks Lior Pachter Center of Computational Biology and the California Institute for Quantitative Biomedical Research (QB3) University of California Berkeley CA USA School of Chemical and Biomolecular Engineering Cornell University Ithaca NY USA Departments of Mathematics Molecular and Cell Biology and Electrical Engineering and Computer Science University of California Berkeley CA USA

ISBN: (纸本)9781457718175

Despite great interest in solving RNA secondary structures due to their impact on function, it remains an open problem to determine structure from sequence. Among experimental approaches, a promising candidate is the "chemical modification strategy", which involves application of chemicals to RNA that are sensitive to structure and that result in modifications that can be assayed via sequencing technologies. One approach that can reveal paired nucleotides via chemical modification followed by sequencing is SHAPE, and it has been used in conjunction with capillary electrophoresis (SHAPE-CE) and high-throughput sequencing (SHAPE-Seq). The solution of mathematical inverse problems is needed to relate the sequence data to the modified sites, and a number of approaches have been previously suggested for SHAPE-CE, and separately for SHAPE-Seq analysis. Here we introduce a new model for inference of chemical modification experiments, whose formulation results in closed-form maximum likelihood estimates that can be easily applied to data. The model can be specialized to both SHAPE-CE and SHAPE-Seq, and therefore allows for a direct comparison of the two technologies. We then show that the extra information obtained with SHAPE-Seq but not with SHAPE-CE is valuable with respect to ML estimation.

关键词： chemicals RNA Maximum likelihood estimation Optimization Educational institutions Shape

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Direct imprinted gratings on nanoporous gold as effective SERS substrates

Direct imprinted gratings on nanoporous gold as effective SE...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Yang Jiao Judson D. Ryckman Marco Liscidini John E. Sipe Peter N. Ciesielski Carlos A. Escobar G. Kane. Jennings Sharon M. Weiss Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Dipartimento di Fisica A. Volta Università degli Studi di Pavia Pavia Italy Department of Physics and Institute for Optical Sciences University of Toronto Toronto ONT Canada Department of Chemical and Biomolecular Engineering Vanderbilt University Nashville TN USA

ISBN: (纸本)9781557529107

关键词： Substrates Gratings Surface morphology Plasmons Films Raman scattering Nanobioscience

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A hierarchical approach for the fabrication of three-dimensional microbattery electrodes

A hierarchical approach for the fabrication of three-dimensi...

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International Solid-State Sensors, Actuators and Microsystems Conference

作者： Gerasopoulos, K. Pomerantseva, E. McCarthy, M. Culver, J. Wang, C. Ghodssi, R. MEMS Sensors and Actuators Laboratory Drexel University College Park MD United States Department of Materials Science and Engineering Drexel University College Park MD United States Institute for Systems Research Drexel University College Park MD United States Department of Electrical and Computer Engineering Drexel University College Park MD United States Department of Plant Sciences and Landscape Architecture Drexel University College Park MD United States Department of Chemical and Biomolecular Engineering Drexel University College Park MD United States Department of Mechanical Engineering and Mechanics Drexel University College Park MD United States University of Maryland College Park MD United States Drexel University Philadelphia PA United States

ISBN: (纸本)9781457701573

The first successful demonstration of virus-structured, hierarchical electrodes for three-dimensional (3-D) Li-ion microbattery architectures is reported in this paper. The electrodes consist of electroplated gold micropillars and virus-structured nanocomposite materials with a TiO2 anode layer deposited on a nickel-coated viral template. Micropatterning increases the active electrode surface area and electrochemical characterization results verify an improvement in microbattery capacity by up to a factor of four compared to nanostructures alone. © 2011 IEEE.

关键词： Viruses

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Deterministic nano-manipulation and immobilization of single quantum dots

Deterministic nano-manipulation and immobilization of single...

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International Symposium Semiconductor Device Research (ISDRS)

作者： Chad Ropp Zachary Cummins Roland Probst Sanghee Nah Sijia Qin Rakesh Kumar Srinivasa R. Ragha-van John T. Fourkas Benjamin Shapiro Edo Waks Department of Electrical and Computer Engineering University of Maryland USA Fischell Department of Bio-Engineering and the Institute for Systems Research University of Maryland USA Fischell Department of Bio-Engineering Institute for Systems Research USA Department of Chemistry and Biochemistry University of Maryland USA Department of Chemical and Biomolecular Engineering University of Maryland USA University of Maryland at College Park College Park MD US University of Maryland Institute for Physical Science and Technology USA

Quantum dots (QDs) are robust single photon emitters with a broad range of application in quantum information processing [1]. There is currently great interest in interacting QDs with nanophotonic structures such as photonic crystals for creating novel quantum devices [2]. For these applications it is essential that the QD with the correct spectral properties be placed in the high field region of the nanophotonic device [3]. A reliable technique for positioning individual QDs with desired properties at the correct location (e.g. a cavity mode) requires the ability to perform particle manipulation. Here we demonstrate a method to manipulate and immobilize preselected single colloidal QDs with nanometer precision by controlling the flow of the surrounding liquid via feedback.

关键词： Quantum dots Fluids USA Councils Arrays Polymers Glass Correlation

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Integrative-omics for translational science-session introduction

Pacific Symposium on Biocomputing 2011, PSB 2011

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Pacific Symposium on Biocomputing 2011, PSB 2011 2011年 1-3页

作者： Bebek, Gurkan Koyutürk, Mehmet Chance, Mark R. Price, Nathan D. Case Center for Proteomics and Bioinformatics Case Western Reserve University 10900 Euclid Ave. Cleveland OH 44106-4988 United States Department of Electrical Engineering and Computer Science Case Western Reserve University 10900 Euclid Ave. Cleveland OH 44106-4988 United States Department of Chemical and Biomolecular Engineering University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana IL 61801 United States

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The impact of changes in environmental and operating conditions on the hydrological performance of septic tank absorption trenches

The impact of changes in environmental and operating conditi...

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作者： Jayarathne, R. Connor, M. Yuen, S. Pivonka, P. Department of Civil and Environmental Engineering University of Melbourne VIC 3010 Australia Department of Chemical and Biomolecular Engineering University of Melbourne VIC 3010 Australia Engineering Computational Biology Group School of Computer Science and Software Engineering University of Western Australia Crawley WA 6009 Australia

ISBN: (纸本)9781617389061

When appropriately designed, installed and managed, septic tank systems provide a reliable disposal method for domestic wastewaters where connection to sewerage is impractical or uneconomic. However, unacceptably high incidences of hydraulic and treatment failures have caused growing disenchantment with septic tanks. Whilst improper installation or mismanagement causes some failures, many are attributable to inadequacies in design guidelines. A major problem is that we lack a good understanding of the impact of operating factors like hydraulic loadings, and of environmental factors like climate, on moisture and pollutant dispersion patterns around septic tank absorption trenches. During a septic tank study undertaken recently in Melbourne, Australia, a numerical model was developed to predict moisture flux patterns around septic tank trenches under differing environmental and operating conditions. This model was calibrated using hydrological measurements taken monthly for a full year at eight septic tanks on silty clay soil sites around Melbourne;soil property values were obtained by physically testing soil samples from these sites. A major finding was that 75% to 90% of combined annual water inflows were being lost by evapo-transpiration. The model was also used to explore how moisture flows around an absorption trench would be influenced by factors such as climatic conditions, hydraulic loads, soil properties and water table depths. This paper presents the outcome of a sensitivity analysis illustrating the changes in moisture dispersion patterns caused by varying these factors and how the likelihood of hydraulic or treatment failures occurring is affected. Implications for septic tank design are discussed.

关键词： Sensitivity analysis

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Transport study of nanoparticles for oilfield application

Transport study of nanoparticles for oilfield application

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作者： Yu, Jie Berlin, Jacob M. Lu, Wei Zhang, Lunliang Kan, Amy T. Zhang, Ping Walsh, Erin E. Work, Sara N. Chen, Wei Tour, James M. Wong, Michael S. Tomson, Mason B. Department of Chemical and Biomolecular Engineering Rice University United States Department of Civil and Environmental Engineering Rice University United States Department of Chemistry Rice University United States Department of Computer Engineering Rice University United States Department of Mechanic Engineering and Materials Science Rice University Houston TX 77005 United States College of Environmental Science and Engineering Nankai University Tianjin 300071 China

ISBN: (纸本)9781617386619

Recently, the revolution of nanotechnology has been noticed for its many potential applications in the oil & gas industry such as enhanced oil recovery process and subsurface mapping. Understanding the transport and retention of nanoparticles (NPs) in an oilfield environment, such as high salinity, high temperature, high pressure, and heterogeneous pore distribution is critical to their application. The objective of this study is to investigate the fundamental transport and retention properties of NPs in the challenging oilfield conditions. In this work, dolomite core material from an oil well in Kuwait and Berea sandstone were used. Carbon NPs were used as model nanomaterials. The core sample was washed with toluene to remove residual oil, ground to 106 - 250 μm grains, and packed into columns. Carbon NP breakthrough curves were collected in synthetic seawater at room temperature. The results showed that the existence of salt ions dramatically delayed NP breakthrough time and increased NP retention. Effects of different types of salts and salt concentrations are discussed. NP transport appears to be highly dependent on the degree of interaction between the NPs, salt ions in solution, and porous medium surface, which affects retardation and retention. NP breakthrough can be significantly improved by avoiding this interaction via NP surface modification. Our preliminary results provided helpful guidelines for NP transport in oil & gas applications. The results are discussed in detail. Furthermore, the experimental results were fitted with a 1-D advective and dispersion equation combined with a first-order removal term to obtain important transport parameters for NPs that did not aggregate. More complicated models are being developed to capture the unusual breakthrough curves associated with NP aggregation. © 2010, Society of Petroleum Engineers.

关键词： Nanoparticles

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Passivity-based model reference robust control for a class of nonlinear systems with input and state measurement delays

Passivity-based model reference robust control for a class o...

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作者： Rodríguez-Seda, Erick J. López-Montesinos, Pedro O. Stipanović, Dušan M. Spong, Mark W. Coordinated Science Laboratory University of Illinois 1308 W. Main St. Urbana IL 61801 United States Chemical and Biomolecular Engineering Department University of Illinois 600 S. Mathews Ave. Urbana IL 61801 United States School of Engineering and Computer Science University of Texas Dallas TX 75080 United States

ISBN: (纸本)9781424474264

This paper presents a model reference robust control framework that guarantees asymptotic stability of a class of nonlinear systems with arbitrarily large constant input and state measurement delays as well as uncertain system parameters. The proposed control framework combines the use of a modified wave scattering transformation to achieve overall stability and to enforce state convergence of the time delay nonlinear system to the desired state independently of unknown initial conditions, transmission losses, and computational errors. A numerical example illustrates the effectiveness of the proposed controller. © 2010 AACC.

关键词： Nonlinear systems

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