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Magnetic fibre and paper for information storage

Paper Asia 2006年第3期22卷 31-33页

作者： Ong, B.H. Zakaria, S. Ahmad, S. Abdullah, M. Yusoff, M.N.M. Liang, M.S. Van De Ven, T.G.M. Faculty of Engineering Multimedia University Jalan Multimedia Selangor Darul Ehsan Malaysia Materials Science Program School of Applied Physics Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Physics Program School of Applied Physics Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Wood Chemistry Division Forest Research Institute Malaysia Kepong 52109 Kuala Lumpur Malaysia Department of Mechanical Engineering College of Engineering Universiti Tenaga Nasional Km 7 Jalan Kajang - Puchong 43009 Kajang Selangor Malaysia Department of Chemistry Pulp and Paper Research Centre McGill University Montreal H3A 2A7 Canada

Magnetic paper via lumen loading process was prepared from neverdried and dried kraft pulp. Polyethylenimine (PEI) was used as retention aid during the inter-stage treatment. The paper produced from the magnetic pulp showed an increase of magnetic properties as the loading increased. The physical properties of the paper such as tensile index, burst index, tear and folding endurance showed a reduction in the strength value as the loading capacity increased. The lumen-loaded paper shows better physical properties than conventionally loaded paper. The flocculation study shows that the magnetic colloid exists in multi particles aggregates form in water solution, which caused by magnetodipole interaction.

关键词： Papermaking

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Dynamics of Prestressed Semiflexible Polymer Chains as a Model of Cell Rheology

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Physical Review Letters 2006年第16期97卷 168101-168101页

作者： Noah Rosenblatt Adriano M. Alencar Arnab Majumdar Béla Suki Dimitrije Stamenović Department of Biomedical Engineering Boston University 44 Cummington Street Boston Massachusetts 02215 USA Physiology Program Department of Environmental Health Harvard School of Public Health Boston Massachusetts 02115 USA Department of Physics Boston University Boston Massachusetts 02215 USA

We report on a model of a prestressed nonlinear semiflexible polymer chain that links thermally driven dynamics to the creep behavior of living cells. Numerical simulations show that the chain’s creep follows a power law with an exponent that decreases with increasing prestress. This is related to the propagation of free energy through the chain in response to stretching, where the propagation speed is regulated by the prestress via the chain’s nonlinear elasticity. These results indicate that the main aspects of cell rheology are consistent with the dynamics of single polymer chains under tension.

关键词： Polymers

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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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Quantitative, noninvasive optical sensing in tissue engineered oral mucosal constructs

Quantitative, noninvasive optical sensing in tissue engineer...

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Biomedical Topical Meeting, BIO 2006

作者： Vishwanath, Karthik Izumi, Kenji Chandra, Malavika Feinberg, Stephen E. Mycek, Mary-Ann Department of Biomedical Engineering University of Michigan Ann Arbor MI 48109-2099 United States Department of Oral and Maxillofacial Surgery University of Michigan Ann Arbor MI 48109-2099 United States Applied Physics Program University of Michigan Ann Arbor MI 48109-2099 United States Comprehensive Cancer Center University of Michigan Ann Arbor MI 48109-2099 United States

ISBN: (纸本)1557528071

Noninvasive characterization of ex-vivo produced oral-mucosal equivalent (EVPOME) tissues was simulated using a Monte Carlo code to predict spatially-resolved fluorescence in a multi-layered tissue model. Relative contributions to surface fluorescence from endogenous fluorophores were quantified. © 2006 Optical Society of America.

关键词： Tissue

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Fluorescence lifetime imaging microscopy detects altered metabolic function in living human cancer cell models

Fluorescence lifetime imaging microscopy detects altered met...

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Biomedical Topical Meeting, BIO 2006

作者： Sud, Dhruv Zhong, Wei Beer, David Mycek, Mary-Ann Dept. of Biomedical Engineering University of Michigan Ann Arbor MI 48109-2099 United States Dept. of Surgery University of Michigan Ann Arbor MI 48109-2099 United States Comprehensive Cancer Center University of Michigan Ann Arbor MI 48109-2099 United States Applied Physics Program University of Michigan Ann Arbor MI 48109-2099 United States

A unique FLIM system sensed key molecules involved in metabolic pathways in living cellular models of human esophageal cancer progression. Functional imaging studies revealed endogenous, optical biomarkers that are cl... 详细信息

ISBN: (纸本)1557528071

关键词： Metabolism

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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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Electrical Transport in Transparent Conducting Tin‐doped Indium Oxide Films

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AIP Conference Proceedings 2006年第1期850卷 1548-1549页

作者： S. S. Yeh J. Y. Lu M. W. Shiu J. J. Lin Institute of Physics National Chiao Tung University Hsinchu 30010 Taiwan Electrical Engineering and Computer Science Undergraduate Honor Program National Chiao Tung University Hsinchu 30010 Taiwan Department of Electrophysics National Chiao Tung University Hsinchu 30010 Taiwan

We have studied the temperature behavior of the electrical resistivities ρ(T) in a series of tin‐doped indium‐oxide films with different residual resistivities ρ0 varying from 218 to 568 μΩ cm. We found that the temperature dependence of ρ can be well described by the Bloch‐Grüneisen law from 300 K down to about 100 K. In particular, we observed that the strength of the electron‐phonon coupling, βBG (which characterizes a prefactor in the Bloch‐Grüneisen formula) increases linearly with increasing ρ0. This result is not understood in terms of current theoretical concept for electron‐phonon interaction in metals.

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On the adhesive properties of vinyl-acrylic latex particles functionalized with acrylic acid

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International Journal of Polymeric Materials and Polymeric Biomaterials 2006年第3期55卷 187-201页

作者： Soto, N. Sanmiguel, M. Reyes, Y. Domínguez, M.A. Duda, Y. Vázquez, F. National Starch and Chemicals Carr. Toluca-Mexico Mexico Mexico Molecular Engineering Program Instituto Mexicano del Petróleo Eje Central Norte 152 México D.F. Mexico Institute for Condensed Matter Physics NASS of Ukraine Lviv Ukraine Molecular Engineering Program Instituto Mexicano del Petróleo Eje Central Norte Lazaro Cardenas 152 07730 México D.F. Mexico

A series of pressure-sensitive adhesives, based on vinyl acetate (VA) and butyl acrylate (BuA) and functionalized with small amounts of acrylic acid (AA), were synthesized by semicontinuous emulsion polymerization. This technique allowed preparing latex particles with high monodispersity and pre-defined particle size. The influence of the VA/BuA ratio on the tack, peel, and shear strength of the coatings was investigated. To explain the dependence of adhesive properties (shear, peel, and tack) on particle composition, a Monte Carlo simulation based on a simple model was used to understand the film formation process. The simulation showed that dense adlayers were formed from dispersions containing a relative high content of BuA. Experimental testing showed that films with a low VA/BuA ratio (30/70) exhibited moderate values of shear resistance due to well-structured layers formation, with improved tack and peel properties. A positive influence of functionalization on the adhesive properties was observed at low AA content (1% w.) in coatings enriched in BuA, as a result of surface particle saturation with charged groups.

关键词： Adhesives

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Magnetic and Magnetoelastic Properties of Chromium Substituted Cobalt Ferrite

Magnetic and Magnetoelastic Properties of Chromium Substitut...

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International Conference on Magnetics (INTERMAG)

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

In the present study, A series of polycrystalline chromium-substituted cobalt ferrite samples with compositions of CoCr x Fe 2-x O 4 were prepared by standard powder ceramic techniques. The microstructure and final composition of the samples were characterized using a scanning electron microscope with energy-dispersive X-ray spectroscopy (EDX). The crystal structure of the samples was determined by X-ray diffractometry to be cubic spinel. Curie temperature, T c , was determined by measuring magnetization as a function of temperature in a vibrating sample magnetometer (VSM). Magnetostriction as a function of applied field was measured using the strain gauge method. The results show that Cr substitution has more profound effects on the Curie temperature and magnetoelastic properties of cobalt ferrite than does Mn substitution.

关键词： Magnetic properties Chromium Cobalt Ferrites Temperature Magnetostriction Magnetic field measurement Strain measurement Iron Powders

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The Effect of Cr-Substitution on the Magnetic Anisotropy and Its Temperature Dependence in Cr-Substituted Cobalt Ferrite

The Effect of Cr-Substitution on the Magnetic Anisotropy and...

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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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