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Nanocrystalline material in toroidal cores for current transformer: Analytical study and computational simulations

materials Research 2005年第4期8卷 395-400页

作者： Luciano, Benedito Antonio Cavalcante de Albuquerque, João Marcelo Benício de Castro, Walman Moreira Afonso, Conrado Ramos Department of Electrical Engineering CEEI/UFCG P.B. 10105 58109 970 Campina Grande - PB Brazil Department of Mechanical Engineering CCT/UFCG P.B. 10105 58109-970 Campina Grande - PB Brazil Department of Materials Engineering Pos-Graduate Program in Materials Science Engineering UFSCar Via Washington Luís km 235 13565-905 São Carlos - SP Brazil

Based on electrical and magnetic properties, such as saturation magnetization, initial permeability, and coercivity, in this work are presented some considerations about the possibilities of applications of nanocrystalline alloys in toroidal cores for current transformers. It is discussed how the magnetic characteristics of the core material affect the performance of the current transformer. From the magnetic characterization and the computational simulations, using the finite element method (FEM), it has been verified that, at the typical CT operation value of flux density, the nanocrystalline alloys properties reinforce the hypothesis that the use of these materials in measurement CT cores can reduce the ratio and phase errors and can also improve its accuracy class. © 2005.

关键词： Steel

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Cover Picture: Acceleration of Calcite Kinetics by Abalone Nacre Proteins (Adv. Mater. 22/2005)

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Advanced materials 2005年第22期17卷

作者： G. Fu S. R. Qiu C. A. Orme D. E. Morse J. J. De Yoreo Biomolecular Science and Engineering Graduate Program and the Institute for Collaborative Biotechnologies University of California at Santa Barbara Santa Barbara CA 93106 USA Department of Chemistry and Materials Science Lawrence Livermore National Laboratory P.O. Box 808 Livermore CA 94551 USA

Abalone utilizes a system of macromolecular matrices and soluble proteins to produce beautiful and mechanically robust shells. The cover shows work by Qiu and co‐workers reported on p. 2678, in which AP8 proteins isolated from the shell of red abalone are shown to alter the growth of calcite both by accelerating the rate and modifying the shape from the simple rhombohedra seen in the upper left of the scheme to the more complex form seem in the lower right. The changes are made manifest at an atomic scale through alterations in the growth speed and shape of the atomic steps that form the growth hillocks (background).

关键词： Biomineralization Calcination Proteins

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Heterotelechelic poly(ethylene glycol) tethered chain surface on gold for high-performance surface plasmon sensing

Heterotelechelic poly(ethylene glycol) tethered chain surfac...

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Transactions - 7th World Biomaterials Congress

作者： Kato, M. Nagasaki, Y. Uchida, K. Takahashi, T. Kataoka, K. Preventure Program JST Department of Materials Science Tokyo University of Science 2641 Yamazaki Noda 278-8510 Japan Department of Materials Science Graduate School of Engineering University of Tokyo 7-3-1 Kongo Bunkyo-ku Tokyo 113-8656 Japan

ISBN: (纸本)1877040193

The specific sensing of antigen-antibody interaction was examined by using a PEGylated sensor. For the surface modification, acetal-PEG-SH was prepared and by using acetal-PEG-SH, PEG brush was constructed on the gold sensor chip surface. Modification of antibody was carried out by conjugation of SH group in Fab' to the maleimide group at the distal end of PEG chains on the surface. The result shows that the suitable modification of antibody on the PEG brush surface is very important to obtain high sensing character.

关键词： Polyethylene glycols

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Preparation of CdSe/ZnS quantum Dots-PEG-b-PAMA conjugate and application for immunohistochemistry

Preparation of CdSe/ZnS quantum Dots-PEG-b-PAMA conjugate an...

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Transactions - 7th World Biomaterials Congress

作者： Nakamae, M. Takahashi, T. Ishii, T. Nagasaki, Y. Kataoka, K. Preventure Program JST Department of Materials Science Tokyo University of Science Yamazaki2641 Noda 278-8510 Japan Department of Matereals Science Graduate School of Engineering University of Tokyo Hongo 7-3-1 Bunkyo-ku Tokyo 113-8656 Japan

ISBN: (纸本)1877040193

The stable dispersion of quantum dot nanoparticles (QD) in aqueous solution using polymers containing poly(ethylene glycol) (PEG) segment was investigated. It was found that using PEG/poly(2-N,N-dimethylaminoethyl methacrylate) (PEG-b-PAMA) enables stabilization of QD in aqueous phase. The photochemical characteristics of the PEG-modified QD were found to be almost same as unmodified QD. It was observed that as he PEG/PAMA block copolymer-modified QDs possess PEG tethered chains on the surface, it is highly dispersion stable in aqueous media and also showed non-fouling character.

关键词： Semiconductor quantum dots

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Extruded LZS glass-ceramics

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American Ceramic Society Bulletin 2004年第8期83卷

作者： Montedo, O.R.K. Reitz, G.M. Bertan, F.M. De Novaes Oliveira, A.P. Hotza, D. Siligardi, C. Graduate Program in Materials Science and Engineering Federal University of Santa Catarina Florianópolis Brazil Dept. of Materials and Environment Engineering University of Modena and Reggio Emilia Modena Italy

Experimental results regarding Li2O-ZrO2-SiO 2 (LZS) sintered glass ceramic materials obtained by extrusion of glass powders with an added inorganic material as binder, are presented. Each of the composition were characterized by chemical analysis, laser scattering particle-size analysis, differential thermal analysis (DTA), Xray diffractometry (XRD), and thermal expansion. It was observed that after a sintering process at near by 750°C, crystallization takes place as soon as the process gets over. Once heated, the the glass powder compacts crystallize into zircon and quartz and then to lithium disilicate.

关键词： Glass ceramics

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Molecular recognition by stable dispersion of gold nanoparticles modified with heterobifunctional poly (ethylene glycol)

Molecular recognition by stable dispersion of gold nanoparti...

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Transactions - 7th World Biomaterials Congress

作者： Aboshi, F. Takahashi, T. Ishii, T. Nagasaki, Y. Otsuka, Hidenori Kataoka, K. Pre-venture Program JST 4-1-8 Hon-machi Kawaguchi Saitama 332-0012 Japan Department of Materials Science Tokyo University of Science 2641 Yamazaki Noda Chiba 278-8510 Japan Department of Matereals Science Graduate School of Engineering University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan

ISBN: (纸本)1877040193

The stability of gold nanoparticles modified with heterobifunctional poly (ethylene glycol) (PEG) were investigated. An effective method for preparing hetero-bifunctional PEG by anionic ring-opening polymerization was also developed. Streptavidin-PEG gold nanoparticle showed extremely high response with biotinylated surface plasmon resonance (SPR) sensors. PEG-modified gold nanoparticles showed remarkable stability in physiological conditions, such as the solution of high ionic strength.

关键词： Nanostructured materials

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PH dependence of polypseudorotaxane formation between cationic linear polyethylenimine and cyclodextrins

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Macromolecules 2004年第18期37卷 6705-6710页

作者： Choi, Hak Soo Ooya, Tooru Lee, Sang Cheon Sasaki, Shintaro Kurisawa, Motoichi Uyama, Hiroshi Yui, Nobuhiko School of Materials Science Japan Adv. Inst. Sci. and Technol. 1-1 Asahidai Tatsunokuchi Ishikawa 923-1292 Japan Inst. of Bioeng. and Nanotechnology Singapore Science Park II #01-01/10 The Aries 117586 Singapore Department of Materials Chemistry Graduate School of Engineering Osaka University Suita Osaka 565-0871 Japan 21st Century COE Program Japan Adv. Inst. Sci. and Technol. 1-1 Asahidai Tatsunokuchi Ishikawa 923-1292 Japan

A series of linear polyethylenimines (LPEIs) with various molecular weights were synthesized and used for pH-dependent polypseudorotaxane formation with α- or γ-cyclodextrins (α-, γ-CDs). The polypseudorotaxane formation was significantly dependent on the pH of the aqueous media. The maximum yield of the recovered polypseudorotaxane precipitates was observed at pH 11.0, whereas no complexation was observed in the pH range below 8.0 due to the protonation of secondary amine groups in LPEI backbones. This suggests that the ionization of the secondary amine groups leads to dethreading of CD molecules because PEI chains with cationic nature disfavor the hydrophobic cavities of CDs. The solid-state 13C CP/MAS NMR and X-ray diffraction measurements verified the successful formation of crystalline polypseudorotaxanes through the inclusion complexation. In addition, 1H NMR analysis showed that LPEI formed a 2:1 inclusion complex with α-CD ([EI]:[α-CD] = 2:1) and a 4:1 complex with γ-CD ([EI]:[γ-CD] = 4:1) as reported in the poly(ethylene glycol)-based polypseudorotaxane system. Such unique pH-controllable polypseudorotaxane formation may be useful in designing many building blocks for stimuli-responsive polyrotaxanes.

关键词： Polyethylenes

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The effects of process parameters on size, density, structure, and field emission properties of Pd-catalyzed carbon nanotubes synthesized by thermal chemical vapor deposition

The effects of process parameters on size, density, structur...

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International Conference on Vacuum Nanoelectronics (IVNC)

作者： S. Wei W.P. Kang W.H. Hofmeister J.L. Davidson Y.M. Wong J.H. Huang Interdisciplinary Graduate Program in Material Science Vanderbilt University Nashville TN USA Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA Department of Chemical Engineering Vanderbilt University Nashville TN USA Department of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan

In this study, various thicknesses of Pd catalytic films were deposited on Ti/Si substrates and pretreated with NH/sub 3/. The effects of catalyst deposition parameters and NH/sub 3/ pretreatment time (0, 1, and 10 minutes) on the size distribution of Pd catalytic particles, and subsequently, on the diameter and density of synthesized carbon nanotubes (CNTs) were investigated. The CNTs were synthesized by thermal CVD at 750/spl deg/C using methane (CH/sub 4/) as the carbon source, and a mixture of Ar/H/sub 2/ (80 vol.%/20 vol.%) as the carrier gas.

关键词： Carbon nanotubes Chemical vapor deposition Argon Hydrogen Scanning electron microscopy Morphology Substrates materials science and technology Transmission electron microscopy Carbon dioxide

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Transistor characteristics of thermal CVD carbon nanotubes field emission triode

Transistor characteristics of thermal CVD carbon nanotubes f...

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International Conference on Vacuum Nanoelectronics (IVNC)

作者： Y.M. Wong W.P. Kang J.L. Davidson W. Hofmeister S. Wei J.H. Huang Dept. of Electrical Engineering and Computer Science Vanderbilt Univ. Nashville TN USA Interdisciplinary Graduate Program in Material Science Vanderbilt Univ. Nashville TN USA Dept. of Materials Science and Engineering National Tsing Hua Univ. Hsinchu Taiwan ROC

In this paper, the study of thermal CVD grown CNT field emitters in a triode amplifier configuration is reported. The DC characteristics of the CNT triode are investigated, including I/sub a/ vs. V/sub a/ for different V/sub g/. Moreover, DC parameters such as transconductance, amplification factor and anode resistance of the triode amplifier are determined. It was shown that a higher amplification factor can be achieved with optimum gate-anode-cathode spacing such that the cathode is effectively shielded from the anode by the gate but the anode still collects all electrons emitted from the cathode. High emission current at low gate voltage is key to achieving high transconductance. This can be obtained by optimum configuration of high-density CNTs array in a triode structure with a common gate.

关键词： Carbon nanotubes Voltage Anodes materials science and technology Current measurement Palladium Silicon Furnaces Temperature Cathodes

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Effects of Surface Roughness and Maximum Load on the Mechanical Properties of Cancellous Bone Measured by Nanoindentation

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MRS Online Proceedings Library 2004年第1期823卷 W8.5.1-W8.5.6页

作者： Donnelly, Eve Baker, Shefford P. Boskey, Adele L. van der Meulen, Marjolein C. H. Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca USA Department of Materials Science and Engineering Cornell University Ithaca USA Musculoskeletal Integrity Program Hospital for Special Surgery New York USA Department of Biochemistry Weill Medical College of Cornell University New York USA Graduate Program in Physiology Biophysics and Systems Biology Weill Medical College of Cornell University New York USA

Nanoindentation was used to assess the mechanical properties of lamellar and interlamellar tissue in dehydrated rabbit cancellous bone. The effects of surface roughness and maximum nanoindentation load on the measured mechanical properties were examined in two samples of differing surface roughness using maximum loads ranging from 250-3000 μN. As the ratio of indentation depth to surface roughness decreased below approximately 3:1, the variability in material properties increased substantially. At low loads, the indentation modulus of the lamellar bone was approximately 20% greater than that of the interlamellar bone, while at high loads the measured properties of both layers converged to an intermediate value. Relatively shallow indentations made on smooth surfaces revealed significant differences in the properties of lamellar and interlamellar bone that are consistent with microstructural observations of lamellar bone as more mineralized than interlamellar bone.

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