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Low Resistivity-Highly Transparent Zno:Ga Tco's Grown by Laser Ablation

MRS Online Proceedings Library (OPL) 2011年第1期397卷 247-247页

作者： J. M. Siqueiros J.A. Díaz O. Contreras G.A. Hirata J. McKittrick Instituto de Física-UNAM Apdo. Postal 2681 Ensenada B.C. C.P. 22860 México. Dept. of Applied Mechanics and Engineering Sciences and Materials Science Program University of California San Diego La Jolla CA 92093-0411

Highly transparent with low electrical resistivity gallium-doped zinc oxide (ZnO:Ga) thin films were prepared on glass by Pulsed Laser Deposition at different substrate temperatures. ZnO:Ga evaporation targets were prepared by pressing and sintering powder materials obtained with a novel combustion synthesis *** excellent transmittance of more than 85% in the visible range and a low sheet resistance value as low as 13 Ω/sq. were measured on a 200 nm thickness film grown at Ts=300°C. From optical measurements we observed an increase in the ZnO:Ga bandgap when the substrate temperature is raised from 150°C to 300°C. With this, a remarkable improvement in the blue-green region transmittance is obtained.X-Ray diffraction patterns indicate that the films grow highly oriented in the basal plane direction (c-axis) of the hexagonal ZnO grains.

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Electrospinning and characterization of aligned nanofibers from chitosan/polyvinyl alcohol mixtures: Comparison of several target devices newly designed

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Journal of Fiber science and Technology 2011年第5期67卷 103-108页

作者： Afifi, Amalina M. Yamamoto, Masaki Yamane, Hideki Kimura, Yoshiharu Salmawy, Ahmed El Nakano, Shigeyuki Division of Materials and Life Science Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Kyoto 606-8585 Japan Division of Macromolecular Science and Engineering Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Kyoto 606-8585 Japan Dept. of Bio-based Materials Science Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Kyoto 606-8585 Japan Apparel Department Faculty of Applied Arts Helwan University Cairo Egypt Technical Support Center for Textiles Industries Hyogo Prefectural Institute of Technology 1790-496 Uenodan Nomura-cho Nishiwaki Hyogo 677-0054 Japan Department of Mechanical Engineering Faculty of Engineering University of Malaya 50603 Kuala Lumpur Malaysia

Electrospinning of pure chitosan or chitosan/poly(vinyl alcohol) (PVA) (blend) was carried out with an optimization of the electrospinning conditions. The electrospinning of the pure chitosan was only possible at a relatively high electric field of 5 kV/cm into fibers with a diameter as thick as 30 ìm, and its reproducibility was very poor. Blending of PVA into chitosan significantly improved the spinnability and the chitosan/PVA blend fiber was electrospun for further characterization. Several target devices were designed and examined to collect aligned nanofibers of chitosan/PVA. The most efficient was a rotating collector having grounded short wire bars arranged on a drum. Over 90 % of electrospun fibers were collected in parallel to the take-up direction with this collector. The fiber alignment was further improved with increasing the collector rotation speed up to a maximum speed of 4.7 m/s. The aligned chitosan/PVA fibers were subjected to drawing to 1.5 times and the crystallization of chitosan fractions was induced without indicating the clear crystal orientation.

关键词： Chitosan

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Quality testing of diamond-abrasive, metal-bond grinding tool materials

Quality testing of diamond-abrasive, metal-bond grinding too...

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Optical Fabrication and Testing, OFT 2010

作者： Roll, Christopher D. MacMillin, Brian E. Funkenbusch, Paul Materials Science Program Dept. of Mechanical Engineering University of Rochester Rochester NY 14627 United States

Metal-bond tool materials, with a variety of bonds and diamond compositions, have been characterized mechanically and examined microscopically. The results illustrate the potential use of such testing to track quality... 详细信息

ISBN: (纸本)9781557528933

关键词： materials testing

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Effects of bond hardness and diamond concentration on the erosion of diamond tool materials

Effects of bond hardness and diamond concentration on the er...

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Optical Fabrication and Testing, OFT 2010

作者： Roll, Christopher D. MacMillin, Brian E. Funkenbusch, Paul Materials Science Program Dept. of Mechanical Engineering University of Rochester Rochester NY 14627 United States

Erosion of the tool material during deterministic microgrinding is essential to produce self-sharpening. In this study the effect of bond hardness and diamond size on the erosion of bronze-bond, diamond-abrasive tool ... 详细信息

ISBN: (纸本)9781557528933

关键词： Erosion

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Fabrication of super-elastic Ti-10V-2Fe-3Al alloy compacts by MIM process

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2011年第6期58卷 361-366页

作者： Sagara, Kensaku Nishida, Minoru Kang, Hyungoo Tsumori, Fujio Miura, Hideshi Nakayama, Hideki Dept. Intelligent Machinery and Systems Graduate School Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Dept. Applied Science for Electronics and Materials Kyushu University 6-1 Kasuga Park Kasuga 816-8580 Japan Dept. Mechanical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Castern Co. Ltd. 1808-1 Nakatsuhara Miyuki-Cho Fukuyama Hiroshima 720-0004 Japan

Titanium alloys have been used especially as aerospace, medical and dental materials because of their excellent attributes of high corrosion resistance and high specific strength. A Ti-10V-2Fe-3Al is one ofβ-titanium alloy and it shows super-elasticity. In this study, the fabrication of super-elastic Ti-10V-2Fe-3Al alloy compacts by metal injection molding which is one of near net shape forming of powders was investigated using mixed elemental and alloy powders. Under the optimized MIM process condition, nearly full density (97∼98 %) was obtained and the tensile properties of strength and elongation were 1000∼ 1050 MPa and around 5 %, respectively. Moreover, after solution treatment and aging, the compacts with alloy powder showed clearly super-elasticity.

关键词： Titanium alloys

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In Vitro Behavior and Design of a New Type Implant with Nanostructured Surface

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MRS Online Proceedings Library 2011年第1期1316卷 1-6页

作者： J. C. Mirza Rosca D. Raducanu Gonzalez D. Martin J. A. Garcia Lorente C. Vasilescu Las Palmas de Gran Canaria Univ. Mechanical Eng. Dept. Tafira Gran Canaria Spain Politehnica Univ. of Bucharest Faculty of Materials Science and Engineering Bucharest Romania Technological Institute of Canarias Las Palmas de Gran Canaria 35001 Spain AIN Cordovilla Pamplona Spain Institute of Physical Chemistry “Ilie Murgulescu” Bucharest Romania

This study was aimed to investigate in vitro and in vivo behavior of a Ti6Al7Nb biomaterial with a nanostructured HA-type coating and also the design and realization of a new special knee implant together with a selection of a suitable animal model for preclinical experimentation of the implants. The metallic material used like substrate alloy for layer deposition was a Ti6Al7Nb alloy obtained by double electron beam melting furnace. In order to obtain a nano-crystalline HA-coating first sodium titanate layer was obtained on the surface and then the implant was immersed in Ringer solution with additional PAW1 biovitroceramic (particles under 20 μm). Different deposition times (5, 10 and 19 days) were employed. Microscopy analysis and corrosion tests of the implants relieves that the nanostructured HA layer after 19 days of immersion shows promising results as regarding the implant employ in preclinical experiments. After a complex design based on knee bone radiography there has been manufactured two different types of devices for the metallic implants: a metallic plate and a pin. Two plates and two pins were implanted in each animal. For in vivo experiments the chosen animal model was the mini-pig because of its strong chirurgical resistance and perfect anesthesia toleration. For the testing 10 animals were used for implantation and one for the control. When the plate is implanted the bone has to have a good blood supply after the cut in order to avoid bone to die. All experimented implants were maintained in the animal during six months and periodically inspected. No sign of infection or another problem were observed during this period.

关键词： biomaterial Ti scanning electron microscopy (SEM)

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Constitutive model for shape memory alloy torsion actuator

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Journal of Harbin Institute of Technology(New Series) 2010年第2期17卷 278-282页

作者：周博冷劲松邹广平刘彦菊周利民 College of Civil Engineering Harbin Engineering University Center for Composite Materials and Structures Harbin Institute of Technology Dept. of Aerospace Science and Mechanics Harbin Institute of Technology Dept. of Mechanical Engineering The Hong Kong Polytechnic University

Shape memory alloy ( SMA) torsion actuator is one of the key approaches realizing adaptive wings in airplanes. In this paper,the actuator is made up of SMA wires and a thin-walled tube,in which the SMA wires are twisted and affixed around the surface of the tube at an angle referenced to the center axis of the tube. A thermo-mechanical constitutive model is developed to predict the thermo-mechanical behaviors of the SMA torsion actuator based on the knowledge of solid mechanics. The relationship between the torsion-angle and tem- perature is numerically calculated by using the thermo-mechanical constitutive model coupled with the SMA phase transformation model developed by Zhou and Yoon. The numerical results are compared with the relative experimental results finished by Xiong and Shen. Influences of the twist-angle of SMA wires and geometrical factors on the primary actuation performances of the SMA torsion actuator are also numerically investigated based on the thermo-mechanical constitutive model coupled with the SMA phase transformation model developed by Zhou and Yoon. Results show that the thermo-mechanical constitutive model can well predict the thermo-mechanical behaviors of the SMA torsion actuator.

关键词： shape memory alloy torsion actuator thermo-mechanical constitutive model

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Prediction of glucose concentration in type 1 diabetic patients using Support Vector Regression

Prediction of glucose concentration in type 1 diabetic patie...

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10th International Conference on Information Technology and Applications in Biomedicine: Emerging Technologies for Patient Specific Healthcare, ITAB 2010

作者： Georga, Eleni I. Protopappas, Vasilios C. Polyzos, Demosthenes Dept. of Materials Science and Engineering Univ. of Ioannina GR 45110 Greece Dept. of Mechanical Engineering and Aeronautics Univ. of Patras GR 26500 Greece

ISBN: (纸本)9781424465606

Diabetic patients must adhere continually to a complex daily regime in order to maintain the blood glucose levels within a safe range. Many factors impact glucose variations such as diet, medication and exercise. This work presents a modeling methodology for glucose prediction in type 1 diabetic patients. The physiological processes related to diabetes (i.e. insulin absorption, gut absorption) as well as the effects of exercise on blood glucose and insulin dynamics are quantified using compartmental models. Furthermore, the method employs Support Vector Machines for Regression to provide predictions of glucose concentration. The predictive capabilities of the resulting model are evaluated using data from three type 1 diabetic patients. The Clarke's Error Grid Analysis is used to assess the clinical utility of the proposed prediction method. © 2010 IEEE.

关键词： Glucose

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Performance of polymer electrolyte membrane fuel cell based on new polymeric ionomers

Performance of polymer electrolyte membrane fuel cell based ...

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International Conference on Digital Manufacturing and Automation

作者： Yin, Yan Du, Qing Okamoto, Kenichi State Key Laboratory of Engines School of Mechanical Engineering Tianjin University Tianjin China Dept. of Advanced Materials Science and Engineering Faculty of Engineering Yamaguchi University Yamaguchi Japan

ISBN: (纸本)9780769542867

In this paper, novel polymer electrolyte membranes (PEMs) based on new sulfonated polyimides have been prepared. These polymers have structure of rigid aromatic polymer backbone and flexible aliphatic side chain terminated with sulfonic acid group. Membrane properties such as proton conductivity and single fuel cell performance are evaluated. Most of the polymeric ionomers showed high potential for application to PEM fuel cells. © 2010 IEEE.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Effect of gaseous hydrogen on cyclic slip behavior around a stage i fatigue crack tip in an iron alloy

Effect of gaseous hydrogen on cyclic slip behavior around a ...

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18th European Conference on Fracture: Fracture of materials and Structures from Micro to Macro Scale, ECF 2010

作者： Takahashi, Yoshimasa Sakamoto, Junji Tanaka, Masaki Higashida, Kenji Noguchi, Hiroshi National Institute of Advanced Industrial Science and Technology 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Dept. of Mechanical Engineering Kyushu University Fukuoka Japan Dept. of Materials Science and Engineering Kyushu University Fukuoka Japan

In order to investigate the effect of gaseous hydrogen on cyclic slip behavior around an early stage (stage Ifatigue crack tip, fatigue crack growth (FCGtests using a single-crystalline Fe-3.2wt.%Si alloy are conducted respectively in a hydrogen atmosphere and in a helium atmosphere. The cross-sectional observations of the crack tips by both electron backscatter diffraction (EBSDmethod and transmission electron microscopy (TEMsuccessfully reveal the following points. In helium atmosphere, FCG is preceded by formation of cell structures and crack propagates along cell boundaries. In hydrogen atmosphere, on the other hand, no cells are seen, and crack growth process is similar to that observed in a stage II type FCG. Crack extension resistance in hydrogen is postulated to be lower than that in helium, indicating that the mode of FCG in hydrogen is more critical than that in helium.

关键词： Single crystals

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