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2nd International Conference on Advances in materials and Manufacturing Processes (ICAMMP 2011)

作者： Wu, Yu-Chi Lu, Cheng-Lung Huang, Chun-Chen Lin, Jing-Yuan Chen, Meng-Jen Chen, Wen-Shiush Chiang, Hsien-Yin Department of Electrical Engineering National United University Taiwan Department of Electrical Engineering National Dong Hua University Taiwan Department of Electrical Engineering National Kaohsiung University of Applied Science Taiwan Ph. D. Program in Materials and Chemical Engineering National United University Taiwan

ISBN: (纸本)9783037853283

Wind power has been recognized as one of the important green energy resources in Taiwan. However, installing large-capacity wind generators needs to meet many environmental regulations, limiting the penetration of wind power to households/communities. In this paper, the design of a novel double-deck vertical-axis wind generator for households is presented, hoping "many a little makes a mickle" and making better use of green energy to reduce carbon emission. The proposed wind generator is an axial-flux permanent-magnet (PM) synchronous generator, which design is different from other existing wind generators in several aspects: (1) double decks for double wind turbines vs. single turbine, (2) silicon-steel-lamination-cored vs. air-cored for armature coils, and (3) axial-flux PM generator vs. conventional PM generator. The performance of the proposed design is simulated with the aid of a finite element software package. The experimental results are consistent with the simulation. The prototype of the proposed wind generator is also compared with a commercial mini wind generator on the market. The proposed wind generator produces satisfactory results.

关键词： Green Energy Vertical Axis Wind Generator

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Effect of Film Thickness Variation on (100)-Surface Texturing of MPS Processed Polycrystalline Si Films

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MRS Online Proceedings Library 2012年第1期1426卷 257-262页

作者： Monica Chahal P. C. van der Wilt D. Van Gestel A. B. Limanov A. M. Chitu James S. Im Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York USA IMEC Solar Cell Tech. Group Leuven Belgium WCU Program Department of Materials Science and Engineering College of Engineering Korea Advanced Institute of Science and technology (KAIST) Korea

We have investigated the effect of varying the film thickness on the surface orientation texturing in polycrystalline Si films obtained via mixed-phase solidification (MPS) of initially a-Si precursor films on SiO2. It is found that, for a given number of MPS exposure cycles, the degree of (100)-surface texturing is reduced as the film thickness is increased. We discuss how this trend can be accounted for by the previously proposed thermodynamic model of MPS, wherein a decreasing local solid/liquid interface curvature with increasing film thickness is identified as the primary cause for decreasing the influence which anisotropic solid-Si/SiO2 interfacial energies have on the survivability of the grains. This, in turn, leads to other factors becoming more significant in determining the grains that survive the MPS cycle, thereby reducing the degree of (100)-surface texturing in the resulting films.

关键词： Si microstructure texture

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Nano desalinator by electrostatic ion sieving for low-power water purification

Nano desalinator by electrostatic ion sieving for low-power ...

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16th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2012

作者： Lin, Chin-Yu Huang, Yu-Sheng Chang, Chia-Jung Chang, Wen-Chih Chueh, Yu-Lun Tseng, Fan-Gang Department of Engineering and System Science National Tsing Hua University Taiwan Department of Materials Science and Engineering National Tsing Hua University Taiwan Research Center for Applied Sciences Division of Mechanics Academia Sinica Taiwan ITRI South Microsystem Technology Center Industrial Technology Research Institute Taiwan

ISBN: (纸本)9780979806452

This paper proposes to manipulate the thickness of the electro-double-layer (EDL) inside the anodic aluminum oxide (AAO) nanochannels as a virtual filter to select uni-ions for desalination through electrical static charges. Due to the electric static sieving effect at larger channel diameter (~100 nm), the power consumption is much less than those by tradition methods, such as reverse-osmosis (RO) and electrodialysis (ED) which need to function in much smaller nano pores or channels of 1 nm. This method has demonstrated the desalination rate at 55% and the pumping power consumption is estimated 0.2 kwh, which is decreased 1 order to that by RO method.

关键词： Purification

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Effect of film thickness variation on (100)-surface texturing of MPS processed polycrystalline Si films

Effect of film thickness variation on (100)-surface texturin...

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2012 MRS Spring Meeting

作者： Chahal, Monica Van Der Wilt, P.C. Van Gestel, D. Limanov, A.B. Chitu, A.M. Im, James S. Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY United States IMEC Solar Cell Tech. Group Leuven Belgium Korea Republic of Coherent GmbH Göttingen Germany

ISBN: (纸本)9781605114033

We have investigated the effect of varying the film thickness on the surface orientation texturing in polycrystalline Si films obtained via mixed-phase solidification (MPS) of initially a-Si precursor films on SiO 2. It is found that, for a given number of MPS exposure cycles, the degree of (100)-surface texturing is reduced as the film thickness is increased. We discuss how this trend can be accounted for by the previously proposed thermodynamic model of MPS, wherein a decreasing local solid/liquid interface curvature with increasing film thickness is identified as the primary cause for decreasing the influence which anisotropic solid-Si/SiO2 interfacial energies have on the survivability of the grains. This, in turn, leads to other factors becoming more significant in determining the grains that survive the MPS cycle, thereby reducing the degree of (100)-surface texturing in the resulting films. © 2012 materials Research Society.

关键词： Film thickness

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Kenaf fiber nonwoven composites as automotive interior material: Mechanical, thermal, and acoustical performance

Kenaf fiber nonwoven composites as automotive interior mater...

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2012 SAMPE International Symposium and Exhibition - Emerging Opportunities: materials and Process Solutions

作者： Hao, Ayou Zhao, Haifeng Jiang, Wei Chen, Jonathan Texas Materials Institute Materials Science and Engineering Program University of Texas at Austin Austin TX 78712 United States School of Human Ecology University of Texas at Austin Austin TX 78712 United States Department of Aerospace Engineering and Engineering Mechanics University of Texas at Austin Austin TX 78712 United States

ISBN: (纸本)9781934551127

With an industrial trend of going green, the use of natural fibers in polymer composites is growing rapidly, especially in the automotive industry. The objectives of this research are to investigate the processability of kenaf fibers in making nonwoven composites for automotive interior parts and to explore the composite end-use performance in terms of physical structure, mechanical properties, thermal stability, and acoustical behavior. The kenaf/polypropylene(KF/PP) composites were fabricated with 50/50 blend ratio by weight. All nonwovens were produced by carding and needle-punching techniques and thermally bonded by a panel press. The tensile, three-point bending and in-plane shearing tests were performed to evaluate the composite mechanical properties. Based on the mechanical tests, the optimum processing conditions were determined. Dynamic mechanical analysis (DMA) was used to measure the thermal-mechanical properties of composites. The sound absorption and sound insulation performance was evaluated. The correlation between mechanical properties and acoustical behavior was also verified by the panel resonance theory.

关键词： Automotive industry

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Epidermal Electronics: materials and Optimized Designs for Human‐Machine Interfaces Via Epidermal Electronics (Adv. Mater. 47/2013)

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Advanced materials 2013年第47期25卷

作者： Jae‐Woong Jeong Woon‐Hong Yeo Aadeel Akhtar James J. S. Norton Young‐Jin Kwack Shuo Li Sung‐Young Jung Yewang Su Woosik Lee Jing Xia Huanyu Cheng Yonggang Huang Woon‐Seop Choi Timothy Bretl John A. Rogers Department of Materials Science and Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Medical Scholars Program Neuroscience Program University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Neuroscience Program University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA School of Display Engineering Hoseo University Asan 336‐795 Republic of Korea Department of Mechanical engineering Pohang University of Science and Technology Pohang 790‐784 Republic of Korea Center for Mechanics and Materials Tsinghua University Beijing 100084 China Department of Civil and Environmental Engineering Department of Mechanical Engineering Center for Engineering and Health Northwestern University Evanston Illinois 60208 USA Department of Engineering Mechanics Tsinghua University Beijing 100084 China Department of Civil and Environmental Engineering Department of Mechanical Engineering Center for Engineering and Health Northwestern University Evanston Illinois 60208 USA Department of Civil and Environmental Engineering Department of Mechanical Engineering Center for Engineering and Health Northwestern University Evanston Illinois 60208 USA Department of Aerospace Engineering University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA Department of Materials Science and Engineering Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana Illinois 61801 USA

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Experimental investigation of transitional size effect and crack length effect in concrete fracture

Experimental investigation of transitional size effect and c...

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3rd International Symposium on Life-Cycle Civil engineering, IALCCE 2012

作者： Hoover, C.G. Bažant, Z.P. Wendner, R. Vorel, J. Hubler, M.H. Kim, K. Gattu, M. Kirane, K. Le, J.-L. Yu, Q. Theoretical and Applied Mechanics Program Northwestern University Evanston IL United States Civil and Mechanical Engineering and Materials Science Northwestern University Evanston IL United States Department of Civil and Environmental Engineering Northwestern University Evanston IL United States Department of Mechanical Engineering Northwestern University Evanston IL United States Department of Civil Engineering University of Minnesota Minneapolis MN United States Department of Civil and Environmental Engineering University of Pittsburgh Pittsburgh PA United States

ISBN: (纸本)9780415621267

For life cycle analysis, it is essential to know the structure capacity at a given point in time. Determining the strength from equations that do not consider the size effect can lead to insufficient maintenance plans, higher costs and potentially unsafe structures. With this aim, the 'Type 2' size effect, valid for structures that develop large cracks prior to reaching the maximum load, and 'Type 1' size effects, for structures with no pre-existing crack, have each been widely investigated and are quite different. In practice, however, a pre-existing crack at maximum load can be neither large nor negligible compared to the structure dimensions. Therefore, the Type 1-Type 2 transition is important. To determine it, and clarify the role of crack length, a large-scale experimental program, consisting of more than 120 geometrically similar three-point bend beams of 4 sizes, with the size range of 1:12.5, as well as 24 cylinders and 12 beams for ASTM flexural strength tests, has been undertaken. At the time of writing, only partial results are available. A detailed journal article is in preparation.

关键词： Cracks

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A Directional Entropic Force Approach to Assemble Anisotropic Nanoparticles into Superlattices†

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Angewandte Chemie 2013年第52期125卷

作者： Kaylie L. Young Michelle L. Personick Michael Engel Pablo F. Damasceno Stacey N. Barnaby Reiner Bleher Tao Li Sharon C. Glotzer Byeongdu Lee Chad A. Mirkin Department of Chemistry and International Institute for Nanotechnology Northwestern University 2145 Sheridan Road Evanston IL 60208 (USA) Department of Chemical Engineering Department of Materials Science & Engineering Applied Physics Program University of Michigan North Campus Research Complex 2800 Plymouth Road Ann Arbor MI 48109 (USA) Department of Materials Science and Engineering Northwestern University 2200 Campus Drive Evanston IL 60208 (USA) X‐ray Science Division Argonne National Laboratory 9700 South Cass Avenue Argonne IL 60439 (USA)

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DC and AC gate-bias stability of nanocrystalline silicon thin-film transistors made on colorless polyimide foil substrates

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2011 MRS Spring Meeting

作者： Chiu, I.-Chung Cheng, I.-Chun Chen, Jian Z. Huang, Jung-Jie Chen, Yung-Pei Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei 10617 Taiwan Department of Electrical Engineering National Taiwan University Taipei 10617 Taiwan Institute of Applied Mechanics National Taiwan University Taipei 10617 Taiwan Department of Materials Science and Engineering MingDao University Changhua 52345 Taiwan Display Technology Center Industrial Technology Research Institute Hsinchu 31040 Taiwan

ISBN: (纸本)9781605112985

Staggered bottom-gate hydrogenated nanocrystalline silicon (nc-Si:H) thin-film transistors (TFTs) were demonstrated on flexible colorless polyimide substrates. The dc and ac bias-stress stability of these TFTs were investigated with and without mechanical tensile stress applied in parallel to the current flow direction. The findings indicate that the threshold voltage shift caused by an ac gate-bias stress was smaller compared to that caused by a dc gate-bias stress. Frequency dependence of threshold voltage shift was pronounced in the negative gate-bias stress experiments. Compared to TFTs under pure electrical gate-bias stressing, the stability of the nc-Si:H TFTs degrades further when the mechanical tensile strain is applied together with an electrical gate-bias stress. © 2011 materials Research Society.

关键词： Thin film transistors

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Self-assembled clusters of spheres related to spherical codes

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Physical Review E 2012年第4期86卷 041124-041124页

作者： Carolyn L. Phillips Eric Jankowski Michelle Marval Sharon C. Glotzer Applied Physics Program University of Michigan Ann Arbor Michigan 48109 USA Department of Chemical Engineering University of Michigan Ann Arbor Michigan 48109 USA Department of Materials Science and Engineering University of Michigan Ann Arbor Michigan 48109 USA

We consider the thermodynamically driven self-assembly of spheres onto the surface of a central sphere. This assembly process forms self-limiting, or terminal, anisotropic clusters (N-clusters) with well-defined structures. We use Brownian dynamics to model the assembly of N-clusters varying in size from two to twelve outer spheres and free energy calculations to predict the expected cluster sizes and shapes as a function of temperature and inner particle diameter. We show that the arrangements of outer spheres at finite temperatures are related to spherical codes, an ideal mathematical sequence of points corresponding to the densest possible sphere packings. We demonstrate that temperature and the ratio of the diameters of the inner and outer spheres dictate cluster morphology. We present a surprising result for the equilibrium structure of a 5-cluster, for which the square pyramid arrangement is preferred over a more symmetric structure. We show this result using Brownian dynamics, a Monte Carlo simulation, and a free energy approximation. Our results suggest a promising way to assemble anisotropic building blocks from constituent colloidal spheres.

关键词： MOLECULAR self-assembly MICROCLUSTERS THERMODYNAMICS ANISOTROPY BROWNIAN motion processes GIBBS' free energy TEMPERATURE effect CODING theory

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