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作者： Vogt, Bryan D. Qiang, Zhe Xue, Jiachen Deng, Guodong Karim, Alamgir Cavicchi, Kevin A. Department of Polymer Engineering University of Akron AkronOH44325 United States Material Science Engineering and Commercialization Program Texas State University San MarcosTX78666 United States

ISBN: (纸本)9780841229662

Cooperative assembly of block copolymers (BCPs) with carbonizable polymer precile route to nanoporous carbon materials with well-defined pore size and morphology. There is a subtle balance in reaction kinetics of the carbonizable precursor and ordering of the BCP that controls the extent and length scale over which the ordered structure persists. The use of low molecular weight precursors such as phenolic resin oligomers (resol) enable processing to further order and orient the ordered domains prior to "locking-in" the structure by thermally crosslinking the carbonizable precursor. Processing with solvent, either by exposure to their vapors or use of low volatility solvents in the casting solution, provides one low temperature route to markedly enhance order, but these nanostructures lack long-range orientation. Directional forces through application of a thermal gradient or shear enable large scale orientation of the nanostructures. © 2014 American Chemical Society.

关键词： Block copolymers

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Numerical simulation of extrusion process of complex aluminum alloy disks

Numerical simulation of extrusion process of complex aluminu...

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materials science and Technology Conference and Exhibition 2014, MS and T 2014

作者： Zhang, Jing Liu, Guihua Feng, Zaixin Golub, Michael Yan, Guangrong Dong, Yongtao Department of Mechanical Engineering Purdue School of Engineering and Technology Indiana University - Purdue University Indianapolis IndianapolisIN46202 United States College of Material Science and Engineering North University of China Taiyuan Shanxi Province 030051 China School of Mechanical Engineering and Automation Beihang University Beijing100191 China Department of Civil and Environmental Engineering New Mexico Institute of Mining and Technology SocorroNM87801 United States

ISBN: (纸本)9781634397230

In extrusion processing of disk shape aluminum alloy components, large extrusion forces are typically required to form flange, holes, and rib structures. This study is aimed to design an efficient extrusion process using a numerical simulation method. A finite element based model was established to simulate the extrusion process to form complex aluminum alloy disks. The flow velocity, stress, and extrusion temperature effects on extrusion were studied. The results show that potential damage occurs around the flange. Extrusion forces decrease with increasing temperature. Copyright © 2014 MS&T14®.

关键词： Flow velocity

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Fine control of carbon-polyelectrolyte thin film sensors sensitivity for human motion monitoring

Fine control of carbon-polyelectrolyte thin film sensors sen...

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Fifth Asia International Symposium on Mechatronics (AISM 2015)

作者： S. Seo J. J. Park Y. T. Park Myongji University Seodaemun-gu Seoul KR Department of Chemical and Biomolecular Engineering (BK21+Graduate Program) Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 305-701 Republic of Korea Department of Mechanical Engineering Myongji University 116 Myongji-ro Cheoin-gu Youngin Gyeonggi-do 449-728 Republic of Korea

Carbon nanomaterials have emerged as highly promising nanomaterials for recent thirty years. There have been numerous researches regarding potential applications of carbon nanomaterials due to their outstanding properties which originate from the network of sp2-hybridized carbon atoms. In this regard, it is also reported that a variety of functional composites or hybrid materials with carbon nanomaterials result in novel applications as well as synergistic enhancements in target properties. In this study, multi-functional polymer/graphene nanoplatelet multilayer composite films were fabricated by layer-by-layer assembly. Graphene nanoplatelets (GNPs), two-dimensional carbon nanomaterials provide not only excellent electrical conductivity but barrier property for gas molecules. Layer-by-layer assembly is a simple, inexpensive bottom-up techniques for multilayer film deposition with easy control of inner structures. In this study, transparent conductor for next generation flexible electronics was considered as a potential application of layer-by-layer assembled polymer/GNP multilayer composites films. GNP coating on thin polymer substrates was expected to be applicable to flexible display applications, while metal oxides such as indium tin oxide have a limitation due to its mechanical fragility. Thus, electrically conductive layer-by-layer assembled GNP films which shows gas barrier property as well as mechanical flexibility could be fabricated with low material and processing cost. Though thermal annealing and acid treatment on GNP films effectively lowered the sheet resistance of the films, their transmittance and sheet resistance still need to improve further to be used as transparent conductors for flexible display applications. Meanwhile, further efforts must be focused on the possibility of other applications.

关键词： Carbon nanotube Conductive electrode Graphene Layer-by-layer (LbL) self-assembly Strain sensor Surface resistance fine control graphene Carbon Nanotubes BARRIER PROPERTIES economic indicators flexible displays Carbon Nanomaterials strain sensors thin film sensors functional composite material assemblies multilayers Composite films

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Fabrication and properties of HDPE/CF/CaCO3/PE-g-MAH quaternary composites

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IOP Conference Series: materials science and engineering 2015年第1期87卷

作者： X-L Wang H Ming H Yin College of Material Science and Engineering Chongqing University of Technology Chongqing 400054 China College of Mechanical and Electrical Engineering Yangtze Normal University Chongqing 408100 China

In this research, carbon fiber (CF) was taken as reinforcing filler, nano calcium carbonate (CaCO3) was taken as toughener, maleic anhydride grafted polyethylene (PE-g-MAH) was taken as compatibilizer for high density polyethylene (HDPE) modification. Through orthogonal test, the influence of different amount of ingredient CF, CaCO3 and PE-g-MAH on the mechanical properties of the HDPE composites was researched. The optimal composition of the quaternary composites with the good toughness and high strength was obtained.

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A large-scale and flexible BMS design

A large-scale and flexible BMS design

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作者： Zhang, Cheng Jun Zhang, Li Chao Shi, Yu Sheng School of Mechanical Engineering and Automation Wuhan Textile University Wuhan China State Key Laboratory of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038351399

Through comparing the battery management system (BMS) in existence, it concludes that every BMS has its own features, such as, interface, communication, data hand method, and so on. There is no uniform standard in the globe, so the BMS has the compatibility problems. In order to serve the problem, this paper proposed the large-scale and flexible BMS design, which can save the BMS design time and reduce the designer work strength. In this paper, the flexible hardware and software are designed, which can change the software and interface form a new BMS quickly to satisfy the market requirement. The large-scale and flexible BMS design method mentioned in this paper can accelerates the process of the BMS design, shortens the production development cycle, and satisfies the market requirement speedily. © (2014) Trans Tech Publications, Switzerland.

关键词： Battery management systems

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Bionics-housefly like inspiration 6

Bionics-housefly like inspiration

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6th International Conference on Nanomaterials, NANOCON 2014

作者： Luká, Voleský Jirí, Šafka Totka, Bakalová Technical University of Liberec Institute for Nanomaterials Advanced Technologies and Innovation Liberec Czech Republic Technical University of Liberec Faculty of Mechanical Engineering Department of Material Science Liberec Czech Republic

ISBN: (纸本)9788087294536

Bionics is a relatively young science, which was founded by the late 50's and 60's of the 19th Century. This branch of science is the study of natural organisms, materials and structures. These findings are trying to convert to technology. Life on earth has existed for more than 4 billion years. Throughout the organisms on the planet had to adapt to hostile conditions prevailing here. These adaptations brought most of the natural structures and materials to perfection. In this article it was studied a primitive animal, at first sight, that bother many people. The aim of the study is the housefly. How this little annoying insects could inspired us? Housefly is a very good flier, which can very well plough through the vertical smooth glass surface and has a very short reaction time on the stimulus. By scanning electron microscope, we entered into the secret of how to plough through the smooth vertical walls. We were inspired by the structure located at the end of feet of housefly. After a detailed study it was made a model of the feet of housefly in a macro scale. This model was subsequently tested for the functionality in a macro scale.

关键词： Scanning electron microscopy

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Design and testing of a low-cost and low-maintenance drip irrigation filtration system for micro-irrigation in developing countries

Design and testing of a low-cost and low-maintenance drip ir...

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ASME 2014 International Design engineering Technical Conferences and Computers and Information in engineering Conference, IDETC/CIE 2014

作者： Greenlee, Alison Murray, Timothy Lesniewski, Victor Jeunnette, Mark Winter, Amos G. V Department of Material Science and Engineering Photovoltaic Manufacturing Laboratory Massachusetts Institute of Technology CambridgeMA United States Department of Mechanical Engineering Sloan Automotive Lab Massachusetts Institute of Technology CambridgeMA United States Department of Mechanical Engineering Massachusetts Institute of Technology Comprehensive Initiative for Technology Evaluation CambridgeMA United States Department of Mechanical Engineering Hatsopoulos Microfuilidics Laboratory Massachusetts Institute of Technology CambridgeMA United States Global Engineering and Research Laboratory Department of Mechanical Engineering Massachusetts Institute of Technology CambridgeMA United States

ISBN: (纸本)9780791846353

关键词： Housing

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Cyclic strain resistance, stress response, fatigue life, and fracture behavior of high strength low alloy steel 300 M

Cyclic strain resistance, stress response, fatigue life, and...

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作者： Manigandan, K. Srivatsan, T.S. Tammana, Deepthi Poorgangi, Behrang Vasudevan, Vijay K. Department of Mechanical Engineering University of Akron Akron OH 44325-3903 United States School of Dynamic Systems Materials Science and Engineering Program University of Cincinnati Cincinnati OH 45221-0072 United States

The focus of this technical manuscript is a record of the specific role of microstructure and test specimen orientation on cyclic stress response, cyclic strain resistance, and cyclic stress versus strain response, deformation and fracture behavior of alloy steel 300 M. The cyclic strain amplitude-controlled fatigue properties of this ultra-high strength alloy steel revealed a linear trend for the variation of log elastic strain amplitude with log reversals-to-failure, and log plastic strain amplitude with log reversals-to-failure for both longitudinal and transverse orientations. Test specimens of the longitudinal orientation showed only a marginal improvement over the transverse orientation at equivalent values of plastic strain amplitude. Cyclic stress response revealed a combination of initial hardening for the first few cycles followed by gradual softening for a large portion of fatigue life before culminating in rapid softening prior to catastrophic failure by fracture. Fracture characteristics of test specimens of this alloy steel were different at both the macroscopic and fine microscopic levels over the entire range of cyclic strain amplitudes examined. Both macroscopic and fine microscopic observations revealed fracture to be a combination of both brittle and ductile mechanisms. The underlying mechanisms governing stress response, deformation characteristics, fatigue life, and final fracture behavior are presented and discussed in light of the competing and mutually interactive influences of test specimen orientation, intrinsic microstructural effects, deformation characteristics of the microstructural constituents, cyclic strain amplitude, and response stress. © 2014 ASM International.

关键词： Microstructure

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All-dielectric metasurfaces

All-dielectric metasurfaces

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Yuanmu Yang Parikshit Moitra Ivan. I. Kravchenko Daryl. P. Briggs Jason Valentine Interdisciplinary Materials Science Program Vanderbilt University Nashville Tennessee USA Oak Ridge National Laboratory Oak Ridge TN US Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge Tennessee USA Department of Mechanical Engineering Vanderbilt University Nashville Tennessee USA

In this talk, I will discuss our recent efforts to develop purely dielectric metamaterials possessing low absorption loss at optical frequencies. I will discuss implementations ranging from wavefront control to high Q... 详细信息

ISBN: (纸本)9781467371100

关键词： Optical resonators Dielectrics Optical variables control Absorption Optical losses Optical vortices Optical reflection

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Local stress evaluation during deformation in SUS304 austenitic stainless steel

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materials Today: Proceedings 2015年 2卷 S937-S940页

作者： Chen, M. Matsumoto, A. Shibata, A. Terada, D. Miyazawa, T. Sato, M. Adachi, H. Tsuji, N. Department of Materials Science and Engineering Kyoto University Yoshidahon-machi Sakyo-ku Kyoto 606-8501 Japan Elements Strategy Initiative for Structural Material Kyoto University Yoshida-honmachi Sakyo-ku Kyoto 606-8501 Japan Department of Mechanical Science and Engineering Chiba Institute of Technology 17-1 Tsudanuma 2-chome Narashino Chiba 275-0016 Japan Department of Metallurgy and Ceramics Science Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan 1-1-1 Kouto Sayo-cho Sayo-gun Hyogo 679-5198 Japan Department of Materials Science and Chemistry University of Hyogo Shosha 2167 Himeji 671-2280 Japan

In this study, the local stress in an SUS304 austenitic stainless steel was measured during tensile deformation by a technique called energy dispersive X-ray diffraction microscopy using synchrotron radiation X-ray diffraction in SPring-8. The local stress evolution of two positions in different grains, respectively, were shown in this paper. At one position, the tensile component of principal stress increased with increasing the tensile strain, but slightly deviated from the macroscopic tensile direction. On the other hand, at another position, the tensile component of principal stress was substantially different from the macroscopic tensile direction, and the drastic change in direction of local stress were observed due to martensitic transformation. © 2015 The Authors.

关键词： Deformation

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