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Lithium‐Ion Batteries: Breathable Carbon‐Free Electrode: Black TiO2with Hierarchically Ordered Porous Structure for Stable Li–O2Battery (Adv. Energy Mater. 19/2017)

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Advanced Energy Materials 2017年第19期7卷

作者： Joonhyeon Kang Jinyoung Kim Sangheon Lee Sungun Wi Chunjoong Kim Seungmin Hyun Seunghoon Nam Yongjoon Park Byungwoo Park WCU Hybrid Materials Program Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Seoul 08826 Republic of Korea Department of Advanced Materials Engineering Kyonggi University Suwon Gyeonggi‐do 16227 South Korea Department of Materials Science and Engineering Chungnam National University Daejeon 34134 South Korea Department of Nano Mechanics Nano Mechanical Systems Research Division Korea Institute of Machinery and Materials (KIMM) Daejeon 34103 South Korea

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programmable Skins based on Core-Shell Microsphere/Nanotube/Polymer Composites

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MRS Online Proceedings Library 2015年第1期1800卷 1-6页

作者： Panchapakesan, Balaji Onal, Cagdas Loomis, James Small Systems Laboratory Department of Mechanical Engineering Worcester Polytechnic Institute Worcester USA Soft Robotics Laboratory Department of Mechanical Engineering Robotics Engineering Program Worcester Polytechnic Institute Worcester USA Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge USA

In this paper, we describe unique thermally responsive polymer system based on nanotube-elastomers dispersed with core-shell expanding microspheres (phase-change material). Upon thermal or infrared stimuli, liquid hydrocarbon cores encapsulated within the microspheres vaporize, expanding the surrounding shells and stretching the matrix. Microsphere transformation resulted in visible dimensional changes associated with macroscopic volume increase (>500%), reduction in density (>80%), and increase in elastic modulus (>675%). Additionally, electrically conductive nanotubes allowed for expansion dependent electrical responses. We present our new findings on expansion dependent superhydrophobicity in these materials and present some outlook and comparison of our stimuli responsive polymers with other material systems for future origami based applications.

关键词： actuator composite nanostructure

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Conformai mapping applied to the estimate of Surge and Swab geopressures

Conformai mapping applied to the estimate of Surge and Swab ...

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International Conference on Environment and Electrical engineering (EEEIC)

作者： Uyara F. Silva I. Q. Manoel Alan H. F. Silva Wesley P. Calixto Santiago Lemos Geovanne P. Furriel School of Electrical Mechanical and Computer Engineering Federal University of Goias (UFG) Goiania Brazil Experimental and Technological Research and Study Group (NExT) Federal Institute of Goias (IFG) Goiania Brazil Universidade Federal de Goias Goiania GO BR Program in Electronic Systems and Automation University of Brasilia (UnB) Brasilia Brazil Teaching and Research Center Applied to Education Federal University of Goias (UFG) Goiania Brazil

ISBN: (纸本)9781509023219

The purpose of this work is to calculate Surge and Swab pressure in oil wells with eccentricity between drill string and wellbore or casing string. Analysis of this phenomenon, in which the fluid is confined between two eccentric cylinders, are made. The conformal mapping is used to lead the eccentric domain into the concentric domain, since the usual models correspond to concentric geometries. The results of this study, using the proposed methodology, are presented and discussed.

关键词： Surges Geometry Stress Conformal mapping Mathematical model Indexes Liquids

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The palomar transient factory core-collapse supernova host-galaxy sample. I. Host-galaxy distribution functions and environment-dependence of CCSNe

arXiv

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arXiv 2020年

作者： Schulze, Steve Yaron, Ofer Sollerman, Jesper Leloudas, Giorgos Gal, Amit Wright, Angus H. Lunnan, Ragnhild Gal-Yam, Avishay Ofek, Eran O. Perley, Daniel A. Filippenko, Alexei V. Kasliwal, Mansi M. Kulkarni, Shri R. Nugent, Peter E. Quimby, Robert M. Sullivan, Mark Strothjohann, Nora Linn Arcavi, Iair Ben-Ami, Sagi Bianco, Federica Bloom, Joshua S. De, Kishalay Fraser, Morgan Fremling, Christoffer U. Horesh, Assaf Johansson, Joel Kelly, Patrick L. Knežević, Sladjana Maguire, Kate Nyholm, Anders Papadogiannakis, Seméli Petrushevska, Tanja Rubin, Adam Yan, Lin Yang, Yi Adams, Scott M. Bufano, Filomena Clubb, Kelsey I. Foley, Ryan J. Green, Yoav Harmanen, Jussi Ho, Anna Y.Q. Hook, Isobel M. Hosseinzadeh, Griffin Howell, D. Andrew Kong, Albert K.H. Kotak, Rubina Matheson, Thomas McCully, Curtis Milisavljevic, Dan Pan, Yen-Chen Poznanski, Dovi Shivvers, Isaac van Velzen, Sjoert Department of Particle Physics and Astrophysics Weizmann Institute of Science 234 Herzl St Rehovot76100 Israel Department of Astronomy Oskar Klein Centre Stockholm University AlbaNova Stockholm10691 Sweden DTU Space National Space Institute Technical University of Denmark Elektrovej 327 Kgs. LyngbyDK-2800 Denmark Department of Physics of Complex Systems Weizmann Institute of Science 234 Herzl St Rehovot76100 Israel Ruhr-Universität Bochum Astronomisches Institut German Centre for Cosmological Lensing Universitätsstr. 150 Bochum44801 Germany Astrophysics Research Institute Liverpool John Moores University 146 Brownlow Hill LiverpoolL3 5RF United Kingdom Department of Astronomy University of California BerkeleyCA94720-3411 United States Miller Senior Fellow Miller Institute for Basic Research in Science University of California BerkeleyCA94720 United States Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States Cahill Center for Astrophysics California Institute of Technology 1200 E. California Blvd PasadenaCA91125 United States Lawrence Berkeley National Laboratory 1 Cyclotron Road MS 50B-4206 BerkeleyCA94720 United States Department of Astronomy / Mount Laguna Observatory San Diego State University 5500 Campanile Drive San DiegoCA92812-1221 United States University of Tokyo Institutes for Advanced Study University of Tokyo KashiwaChiba277-8583 Japan School of Physics and Astronomy University of Southampton SouthamptonSO17 1BJ United Kingdom School of Physics and Astronomy Tel Aviv University Tel Aviv69978 Israel CIFAR Azrieli Global Scholars program CIFAR Toronto Canada Department of Physics and Astronomy University of Delaware NewarkDE19716 United States Joseph R. Biden Jr. School of Public Policy and Administration University of Delaware NewarkDE19716 United States Data Science Institute University of Delaware NewarkDE19716 United States Center for Urban

Several thousand core-collapse supernovae (CCSNe) of different flavors have been discovered so far. However, identifying their progenitors has remained an outstanding open question in astrophysics. Studies of SN host galaxies have proven to be powerful in providing constraints on the progenitor populations. In this paper, we present all CCSNe detected between 2009 and 2017 by the Palomar Transient Factory. This sample includes 888 SNe of 12 distinct classes out to redshift z ≈ 1. We present the photometric properties of their host galaxies from the far-ultraviolet to the mid-infrared and model the host-galaxy spectral energy distributions to derive physical properties. The galaxy mass functions of Type Ic, Ib, IIb, II, and IIn SNe ranges from 105 to 1011.5 M☉, probing the entire mass range of star-forming galaxies down to the least-massive star-forming galaxies known. Moreover, the galaxy mass distributions are consistent with models of star-formation-weighted mass functions. Regular CCSNe are hence direct tracers of star formation. Small but notable differences exist between some of the SN classes. Type Ib/c SNe prefer galaxies with slightly higher masses (i.e., higher metallicities) and star-formation rates than Type IIb and II SNe. These differences are less pronounced than previously thought. H-poor SLSNe and SNe Ic-BL are scarce in galaxies above 1010 M☉. Their progenitors require environments with metallicities of Copyright © 2020, The Authors. All rights reserved.

关键词： Galaxies

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Influence of zirconia shot peening treatment on high-cycle fatigue properties of Ti-6Al-4V

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Zairyo/Journal of the Society of Materials Science, Japan 2016年第9期65卷 679-686页

作者： Masaki, Kiyotaka Yonakuni, Yuki Hisamori, Noriyuki Suga, Yuichiro Kobayashi, Yuji Gowa, Daisuke Dept. of Mech. Eng. Systems Okinawa College National Institute of Technology Henoko Nago905-2192 Japan Nagaoka University of Technology Kamitomioka Nagaoka940-2188 Japan Dept. of Eng. and App. Sci. Sophia Univ. Chiyoda-ku Tokyo102-8554 Japan Master's Program in Science and Technology Mechanical Engineering. Sophia Univ. Chiyoda-ku Tokyo102-8554 Japan SINTOKOGIO Ltd Ohgi-cho Toyokawa441-1205 Japan

Rotating bending loading and axial loading fatigue tests were conducted to investigate the effect of zirconia shot peening on fatigue properties of Ti-6Al-4V ELI alloy. Specimen was treated in three different shot peening conditions. As a result of the rotating bending fatigue tests, the fatigue lives of shot peened specimen were longer life than non-peened specimen. Fish eyes were observed in the fracture surface of the most shot peened specimen. And there was the facet of α-Ti or the fine granular region near the crack initiation site of the fish eye. And then, fracture morphology of shot peened specimens is different by peening conditions. From the result of axial loading fatigue tests, it becomes obvious that the facet of α-Ti was formed by action of tensile stress over 500MPa without compressive stress and that the fine granular region was formed by action of compressive stress. These results suggested that low level tensile residual stress existed at subsurface near the surface of the SP treated specimen, and the residual stress distribution decided on internal crack origin type between the facet of α-Ti or the fine granular region. © 2016 The Society of Materials Science, Japan.

关键词： Aluminum alloys

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Acoustic Absorption Characteristics of Perforated Thin Plate with Air Jets and Cavity

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Open Journal of Fluid Dynamics 2015年第1期5卷 1-9页

作者： Hiromitsu Hamakawa Hiroki Matsuoka Taiki Yamai Kenta Asakura Toru Otsuru Reiji Tomiku Eru Kurihara Hidechito Hayashi Eiichi Nishida Department of Mechanical Engineering Oita University Oita Japan Graduate School Master’s Program of Engineering Oita University Oita Japan Torishima Pump Mfg. Co. Ltd Takatsuki-shi Osaka Japan Department of Architecture Oita University Oita Japan Department of Mechanical Engineering Nagasaki University Nagasaki Japan Department of Mechanical Systems Engineering Shonan Institute of Technology Fujisawa-shi Kanagawa Japan

The present paper focuses on the effect of air jets through a perforated thin plate on the characteristics of an acoustic absorption coefficient. We measured the flow rate, internal pressure, acoustic pressure, and transfer function by using an improved acoustic impedance tube. The normal incidence absorption coefficient was calculated from the measured transfer function using transfer function methods. As a result, the frequency characteristics of the acoustic absorption coefficient against the frequency showed a maximum value at the local frequency. The peak frequency of the acoustic absorption coefficient depended on the thickness of the background air space and the thickness of the perforated plate. As the flow rate increased through the micropores, the peak level of the acoustic absorption coefficient also increased until a flow rate of 80?l /min. As the flow rate further increased, the peak level of the acoustic absorption coefficient decreased and that of the high frequency band increased.

关键词： Acoustic Absorption Coefficient Perforated Plate Cavity Micropores Air Jets Acoustic Impedance Tube

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Wall to wall optimal transport 15

Wall to wall optimal transport

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15th European Turbulence Conference, ETC 2015

作者： Doering, Charles R. Souza, Andre N. Chini, Gregory P. Hassanzadeh, Pedram Department of Physics University of Michigan United States Department of Mathematics University of Michigan United States Center for the Study of Complex Systems University of Michigan United States Department of Mechanical Engineering Program in Integrated Applied Mathematics and Center for Fluid Physics University of New Hampshire United States Centre for the Environment Department of Earth and Planetary Sciences Harvard University United States

The calculus of variations is employed to find steady divergence-free velocity fields that maximize transport of a tracer between two parallel walls held at fixed concentration for one of two constraints on flow strength: a fixed value of the kinetic energy or a fixed value of the enstrophy (the mean square rate of strain in this situation). The optimizing flows realize upper limits on convective transport in this scenario. We interpret the results in the context of buoyancy-driven Rayleigh–Bénard convection problems that satisfy the flow intensity constraints, enabling us to investigate how optimal transport scalings compare with upper bounds on Nu expressed as a function of the Rayleigh number Ra. © TU Delft.

关键词： Kinetic energy

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Wave Energy Converters and Design Considerations for Gulf of Mexico

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Distributed Generation and Alternative Energy Journal 2015年第4期30卷 55-76页

作者： Guiberteau, Kelly Lee, Jim Liu, Yucheng Dou, Yangqing Kozman, Theodore A. Texas A and M University United States Mechanical Engineering and Program Coordinator of Systems Engineering University of Louisiana Lafayette United States ASME SAE ASEE United States Northwestern Polytechnical University United States University of Louisiana Lafayette Louisiana Industrial Assessment Center United States

This article presents an investigational study on wave energy converters (WECs) and the design considerations for possible implementation in the Gulf of Mexico (GOM). The types of WEC available from the market are studied first. The design considerations for implementing a WEC in GOM are then evaluated. There are several different types of devices that can be used in the system design. Each device type has different attributes that may be helpful or hurtful for the area and wave activity in the GOM. From the evaluation there is a recommendation of the optimal device design conditions, and three device types are recommended for further pursuit as design candidates. Six different WEC projects that are currently being developed and most are ready for commercial testing are examined. Our study evaluates the usefulness of the WECs for the GOM, and provides design factors of both physical and economic scaling. The result of this investigation reveals that while none of the devices can be installed "as is" in the GOM because of wave power or geometry requirements, there are some that have the potential to be modified and scaled down to fit the GOM climate.

关键词： Wave power

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Tissue engineering: Nano-Enabled Approaches for Stem Cell-Based Cardiac Tissue engineering(Adv. Healthcare Mater. 13/2016).

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Advanced healthcare materials 2016年第13期5卷

作者： Mahshid Kharaziha Adnan Memic Mohsen Akbari David A Brafman Mehdi Nikkhah Biomaterials Research Group Department of Materials Engineering Isfahan University of Technology Isfahan *** Iran. Center of Nanotechnology King Abdulaziz University Jeddah 21589 Saudi Arabia. Department of Mechanical Engineering University of Victoria Victoria BC Canada. School of Biological and Health Systems Engineering (SBHSE) Harington Bioengineering Program Arizona State University Tempe Arizona 85287 USA.

On page 1533 M. Nikkhah and co-workers review tissue engineering strategies in the treatment of cardiac diseases with emphasis on the use of nanoenabled approaches (e.g. nanoparticles, nanotopographies) in combination... 详细信息

关键词： biomaterials cardiac tissue engineering nanofeatured surfaces nanomaterials stem cells

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Investigating the effect of cryogenic pre-cooling on the friction stir processing of AZ31B

Investigating the effect of cryogenic pre-cooling on the fri...

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World Congress on engineering, WCE 2014

作者： Ammouri, Ali H. Kridli, Ghassan T. Ayoub, George Hamade, Ramsey F. Mechanical Engineering Department American University of Beirut 11-0236 Beirut Lebanon Department of Industrial and Manufacturing Systems Engineering University of Michigan Dearborn United States Mechanical Engineering Program Texas A and M University United States

ISBN: (纸本)9789881925350

This manuscript aims to investigate the effect of cryogenic in-process cooling via liquid nitrogen on the outcomes of the friction stir processing (FSP) of twin roll cast (TRC) magnesium alloy AZ31B. Friction stir processing was performed on 3mm thick sheets of TRC AZ31B at a wide range of processing parameters. The tool rotational speed was varied between 600 RPM and 2000 RPM while the tool feed rate varied between 75 mm/min and 900 mm/min. Thrust force and torque values were experimentally measured using a 4-component dynamometer. Temperature measurements were monitored during the different tests using Infrared sensors and thermocouples. The microstructure of processed samples was observed using optical microscopy. It was found that thrust force and torque values of the pre-cooled samples were 5% higher than those of the room temperature samples due to the material hardening induced by the cooling effect. Finer and more homogenous microstructure was observed for the pre-cooled samples when compared with samples processed at room temperature. The average grain size of pre-cooled samples was predicted using a relation -previously introduced by the authors- that relate grain size and the Zener-Hollomon parameter for TRC AZ31B. This equation was found to correctly predict grain diameter for in-line cooled FSP AZ31B samples at temperatures lower than room temperature.

关键词： Friction

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