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Epitaxial Growth Following Crystal Nucleation in Laser-Quenched Si Films on SiO2

MRS Online Proceedings Library 2015年第1期1770卷 67-72页

作者： Wong, Vernon K. Chitu, A. M. Limanov, A. B. Im, James S. Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York USA

We have investigated the solidified microstructure of nucleation-generated grains obtained via complete melting of Si films on SiO2 at high nucleation temperatures. This was achieved using a high-temperature-capable hot stage in conjunction with excimer laser irradiation. As predicted by the direct-growth model that considers (1) the evolution in the temperature of the solidifying interface and (2) the subsequent modes of growth (consisting of amorphous, defective, and epitaxial) as key factors, we were able to observe the appearance of “normal” grains that possess a single-crystal core area. These grains, which are in contrast to previously reported flower-shaped grains that fully make up the microstructure of the solidified films obtained via irradiation at lower preheating temperatures (and amongst which these “normal” grains emerge), indicate that epitaxial growth of nucleated crystals must have taken place within the grains. We discuss the implications of our findings regarding (1) the validity of the direct-growth model, (2) the nature of the heterogeneous nucleation mechanism, and (3) the alternative explanations and assumptions that have been previously employed in order to explain the microstructure of Si films obtained via nucleation and growth within the complete melting regime.

关键词： Si thin film nucleation & growth

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Long-range magnetic order in the Heisenberg pyrochlore antiferromagnets Gd2Ge2O7 and Gd2Pt2O7 synthesized under high pressure

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Physical Review B 2016年第21期94卷 214429-214429页

作者： X. Li Y. Q. Cai Q. Cui C. J. Lin Z. L. Dun K. Matsubayashi Y. Uwatoko Y. Sato T. Kawae S. J. Lv C. Q. Jin J.-S. Zhou J. B. Goodenough H. D. Zhou J.-G. Cheng Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Materials Science and Engineering Program University of Texas at Austin Austin Texas 78712 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Institute for Solid State Physics University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba 277-8581 Japan Department of Engineering Science University of Electro-Communications Chofu Tokyo 182-8585 Japan Department of Applied Quantum Physics Faculty of Engineering Kyushu University Fukuoka 819-0395 Japan College of Physics and Engineering Henan University of Science and Technology Luoyang 471003 China

Gd2Sn2O7 and Gd2Ti2O7 have been regarded as good experimental realizations of the classical Heisenberg pyrochlore antiferromagnet with dipolar interaction. The former was found to adopt the Palmer-Chalker state via a single, first-order transition at TN≈1K, while the latter enters a distinct, partially ordered state through two successive transitions at TN1≈1K and TN2=0.75K. To shed more light on their distinct magnetic ground states, we have synthesized two more gadolinium-based pyrochlore oxides, Gd2Ge2O7 and Gd2Pt2O7, under high-pressure conditions and performed detailed characterizations via x-ray powder diffraction, dc and ac magnetic susceptibility, and specific heat measurements down to 100 mK. We found that both compounds enter a long-range antiferromagnetically ordered state through a single, first-order transition at TN=1.4K for Gd2Ge2O7 and TN=1.56K for Gd2Pt2O7, with the specific heat anomaly similar to that of Gd2Sn2O7 rather than Gd2Ti2O7. Interestingly, the low-temperature magnetic specific heat values of both Gd2Ge2O7 and Gd2Pt2O7 were found to follow nicely the T3 dependence as expected for a three-dimensional antiferromagnet with gapless spin-wave excitations. We have rationalized the enhancement of TN in terms of the reduced Gd-Gd distances for the chemically pressurized Gd2Ge2O7 and the addition of extra superexchange pathways through the empty Pt−eg orbitals for Gd2Pt2O7. Our current study has expanded the family of gadolinium-based pyrochlores and permits us to achieve a better understanding of their distinct magnetic properties in a more comprehensive perspective.

关键词： Frustrated magnetism Pyrochlores AC susceptibility measurements DC susceptibility measurements Specific heat measurements

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Correction: High quality graphene films with a clean surface prepared by an UV/ozone assisted transfer process

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Journal of materials Chemistry C 2017年第15期5卷 3855-3855页

作者： Hongyan Sun Ding Chen Yuming Wu Qilong Yuan Liangchao Guo Dan Dai Kuan W. A. Chee Yang Xu Pei Zhao Nan Jiang Cheng-Te Lin College of Materials Science and Engineering Hunan University Changsha 410082 P. R. China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering (NIMTE) Chinese Academy of Sciences Ningbo 315201 China Department of Electrical and Electronic Engineering University of Nottingham Ningbo 315100 China Engineering and State Key Laboratory of Silicon Materials Zhejiang University Hangzhou Zhejiang China Institute of Applied Mechanics and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Hangzhou 310012 P. R. China

Correction for ‘High quality graphene films with a clean surface prepared by an UV/ozone assisted transfer process’ by Hongyan Sun et al., J. Mater. Chem. C, 2017, 5, 1880–1884.

Correction for ‘High quality graphene films with a clean surface prepared by an UV/ozone assisted transfer process’ by Hongyan Sun et al., J. Mater. Chem. C, 2017, 5, 1880–1884.

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Random close packing in protein cores

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Physical Review E 2016年第3期93卷 032415-032415页

作者： Jennifer C. Gaines W. Wendell Smith Lynne Regan Corey S. O'Hern Program in Computational Biology and Bioinformatics Yale University New Haven Connecticut 06520 USA Integrated Graduate Program in Physical and Engineering Biology (IGPPEB) Yale University New Haven Connecticut 06520 USA Department of Physics Yale University New Haven Connecticut 06520 USA Department of Molecular Biophysics & Biochemistry Yale University New Haven Connecticut 06520 USA Department of Chemistry Yale University New Haven Connecticut 06520 USA Department of Mechanical Engineering & Materials Science Yale University New Haven Connecticut 06520 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA

Shortly after the determination of the first protein x-ray crystal structures, researchers analyzed their cores and reported packing fractions ϕ≈0.75, a value that is similar to close packing of equal-sized spheres. A limitation of these analyses was the use of extended atom models, rather than the more physically accurate explicit hydrogen model. The validity of the explicit hydrogen model was proved in our previous studies by its ability to predict the side chain dihedral angle distributions observed in proteins. In contrast, the extended atom model is not able to recapitulate the side chain dihedral angle distributions, and gives rise to large atomic clashes at side chain dihedral angle combinations that are highly probable in protein crystal structures. Here, we employ the explicit hydrogen model to calculate the packing fraction of the cores of over 200 high-resolution protein structures. We find that these protein cores have ϕ≈0.56, which is similar to results obtained from simulations of random packings of individual amino acids. This result provides a deeper understanding of the physical basis of protein structure that will enable predictions of the effects of amino acid mutations to protein cores and interfaces of known structure.

关键词： Protein structure Proteins

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Organic Thin‐Film Transistors: UV–Ozone Interfacial Modification in Organic Transistors for High‐Sensitivity NO2Detection (Adv. Mater. 31/2017)

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Advanced materials 2017年第31期29卷

作者： Wei Huang Xinming Zhuang Ferdinand S. Melkonyan Binghao Wang Li Zeng Gang Wang Shijiao Han Michael J. Bedzyk Junsheng Yu Tobin J. Marks Antonio Facchetti State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China (UESTC) Chengdu 610054 China Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA Department of Materials Science and Engineering and Applied Physics Program Northwestern University 2220 Campus Drive Evanston IL 60208 USA Flexterra Inc. 8025 Lamon Avenue Skokie IL 60077 USA

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Magnetic Nanoparticles: High-Throughput, Protein-Targeted Biomolecular Detection Using Frequency-Domain Faraday Rotation Spectroscopy (Small 12/2017)

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Small 2017年第12期13卷

作者： Richard J. Murdock Shawn A. Putnam Soumen Das Ankur Gupta Elyse D. Z. Chase Sudipta Seal Health Sciences and Technology (HST) Institute for Medical Engineering and Science (IMES) Massachusetts Institute of Technology and Harvard University 77 Massachusetts Avenue 76-679 Cambridge MA 02139 USA Department of Mechanical and Aerospace Engineering University of Central Florida P.O. Box 162450 ENGR 1 Rm. 213 Orlando FL 32816 USA Department of Materials Science and Engineering Advanced Materials Processing and Analysis Center (AMPAC) Nanoscience Technology Center (NSTC) University of Central Florida P.O. Box 162455 ENGR 1 Rm. 207 Orlando FL 32816 USA Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania 229 Towne Building 220 South 33rd Street Philadelphia PA 19104 USA

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Simulation of LCF Characteristic of AA6063 Al Alloy Under Different Aging Conditions

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materials Today: Proceedings 2015年第4期2卷 2226-2235页

作者： S.K. Basantia Md Abu Bakkar N. Khutia D. Das Department of Aerospace Engineering and Applied Mechanics Indian Institute of Engineering Science and Technology Shibpur Howrah-711103 India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah-711103 India

Cyclic plastic deformation characteristics in the low cycle fatigue (LCF) regime of AA6063 Al-alloy subjected to three widely different aging conditions, namely: highly under aged (HUA), peak aged (PA) and highly over aged (HOA), have been simulated by finite element method considering Chaboche as well as Ohno-Wang phenomenological cyclic plasticity models. Results of LCF tests under the investigated strain ranges (0.4-1.0%) reveal that HUA state demonstrates significant cyclic hardening and better fatigue life compared to PA and HOA states. Simulation of stabilized hysteresis loops considering kinematic hardening formulation by Ohno-Wang model exhibits better correlation over Chaboche model.

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Deformation and failure behavior of nanowires and nanolattices

Deformation and failure behavior of nanowires and nanolattic...

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中国力学大会-2015

作者： Jafary-Zadeh Mehdi Wu Zhaoxuan Wong W.H. Zhang Yong-Wei Montemayor Lauren C. Gu X.Wendy Chen David Z. Greer Julia R. Lee Seok-Woo Srolovitz David J. Institute of High Performance Computing Division of Engineering and Applied Science California Institute of Technology1200 E California Blvd Department of Materials Science and Engineering Institute of Materials ScienceUniversity of Connecticut Departments of Materials Science & Engineering and Mechanical Engineering & Applied Mechanics University of Pennsylvania

We will then report our recent work on the effect of temperature and component size on the deformation and failure of nanolattices under compression using both nanomechanical testing and molecular dynamics ***,we disc...

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Publisher Correction: Alpha-synuclein facilitates to form short unconventional microtubules that have a unique function in the axonal transport

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Scientific reports 2018年第1期8卷 8019页

作者： Shiori Toba Mingyue Jin Masami Yamada Kanako Kumamoto Sakiko Matsumoto Takuo Yasunaga Yuko Fukunaga Atsuo Miyazawa Sakiko Fujita Kyoko Itoh Shinji Fushiki Hiroaki Kojima Hideki Wanibuchi Yoshiyuki Arai Takeharu Nagai Shinji Hirotsune Department of Genetic Disease Research Osaka City University Graduate School of Medicine Asahi-machi 1-4-3 Abeno Osaka 545-8585 Japan. Department of Bioscience and Bioinformatics Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka Fukuoka 820-850 Japan. JST-SENTAN 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan. JST-CREST 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan. Graduate School of Life Science University of Hyogo 3-2-1 Kouto Kamigori-cho Ako-gun Hyogo 678-1297 Japan. RSC-University of Hyogo Leading Program Center RIKEN SPring-8 Center 1-1-1 Kouto Sayo-cho Sayo-gun Hyogo 679-5148 Japan. Graduate School of Materials Science Nara Institute of Science and Technology 8916-5 Takayama Ikoma Nara 630-0101 Japan. Department of Pathology and Applied Neurobiology Kyoto Prefectural University of Medicine Graduate School of Medical Sciences Kajii-cho Kawaramachi-Hirokoji Kamigyo-ku Kyoto 602-8566 Japan. Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi-ku Kobe 651-2492 Japan. Department of Pathology Osaka City University Graduate School of Medicine Asahi-machi 1-4-3 Abeno Osaka 545-8586 Japan. Department of Biomolecular Science and Engineering Institute of Scientific and Industrial Research Osaka University Mihoga-oka 8-1 Osaka 567-0047 Japan. Department of Genetic Disease Research Osaka City University Graduate School of Medicine Asahi-machi 1-4-3 Abeno Osaka 545-8585 Japan. shinjih@med.osaka-cu.ac.jp.

A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.

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25th Annual Computational Neuroscience Meeting CNS-2016, Seogwipo City, South Korea, July 2-7, 2016 Abstracts

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BMC NEUROscience 2016年第1期17卷 1-112页

作者： [Anonymous] Computational Neurobiology Laboratory The Salk Institute for Biological Studies San Diego USA UNIC CNRS Gif sur Yvette France The European Institute for Theoretical Neuroscience (EITN) Paris France ATR Computational Neuroscience Laboratories Kyoto Japan Krembil Research Institute University Health Network Toronto Canada Department of Physiology University of Toronto Toronto Canada Department of Medicine (Neurology) University of Toronto Toronto Canada Department of Physics University of New Hampshire Durham USA Department of Neurophysiology Nencki Institute of Experimental Biology Warsaw Poland Department of Theory Wigner Research Centre for Physics of the Hungarian Academy of Sciences Budapest Hungary Department of Mathematical Sciences KAIST Daejoen Republic of Korea Department of Mathematics University of Houston Houston USA Department of Biochemistry & Cell Biology and Institute of Biosciences and Bioengineering Rice University Houston USA Department of Biology and Biochemistry University of Houston Houston USA Grupo de Neurocomputación Biológica Dpto. de Ingeniería Informática Escuela Politécnica Superior Universidad Autónoma de Madrid Madrid Spain Department of Biological Sciences University of Southern California Los Angeles USA Center for Neuroscience Korea Institute of Science and Technology Seoul South Korea Department of Neurology Albert Einstein College of Medicine Bronx USA Center for Neuroscience KIST Seoul South Korea Department of Neuroscience University of Science and Technology Daejon South Korea Systems Neuroscience Group QIMR Berghofer Medical Research Institute Herston Australia Department of Psychology Yonsei University Seoul South Korea Department of Psychiatry Kyung Hee University Hospital at Gangdong Seoul South Korea Department of Psychiatry Veterans Administration Boston Healthcare System and Harvard Medical School Brockton USA Department of Electrical and Electronic Engineering The University of Melbourne Parkvil

A1 Functional advantages of cell-type heterogeneity in neural circuits Tatyana O. Sharpee A2 Mesoscopic modeling of propagating waves in visual cortex Alain Destexhe A3 Dynamics and biomarkers of mental disorders Mitsuo Kawato F1 Precise recruitment of spiking output at theta frequencies requires dendritic h-channels in multi-compartment models of oriens-lacunosum/moleculare hippocampal interneurons Vladislav Sekulić, Frances K. Skinner F2 Kernel methods in reconstruction of current sources from extracellular potentials for single cells and the whole brains Daniel K. Wójcik, Chaitanya Chintaluri, Dorottya Cserpán, Zoltán Somogyvári F3 The synchronized periods depend on intracellular transcriptional repression mechanisms in circadian clocks. Jae Kyoung Kim, Zachary P. Kilpatrick, Matthew R. Bennett, Kresimir Josić O1 Assessing irregularity and coordination of spiking-bursting rhythms in central pattern generators Irene Elices, David Arroyo, Rafael Levi, Francisco B. Rodriguez, Pablo Varona O2 Regulation of top-down processing by cortically-projecting parvalbumin positive neurons in basal forebrain Eunjin Hwang, Bowon Kim, Hio-Been Han, Tae Kim, James T. McKenna, Ritchie E. Brown, Robert W. McCarley, Jee Hyun Choi O3 Modeling auditory stream segregation, build-up and bistability James Rankin, Pamela Osborn Popp, John Rinzel O4 Strong competition between tonotopic neural ensembles explains pitch-related dynamics of auditory cortex evoked fields Alejandro Tabas, André Rupp, Emili Balaguer-Ballester O5 A simple model of retinal response to multi-electrode stimulation Matias I. Maturana, David B. Grayden, Shaun L. Cloherty, Tatiana Kameneva, Michael R. Ibbotson, Hamish Meffin O6 Noise correlations in V4 area correlate with behavioral performance in visual discrimination task Veronika Koren, Timm Lochmann, Valentin Dragoi, Klaus Obermayer O7 Input-location dependent gain modulation in cerebellar nucleus neurons Maria Psarrou, Maria Schilstra, Neil Davey, Benjamin Torben-Ni

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