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Author Correction: Proton acceleration in thermonuclear nova explosions revealed by gamma rays

Nature Astronomy 2022年 760页

作者： V. A. Acciari J. Becerra González E. Colombo R. J. García López J. Herrera A. López-Oramas C. Maggio V. Moreno M. Nievas Rosillo J. Otero-Santos G. Vanzo M. Vazquez Acosta S. Ansoldi B. De Lotto A. Donini F. Longo D. Miceli M. Palatiello M. Persic L. A. Antonelli C. Bigongiari S. Covino V. D’Elia F. Dazzi A. Lamastra F. Leone S. Lombardi L. Maraschi L. Nava S. Paiano C. Righi F. G. Saturni A. Stamerra F. Tavecchio A. Tutone A. Biland S. Fukami M. Artero O. Blanch S. M. Colak M. Delfino J. Delgado E. Do Souto Espiñeira L. Fariña Alonso L. Jouvin D. Kerszberg M. Martínez A. Moralejo E. Moretti C. Nigro C. Priyadarshi J. Rico K. Asano D. Hadasch M. Hütten T. Inada Y. Iwamura Y. Kobayashi D. Mazin K. Noda Y. Ohtani T. Saito S. Sakurai J. Sitarek M. Strzys M. Takahashi R. Takeishi M. Teshima I. Vovk D. Baack H. Bökenkamp D. Elsaesser A. Fattorini L. Linhoff S. Mender W. Rhode K. Schmidt A. Babić Ž. Bošnjak S. Cikota A. Baquero J. A. Barrio J. L. Contreras M. V. Fonseca J. Hoang M. López-Moya A. Mas Aguilar T. Miener D. Morcuende P. Peñil U. Barres de Almeida B. Machado de Oliveira Fraga I. Batković M. Bernardos G. Busetto A. De Angelis M. Doro R. López-Coto M. Mallamaci M. Mariotti E. Prandini A. Spolon W. Bednarek P. Gliwny K. Ishio D. Sobczynska L. Bellizzi S. Menchiari J. M. Miranda R. Paoletti S. Truzzi S. Ventura C. Wunderlich E. Bernardini W. Bhattacharyya M. Garczarczyk K. Satalecka A. Arbet Engels A. Berti J. Besenrieder G. Ceribella Y. Chai G. D’Amico C. Fruck J. G. Green D. Green A. Hahn L. Heckmann R. Mirzoyan D. Paneque M. Pihet T. Schweizer D. Strom J. van Scherpenberg M. Will G. Bonnoli R. Carosi P. Da Vela P. G. Prada Moroni A. Rugliancich M. Cerruti E. Molina J. M. Paredes M. Ribó A. Chilingarian J. Cortina C. Delgado Mendez T. Hassan I. Jiménez Martínez A. Del Popolo D. Depaoli F. Di Pierro C. F. Vigorito L. Di Venere N. Giglietto F. Giordano S. Loporchio D. Dominis Prester M. Manganaro S. Mićanović L. Pavletić T. Terzić D. Dorner K. Mannheim B. Schleicher V. Fallah Ramazani J. Jormanainen E. Lindfors Instituto de Astrofísica de Canarias and Dpto. de Astrofísica Universidad de La Laguna La Laguna Tenerife Spain Departament de Física and CERES-IEEC Universitat Autònoma de Barcelona Bellaterra Spain Università di Udine and INFN Trieste Udine Italy International Center for Relativistic Astrophysics (ICRA) Rome Italy Dipartimento di Fisica Università di Trieste Trieste Italy Laboratoire d’Annecy de Physique des Particules (LAPP) CNRS-IN2P3 Annecy Cedex France INAF Trieste and Dept. of Physics and Astronomy University of Bologna Bologna Italy National Institute for Astrophysics (INAF) Rome Italy ETH Zürich Zürich Switzerland Institut de Física d’Altes Energies (IFAE) The Barcelona Institute of Science and Technology (BIST) Bellaterra Barcelona Spain Port d’Informació Científica (PIC) Bellaterra Barcelona Spain Japanese MAGIC Group: Institute for Cosmic Ray Research (ICRR) The University of Tokyo Kashiwa Chiba Japan Max-Planck-Institut für Physik München Germany Technische Universität Dortmund Dortmund Germany Croatian MAGIC Group: University of Zagreb Faculty of Electrical Engineering and Computing (FER) Zagreb Croatia IPARCOS Institute and EMFTEL Department Universidad Complutense de Madrid Madrid Spain Department of Astronomy University of California Berkeley Berkeley CA USA Centro Brasileiro de Pesquisas Físicas (CBPF) Rio de Janeiro RJ Brazil Università di Padova and INFN Padova Italy University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz Poland Università di Siena and INFN Pisa Siena Italy Deutsches Elektronen-Synchrotron (DESY) Zeuthen Germany Department for Physics and Technology University of Bergen Bergen Norway Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada Spain Università di Pisa and INFN Pisa Pisa Italy University of Innsbruck Innsbruck Austria Universitat de Barcelona ICCUB IEEC-UB Barcelona Spain Armenian MAGIC Group: A. Alikhanyan National Science Labo

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Strengthening mechanism and yield strength prediction of cold-drawn commercially pure aluminum wire

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IOP Conference Series: materials science and engineering 2018年第2期382卷

作者： Rui Li Jiapeng Hou Wenhao Yang Hongyun Yu Qiang Wang Zhefeng Zhang National Quality Supervision & Inspection Center of Electrical Equipment Safety Performance Zhejiang Huadian Equipment Testing Institute Hangzhou 310015 PR China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 PR China. Dept. of Mechanical Engineering Tsinghua University Beijing 100000 PR China.

Commercially pure aluminum is a widely used conductive material in the field of overhead transmission. Yield strength, which is closely related to the reliability of conductive material in service, is an important parameter of mechanical property. Aluminum wire, which is widely used as the outer layer of steel core aluminum strand, is usually prepared by cold-drawing process. With the increase of area reduction, the strength of aluminum wire increases continuously and thus yield strength prediction becomes a very important scientific issue based on the strengthening mechanism analysis. In this paper, the contributions of grain refinement and hard texture to the yield strength were calculated by characterizing the microstructure of aluminum wire with different area reductions. Subsequently, the yield strength prediction model was set up by means of the quantitative calculation and function fitting of grain refinement strengthening and texture strengthening. By using this model, the yield strength of aluminum wire can be well predicted based on the average grain size of initial aluminum rod and this model can also guide the design and production of aluminum wire in industry field.

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Deformation of antirust aluminium battery shell during drawing

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Academic Journal of Manufacturing engineering 2016年第1期14卷 22-27页

作者： Li, Yong Zhang, Yuxin Deng, Guannan Ding, Yaping Zhang, Ruizhu Dept. of Mechanical Engineering North China University of Water Resources and Electric Power Zhengzhou China School of Materials Science and Engineer Shanghai University Shanghai200444 China

Drawing deeply is an important sheet metal forming process in many industrial fields. For the purpose of optimize the design of drawing dies for the battery shell, the work carried on the simulation to forming process of the battery shell with finite-element software ***, has studied the ironing drawing forming and influence of the main parameters to the forces, and avoided the slight tension fracture flaw, furthermore, made up the insufficiency of drawing die empirical design. The unit drawing strength is stable when friction coefficient f=0.80, which verified the instruction function of numerical simulation results in the multi-pass drawing and the technological design. The experimental results showed that the sidewall corner base and the punch-nose angle contacting place material are thick smallest to the strain algebraic value. Additionally, wall thickness attenuation quantity is biggest, and the drawing base semi-finished materials thin are more serious, the present examine implied that the proposed approach is a valuable.

关键词： Finite element method

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Refinement of primary Si grains of A390 alloy slurry through serpentine channel pouring process

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China Foundry 2015年第6期12卷 431-439页

作者： Zhi-kai Zheng Wei-min Mao Bing-quan Yan Rui Yue Zhi-yong Liu School of Materials Science and Engineering University of Science and Technology Beijing Cixi Huili Machinery & Electric Co. Ltd. Dept. of Mechanical Engineering Tsinghua University

In this paper, the serpentine channel pouring process for preparing a semi-solid A390 alloy slurry and refining the primary Si grains of the A390 alloy, was used. The effects of the pouring temperature, the cooling water flow and the number of the curves on the size of the primary Si grains in the semi-solid A390 alloy slurry were investigated. The results show that the pouring temperature, the cooling water flow and the number of the curves have a major effect on the size and the distribution of primary Si grains. Under the experimental condition of the four-curve copper channel whose cooling water flow was 500 L·h-1 and the pouring temperature was 690 oC, the primary Si grains of the semi-solid A390 alloy slurry were refined to the greatest extent and the lath-like grains were changed into granular ones. Additionally, the equivalent grain diameter and the average shape factor of the primary Si grains of the satisfactory semi-solid A390 alloy slurry are 18.6 μm and 0.8, respectively. Further, the refinement mechanism of the primary Si grains through the serpentine channel pouring process was analyzed and discussed. In summary, the primary Si nuclei could be easily precipitated due to the chilling effect of the channel inner wall, thus the primary Si grains were greatly refined. Meanwhile, the subsequent alloy melt fluid also promoted the separation of primary Si grains from the inner wall, further refining the primary Si grains.

关键词： hypereutectic Al-Si alloy serpentine pouring channel process semi-solid process A390 alloy primary Si

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First-principles understanding of the electronic band structure of copper-antimony halide perovskite: The effect of magnetic ordering

arXiv

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arXiv 2017年

作者： Wang, Xiaoming Meng, Weiwei Xiao, Zewen Wang, Jianbo Mitzi, David Yan, Yanfa Dept. of Physics and Astronomy and Wright Center for Photovoltaic Innovation and Commercialization University of Toledo ToledoOH43606 United States School of Physics and Technology Center for Electron Microscopy Moe Key Laboratory of Artificial Micro- and Nano-structures Institute for Advanced Studies Wuhan University Wuhan430072 Materials Research Center for Element Strategy Tokyo Institute of Technology Yokohama226-8503 Japan Department of Mechanical Engineering and Materials Science Duke University Box 90300 Hudson Hall DurhamNC27708-0300

We report the understanding of the electronic band structure of Cs4CuSb2Cl12perovskite through first-principles density-functional theory calculations. We find that the most stable state has the antiferromagnetic configuration where each [CuCl6] octahedral chain along the [010] direction is antiferromagnetic. The reasonable band structure of the compound can be obtained only if both the correct magnetic order and the improved exchange interaction of the Cu d electrons are taken into account. Copyright © 2017, The Authors. All rights reserved.

关键词： Antiferromagnetism

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Constitutive modelling of elastomer/graphene platelet nanocomposites

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IOP Conference Series: materials science and engineering 2017年第1期244卷

作者： Amir A. Abdelsalam Sherif Araby M. A. Hassan A. A. El-Moneim Materials Science and Engineering Department Egypt-Japan University of Science and Technology Alexandria Egypt Department of Mechanical Engineering Faculty of Engineering Benha University Egypt School of Engineering University of South Australia SA 5095 Australia Mechanical Engineering Department Faculty of Engineering Assiut University Assiut 71516 Egypt Physical Chemistry Dept. National Research Center El-Dokki-Giza Egypt

Elastomers are used in a wide variety of structural and engineering applications. They exhibit a nonlinear elastic stress-strain behaviour known as hyperelasticity which is generally described by hyperelastic strain energy functions. The question raised in the current study was; which model can accurately describe and predict the actual behaviour of the elastomer nanocomposites. The tensile data were used to fit the various elastomeric material models available in *** finite element analysis package. The relative percentage error was calculated to determine the goodness of fit in order to select the best model. Numerical results showed that the third order deformation model was the best among the various material models since giving a maximum relative error of fit was 2.7% at small and large strains. To verify the effectiveness of third order deformation model, FE simulations for tensile test was carried out. The results showed that the third order model is sufficiently enough to regenerate the experimental data for uniaxial test and efficiently capture the hyperelastic behavior as good as the experiments.

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Analysis of Power Generating Speed Bumps Made of Concrete Foam Composite

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IOP Conference Series: materials science and engineering 2017年第1期180卷

作者： B Syam M Muttaqin D Hastrino A Sebayang W S Basuki M Sabri S Abda Impact and Fracture Research Center Dept. of Mechanical Engineering Faculty of Engineering University of Sumatera Utara (USU Graduate Student MechEngr Study Program USU Undergraduate Student Dept of MechEngr Study USU Dept. of Chemistry Faculty of Science University of Sumatera Utara Graduate student Dept. of Mech. Engr Faculty of Engineering University of Sumatera Utara

This paper discusses the analysis of speed bump made of concrete foam composite which is used to generate electrical power. Speed bumps are designed to decelerate the speed of vehicles before passing through toll gates, public areas, or any other safety purposes. In Indonesia a speed bump should be designed in the accordance with KM Menhub 3 year 1994. In this research, the speed bump was manufactured with dimensions and geometry comply to the regulation mentioned above. Concrete foam composite speed bumps were used due to its light weight and relatively strong to receive vertical forces from the tyres of vehicles passing over the bumps. The reinforcement materials are processed from empty fruit bunch of oil palm. The materials were subjected to various tests to obtain its physical and mechanical properties. To analyze the structure stability of the speed bumps some models were analyzed using a FEM-based numerical softwares. It was obtained that the speed bumps coupled with polymeric composite bar (3 inches in diameter) are significantly reduce the radial stresses. In addition, the speed bumps equipped with polymeric composite casing or steel casing are also suitable for use as part of system components in producing electrical energy.

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mechanical Response of Open Channel Cover Made of Concrete Foam Due to External Loadings

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Journal of Physics: Conference Series 2017年第1期801卷

作者： Bustami Syam Alexander Sebayang Indra Gunawan Maraghi Muttaqin Herry Darmadi WS Basuki M. Sabri S. Abda Impact and Fracture Research Center Dept. of Mechanical Engineering Faculty of Engineering University of Sumatera Utara (USU Graduate Student MechEngr Study Program USU Undergraduate Student Dept of MechEngr Study USU Dept. of Chemistry Faculty of Science University of Sumatera Utara Graduate student Dept. of Mech. Engr Faculty of Engineering University of Sumatera Utara

Open channel conduit is commonly constructed on side roadway, car park area, etc., with the aims to collect rainwater or seapage water. To avoid garbages following the waterflow, the conduit is equipped with adequate cover. In addition, the cover can also be functioned for temporary car park area. Thus, the conduit cover should strong enough to sustain external loading. This paper discusses the design and response of the conduit cover using finite element software ANSYS mechanical version 17.5.

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Special section: Energy - Solid oxide fuel cells and membranes

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Chemical engineering Progress 2016年第7期112卷

作者： Brinkman, Kyle Huang, Kevin Dept. of Materials Science and Engineering Clemson Univ since 2014 161 Sirrine Hall ClemsonSC29634 United States Mechanical Engineering Department SmartState Center for Solid Oxide Fuel Cells University of South Carolina United States

Fuel cells and membranes are similar in that they employ materials that transport ions and electrons. Both can play important roles in making clean energy a reality. A solid oxide fuel cell (SOFC) directly converts the chemical energy in fossil fuels into electrical power via an electrochemical reaction. A SOFC has three basic functional elements, cathode, electrolyte, and anode. Like the components of a battery, each SOFC component exhibits an internal resistance to either electronic or ionic current flow, often expressed as voltage loss. The terminal cell voltage is, therefore, the open circuit voltage reduced by the individual voltage loss of each cell component. To increase the reliability and reduce the cost of SOFCs, designers strive to obtain high performance at low operating temperatures. To achieve this goal, modern SOFCs typically contain a thin electrolyte film supported on a substrate a porous or channeled dense layer that enables gas transport. The porous electrode (cathode or anode), dense metal or ceramic interconnect, or porous inactive insulator can serve as the substrate.

关键词： Solid oxide fuel cells (SOFC)

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Removal of Mn ions from polluted water using dealuminated kaolinite

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Journal of engineering and Applied science 2016年第3期63卷 221-236页

作者： Anwar, A. El-Mid Any, A.A. Hassan, M. El-Shall, H. Elwageeh, M. Cairo Water Company Egypt Mining Engineering Program Mining Petroleum and Metallurgy Dept. Faculty of Engineering Cairo University Egypt Ore Evaluation Lab. Minerals Technology Department Central Metallurgical R and D Institute Egypt Emeritus of Materials Science and Engineering University of Florida United States Faculty of Engineering Cairo University Egypt

Manganese is one of the pollutants that affect the human health when exceeds the permissible limit. Due to the toxic and hazardous nature of Mn, it is possibly the most widespread groundwater contaminant, imposing a serious threat to human health. There are several efforts to remove manganese from water by adsorption process. The goal of this study is to find a cost effective adsorbent. In this regard, dealuminated kaolinite may be used as adsorbent due to its activation by thermal and chemical treatment during Al removal process. In addition absence of Al atoms may provide excess active energy for adsorption of cations such as Mn. The results indicated that the longer adsorption time gives more chance for Mn ions to adsorb on kaolinite leading to highest efficiency of Mn removal (about 64.5%) at low pH and extraction time of 5 hours. At higher pH =9, Mn removal efficiency increased but at lower level than that at the acidic pH range. Finally a suitable effect results based on the bases of ionic species of Mn as a function of pH indicating the possibility of precipitation of Mn as manganese carbonates. © 2016 Cairo University. All rights reserved.

关键词： Kaolinite

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