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Assessment of Timoshenko Beam Models for Vibrational Behavior of Single-Walled Carbon Nanotubes using Molecular Dynamics

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Advances in Applied Mathematics and Mechanics 2009年第1期1卷 89-106页

作者： y.y.zhang C.M.Wang V.B.C.Tan Department of Mechanical Engineering National University of SingaporeKent RidgeSingapore 119260 Engineering Science Programme and Department of Civil Engineering National University of SingaporeKent RidgeSingapore 117574

In this paper,we study the flexural vibration behavior of single-walled carbon nanotubes(SWCNTs)for the assessment of Timoshenko beam ***tensive molecular dynamics(MD)simulations based on second-generation reactive empirical bond-order(REBO)potential and Timoshenko beam modeling are performed to determine the vibration frequencies for SWCNTs with various length-todiameter ratios,boundary conditions,chiral angles and initial *** effectiveness of the local and nonlocal Timoshenko beam models in the vibration analysis is assessed using the vibration frequencies of MD simulations as the *** is shown herein that the Timoshenko beam models with properly chosen parameters are applicable for the vibration analysis of *** simulation results show that the fundamental frequencies are independent of the chiral angles,but the chirality has an appreciable effect on higher vibration *** SWCNTs is very sensitive to the initial strain even if the strain is extremely small.

关键词： Vibration carbon nanotubes molecular dynamics Timoshenko beam models

Epitaxial growth and air-stability of monolayer Cu2Te

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Chinese Physics B 2020年第1期29卷 99-102页

作者： K Qian L Gao H Li S zhang J H yan C Liu J O Wang T Qian H Ding y y zhang X Lin S X Du H-J Gao Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

A new two-dimensional atomic crystal, monolayer cuprous telluride（Cu2Te） has been fabricated on a grapheneSi C（0001） substrate by molecular beam epitaxy（MBE）. The low-energy electron diffraction（LEED） characterization shows that the monolayer Cu2Te forms ■ superstructure with respect to the graphene substrate. The atomic structure of the monolayer Cu2Te is investigated through a combination of scanning tunneling microscopy（STM） experiments and density functional theory（DFT） calculations. The stoichiometry of the Cu2Te sample is verified by x-ray photoelectron spectroscopy（XPS） measurement. The angle-resolved photoemission spectroscopy（ARPES） data present the electronic band structure of the sample, which is in good agreement with the calculated results. Furthermore, air-exposure experiments reveal the chemical stability of the monolayer Cu2Te. The fabrication of this new 2D material with a particular structure may bring new physical properties for future applications.

关键词： cuprous telluride(Cu2Te) scanning tunneling microscopy(STM) density functional theory(DFT) chemical stability

Graphene Mesh on Molten Glass for Transparent Heating Devices

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Graphene Mesh on Molten Glass for Transparent Heating Device...

中国化学会第30届学术年会-第三十九分会：纳米碳材料

作者： Manish kr.Priydarshi y.y.zhang y.F.zhang Z.F.Liu Center for Nanochemistry (CNC) Beijing National Laboratory for Molecular SciencesState Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of Chemistry and Molecular EngineeringPeking University Department of Chemistry and Center for Nano and Micro Mechanics Tsinghua University Department of Materials Science and Engineering College of EngineeringPeking University

Graphene

关键词： Graphene glass Molten glass Graphene mesh Transparent heating device

Luminescence properties and energy transfer of Ce3+/Tb3+ co-doped Ca9La(PO4)5(SiO4)F2 phosphor

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Luminescence properties and energy transfer of Ce3+/Tb3+ co-...

第二届海峡两岸功能材料科技与产业峰会（2015）

作者： y.y.zhang L.F.Mei Z.H.Huang School of Materials Sciences and Technology China University of Geosciences

Emission-tunable phosphors CaLa(PO)(SiO)F:Ce,Tb with apatite structure were synthesized by a solid-state *** phase structure,photoluminescence(PL)properties,lifetimes and the PL thermal stability were investigated,***...

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Search for electron-antineutrinos associated with gravitational-wave events GW150914,GW151012,GW151226,GW170104,GW170608,GW170814,and GW170817 at Daya Bay

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Chinese Physics C 2021年第5期45卷 190-201页

作者： F.P.An A.B.Balantekin H.R.Band M.Bishai S.Blyth G.F.Cao J.Cao J.F.Chang y.Chang H.S.Chen S.M.Chen y.Chen y.X.Chen J.Cheng Z.K.Cheng J.J.Cherwinka M.C.Chu J.P.Cummings O.Dalager F.S.Deng y.y.Ding M.V.Diwan T.Dohnal J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong W.Q.Gu J.y.Guo L.Guo X.H.Guo y.H.Guo Z.Guo R.W.Hackenburg S.Hans M.He K.M.Heeger y.K.Heng A.Higuera y.K.Hor y.B.Hsiung B.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.Huang X.T.Huang y.B.Huang P.Huber D.E.Jaffe K.L.Jen X.L.Ji X.P.Ji R.A.Johnson D.Jones L.Kang S.H.Kettell S.Kohn M.Kramer T.J.Langford J.Lee J.H.C.Lee R.T.Lei R.Leitner J.K.C.Leung F.Li J.J.Li Q.J.Li S.Li S.C.Li W.D.Li X.N.Li X.Q.Li y.F.Li Z.B.Li H.Liang C.J.Lin G.L.Lin S.Lin J.J.Ling J.M.Link L.Littenberg B.R.Littlejohn J.C.Liu J.L.Liu C.Lu H.Q.Lu J.S.Lu K.B.Luk X.B.Ma X.y.Ma y.Q.Ma C.Marshall D.A.Martinez Caicedo K.T.MeDonald R.D.McKeown y.Meng J.Napolitano D.Naumov E.Naumova J.P.Ochoa-Ricoux A.OIshevskiy H.-R.Pan J.Park S.Patton J.C.Peng C.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren C.Morales Reveco R.Rosero B.Roskovec X.C.Ruan H.Steiner J.L.Sun T.Tmej K.Treskov W.-H.Tse C.E.Tull B.Viren V.Vorobel C.H.Wang J.Wang M.Wang N.y.Wang R.G.Wang W.Wang W.Wang X.Wang y.Wang y.F.Wang Z.Wang Z.Wang Z.M.Wang H.y.Wei L.H.Wei L.J.Wen K.Whisnant C.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing J.L.Xu T.Xu T.Xue C.G.yang L.yang y.Z.yang H.F.yao M.ye M.yeh B.L.young H.Z.yu Z.y.yu B.B.yue S.Zeng y.Zeng L.Zhan C.zhang F.y.zhang H.H.zhang J.W.zhang Q.M.zhang X.T.zhang y.M.zhang y.X.zhang y.y.zhang Z.J.zhang Z.P.zhang Z.y.zhang J.Zhao L.Zhou H.L.Zhuang J.H.Zou Instiute of Modern Physics East China University of Science and TechnologyShanghai 200237 University of Wisconsin MadisonWisconsin 53706 Wright Laboratory and Department of Physics Yale UniversityNew HavenConnecticut 06520 Brookhaven National Laboratory UptonNew York 11973 Department of Physics National Taiwan UniversityTaipei Institute of High Energy Physics Beijing 100049 National United University Miao-Li Department of Engineering Physics Tsinghua UniversityBejing 100084 Shenzhen University Shenzhen 518060 Sun yat-Sen(Zhongshan)University Guangzhou North China Electric Power University Bejjing 102206 Chinese University of Hong Kong Hong Kong 999077 Siena College LoudonvilleNew York 12211 Department of Physics and Astronomy University of CaliforniaIrvineCaliformia 92697 University of Science and Technology of China Hefei 230026 Charles University Faculty of Mathematics and PhysicsPrague Department of Physics University of llinois at Urbana-ChampaignUrbanaIlinois 61801 Lawrence Berkeley National Laboratory BerkeleyCalifornia 94720 Department of Physics Illinois Institute of TechnologyChicagoIllinois 60616 Joint Institute for Nuclear Research DubnaMoscow Region Beijing Normal University Beijing 100875 Department of Nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049 Department of Physics University of HoustonHoustonTexas 77204 China Institute of Atomic Energy Beijing 102413 Shandong University Jinan 250100 Guangxi University Nanning 530004 Center for Neutrino Physics Virginia TechBlacksburgVirginia 24061 Institute of Physics National Chiao-Tung UniversityHsinchu Department of Physics University of CincinnatiCincinnatiOhio 45221 Department of Physies Collge of Science and TechnologyTemple UniversityPhiladelphiaPennsylvania 19122 Dongguan University of Technology Dongguan 523808 Department of Physics University of CaliforniaBerkeleyCalifornia 94720 Department of Physics The University of Hong KongPokfulamHong Kong 999077 School

The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars *** the Daya Bay experiment,using the data collected from December 2011 to August 2017,a search was per-formed for electron-antineutrino signals that coincided with detected GW events,including GW150914,GW151012,GW151226,GW170104,GW170608,GW 170814,and GW *** used three time windows of±10,±500,and±1000 s relative to the occurrence of the GW events and a neutrino energy range of 1.8 to 100 MeV to search for correlated neutrino *** detected electron-antineutrino candidates were consistent with the expected background rates for all the three time *** monochromatic spectra,we found upper limits(90%confidence level)of the electron-antineutrino fluence of(1.13-2.44)×10^(11)cm^(-2)at 5 MeV to 8.0×10^(7)cm^(-2)at 100 MeV for the three time w *** the assumption of a Fermi-Dirac spectrum,the upper limits were found to be(5.4-7.0)×10^(9)cm^(2)for the three time windows.

关键词： grav itational waves electron-antineutrinos fluence upper limit

大型旋转机械摩擦学—动力学设计数据库的设计与实现

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润滑与密封 1998年第5期23卷 28-31页

作者：胡亚红刘路放谢友柏张优云西安交通大学润滑理论及轴承研究所 710049

本文针对摩擦学系统的特点,详细地研究了一类有代表性的摩擦学系统—大型汽轮发电机组转子轴承系统——的摩擦学—动力学设计数据库。说明了摩擦学—动力学设计数据库的设计过程,以及摩擦学—动力学设计数据库的结构和功能。

关键词：摩擦学摩擦学-动力学数据库旋转机械

Rapid Growth and Magnetic Properties of Fe7Co3 Intermetallic Compound

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Rapid Growth and Magnetic Properties of Fe7Co3 Intermetallic...

2012 International Conference on Mechanical Engineering and Materials(ICMEM 2012)

作者： y.y.zhang W.J.yao W.Sun J.y.Wang X.J.Han N.Wang Department of Applied Physics Northwestern Polytechnical University School of Materials Science Shanghai Jiaotong University

By drop tube and melt spinning techniques,rapid growth of Fe7Co3 intermetallic compound has been *** microstructures and nucleation characteristics under different cooling rates are *** the increase of cooling rate,Fe7Co3 intermetallic compound grains are refined in both rapid growth *** observation and theoretical analysis indicate that the nucleation rate in single-roller quenching is much greater than that in free-fall method when the cooling rate is under a same *** comparison of magnetic property between the alloy ribbons and other dimensional magnetic material were *** superior soft magnetic properties of Fe-Co alloy ribbons changes sensitively with the cooling rate,which is mainly decided by the wheel velocity.

关键词： Intermetallic Rapid solidification Microstructure Magnetic

Exercise preconditioning alleviates ischemia-induced memory deficits by increasing circulating adiponectin

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Neural Regeneration Research 2025年第5期20卷 1445-1454页

作者： Meifeng Zheng Borui zhang Sonata S y yau Kwok-Fai So Li zhang Haining Ou Department of Rehabilitation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key Laboratory of CNS Regeneration(Ministry of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabilitation Sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina State Key Laboratory of Brain and Cognitive Science Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercise and Brain Science School of PsychologyShanghai University of SportShanghaiChina Neuroscience and Neurorehabilitation Institute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral ischemia is a major health risk that requires preventive approaches in addition to drug *** exercise enhances neurogenesis and synaptogenesis,and has been widely used for functional rehabilitation after *** this study,we determined whether exercise training before disease onset can alleviate the severity of cerebral *** also examined the role of exercise-induced circulating factors in these *** mice were subjected to 14 days of treadmill exercise training before surgery for middle cerebral artery *** found that this exercise pre-conditioning strategy effectively attenuated brain infarct area,inhibited gliogenesis,protected synaptic proteins,and improved novel object and spatial memory *** analysis showed that circulating adiponectin plays a critical role in these preventive effects of *** activation of adiponectin receptors by Adipo Ron mimicked the effects of exercise,while inhibiting receptor activation abolished the exercise *** summary,our results suggest a crucial role of circulating adiponectin in the effects of exercise pre-conditioning in protecting against cerebral ischemia and supporting the health benefits of exercise.

关键词： adiponectin cerebral ischemia exercise pre-conditioning hippocampus memory function middle cerebral artery occlusion prefrontal cortex synaptic proteins treadmill exercise

Ga1-xMnxN Grown by Low Pressure Metalorganic Chemical Vapor Deposition and application in polarized LED

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Ga1-xMnxN Grown by Low Pressure Metalorganic Chemical Vapor ...

The Eighth Chinese Optoelectronics Symposium

作者： Z.T.Chen, y.y.Su, y.zhang, B.zhang, Z.J.yang, K.Xu, y.B.Pan, and G.y.zhang School of Physics, Research Center for Wide-band Semiconductors State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Peking University, Beijing 100871

Epitaxial ms of GalMnxN have been grown on c-sapphire substrates by low-pressure metal-organic vapour phase epitaxy. The samples show ferromagnetic behaviour up to a temperature of T = 380K with hysteresis curves showing a coercivity of 50-100 Oe. No ferromagnetic second phases and no significant deterioration in crystal quality with the incorporation of Mn can be detected by high-resolution x-ray diaction. The result of x-ray absorption near-edge structures indicates that Mn atoms substitute for Ga atoms. The Mn concentrations of the layers are determined to reach x = 0.038 by proton-induced x-ray emission. The structure of light emitting diode with polarization light emitting was discussed.

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