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Communications in Theoretical Physics 2017年第4期67卷 449-457页

作者： Z.H.Khan m.Qasim Naeema Ishfaq W.A.Khan Department of mathematics University of MalakandChakdaraDir(Lower)Khyber PakhtunkhwaPakistan Department of mathematics COMSATS Institute of Information TechnologyPark RoadChak ShahzadIslamabadPakistan School of mathematical Sciences Peking UniversityBeijing 100871China Department of mechanical and Industrial Engineering College of Engineering Majmaah UniversityMajmaah 11952Kingdom of Saudi Arabia

We investigate the dual solutions for the mHD flow of micropolar fluid over a stretching/shrinking sheet with heat transfer. Suitable relations transform the partial differential equations into the ordinary differential *** forms solutions are also obtained in terms of confluent hypergeometric function. This is the first attempt to determine the exact solutions for the non-linear equations of mHD micropolar fluid model. It is demonstrated that the microrotation parameter helps in increasing Nusselt number and the dual solutions exist for all fluid flow parameters under consideration. The dual behavior of dimensionless velocity, temperature, microrotation, skin-friction coefficient,local Nusselt number is displayed on graphs and examined.

关键词： mHD micropolar fluid stretching/shrinking sheet exact and dual solutions

Induced modifications in the properties of Sr doped BiFeO3 multiferroics

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Progress in Natural Science:materials International 2013年第5期23卷 487-492页

作者： Tanvir Hussain Saadat A.Siddiqi Shahid Atiq m.S.Awan Centre of Excellence in Solid State Physics Quaid-e-Azam CampusUniversity of the Punjab Interdisciplinary Research Centre in Biomedical materials (IRCBm) COMSATS Institute of Information Technology Department of Physics COMSATS Institute of Information Technology

multiferroics exhibit unique combination of ferroic properties,*** instance,in BiFeO3,magnetic and electric properties *** this work,BiFeO3 and Sr-doped BiFeO3 samples with general formula,Bi1-x Srx FeO3(x=0.00,0.05,0.10,0.20,and 0.30) were synthesized by sol-gel auto-combustion technique,in order to investigate these ferroic *** samples were confrmed to have perovskite type rhombohedral structure,characteristic of BiFeO3.A dilute phase of Bi2Fe4O9was also found in all the Sr-doped *** micrographs of the palletized samples revealed that minutely doped Sr might not have any effect on the morphology of the *** dependent dielectric measurements were carried out at room temperature for all the samples from 100 Hz to 1 *** dielectric constant of un-doped sample at low frequency was 52 which decreased with increasing Sr *** enhancement of magnetic properties was observed with increasing the Sr *** BiFeO3 material was observed to have the least value of remanent *** the Sr2+ tions were doped in BiFeO3,its magnetization and remanence were increased to 0.867 emu/g and 0.175 emu/g,respectively,at x=0.30.

关键词： Bismuth ferrite Ferroelectricity Ferromagnetism Nanomaterials magnetically ordered materials

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μ和τ的辐射轻子衰变（英文）

中国科学技术大学学报 2016年第5期46卷 383-391 415,415页

作者： FAEL m. 伯尔尼大学理论物理学研究所爱因斯坦基础物理研究中心

τ的辐射轻子衰变的精确数据为探测τ的电磁性质提供了机会,而且可能允许确定其除了标准模型精确预言从来没有测量过的反常磁矩.最近,babar合作组测量了τ辐射轻子衰变的分支比(τ→lννγ,以l=e,μ).这些约3%的相对误差的精确测量必... 详细信息

τ的辐射轻子衰变的精确数据为探测τ的电磁性质提供了机会,而且可能允许确定其除了标准模型精确预言从来没有测量过的反常磁矩.最近,babar合作组测量了τ辐射轻子衰变的分支比(τ→lννγ,以l=e,μ).这些约3%的相对误差的精确测量必须在次领头阶上与QED预言的分支比一致.实际上,对l=e,辐射修正预计在10%量级,对于l=μ大约在3%.这里给出了μ和τ辐射轻子衰变微分衰变率和分支比的标准模型到次领头阶的预测,并与babar实验结果比较.此外,给出了在Belle和Belle II测量τ反常磁矩的可行性研究.

关键词：电弱辐射修正 μ衰变 τ衰变电磁矩

Exclusive semileptonic decays of D and Ds mesons in the covariant confining quark model

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Frontiers of physics 2019年第6期14卷 103-132页

作者： m.A.Ivanov J.G.Korner J.N.Pandya P.Santorelli N.R.Soni C.T.Tran Bogoliubov Laboratory of Theoretical Physics Joint Institute for Nuclear Research141980 DubnaRussia PRISmA Cluster of Excellence Institut für PhysikJohannes Gutenberg-UniversitatD-55099 MainzGermany Applied Physics Department Faculty of Technology and EngineeringThe Maharaja Sayajirao University of BarodaVadodara 390001GujaratIndia Dipartimento di Fisica"E.Pancini" Universitàdi Napoli FedericoⅡComplesso Universitario di Monte S.AngeloVia CintiaEdificio 680126 NapoliItaly Istituto Nazionale di Fisica Nucleare Sezione di Napoli80126 NapoliItaly

Recently,the BESⅢcollaboration has reported numerous measurements of various D(s)meson semileptonic decays with significantly improved *** with similar studies carried out at babar,Belle,and CLEO,new windows to a better understanding of weak and strong interactions in the charm sector have been *** light of new experimental data,we review the theoretical description and predictions for the semileptonic decays of D(s)to a pseudoscalar or a vector *** review is essentially an extended discussion of our recently published results obtained in the framework of the covariant confining quark model.

关键词： covariant quark model semileptonic decay charmed meson form factor angular distribution

mixed Convection Boundary Layer Flow over a Vertical Flat Plate with Radiative Heat Transfer

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Applied mathematics 2012年第7期3卷 705-716页

作者： Sadia Siddiqa m. A. Hossain Department of mathematics COMSATS Institute of Information Technology Park Road Chak Shahzad Islamabad Pakistan Former Professor of mathematics University of Dhaka Dhaka Bangladesh

In this article, the problem of mixed convection boundary layer flow of viscous fluid along a heated vertical plate is examined. In the analysis radiative component of heat flux emulates the surface temperature. Appropriate set of variables are embraced here which reduces the governing boundary layer equations into dimensionless form. Subsequently, a group of continuous transformation is applied on the dimensionless equations in order to obtain the parabolic partial differential equations for the regimes where modified Richardson number, Ri*, is 1) small i.e. when Ri* 1, 2) large i.e. when Ri* 1, and 3) covers all its values i.e. when 0 ≤ Ri* ≤ ∞. The system of equation for the corresponding regimes are thus integrated numerically via straightforward finite difference method along with Gaussian elimination technique. Its worth mentioning that results obtained here are valid particularly for the liquid metals for which Pr 1. moreover, the numerical results are demonstrated graphically by showing the effects of important physical parameters, namely, the modified Richardson number (or mixed convection parameter), Ri*, surface radiation parameter, R, and Prandtl number, Pr, in terms of local skin friction and local Nusselt number coefficients. In addition, comprehensive interpretation of thermal energy distributions is also given in terms of heatlines which is termed as good tool to visualize the flow patterns.

关键词： mixed Convection Thermal Radiation Liquid metals

The radiative decay D^(0)→ K^(*0)γ with vector meson dominance

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Chinese Physics C 2018年第4期42卷 135-141页

作者： J. m. Dias V. R. Debastiani Ju-Jun Xie E. Oset Institute of modern Physics Chinese Academy of Sciences Lanzhou 730000 China Departamento de Física Teórica and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Aptdo. 22085 46071 Valencia Spain Instituto de Física Universidade de S？o Paulo C. P. 66318 05389-970 S？o Paulo SP Brazil

motivated by the experimental measurements of D0 radiative decay modes, we have proposed a model to study the D0→ K＊0γ decay, by establishing a link with D0→ K＊0V （V=ρ0, ω） decays through the vector meson dominance hypothesis. In order to do this properly, we have used the Lagrangians from the local hidden gauge symmetry approach to account for Vγ conversion. As a result, we have found the branching ratio B[D0→ K＊0γ]=（1.55-3.44）×10-4, which is in fair agreement with the experimental values reported by the Belle and babar collaborations.

关键词： radiative decay vector meson dominance local hidden gauge symmetry

Feasibility and physics potential of detecting ^(8)B solar neutrinos at JUNO

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Chinese Physics C 2021年第2期45卷 93-110页

作者： Angel Abusleme Thomas Adam Shakeel Ahmad Sebastiano Aiello muhammad Akram Nawab Ali Fengpeng An Guangpeng An Qi An Giuseppe Andronico Nikolay Anfimov Vito Antonelli Tatiana Antoshkina Burin Asavapibhop João Pedro Athayde marcondes de André Didier Auguste Andrej Babic Wander Baldini Andrea Barresi Eric Baussan marco Bellato Antonio Bergnoli Enrico Bernieri David Biare Thilo Birkenfeld Sylvie Blin David Blum Simon Blyth Anastasia Bolshakova mathieu Bongrand Clément Bordereau Dominique Breton Augusto Brigatti Riccardo Brugnera Riccardo Bruno Antonio Budano max Buesken mario Buscemi Jose Busto Ilya Butorov Anatael Cabrera Hao Cai Xiao Cai Yanke Cai Zhiyan Cai Antonio Cammi Agustin Campeny Chuanya Cao Guofu Cao Jun Cao Rossella Caruso Cédric Cerna Jinfan Chang Yun Chang Pingping Chen Po-An Chen Shaomin Chen Shenjian Chen Xurong Chen Yi-Wen Chen Yixue Chen Yu Chen Zhang Chen Jie Cheng Yaping Cheng Alexander Chepurnov Davide Chiesa Pietro Chimenti Artem Chukanov Anna Chuvashova Gérard Claverie Catia Clementi Barbara Clerbaux Selma Conforti Di Lorenzo Daniele Corti Salvatore Costa Flavio Dal Corso Christophe De La Taille Jiawei Deng Zhi Deng Ziyan Deng Wilfried Depnering marco Diaz Xuefeng Ding Yayun Ding Bayu Dirgantara Sergey Dmitrievsky Tadeas Dohnal Georgy Donchenko Jianmeng Dong Damien Dornic Evgeny Doroshkevich marcos Dracos Frédéric Druillole Shuxian Du Stefano Dusini martin Dvorak Timo Enqvist Heike Enzmann Andrea Fabbri Lukas Fajt Donghua Fan Lei Fan Can Fang Jian Fang marco Fargetta Anna Fatkina Dmitry Fedoseev Vladko Fekete Li-Cheng Feng Qichun Feng Richard Ford Andrey Formozov Amélie Fournier Haonan Gan Feng Gao Alberto Garfagnini Alexandre Göttel Christoph Genster marco Giammarchi Agnese Giaz Nunzio Giudice Franco Giuliani maxim Gonchar Guanghua Gong Hui Gong Oleg Gorchakov Yuri Gornushkin marco Grassi Christian Grewing maxim Gromov Vasily Gromov minghao Gu Xiaofei Gu Yu Gu mengyun Guan Nunzio Guardone maria Gul Cong Guo Jingyuan Guo Wanlei Guo Xinheng Guo Yuhang Guo Paul Hackspacher Caren Hagner Ran Han Yan Yerevan Physics Institute YerevanArmenia UniversitéLibre de Bruxelles BrusselsBelgium Universidade Estadual de Londrina LondrinaBrazil Pontificia Universidade Catolica do Rio de Janeiro RioBrazil Pontificia Universidad Católica de Chile SantiagoChile Universidad Tecnica Federico Santa maria ValparaisoChile Beijing Institute of Spacecraft Environment Engineering BeijingChina Beijing Normal University BeijingChina China Institute of Atomic Energy BeijingChina Institute of High Energy Physics BeijingChina North China Electric Power University BeijingChina School of Physics Peking UniversityBeijingChina Tsinghua University BeijingChina University of Chinese Academy of Sciences BeijingChina Jilin University ChangchunChina College of Electronic Science and Engineering National University of Defense TechnologyChangshaChina Chongqing University ChongqingChina Dongguan University of Technology DongguanChina Jinan University GuangzhouChina Sun Yat-Sen University GuangzhouChina Harbin Institute of Technology HarbinChina University of Science and Technology of China HefeiChina The Radiochemistry and Nuclear Chemistry Group in University of South China HengyangChina Wuyi University JiangmenChina Shandong University JinanChina Institute of modern Physics Chinese Academy of SciencesLanzhouChina Nanjing University NanjingChina Guangxi University NanningChina East China University of Science and Technology ShanghaiChina School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuangChina Nankai University TianjinChina Wuhan University WuhanChina Xi’an Jiaotong University Xi’anChina Xiamen University XiamenChina School of Physics and microelectronics Zhengzhou UniversityZhengzhouChina Institute of Physics National Chiao-Tung University Hsinchu National United University Miao-Li Department of Physics National T

The Jiangmen Underground Neutrino Observatory(JUNO)features a 20 kt multi-purpose underground liquid scintillator sphere as its main *** of JUNO's features make it an excellent location for^8B solar neutrino measurements,such as its low-energy threshold,high energy resolution compared with water Cherenkov detectors,and much larger target mass compared with previous liquid scintillator *** this paper,we present a comprehensive assessment of JUNO's potential for detecting^8B solar neutrinos via the neutrino-electron elastic scattering process.A reduced 2 meV threshold for the recoil electron energy is found to be achievable,assuming that the intrinsic radioactive background^(238)U and^(232)Th in the liquid scintillator can be controlled to 10^(-17)g/*** ten years of data acquisition,approximately 60,000 signal and 30,000 background events are *** large sample will enable an examination of the distortion of the recoil electron spectrum that is dominated by the neutrino flavor transformation in the dense solar matter,which will shed new light on the inconsistency between the measured electron spectra and the predictions of the standard three-flavor neutrino oscillation *** m^(2)_(21)=4.8times10^(-5);(7.5times10^(-5))eV^(2),JUNO can provide evidence of neutrino oscillation in the Earth at approximately the 3sigma(2sigma)level by measuring the non-zero signal rate variation with respect to the solar zenith ***,JUNO can simultaneously measureDelta m^2_(21)using^8B solar neutrinos to a precision of 20% or better,depending on the central value,and to sub-percent precision using reactor antineutrinos.A comparison of these two measurements from the same detector will help understand the current mild inconsistency between the value of Delta m^2_(21)reported by solar neutrino experiments and the KamLAND experiment.

关键词： neutrino oscillation solar neutrino JUNO