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本周物理学术讲座

文章发布时间:2016/1/19 12:58:26



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本周物理学术讲座

  1激光聚变点火的挑战与机遇

  报告人:刘杰,北京应用物理与计算数学研究所

  时间:2016.1.19(周二)14:30

  单位:中科院理论物理研究所

  地点:新楼六层报告厅

  聚变能源作为新型清洁无穷尽的能源解决方案,一直是人类不懈的追求目标。本报告介绍了聚变尤其是激光聚变的基本原理和主要涉及到的主要物理问题,并且介绍了激光聚变的国际研究的进展和动向,还介绍了激光聚变国内研究的进展,包括激光聚变国内研究的最新进展,对涉及到的主要物理问题进行了讨论,并对将来的激光聚变点火做了展望。

  2Molecular Beam Epitaxy growth of Semiconductor Nanostructures: present status and future prospects

  报告人:Mark Hopkinson,University of Sheffield

  时间:2016.1.19(周二)10:00

  单位:中科院半导体研究所

  地点:图书馆101会议室

  The talk will discuss the growth, structure and properties of self-assembled III-V semiconducting quantum dots produced by molecular beam epitaxy (MBE) growth. These quantum dot nanostructures of dimensions of in the 10nm range possess unique quantised electronic properties which can overcome some of the limitations of present-day optoelectronic devices, whilst offering new opportunities for quantum communications and computation. The talk will describe work performed on the synthesis of InGaAs quantum dots at Sheffield, including investigations of quantum dot structural properties, the electronic and optical properties of single quantum dots and quantum dot arrays and device applications in the fields of optical communications and sensing. Some of the limitations of present approaches and possible ways forward will be discussed. The talk will go on to examine future directions in MBE growth, including prospects for the integration with new materials, alternative nanostructures and methods to achieve higher degrees of ordering between individual nanostructures.

  3Dipole polarizability, parity violating asymmetry, and the neutron skin thickness

  报告人:Xavier Roca Maza,University of Milan, Italy

  时间:2016.1.20(周三)10:00

  单位:中科院理论物理研究所

  地点:理论物理所322报告厅

  In low-energy nuclear physics, effective interactions have been successfully implemented at the mean-field level for the deion of average nuclear properties such as masses, radii, deformations or giant resonances of nuclei. In this talk I will present the theoretical analysis of two isovector sensitive observables that are currently accessible in laboratories: the parity violating asymmetry and the dipole polarizability. We present the study of some selected nuclei that have been or are planned to be measured in the near future. Specifically, we will show that the neutron skin thickness impacts in a relatively simple and clear way on the value of the parity violating asymmetry and the electric dipole polarizability. Our results indicate that future measurements on different systems in the region of medium-heavy to heavy nuclei may pave the way to a better understanding of some basic features of the equation of state of neutron-rich matter and will impact on our theoretical picture of exotic nuclei, which are investigated in Rare Ion Beam Facilities worldwide.

  4中微子混合与离散味对称性

  报告人:赵振华,中科院高能物理研究所

  时间:2016.1.20(周三)10:00

  单位:中科院高能物理研究所

  地点:理论室 319

  5Where does the proton mass come from?

  报告人:杨一玻,University of Kentucky

  时间:2016.1.20(周三)15:00

  单位:中科院高能物理研究所

  地点:Theoretical Physics Division,319

  The speaker will introduce the progress on the proton mass decomposition, based on Ji’s scheme and the direct lattice QCD calculation. Ji’s scheme provides a picture to decompose the proton mass into the quark mass which is directly related to the coupling to Higgs boson, the quark energy comes from the motion of the quark, and also the glue part comes from the non-trivial vacuum structure, while the phenomenology inputs are required. The lattice QCD calculation provides a systematic way to determine these inputs from the first-principles theory, and can provide a reliable proton mass decomposition without the phenomenology module dependence.

  6Algebraization and exact solution of a master Hamiltonian of spins and bosons

  报告人:Yao-Zhong Zhang,The University of Queensland

  时间:2016.1.20(周三)15:00

  单位:中科院理论物理研究所

  地点:理论物理所322报告厅

  We introduce novel polynomial deformations of the 3-dimensional $A_1$ algebra, which give rise to an algebraization of a very general Hamiltonian of interest in atomic, molecular, nuclear and optical physics. We construct the unitary representations and the corresponding differential operator realizations of the polynomial algebras. This enables us to transform the Hamiltonian into a higher order differential operator which is quasi-exactly solvable. We solve the Hamiltonian differential equation by the functional Bethe ansatz, thus obtaining the exact solutions of the general Hamiltonian. This includes as special cases solutions of many interesting models such as the Bose-Einstein condensate models, the Lipkin-Meshkov-Glick model and the Tavis-Cummings model.

  7HI in a Multi-wavelength Dissertation of Galaxies

  报告人:Jing Wang,Australia Telescope National Facility

  时间:2016.1.21(周四)14:00

  单位:清华大学天体物理中心

  地点:物理系报告厅B406

  Galaxies are ecosystems of gas and stars, and we should ask about their connection in studying every aspect of galaxy evolution. While the development of HI (the atomic gas) science for galaxies is relatively lagged compared to other bands, we are in front of a golden age for it. I will present a series of my studies on cold gas accretion, star formation, star formation quenching and structure (morphology) evolution in galaxies based on a multi-wavelength and HI-involved observational method. I will also show the current limitations that can be overcome with the new radio facilities including the FAST telescope in the near future.

  8The role of climate variability and emissions on ozone pollution means and extremes

  报告人:Meiyun Lin, GFDL

  时间:2016.1.22(周五)10:00

  单位:北京大学物理学院

  地点:物理楼北547

  Understanding the factors controlling year-to-year variability and long-term changes of regional air quality and extremes is crucial to developing forecasting capabilities and designing effective control measures. Meteorological conditions and extreme weather events can play an essential role in the deterioration of regional air quality. Using western North America as an example, I will present how climate variability modulates near-surface ozone means and extremes via large-scale pollution transport and intrusions of stratospheric ozone deep into the troposphere . The presence of internal climate variability can pose a challenge to the detection of ozone trends from short (and sparse) observational records and the attribution of these changes to anthropogenic emission trends . I will also discuss the implications of these results for understanding air quality in China.

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