真空知识、真空泵和磁悬浮技术||本周物理学术讲座

1真空知识及各种真空泵的工作原理及使用

报告人：楚双建，北京中科科仪

时间：9月7日（周四）9:00

单位：中科院物理研究所

地点：M楼253室

自从上个世纪六十年代以来，“真空获得技术”几经发展，但分子泵的地位一直未曾被撼动，至今分子泵在真空获得技术中扮演的重要角色仍然无人替代。半个世纪以来分子泵技术不断创新，性能不断提升，应用领域越来越广。本讲座结合真空知识的几个要点，介绍以分子泵为主的各种真空泵的原理，特点及使用。希望其中经验和观点可以帮助你找到解决真空问题的正确思路和方法。

2磁悬浮技术及高速旋转机械的发展状况

报告人：沙宏磊，天津飞旋科技有限公司

时间：9月7日（周四）10:00

单位：中科院物理研究所

地点：M楼253室

磁悬浮轴承是一种电磁装置，可以使转子和定子之间不发生物理接触，相对位置保持稳定，维持转子位置的电磁力由磁悬浮控制器控制，具有无摩擦、不需润滑、高可靠和低损耗等优点，尤其适合高速应用。本报告涉及磁悬浮轴承及高速旋转机械原理，国际研究及发展情况，国内研究及产业化情况等方面，结合实际应用案例及效果，阐述磁悬浮轴承及高速旋转机械技术的优势，探讨未来应用方向。4

3Fromnano-structured superconductors to commercial high-current applications   

报告人：Yosef Yeshurun，Bar-Ilan University

时间：9月6日（周三）10:00

单位：中科院物理研究所

地点：M236 会议室

I will review the fundamental and applied-oriented research projects carried out at the Institute for Superconductivity at Bar-Ilan University (BIU), focusing on two topics: (a) The BIU Fault-Current-Limiters that have already been installed in UK utilities. (b) A current-induced switching between Little-Parks and SQUID magnetoresistance oscillations in a superconducting nano-ring without Josephson junctions.

4Large N_c limit QCD and symmetry preserving truncations for DS and BS equations

报告人：王青，清华大学

时间：9月6日（周三）15:30

单位：中科院理论物理研究所

地点：Conference Hall 322, ITP

We develop a framework for deriving Dyson-Schwinger Equations (DSEs) and Bethe-Salpeter Equation (BSE) in QCD at large N_c limit. The starting point is a modified form (with auxiliary fields) of QCD generating functional. This framework provides a natural order by order truncation scheme for DSEs and BSE, and the kernels of the equations up to any order are explicitly given. Chiral symmetry (at chiral limit) is preserved in any order truncation, so it exemplifies the symmetry preserving truncation scheme. It provides a method to study DSEs and BSE beyond the Rainbow-Ladder truncation, and is especially useful to study contributions from non-Abelian dynamics (those arise from gluon self-interactions). We also derive the equation for the quark-ghost scattering kernel, and discuss the Slavnov-Taylor identity connecting the quark-gluon vertex, the quark propagator and the quark-ghost scattering kernel.

5The new era of Galactic Archaeology

报告人：Yuan-Sen Ting，Princeton University

时间：9月7日（周四）14:00

单位：清华大学物理系

地点：蒙民伟科技南楼 S-727

Understanding physical processes responsible for the formation and evolution of galaxies like the Milky Way is a fundamental problem in astrophysics. However, a key challenge is that the properties and orbits of the stars can only be observed at present: to understand what happened in the Milky Way at earlier epochs, one must explore “archaeological” techniques. One idea, "chemical tagging,” aims to probe the history of the Milky Way via the unique imprint in chemical abundance space of long-disrupted star forming associations. I will discuss the opportunities and challenges associated with chemical tagging, including a first constraint on the disrupted cluster mass function in the Milky Way, and how Gaia, as well as extragalactic IFU studies, could be informative in the studies of chemical tagging. I will also describe a new set of tools for efficient measuring multi-elemental abundances from large quantities of low-resolution LAMOST spectra, for constraining the binary fraction in the Milky Way, and for inferring asteroseismic parameters from spectra alone.

6A mathematical theory of gapped/gapless edges of 2d topological orders

报告人：孔良，清华大学丘成桐数学科学中心

时间：9月7日（周四）15:30

单位：中科院物理研究所

地点：M楼830

I will clarify some basic notions in the field of topological orders. This naturally leads to the question on the bulk-edge relation or bulk-edge correspondence. Then I will give a unified mathematical theory of gapped/gapless edges of 2d topological orders. I will use blackboard in this lecture.

中国物理学会期刊网学术讲座列表

---

十大热门文章

1. 超导“小时代”之二十一：火箭式的速度

2. 物理学咬文嚼字之八十八：Bubble & Foam

3. 稳态磁场抑制肿瘤细胞生长机制

4.  昌明其德有辉 旋进其业有痕——回顾俞昌旋先生平凡又非凡的一生

5.  量子纠缠：从量子物质态到深度学习

6.  “冷分子制备与操控”专题讲座第二讲：分子束的静电Stark减速、静磁Zeeman减速和光学Stark减速技术

7.  我们的核废料该去哪？

8. 钙钛矿太阳能电池：其实我不含钙，也不含钛

9. “慢滑移”与地震

10. 飞剪帆船、竞速帆船和波形线理论

END

更多精彩文章，请关注微信号：cpsjournals

长按指纹 > 识别图中二维码 > 添加关注