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澄迈储罐保温施工 香港城市大学陆雅言锤真金不怕火、重庆大学韩德锤真金不怕火学术讲明

发布日期:2026-02-20 14:10:06 点击次数:171

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学术讲明1: From linear algebra to resonant wave phenomena澄迈储罐保温施工

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 澄迈储罐保温施工澄迈储罐保温施工

讲明东谈主:   陆雅言锤真金不怕火(香港城市大学数学系)

讲明时间: 219年11月26日(星期二)15:-17:3

讲明场地: 新藏书楼会议中心三会议室

 

摘录:   Resonance is important to mechanical systems (buildings, bridges, airplanes) and wave systems (sound waves, electromagnetic waves, light, matter waves). For a mechanical structure, if the external force has a frequency close to its natural frequency, the structure can have a violent vibration, and that is the resonance phenomena. From the perspective of linear algebra, the natural frequencies are eigenvalues of a matrix, the vibration caused by a forcing may be described by a linear system. The mechanical system may be dissipative, then the natural frequencies are complex. Wave systems are usually open.  For example, you can hear the sound from a loud speaker, because it is open, i.e., it radiates energy into the surrounding air. Open wave systems are more difficult to describe by linear algebra, because outgoing waves satisfy typically complicated radiation conditions. However, there is a so-called lattice model, which can be reduced to simple linear algebra problems, but it can describe resonant wave phenomena for open structures, and it gives a very nice illustration for concepts such as resonant frequencies, local field enhancement, quality factors, continuous spectra, and embedded eigenvalues. It also gives good physical examples for eigenvalues with geometric multiplicity less than algebraic multiplicity, which give rise to Jordan blocks of size larger than one.

 

讲明东谈主简介: 陆雅言锤真金不怕火,1988年于麻省理工学院取得博士学位,现为香港城市大学数学系锤真金不怕火。当今主要从事微纳光子结构的数学表面、模子和数值法面的参议,主握香港政府与各界基金风物近3项,在SIAM J. Appl. Math.、Phys. Rev. A、Opt. Lett.、Opt. Express、J. Comput. Phys.、J. Lightw. Technol.等有关域SCI杂志发表论文2余篇。

 

 

学术讲明2:微纳光子结构中些新物理当的参议

 

讲明东谈主:   韩德锤真金不怕火(重庆大学物理学院)

讲明时间: 219年11月26日(星期二)15:-17:3

讲明场地: 新藏书楼会议中心三会议室

 

摘录:比年来,好多新的物理当如拓扑应、类量子应,被发现闲居存在于光子体系之中。这些光子体系包括光子晶体、名义等离激元体系、构材料、以及二维材料如石墨烯等等。基于周期结构的能带表面,和“体-限制”对应的旨趣,东谈主们或者在发生拓扑相变的界面处找到对应的界面态。与之相对的,出能带表面,拓扑质还能在其他参数空间展现出来。本讲明将简介咱们在这两面的些分解,铁皮保温施工别离包括:1) 维系统中的SSH模子和二维系统中的“谷偏振”界面态;2) 平板光子晶体和名义等离激元体系中的贯串谱中的敛迹态(BIC)。咱们淡薄种“干系全反射”机制并广了传统的波条目,由此不错当然地得到平板光子晶体中的BIC。在金属纳米小球组成的SSH链中,咱们贯通讲明了巧的BIC的存在,并得到了相应的相图。

 

讲明东谈主简介:韩德,重庆大学“百东谈主霸术”参议员。21年复旦大学本科,23年纽约大学硕士,27复旦大学博士,香港科技大学博士后。主要参议域是光子晶体、名义等离激元和构材料。已在Nat. Commun., Phys. Rev.和OSA系列等杂志发表SCI论文近5篇,他引12余次。

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