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In the context of hyperbolic systems of balance laws with dissipative source manifesting relaxation, recent pr"Ogress will be reported in the program of passing to the limit, in 1he BV setting, as the relaxation lime tends to zero.
Event date: 16/2/2023
Speaker: Prof. Constantine Dafermos (Brown University)
Hosted by: Department of Applied Mathematics
- Subjects:
- Mathematics and Statistics
- Keywords:
- Equilibrium -- Mathematical models Relaxation Differential equations Hyperbolic
- Resource Type:
- Video
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Video
Models arising in biology are often written in terms of Ordinary Differential Equations. The celebrated paper of Kermack-McKendrick (19271, founding mathematical epidemiology, showed the necessity to include parameters in order to describe the state of the individuals, as time elapsed after infection. During the 70s, many mathematical studies were developed when equations are structured by age, size, more generally a physiological trait. The renewal, growth-fragmentation are the more standard equations. The talk will present structured equations, show that a universal generalized relative entropy structure is available in the linear case, which imposes relaxation to a steady state under non-degeneracy conditions. In the nonlinear cases, it might be that periodic solutions occur, which can be interpreted in biological terms, e.g., as network activity in the neuroscience. When the equations are conservation laws, a variant of the Monge-Kantorovich distance (called Fortet-Mourier distance) also gives a general non-expansion property of solutions.
Event date: 19/1/2023
Speaker: Prof. Benoît Perthame (Sorbonne University)
Hosted by: Department of Applied Mathematics
- Subjects:
- Biology and Mathematics and Statistics
- Keywords:
- Biomathematics Equations
- Resource Type:
- Video
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Video
Universities conduct research for three reasons: to educate students, to contribute to society, and to understand the world. While society often holds a view of the scholar as a solitary and singular genius, in reality scholars today participate in a highly collaborative, worldwide search for shared understandings that stand the test of time and the scrutiny of others. The problems in the 21st century often demand effort by teams of researchers with resources at scale: laboratories and equipment, compute resources, and expert staffing. Working with faculty, students, and other stakeholders to identify the greatest opportunities and the resources needed to address them is both a privilege and a challenge for modern academic administrators. In this talk, I will share three examples: fostering collaborative proposal-writing; planning for shared capabilities in experimental facilities, data, and computation; and transforming academic structures.
Even date: 12/4/2023
Speaker: Prof. Kathryn Ann Moler
Hosted by: PolyU Academy for Interdisciplinary Research
- Subjects:
- Statistics and Research Methods
- Keywords:
- Research Science
- Resource Type:
- Video
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Video
中國戲曲源自新石器時代的巫術儀式，經歷漢代百戲、唐代戲弄和北宋雜劇，在北宋末融匯了多種形式的演出藝術、民歌、文人曲子及多種演唱文類，發展成戲曲鼻祖「南戲」。粵劇是清代地方劇種百花齊放的產品，既保留着近乎巫術儀式的《祭白虎》，也承傳着崑曲牌子、秦腔梆子、徽劇二黃、宋明南戲和元雜劇的劇目，堪稱中國戲曲的縮影。本講座概述當代香港粵劇的傳承狀況和中國戲曲的歷史面貌，從中探討粵劇如何保留和發展傳統戲曲的元素。講座將論及粵劇神功戲的演出、《祭白虎》儀式、戲班結構、行當、劇目題材、唱腔特點和傳承。
日期：2022年2月16日
講者：陳守仁教授
主辦：香港孔子學院, 中國文化學系
- Subjects:
- Chinese Studies, Hong Kong Studies, and Performing Arts
- Keywords:
- Operas Chinese Theater China China -- Hong Kong
- Resource Type:
- Video
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Video
作為宋遼夏金時期的一個王朝，西夏歷史文化有突出的特色，同時與中原文化有著內在的、緊密的聯繫。西夏參照漢字創制了民族文字西夏文，形成了很多文獻；吸納儒學，尊孔子為文宣帝；提倡漢學，實行科舉，培養人才；借鑒中原王朝法律，編纂法典，保存了最早的少數民族文字《律令》，豐富中華法系；接受中原社會習俗，存留下大批珍貴社會文書；弘揚中原印刷術，發明木活字印刷，有最早的活字印刷實物；尊崇佛教，翻譯中原大藏經，出土了數千卷佛經。西夏同時也吸收了臨近吐蕃、回鶻等民族的文化。西夏文化是中華民族優秀傳統文化的有機組成部分，對中華民族文化做出了重要貢獻。
日期：2022年3月11日
講者：史金波教授
主辦：香港孔子學院, 中國文化學系
- Subjects:
- Chinese Studies
- Keywords:
- Civilization Xi Xia Dynasty (China) History China
- Resource Type:
- Video
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Video
In this CIHK webinar, we will discuss the material conditions of and historical background to the use of Classical Chinese or Literary Sinitic in writing-mediated brush conversation between literati of Sinitic engaged in cross-border communication within Sinographic East Asia or the Sinographic cosmopolis, which corresponds with today’s China, North Korea, South Korea, Japan (including Okinawa, formerly the Ryukyu Kingdom) and Vietnam. Compared with speech as a modality of communication, real-time writing-mediated interaction between talking humans, synchronously face-to-face, seems uncommon. In any society, speaking is premised on one condition: the interlocutors must have at least one shared spoken language at their disposal, but even then, there are circumstances under which speaking is either physically not feasible or socially inappropriate. Could writing function as an alternative modality of communication when speaking is not an option due to the absence of a shared spoken language, as in cross-border communication settings? Whereas real-time writing-mediated face-to-face interaction is rare where a regional lingua franca was known to exist (e.g., Latin and Arabic), there is ample historical evidence of literati of Classical Chinese or Literary Sinitic from different parts of Sinographic East Asia conducting ‘silent conversation’, synchronously and interactively in writing mode using brush, ink, and paper. Such a pattern of writing-assisted interaction is still practiced and observable in pen-assisted conversation – pen-talk – between Chinese and Japanese speakers today, thanks to the pragma-linguistic affordance of morphographic, non-phonographic sinograms (i.e., Chinese characters and Japanese kanji). We will outline the historical spread of Classical Chinese or Sinitic texts from the ‘center’ to the ‘peripheries’, and the historical background to the acquisition of literacy in Sinitic by the people there. Their shared knowledge of Sinitic helps explain why, for well over a thousand years until the 1900s, literati from these places were able to speak their mind by engaging in ‘Sinitic brush-talk’ 漢文筆談 in cross-border communication.
Even date: 13/5/2022
Speaker: Prof. David C. S. Li
Hosted by: Confucius Institute of Hong Kong, Department of Chinese Culture
- Subjects:
- Chinese Language and Language and Languages
- Keywords:
- Chinese characters History Chinese language -- Written Chinese Written communication China East Asia
- Resource Type:
- Video
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Video
Focusing on tensions and links between national formation and international outlooks, this talk shows how classical world visions persist as China’s modernizers and revolutionaries adopted and revised the Western nation-state and cosmopolitanism. The concepts of tianxia (all under heaven) and datong (great harmony) have been updated into outlooks of global harmony that value unity, equality, and reciprocity as strategies of overcoming interstate conflict, national divides, and social fragmentation. The talk will delve into two debates: the embrace of the West vs. aspirations for a common world, and the difference between liberal cosmopolitanism and socialist internationalism.
Even date: 16/9/2022
Speaker: Prof. Ban Wang
Hosted by: Confucius Institute of Hong Kong, Department of Chinese Culture
- Subjects:
- Chinese Studies
- Keywords:
- Civilization Diplomatic relations World politics China
- Resource Type:
- Video
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Video
世界遺產「左江花山岩畫文化景觀」，綿延105公里，其中最大的單幅岩畫有8000平米。這一遺產有八個謎：何人、何時、出於什麼目的，投入如此巨大的人力物力，在懸崖峭壁之上繪製令人震撼的岩畫群？是用什麼顏料繪製千年不褪色？是怎樣畫上去的？為什麼人的圖像都是蛙形？岩畫中有數百面銅鼓，為什麼？為何這一世界遺產叫「文化景觀」？如今在廣西少數民族地區還有哪些岩畫遺風？
日期：2022年10月13日
講者：萬輔彬教授
主辦：香港孔子學院, 中國文化學系
- Subjects:
- Chinese Studies
- Keywords:
- Rock paintings China -- Zuo River Valley
- Resource Type:
- Video
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Video
古代中國幅員遼闊，習俗各異，如何實行統一管理是一大難題。秦朝用嚴刑峻法移風易俗，激起東方社會的激烈反抗，很快歸於失敗。西漢初年郡國並行，允許東方王國在一定程度上從俗而治。但王國勢力太大，危及國家的統一，文景二帝不得不收奪諸侯王的自治權。為了避免重蹈亡秦覆轍，儒生們提出“德教”主張，其中又包含“以禮為治”和“以德化民”兩種方案。受其影響，武帝以後的朝廷政策繼續表現出大幅度搖擺，至漢末魏晉才確立了基本符合當時國情的治理模式。
日期：2022年11月22日
講者：陳蘇鎮博士
主辦：香港孔子學院, 中國文化學系
- Subjects:
- Chinese Studies
- Keywords:
- Han Dynasty (China) Politics government Jin Dynasty (China : 265-419) China Public administration Qin Dynasty (China)
- Resource Type:
- Video
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Video
More than one hundred years ago, Albert Einstein published his Theory of General Relativity (GR). One year later, Karl Schwarzschild solved the GR equations for a non-rotating, spherical mass distribution; if this mass is sufficiently compact, even light cannot escape from within the so-called event horizon, and there is a mass singularity at the center. The theoretical concept of a 'black hole' was born, and was refined in the next decades by work of Penrose, Wheeler, Kerr, Hawking and many others. First indirect evidence for the existence of such black holes in our Universe came from observations of compact X-ray binaries and distant luminous quasars. I will discuss the forty-year journey, which my colleagues and I have been undertaking to study the mass distribution in the Center of our Milky Way from ever more precise, long-term studies of the motions of gas and stars as test particles of the space time. These studies show the existence of a four million solar mass object, which must be a single massive black hole, beyond any reasonable doubt.
Even date: 9/2/2023
Speaker: Prof. Reinhard GENZEL
Hosted by: PolyU Academy for Interdisciplinary Research
- Subjects:
- Physics and Cosmology and Astronomy
- Keywords:
- Nobel Prize winners Astrophysics Astronomy Deep space -- Milky Way Black holes (Astronomy) General relativity (Physics)
- Resource Type:
- Video
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