應(yīng)yl7703永利官網(wǎng)鄧偉華教授和許鵬博博士的聯(lián)合邀請(qǐng)，德國(guó)波茨坦大學(xué)物理與天文研究所教授Ralf Metzler將于近期進(jìn)行線上學(xué)術(shù)報(bào)告。

報(bào)告題目：DON'T AVERAGE! --- LEARNING FROM FLUCTUATIONS IN DIFFUSIVE PROCESSES

時(shí)    間：2020年12月10日16:30

地    點(diǎn)：理工樓 518

線上報(bào)告ID：827 196 794（騰訊會(huì)議，密碼：202012）

報(bào)告摘要：After a brief introduction to the history of Brownian motion I will address current challenges to the physical understanding of diffusive processes in complex systems. These challenges arise from modern experimental techniques such as single particle tracking as well as supercomputing studies. Typically, these approaches provide relatively few trajectories of tracer particles, of finite measurement time. Evaluating individual trajectories, for instance, in terms of time-averaged mean squared displacements, the results will naturally fluctuate from one trajectory to another. Instead of averaging further over all measured trajectories, I will argue that one can extract valuable information from these fluctuations, helping us to decipher the physical mechanisms behind the observed particle motion, including measurement noise. For both normal and anomalous diffusion the exact form of these fluctuations will be discussed for measured moments as well as the single-trajectory power spectrum. Moreover, the emergence of non-Gaussian forms of the displacement distribution due to inhomogeneous environments will be addressed. In a similar spirit I will argue that cognisance of the entire distribution of reaction times is vital for the understanding of low-concentration chemical reactions, rather than focusing on mean reaction rates. Finally, current data science approaches to the analysis of diffusing data are introduced in terms of Bayesian and machine learning techniques.

個(gè)人簡(jiǎn)介

Ralf Metzler教授是德國(guó)波茨坦大學(xué)的終身教授，理論物理系主任，物理和天文學(xué)研究所所長(zhǎng),統(tǒng)計(jì)物理和反常統(tǒng)計(jì)動(dòng)力學(xué)領(lǐng)域的國(guó)際著名專家。Metzler教授于1996年獲得博士學(xué)位，1998年至2000年在特拉維夫大學(xué)任博士后研究員，2000年至2002年在麻省理工學(xué)院任博士后研究員，2006年至2007年在渥太華大學(xué)任副教授，2007年至2011年在慕尼黑大學(xué)任教授，2011年至今任波茨坦大學(xué)理論物理終身教授。他有相當(dāng)豐富的科研成果，多次在Phys. Rev. Lett.，Proc. Natl. Acad. Sci. USA，Sci. Rep.，New J. Phys.等世界著名期刊上發(fā)表論文，目前發(fā)表文章250余篇，被引用次數(shù)超過16900次，H指數(shù)59。

甘肅省高校應(yīng)用數(shù)學(xué)與復(fù)雜系統(tǒng)省級(jí)重點(diǎn)實(shí)驗(yàn)室

yl7703永利官網(wǎng)

萃英學(xué)院

2020年12月8日