报告人： 徐劼 副研究员

报告题目： Quasi-entropy: in Free Energies and Closure Approximations

时间： 2026年9月7日 10:00—11:00

地点： 西安交通大学兴庆校区数学楼203会议室

邀请人： 郭士民

报告摘要：
Molecular-theory-based tensor models of liquid crystals typically contain an explicit entropy term deduced from the maximum entropy state. For dynamic models, high-order tensors also appear in the model, for which a classical closure approximation is also given the maximum entropy state. The maximum entropy state is able to maintain the essential properties and structures of the molecular theory in tensor models, but leads to high computational cost.

Quasi-entropy is a class of elementary functions to substitute the terms deduced from the maximum entropy state, which can be incorporated both in free energies and in closure approximations. It not only keeps the desired properties and structures of the models, but also reduces the complexity of dealing with implicit functions involving three dimensional integrals to $O(1)$. We present a few representative results in equilibrium states and dynamics.

报告人简介：
徐劼博士于2010年和2015年在北京大学分别获学士和博士学位，后在普渡大学从事博士后研究，现任职于中国科学院数学与系统科学研究院计算数学与科学工程计算研究所。徐劼博士在液晶建模与模拟、梯度流的数值方法方面取得了突出的原创成果。代表工作包括：针对复杂液晶分子发展了基于分子理论的系统建模方法；独立提出了拟熵这一可计算建模的有力工具；提出了梯度流的标量辅助变量（SAV）方法。曾获2024 ICCM Distinguished Paper Award 和 International Congress of Basic Science 2025 Frontiers of Science Award。