【Becoming Global Billionaires from Mainland China: Theory and Evidence】2019年3月19日（周二）14:00-15:30【主讲】肖可舟【地点】北京大学经济学院305会议室【内容】The increase in the number of global billionaires from mainland China is a puzzle viewed from the standpoint of “extractive institutions”. Guided by a proposed conceptual framework relating socio-political backgrounds of the billionaire entrepreneurs to observable financing decisions, I show, under conditions of an open economy, politically unconnected billionaire entrepreneurs (e.g., Jack Ma) could attenuate, to some degree, political economy as well as financial frictions via capital injections from foreign venture capitalists. Building a unique database, I find, using a human equation, that (i) the politically unconnected billionaire entrepreneurs financed by foreign venture capitalists are more likely to float their companies outside mainland China (mainly in Hong Kong and the U.S), use offshore financing vehicles, and enter into innovative sectors; and (ii) the politically connected global billionaire entrepreneurs, however, are strongly associated with a record of state-owned enterprise (SOE) restructuring.
【Precision Medicine of Lung and Liver cancer: Focus of Microbiome and Metabolome】2019年3月19日（周二）16:00-17:00【主讲】Curtis C. Harris，M.D【地点】北京大学医学部国际合作交流中心二层会议室
【The compressible Euler equations with gravity: well-balanced schemes and all Mach number solvers】2019年3月19日（周二）14:00-15:00【主讲】Prof. Christian Klingenberg (Institut für Mathematik, Lehrstuhl für Mathematik VI, Universität Würzburg, Germany)【地点】Room 1303, Sciences Building No. 1, Peking University【内容】We consider astrophysical systems that are modeled by the multidimensional Euler equations with gravity. First for the homogeneous Euler equations we look at flow in the low Mach number regime. Here for conventional finite volume discretizations one has excessive dissipation in this regime. We identify inconsistent scaling for low Mach numbers of the numerical fux function as the origin of this problem. Based on the Roe solver a technique that allows to correctly represent low Mach number flows with a discretization of the compressible Euler equations is proposed. We analyze properties of this scheme and demonstrate that its limit yields a discretization of the incompressible limit system. Next for the Euler equations with gravity we seek well-balanced methods. We describe a numerical discretization of the compressible Euler equations with a gravitational potential. A pertinent feature of the solutions to these inhomogeneous equations is the special case of stationary solutions with zero velocity, described by a nonlinear PDE, whose solutions are called hydrostatic equilibria. We present well-balanced methods, for which we can ensure robustness, accuracy and stability, since it satisfies discrete entropy inequalities. We will then present work in progress where we combine the two methods above. This is joint work among others with Fritz Röpke, Christophe Berthon and Markus Zenk.
【The universe in a computer: how mathematical and numerical methods are essential】2019年3月19日（周二）10:00-11:00【主讲】Christian Klingenberg (Institut für Mathematik, Lehrstuhl für Mathematik VI, Universität Würzburg, Germany) 【地点】Room 1418, Sciences Building No. 1, Peking University【内容】We will talk about our contribution to a large project with the goal of a self-consistent numerical simulation of the evolution of the universe beginning soon after the Big Bang and ending with the formation of realistic stellar systems like the Milky Way. This is a multi-scale problem of vast proportions. It requires the development of new numerical methods that excel in accuracy, parallel scalability to the processes relevant in galaxy formation. These numerical methods themselves require the development of mathematical theory in order to guarantee the above mentioned requirements. in this talk we shall focus on our contribution to this effort. This is joint work among others with Volker Springel.
【Chern-Ricci Flow on the Inoue Surfaces】2019年3月20日（周三）14:00-15:00【主讲】Tao Zheng (Beijing Institute of Technology)【地点】Room 77201, Jingchunyuan 78, BICMR，Peking University【内容】In this talk, we will first recall some preliminaries about the Chern-Ricci flow, then we talk about the properties of the Chern-Ricci flow on the Inoue surfaces which are non-Kahler compact complex surfaces of type Class VII. We prove that, after an initial conformal change, the flow always collapses the Inoue surface to a circle at infinite time, in the sense of Gromov-Hausdorff. This is a joint work with Professor Shouwen Fang, Valentino Tosatti and Ben Weinkove.
【Instantaneously Complete Chern-Ricci Flow and K\"ahler-Einstein Metrics】2019年3月20日（周三）15:20-16:20【主讲】Shaochuang Huang (Tsinghua University)【地点】Room 77201, Jingchunyuan 78, BICMR, Peking University【内容】In this talk, we study the Chern-Ricci flow on complete non-compact Hermitian manifold with "negative first Chern class" (We will give the definition in the talk). Under certain general conditions (the initial metric may be incomplete or with unbounded curvature or even only an nonnegative Hermitian form), we prove the flow can be instantaneously complete and has a long-time solution converging to a complete negative Kahler-Einstein metric. In general, we can not conclude the flow tends to the initial metric smoothly and locally, we also discuss conditions so that this is true. These works are joint with Man-Chun Lee and Professor Luen-Fai Tam.
【The Long-time Solution of the Kahler-Ricci Flow and Collapsing Monge-Ampere Equation.】2019年3月20日（周三）16:40-17:40【主讲】Wangjian Jian (Peking University)【地点】Room 77201, Jingchunyuan 78, BICMR，Peking University【内容】We will talk about the long-time solution of the Kahler-Ricci flow on minimal model with intermediate Kodaira dimension. We will first introduce the basic knowledge of such flow and relevant progreesses in recent years, for example the relative volume comparison of Tian-Zhang. The main obstruction here is the collapsing of the metric. Finally I will talk about the scalar curvature convergence of such flow, and give the outline of the proof.
【冷战教训对当今大国的启示】2019年3月20日（周三）19:30【主讲】文安立（Odd Arne Westad）教授 【地点】中国人民大学明国408报告厅
【Striatal Neural Correlates of Motor Functions】2019年3月20日（周三）16:00-17:00【主讲】Lifeng Zhang【地点】北京大学英杰交流中心306会议室
