In this talk we will give a sufficient and necessary condition on parabolic isometries of positive translation lengths on complete visibility CAT(0) spaces. One consequence is that each parabolic isometry of a complete simply connected visibility manifold of nonpositive sectional curvature has zero translation length. Applications on the geometry of open negatively curved manifolds will also be discussed

There are many fundamental and practical problems involving a wide range of length scales. The multiscale feature leads to great challenges for computation. Multiscale finite element method (MsFEM) is one of efficient approaches to solve the multiscale problems. The talk is devoted to presenting some progress in MsFEM with porous media application. To enhance the applicability and flexibility, we particularly introduce a least－squares mixed generalized MsFEM. Some numerical results are presented for flows in porous media

题目：Optimal Dividend and Investment Problems under Sparre Andersen Model报告人：柏丽华 博士 (南开大学)时间：2017年3月13日(星期一)下午3：00—4：00地点：致远楼102室欢迎各位参加

SYZ transformation is a geometric way to understand mirror symmetry , which is of great importance in geometry and physics. In this talk, Professor Conan Leung will discuss the history and his recent work on this “hot” topic.

We proposed a two-component generalization of the the Degasperis-Precesi equation. Firstly, under a pseudo 3-reduction, we have shown that the two-component reduced Ostrovsky equation can be reduced from an extended BKP hierarchy through a hodograph transformation. Its bilinear form and N-soliton solution in terms of pfaffians are constructed. One- and two-soliton solutions are presented. Moreover, we give a two-component generalization of the Degasperis-Precesi equation its Lax pair.

For any singular dominant integral weight $/lambda$ of a complex simple Lie algebra $/mathfrak{g}$, we show that all the indecomposable projective-injective modules in any fixed block of $/mathcal{O}_/lambda^/mathfrak{p}$ have the same Loewy lengths and the endomorphism of any projective-injective module in $/mathcal{O}^/mathfrak{p}_/lambda$ has a symmetric algebra structure, and it is equipped with a homogeneous non-degenerate associative bilinear form of degree equal to one minus that common Loewy length. This generalizes earlier work of Mazorchuk and Stroppel and confirms a conjecture of Khovanov. This talk is based on a joint work with Ngau Lam.

This presentation introduces the design and development of a hand gesture recognition system for UAV control in which 13 gestures are used. To train the system to recognize these gestures, we use hand skeleton data collected from a Leap Motion device. Adaptive Naïve Bayes Classifier (ANBC) and Support Vector Machines (SVM) are selected as base learning algorithms. An ensemble method is designed to improve the recognition accuracy based on the two selected classifiers. At implementation level, we developed three ROS (Robot Operating System) nodes to accomplish Feature Extraction, Gesture Recognition, and UAV Control functions.

题目：Fractional Partial Differential Equations: Modeling, Numerical Simulation, and Analysis报告人：Hong Wang （University of South Carolina and Shandong University）地点：致远楼107室时间：2016年12月28日 16：00Fractional partial differential equations (FPDEs) and related nonlocal models are emerging as a powerful tool for modeling challenging multiscale phenomena including overlapping microsco...