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学术报告：Homoclinic/heteroclinic cycles and chaos in a class of 3D three-zone piecewise affine systems
2022-10-22
报告人：杨启贵教授 华南理工大学主持人：袁利国副教授  时间与地点：2022年10月25日16:30-18:30，#腾讯会议：474-756-406报告摘要：Little results seem to be known about homoclinic/heteroclinic cycles and chaos in three dimensional (3D) piecewise smooth dynamical systems with two or more discontinuous boundaries (DBs). This report first introduces a new class of 3D three-zone piecewise affine sy...
学术报告：Existence of at most two limit cycles for some non-autonomous differential equations
2022-10-21
报告人：赵育林教授 中山大学主持人：袁利国副教授  时间与地点：2022年10月25日14:30-16:30，#腾讯会议：474-756-406报告摘要：It is know that the non-autonomous differential equations  dx/dt=a(t)+b(t)|x|, where  a(t)  and b(t) are 1-periodic maps of class $C^1$, have no upper bound for their number of limit cycles (isolated solutions satisfying  x(0)=x(1)). We prove that if...
学术报告：拟微分算子与时频分析
2022-09-28
报告人：钱涛教授(澳门科技大学)日期：2022年 9月29日时间：16:00-17:30腾讯会议ID：点击链接入会，或添加至会议列表：https://meeting.tencent.com/dm/fqaZMNQiCK8WAbstract: The talk will exposit  the general rule of Hardy H^2 space decomposition of L^2 spaces on manifolds. On the unit circle case we generalise the concept of Fourier frequency leading to instantaneous frequency decomposition of signals...
学术报告：Low-Rank High-Order Tensor Completion with Applications in Visual Data
2022-05-16
报告时间：5月18日周三上午10：00-11：00线上报告：腾讯会议 454-114-410主办单位：华南农业大学数学与信息学院摘要：Recently, tensor Singular Value Decomposition (t-SVD)-based low-rank tensor completion has achieved unprecedented success in addressing various pattern analysis issues. However, existing studies mostly focus on third-order tensors while order-d (d ≥ 4) tensors are commonly encountered in ...
学术报告： Adaptive estimation for functional data: Using a framelet block-thresholding method
2022-05-04
报告人：陈迪荣 教授（北京航空航天大学）报告时间：2022年5月5日（周四） 上午10:00-11:00报告地点：腾讯会议，会议号254115816主办单位：华南农业大学数学与信息学院 报告摘要：Nonparametric estimation of mean and covariance functions based on discretely observed data is important in functional data analysis. In this talk, we propose a framelet block-thresholding method for estimating mean and covarian...