Phase transitions with Allen-Cahn mean curvature bounded in Lp.
16:00-17:00
Talk & Lecture
1
2788521
/english/2023/0808/c19936a2788521/page.psp
2023-08-08
/_upload/article/images/ea/2d/57e74a2c4d419668766df9734d7e/d8d75163-bc02-4efe-8b77-313914d4e368_s.png
/_upload/article/images/ea/2d/57e74a2c4d419668766df9734d7e/d8d75163-bc02-4efe-8b77-313914d4e368.png
Speaker: Dr. WANG Shengwen (Queen Mary University of London)Time: 16:00-17:00, Aug.17Venue: 101, Building 2, Haina Court, Zijingang CampusAbstract: We consider the varifolds associated to a phase transition problem whose first variation of Allen-Cahn energy is Lp integrable with respect to the energy measure. We can see that the Dirichlet and potential part of the energy are almost equidistributed. After passing to the phase field limit, one can obtain an integer rectifiable varifold with bounded Lp mean curvature. This is joint work with Huy Nguyen.
We consider the varifolds associated to a phase transition problem whose first variation of Allen-Cahn energy is Lp integrable with respect to the energy measure.
2023-08-17 16:00:00
101, Building 2, Haina Court, Zijingang Campus
Generalising Dynamic Semiparametric Averaging Forecasting for Time Series with Discrete-valued Response
15:00
Talk & Lecture
2
2788432
/english/2023/0808/c19936a2788432/page.psp
2023-08-08
/_upload/article/images/3e/df/d00723674e7a8a207f0e1fcf1d1d/b45fb0af-cff0-45d4-8fb4-034723d21835_s.png
/_upload/article/images/3e/df/d00723674e7a8a207f0e1fcf1d1d/b45fb0af-cff0-45d4-8fb4-034723d21835.png
Speaker: Prof. Zudi Lu(University of Southampton)Venue: Tencent Meeting ID:196-247-817Time: 15:00, Aug.10Abstract: Dynamic discrete valued time series data exist in many economic applications, but its research is still relatively rare compared with the rich research of continuous-valued time series in semiparametric modelling. In this paper, we propose to explore how to utilise the useful high-dimensional dynamic lagged information for forecasting of time series data with discrete-valued response. Our approach will generalise the existing flexible semiparametric marginal regression model averaging (MARMA) forecasting of Li, Linton and Lu (2015), which has been shown a useful data-driven method, but was designed for nonlinear forecasting of continuous valued time series by a least squares averaging. We have hence suggested a generalised MARMA (GMARMA) procedure under a general time series conditional exponential family of distributions, which flexibly accommodates nonlinear forecasting of discrete-valued response, and further allowing the lagged effects including discrete-valued information for forecasting. A conditional likelihood model averaging method, instead of the least squares, is thus developed for the averaging weights estimation in the GMARMA, under beta-mixing time series data generating process with asymptotic normality established. Furthermore, an adaptively penalised GMARMA (PGMARMA) is suggested to select the important variables for an improved forecasting. The oracle properties of the PGMARMA weights are established as if the true non-zero weights were known. These procedures are further supported by Monte Carlo simulations and empirical applications to forecasting of the FTSE 100 index market moving direction and the UK road casualty data, which are shown to outperform many popular machine learning tools, including the random forest method, etc.Contact person: Prof.ZHANG Rongmao(rmzhang@zju.edu.cn)
In this paper, we propose to explore how to utilise the useful high-dimensional dynamic lagged information for forecasting of time series data with discrete-valued response.
2023-08-10 15:00:00
Online
IASM Distinguished Lectures: The p-adic Borel Hyperbolicity of A_g
16:15-17:15
Talk & Lecture
3
2787064
/english/2023/0731/c19936a2787064/page.psp
2023-07-31
/_upload/article/images/d8/c5/c58fcd6747ebacb112face8ca1e0/4a8c9216-f267-410a-90fd-af637f3713c9_s.png
/_upload/article/images/d8/c5/c58fcd6747ebacb112face8ca1e0/4a8c9216-f267-410a-90fd-af637f3713c9.png
Speaker: Prof. Xinwen Zhu (Stanford University)Time: 16:15-17:15, July 27Venue: lecture hall, Building 7, Zijingang CampusAbstract: A theorem of Borel says that any holomorphic map from a smooth complex algebraic variety to a smooth arithmetic variety is automatically an algebraic map. The key ingredient is to show that any holomorphic map from the punctured disc to the arithmetic variety has no essential singularity. I will discuss some work towards a p-adic analogue of this theorem for moduli of abelian varieties. Joint with Abhishek Oswal and Ananth Shankar.
Prof. ZHU Xinwen will discuss some work towards a p-adic analogue of a theorem of Borel for moduli of abelian varieties.
2023-07-27 16:15:00
lecture hall, Building 7, Zijingang Campus
TEXAS-INSPIRED DRUG DISCOVERY EFFORTS
15:00
Talk & Lecture
4
2787060
/english/2023/0731/c19936a2787060/page.psp
2023-07-31
/_upload/article/images/7d/de/cd714a8645a2812ab0320b7860c8/f320f7cf-55e7-4ef3-b20f-4b136a400bee_s.png
/_upload/article/images/7d/de/cd714a8645a2812ab0320b7860c8/f320f7cf-55e7-4ef3-b20f-4b136a400bee.png
Speaker: Prof. Jonathan L. Sessler (The University of Texas at Austin)Inviter: Prof. LI Hao (Zhejiang University)Venue: C100, Building 5, Haina Court, Zijingang Campus
Prof. Jonathan L. Sessler has published over 900 scholarly articles. He has coauthored two books, edited two others and been an inventor of record on 90 issued US Patents.
2023-08-04 15:00:00
C100, Building 5, Haina Court, Zijingang Campus
Global harmonic analysis
10:00
Talk & Lecture
5
2785733
/english/2023/0724/c19936a2785733/page.psp
2023-07-24
/_upload/article/images/ba/52/e004bfa04acf859757d8c7cbd463/6c916607-0c48-4493-8e96-0868cadbfc80_s.png
/_upload/article/images/ba/52/e004bfa04acf859757d8c7cbd463/6c916607-0c48-4493-8e96-0868cadbfc80.png
Speaker: Prof. HAN Xiaolong (California State University, Northridge)Venue: 102, Building 2, Haina Court, Zijingang CampusAbstract: The harmonics on a compact Riemannian manifold are the mathematical functions which describe the natural modes of oscillation. They are described by the eigenfunctions of the Laplacian, whose behaviors are heavily influenced by the global geometry of the manifold. In this talk, we discuss this relation in the study of global harmonic analysis, through two symmetric spaces: compact hyperbolic surfaces (constant negative curvature) and spheres (constant positive curvature). We explain how Laplacian eigenfunctions behave, both similarly and differently, on these two geometries.Contact person: Prof. XI Yakun (yakunxi@zju.edu.cn)
In this talk, we discuss this relation in the study of global harmonic analysis, through two symmetric spaces: compact hyperbolic surfaces (constant negative curvature) and spheres (constant positive curvature).
2023-07-26 10:00:00
102, Building 2, Haina Court, Zijingang Campus
Hölder stability of quantitative photoacoustic tomography based on partial data
10:00-11:00
Talk & Lecture
6
2785732
/english/2023/0724/c19936a2785732/page.psp
2023-07-24
/_upload/article/images/ef/a2/7c294b9343b9b6926915f0d23d4b/3a3b22f0-b831-4a03-ba2b-749cf4ede094_s.png
/_upload/article/images/ef/a2/7c294b9343b9b6926915f0d23d4b/3a3b22f0-b831-4a03-ba2b-749cf4ede094.png
Venue: 210, Building 2, Haina Court, Zijingang CampusSpeaker: Professor Faouzi Triki (University Grenoble Alpes)Abstract: The talk is related to the inverse problem of reconstructing the diffusion and absorption coefficients of the diffusion equation from internal data in photo-acoustic imaging. I will show that the problem is Hölder stable in subregions close to the boundary where the internal information is available. The Hölder exponent converges to a positive constant independent of the subregion as the subregion contracts towards the boundary. I will also present several numerical tests that illustrate the theoretical results.
The talk is related to the inverse problem of reconstructing the diffusion and absorption coefficients of the diffusion equation from internal data in photo-acoustic imaging.
2023-07-26 10:00:00
210, Building 2, Haina Court, Zijingang Campus
Strategies Direct Air Capture (DAC) of CO2: Chemistry's Contribution to a Societal Grand Challenge
15:00
Talk & Lecture
7
2783935
/english/2023/0717/c19936a2783935/page.psp
2023-07-17
/_upload/article/images/a2/32/8845a636474fabdc8b841a815877/3bab1c66-5674-49d6-9d65-659bf0a67255_s.png
/_upload/article/images/a2/32/8845a636474fabdc8b841a815877/3bab1c66-5674-49d6-9d65-659bf0a67255.png
Lecturer: Prof. Christopher W. JonesInviter: Prof. Bingfeng ShiVenue: C100, Building 5, Haina Court, Zijingang Campus
Dr. Jones leads a research group that works on materials, catalysis and
adsorption.
2023-07-27 15:00:00
C100, Building 5, Haina Court, Zijingang Campus
Strategies and Tactics in Natural Products Syntheses as an Engine for Discovery
14:00
Talk & Lecture
8
2783933
/english/2023/0717/c19936a2783933/page.psp
2023-07-17
/_upload/article/images/3b/6e/2ff53a2841a4950991ee09321320/0fb2e19c-6925-4341-9ea6-dcec0a4240b7_s.png
/_upload/article/images/3b/6e/2ff53a2841a4950991ee09321320/0fb2e19c-6925-4341-9ea6-dcec0a4240b7.png
Lecturer: Prof. Erick M. CarreiraInviter:Prof. Bingfeng ShiVenue: C100, Building 5, Haina Court, Zijingang Campus
Professor Carreira is a member of the National Academy of Sciences of USA,
American Academy of Arts and Sciences, and Leopoldina.
2023-07-27 14:00:00
C100, Building 5, Haina Court, Zijingang Campus
Number Theory and Representation Theory Seminar: Wavefront Sets and Generic L-parcket
16:00-17:00
Talk & Lecture
9
2783930
/english/2023/0717/c19936a2783930/page.psp
2023-07-17
/_upload/article/images/c9/76/7bb4f7184f67b1a747b0cd6a90c7/d4523d19-9ed9-4006-aa04-b7f27e86b717_s.png
/_upload/article/images/c9/76/7bb4f7184f67b1a747b0cd6a90c7/d4523d19-9ed9-4006-aa04-b7f27e86b717.png
Venue: Lecture Hall, Institute For Advanced Study in Mathematics, Zijingang CampusSpeaker: Prof. Zhang Lei, National University of SingaporeAbstract: In this talk, we introduce a notion of arithmetic wavefront sets for admissible representations of classical groups over local fields of characteristic 0. Conjecturally, via local Langlands correspondence, this arithmetic wavefronts coincide with the classical wavefront sets in sense of Harish-Chandra characters. Hence this conjecture proposes an algorithm to explicate the wavefront sets of representations in generic L- packets, by computing local symplectic root numbers. In particular, we verify the analogue conjectures over finite fields. This is a joint project with Dihua Jiang (The University of Minnesota), Dongwen Liu (Zhejiang University), Zhicheng Wang (Soochow University).
In this talk, we introduce a notion of arithmetic wavefront sets for admissible representations of classical groups over local fields of characteristic 0.
2023-07-19 16:00:00
Lecture Hall, Institute For Advanced Study in Mathematics, Zijingang Campus