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Durham University

Research & business

Research lectures, seminars and events

The events listed in this area are research seminars, workshops and lectures hosted by Durham University departments and research institutes. If you are not a member of the University, but  wish to enquire about attending one of the events please contact the organiser or host department.


 

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Events for 25 November 2020

Dr Vinh Nguyen: Much ado about a ring: The curious case of tropylium ion

9:00am, Virtual (contact the host for a Zoom link)

Bernard Helffer: Spectral flow for pair compatible equipartitions (after B. Helffer and M. Persson Sundqvist)

12:00pm, zoom

Given a bounded open set $\Omega$ in $ \mathbb R^2$ and a regular
partition of $\Omega$ by $k$ open sets $D_j$, and assume that:

* This is an equipartition $\mathfrak l_k:= \lambda(D_j)$(for all $j$) where $\lambda(D_j)$ is the ground state energy of the Dirichlet realization of the Laplacian in $D_j$

* It has the pair compatibility condition, i.e. for any pair of neighbors in the partition $D_i,D_j$, there is a linear combination of the ground states in $D_i$ and $D_j$ which is an eigenfunction of the Dirichlet problem in $\Inte(\overline{D_i\cup D_j})$.

Typical examples are nodal partitions and spectral minimal partitions.
The aim is to extend the indices and Dirichlet-to-Neumann like
operators introduced by Berkolaiko--Cox--Marzuola in the nodal case to this more general situation. Like in the analysis of minimal partitions, this will
involve in particular the analysis of suitable Aharonov-Bohm operators.

Contact megan.k.griffin-pickering@durham.ac.uk for more information about this event.


Jie Jiang: Nonlinear and Stochastic Mechanisms for Solar Cycle Variability

2:00pm, https://durhamuniversity.zoom.us/j/92025466169?pwd=ZnI3ZHVqejlQQU4wQVNSeTgzcmZhUT09

Apart from its about 11-year periodicity, the most striking property of the solar activity record is the notable variability of the cycle amplitudes. Nonlinear and/or stochastic mechanisms are required to modulate the cycle amplitudes. During the past decade, Babcock-Leighton (BL) mechanism is demonstrated at the essence of the solar cycle. In the seminar, I will present our series of studies on the identification and quantitative evaluation of nonlinear and stochastic mechanisms on understanding of solar cycle variability in the framework of BL-type solar dynamo.

Contact Christopher Prior for more information about this event.