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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 11 November 2020

Dr Adam Kirrander: Theoretical and experimental advances in ultrafast x-ray scattering

9:30am, Virtual (contact the host for a Zoom link)

New x-ray and electron scattering experiments provide a window onto ultrafast photochemical and photophysical dynamics. I will review recent experimental advances, including recent measurements of excited-state molecular structures [1] and observation of the changes in electron density associated with photoexcitation of a molecule [2]. Moving to computations and theory, we will look at how scattering cross-sections can be calculated and the physical insights we can draw from each type of scattering. In particular, we will discuss how experiments that transgress the distinction between structural dynamics and spectroscopy can be achieved. As an example, we will look at simulations of an experiment that tracks electron transfer and transient electronic coherences in a molecule using x-ray scattering.[3]

References

1

B. Stankus et al. Nature Chemistry 11 716 2019

2

H.W. Yong et al. Nature Communications 11 2157 2020

3

M. Simmermacher Physical Review Letters 122 073003 2019


Hugo Lavenant: Hidden convexity in a problem of nonlinear elasticity

12:00pm, zoom

The talk will be about compressible and incompressible nonlinear elasticity variational problems. Our contribution is to provide a convex relaxation for a class of non convex problem, together with sufficient conditions guaranteeing its tightness. Our relaxation is based on a notion of Dirichlet energy for measure valued mappings which is interesting in itself, and the proof of tightness relies on convex analysis and the study of a dual problem. 

This is joint work with Nassif Ghoussoub, Young-Heon Kim and Aaron Palmer (UBC): https://arxiv.org/abs/2004.10287 

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


DEI Online Seminar Series: The Emergence of Offshore Wind in the USA: Opportunities & Threats

1:00pm to 2:00pm, Online via Zoom, Professor Alan Lowdon, Invisotech & National Offshore Wind Institute, Massachusetts

Contact lynn.gibson@durham.ac.uk for more information about this event.


Joel Dahlin: Explosive Energy Release in the Solar Corona

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

Recent advances in solar instrumentation have revealed a rich variety of eruptive activity in striking detail. The largest such eruptions, coronal mass ejections and associated solar flares, drive the shocks and energetic particles that play a major role in the most hazardous space weather events. To predict the space weather impact of solar eruptions, we must understand three vital questions: How does energy build up in the corona? What triggers its explosive release? How is that energy transferred to nonthermal particles? To accurately model explosive activity, it is important to capture both the large-scale dynamics of the energy buildup and release and the fine-scale structure that plays a critical role in particle energization. I present recent advances in tackling these questions using high-resolution, three-dimensional magnetohydrodynamics simulations of solar eruptions. I also discuss promising avenues for future work and prospects for comparison to ground-based (DKIST, EOVSA) and space-borne (PSP, SolO) observations.

Contact Christopher Prior for more information about this event.


Research Seminar: The Making of Doctoral Supervisors: An International Comparative Study

3:00pm to 4:00pm, Zoom seminar, Stan Taylor, Honorary Professor of the School of Education

Contact ed.research@durham.ac.uk for more information about this event.