2019-'20 AIMS seminar schedule

For details on all the speakers, click the links below.

AIMS seminars take place on Tuesdays from 1:15pm - 2:05pm in 4W 1.7 (Wolfson Lecture Theatre) unless otherwise noted.

4 Feb 2020

Clodoaldo Ragazzo (University of São Paulo)

Modelling of tidal forces with application to the librations of Enceladus

I will present the basic elements of the theory of tidal deformations. I will show how different visco-elastic models can be used to describe the rheology of a celestial body. The results are presented by means of a concrete application: the analysis of the libration of Enceladus due to Saturn.

11 Feb 2020

Sabine Hauert (University of Bristol)

Swarm engineering across scales: From nanomedicine to robots

Swarm engineering allows us to make robots that work in large numbers (over 1000), and tiny sizes (under 1 cm). Swarm strategies are either inspired from nature (ant colonies, fish shoals, bird flocks, cellular systems) or are automatically discovered using machine learning and crowdsourcing. Demonstrated applications range from the deployment of swarms of flying robots to create outdoor communication networks, or the use of 1000 coin-sized robots to form structures and explore the environment, to the design of nanoparticles for cancer treatment.

18 Feb 2020

Hermes Gadelha (University of Bristol)

Wiggly mathematical tales of a sperm tail and other fables

Breakthrough research into the mathematics of the sperm tail has profound implications for life itself, from human reproduction to the left-right symmetry of organs in our body, including vital, though finite, ramifications for Brexit, the universe and everything else. In this talk, I will attempt to brainwash the audience into thinking that fluid dynamics, elasticity and some exquisite Green’s functions will change your life (they won’t). After genius-level mathematical calculations, I will endeavour to show some predictive insights into the movement of this specialised microorganism, with little-to-no impact in real life. Connecting Alan Turing, Stokes, quantum theory and Olympic swimmer Michael Phelps, this talk will recount the never-ending mathematical fables of the sperm.

3 Mar 2020

Dwaipayan Chakrabarti (School of Chemistry, University of Birmingham)

Colloids Get Creative: Key to Open Crystals

Open crystals are sparsely populated periodic structures [1], which, when composed of colloidal particles, are appealing for their variety of applications, for example, as photonic materials, phononic and mechanical metamaterials, as well as porous media [1-5]. Although colloidal particles are promising building blocks for bottom up routes to crystals, programming self-assembly of colloidal particles into open crystals has proved to be elusive. Building on our recent work [6-8], I will here talk about a hierarchical self-assembly scheme for triblock patchy particles to address the challenges met with programming self-assembly into colloidal open crystals [9-12]. The presentation will demonstrate in silico the hierarchical self-assembly of colloidal open crystals via what we call closed clusters, which stop to grow beyond a certain size in the first stage and are thus self-limiting. By employing a variety of computer simulation techniques, I will show that the design space supports different closed clusters (e.g. tetrahedra or octahedra with variable valences) en route to distinct open crystals. Our design rules thus open up the prospects of realising a number of colloidal open crystals from designer triblock patchy particles, including certain colloidal open crystals much sough-after for their attractive photonic applications.

References [1] M. Cates, Nature Mater., 2013, 12, 179-180. [2] J. D. Joannopoulos, P. R. Villeneuve and S. Fan, Nature, 1997, 386, 143. [3] K. Aryana and M. B. Zanjani, J. Appl. Phys., 2018, 123, 185103. [4] X. Mao and T. C. Lubensky, Annu. Rev. Condens. Matter Phys., 2018, 9, 413. [5] X. Mao, Q. Chen and S. Granick, Nature Mater. 2013, 12, 217. [6] D. Morphew and D. Chakrabarti, Nanoscale, 2015, 7, 8343. [7] D. Morphew and D. Chakrabarti, Soft Matter, 2016, 12, 9633. [8] D. Morphew and D. Chakrabarti, Nanoscale, 2018, 10, 13875. [9] D. Morphew, J. Shaw, C. Avins and D. Chakrabarti, ACS Nano, 2018, 12, 2355. [10] A. B. Rao et al., Manuscript in communication, 2019. [11] A. Neophytou et al., Manuscript in preparation, 2020. [12] J. Shaw et al., Manuscript in preparation, 2020.

11 Mar 2020

Kit Yates (University of Bath)

The Maths of Life and Death

IMI Public lecture, Wednesday 4.15pm in Room 2.6, The Chancellors' Building

Maths has a profound influence on our lives. Learn how maths is important in everything from disease outbreak, and criminal justice to choosing where to eat.

17 Mar 2020

Lisa Kreusser (University of Cambridge)

An anisotropic interaction model for simulating fingerprints

The recent, rapid advances in modern biology and data science have opened up a whole range of challenging mathematical problems. In this talk I will discuss a class of interacting particle models with anisotropic repulsive-attractive interaction forces. These models are motivated by the simulation of fingerprint databases, which are required in forensic science and biometric applications. In existing models, the forces are isotropic and particle models lead to non-local aggregation PDEs with radially symmetric potentials. The central novelty in the models I consider is an anisotropy induced by an underlying tensor field. This innovation does not only lead to the ability to describe real-world phenomena more accurately, but also renders their analysis significantly harder compared to their isotropic counterparts. I will discuss the role of anisotropic interaction in these models, present a stability analysis of line patterns, and show numerical results for the simulation of fingerprints.

24 Mar 2020

Mike Fraser (Department of Computer Science, University of Bath)

Multi-Material Fabrication through Acoustic Patterning

Room 5.1, The Chancellors' Building

Fabrication techniques often depend on specific materials, reducing designers' ability to play with and combine diverse forms. Acoustic technologies offer the opportunity to advance fabrication processes by applying ultrasound fields to actuate liquids and solids into defined patterns. Unlike existing multi-material prototyping, acoustic fields can pattern a broad scope of materials and a wide range of material scales. We demonstrate acoustic fabrication, establish forms and patterns that are created by typical standing waves, and show the ability to rapidly compose multi-material patterns with objects, particles and aerosols. Our approach emphasizes the playful nature of including everyday materials in design, and highlights opportunities for using more sustainable materials in rapid prototyping.