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DTSTART;TZID=Australia/Sydney:20221109T140000
DTEND;TZID=Australia/Sydney:20221109T150000
DTSTAMP:20260517T010211
CREATED:20221027T084702Z
LAST-MODIFIED:20221220T034510Z
UID:155-1668002400-1668006000@scigem-eng.sydney.edu.au
SUMMARY:Granular Forum — Seher Ata
DESCRIPTION:Bubble-bubble and bubble-particle interaction in froth flotation \n\n\n\nCoalescence of two bubbles coated with particles.
URL:https://scigem-eng.sydney.edu.au/event/granular-forum-seher-ata/
LOCATION:Civil Engineering J05 Lecture Theatre 3\, Civil Engineering Building\, J05\, The University of Sydney\, 2006\, Australia
CATEGORIES:Granular Forum
ORGANIZER;CN="Fran%C3%A7ois Guillard":MAILTO:francois.guillard@sydney.edu.au
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221019T110000
DTEND;TZID=Australia/Sydney:20221019T120000
DTSTAMP:20260517T010211
CREATED:20221020T014444Z
LAST-MODIFIED:20221220T034508Z
UID:80-1666177200-1666180800@scigem-eng.sydney.edu.au
SUMMARY:Granular Forum — A/Prof Mohammad Saadatfar
DESCRIPTION:Tomographic analysis of jammed ellipsoid packings.
URL:https://scigem-eng.sydney.edu.au/event/granular-forum-a-prof-mohammad-saadatfar/
LOCATION:Civil Engineering Conference Room\, Room 438\, Civil Engineering Building\, J05\, The University of Sydney\, NSW\, 2006\, Australia
CATEGORIES:Granular Forum
ORGANIZER;CN="Fran%C3%A7ois Guillard":MAILTO:francois.guillard@sydney.edu.au
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221005T150000
DTEND;TZID=Australia/Sydney:20221005T160000
DTSTAMP:20260517T010211
CREATED:20221020T053828Z
LAST-MODIFIED:20221220T034506Z
UID:92-1664982000-1664985600@scigem-eng.sydney.edu.au
SUMMARY:Granular Forum — Prof Olivier Buzzi
DESCRIPTION:Experimental and theoretical insights into the fragmentation of rocks upon impact in the context of rockfall. \n\n\n\nRockfall fragmentation is a common and very complex phenomenon that is still inadequately understood and rarely modelled. When falling rock blocks break upon impact\, their shape and size change and the kinetic energy is distributed amongst fragments. To efficiently design mitigation measures\, it is necessary to adequately account for fragmentation when modelling rockfall trajectories. To do so\, a better understanding of the fragmentation process\, its occurrence and its likely outcomes is needed. The rockfall research team at UoN have developed an experimental apparatus to study fragmentation of brittle objects upon impact on a concrete slab following a free fall. The team has also recently proposed a novel model which can predict the survival probability (SP) of brittle spheres upon impact from the statistical distribution of material parameters\, obtained by standard quasistatic tests (Brazilian tests and unconfined compression tests). The model predicts two Weibull parameters (shape parameter -m- and scale parameter – critical kinetic energy) that are used to define the SP. The model is based on theoretically-derived (from Hertzian contact theory) conversion factors used to transform the critical work required to fail disc samples in quasi-static indirect tension into the critical kinetic energy to cause failure of spheres at impact in vertical drop tests. The speaker will present the experimental apparatus\, discuss some of the key experimental results and introduce the survival probability model.
URL:https://scigem-eng.sydney.edu.au/event/granular-forum-prof-olivier-buzzi/
LOCATION:Civil Engineering Conference Room\, Room 438\, Civil Engineering Building\, J05\, The University of Sydney\, NSW\, 2006\, Australia
CATEGORIES:Granular Forum
ORGANIZER;CN="Fran%C3%A7ois Guillard":MAILTO:francois.guillard@sydney.edu.au
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220905T110000
DTEND;TZID=Australia/Sydney:20220905T120000
DTSTAMP:20260517T010211
CREATED:20221020T054250Z
LAST-MODIFIED:20221220T034502Z
UID:94-1662375600-1662379200@scigem-eng.sydney.edu.au
SUMMARY:Granular Forum — Dr Matthew MacAulay
DESCRIPTION:Hyperbolic tree embeddings for Bayesian inference of evolutionary trees. \n\n\n\nViruses\, like COVID-19\, evolve over time as mutations in the DNA sequence constantly produce different lineages on the tree of evolution. Finding this evolutionary tree allows scientists to better understand the similarity of strains\, regional outbreaks\, and aids in developing vaccines. Unfortunately\, there are a super-exponential number of trees\, resulting in many more candidate trees than there are atoms in the universe for COVID-19. Furthermore\, these trees are not always robust and may change wildly as new DNA sequences are analysed. \n\n\n\nTo better navigate through the high dimensional space of trees\, we embed them into hyperbolic space. This enables many powerful statistical and machine learning tools that only work on continuous parameters to work on discrete tree structures. For robustness\, we developed several Bayesian inference tools based on hyperbolic tree embeddings: maximum a priori\, Markov Chain Monte Carlo and variational inference. The last of which uses automatic differentiation\, a tool widely used in the deep learning community. \n\n\n\nWhilst this talk is on a problem from biology\, fear not. It is aimed at engineers interested in broader mathematical and statistical techniques for scientific problems.
URL:https://scigem-eng.sydney.edu.au/event/granular-forum-dr-matthew-macaulay/
LOCATION:Civil Engineering Conference Room\, Room 438\, Civil Engineering Building\, J05\, The University of Sydney\, NSW\, 2006\, Australia
CATEGORIES:Granular Forum
ORGANIZER;CN="Fran%C3%A7ois Guillard":MAILTO:francois.guillard@sydney.edu.au
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