School of Mathematics and Statistics - Applied Seminar
https://www.maths.unsw.edu.au/category/school-seminar-series/applied-seminar
enBayesian search for MH370 and spacetime dynamical methods
https://www.maths.unsw.edu.au/seminars/2019-05/bayesian-search-mh370-and-spacetime-dynamical-methods
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Péter Koltai</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">Freie Universität Berlin</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 09/05/2019 - 11:05am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-4082</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p class="western" style="margin-bottom: 0in; line-height: 100%;"><span style="color: #000000;"><span style="font-family: Calibri;"><span style="font-size: small;"><span lang="en-GB" xml:lang="en-GB">In the first part of this talk a data-based Markov-chain model is constructed for the probabilistic evolution of marine debris from the missing Malaysian Airlines flight MH370. Based on the beaching location and time of the confirmed MH370 debris different probabilistic tools are employed to narrow down the potential crash site of the aircraft.<br /> The second part of the talk is concerned with the essential macroscopic transport behaviour of flows. It presents connections between the measure-theoretic autonomous and non-autonomous concepts by embedding the latter in an augmented space. This characterisation allows for efficient optimisation of the mixing behaviour of flows subject to an admissible set of perturbations.</span></span></span></span></p>
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<p class="western" style="margin-bottom: 0in; line-height: 100%;"><span style="color: #000000;"><span style="font-family: Calibri;"><span style="font-size: small;"><span lang="en-GB" xml:lang="en-GB">Péter Koltai is a researcher at the Freie Universität Berlin, working on data-based modelling of complex systems. In the first part of his talk, he employs different probabilistic tools to narrow down the potential crash site of the missing MH370 aircraft based on the beaching location and time of the debris found. In the second part, he introduces spatiotemporal characterisations of dominant dynamics in unsteady flows, viable for mixing optimisation.</span></span></span></span></p>
<p> </p></div></div></section><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Thu, 02 May 2019 06:50:07 +0000z33407774953 at https://www.maths.unsw.edu.auAddressing redundancy in column generation using Benders' decomposition cuts
https://www.maths.unsw.edu.au/seminars/2019-05/addressing-redundancy-column-generation-using-benders-decomposition-cuts
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Dr Stephen J Maher</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">Zuse Institute Berlin / Lancaster University</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 16/05/2019 - 11:05am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">MC-032, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p>When solving the linear programming (LP) relaxation of a mixed-integer program (MIP) with column generation, columns might be generated that are not needed to express any integer optimal solution of the MIP. Such columns are called strongly redundant and the dual bound obtained by solving the LP relaxation is potentially stronger if these columns are not generated. We introduce a sufficient condition for strong redundancy that can be checked by solving a compact LP. Using a dual solution of this compact LP we generate classical Benders cuts for the subproblem so that the generation of strongly redundant columns can be avoided. The potential of these cuts to improve the dual bound of the column generation master problem is evaluated computationally using an implementation in the branch-price-and-cut solver GCG. While their efficacy is limited on classical problems, the cuts’ usefulness is significantly demonstrated on structured models, when a temporal decomposition can be applied.</p>
<p><span lang="en-GB" xml:lang="en-GB"><strong>Dr Stephen J Maher</strong> is an alumnus of UNSW, having completed his PhD in Mathematics in 2014. Since completing his PhD, Stephen has work in research groups at the Zuse Institute Berlin and Lancaster University. Stephen is a core member of the development team for the mixed integer programming solver SCIP, which is hosted at the Zuse Institute Berlin. As part of this role, he has investigate the use of decomposition techniques in various parts of mixed integer programming solvers. Most recently, his work has involved the development of a general framework for the classical mathematical programming technique of Benders' Decomposition. Stephen has also started an initiative to educate people about optimisation in the real world through his website <a href="http://www.optimisationintherealworld.co.uk/" target="_blank">www.optimisationintherealworld.co.uk</a>.</span></p>
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<p> </p></div></div></section><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Sun, 07 Apr 2019 23:55:21 +0000z33407774926 at https://www.maths.unsw.edu.auDiscontinuous Galerkin Time-Stepping
https://www.maths.unsw.edu.au/seminars/2019-04/discontinuous-galerkin-time-stepping
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Bill McLean</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">School of Mathematics and Statistics, UNSW</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 18/04/2019 - 11:05am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-4082, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p>This talk is an overview of the discontinous Galerkin (DG) method as a time-stepping procedure for classical and fractional diffusion problems. After motivating the definition of the procedure, I outline its implementation and then illustrate key properties with simple, scalar ODEs and fractional ODEs. I then describe results for classical and fractional diffusion problems in 1D, and sketch an explanation for the observed superconvergence behaviour.</p>
<div>Bill McLean is an Associate Professor in the School of Mathematics and Statistics at UNSW. His research interests centre on numerical analysis for partial differential equations, and in particular on nonlocal evolution equations.</div>
<div> </div></div></div></section><div class="field field-name-field-seminar-latex field-type-text-long field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><div class="field field-name-field-seminar-url field-type-link-field field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Thu, 21 Mar 2019 07:43:33 +0000z33407774906 at https://www.maths.unsw.edu.auOn Emergence in Complex Physical Systems
https://www.maths.unsw.edu.au/seminars/2019-03/emergence-complex-physical-systems
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Peter Cudmore</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">University of Melbourne</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 28/03/2019 - 11:05am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-4082, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p class="western" style="line-height: 100%;">Many problems in biology, physics and engineering involve predicting and controlling complex systems, loosely defined as interconnected system-of-systems. Such systems can exhibit a variety of interesting non-equilibrium features such as emergence and phase transitions, which result from mutual interactions between nonlinear subsystems.</p>
<p class="western" style="line-height: 100%;">Modelling these systems is a task in-and-of itself, as systems can span many physical domains and evolve of multiple time scales. Nonetheless, one wishes to analyse the geometry of these models and relate both qualitative and quantitative insights back to the physical system.</p>
<p class="western" style="line-height: 100%;">Beginning with the modelling and analysis of a coupled optomechanical systems, this talk presents some recent results concerning the existence and stability of emergent oscillations. This forms the basis for a discussion of new directions in symbolic computational techniques for complex physical systems as a means to discuss emergence more generally.</p>
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<p class="western" style="line-height: 100%;">Peter Cudmore is a Postdoctoral Research Fellow in the Systems Biology Lab at University of Melbourne where he is developing and applying multi-physics network modelling techniques to biological systems. A key focus of his research is to understand the geometry of complex systems, and how emergence can be predicted, controlled. Peter completed his B.Sc. and Ph.D. (Applied Mathematics) at the University of Queensland.</p>
<p> </p></div></div></section><div class="field field-name-field-seminar-latex field-type-text-long field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><div class="field field-name-field-seminar-url field-type-link-field field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Wed, 27 Feb 2019 00:19:45 +0000z33407774892 at https://www.maths.unsw.edu.auUnraveling the thermohaline structure of the Southern Ocean using functional data analysis
https://www.maths.unsw.edu.au/seminars/2019-02/unraveling-thermohaline-structure-southern-ocean-using-functional-data-analysis
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Gurvan Madec</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">LOCEAN-IPSL, CNRS / Université P. et M. Curie, Paris, France</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Tue, 26/02/2019 - 3:05pm</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-4082, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><div>
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<p class="western" style="margin-bottom: 0.15in;" align="justify"><span style="font-family: Times New Roman;"><span style="font-size: large;">The Southern Ocean connects the Indian, Pacific and Atlantic Oceans and provides a direct pathway to exchange mass, heat and salt across the World Ocean, therefore playing an important role in the climate system. Due to the complexity of its structure and the general inadequacy of its sampling, both in time and space, it remains a challenge to describe and visualize the three dimensional pattern of its circulation and the associated tracer distribution (temperature, salinity, oxygen or nutrients). This work contributes to the understanding of the thermohaline structure of the ocean and especially of the Southern Ocean by introducing a novel decomposition method, the Functional Principal Component Analysis applied on combined T-S vertical profiles. We first normalize hydrographic profiles by using a functional spline representation and then, the statistical method of dimension reduction and feature extraction reveals the main spatial patterns of the T-S variations. Applied to the Southern Ocean, t</span></span><span style="font-family: Times;"><span style="font-size: large;">he first two modes explain ~92% of the combined T–S variance, thus providing a surprisingly good approximation of the thermohaline properties. T</span></span><span style="font-family: Times New Roman;"><span style="font-size: large;">he vertical modes present circumpolar patterns that can be closely related to the stratification regimes that define the circumpolar fronts. Notably the Polar Front is located at the natural boundary between the region controlled by the first (thermal) mode to the north and the second (haline) mode to the south. A mapping of the fundamental zonation is provided with an estimate of the width of the water mass boundaries. As a validation of this method, the Antarctic Polar Front is investigated further in the Indian sector using the same statistical framework. We show that the Polar Front latitudinal position varies seasonally upstream of the Kerguelen Plateau. This meandering is confirmed by hydrographic data gathered by elephant seals equipped with miniaturized sensors. Finally, the potential of the method is illustrated with an application to the World ocean where the first three vertical modes explain to 93% of the combined T-S variance and are related to very robust structures of the World Ocean. </span></span></p>
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</div></div></div></section><div class="field field-name-field-seminar-latex field-type-text-long field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><div class="field field-name-field-seminar-url field-type-link-field field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Wed, 20 Feb 2019 05:15:46 +0000z33407774872 at https://www.maths.unsw.edu.auA Topological Theory of Oceanic Neutral Surfaces
https://www.maths.unsw.edu.au/seminars/2019-03/topological-theory-oceanic-neutral-surfaces
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Geoff Stanley</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">School of Mathematics and Statistics, UNSW</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 07/03/2019 - 11:05am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-4082, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p class="western"> Most of the mixing in the ocean occurs along "neutral surfaces" rather than across them, but difficulties arising from nonlinearities in the density of seawater mean neutral surfaces can only be approximated. Here, a multivalued functional relationship between the pressure, p, and the density on neutral surfaces is exploited. Single-valued branches are found for geographic regions determined by the arcs of the Reeb graph of p. The regions meet at saddles of p which are represented by internal nodes of the Reeb graph, while leaf nodes represent extrema of p. Islands and other holes in the neutral surface can create cycles in the Reeb graph, raising some interesting new challenges. This topological theory also solves an open problem from 1989: the exact geostrophic stream function (GSF) for neutral surfaces is expressed using path integrals of this multivalued function. In practice, this theory gives rise to a new class of approximately neutral surfaces, called topobaric surfaces. These possess geographic dependence like neutral density while maintaining the exactness of a GSF like orthobaric density, two of the most advanced variables used in modern oceanography. The exact GSF for topobaric surfaces can be used effectively on any approximately neutral surface.</p>
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<p class="western"><span style="font-size: small;">Geoffrey J. Stanley is a postdoctoral fellow in the School of Mathematics and Statistics at UNSW. Presently, his research focuses on developing theory and algorithms for neutral surfaces in the ocean. His past research interests include Southern Ocean dynamics, flow around topography, the abyssal overturning circulation, and the transition to turbulence. In Physical Oceanography, he holds a PhD from the University of Oxford and an MSc from University of Victoria, as well as a BMath in Pure and Applied Mathematics from the University of Waterloo.</span></p>
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<p> </p></div></div></section><div class="field field-name-field-seminar-latex field-type-text-long field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><div class="field field-name-field-seminar-url field-type-link-field field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Wed, 20 Feb 2019 05:11:50 +0000z33407774871 at https://www.maths.unsw.edu.auUnion averaged operators with applications to proximal algorithms
https://www.maths.unsw.edu.au/seminars/2019-01/union-averaged-operators-applications-proximal-algorithms
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Minh N. Dao</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">CARMA, University of Newcastle</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 31/01/2019 - 2:05pm</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">M-032, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p style="margin-top: 0; margin-bottom: 0;"> </p>
<p style="margin-top: 0; margin-bottom: 0;">In this paper, we introduce and study a class of structured set-valued operators, which we call union averaged nonexpansive. At each point in their domain, the value of such an operator can be expressed as a finite union of single-valued averaged nonexpansive operators. We investigate various structural properties of the class and show, in particular, that is closed under taking unions, convex combinations, and compositions, and that their fixed point iterations are locally convergent around strong fixed points. We then systematically apply our results to analyze proximal algorithms in situations, where union averaged nonexpansive operators naturally arise. In particular, we consider the problem of minimizing the sum two functions, where the first is convex and the second can be expressed as the minimum of finitely many convex functions.</p>
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<p style="margin-top: 0; margin-bottom: 0;"><strong>Biography:</strong> Minh N. Dao received the Ph.D. degree in applied mathematics from the University of Toulouse, France in 2014. He was a Lecturer at Hanoi National University of Education, Vietnam from 2004 to 2010, a Lecturer and Research Assistant at National Institute of Applied Sciences (INSA) in Toulouse, France from 2013 to 2014, and a Postdoctoral Fellow at the University of British Columbia, Canada from 2014 to 2016. He is currently a Research Associate in the Priority Research Centre for Computer-Assisted Research Mathematics and its Applications (CARMA) at The University of Newcastle, Australia. His research interests include nonlinear optimization, nonsmooth analysis, iterative methods, monotone operator theory, control theory, and operations research. In 2017, he received the Annual Best Paper Award from the Journal of Global Optimization.</p></div></div></section><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Tue, 29 Jan 2019 05:56:37 +0000z33407774843 at https://www.maths.unsw.edu.auInter-ocean exchange of water through the atmosphere
https://www.maths.unsw.edu.au/seminars/2018-11/inter-ocean-exchange-water-through-%C2%A0atmosphere
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Prof. Kristofer Döös</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">Department of Meteorology, Stockholm University </div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 29/11/2018 - 11:00am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-2063, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p class="western" style="margin-bottom: 0in;">The freshwater cycle is traced as one integrated process in the ocean and atmosphere, not treating these as separated into two different systems. This has been done for both present and possible future climates. To accomplish this we have introduced a new method to calculate the water-mass transport from the region of evaporation to where it precipitates. The method is based on water-mass conservation in an Earth-System model and includes not only advection of moisture by the winds but also the vertical water-mass transport due to the precipitation. We have hence been able to close the oceanic overturning circulation and discovered a number of atmospheric hydrological cells, which are direct extensions of the oceanic overturning cells. The 3D water mass flux field is also used to trace the hydrological cycle with Lagrangian trajectories connecting the Pacific and Atlantic Oceans.</p>
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<p class="western" style="margin-bottom: 0in;">Kristofer Döös is a professor of climate modelling at the Department of Meteorology at Stockholm University since 1997.<br /> He has previously worked at Southampton Oceanography Centre and at the Institute of Oceanographic Sciences in the U.K.<br /> He has a PhD in oceanography from Université de Pierre et Marie Curie in Paris.<br /> His main research has been on ocean and climate numerical modelling with particular emphasis on the overturning circulation <br /> and the Lagrangian tracking of heat and water masses in both the ocean and atmosphere.</p>
<p class="western">He is currently a visting professor at the School of Mathematics and Statistics at UNSW until March 2019.</p></div></div></section><div class="field field-name-field-seminar-latex field-type-text-long field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><div class="field field-name-field-seminar-url field-type-link-field field-label-hidden view-mode-rss"><div class="field-items"><div class="field-item even"></div></div></div><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Mon, 19 Nov 2018 23:10:44 +0000z33407774797 at https://www.maths.unsw.edu.auBest approximation schemes for solving maximally monotone inclusion problems
https://www.maths.unsw.edu.au/seminars/2018-11/best-approximation-schemes-solving-maximally-monotone-inclusion-problems
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Ewa Malgorzata Bednarczuk</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">Systems Research Institute, Polish Academy of Sciences and Warsaw University of Technology, Faculty of Mathematics and Information Sciences</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Thu, 22/11/2018 - 10:30am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-2063, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p class="western" style="margin-left: 0.3in; line-height: 100%;"> </p>
<p>Ewa will discuss strongly convergent schemes with applications to convex optimization problems arising in image processing.</p>
<p>Professor at the Polish Academy of Sciences and the Warsaw University of Technology, main interests: variational analysis and optimization, recent research include: error bound property for vector-valued functions, differentiability of cone-convex vector-valued functions, variational principles, dynamical systems related to iterative schemes for solving maximally monotone inclusions. </p>
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<p> </p></div></div></section><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Tue, 13 Nov 2018 05:56:42 +0000z33407774793 at https://www.maths.unsw.edu.auObservational and Modeling Study of Ocean Circulation, Air-Sea Interaction, and Biogeochemical Processes in the Northwest Atlantic Coastal Ocean.
https://www.maths.unsw.edu.au/seminars/2018-11/effects-gulf-stream-and-storms-coastal-ocean-dynamics
<section class="field field-name-field-seminar-speaker field-type-text field-label-above view-mode-rss"><h2 class="field-label">Speaker: </h2><div class="field-items"><div class="field-item even">Dr Ruoying He</div></div></section><section class="field field-name-field-seminar-affiliation field-type-text field-label-above view-mode-rss"><h2 class="field-label">Affiliation: </h2><div class="field-items"><div class="field-item even">North Carolina State University, Dept. of Marine, Earth, and Atmospheric Sciences</div></div></section><section class="field field-name-field-seminar-date field-type-date field-label-above view-mode-rss"><h2 class="field-label">Date: </h2><div class="field-items"><div class="field-item even"><span class="date-display-single">Fri, 16/11/2018 - 11:00am</span></div></div></section><section class="field field-name-field-seminar-venue field-type-text field-label-above view-mode-rss"><h2 class="field-label">Venue: </h2><div class="field-items"><div class="field-item even">RC-4082, The Red Centre, UNSW</div></div></section><section class="field field-name-field-seminar-abstract field-type-text-long field-label-above view-mode-rss"><h2 class="field-label">Abstract: </h2><div class="field-items"><div class="field-item even"><p> </p>
<p><span style="color: #000000;"><span style="font-family: Arial;"><span style="font-size: medium;">Quantifying the coastal ocean response to climate changes requires us to first define the intrinsic coastal ocean variability on synoptic, seasonal and interannual time scales at the present time. Fundamental scientific questions to be addressed include: 1) what are the synoptic variability, seasonal characteristics, and interannual variations of coastal circulation; 2) what are the processes that lead to the large exchange of heat, salt, sediment, nutrient and carbon on the shelf; and 3) how does coastal circulation variability influence marine ecosystems? This talk will present some of findings and efforts carried out by Ocean Observing and Modeling Group at North Carolina State University using in situ observations and coupled numerical models to understand the western boundary coastal circulation dynamics, air-sea interaction, and biogeochemical processes in the northwest Atlantic Ocean.</span></span><span style="font-family: Arial;"><span style="font-size: medium;"><br /></span></span></span></p>
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<p><span style="color: #000000;"><span style="font-family: Arial;"><span style="font-size: medium;"><span style="background: #ffffff;">Dr. Ruoying He</span></span></span></span><span style="color: #000000;"><span style="font-family: Arial;"><span style="font-size: medium;"> is a Goodnight Innovation Distinguished Professor of North Carolina State University and an Adjunct Scientist of Woods Hole Oceanographic Institution. His research expertise spans from coastal circulation dynamics, air-sea interaction, to biophysical interactions. As the director of </span></span></span><a class="western" href="http://go.ncsu.edu/oomg"><span style="color: #000000;"><span style="font-family: Arial;"><span style="font-size: medium;"><span style="text-decoration: underline;">the Ocean Observing and Modeling Group</span></span></span></span></a><span style="color: #000000;"><span style="font-family: Arial;"><span style="font-size: medium;"> (OOMG), he conducts coastal ocean observations, remote sensing data analyses, and leads the development of prediction models of ocean circulation, air-sea-wave interactions, physical-biogeochemical couplings. Dr. He served as an Associated Editor for Journal of Geophysical Research-Oceans, and as a guest editor for Ocean Dynamics. He also serves on the editorial boards of several other scientific journals and on the organizing committees of several major international science meetings. He was the chair of Gordon Research Conference on Coastal Ocean Dynamics in 2017. He is presently also a member of NSF Ocean Observatories Initiative Facility Board, a member of US Integrated Ocean Observing System (IOOS) - National Modeling Steering Team, a member of National Academy of Sciences- Loop Current Study Committee, and a science team member of International GODAE OceanView project.</span></span></span></p>
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<p> </p></div></div></section><section class="field field-name-taxonomy-vocabulary-4 field-type-taxonomy-term-reference field-label-above view-mode-rss"><h2 class="field-label">School Seminar Series: </h2><ul class="field-items"><li class="field-item even"><a href="/category/school-seminar-series/applied-seminar">Applied Seminar</a></li></ul></section>Thu, 25 Oct 2018 05:10:45 +0000z33407774784 at https://www.maths.unsw.edu.au