NWO Cluster NDNS+

Workshops/Events

NDNS+ WORKSHOP IN TWENTE

On 25-26 June 2018 we organise a two days workshop in Twente. 

Program

Read the program in PDF

Abstracts

The number of participants is limited to 60. Therefore we  will apply the first-come-first serve policy. We are looking forward to an inspiring meeting. The cluster will pay for the local costs.

Studygroup Mathematics with Industry 2018

The 135th European Study Group Mathematics with Industry 2018 will be held in Eindhoven, January 29 - February 2, 2018.

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Date/location: January 29 - February 2, 2018, Eindhoven University of Technology, Eindhoven, The Netherlands

Since 1968, the Study Group Mathematics with Industry has brought together mathematicians and companies. Following the original Oxford model, about 60 mathematicians, ranging from PhD students to full professors, spend a week working on real life problems, presented to them by companies on Monday morning. During five busy days these problems are discussed, modelled, analysed, and computed, and results are presented on Friday. 

You are kindly invited to participate. Check our website 
http://www.swi-wiskunde.nl/swi2018/ for more information. 

Registration through the SWI 2018 website is compulsory due to capacity constraints. We can reimburse hotel costs for a limited number of participants.

GAMM-Workshop on Analysis of PDEs

Eindhoven University of Technology (TU/e)
27-29 September, 2017

GAMM, the Gesellschaft für Angewandte Mathematik und Mechanik (https://www.gamm-ev.de/index.php/) is an originally-German organization on the interface between mathematics and engineering - combining both applied mathematicians and theoretically-minded engineers.

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Eindhoven University of Technology (TU/e)
27-29 September, 2017

GAMM, the Gesellschaft für Angewandte Mathematik und Mechanik (https://www.gamm-ev.de/index.php/) is an originally-German organization on the interface between mathematics and engineering - combining both applied mathematicians and theoretically-minded engineers.

GAMM has ‘activity groups’ on a variety of topics, including the one behind this meeting, which is called Analysis of PDEs (http://www.uni-regensburg.de/Fakultaeten/nat_Fak_I/AnalysisPDG/index.html). This is the fourth meeting in this series of meetings of this activity group; the earlier ones were very interesting mid-size workshops, with about 50-70 participants, and with a nice degree of breadth versus focus. 

For the meeting in September we have an impressive lineup of speakers, including 

  • Gero Friesecke (TU Munich) 
  • Hermen Jan Hupkes (University of Leiden) 
  • Herbert Koch (University of Bonn) 
  • Christian Kuehn (TU Munich) 
  • Stephan Luckhaus (University of Leipzig) 
  • Alexander Mielke (WIAS Berlin) 
  • Felix Otto (MPI Leipzig) 
  • Matthias Roeger (TU Dortmund) 
  • Mark Veraar (TU Delft) 

In addition, we’ve asked a number of these to give a high-level, more philosophical talk on ‘where Analysis of PDEs is going’ - I think this will give some very interesting insight and discussion.

All are welcome to attend. If you plan to come, do please register at http://www.win.tue.nl/~otse/gamm-anapde2017/, so that we have an idea about the number of people coming.  

STAR Outreach day: Earthquake modelling and analysis

The next STAR Outreach Day will be held Friday April 22nd, at the Amsterdam Science Park Conference Halls. The topic is Earthquake modelling and analysis.

11:00 - 11.25 Arrival and coffee
11.25 - 11.30 Opening
11.30 - 12.15 Rick Schoenberg (UCLA)
On nonparametric estimation of Hawkes models for earthquakes
12.15 - 13.00 Marie-Colette van Lieshout (CWI/Twente)
Spatial regression analysis for induced earthquakes in the Groningen field.
13.00 - 14.00 Lunch

14.00 - 14.45 Jan Dirk Jansen (TU Delft)
TBA
14.45 - 15.15 Tea
15.15 - 16.00 Danijela Sijacic (TNO)
Statistics of earthquakes at the Groningen field.
16.00 - 16.30 Panel discussion
16.30 - 17.30 Closing and drinks

PhD days in analysis and dynamics, April 2016

On April 21 and 22, 2016, there will be a new edition of the yearly PhD days in analysis and dynamics, in Lunteren. This is a great venue for current PhD students to meet each other, and talk about each others' research. Apart from talks and posters on your own reseach, there are also always two invited speakers giving additional lectures.

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Background information

To foster future collaboration between graduate students in the field of mathematical analysis and dynamics we organise a two day meeting on the 21st and 22nd of April. Each participant is expected to give a short talk (10 mins, including questions) or a poster presentation about their current research. Apart from these talks, there will be two lectures by invited speakers. Furthermore, there will be two guest speakers, who will share their experience in working for a company after finishing their PhD. The speakers will be announced soon.

Website

See the PhD days website for up to date information.

Facebook

For future collaboration the participants will receive a facebook (it does not have anything to do with the popular social network). The booklet will contain photos, contact details and a short decription of the research field of each participant. The information 

will be requested during registration.

Registration

The registration form is available here. The deadline is 31st of March.

Contact information

For questions you can reach us by email: ndns.phddays@gmail.com

Organising committee

  • Claudiu Antonovici
  • Berry Bakker
  • Leonardo Morelli

Mini-workshop on symplectic geometry

On 12 March 2015 there will be a one-day workshop on symplectic geometry in Utrecht. This workshop is aimed at researchers, Ph.D. students, and advanced master's students working in symplectic geometry and related areas. It is organized jointly with the Vrije Universiteit Amsterdam.

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Universiteit Utrecht
March 12, 2015

This mini-workshop is aimed at researchers, Ph.D. students, and advanced master's students working in symplectic geometry and related areas. It is organized jointly with the Vrije Universiteit Amsterdam.

This is the first instance of what we plan to make a biannual tradition. Topics will include Hamiltonian dynamics, the symplectic embedding question, holomorphic curves, and Floer homology.

Speakers:

  • Kai Cieliebak (Universitaet Augsburg)
  • Felix Schlenk (Universite de Neuchatel)
  • Rob van der Vorst (Vrije Universiteit Amsterdam)
  • Frol Zapolski (University of Haifa)

Organizers:

  • Oliver Fabert (Vrije Universiteit Amsterdam)
  • Fabian Ziltener (Universiteit Utrecht)

Contacts:

  • Oliver Fabert, o.fabert ``at'' vu.nl
  • Fabian Ziltener, f.ziltener ``at'' uu.nl .

Website:

http://www.staff.science.uu.nl/~zilte001/symplectic_2015/index.php

Study Group Mathematics with Industry

Invitation 106th European Study Group Mathematics with Industry 2015, Utrecht
Date/location: January 26-30, 2015, Utrecht University, De Uithof, Utrecht, The Netherlands

Since 1968, the Study Group Mathematics with Industry has brought together mathematicians and companies. Following the original Oxford model, about 60 mathematicians, ranging from PhD students to full professors, spend a week working on one of six real life problems, presented to them on Monday morning. During four busy days these problems are discussed, dissected, modeled, analyzed, and computed, and results are presented on Friday.  

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Invitation 106th European Study Group Mathematics with Industry 2015, Utrecht
Date/location: January 26-30, 2015, Utrecht University, De Uithof, Utrecht, The Netherlands

Since 1968, the Study Group Mathematics with Industry has brought together mathematicians and companies. Following the original Oxford model, about 60 mathematicians, ranging from PhD students to full professors, spend a week working on one of six real life problems, presented to them on Monday morning. During four busy days these problems are discussed, dissected, modeled, analyzed, and computed, and results are presented on Friday.  

This year’s problems are posed by

  •  Philips: patient adaptive compressed sensing
  •  SKF: statistical modelling of mechanical bearing life testing
  •  KNMI: synchronizing numerical models of the atmosphere to improve weather and climate models
  • 3 more problems TBA

You are welcome to participate. See our website for the problems and more information, and also for registration:
http://www.projects.science.uu.nl/swi2015

Participation is free of charge. We can reimburse hotel costs for a limited number of participants.

Best regards,
The organizing committee of SWI 2015,
Rob Bisseling, Martin Bootsma, Jason Frank, Ross Kang (Nijmegen), Tobias Müller (chair), Sanjay Ramawadh, Alessandro Sbrizzi, Christian Spitoni, Paul Zegeling

Mathematics Institute
Utrecht University
PO Box 80010
3508 TA Utrecht
The Netherlands

For queries: swi2015uu@gmail.com

An algebraic view of dynamics

On the occasion of the 65th birthday of Jan Sanders, a workshop will be held at VU University Amsterdam:
An algebraic view of dynamics - Wed 16 and Thu 17 April 2014.

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On the occasion of the 65th birthday of Jan Sanders, a workshop will be held at VU University Amsterdam:

An algebraic view of dynamics - Wed 16 and Thu 17 April 2014.

Our speakers will be:

  • Frits Beukers (Utrecht)
  • Vincent Knibbeler (Newcastle)
  • Yuri Kuznetsov (Utrecht / Twente)
  • Alexander Mikhailov (Leeds)
  • James Murdock (Iowa State)
  • Vladimir Novikov (Loughborough)
  • André Vanderbauwhede (Gent) 
  • Ferdinand Verhulst (Utrecht)
  • Jing Ping Wang (Kent)

Details and registration information are available on our website: 
www.few.vu.nl/~brink/Jan65.html.

We hope to meet you at this workshop.

Best regards,
Sara Lombardo (Newcastle) and Bob Rink (Amsterdam)

PhD days in analysis and dynamics

We are happy to announce this year's NDNS+ meeting for PhD students in Analysis and Dynamics. The PhD Days in Analysis and Dynamics will take place on 24 and 25 April 2014 in Lunteren.

During this meeting we expect participants to introduce themselves and their research in the form of a poster or a short talk. Apart from these talks, two graduate level lectures will be delivered.

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We are happy to announce this year's NDNS+ meeting for PhD students in Analysis and Dynamics. The PhD Days in Analysis and Dynamics will take place on 24 and 25 April 2014 in Lunteren.

During this meeting we expect participants to introduce themselves and their research in the form of a poster or a short talk. Apart from these talks, two graduate level lectures will be delivered.

We believe that this is a good opportunity for PhD students to meet their fellow researchers, as well as possible future collaborators.

The event's webpage:
http://www.win.tue.nl/~tjong/phddays2014.html

The participation fee is free of charge, and includes one night's stay, breakfast, lunches and a conference dinner. Please see the website for more information and do not hesitate to contact us on phddays2014@gmail.com if you have any questions.

Best regards,
Gosse Overal, Björn de Rijk, KaYin Leung, Thomas de Jong, Bob Rink and Vivi Rottschafer

Mini-symposium Mathematics and Materials and defence Michiel Renger

On February 21, 2013, the PhD Defence of Michiel Renger will take place, and the lectures of:

  • Alexander Mielke (Weierstrass Institute for Applied Analysis and Stochastics, Institut für Mathematik Humboldt-Universität zu Berlin)
    Title:  “Using gradient structures for modeling semiconductors”
  • Johannes Zimmer (Department of Mathematical Sciences, University of Bath)
    Title: “Martensitic phase transitions: from microscopic waves to a macroscopic description”
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On February 21, 2013, the PhD Defence of Michiel Renger will take place, and the lectures of:

Alexander Mielke (Weierstrass Institute for Applied Analysis and Stochastics, Institut für Mathematik Humboldt-Universität zu Berlin<http://www.hu-berlin.de/> <http://www.hu-berlin.de/ )
13.15 hrs,  in Ceres 0.31
Title:  “Using gradient structures for modeling semiconductors”

Johannes Zimmer (Department of Mathematical Sciences, University of Bath)
14.00 hrs,  in Ceres 0.31
Title: “Martensitic phase transitions: from microscopic waves to a macroscopic description”

PhD Defence Michiel Renger
16.00 hrs, in Auditorium

========================================================================

Abstract Alexander Mielke:
“Using gradient structures for modeling semiconductors”

Many dissipative physical systems can be modeled via the Onsager principle which states that the rate of the state of a system is given in terms of a symmetric and positive definite matrix or operator applied to the associated thermodynamic driving force, which is obtained as derivative of the corresponding energy or entropy functional. In mathematical terms this leads to so-called gradient systems defined in terms of a functional and a dissipation potential.

We show that classical energy-drift-diffusion systems used for modeling of semiconductor devices can be written as gradient systems in the above sense. In the isothermal case the state is defined in terms of the densities of the relevant species and the functional is the relative entropy plus the electrostatic energy. In the temperature-dependent case the negative entropy acts as the functional, which is most easily described in as a function of the densities and the internal energy density. The Onsager operator consists of a Wasserstein part for the diffusion and a local part for the reactions.

We highlight how this modeling approach gives new understanding of critical issues in semiconductor physics, e.g. (i) proper modeling of different statistics (ii) drift enhancement (iii) including temperature effects (iv) modeling of active interfaces.

A. Mielke. A gradient structure for reaction-diffusion systems and for energy-drift-diffusion systems. Nonlinearity, 24: 1329-1346, 2011.

A.Glitzky and A. Mielke. A gradient structure for systems coupling reaction-diffusion effects in bulk and interfaces. Zeits. angew. Math. Physik, 2012, in press.  DOI: 10.1007/s00033-012-0207-y.

Abstract Johannes Zimmer:
“Martensitic phase transitions: from microscopic waves to a macroscopic description”

The equations of elasticity in one space dimension become ill-posed if the potential energy density is nonconvex, or equivalently if the stress-strain relationship is non-monotone. This complication necessarily arises in the theory of so-called martensitic phase transitions, which are diffusionless solid-solid transformations where several stable phases can coexist.

Different regularizations of this ill-posed problem have been proposed; but one line of thought is to impose instead selection criteria. In mechanical terms, such criteria relate the velocity of a moving interface to a driving force, and are often called kinetic relations. Phenomenological kinetic relations have been proposed, but a natural question is whether they can in simple situations be derived from first principles, namely atomistic considerations, thus from nonlocal models.

To investigate this question, we study a one-dimensional chain model of martensitic materials, where neighboring atoms are coupled by a spring characterised by a nonconvex potential. We present existence results for the associated nonlocal travelling wave equation and discuss non-uniqueness of microscopic solutions. This non-uniqueness will be discussed in light of the macroscopic kinetic relation.

Emergent dynamics of discrete and stochastic multiscale systems

An NDNS+ summer school will be held at 17-21 June 2013 at ICMS Advanced Study Center, Eindhoven University of Technology.

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This is the 1st announcement of the upcoming NDNS+ summer school
"Emergent dynamics of discrete and stochastic multiscale systems: analysis and simulation"
17.-21.6.2013 ICMS Advanced Study Center, Eindhoven University of Technology.

Following the successful 2010 winter and 2012 summer schools held at Universiteit Twente, this applied analysis summer school concerns emergent dynamics in multiscale systems of discrete particles and networks. The topics range from diffusion on networks, large deviations and active Brownian motions in random environments, to coarse-graining and molecular dynamics and computational statistical mechanics. The lectures will be complemented by guided problem sessions, which form a core part of the event.

Speakers:

  • Frank den Hollander (Leiden)
    "The parabolic Anderson equation"
  • Ben Leimkuhler (Edinburgh)
    "Molecular dynamics and the foundations of computational statistical mechanics"
  • Yamir Moreno (Zaragoza)
    "Networks: structure and diffusion dynamics"
  • Greg Pavliotis (London)
    "Coarse-graining techniques for deterministic and stochastic systems"

Registration deadline: 31.5.2013 (mandatory, via email to Mrs. Marese Wolfs secta@tue.nl)
No registration fees.
Accomodation is not included -- participants are asked to organize themselves. A list of hotels will be provided on the website.

URL: http://aacs.ewi.utwente.nl/AACS/Summerschool2013.html

PhD days in analysis and dynamics

Just like last year, a meeting for the NDNS+ PhD students will take place. This time too, the ``PhD days in Dynamics and Analysis'' will meet in woods of Lunteren (Veluwe) on 25th and 26th of April, 2012.

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Just like last year, a meeting for the NDNS+ PhD students will take place. This time too, the ``PhD days in Dynamics and Analysis'' will meet in woods of Lunteren (Veluwe) on 25th and 26th of April, 2013.

During this meeting we hope that participants will introduce themselves by giving a 10 to 15 minute talk on their research. Apart from these talks, two 90 minute graduate level lectures will be delivered. We believe that this is an excellent opportunity for PhD students to meet their fellow researchers, as well as possible future collaborators.

If you are a PhD student we would be very happy to see you at this meeting and if you have PhD students, we hope that you will especially encourage them to participate!

The cluster NDNS+ has been so kind to sponsor this meeting, so that participation is free of charge. It includes one night's stay, breakfast, lunches and a conference dinner. Please see our website http://www.few.vu.nl/~jwa470/phddays/ for more information and registration. Please do not hesitate to contact us if you have any questions.

Best regards,

PhD Days organizing committee:

Patrick Hafkenscheid
Corine Meerman
Eric Siero
Jagna Wiśniewska
Bob Rink
Vivi Rottschäfer

Darcy Lecture

The Darcy Lecture will be given by Prof. dr. Majid Hassanizadeh from Utrecht University, Department of Earth Sciences on "Capillarity in Porous Media, on Micro- and Macroscale, Revisited", on November 12, 2012, at the Eindhoven Multiscale Institute.

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Eindhoven Multiscale Institute Colloquium
Prof. dr. Majid Hassanizadeh
Utrecht University, Department of Earth Sciences

Darcy lecture:
“Capillarity in Porous Media, on Micro- and Macroscale, Revisited”

When: 12 November 2012

14:30-15:00 Coffee
15:00-16:00 Lecture
16:00-17:00 Drinks + discussion

Where: Ceres building, CE0.31, TU/e campus

Abstract:

In many soil and aquifer systems, one encounters simultaneous movements of two or more immiscible fluids. These systems are modeled using a modified form of Darcy’s law, mass or volume balance equations, and an empirical relationship between capillary pressure and saturation. In this lecture, Hassanizadeh will:

  • Explain the general understanding that capillary pressure is equal to the difference in pressures of two fluids. At microscale, this difference is given by the Young-Laplace equation, which prescribes an inverse relationship with the mean radius of curvature.
  • At macroscale, the difference in fluid pressures is assumed to be an algebraic empirical function of saturation, as mentioned above.
  • Provide a unifying approach to the theory of capillarity based on rational thermodynamics.
  • Present alternative definitions of capillary pressure on both micro- and macroscales. In particular, Hassanizadeh will make a clear distinction between capillary pressure and pressure difference of fluids.
  • Show that the difference in fluid pressures is a function of boundary conditions and dynamic properties of the system, such as flow rate or dynamic viscosities, based on theoretical, experimental, and computational results.
  • Propose that the capillary pressure must be an intrinsic property of the fluids/solid system and independent of dynamics of the system.
  • Introduce specific interfacial area (area of fluid/ fluid interfaces per unit volume of porous medium) as a new state variable to account for the fact that capillary pressure is a surface phenomenon and not a volumetric one.

Present theoretical, experimental, and computational evidences that show the empirical capillary pressure-saturation curve should be replaced with the capillary pressure-saturation-interfacial area surface rooted in thermodynamic theory.  

Stochastics and Nonlinear Dynamics in the Life Sciences

The stochastics cluster STAR and the nonlinear dynamics cluster NDNS+ are organizing an Outreach Day on the topic "Stochastics and Nonlinear Dynamics in the Life Sciences".  The workshop is open to all and free of charge, but please register.

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Event date:  Thu, 15/11/2012 - 10:00 - 17:00
Location:  CWI, Amsterdam

STAR/NDNS+ Outreach Day on

Stochastics and Nonlinear Dynamics in the Life Sciences at CWI, Amsterdam

The stochastics cluster STAR and the nonlinear dynamics cluster NDNS+ are organizing an Outreach Day on the topic "Stochastics and Nonlinear Dynamics in the Life Sciences".  The workshop is open to all and free of charge, but please register.

Invited speakers:

  • David Anderson (University of Wisconsin, Madison)
  • Willi J??ger (University of Heidelberg, tentative)
  • Frank Bruggeman (VU)
  • Odo Diekmann (UU)
  • Stephan van Gils (UTwente)
  • Alexander Sch??nhuth (CWI)
  • Ernst Wit (RUG)

Preliminary program:
https://www.cwi.nl/system/files/programme.pdf

Organizers:

  • Joke Blom
  • Michel Mandjes
  • Rob van der Mei

Contact:

For more information please contact Mrs. Nada Mitrovic.

Sponsors:

The workshop is made possible by the NWO mathematics clusters NDNS+ and STAR, and Centrum Wiskunde & Informatica.

Fluids and solids interacting over scales

Speakers: Prof. Willi Jäger, Prof. Andro Mikelić, Prof. Florin Radu 
Date:        Tuesday September 18, 2012 
Time:        09.00-12.00 hrs
Location:   Technische Universiteit Eindhoven, MF 02
Theme:      Fluids and solids interacting over scales

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09.00-09.45:  Prof. Willi Jäger (University of Heidelberg)

 Mathematical models for interactions of flow, chemical reactions and mechanics and applications in lifesciences 

In many applications it becomes necessary to couple reactive flow and mechanics of fluids and solids phases, leading to challenges of mathematical modeling and analysis. This lecture gives a survey on results obtain in the team in Heidelberg on dynamics of membranes and tissue, of processes in infarct and bone remodeling.

10.00-10.45: Prof. Andro Mikelić (Université Lyon)
 
Theory of the dynamic Biot-Allard equations and their link to the quasi-static Biot system
 
We undertake establishing well-posedness of the dynamic Biot-Allard equations. It is obtained using the precise properties of the dynamic permeability matrix following the homogenization derivation of the model.  By taking the singular limit of the contrast coefficient, the quasi-static Biot system can be obtained from the dynamic Biot equations. These results can be used to formulate an efficient computational algorithm for solving dynamic Biot-Allard equations for subsurface flows with the characteristic reservoir time scales larger than the  intrinsical characteristic time. This result appears to be completely new in the literature on Biot's theory. We conclude by showing that in the case of periodic deformable porous media the dynamic permeability has the required properties.
 
11.00-11.45: Prof. Florin Radu (University of Bergen)
 
Simulation of concrete carbonation by mixed finite elements
 
We discuss a prototypical reaction-diffusion-flow scenario in saturated/unsaturated porous media. The special features of our scenario are: the reaction produces water and therefore the flow and transport are coupled in both directions and moreover, the reaction may alter the microstructure. This means we have a variable porosity in our model. For the spatial discretization we propose a mass conservative scheme based on the mixed finite element method. The scheme is semi-implicit in time. Error estimates are obtained for some particular cases. We apply our finite element methodology for the case of concrete carbonation -- one of the most important physico-chemical processes affecting the durability of concrete.

Mini-symposium on dynamical systems

On Monday 27th of August there will be a mini-symposium on dynamical systems at the University of Utrecht.
Everyone interested is cordially invited!

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On Monday 27th of August there will be a mini-symposium on dynamical systems at the University of Utrecht.
Everyone interested is cordially invited!

The symposium is organized by Heinz Hanßmann and me at the occasion of my PhD defense in the afternoon on the same day. Please send me an email (reply to J.Eldering@uu.nl) to register for the lunch.

The speakers will be:

10:00-10:45h: Henk Broer   - Resonance and fractal geometry
11:15-12:00h: Odo Diekmann - Delay Equations
13:15-14:00h: Charles Pugh - Hölder foliations, revisited

For abstracts and more details, see:
http://www.staff.science.uu.nl/~elder104/DS-symposium.html

Symposium Eindhoven Multiscale Institute

The opening symposium of the Eindhoven Multiscale Institute will be held on October 24-26 2012 at TU Eindhoven. The Institute was founded early in 2012, and aims to bring together all multiscale science at the university to nucleate and facilitate scientific breakthroughs in this exciting field.

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The opening symposium of the Eindhoven Multiscale Institute will be held on October 24-26 2012 at TU Eindhoven. The Institute was founded early in 2012, and aims to bring together all multiscale science at the university to nucleate and facilitate scientific breakthroughs in this exciting field.

Confirmed speakers:

  • Peter Bolhuis (Amsterdam)
  • Wim Briels (Twente)
  • Jan Carmeliet (Zürich)
  • Weinan E (Princeton)
  • Erik van der Giessen (Groningen)
  • Martin van Hecke (Leiden)
  • Hans Kuipers (Eindhoven)
  • Andro Mikelic (Lyon)
  • Jan Nordbotten (Bergen/Princeton)
  • Alfio Quarteroni (Lausanne/Milan)
  • Karsten Reuter (München)
  • Steve Cowin (New York)

Special events:

  • On Wednesday 24th, at 16.00, the Rector will formally open the Institute, followed by drinks;
  • On Wednesday 24th, at 11.45, Prof. Alfio Quarteroni will hold a public lecture in the Studium Generale series;
  • On Friday afternoon we will organize two tours through TU/e laboratories.

More information at http://www.tue.nl/emi.

Recent Developments in the Solution of Indefinite Systems

A one-day workshop on April 17, 2012, at TU Eindhoven. This workshop brings together experts on the continuous and discrete formulation of saddle point problems from several areas of computational science, both for specific and general problems, and on efficient (parallel) solution techniques for the resulting systems of equations. This workshop will be useful both to researchers dealing with applications that give rise to saddle point problems and to developers of effective solution techniques for the resulting equations.

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The numerical approximation of several important scientific and engineering problems leads to block-structured indefinite linear systems in saddle point form. These problems arise in systems of PDEs with conservation laws, in constrained optimization problems, in mixed finite element discretizations, and in generalized least squares problems. Their efficient numerical solution is the subject of much research. The successful design of robust, scalable, and efficient preconditioners is intimately connected with an understanding of the structure of the resulting block matrix system, and relies heavily on exploiting this structure. Effective preconditioners are often based on an approximate block decomposition of the system that derives from a careful consideration of the spectral properties of the component block operators and the Schur complement operators. Through this purely algebraic view of preconditioning, a simplified system of block component equations is developed that encodes a specific "physics based" decomposition. Recent progress based on these ideas has led to the construction of a number of effective preconditioners with optimal or nearly optimal convergence rates for several applications. However, to compute accurate solutions to saddle point problems at a reasonable cost has proved difficult. As a consequence, a significant effort has been devoted to define proper formulations, discretizations, and fast solution methods for discretized saddle point problems and their generalizations.

This workshop brings together experts on the continuous and discrete formulation of saddle point problems from several areas of computational science, both for specific and general problems, and on efficient (parallel) solution techniques for the resulting systems of equations. This workshop will be useful both to researchers dealing with applications that give rise to saddle point problems and to developers of effective solution techniques for the resulting equations.

Micro and macro in systems of agents and particles

On April 18-20, 2012, a workshop will be held on Open problems between micro and macro in systems of agents and particles.

This workshop aims at bringing scientists from different fields together, around a common theme:  the transition from micro to macro scales in systems of particles, agents, dislocations, people, bacteria, animals - any system in which many microscopic elements conspire to create interesting effects at larger scales.

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This is to announce an informal ICMS workshop

Open problems between micro and macro in systems of agents and particles to be held at EURANDOM at TU Eindhoven, on April 18-20, 2012. 

This workshop aims at bringing scientists from different fields together, around a common theme:  the transition from micro to macro scales in systems of particles, agents, dislocations, people, bacteria, animals - any system in which many microscopic elements conspire to create interesting effects at larger scales. 

We have selected a group of top researchers with a broad variety of backgrounds, both in theory and experiment, to discuss different perspectives to the problems and the connections between those. The format will be special in that the focus lies on open problems rather than achieved results, and we will organize the meeting such as to optimize informal discussion. 

Confirmed speakers are:

  • Rinaldo Colombo (Brescia)
  • Gero Friesecke (Munich)
  • Florian Theil (Warwick)
  • Guy Theraulaz (Toulouse)
  • Edward Wilson (Southampton)
  • Alfons van Blaaderen (Utrecht)
  • Angela Stevens (Münster)
  • Stefan Zaefferer (Max-Planck-Institut für Eisenforschung Düsseldorf) 
  • Lorenzo Bertini (Rome)
  • Kees Weijer (Dundee)
  • Ronald van Katwijk (TNO Helmond)

The web page of the meeting is at:
http://www.tue.nl/workshopagentsandparticles

The meeting is open to everyone and participation is free; if you want to join us, please register by contacting Cindy Teuwissen, C.M.C.Teuwissen.Plompen@tue.nl, 040 2475704. 

Yours,

Mark Peletier,
Adrian Muntean,
Michiel Renger

Symposium on Delay equations

On Wednesday March 21 an NDNS+ symposium on Delay Equations takes place in the BBL building of Utrecht University.

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On Wednesday March 21 an NDNS+ symposium on Delay Equations takes place in the BBL building of Utrecht University, see http://www.cs.uu.nl/docs/reach/bbl.php

The program is as follows :

  • 10.00 - 10.45 Rossana Vermiglio (Udine)
    Numerical stability of delay equations
  • 10.45 - 11.15 Coffee/Tea
  • 11.15 - 12.00 Dimitri Breda (Udine)
    Computing Lyapunov exponents for systems with delay
  • 12.00 - 13.00 Lunch
  • 13.15 - 15.00  Seminar Spatio-Temporal Patterns
    see  http://www.staff.science.uu.nl/~kouzn101/SEMINAR/index.html
    (Both talks are concerned with delay equations.)
    Sid Visser (Twente)
    Analysis of a lumped model of neocortex to study epileptiform activity
    KaYin Leung (Utrecht)
    Spatial deterministic epidemics and the asymptotic speed of propagation
  • 15.30 - 16.00 Stephan van Gils (Twente)
    Neural field models as abstract delay equations
  • 16.15 - 17.00 Sebastiaan Janssens (Twente)
    A normalization technique for codimension two bifurcations of equilibria in delay equations

Lecture rooms :

  • 10-12 BBL 315/317
  • 13-15 BBL 071
  • 15-17 BBL 007

Everybody interested is cordially invited to attend.

Odo Diekmann  ( o.diekmann@uu.nl )

NDNS+ Workshops

Except the many workshops, lectures and seminars that are organized by the teams that participate in NDNS+, the NDNS+ cluster organizes approximately twice per year workshops related to its mission aimed at bringing together the members of the cluster and facilitate the communication between them. 

The following workshops have been organized

The following PhD courses have been organized: