mathLab innovating with mathematics
http://mathlab.sissa.it
enReduced Basis Approximations for Electromagnetic Applications
http://mathlab.sissa.it/reduced-basis-approximations-electromagnetic-applications
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-12-07T11:00:00+01:00">Wednesday, 7 December, 2016 - 11:00</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><strong>Speaker:</strong> Martin Hess (Former MPI Magdeburg and now post-doc at SISSA within the AROMA-CFD ERC project)</p>
<p><strong>Venue: </strong>Room 004, ground floor, SISSA main campus, Via Bonomea 265. Trieste</p>
<p><strong>Abstract:</strong></p>
<p>This talk deals with the application of the reduced basis method to microwave systems governed by time-harmonic Maxwell's equations. Several issues are adressed, such as rigorous error estimation, stability preservation and stability constant estimation. Additionally, model reduction results on a dispersive model of the Maxwell-Debye type are presented.</p>
<div> </div>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Tue, 06 Dec 2016 12:12:50 +0000giovannistabile347 at http://mathlab.sissa.itNumerical modelling and simulations of nonlinear elasto-plasticity for geodynamics applications
http://mathlab.sissa.it/numerical-modelling-and-simulations-nonlinear-elasto-plasticity-geodynamics-applications
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-12-12T17:30:00+01:00">Monday, 12 December, 2016 - 17:30</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><strong>Speaker:</strong> Mr Roberto Porcù, Politecnico di Milano, Department of Mathematics, MOX</p>
<p><strong>Room:</strong> A-005, SISSA Campus, Via Bonomea 265, Trieste</p>
<div><strong>Abstract:</strong></div>
<div class="rtejustify">The aim of this work is the numerical simulation of the Earth's lithosphere extension, with a particular focus on continental rifting that is a tectonical process which has a deep influence on other geodynamical phenomena and on the spatial distribution of some important natural resources. During last decades a large amount of research concerning this topic has been performed by means of analogical and numerical models, named sandboxes. This work is motivated by the observation of several issues inherent to the analogic experiments and by the generally accepted adoption, in the known literature, of purely linear rheologies for numerical tests, which are clearly incoherent with the natural finite-strain deformation regime of the problem at hand. In this work a fully-nonlinear elasto-plastic rheological approach has been developed and implemented. The variables of the problem are parametrized by material coordinates thus a totally-Lagrangian formulation has been adopted together with a quasi-static motion assumption justified by the analysis of the dimensionless quantities of the governing equations. In order to avoid the volumetric locking arising from the local strong enforcement of a nearly incompressible deformation, a three-fields weak variational formulation of the problem has been taken into account, as discussed in [Simo1998]: this method consists in the weak enforcement of the volumetric constraint by introduction of a new independent dilatation variable together with its dual variable that can be interpreted as the Kirchhoff pressure. This leads to an additive decomposition of the Helmoltz free energy into its isochoric and volumetric parts. Coherently to the fully-nonlinear rheological approach the deformation gradient is multiplicatively decomposed into its elastic and plastic parts, according to the Kroner-Lee decomposition. The global nonlinear system is solved by application</div>
<div class="rtejustify">of the Newton-Raphson linearization method. Then the constitutive update, which is computed point-wise on the quadrature nodes, is carried out firstly determining an elastic trial state; if the trial state is nonadmissible, the exponential return map algorithm is performed in order to recover admissibility. The nonlinear return map scheme is solved by means of the Newton-Raphson linearization method. A Drucker-Prager yield criterion and a non-associative flow rule have been considered since they represent really good choices for geological applications, as stated in [BelytschkoLiu2001]. A new C++</div>
<div class="rtejustify">MPI-parallel code has been implemented; it is based on the deal.II finite element library; it handles three-dimensional multi-layered domains. The results are encouraging since they show the natural development of V-shaped shear bands which is a deformation pattern that the most-diffused softwares in the geodynamics field are able to catch only if a weak seed is artificially added into the domain.</div>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Sat, 03 Dec 2016 21:04:33 +0000giovannistabile346 at http://mathlab.sissa.itDynamics and instability of free interface flows: applications to industrial processes
http://mathlab.sissa.it/dynamics-and-instability-free-interface-flows-applications-industrial-processes
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-12-12T18:15:00+01:00">Monday, 12 December, 2016 - 18:15</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><strong>Speaker</strong>: Dr Michele Girfoglio, University of Naples “Federico II"</p>
<div>
<div><strong>Room</strong>: A-005, SISSA Campus, Via Bonomea 265, Trieste</div>
<div> </div>
<div>
<div><strong>Abstract:</strong></div>
<div>
<div class="rtejustify">Free surface flows occur frequently in many industrial processes such as casting or injection. Within the framework of complex flows with liquid-gas free surfaces, the control of the break up of liquid jets (both plane and annular) plays a key role for the final quality of the product. Vertical liquid curtains are often used in technological processes, classical examples being coating technology and papermaking. In this talk, the unsteady global dynamics of a gravitational liquid sheet interacting with a one-sided adjacent air enclosure (commonly referred to as nappe oscillation configuration) will be addressed, under the assumptions of potential flow and presence of surface tension effects. It will be shown that the unsteady dynamics can be described by means of a typical integro-differential equation of hyperbolic type, exhibiting two distinct characteristic curves. An interesting re-formulation of the nappe global behavior as a driven damped spring-mass oscillator will be addressed. A relevant procedure, which has been employed in order to remove the singularity exhibited by the integro-differential operator for Weber number less than unit, will be presented. The investigation has been carried out by means of a modal (i.e., time asymptotic) linear approach, which is corroborated by direct numerical simulations of the governing equation. In the final part of the seminar it will be briefly illustrated the numerical investigation of a slag-steel interface surface in a continuous casting process.</div>
<div> </div>
</div>
</div>
<div> </div>
<div> </div>
</div>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Sat, 03 Dec 2016 20:59:13 +0000giovannistabile345 at http://mathlab.sissa.itNatural circulation with distributed heat sources: a theoretical and experimental investigation
http://mathlab.sissa.it/natural-circulation-distributed-heat-sources-theoretical-and-experimental-investigation
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-11-29T13:00:00+01:00">Tuesday, 29 November, 2016 - 13:00</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><strong>Speaker: </strong>Alessandro Pini (Politecnico di Milano, CESNEF )</p>
<p><strong>Venue: </strong>Room 005, ground floor, SISSA main campus, Via Bonomea 265. Trieste</p>
<p><strong>Abstract: </strong></p>
<p>The theme of the research concerns the dynamics of natural circulation loops with distributed heat sources. The dynamic behaviour of this kind of systems is investigated by means of both theoretical (1D/3D modal and non-modal methods) and experimental (ad hoc testing facility) approaches. The study attempts to provide a first systematic analysis of the dynamics of free convection in presence of distributed heating. Attention is paid to the prediction of stable and unstable (oscillating) flow regimes, whose occurrence is determined by several factors (e.g., geometry, heat-exchange features, piping material, and kind of heat source).</p>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Fri, 18 Nov 2016 12:47:04 +0000giovannistabile344 at http://mathlab.sissa.itOn aerodynamic design with a POD surrogate model
http://mathlab.sissa.it/aerodynamic-design-pod-surrogate-model
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-11-30T11:30:00+01:00">Wednesday, 30 November, 2016 - 11:30</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><strong>Speaker:</strong> Valentina Dolci (Politecnico di Torino)</p>
<p><strong>Venue: </strong>Room 005, ground floor, SISSA main campus, Via Bonomea 265. Trieste</p>
<p><strong>Abstract:</strong></p>
<p>Since the last few years, surrogate models are becoming a promising research field for engineering applications. A surrogate, or reduced-order model (ROM), is a mathematical tool able to extract the main features of a more computational demanding high-order model, starting from a reduced set of information. Once the surrogate model is built, it can be used to perform faster analyses of the problem. The fields of optimization and database generation in aerodynamics can be best candidates for the application of surrogate models. In the case of aerodynamic optimization, a cost function should be evaluated several times requiring many CFD simulations in order to achieve sufficient information to identify an optimum target. This operation requires a great amount of computational time and effort and the adoption of a surrogate model replacing the CFD high-order model can be attractive. However the construction of an accurate and robust surrogate model is a delicate process. Particular attention should be paid to the type of surrogate model chosen for a specific problem and to the number and position of the initial set of high-order simulations. In this construction phase there is a constant trade-off between required accuracy and computational effort reduction: the building of the surrogate model must be fast and not computational demanding preserving in the meantime the primary characteristics of the problem. In the present work surrogate models are constructed using the proper orthogonal decomposition technique applied in the parameter space. A reduced snapshot set is used, adopting full and fractional factorial planes together with quadtree distribution for the initial positioning of the snapshots. Response surface methodology is employed to compute the POD coefficients. Surrogate models are applied in the analysis of transonic flows, three-dimensional aircraft configurations and shape optimization of vehicles. A posteriori error estimates have been performed and the models showed good agreement with the CFD reference solution.</p>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Fri, 18 Nov 2016 11:17:03 +0000giovannistabile343 at http://mathlab.sissa.itConference: Recent developments in numerical methods for model reduction
http://mathlab.sissa.it/conference-recent-developments-numerical-methods-model-reduction
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><div class="date-display-range"><span class="date-display-start" property="dc:date" datatype="xsd:dateTime" content="2016-11-07T09:00:00+01:00">Monday, 7 November, 2016 - 09:00</span> to <span class="date-display-end" property="dc:date" datatype="xsd:dateTime" content="2016-11-10T17:15:00+01:00">Thursday, 10 November, 2016 - 17:15</span></div></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><strong>Venue:</strong> Paris, Institut Henri Poincaré<br /><strong>Organizers:</strong> T. Lelièvre, S. Perotto, G. Rozza<br /><strong>Conference website</strong> <a href="http://www.i3m.univ-montp2.fr/evenements/22-evenements/134-nmpdes">here</a><br /><strong>Programme</strong> <a href="http://www.math.univ-montp2.fr/~nmpdes/ME3-programme.pdf">here</a><br /><strong>Book of abstracts</strong> <a href="http://www.math.univ-montp2.fr/~nmpdes/IHP_ME3_NMPDES_bookOfAbstract.pdf">here</a></p>
<p><strong>Invited speakers:</strong></p>
<ul style="list-style-type:square"><li><strong>Francisco Chinesta </strong>(Ecole Centrale Nantes), Model order reduction in the factory of future: from data to knowledge</li>
<li><strong>Albert Cohen</strong> (Université Pierre et Marie Curie), Data assimilation, parameter estimation and reduced modeling</li>
<li><strong>Max Gunzburger</strong> (Florida State University), Reduced-order modeling for deterministic and stochastic anomalous diffusion problems</li>
<li><strong>Jan S. Hesthaven </strong>(Ecole Polytechnique Fédérale Lausanne), Reduced order models of Hamiltonian problems</li>
<li><strong>Traian Iliescu</strong> (Virginia Tech), Large Eddy Simulation Reduced Order Models</li>
<li><strong>Ioannis Kevrekidis </strong>(Princeton University), No equations, no variables: data, and the effective modeling of complex/multiscale systems</li>
<li><strong>Bijan Mohammadi </strong>(Université de Montpellier), Data Analytic Uncertainty Quantification Cascade in Optimization</li>
<li><strong>Mario Ohlberger </strong>(WWU Münster), Localized model reduction beyond offline-online splitting</li>
<li><strong>Anthony Patera </strong>(MIT), Model Order Reduction for Component-Based System Analysis</li>
<li><strong>Antonio Huerta</strong> (Universitat Politècnica de Catalunya), Generalized parametric solutions in Soktes flow and complex domains</li>
<li><strong>Serge Prudhomme </strong>(Polytechnique Montréal), On goal-oriented formulation for model reduction methods</li>
<li><strong>Kristoffer Van Der</strong> <strong>Zee </strong>(The University of Nottingham), Reduced-basis residual-minimization for parametrized PDEs in Banach-space settings</li>
<li><strong>Alessandro Veneziani </strong>(Emory University), Hierarchical Model Reduction techniques for hemodynamics: basics, isogeometric analysis, applications</li>
</ul></div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/workshop" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Workshop</a> </li>
</ul>
</div>
Sun, 13 Nov 2016 11:17:23 +0000giovannistabile342 at http://mathlab.sissa.itReduced order methods for parametric Von Karman equations in nonlinear structural mechanics.
http://mathlab.sissa.it/reduced-order-methods-parametric-von-karman-equations-nonlinear-structural-mechanics
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-11-16T16:30:00+01:00">Wednesday, 16 November, 2016 - 16:30</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><div><strong>Speaker</strong>: Federico Pichi (SISSA AMMA, formerly University of Rome, Sapienza)</div>
<div><strong>Venue</strong>: Big Meeting Room, 7th Floor, SISSAmain campus, Via Bonomea 265. Trieste</div>
<div> </div>
<div><strong>Abstract</strong>:</div>
<div class="rtejustify">We analyze the problem of the stability and buckling phenomena of a plate under compression along its edges. To do this we introduce the Von Karman equations, a system of two fourth-order, nonlinear and parametric equations. From the mathematical point of view the nonlinearity can be seen as a problem in bifurcation theory and can be showed that the bifurcation point is related with the y axis-crossing of the eigenvalues of the linearized problem. Because of the high computational cost we study this problem in the framework of Reduced Order Methods, specifically with Reduced Basis Method. We will show numerically the possible configurations that the plate could assume and their link with the eigenvalues. Finally we will characterize the possible existence of multiple bifurcation.</div>
<div> </div>
<div> </div>
<p> </p>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Mon, 07 Nov 2016 23:26:30 +0000giovannistabile341 at http://mathlab.sissa.itPOD-Galerkin Reduced Order Model for the simulation of laminar and turbulent flows around a circular cylinder
http://mathlab.sissa.it/pod-galerkin-reduced-order-model-simulation-laminar-and-turbulent-flows-around-circular-cylinder
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-11-16T16:30:00+01:00">Wednesday, 16 November, 2016 - 16:30</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><div><strong>Speaker</strong>: Saddam Hijazi (SISSA AMMA, formerly University of L’Aquila, MATHMODS)</div>
<div><strong>Venue</strong>: Big Meeting Room, 7th Floor, SISSA main campus, Via Bonomea 265. Trieste</div>
<div> </div>
<div><strong>Abstract:</strong></div>
<div>
<div class="rtejustify">In this talk the development of a Reduced Order Model (ROM) using a POD-Galerkin approach for the simulation of laminar and turbulent vortex-shedding flows around a circular cylinder is investigated. The Proper Orthogonal Decomposition (POD) is used to decompose the flow fields, derived from a high-fidelity finite volume approximation, into a set of spatial modes and temporal amplitudes. The POD approach permits to create spatial bases that are optimal in terms of energy, and a Galerkin projection of the governing equations onto the spatial-modes is performed in order to obtain a system of ordinary differential equations for the evolution of the time-dependent amplitudes. The projection is performed using the incompressible Navier-Stokes equations for the laminar case and incompressible Reynolds Averaged Navier-Stokes (RANS) equations for the turbulent case. The boundary conditions are enforced on the ROM using a penalty approach. The applicability and accuracy of the present method is studied and discussed for different values of the Reynolds numbers and for different phenomena used as benchmark test cases. </div>
<div> </div>
</div>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Mon, 07 Nov 2016 23:23:45 +0000giovannistabile340 at http://mathlab.sissa.itOn the use of a mixed formulation for the dynamics of rigid bodies in the framework of Lie-group geometric methods
http://mathlab.sissa.it/use-mixed-formulation-dynamics-rigid-bodies-framework-lie-group-geometric-methods
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><span class="date-display-single" property="dc:date" datatype="xsd:dateTime" content="2016-10-25T14:30:00+02:00">Tuesday, 25 October, 2016 - 14:30</span></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><strong>Speaker:</strong> Alessandro Giusti (University of Florence / TU Braunschweig)</p>
<p><strong>Room: </strong>SISSA - Santorio A - room 133</p>
<p><strong>Abstract:</strong></p>
<p>The dynamics of rigid bodies is presented by using a mixed vision of the motion that consists in the simultaneous use of two different bases. The motion of the reference point (usually the center of mass) is referred to the basis of the inertial frame whereas the motion about the reference point is referred to the rotating basis of the body-attached frame. The consequent set of differential equations is solved with an efficient Lie-group time integrator based on the so called geometric methods. In this framework, the formulation of non-follower and follower loads is developed including the special case of linear transformations of the state variables and the associated tangent operators, i.e. the linearization of the dynamic problem with respect to the state variables. The numerical model is tested on a series of dynamic problems for which the exact analytic solution is known, allowing a detailed assessment of the capability of the method. The possibility of truncating the tangent stiffness operator is discussed. The nonlinear dynamic model is then used for the study of moored floating platforms (buoyancy stabilized concept). Mooring line loads and hydrodynamic actions are considered as external loads related to the state variables, i.e. configuration of the body, velocity and acceleration. In particular, the mooring lines are modeled by a quasi-static theory while the hydrodynamic problem is solved in the linear wave theory framework. The effect of different strategies of simulation on the system response as well as the role of the main parameters affecting the motion is discussed.</p>
<p> </p>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/seminar" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Seminar</a> </li>
</ul>
</div>
Fri, 14 Oct 2016 11:40:35 +0000giovannistabile335 at http://mathlab.sissa.itQUIET 2017
http://mathlab.sissa.it/quiet-2017
<div class="section field field-name-field-date-events field-type-datestamp field-label-inline clearfix"><h3 class="field-label">Date: </h3><div class="field-items"><div class="field-item odd"><div class="date-display-range"><span class="date-display-start" property="dc:date" datatype="xsd:dateTime" content="2017-07-18T08:45:00+02:00">Tuesday, 18 July, 2017 - 08:45</span> to <span class="date-display-end" property="dc:date" datatype="xsd:dateTime" content="2017-07-21T16:30:00+02:00">Friday, 21 July, 2017 - 16:30</span></div></div></div></div><div class="section field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item odd" property="content:encoded"><p><a href="https://indico.sissa.it/event/8/">QUIET 2017</a> - Quantification of Uncertainty: Improving Efficiency and Technology - is focused on the review of recent algorithmic and mathematical advances and the development of new research directions for uncertainty quantification in the setting of partial differential equations with random inputs. As such, the workshop impacts the scientific, engineering,financial, economic, environmental, social, and commercial milieus.</p>
<div> </div>
</div></div></div>
<div class="field field-name-field-category field-type-taxonomy-term-reference field-label-above clearfix">
<p class="field-label">Category: </p>
<ul class="field-items">
<li class="field-item even">
<a href="/events/workshop" typeof="skos:Concept" property="rdfs:label skos:prefLabel" datatype="">Workshop</a> </li>
</ul>
</div>
Thu, 13 Oct 2016 13:54:15 +0000giovannistabile333 at http://mathlab.sissa.it