{"id":857,"date":"2021-02-24T23:04:10","date_gmt":"2021-02-24T20:04:10","guid":{"rendered":"https:\/\/ismma.ro\/?page_id=857"},"modified":"2026-03-31T22:05:08","modified_gmt":"2026-03-31T19:05:08","slug":"ismma-online-seminar","status":"publish","type":"page","link":"https:\/\/ismma.ro\/?page_id=857","title":{"rendered":"ISMMA Seminar"},"content":{"rendered":"<section class=\"l-section wpb_row height_medium\"><div class=\"l-section-h i-cf\"><div class=\"g-cols vc_row via_flex valign_top type_default stacking_default\"><div class=\"vc_col-sm-12 wpb_column vc_column_container\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column\"><div class=\"wpb_wrapper\"><p style=\"text-align: center;\"><strong><span style=\"color: #0000ff; font-size: 13pt;\"><em><br \/>\n<span class=\"title\">ISMMA SEMINAR<br \/>\n<\/span><\/em><\/span><\/strong><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, <span>April <\/span>21, 2026, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Existen\u021ba solu\u021biilor pentru interac\u021biuni fluid-structur\u0103 cu mai multe straturi \u2013 Dr. Claudiu M\u00eendril\u0103 (ISMMA)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:<\/span><span style=\"font-size: medium;\">Consider\u0103m un sistem de ecua\u021bii care modeleaz\u0103 un fluid incompresibil ce interac\u021bioneaz\u0103 cu un strat dublu format dintr-o membran\u0103 elastic\u0103 sub\u021bire \u0219i un strat elastic gros situat deasupra membranei. Astfel de sisteme apar \u00een modelarea s\u00e2ngelui interac\u021bion\u00e2nd cu artere.<br \/>\n<span>Voi discuta c\u00e2teva rezultate privind existen\u021ba solu\u021biilor pentru probleme periodice \u00een timp \u0219i cu valori ini\u021biale pentru sistemul de mai sus. Rezultatele au fost ob\u021binute \u00eempreun\u0103 cu Arnab Roy (BCAM, Bilbao) \u0219i Felix Brandt (Berkeley, California)<\/span>.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, <span>March <\/span>17, 2026, 12:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">On some monotonicity and comparison results for the p-torsional rigidity on convex domains \u2013 Prof. Cristian Enache (American University of Sharjah, United Arab Emirates)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">In this talk we present recent results concerning comparison and monotonicity properties for the p-torsional rigidity associated with convex domains. For an open and bounded convex set in Euclidean space and for any parameter p &gt; 1, the p-torsional rigidity is defined through the solution of the nonlinear torsion problem driven by the p-Laplacian operator. <\/span><br \/>\n<span style=\"font-size: medium;\">We introduce a normalized torsion functional with natural scale-invariant properties, which allows a precise geometric comparison between domains having different inradii. We prove that torsional rigidity values corresponding to two convex domains can be completely ordered through a sharp stability constant depending only on the dimension and on p. This provides the exact analogue, in the torsion setting, of classical comparison results known for the first Dirichlet eigenvalue of the p-Laplacian.<br \/>\nOur approach also yields Saint-Venant type inequalities and sharp monotonicity results for torsion-related quantities. We analyze asymptotic equality cases and describe the limiting regimes as p approaches 1 and infinity, linking the problem respectively to Cheeger-type quantities and to geometric characteristics involving the inradius and the average distance to the boundary. The sharpness of the results is illustrated through explicit model families of convex domains including rectangles, higher-dimensional orthotopes, ellipses and triangles.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, February 17, 2026, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Continuous flows driving branching processes \u2013 Dr. Catalin-Ioan Vrabie (ISMMA)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">In this talk we emphasize branching processes where the spatial motion is given by a continuous flow on the state space E. It turns out that if the branching mechanism is independent of the spatial variable then the branching process is obtained by introducing the branching in the time evolution of the flow on measures, canonically induced by the flow on E. We also present consequences of this representation in terms of the stochastic solutions of the associated nonlinear evolution equations. This presentation is based on joint work with Lucian Beznea.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, October 14, 2025, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Mathematical modeling of the dense avalanche onset on a surface with topography &#8211; Dr. Oana-Valeria Lupa\u0219cu-Stamate (ISMMA)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">The starting point is the limit load problem of a shallow flow of a viscoplastic fluid\/solid, with applications to the onset of dense avalanches with a small thickness on a basal surface with topography. The DVDS (Discontinuous Velocity Domain Splitting) method is used to reduce it to a shape optimisation problem (i.e. minimisation with respect to a subdomain). To solve the shape optimization problem, we introduce a numerical scheme based on a boundary variation method. Finally, we illustrate the proposed method with numerical simulations for academic and concrete problems using real geophysical data of the basal topography. These results are obtained jointly with Ioan R. Ionescu (Paris).<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\"><span>Thursday<\/span>, September 4, 2025, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Parabolic Hardy-H\u00e9non equations: qualitative theory and large time behavior &#8211; Dr. R\u0103zvan Gabriel Iag\u0103r (Universidad Rey Juan Carlos, Madrid, Spain)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:\u00a0<\/span><span style=\"font-size: medium;\"><span>This talk is focused on the mathematical theory of the parabolic Hardy-H\u00e9non equation with degenerate diffusion &#8230; [<a href=\"https:\/\/ismma.ro\/wp-content\/uploads\/2025\/08\/Abstract_Iagar_ISMMA_Sep25.pdf\" target=\"_blank\" rel=\"noopener\"><em>download abstract<\/em><\/a>]<\/span>.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\"><span>Tuesday<\/span>, May 6, 2025, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Model reduction with pole-zero placement and high order moment matching constraints for (data-driven) control design &#8211; <span><strong>CSII Dr. Tudor Ionescu (ISMMA)<\/strong><\/span><\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">\u00cen aceasta prezentare este formulat\u0103 si rezolvat\u0103 o problema de reduc\u021bie dimensional\u0103 prin egalare de momente cu constr\u00e2ngeri de poli-zerouri si momente de ordin superior, pentru reglare pe baza de model sau de date. Solutia problemei este ob\u021binut\u0103 prin rezolvarea unor ecua\u021bii matriceale Sylvester si a unui sistem liniar. De asemenea, este prezentat\u0103 si o solu\u021bie matriceala in formalism Loewner. Se demonstreaz\u0103, de asemenea, ca modelul ob\u021binut prin rezolvarea sistemului liniar este identic cu modelul cu matrice Loewner.<br \/>\nDe asemenea, matricele Loewner pot fi scrise direct din seturi de date, neimplicand existenta vreunui model cu ecua\u021bii diferen\u021biale sau cu functii de transfer. Se arat\u0103 pe un caz particular cum pot fi scrise matricele Loewner pentru un sistem cu mai multe comenzi si mai multe ie\u0219iri m\u0103surate cu constr\u00e2ngeri de poli. Se construie\u0219te modelul care corespunde datelor si care are polii fixa\u021bi in locurile dorite (din semiplanul complex stang). Construc\u021bia modelului din date, precum si controlul predictiv rezultat sunt ilustrate pe cazul unui generator sincron de putere, sistem neliniar cu trei intr\u0103ri \u0219i trei ie\u0219iri<span> (<a href=\"https:\/\/ismma.ro\/wp-content\/uploads\/2025\/05\/Seminar_6.05.pdf\" target=\"_blank\" rel=\"noopener\">download paper<\/a>)<\/span>.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\"><span>Tuesday<\/span>, April 8, 2025, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Mathematical modeling in the Soil-Plant-Atmosphere continuum Part II. Water erosion on vegetated surfaces &#8211; Dr. Stelian Ion (ISMMA)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:\u00a0<\/span><span style=\"font-size: medium;\"><span>The water circulation in the Soil-Plant-Atmosphere continuum and especially the water-induced soil erosion are issues of primary concern in the new era of climate change. Our goal is to provide a mathematical tool to &#8230; [<a href=\"https:\/\/ismma.ro\/wp-content\/uploads\/2025\/03\/abstract_sds_2025.pdf\" target=\"_blank\" rel=\"noopener\"><em>download abstract<\/em><\/a>]<\/span>.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, March 4, 2025, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Higher order methods: recent advances and open questions &#8211; CSI Dr. Ion Necoar\u0103 (ISMMA)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">Composite minimization involves a collection of functions which are aggregated in a nonsmooth manner. It covers, as particular cases, nonlinear least-squares, smooth approximation of minimax games, minimization of max-type functions, minimization problems with functional constraints and simple composite minimization problems, where the objective function has a nonsmooth component. We present a higher-order majorization-minimization algorithmic framework for such composite problems (possibly nonconvex). This framework replaces each component in the composite model with a higher-order surrogate such that the corresponding error function has a higher-order Lipschitz continuous derivative. Our algorithmic framework encompasses tensor methods, higher-order proximal methods and even higher-order Gauss-Newton type methods as particular algorithms. We present convergence guarantees (including rates) for these higher-order majorization-minimization algorithms in both convex and non-convex settings. Besides providing a general framework for the design and analysis of composite higher-order methods, in special cases, where complexity bounds are known for some particular (first-order) algorithms, our convergence results recover the existing bounds. Applications to non-linear least-squares (including phase retrieval), control, and functional constrained minimization are presented. Finally, some open questions related to higher-order optimization are discussed.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, February 4, 2025, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Mathematical modeling in the Soil-Plant-Atmosphere continuum Part I. Water flow on vegetated surfaces &#8211; Dr. \u0218tefan-Gicu Cruceanu (ISMMA)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\"><span>In this seminar we present an extended Saint-Venant system of partial differential equations (PDE) used as a mathematical tool to simulate and study the water flow over a soil surface with vegetation in a hydrographic basin. This model is based on &#8230; [<a href=\"https:\/\/ismma.ro\/wp-content\/uploads\/2025\/01\/Abs_sds_ismma2025.pdf\" target=\"_blank\" rel=\"noopener\"><em>download abstract<\/em><\/a>]<\/span>.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, November 26, 2024, 11:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Random multiple-fragmentation and flow of particles on a surface &#8211; Dr. Oana-Valeria Lupa\u0219cu-Stamate (ISMMA)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">We investigate stochastic fragmentation processes for particles with spatial position. The mathematical problem models the time evolution of a system of particles which move on an Euclidean surface driven by a given force (e.g., gravitational, fluid interaction, repulsion\/attraction), and split in fragments with smaller masses and velocities. We establish a multiple-fragmentation process and we solve the corresponding stochastic integro-differential equation. Finally, we present several numerical simulations of such processes. These results are obtained jointly with Lucian Beznea (Bucharest) and Ioan R. Ionescu (Paris).<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, April 16, 2024, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Numerical solution to the Dirichlet problem for linear parabolic SPDEs based on averaging over characteristics &#8211; <strong>Dr. Vasile Nicolae Stanciulescu<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">We consider SPDEs with deterministic coefficients which are smooth up to some order of regularity. We establish some theoretical results in terms of existence, uniqueness and regularity of the classical solution to the considered problem. Then, we provide the probabilistic representations (the averaging-over-characteristics formulas) of its solution. We, thereafter, construct numerical methods for it. The methods are based on the averaging-over-characteristics formula and the weak sense numerical integration of ordinary stochastic differential equations in bounded domains. Their orders of convergence in the mean-square sense and in the sense of almost sure convergence are obtained. The Monte Carlo technique is used in practical realization of the methods. Results of some numerical experiments are presented. The results are in agreement with the theoretical findings.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, March 14, 2024, 11:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Existence and boundedness of solutions to singular anisotropic elliptic equations &#8211; <strong>Dr. Florica C\u00e2rstea (University of Sydney, Australia)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">In this talk, we present new results on the existence and uniform boundedness of solutions for a general class of Dirichlet anisotropic elliptic problems &#8230; [<a href=\"https:\/\/ismma.ro\/wp-content\/uploads\/2024\/02\/FCirstea_abstract_2024.pdf\" target=\"_blank\" rel=\"noopener\"><em>download abstract<\/em><\/a>].<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, March 5, 2024, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Optimal control problems for a phase field model for tumor growth &#8211; <strong>Prof. Dr. Pierluigi Colli (University of Pavia, Italy)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: <\/span><span style=\"font-size: medium;\">A class of distributed optimal control problems, with deep quench approach and sparsity, is considered for a tumor growth model, which is of Cahn-Hilliard type and includes a term for chemotaxis. The evolution of the tumor fraction is governed by a pointwise inclusion involving the subdifferential of a double obstacle potential. The control and state variables are nonlinearly coupled and the cost functional contains a nondifferentiable term like the L1-norm in order to include sparsity effects. The so-called &#8222;deep quench approach&#8221; enables us to approximate the convex part of the double obstacle potential by functions of logarithmic type from the interior of the domain. This approximation is used to derive first-order optimality conditions also for the double obstacle case, by obtaining a variational inequality in terms of the associated adjoint state variables. Moreover, the sparsity results for the optimal controls are discussed. The talk reports on a joint research project with Andrea Signori and Juergen Sprekels.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, February 15, 2024, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Diffusion models and their applications in computer vision &#8211; <strong>CS Dr. Bogdan Alexe (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: Diffusion models are a new class of generative models that have shown outstanding performance in generating high-quality images, video, sound, text, etc. They are named for their similarity to the natural diffusion process in physics, which describes how molecules move from high-concentration to low-concentration areas. In the context of machine learning, diffusion models generate new data by reversing a diffusion process, i.e., information loss due to noise intervention. The main idea here is to add random noise to data and then undo the process to get the original data distribution from the noisy data. <\/span><span style=\"font-size: medium;\">The famous DALL-E 2 (from OpenAI), Midjourney, and open-source Stable Diffusion that create realistic images based on the user&#8217;s text input are all examples of diffusion models. In this talk I will explain how these diffusion models work and present some common applications in computer vision.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, December 19, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">A probabilistic numerical approach to the inverse Cauchy problem &#8211; <strong>CSIII Dr. Andreea Grecu (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: We introduce a probabilistic numerical approach for the reconstruction of the unknown boundary data of the steady state heat equation in a bounded domain in \u211d<sup><i>d<\/i><\/sup>, having discrete measurements inside the domain and on a part of the boundary. We shall provide theoretical results which reveal that our approach is designed to spectrally approximate the inverse operator that we deal with. Finally, a parallel algorithm shall be presented together with numerical experiments. This is based on a joint work with Iulian C\u00eempean and Liviu Marin.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, November 23, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Isolated singularities for nonlinear elliptic equations with Hardy potential &#8211; <strong>CSIII Dr. Maria F\u0103rc\u0103\u0219eanu (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: In this talk, we present results regarding the existence and behaviour near zero of solutions for some nonlinear elliptic equations with singular potentials. This is joint work with Florica C\u00eerstea. The presentation is partially supported by CNCS-UEFISCDI Grant No. PN-III-P1-1.1-PD-2021-0037.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, May 9, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Radial Efficiency Measures and Nonparametric Envelopment Estimators &#8211; <strong>CS Dr. Luiza Badin (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: The technical efficiency of economic producers can be interpreted as their ability to convert specific inputs of production process into desired outputs. The efficient production frontier can be defined as the locus of the maximal level of output that can be produced using a given level of input. If prices of inputs are available, one can consider a cost frontier determined by the minimal cost of producing a desired level of output. The technical efficiency of a particular producer is then determined by an appropriate measure of the distance between the geometrical point in the input-output space, that characterizes the producer, and the optimal frontier, where optimality is defined in terms of various economic assumptions.<br \/>\nIn practice, the attainable set and the shape of its boundaries are unknown, therefore the efficiency of a given producer is unknown. All these unknown quantities must be estimated based on a sample of observed producers. From a statistical point of view, this problem is related to the problem of estimating the support of a multivariate random variable, subject to various shape constraints induced by corresponding economic assumptions.<br \/>\nIn this presentation we summarize and discuss the most important statistical results available in the literature on nonparametric efficiency estimation.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, May 4, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Solu\u021bii periodice \u00een timp pentru interac\u021biunea unui fluid Newtonian cu o membran\u0103 elastic\u0103 &#8211; Drd. Claudiu M\u00eendril\u0103 (Charles Univ., Prague)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: Consider\u0103m un domeniu 3D m\u0103rginit \u0219i neted care con\u021bine un fluid Newtonian care verific\u0103 ecua\u021biile Navier-Stokes. O parte a frontierei domeniului are ata\u0219at\u0103 o membran\u0103 elastic\u0103 plat\u0103 care se poate mi\u0219ca doar \u00een direc\u021bie normal\u0103 , iar viteza membranei este egal\u0103 cu cea a fluidului de pe frontier\u0103. Sistemul con\u021bine \u0219i o for\u021bare extern\u0103 care este presupus\u0103 perodic\u0103 \u00een timp. Ar\u0103t\u0103m c\u0103 acest sistem admite (cel pu\u021bin) o solu\u021bie slab\u0103 periodic\u0103 \u00een timp dac\u0103 magnitudinea for\u021belor (\u00een norm\u0103 L^2) \u0219i a volumului domeniului \u00een timp este m\u0103rginit\u0103 de o anumit\u0103 constant\u0103 ce depinde doar de domeniu, perioada mi\u0219c\u0103rii, constante de material.<br \/>\nRezultatele au fost ob\u021binut \u00een colaborare cu S. Schwarzacher (Univ. Uppsala).<br \/>\n<\/span><\/p>\n<p style=\"padding-left: 60px; text-align: justify;\"><strong>Referin\u021be<\/strong>:<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ol>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/doi.org\/10.1137\/21M1458946\" target=\"_blank\" rel=\"nofollow noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/doi.org\/10.1137\/21M1458946&amp;source=gmail&amp;ust=1681455084411000&amp;usg=AOvVaw2tbNqu18J0KcbNL5I2qr8F\">Time-Periodic Weak Solutions for an Incompressible Newtonian Fluid Interacting with an Elastic Plate<\/a>, with\u00a0<a href=\"https:\/\/www2.karlin.mff.cuni.cz\/~schwarz\/\" target=\"_blank\" rel=\"nofollow noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/www2.karlin.mff.cuni.cz\/~schwarz\/&amp;source=gmail&amp;ust=1681455084411000&amp;usg=AOvVaw1rJS-qpyIsrFmKzAMX6Yqb\">S. Schwarzacher<\/a>, SIAM Journal on Math. Analysis, Vol. 54, Issue 4, (2022). D.O.I.:\u00a0<a href=\"https:\/\/doi.org\/10.1137\/21M1458946\" target=\"_blank\" rel=\"nofollow noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/doi.org\/10.1137\/21M1458946&amp;source=gmail&amp;ust=1681455084411000&amp;usg=AOvVaw2tbNqu18J0KcbNL5I2qr8F\">https:\/\/doi.org\/10.<wbr \/>1137\/21M1458946<\/a>\u00a0disponibil\u00a0\u00a0\u00a0\u0219<wbr \/>i la\u00a0<a href=\"https:\/\/arxiv.org\/abs\/2111.06239v2\" target=\"_blank\" rel=\"nofollow noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/arxiv.org\/abs\/2111.06239v2&amp;source=gmail&amp;ust=1681455084411000&amp;usg=AOvVaw2LTlnWmz8dlmO0qM-_-8wP\">https:\/\/arxiv.org\/abs\/2111.<wbr \/>06239v2<\/a><\/li>\n<li style=\"text-align: justify;\">Time-periodic weak solutions for the interaction of an incompressible fluid with a linear Koiter type shell under dynamic pressure boundary conditions, with \u00a0<a href=\"https:\/\/www2.karlin.mff.cuni.cz\/~schwarz\/\" target=\"_blank\" rel=\"nofollow noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/www2.karlin.mff.cuni.cz\/~schwarz\/&amp;source=gmail&amp;ust=1681455084411000&amp;usg=AOvVaw1rJS-qpyIsrFmKzAMX6Yqb\">S. Schwarzacher<\/a>,\u00a0\u00a0disponibil\u00a0\u00a0\u00a0\u0219i la\u00a0<a href=\"https:\/\/arxiv.org\/abs\/2303.13625\" target=\"_blank\" rel=\"nofollow noopener\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/arxiv.org\/abs\/2303.13625&amp;source=gmail&amp;ust=1681455084411000&amp;usg=AOvVaw3XSVQ7b9HTLIJ15mNGSrmf\">https:\/\/arxiv.org\/abs\/2303.<wbr \/>13625<\/a><\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, April 6, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">On some nonlinear PDE&#8217;s with relevance in economics &#8211;\u00a0<strong>CSI Dr. Gabriel Eduard V\u00eelcu (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: The Monge-Amp\u00e8re equation is a nonlinear second-order partial differential equation that arises in a natural way in differential geometry and has applications to production models in economics. On the other hand, the constant elasticity of substitution (CES for short) is a basic property widely used in some areas of economics that involves a system of second-order nonlinear partial differential equations (called the CES system). We construct the exact solutions for the Monge-Amp\u00e8re equation and CES system under some special conditions. Several open problems are also discussed.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, March 28, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Principii de maximum pentru P-func\u021bii \u0219i aplica\u021bii &#8211; Dr. <strong>Cristian Enache (American University of Sharjah, Emiratele Arabe Unite)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: \u00cen aceast\u0103 prezentare vom analiza o serie de rezultate privind principiile de maxim pentru <em>P<\/em>-func\u021bii \u0219i aplica\u021biile lor \u00een studiul ecua\u021biilor cu derivate par\u021biale. Mai precis, vom ar\u0103ta cum pot fi folosite astfel de principii de maxim \u00een probleme de interes fizic sau geometric, pentru a ob\u021bine diferite estim\u0103ri a priori, inegalit\u0103\u021bi izoperimetrice, rezultate de simetrie, rezultate de convexitate, forma unor frontiere libere \u0219i rezultate de tip Liouville.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, March 14 and April 11, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">The security of online activities &#8211; Dr. <strong>Silviu-Lauren\u021biu Vasile (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: In our daily activities we constantly interact with series of on-line services which may suppose also a different set of vulnerabilities from the perspective of shared information&#8217;s. Common things such as email, wireless network, authentication, authorization can hide a list of technical notions that I will point out in this presentation. I will describe some technical aspects that can be useful in identifying spam messages, checking security of a connection or a malicious site. In the end, I will recommend some measures that may be useful to limit exposure on the Internet.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, March 7, 2023, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Asymptotic behaviour of a one-dimensional avalanche model through a particular stochastic process &#8211; Dr. <strong>Oana-Valeria Lupa\u0219cu-Stamate (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: We develop the study of a binary coagulation-fragmentation equation which describes the avalanches phenomena. We construct \ufb01rst an adapted stochastic process and obtain its behaviour to the equilibrium. Our model is based on self-organized critical (SOC) systems and in particular on a simple sand pile model. Furthermore, we de\ufb01ne a stochastic di\ufb00erential equation for this process and propose a numerical method in order to approximate the solution. The key point of our work is a new interpretation of the avalanches phenomena by handling stochastic di\ufb00erential equations with jumps and the analysis of the in-variant behaviour of the stochastic process. The results are obtained jointly with M\u0103d\u0103lina Deaconu (Nancy).<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, December 20, 2022, 11:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Problema de control H<sub>\u221e<\/sub> pentru sisteme parabolice liniare &#8211; Dr. <strong>Gabriela Marinoschi (ISMMA)<\/strong><br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: Se prezint\u0103 cadrul general al problemei de stabilizare H<sub>\u221e<\/sub> cu control feedback \u00een spa\u021bii infinit dimensionale pentru probleme parabolice. Se rezolv\u0103 o problema de control H<sub>\u221e<\/sub> pentru o ecua\u021bie parabolic\u0103 liniar\u0103 singular\u0103.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, November 15, 2022, 11:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">A modified SIR model for Covid-19 spread prediction using neural networks &#8211; Drd. Marian Petrica<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: We propose an analysis in three stages of Covid19 spread prediction. The first stage is based on the classical SIR model which we do using a neural network. This provides a first set of daily parameters. In the second stage we propose a refinement of the SIR model in which we separate the deceased into a distinct category. By using the first estimate and a grid search, we give a daily estimation of the parameters. The third stage is used to define a notion of turning points (local extremes) for the parameters. We call a regime the time between these points. We outline a general way based on time varying parameters of SIRD to make predictions.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, November 3, 2022, 11:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Ecua\u021bii eliptice cu coeficien\u021bi variabile aleatoare &#8211; Prof. Victor Nistor (Institut \u00c9lie Cartan de Lorraine, Metz, Fran\u021ba)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><span style=\"text-decoration: underline;\"><a href=\"https:\/\/ismma.ro\/wp-content\/uploads\/2022\/10\/Abstract-V-Nistor.pdf\" target=\"_blank\" rel=\"noopener\"><strong>Abstract<\/strong><\/a><\/span>: In prezentarea mea, voi considera o ecuatie eliptica de forma <em>\u2211<sub>i;j<\/sub> \u2202<sub>i<\/sub>(a<sub>ij<\/sub>\u2202<sub>j<\/sub>u) = f<\/em> (si generalizari ale ei). In practica, coeficientii <em>a<sub>ij<\/sub><\/em> adesea reprezinta proprietati ale materialelor constitutive. Aceste proprietati nu sunt intotdeauna cunoscute cu exactitate. Din aceasta cauza este important ca acesti coeficienti <em>a<sub>ij<\/sub><\/em> sa fie considerati ca variabile aleatoare. Rezultatul principal este ca daca acesti coeficienti urmeaza o lege log-normala, atunci norma solutiei <em>u<\/em> intr-un spatiu Sobolev <em>H<sup>k<\/sup><\/em> este in toate spatiile <em>L<sup>p<\/sup><\/em>, <em>p&lt;\u221e<\/em>, ca variabila aleatoare.<br \/>\nColaborare cu M. Kohr, S. Labrunie si H. Mohsen.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: circle;\">\n<li><em><strong style=\"font-size: medium;\">Seminarul va avea loc on-site, \u00een sala &#8222;Octav Onicescu&#8221;, etaj 4, sala nr. 4331.<br \/>\n<\/strong><\/em><\/li>\n<\/ul>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, October 25, 2022, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">O scurta introducere \u00een machine learning &#8211; Drd. Vlad Raul Constantinescu<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: O sa \u00eencepem prin a defini problema de \u00eenv\u0103\u021bare automat\u0103. Vom prezenta ce metode numerice se folosesc pentru antrenarea algoritmilor de machine learning \u0219i ce rezultate de convergen\u021b\u0103 exist\u0103 \u00een literatur\u0103. \u0218i \u00een final vom explica ce este o re\u021bea neuronal\u0103 \u0219i care sunt problemele deschise \u00een zona de deep learning.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: circle;\">\n<li><em><strong style=\"font-size: medium;\">Seminarul va avea loc on-site, \u00een sala &#8222;Octav Onicescu&#8221;, etaj 4, sala nr. 4331.<br \/>\n<\/strong><\/em><\/li>\n<\/ul>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, March 24, 2022, 10:00 AM<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">The Schrodinger equation on quantum metric graphs &#8211; Dr. Andreea Grecu<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: We discuss dispersive properties and Hardy uncertainty principle for the linear Schrodinger equation on quantum metric graphs, together with some well-posedness results for the nonlinear equation, in the deterministic case and with random and white noise dispersion.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, June 29, 2021<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Mathematica presentation at Institute of Mathematical Statistics and Applied Mathematics &#8211; Jon Mcloone (Wolfram)<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Description<\/strong>: Find out how you can leverage our ready-to-use data, powerful statistical analysis tools and state-of-the-art symbolic and numerical computation to elevate your workflow. The presentation will focus on Mathematica latest features, numeric and symbolic computation, solving ODE, PDE, optimisation, statistics. A Q&amp;A session will also take place with Jon Mcloone, who is a certified Instructor and the Director of Technical Services, Communication and Strategy at Wolfram.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Monday, May 10, 2021<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">On the stochastic orders of two multivariate distributions families &#8211; Drd. Luigi Catan\u0103<br \/>\n<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: We present the results obtained on the stochastic orders for two families of multivariate distributions: the uniform distribution on a convex set and a type of Pareto distribution proposed by Mardia.<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, April 13, 2021<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Time-domain moment matching for nonlinear dynamical systems of ODEs &#8211; Something to compute&#8230; &#8211; Dr. Tudor Ionescu (ISMMA)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>: For nonlinear systems, high dimension and complexity are two major issues in dealing with models suitable for (nonlinear) analysis, simulation and control. Even if the high dimension is reduced, complexity may increase as opposed to linear systems where these notions are identical. Therefore, suitable model reduction is called for. This has been studied recently in the time-domain moment matching framework, where suitable notions of moment have been introduced and families of parameterized reduced order models have been developed. The degrees of freedom are used to enforce\/preserve properties or topology, increase accuracy, etc. Same ideas apply to the case of infinite-dimensional systems such as, e.g., time-delayed systems, PDE-based models, etc. where families of finite-dimensional systems can be achieved based on moment matching (<a href=\"https:\/\/ismma.ro\/wp-content\/uploads\/2021\/04\/Seminar_13.04.pdf\" target=\"_blank\" rel=\"noopener\">download paper<\/a>).<br \/>\n<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, March 4, 2021<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Asupra unei ecua\u0163ii neliniare de evolu\u0163ie \u00eentr-un spa\u0163iu abstract de st\u0103ri \u00een sensul lui Davies &#8211; Dr. Cecil Pompiliu Grunfeld (ISMMA)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Rezumat<\/strong>: Rezultate recente privind existen\u0163a \u015fi unicitatea solu\u0163iilor globale \u00een timp ale problemei Cauchy pentru o ecua\u0163ie neliniara de evolu\u0163ie, formulat\u0103 \u00eentr-un spa\u0163iu abstract de st\u0103ri \u00een sensul lui Davies (spa\u0163iu Banach ordonat real, cu norma aditiv\u0103 pe conul pozitiv) sunt prezentate \u00een contextul aplic\u0103rii la modele neliniare de evolu\u0163ie, specifice mecanicii cuantice.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, July 9, 2019<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Phase-field modeling of prostate cancer growth and treatments &#8211; Guillermo Lorenzo (Computational Mechanics &amp; Advanced Materials Group, Department of Civil Engineering and Architecture, University of Pavia, Italy)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:\u00a0Prostate cancer is a major health problem among aging men worldwide. Nowadays, most cases are detected and treated at an early stage, when the tumor is still localized within the prostate. However, the limited individualization of the clinical management of this disease has led to significant overtreatment, which may cause adverse side-effects and reduce the patient\u2019s quality of life. Moreover, current diagnostic methods may underestimate tumor aggressiveness, which may hence survive the prescribed treatment and compromise the patient\u2019s life expectancy. Mathematical oncology is a new trend that can contribute to overcome these issues. This approach relies on the use of mathematical models and computer simulations to predict clinical outcomes and design optimal treatments on a patient-specific basis. In this context, I will present mathematical models to describe the evolution of organ-confined prostatic tumors based on key mechanisms and I will show relevant simulations both in experimental setups and organ-scale, patient-specific scenarios. As the development of this disease can be interpreted as an evolving interface problem between healthy and tumoral tissue, these models are based on the phase-field method to account for the coupled dynamics of both tissues. Isogeometric analysis permits to accurately and efficiently address the nonlinearity of the models, the complex anatomy of the prostate, and the intricate tumoral morphologies. The mathematical models and isogeometric methods presented herein provide a patient-specific computational framework to forecast prostate cancer evolution at organ scale, investigate the mechanisms of prostatic tumor growth, and explore optimal treatment strategies.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, July 9, 2019<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Optimal control for a prostate tumor growth model &#8211; Gabriela Marinoschi (ISMMA)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:\u00a0We present a phase-field type model consisting of three equations, one accounting for the healthy to tumoral cell transition described by an order parameter, coupled with the equation for the variation of the nutrient. The third equation expresses the evolution of the prostate-specific antigen (PSA) influenced by the order parameter and nutrient concentration. The purpose is to control this system via the nutrient source and a treatment scheme such that to meet some objectives, especially the decrease of the tumor.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Tuesday, February 19, 2019<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">BEM-CGM algorithms for inverse boundary value problems in 2D steady-state anisotropic heat conduction &#8211; Liviu Marin (University of Bucharest and ISMMA)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:\u00a0We investigate the numerical reconstruction of the missing thermal boundary conditions on an inaccessible part of the boundary in the case of steady-state heat conduction in anisotropic solids from the knowledge of over-prescribed noisy data on the remaining accessible boundary. This inverse boundary value problem is approached by employing a variational formulation which transforms it into an equivalent control problem. Four such approaches are presented and both a parameter-dependent and a parameter independent gradient based algorithms are obtained in each case. The numerical implementation is realized for the 2D case by employing the boundary element method (BEM) and assuming that the available boundary data are either exact or noisy. For perturbed Cauchy data the numerical solution is stabilized\/regularised by stopping the iterative procedure according to Morozov&#8217;s discrepancy principle.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, March 29, 2018<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">Rolul inegalitatilor de tip Hardy \u00een teoria spatiilor de functii &#8211; Petru Mironescu (University Claude Bernard Lyon, France)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:\u00a0\u00cen prima parte, voi ilustra rolul fundamental al inegalit\u0103\u021bilor lui Hardy \u00een teoria spa\u021biilor de func\u021bii prin dou\u0103 exemple de baz\u0103: calculul func\u021bional \u00een spa\u021biile Sobolev \u0219i teoria spa\u021biilor Sobolev cu ponderi. \u00cen partea a doua, voi prezenta aplica\u021bii ale acestor teorii la studiul func\u021biilor Sobolev unimodulare.<\/span><\/p>\n<ul style=\"list-style-type: square;\">\n<li><span style=\"font-size: medium;\"><strong><span style=\"color: #0000ff;\">Thursday, October 19, 2017<\/span><\/strong>:<br \/>\n<em><strong style=\"font-size: medium;\">An inverse problem for a semilinear parabolic equation arising from cardiac electrophysiology &#8211; Cecilia Cavaterra (University of Milan, Italy)<\/strong><\/em><\/span><\/li>\n<\/ul>\n<p style=\"padding-left: 60px; text-align: justify;\"><span style=\"font-size: medium;\"><strong>Abstract<\/strong>:\u00a0We considered an inverse boundary value problem for the monodomain equation, which describes the evolution of the electric potential in the heart tissue. The goal is the determination of a small inhomogeneity inside the domain occupied by the heart from observations of the potential on the boundary. Such a problem is related to the detection of myocardial ischemic regions, characterized by severely reduced blood perfusion and consequent lack of electric conductivity. Both theoretical analysis and numerical reconstruction techniques are developed.<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/section>\n","protected":false},"excerpt":{"rendered":"ISMMA SEMINAR Tuesday, April 21, 2026, 10:00 AM: Existen\u021ba solu\u021biilor pentru interac\u021biuni fluid-structur\u0103 cu mai multe straturi \u2013 Dr. Claudiu M\u00eendril\u0103 (ISMMA) Abstract:Consider\u0103m un sistem de ecua\u021bii care modeleaz\u0103 un fluid incompresibil ce interac\u021bioneaz\u0103 cu un strat dublu format dintr-o membran\u0103 elastic\u0103 sub\u021bire \u0219i un strat elastic gros situat deasupra membranei. Astfel de sisteme apar...","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-857","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ismma.ro\/index.php?rest_route=\/wp\/v2\/pages\/857","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ismma.ro\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ismma.ro\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ismma.ro\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ismma.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=857"}],"version-history":[{"count":72,"href":"https:\/\/ismma.ro\/index.php?rest_route=\/wp\/v2\/pages\/857\/revisions"}],"predecessor-version":[{"id":2362,"href":"https:\/\/ismma.ro\/index.php?rest_route=\/wp\/v2\/pages\/857\/revisions\/2362"}],"wp:attachment":[{"href":"https:\/\/ismma.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}