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Sistemų analizės seminaras

Pirmadienį (gruodžio 5 d.) 13 val. 203 kab. (Akademijos g. 4) sistemų analizės seminare doktorantūros studijų rezultatus pristatys Arnoldas Budžys „Anomalinių įvykių identifikavimas ir jų užkardymas kompiuterių tinkluose taikant mašininio mokymosi metodus“.

Vadovas – dr. Viktor Medvedev.

Kviečiame dalyvauti! (https://bit.ly/3XP1ort)

2022-12-02

Fudan International Seminar on Analysis, PDEs and Fluid mechanics

The speaker: Professor Eduard Marušić-Paloka (University of Zagreb, Croatia)

Title of the talk:  “Mathematical model of heat transfer through a conductive pipe”.

Time: Thursday, 1 of December, 15:00 - 16:00.

Abstract: The standard engineer's model for heat transfer between the fluid flowing through the pipe and the exterior medium neglects the effects of the pipe's wall. The goal of this paper is to prove that they are not always negligible. Comparing the ratio between diffusivities of the fluid and the wall with the wall's thickness, using rigorous asymptotic analysis, we find five different models for effective description of the heat exchange process


ZOOM link:

https://us02web.zoom.us/j/83673138944?pwd=azQyc1BwUjJFY3VjMStLbFR5Z2VwUT09

ZOOM Id: 836 7313 8944

Passcode: 808818

We are pleased to inform you that the information on previous talks is available on the seminar web page https://researchseminars.org/seminar/Cafe_Analysis_and_Fluid. See Past Talks section.

We sincerely hope you will be able to participate.

Organizing Committee: Professors Zhen Lei, Mikhail Korobkov, Adele Ferone, Remigio Russo and Konstantin Pileckas.

This seminar is organized by Fudan University (Shanghai, China) with the collaboration of Universita degli studi della Campania "Luigi Vanvitelli" (Caserta, Italy) and Vilnius University (Vilnius, Lithuania). This seminar is meant to gather renowned experts working on Geometric and Real Analysis with applications to PDEs and Mathematical Physics and represents an opportunity for presenting high-impact research, as well as facilitating the exchange of ideas between researchers.

2022-11-30

Sistemų analizės seminaras

Pirmadienį (lapkričio 28 d.) 13 val. 203 kab. (Akademijos g. 4) sistemų analizės seminare svečiuosis Prof. Eligius MT Hendrix (Malagos universitetas, Ispanija) ir skaitys pranešimą "A limited view on Lithuania: simplices and stochastic methods".

Pranešimo santrauka:
The focus of the seminar is on the relation of the speaker with the history and common interests with scientists of Lithuania. Given the outside temperature, let us start from the perspective of cold war. From there follows a sketch on the quest of convergence speed in stochastic global optimization and questions on simplicial branch and bound. We look forward to an entertaining and interactive discussion on the topics raised.

Kviečiame dalyvauti! (http://bit.ly/3GG1V8X).

2022-11-23

Lietuvos matematikų draugijos seminaras

2022 m. gruodžio 1 d. (ketvirtadienį) 17.00 val. 102 (J. Kubiliaus) auditorijoje vyks Lietuvos matematikų draugijos seminaras.

Pranešėja: Daiva Petkevičiūtė-Gerlach (KTU MGMF):

Pranešimo tema: DNR molekulės konfigūracijos nukleosomoje modeliavimas

DNR ląstelėse yra susivyniojusi į nukleosomas, sudarytas iš 147 bazių porų ilgio DNR ir baltymų histonų šerdies. Nukleosomos ne tik padeda kompaktiškai supakuoti DNR, bet ir reguliuoja genų raišką. Pranešime papasakosiu apie matematinį DNR mechanikos modelį cgDNA ir šiuo modeliu paremtą energijos minimizavimo metodą DNR konfigūracijai nukleosomoje prognozuoti. Minimizavimo rezultatai, juos lyginant su eksperimentiniais duomenimis, padeda geriau suprasti kaip nukleosomų išsidėstymas ir mobilumas išilgai DNR priklauso nuo genetinės sekos ir jos nulemtų DNR mechaninių savybių.

Seminare taip pat galima dalyvauti nuotoliniu būdu naudojant MsTeams.
Seminaro nuoroda:
https://teams.microsoft.com/l/meetup-join/19%3ameeting_MmFkYWRjYzctODZmZi00ZTFmLThlN2QtMGM1NWZmOGEyYWUz%40thread.v2/0?context=%7b%22Tid%22%3a%2282c51a82-548d-43ca-bcf9-bf4b7eb1d012%22%2c%22Oid%22%3a%2285b1cf71-4572-41d6-b008-1d6d806d4abb%22%7d

2022-11-21

Seminaras „Statistika ir jos taikymai“

Lapkričio 23 d. 16 val., 301 aud. (Matematikos ir informatikos fakultete, Naugarduko g. 24) vyks seminaras "Statistika ir jos taikymai".

Pranešėjas: Rimas Norvaiša (Matematinio švietimo centras)

Pavadinimas: Statistinių metodų taikymo pavyzdžiai tiriant matematikos vadovėlių kokybę.

Jeigu negalite atvykti, bus galimybė stebėti pranešimą per MS Teams. Prisijungimas: https://bit.ly/3Atow4O

2022-11-18

Sistemų analizės seminaras

Pirmadienį (lapkričio 21 d.) 13 val. 203 kab. (Akademijos g. 4) sistemų analizės seminare turėsime 2 pranešimus: prisistatys nauja doktorantė Ieva Rizgelienė ir doktorantūros studijų rezultatus pristatys Karolis Noreika "Agile Application Development Management Method Using Causal Knowledge". 

Vadovas – prof. dr. (HP) Saulius Gudas.

Kviečiame dalyvauti! (http://bit.ly/3gbIlGH).

2022-11-17

Fudan International Seminar on Analysis, PDEs and Fluid mechanics

The speaker: Professor Pavel Plotnikov (Lavrentyev Institute of Hydrodynamics, Novosibirsk)

Title of the talk:  “Isothermal coordinates on surfaces with a square-integrable second fundamental form. Existence and counterexamples”.

Time: Thursday, 17 of November, 15:00 - 16:00.

Abstract: The question of the existence of isothermal coordinates on two-dimensional surfaces goes back to the work of Gauss on differential geometry. The first nonlocal theorem on the existence of isothermal coordinates for quadratic differential forms with smooth coefficients was proved by Lichtenstein (1916). For forms with bounded coefficients this result was established by Morrey(1938). Morrey's theorem has been repeatedly reproved and refined. In modern literature, it is often referred to as the Ahlfors-Bers-Bojarski-Morrey theorem. Here we should also mention the result of Helein (2002) on the existence isothermal coordinates for differential quadratic forms with Sobolev coefficients.

For many applications, it is important to find isothermal coordinates with a uniformly bounded conformal factor logarithm. Such coordinates are called bi-Lipschitz coordinates. The existence of bi-Lipschitz coordinates is an essential ingredient of the mathematical theory of biological membranes. In 1994 Toro proved the remarkable theorem on the existence of bi-Lipschitz isothermal coordinates for surfaces with a square-integrable second fundamental form. It should be noted that her approach is based on the theory of varifolds and geometric measure theory. An analytical approach to the problem was proposed in the works of Kuwert and Li, and Riviera (2012). They introduced a class of weak immersions with a square-integrable second fundamental form. An immersion of a two-dimensional closed manifold into a Euclidean space belongs to this class if its first fundamental form is uniformly bounded above and below, and its second fundamental form is square integrable.

A common belief is the existence of bi-Lipschitz isothermal coordinates for all such immersions. This fact is widely used in the mathematical theory of biological membranes. In the proposed work, we show that this assertion is not true in the general case. We give an example of weak immersion of a two-dimensional sphere for which there are no bi-Lipschitz isothermal coordinates. On the other hand, we prove the existence of such coordinates for all weak immersions of tori. The connection of these results with Teichmüller's theory is discussed. Our approach is based on the Chern-Helein moving frame method and the Moser-Struwe result on the validity of the Liouville theorem for elliptic equations with bounded periodic coefficients.


ZOOM link:

https://us02web.zoom.us/j/83673138944?pwd=azQyc1BwUjJFY3VjMStLbFR5Z2VwUT09

ZOOM Id: 836 7313 8944

Passcode: 808818

We are pleased to inform you that the information on previous talks is available on the seminar web page https://researchseminars.org/seminar/Cafe_Analysis_and_Fluid. See Past Talks section.

We sincerely hope you will be able to participate.

Organizing Committee: Professors Zhen Lei, Mikhail Korobkov, Adele Ferone, Remigio Russo and Konstantin Pileckas.

This seminar is organized by Fudan University (Shanghai, China) with the collaboration of Universita degli studi della Campania "Luigi Vanvitelli" (Caserta, Italy) and Vilnius University (Vilnius, Lithuania). This seminar is meant to gather renowned experts working on Geometric and Real Analysis with applications to PDEs and Mathematical Physics and represents an opportunity for presenting high-impact research, as well as facilitating the exchange of ideas between researchers.

2022-11-15

Sistemų analizės seminaras

Pirmadienį (lapkričio 14 d.) 13 val. 203 kab. (Akademijos g. 4) sistemų analizės seminare doktorantūros studijų rezultatus pristatys Saulius Tautvaišas "Noisy Global Bayesian Optimization using Generalized Product of Experts".

Vadovas – prof. dr. (HP) Julius Žilinskas.

Kviečiame dalyvauti! (https://bit.ly/3WLA6BA).

2022-11-09

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