Inverse Problems in Wave Propagation - IWaP 2015

Aims and Scope

The workshop on Inverse Problems in Wave Propagation (April 7-10, 2015) aims to gather researchers working in the broad field of inverse problems linked to partial differential equations, providing a place to discuss novel methods, current directions, and future trends in the field.

The workshop highlights in particular the mathematical and numerical analysis of methods tackling inverse problems linked to time-harmonic or time-dependent wave equations. Topics include for instance parameter identification for complex systems governed by differential equations, iterative and qualitative methods in inverse scattering, integral equation methods, optimization techniques, inverse eigenvalue problems, as well as the application of inversion algorithms in scientific, engineering, or industrial problems.

Place and Date

The workshop takes place at the University of Bremen, Germany, during the week after Easter 2015 (Tuesday 7.4.2015 until Friday 10.4.2015).

Organizers

The workshop is organized by the Workgroup on Inverse Problems at the Center of Industrial Mathematics of University of Bremen.

Acknowledgements

IWaP2015 is supported by the Center of Industrial Mathematics of University of Bremen as well as by the Exploratory Project Inside-Outside-Duality and Non-destructive Testing granted by the University of Bremen in the framework of its institutional strategy, funded by the excellence initiative of the federal and state governments of Germany.

Registration

Participation in the workshop is free of charge. To simplify the organization of the workshop we nevertheless insist that all participants register in advance by sending a short email to Stefan Peters.

Please tell us until March 1, 2015, whether you would like to give a talk and, if so, indicate the title of your talk. Since the number of talks is limited we might be forced to make a selection among the proposed talks, following a first-come-first-serve rule.

The workshop features a poster session. Please tell us until March 26, 2015, whether you intend to present a poster and, if so, indicate the title of your poster. There is no limit for posters and the session will be informal.

Schedule

	Tuesday April 7	Wednesday April 8	Thursday April 9	Friday April 10
09:00 10:45	R. Kress L. Mindrinos	E. Lakshtanov Z. Jiang	P. Monk G. Hu	T. Arens X. Liu
	Coffee break	Coffee break	Coffee break	Coffee break
11:15 12:05	T. Hohage	F. Cakoni	D. Colton	A. Kirsch
	Lunch	Lunch	Lunch	Lunch
13:30 15:15	M. Kray L. Bourgeois	R. Griesmaier N. Hyvönen	J. Sun A. Kleefeld
	Coffee break	Coffee break	Coffee break
15:45 17:30	J. Piontkowski H. Haddar	T. Helin L. Chesnel	Poster Session
19:00			Workshop dinner

Talks (in the order of the schedule)

• R. Kress: Iterative Solution of an inverse source problem
• L. Mindrinos: The inverse scattering problem in quantitative multi-modal tomography
• T. Hohage: Variational source condiitions and stability for inverse medium scattering problems
• M. Kray: Wave splitting for time-dependent scattered field separation
• L. Bourgeois: The method of quasi-reversibility for time-dependent wave equation. Application to the inverse obstacle problem
• J. Piontkowski: Reconstruction of the stored energy function of a certain class of hyperelastic materials from partial Cauchy data
• H. Haddar: A sampling method for differential measurements with unknown background
• E. Lakshtanov: Explicit methods for solving inverse problems
• Z. Jiang: Computing interior eigenvalues of domains from far fields
• F. Cakoni: On the direct and inverse scattering problem for periodic media
• R. Griesmaier: Multi-frequency MUSIC for electrical impedance tomography
• N. Hyvönen: Stochastic finite element method for electrical impedance tomography
• T. Helin: Inverse scattering in half-space with random boundary conditions
• L. Chesnel: Non-scattering wavenumbers and far field invisibility for a finite set of incident/scattering directions
• P. Monk: Time domain linear sampling method
• G. Hu: Near-field imaging of scattering obstacles with the factorization method
• D. Colton: Transmission eigenvalues for spherically stratified media
• J. Sun: Reconstruction of an inhomogeneity in planar waveguide using finite elements
• A. Kleefeld: Estimating the refraction index from the knowledge of interior transmission eigenvalues
• T. Arens: Characterizing non-scattering inhomogeneities for electromagnetic waves
• X. Liu: Inverse acoustic scattering by impenetrable cavities
• A. Kirsch: The Born approximation for the wave equation

You can download some slides of the talks on Tuesday and Wednesday (Slides IWaP 2015 Tuesday/Wednesday (application/zip 18.2 MB)) and on Thursday and Friday (Slides IWaP 2015 Thursday/Friday (application/zip 6.1 MB)).

Location

The workshop takes place in the university building MZH (Mehrzweckhochhaus), the largest building in the central area on the campus. Our rooms on the first floor are MZH 1460 and MZH 1470. All university facilities and university restaurants are nearby.

Here is a map of the university and its surroundings and a list of shops on campus.

Accomodation

There are three hotels on or close to campus:

• The 7THINGS is directly on campus, see this page for its location.
• The Atlantik Hotel Universium, is directly next to campus, see this page for its location.
• The Hotel Munte, is about 5 minutes away from the location of the workshop (walking distance), see this page for its location.

Public Transportation

Bremen has a very well developed public transportation system and we strongly encourage you to use it whenever going, e.g., into town, to the railway station, or to the airport. Maps of the tram and bus system in the city of Bremen can be found here and timetable information is available here.

Purchasing Tickets for the Tram

You can purchase your ticket at a ticket vending machine inside the tram. The ticket machines provide instructions in English and accept banknotes up to 50€ notes. You have to purchase an adult single ticket (EinzelTicket Erwachsene) for 2.50€. If you plan to use the tram frequently, you can buy a ticket for seven days for 20,00€ or ten single tickets for 22,50€ at the BSAG ticket shop outside the central train station or at the university at Onkel Walter's shop in the central Glashalle (glass hall), see the maker GH in square C2 on the campus plan www.uni-bremen.de/universitaet/die-uni-im-ueberblick/lageplan.html.

How to Get into Campus

• Tram line number 6 direction “Universität” takes you directly from the central train station and from the Bremen city airport to the university campus (stop "Universität Zentralbereich")
• You can also take the following busses (get off at the stop "Universität Zentralbereich"):
• no. 21 direction “Universität”,
  
• no. 22 direction “Universität-Lehe”
  
• no. 31 direction “Upper Borg”
  
• no. 630 direction “Zeven” or “Tarmstedt” (this is a fast connection)
  
• no. 670 direction “Worpswede” (this is a fast connection)
  

Arrival

Arriving by Plane or by Train

• When arriving at the Airport Bremen or at the Central Railway Station (Bremen HBF), then take the tram line 6 in direction “Universität”. This line directly goes into campus and takes about 40 Minutes from the ariport and 20 Minutes from the railway station. It is the fastest and cheapest way to get to campus. Get off at the tram stop “Universität Zentralbereich”.
• Taxi stands can be found both outside the airport and the central station

Arriving by Car

• From the autobahn A1 change at "Bremer Kreuz" to the A27, direction "Cuxhaven/Bremerhaven"
• Take exit number 19 "Horn-Lehe/Universität", follow the direction „Centrum/ Universität“
• At the second intersection turn right into "Universitätsallee" ("University Alley")
• At the next traffic light turn right again into the the "Enrique-Schmidt-Straße". Use the the parking lot there. The parking fee is 0.70 Euro per day.

Participants

Florian Bürgel	University of Bremen
Zixian Jiang	INRIA Saclay
Armin Lechleiter	University of Bremen
Frederieke Miesner	University of Bremen
Stefan Peters	University of Bremen
Marcel Rennoch	University of Bremen
Tobias Rienmüller	University of Bremen
Laurent Bourgeois	ENSTA Paristech, Palaiseau
Evgeny Lakshtanov	University of Aveiro
Hanaa HACHIMI	Ibn Tofail University
Leonidas Mindrinos	University of Vienna
Thorsten Hohage	University of Göttingen
Houssem Haddar	INRIA Saclay Ile-de-France
David Colton	University of Delaware
Fioralba Cakoni	University of Delaware
Peter Monk	University of Delaware
Jiguang Sun	Michigan Technological University
Tilo Arens	Karlsruher Institut for Technology (KIT)
Rainer Kress	University of Göttingen
Julia Piontkowski	University of Saarland
Marie Kray	University of Basel
Guanghui Hu	Weierstrass Institute
Anna Trull	TU Delft
Xiaodong Liu	Chinese Academy of Sciences
Thi-Phong Nguyen	Polytechnique Paris
Erdem Altuntac	University of Goettingen
Lucas Chesnel	Ecole Polytechnique
Andreas Kirsch	Karlsruher Institut fuer Technologie
Andreas Kleefeld	BTU Cottbus
Simon Maretzke	University of Göttingen
Frederic Weidling	University of Göttingen
Florian Boßmann	University of Göttingen
Tapio Helin	University of Helsinki
Roland Griesmaier	Universität Würzburg
David James	University of Göttingen
Zixian Jiang	Ecole Polytechnique Paris
Shobha Monnanda Erappa	University of Goettingen
Christian Kruschel	University of Goettingen
Kenneth Chijioke Duru	University of Stanford

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