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Norbert Marwan @pucicu.de · 25/09/2026

Next CTCS webinar by Prof. Peter Ashwin (University of Exeter, UK). Title: The non-autonomous dynamics of tipping points Date: September 28, 2026 Timing: 16:00 to 17:30 CEST (7:30 PM to 9:00 PM IST) Zoom link: us06web.zoom.us/webinar/regi... Webinar ID: 897 7129 7256 ctcs.iitm.ac.in/ctcs-webinar

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Norbert Marwan @pucicu.de · 03/09/2026

We organised a special session on #recurrence_plot analysis at the EUSIPCO 2026 – to bring this method to the signal processing people … Thanks to all speakers and to Martijn for the organisation! eusipco2026.org

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Norbert Marwan @pucicu.de · 21/05/2026

This month's CTCS webinar by Prof. Mahendra Verma (Indian Institute of Technology, Kanpur, India). Title: On the absence of the ultimate regime in turbulent thermal convection Date: May 25, 2026 Timing: 7:30 PM to 9:00 PM IST, 4:00 PM to 05:30 PM CET Zoom link: us06web.zoom.us/webinar/regi...

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Norbert Marwan @pucicu.de · 18/05/2026

Back from a new photogrammetry campaign in a Thuringian cave, collecting almost 100 GB data (more than 2000 photos) at two different, very exciting sites in the cave!

Mehrere Stalagmiten, auf einem ein Metashape-Marker. Links ein Metashape-Marker-Board.

Photogrammetrie-Ausrüstung in der Höhle, eine Powerstation, ein Geologen-Kompaß und ein Markerboard mit Schachbrettmuster.

Ein Höhlenraum mit Stalagmiten und etlichen Makaroni. Im Hintergrund sind ein paar Höhlenforscher zu sehen.

Extrem dicht hängende Makaroni (Sinterform in einer Höhle).

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Norbert Marwan @pucicu.de · 06/05/2026

Amazing - already more than 20 years that we left the beautiful site in Nice, where EGU conf. was hosted for 5 years.

Building of conference centre with a banner showing "20 years in Vienna"

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Norbert Marwan @pucicu.de · 16/04/2026

This month's CTCS webinar: Prof. Jeff Moehlis from the University of California, Santa Barbara. Title: "Controlling populations of neural oscillators". Date: April 20, 2026 Timing: 8:30 PM to 10:00 PM IST, 17:00 to 18:30 CEST Zoom link: us06web.zoom.us/w/87017801613

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Norbert Marwan @pucicu.de · 09/04/2026

That’s so crazy – in Germany, a speed limit of 130 km/h is completely out of the question … other countries are much more progressive in that respect.

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Norbert Marwan @pucicu.de · 26/03/2026

Yesterday we organised a special session on #recurrence_plot Analysis at the 45th Benelux Meeting on Systems and Control (BMSC 2026) in Lommel, Belgium.

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Norbert Marwan @pucicu.de · 22/03/2026

Using the same code for the energy-efficent RQA (from the paper doi.org/10.1140/epjs...) I found that the new Julia version 1.12.2 allocates more memory and is perfmoring slower than the previous version. 🤔

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Norbert Marwan @pucicu.de · 19/02/2026

This months CTCS webinar is given by Prof. Sudeshna Sinha (IISER Mohali, India) who will talk about "Performance-dependent network evolution for enhanced computational capacity" Date: February 23, 2026 Timing: 04:00 PM to 05:30 PM CEST, 08:30 PM to 10:00 PM IST us06web.zoom.us/webinar/regi...

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Norbert Marwan @pucicu.de · 26/01/2026

When using recurrence microstates from a #recurrence_plot we might wonder which kind of relationships they represent. We did a closer look in our recent study "Recurrence patterns correlation" journals.aps.org/pre/abstract...

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Norbert Marwan @pucicu.de · 26/01/2026

Back from a tour in a central-German gypsum cave – collecting data for new upcoming student projects about micro-structures at the cave walls.

Cave chamber with a scientist taking photos from the ceiling and a LIDAR in front which is measuring 3D spatial data from this cave.

Cave researcher sitting in front of an opened box and handling/ preparing a measurement device.

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Norbert Marwan @pucicu.de · 12/01/2026

Inspired by recurrence microstates, I developed an efficient, sampling-based approach for recurrence quantification analysis, significantly reducing computation time – and, consequently, energy consumption. Published today open access. #recurrence_plot doi.org/10.1140/epjs...

Line graph comparing computation time (in seconds, log scale) versus data length N (log scale) for five Recurrence Quantification Analysis (RQA) methods: RQA_RP, RQA_woRP, RQA_samp, RQA_samp², and RQA microstates. The graph shows that RQA_samp and RQA microstates consistently require the least computation time, while RQA_RP requires the most, with all methods increasing in time as data length grows.

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Norbert Marwan @pucicu.de · 22/11/2025

Next CTCS webinar next Monday, Nov 24, 2025, 8:30 PM to 10:00 PM IST, 4:00 PM to 05:30 PM CET Prof. Balakumar Balachandran from the University of Maryland, will talk about "Can noise be used to realize the desired dynamics?" us06web.zoom.us/webinar/regi... ctcs.iitm.ac.in/ctcs-webinar

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Norbert Marwan @pucicu.de · 21/10/2025

This month's CTCS webinar: Prof. Dibakar Ghosh (Indian Statistical Institute, Kolkata) Coexisting dynamics of swarming and synchrony in complex systems Date: Oct 27, 2025 Tim: 8:30 PM IST/ 4:00PM CET Zoom link: us06web.zoom.us/webinar/regi... Webinar ID: 872 4023 8715

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Norbert Marwan @pucicu.de · 22/09/2025

This month's CTCS webinar will be delivered by Dr. Frank Hellmann from our institute @pik-potsdam.bsky.social Title: Dynamics of modern power grids - A complex systems perspective Time: September 29, 2025, 16:00 CEST. us06web.zoom.us/webinar/regi...

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Norbert Marwan @pucicu.de · 21/09/2025

Talking about my bibliographic studies on #recurrence_plot and recurrence quantification analyses at the 11th recurrence plot symposium in Mexico city dx.doi.org/10.1007/978-... symposium.recurrence-plot.tk

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Norbert Marwan @pucicu.de · 25/08/2025

Very successful cave week with a lot of newly discovered an mapped cave meters!

Karst plane with two cavers looking out of a cave.

Caver entering a pit. Second caver watching.

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Norbert Marwan @pucicu.de · 16/08/2025

Just arriving at Sägistal for an exciting week of cave research.

Blick in das Sägistal mit dem idyllischen See.

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Norbert Marwan @pucicu.de · 11/08/2025

In a recent study I investigated how #recurrence_plot based methods evolved over time, indicated milestone papers and classes of studied subjects, journal ranking, and citation performance. It was a lot of fun to analyse the bibliographic database! link.springer.com/chapter/10.1...

Histogram plot showing the sum of citations (of all papers) vs. the time of the citation (years after publication).

Cumulative distribution of total number of authors publishing in the field vs. year. It shows an exponential trend.

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Norbert Marwan @pucicu.de · 05/08/2025

The catalog is available at ar.pik-potsdam.de We provide the data, examples scripts for downloading, and a lot of explanations.

Screenshot of the webpage, showing the entrance page with a global map and some atmospheric rivers.

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Norbert Marwan @pucicu.de · 06/06/2025

Just got back from a great tour in a Thuringian cave! 📸✨ We were capturing photogrammetric data to create 3D models of stunning sodastraw speleothems and testing equipment for a longterm photogrammetry study in a Swiss alpine cave.

Cave passage with sodastraw speleothems and a cave researcher who is preparing a photo for scientific photogrammetric studies.

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Norbert Marwan @pucicu.de · 19/05/2025

This month's CTCS webinar will be delivered by Prof. Plamen Ivanov from Boston University, Massachusetts, US. He will talk about "The new field of network physiology: Building the human Physiolome". Date: May 29, 2025 Timing: 05:00 PM to 07:00 PM CEST Zoom link: us06web.zoom.us/webinar/regi...

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Norbert Marwan @pucicu.de · 18/05/2025

In our 2022 study, we introduced the inter-spike spectrum—a new analogue to the power spectrum using #recurrence_plot analysis. By sparsely decomposing the τ-recurrence rate into Dirac combs, we revealed dominant periodicities and transitions in complex systems. doi.org/10.3390/e241...

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Norbert Marwan @pucicu.de · 24/04/2025

This month's CTCS webinar will be delivered by Prof. G. Ambika from IISER, Thiruvananthapuram, India. She will talk about "Emergent Dynamics and transitions on multiplex networks". April 28, 2025, 16:00 CEST (19:30 Indian Standard Time) us06web.zoom.us/webinar/regi...

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Norbert Marwan @pucicu.de · 09/04/2025

Von der vielzitierten "Renaissance der Atomkraft" ist in den Zahlen nichts zu sehen: www.spiegel.de/wissenschaft...

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Norbert Marwan @pucicu.de · 03/04/2025

I'm really happy that Matheus @palmero.bsky.social has joined my group for the coming year, working on dynamical systems, #recurrence_plot, and #machine_learning." 😃

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Norbert Marwan @pucicu.de · 21/03/2025

This month's CTCS webinar will be delivered by Prof. Kathy Lüdgefrom the Technische Universität Ilmenau, Germany. She will talk about "Exploiting delay-induced nonlinear dynamics for photonic reservoir computing". us06web.zoom.us/webinar/regi...

Info text on the seminar, showing time of talk and photograph of speaker

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Norbert Marwan @pucicu.de · 23/12/2024

You can find such statements in most journals and across almost all publishers. You would think that the whole discussion about the reproducibility of studies had never taken place.

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Norbert Marwan @pucicu.de · 23/12/2024

It’s 2024, almost 2025—why are we still seeing sentences like "Data will be made available on request" in peer-reviewed scientific papers? This is no longer acceptable. Either share the data and code openly or provide a valid reason why this is not possible (e.g., privacy concerns).

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Norbert Marwan @pucicu.de · 20/12/2024

This week, after quite some time, I gave a lecture again on 'Caves as Scientific Archives' in the Earth System Science program at the @geowpotsdam.bsky.social @unipotsdam@wisskomm.social. An entertaining experience for the students, just in time for Christmas.

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Norbert Marwan @pucicu.de · 20/12/2024

Sägistal im steilen Sinkflug – schon fast –30°C!

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Norbert Marwan @pucicu.de · 18/12/2024

Finally, we also got the printed book on Grand Challenges with our contribution on "Physics for the environment and sustainable development" (including #recurrence_plot and #complex_networks analysis) – what a thick book! iopscience.iop.org/book/oa-edit...

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Norbert Marwan @pucicu.de · 13/12/2024

New speleothem samples collected this year in Sägistal have interesting ages, filling the gaps between already available ones, covering MIS 5, 11, 13, and 17. Enough stuff for the next years of research! @kryophil.bsky.social @speleoseb.bsky.social

Collecting water samples in a cave in Sägistal (Bernese Oberland, CH).

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Norbert Marwan @pucicu.de · 05/12/2024

In der Tat! Sägistal heute morgen bei exakt –25.0°C! Und damit fast 4K kälter als die anderen Standorte!

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Norbert Marwan @pucicu.de · 18/11/2024

The next CTCS Webinar will be given by Prof. Celso Grebogi on November 25th, 2024, 8:30 PM India (16:00 PM CET), on "Crisis – Danger and Opportunity". us06web.zoom.us/w/8110146404...

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Norbert Marwan @pucicu.de · 27/09/2024

This month, we are delighted to have Ehud Meron from Ben Gurion Univ. Join us for CTCS Webinar (jointly hosted by IITM and @pik-potsdam.bsky.social) on September 30. He will talk about multi-level ecosystem response to drying climate trends. us06web.zoom.us/w/8444269375...

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Norbert Marwan @pucicu.de · 03/09/2024

www.openpetition.de/petition/blo...

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Norbert Marwan @pucicu.de · 27/08/2024

PhD position on the Reconstruction of Alpine glaciations from cave sediment records, 4 years at SISKA (La Chaux-de-Fonds, Switzerland) – large parts of the research will be in caves!

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Norbert Marwan @pucicu.de · 31/07/2024

We eagerly anticipate continuing our cave research next year.

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Norbert Marwan @pucicu.de · 31/07/2024

Back from very successful cave research week in Switzerland. Collecting bones and water samples, performing photogrammetric analysis, and installing dishes for calcite precipitation.

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Norbert Marwan @pucicu.de · 17/07/2024

Our cave camp in Sägistal will start in a few days. We hope for good weather.

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Norbert Marwan @pucicu.de · 28/06/2024

One of my PhD students (Maria) got already a great achievement – her musical pieces performed at Teatro Massimo of Palermo! Congratulations, Maria! www.teatromassimo.it/en/event/4-c...

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Norbert Marwan @pucicu.de · 26/05/2024

This month's CTCS webinar will be delivered by Gabriel Mindlin from University of Buenos Aires. He talks about 'Listening to bird's dreams'. Zoom Link: us06web.zoom.us/webinar/regi... Webinar ID: 824 1354 8632 Passcode: 447884 Timing: 7:30 pm Indian Standard Time; 4 pm CEST Date: 27th May 2024.

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Norbert Marwan @pucicu.de · 20/05/2024

Local extreme rainfall event with > 50 mm in 15 min. Our water cistern filled in this time from 20% to 100% – never happened before. (Luckily we live on a slope)

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Norbert Marwan @pucicu.de · 17/05/2024

Back from collecting climate data from above and within Bleßberg cave.

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Norbert Marwan @pucicu.de · 05/05/2024

Seems we had more visitors at our presentation at the Potsdam Day of Science yesterday – more young kids and more visitors in general than during the last "Nights of science". The shift in daytime was likely the reason. But it was fun again! If you could not come – you surely missed this 🚀 event!

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Norbert Marwan @pucicu.de · 25/04/2024

Wir machen wieder einen Stand zu Paläoklimaforschung in Höhlen und zeigen auch ein paar Tropfsteine und ein Experiment, wie Tropfsteine wachsen. Und vielleicht gibt es auch wieder ein paar Fledermäuse …

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Norbert Marwan @pucicu.de · 24/03/2024

This month's CTCS webinar by Prof. István Z. Kiss from Saint Louis University: "Synchronization Engineering: How to Improve Synchronization with Control and Heterogeneities" March 25, 2024; 7:30 pm (Indian Standard Time), 15:00 (Central Europe Time) Zoom Link: us06web.zoom.us/webinar/regi...

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Norbert Marwan @pucicu.de · 22/02/2024

This month's CTCS webinar will be delivered by Dr. Krishnan Raghavan on 26th February 2024. He will talk about the role of large volcanic eruptions on the ENSO and Indian Monsoon Coupling. Time: 8:30 PM Delhi 4:00 PM (Berlin) 10:00 AM (New York) 7:00 AM (California)

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