Norbert Marwan
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Norbert Marwan
@pucicu.de
240 followers 86 following 220 posts
cave researcher, scientist at PIK, nonlinear data analysis, underwater rugby player

https://www.pik-potsdam.de/~marwan
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pucicu.de
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
November 22, 2025 at 11:24 PM
pucicu.de
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
October 21, 2025 at 6:41 PM
pucicu.de
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...
September 22, 2025 at 3:49 PM
pucicu.de
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
September 21, 2025 at 7:22 PM
pucicu.de
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. Caver descending a small pit.
August 25, 2025 at 8:55 AM
pucicu.de
Just arriving at Sägistal for an exciting week of cave research.
Blick in das Sägistal mit dem idyllischen See.
August 16, 2025 at 10:00 AM
pucicu.de
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.
August 11, 2025 at 5:34 PM
pucicu.de
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.
August 5, 2025 at 7:56 AM
pucicu.de
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.
June 6, 2025 at 9:01 PM
pucicu.de
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...
May 19, 2025 at 5:03 PM
pucicu.de
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...
May 18, 2025 at 10:59 AM
pucicu.de
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...
April 24, 2025 at 4:10 PM
pucicu.de
Von der vielzitierten "Renaissance der Atomkraft" ist in den Zahlen nichts zu sehen:

www.spiegel.de/wissenschaft...
April 9, 2025 at 9:05 AM
pucicu.de
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." 😃
April 3, 2025 at 3:48 PM
pucicu.de
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
March 21, 2025 at 12:05 PM
pucicu.de
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.
December 23, 2024 at 4:18 PM
pucicu.de
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).
December 23, 2024 at 4:09 PM
pucicu.de
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 @[email protected]. An entertaining experience for the students, just in time for Christmas.
December 20, 2024 at 9:13 PM
pucicu.de
Sägistal im steilen Sinkflug – schon fast –30°C!
December 20, 2024 at 8:26 PM
pucicu.de
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...
December 18, 2024 at 11:49 PM
pucicu.de
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).
December 13, 2024 at 11:32 AM
pucicu.de
In der Tat! Sägistal heute morgen bei exakt –25.0°C! Und damit fast 4K kälter als die anderen Standorte!
December 5, 2024 at 6:44 AM
pucicu.de
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...
November 18, 2024 at 9:32 AM
pucicu.de
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...
September 27, 2024 at 8:34 PM
pucicu.de
www.openpetition.de/petition/blo...
September 3, 2024 at 11:48 AM