Chair News

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photo of the awarding ceremony of BASF Schwarzheide GmbH Föderpreis - awardee Dr. David-Maximilian Storch
Awarding ceremony of BASF Schwarzheide GmbH Föderpreis: awardee Dr. rer. nat. David-Maximilian Storch; Photo (image detail): Christian Hüller

Once a year, BASF Schwarzheide GmbH selects outstanding scientific works from TU Dresden focusing on sustainability, circular economy or digitalization. One out of three prizes in 2022, endowed with 1,500 Euros, was awarded to David-Maximilian Storch from our chair. His dissertation entitled "Statistical Physics of Urban Mobility" sheds new light on the complex dynamics of modern digital and shared mobility services. The work in particular uncovered how adoption of ride-sharing may be promoted, thus improving more sustainable transport through cleverly using digitization.

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visualisation of route choice schemes of cyclists in urban areas
The route choice of cyclists is subject to various decision factors. For example, many prefer a separate bike lane (top left) instead of sharing space with dense car traffic (top right). Depending on whether streets with heavy car traffic (thick edges) are equipped with dedicated bike paths (blue) or not (gray), cyclists take the direct route (black arrow, bottom left), take detours to stay on bike paths (bottom center) or ride on small side streets (thin edges) (bottom right). Image author: Christoph Steinacker

Turning it downside up: Novel, network-dynamic planning approach for urban bike path infrastructure enables demand-driven design of cycling networks by reversing the usual approach. The new concept could improve the bike-friendliness of cities - and thus their sustainability and climate footprint.
In surveys, a large majority of respondents usually agree that cycling can make a significant contribution to reducing greenhouse gases and to sustainable transport, especially in densely populated areas. In contrast, for many countries in reality there is a large gap between desired and actual numbers. In Germany, for example, only 20% of the short-distance of everyday trips in residential environments are covered by bicycle.

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portrait photo of Charlotte Lotze after winning the TUD Science Slam. She presents her award.
Charlotte Lotze (left) with the award. TUD Fellow Solmar-Varela-Salazar (right). Photo: Franziska Schneider, TU Dresden

Last Friday, the extremely popular Long Night of Science (Lange Nacht der Wissenschaften) finally took place again in Dresden, when countless research institutions open their laboratories and let the young and old participate in the diversity of their research topics. The central closing event of the #LNdWDD (with 32.000 visitors!) was a big Science Slam in the almost full Audimax of the TU Dresden. The 6 participants, 5 of them scientists on early career stages and one professor, who did not take part in the competition, are doing research in different fields such as chemistry, biology, physics or traffic science.

The participant from cfaed, Charlotte Lotze (Chair of Network Dynamics), bridges the last two topics: Based on physics, Charlotte is investigating a traffic-related topic in her PhD thesis.

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portrait photo of Dr. Malte Schröder
Dr. Malte Schröder

Ab Mai stellen sich TUD-Forscher:innen im Rahmen der Veranstaltungsreihe "Triff die Koryphäe unter der Konifere" wieder den Fragen der Öffentlichkeit im Botanischen Garten. Bei der Auftaktveranstaltung zur 2. Staffel am 15. Mai 2022 erläutert Dr. Malte Schröder vom cfaed, Lehrstuhl für Netzwerkdynamik, wie die Theoretische Physik helfen kann, neue Formen der Mobilität zu erfassen, zu verstehen und zu verbessern. Die Veranstaltung beginnt um 15:30 Uhr. Die Veranstaltungsreihe wird durch die EXU-Maßnahme "TUD im Dialog" gefördert.

Detaillierte Information hier

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Ride sharing buses (middle) combine direct trips of multiple users and drive shorter in total than the sum of the individual car routes (top). When users walk to a nearby stop, buses drive even shorter routes while maintaining the user travel times (bottom). Author: Charlotte Lotze.

Sustainable mobility is an important research field of the Chair of Network Dynamics (headed by Prof. Marc Timme) at the Center for Advancing Electronics Dresden (cfaed) at TU Dresden. Here, the chair’s researchers put a strong focus on “ride sharing”, i.e. the bundling of simultaneous trips of several people in one vehicle. A recently published study on this topic addresses the question how a dynamic combination of nearby stops enables more efficient ride sharing services.

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little figures carefully handling a covid test bar
Photo: Marco Federmann / Pixabay.

Scientists at the Institute of Science and Technology Austria (IST Austria) and at the Center for Advancing Electronics Dresden (cfaed / Technische Universität Dresden) show that little differences in behavior decide between success and complete failure of epidemic control. In their study, the scientists were able to show that limits in testing and contact tracing are responsible for this sudden change in the epidemic outcome. Testing followed up by contact tracing is extremely efficient in slowing down epidemics, however once their limit is exceeded the epidemic accelerates resulting in a faster than exponential spread. The study was published in the journal Nature Communications.

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illustration of different transportation models
Illustration: Christiane Kunath

An interdisciplinary research team from TU Dresden at the Chair of Network Dynamics headed by Prof. Marc Timme (Center for Advancing Electronics Dresden – cfaed & Institute of Theoretical Physics) has studied people's motivation to use "shared mobility" offers. In ride-sharing, trips of two or more customers with similar origins and destinations are combined into a single cab ride. The concept can make a significant contribution to sustainable urban mobility. However, its acceptance depends on human needs and behavior. For example, while shared rides typically offer a financial advantage, passengers might suffer drawbacks in terms of comfort and trip duration. These factors give rise to different adoption behaviors that explain usage patterns observed in 360 million real-world ride requests from New York City and Chicago in 2019. The study has now been published in the journal Nature Communications.

Press Release 2020 Sep 24

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yellow cabs, street scene
Photo: pixabay.com

[Deutsche Version unter "read more"]

Apps such as Uber are an important mobility feature in many big cities. Driving others from A to B in their own car has become a job for many people. However, many drivers complain that their income is too low. In May 2019, the US television station ABC reported how Uber drivers at Washington airport artificially inflated the price of the service by all going offline at the same time. Within a few minutes, the price of the service had risen by 13 dollars, which almost doubled the amount.  
How exactly does this strategy work and when is it used? This is what Dr. Malte Schröder and Professor Marc Timme from the Chair for Network Dynamics at the Center for Advancing Electronics Dresden (cfaed) and the Institute for Theoretical Physics at TU Dresden have been investigating alongside PhD students David-Maximilian Storch and Philip Marszal.

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Flyer SAN dynamics of complex networks

 

The next Scientific Area Network (SAN) by DRESDEN-concept will take place on 20 August at 5 p.m. in the Deutsches Hygiene-Museum Dresden. The SAN features an interdisciplinary perspective on the "Dynamics of Complex Networks" and looks at natural, technical as well as social networks from an scientific perspective. 18 presentations of 5 minutes each will present networks in a wide variety of scientific fields and thus encourage interdisciplinary exchange. In particular, scientific insights into multi-layered networks ("systems of systems") in the research fields of biology and neurology, social sciences, and the humanities as well as supply infrastructure (energy, water and transport) will be enabled. Prof. Marc Timme and Dr. Malte Schröder from our Chair will give an introduction to this complex topic.

Press Release - cfaed, 31 July, 2019

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Generality of response patterns.

Scientists from the Center for Advancing Electronics Dresden (cfaed) at TU Dresden, together with partners from other German universities and research institutions, have investigated how highly complex dynamical systems react to external influences using the example of power grids. The results contribute to an understanding of the processes that take place, for example, during the feeding of weather-dependent and thus strongly fluctuating renewable energies into the power grids. However, they can be transferred to various types of dynamical networks. The study has been published in the journal "Science Advances" on 31 July, 2019.