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Aktuellste Veröffentlichungen
Item type:Item, Urban cracks as adaptive playgrounds for future living(2026-07) Tayefehhosseinlou, ArdalanThis paper reframes neglected interstitial sites, or “urban cracks,” as resources for adaptive and participatory urbanism. It draws on established concepts, including lost space and terrain vague, to assert that the ambiguity and temporality of these sites provide opportunities for experimentation. The analysis is inspired by the philosophy of junk playgrounds, treating play as a guiding principle that suspends prescriptive norms and encourages collective improvisation. The study introduces Minimally Intrusive Interventions (MII), defined as lightweight, mobile, reversible, and abstract elements that activate urban cracks while maintaining their openness. The MII method unfolds iteratively by placing cues, observing site rhythms, inviting engagement, and refining interventions in response. Integrating urban cracks with MII produces adaptive playgrounds, environments in which meaning, relationships, and uses develop over time. This approach complements formal planning by promoting smallscale, provisional configurations and prioritizing observation and contextual resonance over fixed outcomes.Item type:Item, Amtliche Mitteilungen der Technischen Universität Dortmund Nr. 23/2026(Technische Universität Dortmund, 2026-10-05)Item type:Item, Amtliche Mitteilungen der Technischen Universität Dortmund Nr. 22/2026(Technische Universität Dortmund, 2026-10-02)Item type:Item, Uncovering obstacles and limitations of smartness: a cross-case analysis of smart cities and smart real estate(2026-09-05) Al-Rimawi, Tarek; Nadler, MichaelSmart cities and smart real estate are increasingly used to enhance urban efficiency, sustainability, and quality of life. Nevertheless, their implementation is hindered by interconnected challenges across concepts, technology, governance, economics, society, ethics, and the environment. Thus, this paper examines how and why interconnected limitations constrain the smartness of smart city and smart real estate initiatives and identifies the governance and implementation responses revealed by cross-case comparison. The analysis of secondary academic sources, policy papers, standards, and industry reports compares Toronto, Songdo, NEOM, and Barcelona. The results identify six categories of limitations: conceptual and strategic; technological and infrastructural; governance and institutional; economic and financial; social and ethical; and environmental. The analysis shows that the challenges facing these initiatives go beyond technology alone and include ambiguous definitions of smartness, poor governance, limited public involvement, privacy and surveillance risks, high implementation and maintenance costs, interoperability issues, and unverified assumptions that technological advancement will deliver sustainability. The comparison of cases highlights that the success of these initiatives depends on effective governance, responsible data management, public trust, financial feasibility, institutional coordination, and a life cycle approach. The study concludes that smartness should be understood as an integrated institutional, economic, social, technological, and environmental capacity rather than as the mere adoption of digital technologies.Item type:Item, Quantum beats of exciton-polarons in CsPbI₃ perovskite nanocrystals(2026-05-26) Trifonov, Artur V.; Nestoklon, Mikhail O.; Hollberg, M. Alex; Grisard, Stefan; Kudlacik, Dennis; Kolobkova, Elena V.; Kuznetsova, Maria S.; Goupalov, Serguei V.; Kaspari, Jan M.; Reiter, Doris E.; Yakovlev, Dmitri R.; Bayer, Manfred; Akimov, Ilya A.The optical response of semiconductors is governed by coupled electronic and vibrational excitations. In lead-halide perovskite nanocrystals, strong exciton–phonon interaction forms a ladder of exciton-polaron states accessible by femtosecond laser pulses. We demonstrate a fully coherent regime of exciton-polaron dynamics with long optical coherence times (T₂ ≈ 300 ps) in CsPbI₃ nanocrystals embedded in glass. Using transient two-pulse photon echo at a temperature of 2 K, we observe quantum beats between exciton-polaron states, with decay determined by optical phonon lifetimes of 5-15 ps. Within a four-level model, we directly quantify the exciton–phonon coupling strength through Huang–Rhys factors of 0.05 − 0.12 and 0.02 − 0.04 for low-energy optical phonons with energies of 3.2 and 5.1 meV, respectively. The pronounced size dependence of both coupling strengths and phonon lifetimes offers a route to tune the optical transitions between exciton-polaron states and tailor the coherent optical dynamics in perovskite semiconductors for solid-state quantum technologies.