Hamburg University of Technology

A cellular automata framework to study the diffusion in single and binary solvent systems

Abstract In this work, we present a two-dimensional cellular automata (CA) model to study mass transfer by diffusion of molecules in single and binary solvent systems. The method builds on Vanag’s probabilistic cellular automata (PCA), where diffusion is simulated through stochas...

Brief communication: A novel wake mixing phenomenon and key parameters for wake recovery of floating wind turbines subjected to surge motions

This letter clarifies the key parameters governing the wake recovery of a floating wind turbine undergoing surge motions. A dedicated wind tunnel campaign covering reduced frequencies ( St p ) well beyond the current literature is presented. This enabled a full characterisation o...

Parameter Estimation for Model-Based Sensing of Magneto-Mechanical Resonators

Abstract Magneto-mechanical resonators (MMRs) represent a recently proposed type of passive sensor that enables the estimation of its pose as well as sensing other parameters in its environment. The working principle of MMRs entails an excitation of the sensors by oscillating mag...

LLM-driven design of physics-constrained constitutive models: Two agents are better than one

Abstract Developing constitutive models that capture how materials deform under load traditionally requires years of specialized expertise in continuum mechanics, machine learning, and scientific programming. Large language models (LLMs) have recently been shown to lower this bar...

Efficient Chebyshev reconstruction for the anisotropic equilibrium model in magnetic particle imaging

Abstract Objective: Magnetic Particle Imaging (MPI) is a tomographic imaging modality capable of real-time, high-sensitivity mapping of superparamagnetic iron oxide nanoparticles. Model-based image reconstruction provides an alternative to conventional methods that rely on a meas...

Tinnitus in urban settings: insights into lifestyle and medical factors from the Hamburg City Health Study

PURPOSE: Tinnitus is a common and multifactorial auditory condition associated with considerable psychosocial burden. Evidence regarding its relationship with demographic, lifestyle, and medical factors remains inconsistent. This study aimed to determine the prevalence and correl...

Demulsification kinetics of water-in-oil crude oil emulsions using peracetic-oxidized rice husk lignin

Crude oil water-in-oil (W/O) emulsions present persistent operational challenges during petroleum production and processing because of their resistance to droplet coalescence and phase separation. Although lignin-derived materials have emerged as promising sustainable demulsifier...

Microfoundations of Dynamic Capabilities for Eco‐Innovation in SMEs: Evidence From Industrial Case Studies

ABSTRACT This study examines the microfoundations, that is, skills, processes, structures and decision rules that underlie the dynamic capabilities enabling SMEs to achieve sustained eco‐innovation performance. Building on dynamic capabilities framework, we adapt it to the SME co...

Soil redox potential and plant species identity likely affect root-associated fungi in salt marshes

Abstract Root-associated fungi (RAF) are important for plant performance because they form beneficial, neutral, or pathogenic relationships with their hosts, thus regulating nutrient uptake, stress tolerance, and overall plant fitness. At the transition from marine to terrestrial...

Innovation dynamics across institutional environments: regulatory exposure and geopolitical shocks in nanotechnology

Nanotechnology represents a general-purpose technology with significant transformative potential across industrial sectors. Its commercialization, however, unfolds within regulatory systems that differ across application domains and countries, making institutional exposure a stra...

In-Context Molecular Property Prediction with LLMs: A Blinding Study on Memorization and Knowledge Conflicts

Abstract The capabilities of large language models (LLMs) have expanded beyond natural language processing to scientific prediction tasks, including molecular property prediction. However, their effectiveness in in-context learning remains ambiguous, particularly given the potent...

Source-Free Domain Adaptation with Vision-Language Prior

Abstract Source-Free Domain Adaptation (SFDA) seeks to adapt a source model, which is pre-trained on a supervised source domain, for a target domain, with only access to unlabeled target training data. Relying on pseudo labeling and/or auxiliary supervision, conventional methods...

Biomineralization-Assisted Valorization of Phosphogypsum

Abstract The sustainable management of phosphogypsum (PG), a solid waste generated during phosphate fertilizer production via the wet-process phosphoric acid route, remains a major environmental and resource challenge. Transforming this waste stream into functional resources is a...

Reconstruction-Free EIT for Injection-Pattern Classification and Superficial Gas Velocity Regression as Proxies for Local Gas Holdup in Bubble Columns

Abstract Electrical impedance tomography (EIT) as a noninvasive tomographic technique is increasingly applied to multiphase reactor monitoring; however, conventional image reconstruction is ill-posed and regularization-dependent and may be redundant in applications where the prim...

Advanced Micromolding Approach toward Scaling-Up Smart Hydrogel Microvalves

Abstract Smart hydrogel valves are a promising technology for autonomous process control. At the macroscale, hydrogel valves offer high flow rates with slow response times, whereas hydrogel microvalves offer low flow rates with fast response times. This contradiction limits the p...

Invited perspectives: Towards usable compound event research

Abstract. Supporting stakeholders with science-based decision-making to mitigate and adapt to climate change impacts is a central mandate of the climate research community. In particular, mapping out scenario-dependent climate risk landscapes is one of the most pressing challenge...

Moiré‐Induced Symmetry Breaking of Charge Order in van der Waals Heterostructures

ABSTRACT Layered materials that stack different lattice symmetries are rare in nature. Misfit layered chalcogenides, which combine square and hexagonal lattices of rocksalt monochalcogenides and transition‐metal dichalcogenides, provide a platform to explore how incommensurabilit...

Topology optimization considering contact and stress constraints

Abstract This work advances the field of stress-constrained topology optimization by addressing frictionless unilateral contact problems. The approach focuses on minimizing mass of a contact-constrained structure while enforcing stress-constraints using local or global stress mea...

Robot in a crib: How a playing robot helps us understand sensorimotor contingency learning

Learning sensorimotor contingencies—that is, the link between one’s actions and their sensory effects—is fundamental to developing body knowledge, understanding causality, and developing a sense of agency. In developmental psychology, this process is classically studied using the...

Oxygen minimum zones in the Indian Ocean and their response to changes in the Indian Ocean meridional circulation

Abstract. The Oxygen Minimum Zones (OMZs) in the northern Indian Ocean (i.e., the Arabian Sea and the Bay of Bengal) are among the most intense OMZs in the world's oceans. While there has been no clear evidence of a significant change in the Bay of Bengal OMZ (BoB OMZ), the Arabi...