Hamburg University of Technology

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...

Critical impact of thermal management systems on on-board systems in hydrogen-powered aircraft

<title>Abstract</title> Hydrogen-powered aircraft offer a promising pathway to reduce the aviation sector's climate impact, with fuel cells providing high-efficiency power conversion at around 50%. However, producing considerable waste heat at around 80°C. Since this heat is gene...

Comprehensive inter-comparison of generative AI models for super-resolution precipitation downscaling across hydroclimatic regimes

Abstract. High-resolution precipitation information is essential for hydrologic modeling, flood forecasting, and climate-risk assessment, yet global weather and climate models operate at spatial resolutions too coarse to resolve storm structure, intermittency, and extremes. Deep-...

Visual detection of flap tears on abrasive flap wheels using deep learning

Abstract During abrasive flap wheel grinding, flaps may fail and tear prematurely. Such flap tears increase local tool flexibility and can impair the uniformity of material removal in automated grinding processes. To ensure process reliability, this paper proposes a novel compute...

Challenges and opportunities of solar geoengineering for climate governance

Purpose This review characterizes the governance challenges arising from the potential deployment of solar geoengineering. The authors survey existing theoretical models that analyze the strategic incentives such technologies generate. In particular, this study examines the condi...

CMR-based aortic stiffness parameters in a symptomatic high risk obstructive sleep apnea cohort: results from the population-based Hamburg City Health Study

Abstract Background Aortic stiffness (AS) parameters as pulse wave velocity (PWV), aortic distensibility of the ascending and descending aorta (AD AoAsc, AD AoDesc) and pulse pressure (PP) are marker for vascular ageing, whereas data concerning obstructive sleep apnea (OSA) in po...

Aerographite vsGraphite: Investigating the Role ofElectrode Architecture in H2-Mediated ElectroautotrophicBiofilms

Abstract Oxic microbial electrosynthesis using aerobic hydrogenotrophic bacteria requires productive cathodic biofilm formation, yet reactive oxygen species (ROS) generated at the electrode surface present a critical barrier to initial colonization. This study investigates biofil...

Groundwater Variability Is Strongly Linked to Soil Temperature Across Global Aquifers

Abstract Groundwater plays a critical role in land‐atmosphere interactions by regulating soil moisture and surface energy fluxes, yet its contribution to land‐surface processes and heat extremes remains poorly quantified globally. Here, we combine observation‐based aquifer record...

The Hamburg Method for active cities: a multi-level framework for evidence-based urban physical activity promotion

Abstract Physical inactivity is a persistent global public health challenge, particularly in urban settings where complex social, environmental, and infrastructural factors shape opportunities for physical activity. Despite extensive evidence on effective interventions, a persist...