University of Bremen

Spring phytoplankton bloom dynamics reveal thresholds of ocean alkalinity enhancement in the North Sea

Abstract Spring phytoplankton blooms drive primary production and food web dynamics in marine ecosystems. Ocean alkalinity enhancement, a proposed carbon dioxide removal strategy, alters seawater chemistry and could disrupt planktonic food webs, yet its ecological consequences re...

An analytical model for hatch-wise thermal histories near overhangs in laser powder bed fusion

Abstract Overhanging features in laser powder bed fusion (LPBF) are prone to heat accumulation and related defects because of limited heat dissipation. We propose a reduced analytical thermal model for efficient prediction of hatch-wise temperature histories near overhanging boun...

Turbulence characterization in near-coastal environment using triple short-range lidars and mast anemometry

Single- and two-point turbulence spectra derived from wind velocity measurements at a near-coastal site in northern Germany are analysed across a wide range of atmospheric-stability conditions. Spectral estimates are obtained from sonic and cup anemometer data, as well as from ve...

Beyond Ce–U Charge Transfer: Strain and Polarons in Epitaxial Ce1– x U x O2(111)

Abstract The redox chemistry of mixed ceria-based oxides is commonly interpreted in terms of direct charge transfer between neighboring cations. In the Ce1–xUxO2 system, this corresponds to the oxidation of U4+ into U5+ accompanied by the reduction of Ce4+ into Ce3+. In this work...

Detectability of solid particle injections into the stratosphere with satellite solar occultation instruments

Stratospheric aerosol injections (SAI) have been proposed as a potential climate intervention to mitigate some effects of global warming. This method involves the idea of injecting sulphur dioxide into the stratosphere. Other ideas include the injection of solid particles, like a...

Ablation of AV Nodal Reentrant Tachycardia in Octogenarians: Safety and Efficacy in a Large Comprehensive Single‐Center Analysis

ABSTRACT Introduction Atrioventricular nodal reentrant tachycardia (AVNRT) is the most common supraventricular tachycardia and is generally considered benign, with excellent outcomes following catheter ablation. However, data on procedural safety and efficacy in very elderly pati...

Honeydew microbial ecology: A neglected frontier in multitrophic networks

Abstract Honeydew, the sugary excretion produced by sap-feeding Hemiptera, is one of the most common carbohydrate resources in many plant-based food webs. Honeydew supports a wide range of organisms, including ants, pollinators, (hyper-)parasitoids wasps, predatory insects, and m...

Freshwater‐Induced Surface Cooling of the Subpolar North Atlantic in a Large‐Ensemble, High‐Resolution, Coupled Model

Abstract As a gateway between the Arctic and subtropics, the subpolar North Atlantic plays a key role in large‐scale climate variability. In recent decades, the region has experienced pronounced freshening. While much attention has been paid to the expected long‐term weakening of...

Sustainable logistics and supply chain performance with human–machine collaboration in the context of Industry 5.0: a holistic structural model analysis

Purpose This study aims to examine the relationships between human–machine collaboration (HMC), operational efficiency (OE), resource efficiency (RE), workforce capability (WC), and sustainable logistics and supply chain performance (SLSCP) within the context of Industry 5.0. The...

C-PEAT's Global Peatland Carbon Database (v.2025)

Abstract. Field-based measurements are foundational to the study of short- and long-term peatland carbon dynamics. For decades, the scientific community has amassed hundreds of valuable empirical datasets in the form of peat core records from around the world. Those records typic...

Development and effectiveness of a user-centered mobile application for informal caregivers of people living with dementia: randomized controlled trial

Abstract Background Dementia places substantial physical, psychological, and social demands on informal caregivers, and caregiving needs may change across the dementia trajectory as cognitive, behavioral, and functional changes alter day-to-day care demands. Digital interventions...

SurvSurf: a partially monotonic neural network for first-hitting time prediction of intermittently observed discrete and continuous sequential events

Abstract We propose SurvSurf, a neural-network-based survival model for direct, simultaneous probabilistic prediction of first-hitting times of sequential events from baseline. Unlike existing models, SurvSurf is theoretically guaranteed to never violate the monotonic relationshi...

An experimental campaign to measure turbulence in the marine boundary layer

Abstract. There is a lack of measurement data on the spatial structure of turbulence at heights greater than 100 m in the marine atmospheric boundary layer (MBL). Consequently, turbulence models like the Mann and Kaimal models, which are referred to in industry standards, have no...

Preferential Nucleation Sites Regulate Hydrogen Bubble Evolution on Mesh Electrodes

Gas-bubble evolution substantially affects the efficiency of gas-evolving electrochemical processes, including water electrolysis. Bubble nucleation, growth, coalescence, and detachment influence the electrode potential, while persistent bubble coverage can impede ionic...

A robot-assisted optical approach for the in-situ measurement of cutting tool wear development

Abstract In-situ measurement of cutting tool wear is essential for understanding wear mechanisms and for improving machining reliability and process efficiency. However, most established measurement methods require periodic interruption of machining operations and tool removal, w...

Translating Computational Methods into (and out of) Sociology: How Research Support Units Negotiate Values, Responsibilities, and Standards for Societal Analysis

Digital methods, Big Data, and AI increasingly shape societal analysis in two directions: sociologists adopt computational approaches developed in STEM fields, and STEM-trained researchers work with digital traces, large-scale data, and AI tools in projects addressing sociologica...

Translating Computational Methods into (and out of) Sociology: How Research Support Units Negotiate Values, Responsibilities, and Standards for Societal Analysis

Digital methods, Big Data, and AI increasingly shape societal analysis in two directions: sociologists adopt computational approaches developed in STEM fields, and STEM-trained researchers work with digital traces, large-scale data, and AI tools in projects addressing sociologica...

Environmental drivers of litter- and soil-dwelling springtail communities across European forests, assessed by morphotaxonomy and soil DNA metabarcoding

Springtails are abundant in forest litter and soils, where they play a crucial role in the transformation and decomposition of organic matter. However, most data on springtail communities originates from studies at the local and regional levels, while larger-scale studies are lac...

How metacognitive architectures remember their own thoughts: a systematic scoping review

Abstract Metacognition has gained significant attention for its potential to enhance autonomy and adaptability of artificial agents but remains a fragmented field: diverse theories, terminologies, and design choices have led to disjointed developments and limited comparability ac...

Consumption of Fructose by Cultured Primary Rat Astrocytes

Abstract Fructose has recently gained substantial interest in the context of diseases that are connected with sucrose-rich diets. Several studies have shown that astrocytes are able to metabolize fructose to some extent but less efficiently than glucose. To study whether and how...