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An illustrated guide to:Distributed and integrated fibreoptic sensing in seismology

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Earthquake Science 2025年第1期38卷 67-77页

作者： Andreas Fichtner fabian Walter Patrick Paitz Sara Klaasen Daniel C.Bowden Sebastian Noe Nils müller Dominik Husmann Jacques morel Department of Earth Sciences ETH ZürichZürich 8049Switzerland Swiss Federal Institute for Forest Snow and Landscape ResearchBirmensdorf 8903Switzerland Swiss Federal Institute of metrology METAS Bern 3003Switzerland

The properties of laser signals are affected by deformation of the optical fibre through which they are *** this deformation dependence is undesirable in telecommunication,it can be exploited for the construction of novel seismic sensors that fill a niche in data acquisition where traditional seismometer arrays would be difficult to *** includes densely populated urban centers,the oceans,volcanoes and the Earth’s polar *** notes complement a presentation on recent methodological developments and applications in fibre-optic *** first part is focused on the use of distributed fibreoptic sensing in cryosphere research,and specifically the investigation of the internal structure and seismicity of glaciers and ice *** second part is dedicated to recent advances in integrated fibre-optic sensing,with emphasis on novel measurement principles and sensitivity.

关键词： seismology fibre-optics cryosphere earthquakes

Reinforcement Learning in mechatronic Systems: A Case Study on DC motor Control

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Circuits and Systems 2025年第1期16卷 1-24页

作者： Alexander Nüßgen Alexander Lerch René Degen marcus Irmer martin de Fries fabian Richter Cecilia Boström margot Ruschitzka CAD CAm Center Cologne Institute of Automotive Engineering Cologne (IFK) Faculty of Automotive Systems and Production Cologne University of Applied Science Cologne Germany Division of Electricity Department of Electrical Engineering Uppsala University Uppsala Sweden Heringer Consulting GmbH Cologne Germany

The integration of artificial intelligence into the development and production of mechatronic products offers a substantial opportunity to enhance efficiency, adaptability, and system performance. This paper examines the utilization of reinforcement learning as a control strategy, with a particular focus on its deployment in pivotal stages of the product development lifecycle, specifically between system architecture and system integration and verification. A controller based on reinforcement learning was developed and evaluated in comparison to traditional proportional-integral controllers in dynamic and fault-prone environments. The results illustrate the superior adaptability, stability, and optimization potential of the reinforcement learning approach, particularly in addressing dynamic disturbances and ensuring robust performance. The study illustrates how reinforcement learning can facilitate the transition from conceptual design to implementation by automating optimization processes, enabling interface automation, and enhancing system-level testing. Based on the aforementioned findings, this paper presents future directions for research, which include the integration of domain-specific knowledge into the reinforcement learning process and the validation of this process in real-world environments. The results underscore the potential of artificial intelligence-driven methodologies to revolutionize the design and deployment of intelligent mechatronic systems.

关键词： Artificial Intelligence in Product Development mechatronic Systems Reinforcement Learning for Control System Integration and Verification Adaptive Optimization Processes Knowledge-Based Engineering

Associations of Physical Activity and Sedentary Behavior with Internalizing Problems among Youth with Chronic Pain

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International Journal of mental Health Promotion 2025年第2期27卷 97-110页

作者： Lingling Yu Yanxia Chen Jinming Li André O. Werneck fabian Herold Alyx Taylor Benjamin Tari Liye Zou Department of Physical Education Inner Mongolia Normal University Hohhot 010022 China Body-Brain-mind Laboratory School of Psychology Shenzhen University Shenzhen 518060 China Department of Physical Education Shanghai Jiao Tong University Shanghai 200240 China Center for Epidemiological Research in Nutrition and Health Department of Nutrition School of Public Health Universidade de São Paulo São Paulo 01246-904 Brazil Research Group Degenerative and Chronic Diseases Movement Faculty of Health Sciences University of Potsdam Potsdam 14476 Germany Health and Rehabilitation Sciences Health Sciences University Bournemouth BH5 2DF UK Department of Psychiatry University of Oxford Oxford OX3 7JX UK

Background Taking actions to maintain a healthy lifestyle, including regular engagement in physical activity (PA) and reducing sedentary behavior (SB), may protect against the development of internalizing problems among healthy youth. However, it remains unclear whether such associations exist among youth with chronic pain who often report symptoms of depression and anxiety. To this end, we aimed to investigate the associations between independent and combined PA and/or SB patterns with indicators of internalizing problems in this vulnerable population. methods Data used in this cross-sectional study were retrieved from the U.S. National Survey of Children’s Health for the years 2021–2022. Specifically, caregiver proxy reports on sociodemgraphic factors and lifestyle behaviors of 4735 U.S. children and adolescents (referring to youth) aged 6–17 years were collected. We examined independent and combined patterns of PA and SB as exposures, with internalizing problems serving as outcomes of interest. Logistic regressions were used to examine the independent and combined associations of PA and/or SB patterns with anxiety and depression symptoms among youth with chronic pain while adjusting for covariates including age, sex, ethnicity, primary caregivers’ education level, overweight status, and household federal poverty level. Results Overall, our results indicated that PA was negatively associated with anxiety and depressive symptoms. Specifically, youth with chronic pain who engaged in at least 60–minute PA for 1–3 days, 4–6 days, or every day reported significantly lower likelihood of experiencing symptoms of anxiety (OR = 0.71, 95% CI: 0.60–0.84; OR = 0.44, 95% CI: 0.36–0.53; OR = 0.50, 95% CI: 0.40–0.63, respectively; all p -value mptoms compared to those with 0 days. Conversely, SB (operationalized via the proxy sc

关键词： Physical activity screen time depression anxiety physical pain

A Eulerian population balance/monte Carlo approach for simulating laminar aluminum dust flames

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Particuology 2024年第5期88卷 323-343页

作者： fabian Sewerin Jannis Finke Emmy Noether Group for Dispersed multiphase Flows Chair of Mechanical Process EngineeringOtto-von-Guericke-Universität MagdeburgUniversitätsplatz 239106 MagdeburgGermany

Recently,metal powders have been conceptualized as carbon-free recyclable energy carriers that may form a cornerstone of a sustainable energy *** combustion of metal dusts in oxidizing atmospheres is exothermal and yields oxide particles that could,potentially,be retrieved and,subsequently,recharged by conversion to pure metals using green primary energy *** a step towards a predictive tool for designing metal dust combustors,we present a fully Eulerian modelling approach for laminar particle-laden reactive flows that is,conceptually,based on a population balance description of the dispersed particles and relies on a stochastic Eulerian solution *** the population balance equation(PBE)is formulated for the number-weighted distribution of characteristic properties among all particles near a spatial location,it is kinetically informed by the rates at which mass,momentum and heat are exchanged between the carrier gas and the particulate phase on the single particle *** the scope of the Eulerian monte Carlo solution scheme,the property distribution is discretely represented in terms of the total number density and a finite number of property samples and the computational work is channelled towards the Eulerian estimation of mean particle *** the case of reactive aluminum particles,we combine a kinetic description of the gas-particle heat and mass transfer with a transport-limited continuum formulation to obtain rate expressions that are valid across the entire particle size range from the free molecular through the continuum *** velocity,the particle properties include only the particle mass,temperature and oxide mass *** set of thermochemical degrees of freedom is retained also as phase transitions due to melting occur,drawing on a smooth blend of the solid and liquid thermodynamic and material *** particle-level formulation encompasses aluminum evaporation,surface oxidation,scavenging of oxi

关键词： metal dust combustion Aluminum Population balance Eulerian monte Carlo

Freeform imaging systems:Fermat's principle unlocks"first time right"design

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Light(Science & Applications) 2021年第6期10卷 1029-1040页

作者： fabian Duerr Hugo Thienpont Brussels Photonics Department of Applied Physics and Photonics(B-PHOT TONA)Vrije Universiteit BrusselPleinlaan 21050 BrusselsBelgium

For more than 150 years,scientists have advanced aberration theory to describe,analyze and eliminate imperfections that disturb the imaging quality of optical components and ***,they have developed optical design methods for and manufacturing techniques of imaging systems with ever-increasing complexity and performanee up to the point where they are now including optical elements that are unrestricted in their surface *** so-called optical freeform elements offer degrees of freedom that can greatly extend the functionalities and further boost the specifications of state-of-the-art imaging ***,the drastically increased number of surface coefficients of these freeform surfaces poses severe challenges for the optical design process,such that the deployme nt of freeform optics remained limited until *** this paper,we present a deterministic direct optical design method for freeform imaging systems based on differential equations derived from Fermats principle and solved using power *** method allows calculating the optical surface coefficients that ensure minimal image blurring for each individual order of *** demonstrate the systematic,deterministic,scalable,and holistic character of our method with catoptric and catadioptric design *** such we introduce a disruptive methodology to design optical imaging systems from scratch,we largely reduce the "trial-and-error",approach in present-day optical design,and we pave the way to a fast-track uptake of freeform elements to create the nextgeneratio n high-end *** include a user application that allows users to experience this unique design method hands-on.

关键词： optics eliminate design

machine-learning assisted design principle search for singlet fission:an example study of cibalackrot

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npj Computational materials 2022年第1期8卷 1703-1716页

作者： fabian Weber Hirotoshi mori Department of Applied Chemistry Chuo University112-8551 Tokyo-toBunkyo-kuKasuga1-13-27Japan Department of Theoretical and Computational molecular Science Institute for Molecular ScienceOkazaki444-8585Japan

This work uses quantum chemistry calculations and machine learning to explore design rules for singlet fission in a chemical space of four million indigoid *** identify~400,000 derivatives of 2,2′-diethenyl cibalackrot,which theoretically fulfil the energy conditions for exoergic singlet fission above the silicon band gap *** this database with a random forest classifier,we observe that small substituents with positive mesomeric effects and weak negative inductive effects reinforce the desired energetic conditions when placed at specific ***,a subset of molecules that reflects the random forest classifier’s rules are investigated for their quantum chemical properties to translate the desirable structural motifs into wavefunction-based design ***,direct correlations between the energetic condition for singlet fission,the biradical character and the charge and triplet spin density in prominent molecular regions are identified,providing insights that may serve as a guide for singlet fission core structure development.

关键词： singlet quantum classifier

Investigation of grain mass flow in a mixed flow dryer

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Particuology 2014年第1期12卷 33-39页

作者： fabian Weigler Jochen mellmann Department of Post-harvest Technology Leibniz Institute for Agricultural Engineering Potsdam-Bornim

The numerical modeling of grain drying is a topic of great relevance to post-harvest engineering. The required type of drying process depends on the quantity of grain to be dried and the required quality of the grain. The choice of the drying system depends on the operating parameters of the drying process. The granular flow pattern of the material exerts a significant influence on the drying process. Post-harvest drying of grain is essential for better storage, handling, and processing. Therefore, it is important to know the material behavior that controls the particle flow patterns of grain in the drying equipment to guarantee the product quality and to optimize the drying process conditions. The discrete element method （DEm） was applied to investigate the particle flow pattern of wheat through a mixed-flow dryer （mFD） without airflow, and the findings were compared with experimental results in this work. The investigations were performed using dry wheat with 14 wb% moisture content.

关键词： Keywords:mixed-flow dryerGrain mass flowDiscrete element method

Adaptive nonlinear model predictive control design of a flexible-link manipulator with uncertain parameters

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Acta mechanica Sinica 2017年第3期33卷 529-542页

作者： fabian Schnelle Peter Eberhard Institute of Engineering and Computational mechanics University of Stuttgart

This paper presents a novel adaptive nonlinear model predictive control design for trajectory tracking of flexible-link manipulators consisting of feedback linearization, linear model predictive control, and unscented Kalman filtering. Reducing the nonlinear system to a linear system by feedback linearization simplifies the optimization problem of the model predictive controller significantly, which, however, is no longer linear in the presence of parameter uncertainties and can potentially lead to an undesired dynamical behaviour. An unscented Kalman filter is used to approximate the dynamics of the prediction model by an online parameter estimation, which leads to an adaptation of the optimization problem in each time step and thus to a better prediction and an improved input action. Finally, a detailed fuzzy-arithmetic analysis is performed in order to quantify the effect of the uncertainties on the control structure and to derive robustness assessments. The control structure is applied to a serial manipulator with two flexible links containing uncertain model parameters and acting in three-dimensional space.

关键词： model predictive control Feedback linearization Unscented Kalman filter Flexible-link manipulator Fuzzy-arithmetical analysis

Extreme Cities and Isotropic Territories: Scenarios and Projects Arising from the Environmental Emergency of the Central Veneto Città Diffusa

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International Journal of Disaster Risk Science 2012年第1期3卷 11-22页

作者： Lorenzo fabian Department of Urbanism University IUAV of Venice(Istituto Universitario di Architettura di Venezia)30125 VeniceItaly

In Italy extreme cities and territories occur at the extremities of lagoons,coastlines,and river deltas,in hydraulically reclaimed and hydrogeologically instable areas,and those where the water supply network has been placed underground,channeled into piping,or removed altogether. These areas are now increasingly subject to natural calamities and extreme weather conditions,and the consequences of climate change and the fragility of the more and more impermeable and urbanized land surface are clearly evident. Isotropic territories are characterized by weak hierarchization of infrastructure and settlement. The metropolitan area of Venice,aptly described as a diffuse city(città diffusa),and other diffusely organized territories characterized by settlement dispersion are good examples of this phenomenon. This article reviews recent research at the University IUAV of Venice in a study on climate change and water forms,a project in which the profound relations between water networks,the geological nature of the terrain,forms of urbanization,and energy saving are tested out. The study of the territories of the Venetian metropolitan area provides a series of initial working hypotheses as to how the ongoing environmental emergency can become an opportunity for a development project of the city and the territory,capable of structuring its various parts differently.

关键词： extreme consequences underground