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Computer vision supported by 3D geometric modelling

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Advances in Manufacturing 2014年第1期2卷 22-31页

作者： sven Fjeldaas Department of Engineering Design and Materials Norwegian University of Science and Technology

This paper suggests four data structures, one based on the other, for a geometric modeller suitable for computer vision. The structures are the key to advance from two-dimensional to three-dimensional automatic picture processing. Three application areas are indicated： one in semisynthetic design of materials, another in measurements of large three-dimensional industrial constructions, and the third one in robotics. There are comments on the software development needed.

关键词： Picture processing 3D geometric modelling Measurements

Choroid plexus imaging to track neuroinflammation—a translational model for mouse and human studies

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Neural Regeneration Research 2023年第3期18卷 521-522页

作者： Muthuraman Muthuraman Mohammadsaleh Oshaghi Vinzenz Fleischer Dumitru Ciolac Ahmed Othman sven G.Meuth Gabriel Gonzalez-Escamilla Sergiu Groppa Department of Neurology Focus Program Translational NeuroscienceRhine Main Neuroscience Network(rmn2)University Medical Center of the Johannes Gutenberg University MainzMainzGermany Department of Neuroradiology University Medical Center of the Johannes Gutenberg University MainzMainzGermany Department of Neurology Medical FacultyHeinrich-Heine-UniversityDüsseldorfGermany

The choroid plexus(ChP)is a highly vascularized and secretory tissue in each of the brain ventricles that represents the key structure between the blood and the cerebrospinal fluid(CSF).Besides its essential role in CSF production and brain waste clearance pathways,the ChP also contributes to the regulation of central nervous system(CNS)immunosurveillance(Ghersi-Egea et al.,2018).Indeed,the ChP forming the blood-CSF barrier(BCSFB)regulates the entry of immune cells and solute molecules into the brain and vice *** antigen-specific,autoreactive immune activation occurs in the periphery,inflammatory cells migrate through the brain barriers towards the CNS(Strominger et al.,2018),initiating neuroinflammatory diseases such as multiple sclerosis(MS).

关键词： al. plexus inflammation

Predictive Tracking Implementation for Mobile Communication Using Programmable Metasurface

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China Communications 2023年第8期20卷 137-152页

作者： Yueheng Li sven Bettinga Lucas Giroto de Oliveira Mohamad Basim Alabd Joerg Eisenbeis Xiang Wan Xueyun Long Tiejun Cui Thomas Zwick Institute of Radio Frequency Engineering and Electronics(IHE) Karlsruhe Institute of TechnologyKarlsruhe 76131Germany Southeast University Nanjing 211100China

The programmable metasurface(PM)is an antenna array architecture that realizes flexible beam *** functionality is achieved by controlling the unit cells designed with micro components such as positive-intrinsic-negative(PIN)diodes,which offers potential cost reductions in the next generation wireless communication *** PM has been a popular topic in antenna design,its implementations in real-time systems accompanied by signal processing algorithms are *** this paper,novel predictive tracking algorithms for mobile communication scenarios using a PM are created and implemented in a real-time system operating at 28 *** angular speed prediction(ASP)algorithm is proposed to compute the position of user equipment(UE)based on the previously recorded beam *** another solution,an angle correction(AC)algorithm is proposed to further improve the prediction and tracking *** a benchmark,the comparisons to a previous PM tracking algorithm without prediction are *** simulation and measurement results show that the prediction algorithms successfully improve the tracking performance,which also prove the feasibilities of PM-based systems to solve complex real-time signal processing problems.

关键词： signal processing mobile communication antenna arrays

Shaping digital earth applications through open innovation - setting the scene for a digital earth living lab

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International Journal of Digital Earth 2014年第7期7卷 594-612页

作者： sven Schade Carlos Granell European Commission Joint Research CentreInstitute for Environment and SustainabilityIspraItaly

Science and policy increasingly request for sustainable development and ***,Digital Earth undergoes a paradigm shift to an open platform that actively supports user *** the public becomes able to contribute new content,we recognize a gap in user-driven validation,feedback and requirements capture,and innovative application *** than defining Digital Earth applications top down,we see a need for methods and tools that will help building applications bottom up and driven by community *** should include a technology toolbox of geospatial and environ-mental enablers,which allow to access functional building blocks and content in multiple ways,but-equally important-enable the collaboration within partially unknown stakeholder *** validation and testing in real-life scenarios will be a central requirement when approaching the Digital Earth 2020 goals,which were articulated *** particularly argue to follow a Living Lab approach for co-creation and awareness rising in relation to environmental and geospatial *** explain why and how such a Digital Earth Living Lab could lead to a sustainable approach for developing,deploying,and using Digital Earth applications and suggest a paradigm shift for Virtual Globes becoming forums for research and innovation.

关键词： sustainable development open innovation stakeholder engagement living laboratories governance methodologies virtual globes

Laser-generated high entropy metallic glass nanoparticles as bifunctional electrocatalysts

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Nano Research 2022年第6期15卷 4807-4819页

作者： Jacob Johny Yao Li Marius Kamp Oleg Prymak Shun-Xing Liang Tobias Krekeler Martin Ritter Lorenz Kienle Christoph Rehbock Stephan Barcikowski sven Reichenberger Technical Chemistry I and Center for Nanointegration Duisburg-Essen(CENIDE) University of Duisburg-EssenEssen 45141Germany Institute for Materials Science Synthesis and Real StructureKiel UniversityKiel 24143Germany Inorganic Chemistry and Center for Nanointegration Duisburg-Essen(CENIDE) University of Duisburg-EssenEssen 45141Germany Electron Microscopy Unit Hamburg University of TechnologyHamburg 21073Germany

High entropy metallic glass nanoparticles(HEMG NPs)are very promising materials for energy conversion due to the wide tuning possibilities of electrochemical potentials offered by their multimetallic character combined with an amorphous *** until now,the generation of these HEMG NPs involved tedious synthesis procedures where the generated particles were only available on highly specialized supports,which limited their widespread ***,more flexible synthetic approaches to obtain colloidal HEMG NPs for applications in energy conversion and storage are highly *** utilized pulsed laser ablation of bulk high entropy alloy targets in acetonitrile to generate colloidal carbon-coated CrCoFeNiMn and CrCoFeNiMnMo HEMG *** in-depth analysis of the structure and elemental distribution of the obtained nanoparticles down to single-particle levels using advanced transmission electron microscopy(TEM),energy-dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD),and Xray photoelectron spectroscopy(XPS)methods revealed amorphous quinary and senary alloy phases with slight manganese oxide/hydroxide surface segregation,which were stabilized within graphitic *** on the catalytic activity of the corresponding carbon-HEMG NPs during oxygen evolution and oxygen reduction reactions revealed an elevated activity upon the incorporation of moderate amounts of Mo into the amorphous alloy,probably due to the defect generation by atomic size ***,we demonstrate the superiority of these carbon-HEMG NPs over their crystalline analogies and highlight the suitability of these amorphous multi-elemental NPs in electrocatalytic energy conversion.

关键词： high entropy alloy pulsed laser ablation in liquid amorphous catalysis oxygen evolution reaction oxygen reduction reaction

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混合分离过程的有序设计框架(英文)

Chinese Journal of Chemical Engineering 2008年第3期16卷 333-342页

作者： Wolfgang Marquardt sven Kossack Korbinian Kraemer Process Systems Engineering and Center for Computational Engineering Science RWTH Aachen University

The design of optimal separation flow sheets for multi-component mixtures is still not a solved problem. This is especially the case when non-ideal or azeotropic mixtures or hybrid separation processes are considered. We review recent developments in this field and present a systematic framework for the design of separation flow sheets. This framework proposes a three-step approach. In the first step different flow sheets are generated. In the second step these alternative flow sheet structures are evaluated with shortcut methods. In the third step a rigorous mixed-integer nonlinear programming (MINLP) optimization of the entire flow sheet is executed to determine the best alternative. Since a number of alternative flow sheets have already been eliminated, only a few optimization runs are necessary in this final step. The whole framework thus allows the systematic generation and evaluation of separation processes and is illustrated with the case study of the separation of ethanol and water.

关键词： process synthesis distillation design rectification body method mixed-integer nonlinear programming

Air pumping for alleviation of heavy smog in Beijing

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Science China Earth Sciences 2018年第7期61卷 973-979页

作者： Yaping SHAO sven ULBRICH Dehui CHEN Institute for Geophysics and Meteorology Department of GeosciencesUniversity of CologneCologne 50923Germany China Meteorological Administration Beijing 100081China

Beijing often suffers under heavy *** such events which occur mostly in autumn and winter,people are desperate for fresh *** formation of heavy smog is due to foremost human induced air pollution,but geographic and meteorological conditions,especially below a surface inversion,play an important *** propose to destroy the inversion by pumping air from above the inversion layer to the surface layer to alleviate the severity of the *** long-term air quality improvement depends on the reduction of air pollution emission,air pumping may provide relief in the interim for the Beijing *** estimate that an air pumping at a rate 2×10~7m^3s^(–1)can lead to significantly improved air quality in Beijing,due to(1)direct clean air input;(2)increased instability and vertical mixing and(3)a positive radiation-mixing *** pumping requires an energy input of 10 GW,comparable with the energy consumption in Beijing for air conditioning in *** propose to use wind energy from Inner Mongolia for the pumping,which has currently an installed wind energy capacity of 70GW.

关键词：空气污染烟雾北京质量改进表面层倒置气象学新鲜

Insights from the degradation mechanism of cyclin D into targeted therapy of the cancer cell cycle

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Signal Transduction and Targeted Therapy 2021年第9期6卷 2607-2608页

作者： Maiwen Caudron-Herger sven Diederichs Division of RNA Biology&Cancer German Cancer Research Center(DKFZ)HeidelbergGermany Division of Cancer Research Department of Thoracic SurgeryMedical Center-University of FreiburgUniversity of FreiburgGerman Cancer Consortium(DKTK)-Partner Site FreiburgFreiburgGermany

The control of cell proliferation is an essential feature in development and tissue homeostasis and is prominently deregulated in *** publications in Nature now uncover the mechanism underlying the degradation of cycl... 详细信息

关键词： targeted homeostasis cancer

Towards Accurate Bit Error Simulation in Wireless Sensor Networks Including Environmental Influences

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Journal of Computer Science & Technology 2020年第4期35卷 809-824页

作者： sven Pullwitt Robert Hartung Ulf Kulau Lars Wolf Institute for Operating Systems and Computer Networks Technische Universitat BraunschweigBraunschweig 38106 Germany

Simulation is a common technique for the evaluation of new approaches and protocols in networked systems and provides many ***,it is also well known that the relevance of the simulation results for real-world applications depends on the various models which are used within the simulation,e.g.,for the characteristics of the radio *** this paper,we introduce the Extended Multipath Raytracing Model,an extension to the ray-tracing radio medium available in Cooja,to improve the modelling of wireless links in simulated Wireless Sensor *** extension allows the simulation of environmental influences onto links on a per node basis,allowing the analysis of various effects observed in experiments in a virtual ***,the packet-based modelling of transmission errors is extended to provide the simulation of bit errors,allowing new usage scenarios,like the simulation of error detection and Forward Error Correction codes in Cooja.

关键词： bit error Contiki Cooja environmental influence simulation wireless sensor network