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Experimental qualification and sensitivity study of antipodal patch antenna structures for orientation independent detection of partial discharges

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HIGH VOLTAGE 2024年第3期9卷 674-684页

作者： Friebe, Kerstin Jenau, Frank tu dortmund univ Inst High Voltage Engn Dortmund Germany

Partial discharge diagnosis is an important part of monitoring and diagnosing components of the power transmission system. Four different patch antenna structures for the detection of partial discharges are investigated. These patch antennas, which are realisable in a variety of geometric structures, are already the subject of research. They offer the advantage of contactless detection without intervention in the test object or the measuring circuit, and also offer the possibility of alignment independent detection compared to directional antennas. However, it is important and required to examine different structures extensively at the same measurement setup and to compare their performance. To achieve this, four different configurations of patch antenna structures based on basic geometries all in antipodal design are realised: a logarithmic periodic structure, a Hilbert fractal structure and two tapered slot antennas. They are exposed to the same conditions on a special and unique measurement setup. As the main aspect, the performance of orientation independent detection of partial discharges patch antennas with varying distance and rotation in relation to the partial discharge source as well as the operating bandwidth is examined. To rate the structures, an evaluation scheme is created and a sensitivity matrix is generated.

关键词： orientation independent detection contactless detection special measurement setup microstrip antennas partial discharge source Hilbert fractal structure antipodal design Charge measurement partial discharge diagnosis diagnosing components measuring circuit unique measurement setup antipodal patch antenna structures alignment independent detection Single antennas tapered slot antennas directional antennas partial discharge measurement partial discharges patch antennas directive antennas power transmission system Dielectric breakdown and discharges logarithmic periodic structure different patch antenna structures antenna radiation patterns geometric structures slot antennas fractals partial discharges

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Impact of the spindle number on the material transport and mixing during planetary roller melt granulation Author links open overlay panel

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Particuology 2024年第8期91卷 260-267页

作者： Tom Lang Jens Bartsch Laboratory of Solids Process Engineering Department of Biochemical and Chemical EngineeringTU Dortmund University44227DortmundGermany

In comparison to the established twin-screw machines,the application of a planetary roller granulator for continuous operation of melt granulation is a promising alternative based on the unique process *** initial study focused on the material transport during processing as a key driver for the overall ***,the impact of direct process parameters on the residence time distribution was the main *** investigations are complemented in this study by considering the free processing volume,which is defined by the number of planetary spindles applied within a *** impact on the processing conditions is evaluated with respect to the process setting in terms of feed rate and rotation *** results highlight the potential of altering the underlying transport function in planetary roller melt granulation(PRMG)via the investigated direct process and equipment *** impact of the feed rate is lower in comparison,while a higher rotation speed as well as a higher free processing volume promote material ***,a normalization of the determined residence time distribution(RTD)model data was feasible with respect to the process settings and the number of applied planetary spindles in the processing *** demonstrates the key role of the free processing volume in the fundamental mechanisms of material transport and mixing during PRMG.

关键词： Continuous manufacturing Melt granulation Planetaryroller granulator Quality-by-Design Residence time Material mixing

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Impact of exercise on markers of B cell-related immunity:A systematic review

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Journal of Sport and Health Science 2024年第3期13卷 339-352,I0002页

作者： David Walzik Sergen Belen Karen Wilisch Marie Kupjetz Silvana Kirschke Tobias Esser Niklas Joisten Alexander Schenk Sebastian Proschinger Philipp Zimmer Division of Performance and Health(Sports Medicine) Institute for Sport and Sport ScienceTU Dortmund UniversityDortmund 44227Germany

Background:B cells represent a crucial component of adaptive immunity that ensures long-term protection from infection by generating pathogen-specific *** alters B cell counts and immunoglobulin levels,but evidence-based conclusions on potential benefits for adaptive immunity are *** systematic review assessed current literatures on the impact of acute exercise and exercise training on B cells,immunoglobulins,and markers of secretory immunity in human ***:According to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses(PRISMA)guidelines,MEDLINE,Web of Science,and Embase were searched on March 8,***-randomized controlled trials and crossover trials investigating the impact of acute exercise or exercise training on B cell counts and proportions,immunoglobulin levels,salivary flow rate,or secretory immunoglobulin A secretion rate were *** and reporting of exercise training studies were assessed using the Tool for the Assessment of Study Quality and reporting in *** characteristics,outcome measures,and statistically significant changes were summarized ***:Of the 67 eligible studies,22 applied acute exercise and 45 applied exercise *** included outcomes revealed significant alterations over time in acute exercise and exercise training context,but only a few investigations showed significant differences compared to control *** and plasma immunoglobulin A levels were most consistently increased in response to exercise ***:B cell-related outcomes are altered by acute exercise and exercise training,but evidence-based conclusions cannot be drawn with high confidence due to the large heterogeneity in populations and exercise ***-designed trials with large sample sizes are needed to clarify how exercise shapes B cell-related immunity.

关键词： Antibody B-lymphocyte Exercise Humoral immunity Immune system

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Expedition to the blockchain application potential for higher education institutions

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BLOCKCHAIN-RESEARCH AND APPLICATIONS 2024年第3期5卷 53-66页

作者： Gottlieb, Matthias Deutsch, Christina Hoops, Felix Pongratz, Hans Krcmar, Helmut Bavarian Minist Digital Affairs D-80333 Munich Germany Tech univ Munich D-85478 Garching Germany tu dortmund univ D-44139 Dortmund Germany

In the education sector, blockchain is currently at the end of the peak of inflated expectations in Gartner's Hype Cycle. Thus, it is crucial to understand whether this technology meets the expectations of Higher Education Institutions (HEIs). We go on an expedition to identify blockchain application scenarios and its potential for HEI administration-the universities are digitalized to just 23.3%. Current information systems research addresses classifications of blockchain-based projects (application level) rather than their technical realization (protocol level). Thus, when evaluating blockchain application scenarios in HEI administration, we intensively consider the technical side of blockchain-based projects. We perform a three- step approach: (1) systematic literature review, (2) qualitative exploratory semi-structured interviews to supplement information on market-ready solutions, and (3) an evaluation of the potential of the blockchain-based projects identified, based on HEI administration requirements. We find that the leading blockchain application scenarios are credential verification and record-sharing. At the protocol level, we obtain equivocal results regarding the technical realization of projects, e.g., their underlying blockchain types and storage models. At the application level, when discussing the potential of different projects, we find that most of them address adaptability, complexity decomposition, and cost reduction requirements between HEIs; interest diversity and stakeholder collaboration between HEIs and business actors; privacy and trust between HEIs and students.

关键词： Blockchain Higher education institution (HEI) Administration Protocol level Application level Application

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Mechanically Joined Extrusion Profiles for Battery Trays

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Automotive Innovation 2024年第1期7卷 182-193页

作者： Florian Kneuper Stefan Neumann AndréSchulze Mortaza Otroshi A.Erman Tekkaya Gerson Meschut Institute of Forming Technology and Lightweight Components(IUL) TU Dortmund University44227 DortmundGermany Laboratory for Material and Joining Technology(LWF) Paderborn UniversityPaderbornGermany

In the context of electromobility,ensuring the leak tightness of assemblies is of paramount importance,particularly in bat-tery *** battery housings,often featuring base assemblies crafted from extruded aluminum profiles,address the challenge of leak tightness at joints through methods like friction stir welding,a process known for its time and cost *** aim of this study is to develop and implement a new type of extruded profile concept to produce tight base assemblies for battery housings by a longitudinal mechanical single stroke joining *** geometry,the process and the properties of the aluminum profiles are investigated to get a joint that meets the tightness requirements and achieve high load-bearing capacities in agreement with the high homologation requirements set to vehicles with high-voltage *** joint is formed by means of a single stage press stroke,which eliminates the need for complex tool designs that are neces-sary for continuous joining(roll joining).Flat steel contact surfaces are used as joining *** evaluate the joint quality,force curves from the joining process are analyzed and the resulting joint geometries are assessed using *** resulting leak tightness of the linear joints is measured by a helium sniffer leak detector and the load-bearing capacities are investigated by shear lap and bending tests and fatigue strength *** study also explores whether a difference in strength between the two joining partners has a positive effect on the joint properties.

关键词： Joining by plastic deformation Aluminum Leak Tightness

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Molecular insights of exercise therapy in disease prevention and treatment

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Signal Transduction and Targeted Therapy 2024年第6期9卷 2564-2597页

作者： David Walzik Tiffany Y.Wences Chirino Philipp Zimmer Niklas Joisten Division of Performance and Health(Sports Medicine) Institute for Sport and Sport ScienceTU Dortmund University44227 DortmundNorth Rhine-WestphaliaGermany Division of Exercise and Movement Science Institute for Sport ScienceUniversity of Göttingen37075 GöttingenLower SaxonyGermany

Despite substantial evidence emphasizing the pleiotropic benefits of exercise for the prevention and treatment of various diseases,the underlying biological mechanisms have not been fully *** exercise benefits have been attributed to signaling molecules that are released in response to exercise by different tissues such as skeletal muscle,cardiac muscle,adipose,and liver *** signaling molecules,which are collectively termed exerkines,form a heterogenous group of bioactive substances,mediating inter-organ crosstalk as well as structural and functional tissue *** scientific endeavors have focused on identifying and characterizing new biological mediators with such ***,some investigations have focused on the molecular targets of exerkines and the cellular signaling cascades that trigger adaption processes.A detailed understanding of the tissue-specific downstream effects of exerkines is crucial to harness the health-related benefits mediated by exercise and improve targeted exercise programs in health and ***,we review the current in vivo evidence on exerkine-induced signal transduction across multiple target tissues and highlight the preventive and therapeutic value of exerkine signaling in various *** emphasizing different aspects of exerkine research,we provide a comprehensive overview of(i)the molecular underpinnings of exerkine secretion,(ii)the receptor-dependent and receptor-independent signaling cascades mediating tissue adaption,and(iii)the clinical implications of these mechanisms in disease prevention and treatment.

关键词： prevention treatment collective

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Nonlinear Rydberg exciton-polaritons in Cu2O microcavities

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Light(Science & Applications) 2024年第4期13卷 619-627页

作者： Maxim Makhonin Anthonin Delphan Kok Wee Song Paul Walker Tommi Isoniemi Peter Claronino Konstantinos Orfanakis Sai Kiran Rajendran Hamid Ohadi Julian Heckötter Marc Assmann Manfred Bayer Alexander Tartakovskii Maurice Skolnick Oleksandr Kyriienko Dmitry Krizhanovskii Department of Physics and Astronomy University of SheffieldSheffield S37RHUK. Department of Physics and Astronomy University of ExeterStocker RoadExeter EX44PYUK. SUPA School of Physics and AstronomyUniversity of St AndrewsSt Andrews KY169SSUK. Fakultät Physik TU DortmundAugust-Schmidt-Straße 444227 DortmundGermany

Rydberg excitons(analogues of Rydberg atoms in condensed matter systems)are highly excited bound electron-hole states with large Bohr *** interaction between them as well as exciton coupling to light may lead to strong optical nonlinearity,with applications in sensing and quantum information ***,we achieve strong effective photon–photon interactions(Kerr-like optical nonlinearity)via the Rydberg blockade phenomenon and the hybridisation of excitons and photons forming polaritons in a Cu2O-filled *** pulsed resonant excitation polariton resonance frequencies are renormalised due to the reduction of the photon-exciton coupling with increasing exciton *** analysis shows that the Rydberg blockade plays a major role in the experimentally observed scaling of the polariton nonlinearity coefficient as∝n4.4±1.8 for principal quantum numbers up to n=*** high principal quantum numbers studied in a polariton system for the first time are essential for realisation of high Rydberg optical nonlinearities,which paves the way towards quantum optical applications and fundamental studies of strongly correlated photonic(polaritonic)states in a solid state system.

关键词： density Rydberg polar

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Efficient slope reliability analysis under soil spatial variability using maximum entropy distribution with fractional moments

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1140-1152页

作者： Chengxin Feng Marcos A.Valdebenito Marcin Chwała Kang Liao Matteo Broggi Michael Beer Institute for Risk and Reliability Leibniz University HannoverCallinstr.34Hannover30167Germany Chair for Reliability Engineering TU Dortmund UniversityLeonhard-Euler-Str.5Dortmund44227Germany Faculty of Civil Engineering Wrocƚaw University of Science and TechnologyWrocƚawPoland Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu610031China university of Liverpool Institute for Risk and UncertaintyPeach StreetLiverpoolL69 7ZFUnited Kingdom International Joint Research Center for Resilient Infrastructure & International Joint Research Center for Engineering Reliability and Stochastic Mechanics Tongji UniversityShanghaiChina

Spatial variability of soil properties imposes a challenge for practical analysis and design in geotechnical *** latter is particularly true for slope stability assessment,where the effects of uncertainty are synthesized in the so-called probability of *** probability quantifies the reliability of a slope and its numerical calculation is usually quite involved from a numerical *** view of this issue,this paper proposes an approach for failure probability assessment based on Latinized partially stratified sampling and maximum entropy distribution with fractional *** spatial variability of geotechnical properties is represented by means of random fields and the Karhunen-Loève ***,failure probabilities are estimated employing maximum entropy distribution with fractional *** application of the proposed approach is examined with two examples:a case study of an undrained slope and a case study of a slope with cross-correlated random fields of strength parameters under a drained *** results show that the proposed approach has excellent accuracy and high efficiency,and it can be applied straightforwardly to similar geotechnical engineering problems.

关键词： Slope Random field Reliability analysis Maximum entropy distribution Latinized partial stratified sampling

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Experimental and computational analysis of the coolant distribution considering the viscosity of the cutting fluid during machining with helical deep hole drills

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Advances in Manufacturing 2022年第2期10卷 235-249页

作者： Ekrem Oezkaya Sebastian Michel Dirk Biermann Institute of Machining Technology Dortmund University of Technology(TU Dortmund)Dortmund 44227Germany

An experimental analysis regarding the distribution of the cutting fluid is very difficult due to the inaccessibility of the contact zone within the bore ***,suitable simulation models are necessary to evaluate new tool designs and optimize drilling *** this paper the coolant distribution during helical deep hole drilling is analyzed with high-speed *** particles are added to the cutting fluid circuit bya developed high-pressure mixing *** the evaluation of suitable particle size,particle concentration and coolant pressure,a computational fluid dynamics(CFD)simulation is validated with the experimental *** comparison shows a very good model quality with a marginal difference for the flow velocity of 1.57%between simulation and *** simulation considers the kinematic viscosity of the *** results show that the fluid velocity in the chip flutes is low compared to the fluid velocity at the exit of the coolant channels of the tool and drops even further between *** velocity and the flow pressure directly at the cutting edge decrease to such an extent that the fluid cannot generate a sufficient cooling or *** the CFD simulation a deeper understanding of the behavior and interactions of the cutting fluid is *** on these results further research activities to improve the coolant supply can be carried out with great potential to evaluate new tool geometries and optimize the machining process.

关键词： Computational fluid dynamics(CFD)analysis:Viscosity-Tracermicro particles Fluidbehavior Helical deep hole drilling

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Point-based tool representations for modeling complex tool shapes and runout for the simulation of process forces and chatter vibrations

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Advances in Manufacturing 2018年第3期6卷 301-307页

作者： P. Wiederkehr T. Siebrecht J. Baumann D. Biermann Institute of Machining Technology TU Dortmund University Dortmund Germany Virtual Machining Department of Computer Science TU Dortmund University Dortmund Germany

Geometric physically-based simulation systemscan be used for analyzing and optimizing complex millingprocesses, for example in the automotive or aerospaceindustry, where the surface quality and process efficiencyare limited due to chatter vibrations. Process simulationsusing tool models based on the constructive solid geometry（CSG） technique allow the analysis of process forces, tooldeflections, and surface location errors resulting from five-axis machining operations. However, modeling complextool shapes and effects like runout is difficult using CSGmodels due to the increasing complexity of the shapedescriptions. Therefore, a point-based method for modelingthe rotating tool considering its deflections is presented inthis paper. With this method, tools with complex shapesand runout can be simulated in an efficient and flexibleway. The new modeling approach is applied to exemplarymilling processes and the simulation results are validatedbased on machining experiments.

关键词： Modeling Tool geometry Milling

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