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Transfer learning applications for autoencoder-based anomaly detection in wind turbines

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Energy and AI 2024年第3期17卷 1-10页

作者： Cyriana M.A.Roelofs Christian Gück Stefan Faulstich Fraunhofer IEE Joseph-Beuys-Straße 834117 KasselGermany

Anomaly detection in wind turbines typically involves using normal behaviour models to detect faults *** behaviour models are often implemented through the use of neural networks,of which autoencoders are particularly popular in this ***,training autoencoder models for each turbine is time-consuming and resource ***,transfer learning becomes essential for wind turbines with limited data or applications with limited computational *** study examines how cross-turbine transfer learning can be applied to autoencoder-based anomaly ***,autoencoders are combined with constant thresholds for the reconstruction error to determine if input data contains an *** models are initially trained on one year’s worth of data from one or more source wind *** are then fine-tuned using small amounts of data from the target wind *** methods for fine-tuning are investigated:adjusting the entire autoencoder,only the decoder,or only the threshold of the *** performance of the transfer learning models is compared to baseline models that were trained on one year’s worth of data from the target wind *** results of the tests conducted in this study indicate that models trained on data of multiple wind turbines do not improve the anomaly detection capability compared to models trained on data of one source wind *** addition,modifying the model’s threshold can lead to comparable or even superior performance compared to the baseline,whereas fine-tuning the decoder or autoencoder further enhances the models’performance.

关键词： Condition monitoring Transfer learning Autoencoder Anomaly detecti on Wind turbines Fault detection

Magnetic properties of Fe_(3(1-x))Cr_(3x)C alloys

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International journal of Minerals,Metallurgy and Materials 2009年第3期16卷 314-316页

作者： Feng-qi Zhao O. Tegus B. Fuquan E. Brück Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials College of Physics and Electron Information Inner Mongolia Normal University Hohhot 010022 China Van der Waals-Zeeman Instituut Universiteit van Amsterdam Valckenierstraat 65 1018XE Amsterdam Netherlands

The magnetic properties of Fe3（1-x）Cr3xC alloys with x=0.05, 0.1, 0.15, and 0.2, which crystallize in the cementite Fe3C-type structure with space group Pnma, were investigated by means of magnetization measurements. These alloys show temperature-induced second-order magnetic phase transitions. The Curie temperature （Tc） of these alloys decreases with increasing x. The isothermal magnetic-entropy changes of these alloys were derived from the magnetic isotherms measured with increasing temperature and increasing field. The maximum values of the magnetic-entropy change are about 0.9 and 3.6 j·kg^-1·K^-1 at Tc =360 K for x = 0.05 in a magnetic field change from 0 to 1 T and 0 to 5 T, respectively.

关键词： magnetic properties magnetocaloric effect magnetic-entropy change magnetic refrigeration

No evidence for increased cell entry or antibody evasion by Delta sublineage AY.4.2

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Cellular & Molecular Immunology 2022年第3期19卷 449-452页

作者： Prerna Arora Amy Kempf Inga Nehlmeier Luise Graichen Martin S.Winkler Martin Lier Sebastian Schulz Hans-Martin j.ck Stefan Pöhlmann Markus Hoffmann Infection Biology Unit German Primate CenterKellnerweg 437077GöttingenGermany Faculty of Biology and Psychology Georg-August-University GöttingenWilhelmsplatz 137073GöttingenGermany Department of Anesthesiology University of Göttingen Medical CenterGeorg-August University GöttingenRobert-Koch-Straße 4037075GöttingenGermany Division of Molecular Immunology Department of Internal Medicine 3Friedrich-Alexander University Erlangen-NürnbergGlückstraße 691054ErlangenGermany

Since the beginning of the COVID-19 pandemic,multiple SARS-CoV-2 variants have *** some variants spread only locally,others,referred to as variants of concern,disseminated globally and became drivers of the *** SARS-CoV-2 variants harbor mutations relative to the virus circulating early in the pandemic,and mutations in the viral spike(S)protein are considered of particular relevance since the S protein mediates host cell entry and constitutes the key target of the neutralizing antibody *** a consequence,mutations in the S protein may increase SARS-CoV-2 infectivity and enable its evasion of neutralizing ***,mutations in the S protein can modulate viral transmissibility and pathogenicity.

关键词： SARS-CoV-2 AY.4.2 Delta Host cell entry Antibody evasion

Comparative analysis of Solanum stoloniferum responses to probing by the green peach aphid Myzus persicae and the potato aphid Macrosiphum euphorbiae

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Insect Science 2013年第2期20卷 207-227页

作者： Adriana E. Alvarez Viviana G. Broglia Anahi M. Alberti D'Amato Doret Wouters Edwin van der vossen Elisa Garzo W. Fred Tjallingii Marcel Dicke Ben Vosman Laboratory of Entomology Wageningen University P.O. Box 8031 6700 EH 2Plant Breeding Wageningen UR P.O. Box 386 6700 AAWageningen The Netherlands Plant Breeding Wageningen UR P.O. Box 386 6700 AA Wageningen The Netherlands

Plants protect themselves against aphid attacks by species-specific de- fense mechanisms. Previously, we have shown that Solanum stoloniferum Schlechtd has resistance factors to Myzus persicae Sulzer （Homoptera： Aphididae） at the epidermal/mesophyll level that are not effective against Macrosiphum euphorbiae Thomas （Homoptera： Aphididae）. Here, we compare the nymphal mortality, the pre-reproductive development time, and the probing behavior of M. persicae and M. euphorbiae on S. stoloniferum and Solanum tuberosum L. Furthermore, we analyze the changes in gene expression in S. stoloniferum 96 hours post infestation by either aphid species. Although the M. euphorbiae probing behavior shows that aphids encounter more probing constrains on phloem activities-longer probing and salivation time- on S. stoloniferum than on S. tuberosum, the aphids succeeded in reaching a sustained ingestion of phloem sap on both plants. Probing by M. persicae on S. stoloniferum plants resulted in limited feeding only. Survival of M. euphorbiae and M. persicae was affected on young leaves, but not on senescent leaves of S. stoloniferum. Infestation by M. euphorbiae changed the expression of more genes than M. persicae did. At the systemic level both aphids elicited a weak response. Infestation orS. stoloniferum plants with a large number ofM. persicae induced morphological changes in the leaves, leading to the development of pustules that were caused by disrupted vascular parenchyma and surrounding tissue. In contrast, an infesta- tion by M. euphorbiae had no morphological effects. Both plant species can be regarded as good host for M. euphorbiae, whereas only S. tuberosum is a good host for M. persicae and S. stoloniferum is not. Infestation ofS. stoloniferum by M. persicae or M. euphorbiae changed the expression of a set of plant genes specific for each of the aphids as well as a set of common genes.

关键词： cDNA microarrays electrical penetration graph insect-plant interactions,Solanum tuberosum wild potato

Petrology of ultramafic to mafic cumulate rocks from the G?ksun(Kahramanmaras) ophiolite,southeast Turkey

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Geoscience Frontiers 2020年第1期11卷 109-128页

作者： Osman Parlak Utku Bagcı Tamer Rızaoglu Corina Ionescu GüzideÖnal Volker Höck Hüseyin Kozlu Çukurova Universitesi Jeoloji Mühendisligi BölümüBalcalıTR-01330 AdanaTurkey State Key Laboratory of Geological Processes and Mineral Resources Center for Global TectonicsSchool of Earth SciencesChina University of GeosciencesWuhan 430074China Mersin Universitesi Jeoloji Mühendisligi BölümüÇiftlikköyTR-33343 MersinTurkey Kahramanmaras¸SütçüImam Universitesi Jeoloji Mühendisligi BölümüAvs¸ar KampüsüTR-46100 KahramanmarasTurkey Babes-Bolyai University Geology Department1 Kogalniceanu Str.RO-400084 Cluj-NapocaRomania Kazan(Volga Region)Federal University Archeotechnologies&Archeological Material Sciences Laboratory18 Kremlevskaya Str.420000 KazanRussia University of Salzburg Division of Geography and Geology34 Hellbrunner Str.A-5020 SalzburgAustria Türkiye Petrolleri Anonim Ortaklıgı TR-06520 AnkaraTurkey

The G?ksun(Kahramanmaras)ophiolite(GKO),cropping out in a tectonic window bounded by the Malatya metamorphic unit on both the north and south,is located in the EW-trending lower nappe zone of the southeast Anatolian orogenic belt(Turkey).It exhibits a complete oceanic lithospheric section and overlies the Middle Eocene Maden Group/Complex with a tectonic contact at its *** ophiolitic rocks and the tectonically overlying Malatya metamorphic(continental)unit were intruded by I-type calc-alkaline Late Cretaceous granitoid(~81-84 Ma).The ultramafic to cumulates in the GKO are represented by wehrlite,plagioclase wehrlite,olivine gabbro and *** crystallization order for the cumulate rocks is as follows:olivine±chromian spinel→clinopyroxene→*** major and trace element geochemistry as well as the mineral chemistry of the ultramafic to mafic cumulate rocks suggest that the primary magma generating the GKO is compositionally similar to that observed in the modern island-arc tholeiitic *** mineral chemistry of the ultramafic to mafic cumulates indicates that they were derived from a mantle source that was previously depleted by earlier partial melting *** highly magnesian olivine(Fo77-83),clinopyroxene(Mg#of 82-90)and the highly Ca-plagioclase(An81-89)exhibit a close similarity to those,which formed in a supra-subduction zone(SSZ)*** field and the geochemical evidence suggest that the GKO formed as part of a much larger sheet of oceanic lithosphere,which accreted to the base of the Tauride active continental margin,including the ispendere,K?mürhan and the Guleman *** latter were contemporaneous and genetically/tectonically related within the same SSZ setting during the closure of the Neotethyan oceanic basin(Berit Ocean)between the Taurides to the north and the Bitlis-Pütürge massif to the south during the Late Cretaceous.

关键词： Göksun(Kahramanmaras)ophiolite Cumulate SSZ-Spreading Neotethys Late Cretaceous SE Anatolia

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等离子体刻蚀和沉积中的辉光放电现象

压电与声光 1980年第4期 67-71+73页

作者： j.L.vossen 杨清宗美国无线电公司研究所

评述了在等离子体刻蚀和沉积中会引起沾污,辐射损伤或表面轰击损伤的光辉放电的物理效应.用内外电极的反应器的效应是不同的,除了测量各种系统的电位以外,还分析了两种反应器中重要区域的电条件.证实了以下两点:基片、内壁和内电极的作... 详细信息

评述了在等离子体刻蚀和沉积中会引起沾污,辐射损伤或表面轰击损伤的光辉放电的物理效应.用内外电极的反应器的效应是不同的,除了测量各种系统的电位以外,还分析了两种反应器中重要区域的电条件.证实了以下两点:基片、内壁和内电极的作用如同射频溅射的靶;而测得的电位与反应器的几何形状及工作条件有关.还提供了减少沾污和损伤的方法.

关键词：辉光放电基片内壁衬底等离子体刻蚀

Influence of the number of flights on the dilute phase ratio in flighted rotating drums by PTV measurements and DEM simulations

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Particuology 2021年第3期19卷 171-182页

作者： Lanyue Zhang Zhaochen jiang jochen Mellmann Fabian Weigler Fabian Herz Andreas Bück Evangelos Tsotsas Department of Postharvest Technology Leibniz Institute for Agricultural Engineering and BioeconomyMax-Eyth-Allee 100Potsdam 14469Germany Thermal Process Engineering Otto von Guericke University MagdeburgUniversitaetsplatz 239106 MagdeburgGermany Institute of Particle Technology(LFG) FAU Erlangen-NurembergCauerstr.491058 ErlangenGermany Department of Applied Biosciences and Process Engineering Anhalt University of Applied SciencesBernburgerStr.5506366 KoethenGermany

Particle distribution in the cross-section of the flighted rotating drum(FRD)is critical to the analysis of heat and mass transfer between gas and *** this work,the particle tracking velocimetry(PTV)method is applied to study the influence of the number of flights on the particle motion in *** drum,installed with 1,4,8,or 12 rectangular flights,is filled with plastic balls to 15%and operated at various rotating speeds ranging from 10 rpm to 30 *** results show that the number of flights has different effects on the holdup ratio and cascading rate of single flight and active *** 8 and 12 flights,the FRD produces a larger and more stable particle ratio of the dilute ***,DEM simulations agree with PTV measurements,whereas literature models show significant deviations.

关键词： Flighted rotating drum Number of flights Dilute phase PTV DEM

奥钢联Schienen公司在累奥本/多纳维茨新建现代化钢轨轧机

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钢铁 2006年第10期41卷 82-86页

作者： H.Pfeiler N.Kck j.Schrder L.Maestrutti 杨秋霜奥钢联Schienen公司

介绍了奥钢联Schienen公司在累奥本/多纳维茨新建的现代化钢轨轧机的设备情况及其技术特点。该轧机在轧制钢轨时采用万能轧制模式。这种轧制模式与SCC机芯概念机架的组合,可获得极高的产品加工精度,使钢轨成品表面质量更好,延长轧辊使... 详细信息

介绍了奥钢联Schienen公司在累奥本/多纳维茨新建的现代化钢轨轧机的设备情况及其技术特点。该轧机在轧制钢轨时采用万能轧制模式。这种轧制模式与SCC机芯概念机架的组合,可获得极高的产品加工精度,使钢轨成品表面质量更好,延长轧辊使用寿命,使钢轨对称成形,降低内应力。

关键词：钢轨轧机达涅利技术特点

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防渗膜集成永久性渗漏监控系统的定位

环境工程学报 2017年第5期11卷 3320-3326页

作者：刘宁 GEUTEBRück Ernst RAMSEY Boyd 上海交通大学船舶海洋与建筑工程学院上海200240 Texplor GmbH Potsdam 14478 GSE Environmental Houston 77073

介绍了由导电HDPE防渗膜和预埋渗漏监控模块共同构成的集成永久性防渗膜渗漏监控系统及其基本工作原理,阐述了第3代导电防渗膜以及渗漏监控模块的特点,重点介绍了在贵州省环境保护厅监督下进行的我国第1次防渗膜永久监控系统现场验证实... 详细信息

介绍了由导电HDPE防渗膜和预埋渗漏监控模块共同构成的集成永久性防渗膜渗漏监控系统及其基本工作原理,阐述了第3代导电防渗膜以及渗漏监控模块的特点,重点介绍了在贵州省环境保护厅监督下进行的我国第1次防渗膜永久监控系统现场验证实验,就实验场地规划、导电防渗膜的安装与检测、渗漏监控模块的安装、系统调试和实验过程分别做了说明。实验结果表明,监控系统可以对直径1 cm的小孔渗漏发出实时报警信号,定位的漏点与实际漏点间的差距仅为0.68 m,相对于1 405 m^2的实验区域,定位精度达到了1/1 000,显示了极高的敏感度和良好的渗漏定位能力。该现场验证实验的成功,对于建立有效的填埋场环境监控系统有着积极的影响。

关键词：防渗膜渗漏监控渗漏定位验证实验