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Health Monitoring Based on Dynamic Flexibility Matrix: Theoretical Models versus <i>In-Situ</i>Tests

Engineering（科研） 2017年第2期9卷 37-67页

作者： Sebastian Schommer Jean Mahowald Viet Ha Nguyen Danièle Waldmann Stefan Maas arno zürbes Guido De Roeck Université du Luxembourg Faculté des Sciences de la Technologie et de la Communication Research Unit Engineering Sciences Luxembourg Luxembourg Technische Hochschule Bingen Fachbereich 2-Technik Informatik und Wirtschaft Bingen Germany Department of Civil Engineering Division of Structural Mechanics KU Leuven Leuven Belgium

The paper focuses on damage detection of civil engineering structures and especially on concrete bridges. A method for structural health monitoring based on vibrational measurements is presented and discussed. Experimentally identified modal parameters (eigenfrequencies, mode shapes and modal masses) of bridge structures are used to calculate the inverse stiffness matrix, the so-called flexibility matrix. By monitoring of the stiffness matrix, damage can easily be detected, quantified and localized by tracking changes of its individual elements. However, based on dynamic field measurements, the acquisition of the flexibility matrix instead of the stiffness matrix is often the only choice and hence more relevant for practice. But the flexibility-based quantification and localisation of damage are often possible but more difficult, as it depends on the type of support and the location of the damage. These issues are discussed and synthetized, that is an originality of this paper and is believed useful for engineers in the damage detection of different bridge structures. First the theoretical background is briefly repeated prior to the illustration of the differences between stiffness and flexibility matrix on analytical and numerical examples. Then the flexibility-based detection is demonstrated on two true bridges with real-time measurement data and the results are promising.

关键词： Flexibility Damage Detection Bridge Modal Identification

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Implementation and validation of a bonded particle model to predict rheological properties of viscoelastic materials

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Particuology 2024年第6期89卷 198-210页

作者： Michael Mascara arno Mayrhofer Stefan Radl Christoph Kloss Institute of Process and Particle Engineering Graz University of TechnologyInffeldgasse 13Graz8010Austria DCS Computing GmbH Industriezeile 35Linz4020Austria

This work focuses on implementing a particle-based method able to characterize viscoelastic materials whose rheological properties,such as storage modulus G′and loss modulus G″,are *** is based on the bonded particle model,with the elastic constitutive relation here substituted with a viscoelastic one to capture time-scale *** Burgers model,vastly used in literature to model viscoelastic systems,is discretized and *** test case used for calibration comprises of a cubic lattice,sheared with a periodic motion,to mimic the effect of a shear *** appropriate filtering of the stress response,the rheological properties are obtained,highlighting the effect of the lattice geometry,as well as the particle size,on the accuracy of the ***,the Burgers parameters are calibrated by analytically fitting the experimental dataset,showing the limitation of the Burgers *** micro-contact parameters are obtained from the macro parameters through appropriate *** completing a frequency sweep,the simulated G′and G″show a relatively large error,around 25%for G’for *** this reason,a more robust model,namely the generalized Maxwell model,has been *** calibration procedure is performed in the same fashion as for the Burgers ***,the tangential micro-contact parameters are scaled *** normal *** scaling parameter,calledα,is calibrated by minimizing the root mean square error between simulation and experimental data,giving errors below 10%in both G′and G″for a large ***,a full ring plate-plate rheometer setup is simulated,and the simulation is compared with the given experimental dataset,again finding a good agreement.

关键词： DEM Rheology Numerical modeling Viscoelasticity

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Risk of early hepatocellular carcinoma recurrence following liver resection: arbitrary specification or possible target to improve outcome?

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Hepatobiliary Surgery and Nutrition 2024年第4期13卷 745-748页

作者： arno Kornberg Department of Surgery Klinikum rechts der IsarSchool of MedicineTechnical University of MunichMunichGermany

Data from the literature favour liver transplantation(LT)as best curative-intent treatment in patients with early-stage hepatocellular carcinoma(HCC)arising from cirrhosis,as this approach targets both malignancy and the underlying cancerogenic *** strictly adhering to well-defined morphometric tumor burden limits,such as the Milan criteria,excellent recurrence-free survival(RFS)rates beyond 70%at 5 years may be achieved after ***,growing donor liver shortage has significantly increased waiting times and thereby risk of tumor-related dropout from the waiting list,ultimately resulting in inferior survival *** recent years,this critical situation further aggravated by growing evidence that beyond Milan patients may also benefit from LT,when being successfully downstaged by neoadjuvant locoregional interventions like transarterial chemoembolization(TACE)or radiofrequency ablation(RFA)(1).Therefore,even though being associated with an extraordinary risk of HCC recurrence accounting for 50%to 70%,upfront liver resection(LR)still represents the preferred surgical procedure in patients with resectable tumor stage,especially in those who do not suffer from severe portal hypertension.

关键词： Liver resection(LR) hepatocellular carcinoma(HCC) early recurrence late recurrence

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Instance Segmentation of Characters Recognized in Palmyrene Aramaic Inscriptions

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Computer Modeling in Engineering & Sciences 2024年第9期140卷 2869-2889页

作者： Adéla Hamplová Alexey Lyavdansky TomášNovák Ondrej Svojše David Franc arnošt Veselý Czech University of Life Sciences in Prague(CULS) Faculty of Economics and ManagementDepartment of Information EngineeringPrague16500Czech Republic National Research University Higher School of Economics(HSE) Faculty of HumanitiesInstitute for Oriental and Classical StudiesMoscow101000The Russian Federation

This study presents a single-class and multi-class instance segmentation approach applied to ancient Palmyrene inscriptions,employing two state-of-the-art deep learning algorithms,namely YOLOv8 and Roboflow *** goal is to contribute to the preservation and understanding of historical texts,showcasing the potential of modern deep learning methods in archaeological *** research culminates in several key findings and scientific *** comprehensively compare the performance of YOLOv8 and Roboflow 3.0 in the context of Palmyrene character segmentation—this comparative analysis mainly focuses on the strengths and weaknesses of each algorithm in this *** also created and annotated an extensive dataset of Palmyrene inscriptions,a crucial resource for further research in the *** dataset serves for training and evaluating the segmentation *** employ comparative evaluation metrics to quantitatively assess the segmentation results,ensuring the reliability and reproducibility of our findings and we present custom visualization tools for predicted segmentation *** study advances the state of the art in semi-automatic reading of Palmyrene inscriptions and establishes a benchmark for future *** availability of the Palmyrene dataset and the insights into algorithm performance contribute to the broader understanding of historical text analysis.

关键词： Optical character recognition instance segmentation Palmyrene ancient languages computer vision

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香椿的树木年轮宽度与超年生殖行为的相互关系:对树轮学研究的警示

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Journal of Plant Ecology 2024年第1期17卷 165-171页

作者： Monique Silva Costa Thaís Jorge de Vasconcellos Claudio Sergio Lisi arno Fritz Neves Brandes Mario Tomazello-Filho Cátia Henriques Callado Instituto de Aplicação Fernando Rodrigues da Silveira Universidade do Estado do Rio de JaneiroRua Barão de Itapagipe96.Rio Comprido 20261-005Rio de JaneiroBrazil Laboratório de Anatomia Vegetal Universidade do Estado do Rio de JaneiroRua São Francisco Xavier524Maracanã20550-013Rio de JaneiroBrazil Departamento de Biologia Universidade Federal de SergipeAv.Marechal Rondon s/n-Rosa Elze.São Cristóvão 49100-000SergipeBrazil Departamento de Biologia Geral Universidade Federal FluminenseRua Prof.Marcos Waldemar de Freitas ReisS/N.Gragoatá24210-201Rio de JaneiroBrazil Escola Superior de Agricultura Luiz de Queiroz Universidade de São PauloAv.Pádua Dias11.Piracicaba 13418-900São PauloBrazil

资源分配到生殖过程涉及到生态和进化因素,可能会减少植物的营养生长。这种相互关系在自然界中不容易观察到,因为有许多参数可以限制生殖结构的产生或生物量的增加。我们将香椿(Cedrela odorata L.,楝科)在里约热内卢州大西洋森林中的... 详细信息

资源分配到生殖过程涉及到生态和进化因素,可能会减少植物的营养生长。这种相互关系在自然界中不容易观察到,因为有许多参数可以限制生殖结构的产生或生物量的增加。我们将香椿(Cedrela odorata L.,楝科)在里约热内卢州大西洋森林中的树木年轮宽度与超年生殖行为相关联。总体而言,生殖结构的发育发生在湿润的年份,在生长季初期没有出现水分亏缺。然而,在这些年份,树木年轮宽度较小。这些结果可能与树木年轮宽度与当地气候之间缺乏相关性有关。因此,我们强调在径向生长研究中纳入生殖数据的重要性,以扩大对热带森林生长变异性的理解。

关键词：植物生长策略树木年轮学树木生态学生殖权衡

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Confirmation of a Sub-Saturn-size Transiting Exoplanet Orbiting a G Dwarf:TOI-1194 b and a Very Low Mass Companion Star: TOI-1251 B from TESS

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Research in Astronomy and Astrophysics 2024年第3期24卷 129-143页

作者： Jia-Qi Wang Xiao-Jun Jiang Jie zheng Hanna Kellermann arno Riffeser Liang Wang Karen A.Collins Allyson Bieryla Lars A.Buchhave Steve B.Howell Elise Furlan Eric Girardin Joao Gregorio Eric Jensen Felipe Murgas Mesut Yilmaz Sam Quinn Xing Gao Ruo-Yu zhou Frank Grupp Hui-Juan Wang CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy Of SciencesBeijing 10010China University of Chinese Academy of Sciences Beijing 100049China University Observatory Munich Scheinertrsse 1.D-81679 MunichGemany Max Planck Institute for Extraterrestrial Physics Giessenbachstr.1D-85748 GarchingGermany National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China Center for Astrophysics Harvard&Smithsonian60 Garden Street.CambridgeMA 02138USA National Space Institute Technical University of DenmarkElektrovejDK-2800 KgsLyngbyDenmark NASA Ames Research Center Moffett FieldCA 94035USA NASA Exoplanet Science Institute Caltech/IPACMail Code 100-221200 E.California Blvd.PasadenaCA91125USA Grand Pra Observatory Switzerland Department of Physics Washington UniversitySt.LouisMO 63130.USA Department of Physics and Astronomy Swarthmore CollegeSwarthmorePA 19081USA Instituto de Astrofísica de Canarias(IAC) E-38205 La Laguna.TenerifeSpain Departamento de Astrofísica Universidad de La LagunaSpain Dept.of Astronomy and Space Sciences Ankara UniversityTandogan 06100AnkaraTurkey Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Urumqi No.1 Senior High School Urumqi 830002China Lijiang Gemini Observatory Lijiang 674199China

We report the confirmation of a sub-Saturn-size exoplanet,TOI-1194 b,with a mass of about 0.456+0.055-0.051M_(J),and a very low mass companion star with a mass of about 96.5±1.5 MJ,TOI-1251 *** candidates provided by the Transiting Exoplanet Survey Satellite(TESS)are suitable for further follow-up observations by ground-based telescopes with small and medium *** analysis is performed based on data from several telescopes worldwide,including telescopes in the Sino-German multiband photometric campaign,which aimed at confirming TESS Objects of Interest(TOIs)using ground-based small-aperture and medium-aperture telescopes,especially for long-period ***-1194 b is confirmed based on the consistent periodic transit depths from the multiband photometric *** measure an orbital period of 2.310644±0.000001 days,the radius is 0.767+0.045-0.041RJ and the amplitude of the RV curve is 69.4_(-7.3)^(+7.9)m s^(-1).TOI-1251 B is confirmed based on the multiband photometric and high-resolution spectroscopic data,whose orbital period is 5.963054+0.000002-0.000001days,radius is 0.947+0.035-0.033 R_(J) and amplitude of the RV curve is 9849_(-40)^(+42)ms^(-1).

关键词： planets and satellites fundamental parameters-planets and satellites gaseous planets-stars fundamental parameters-stars low-mass-methods data analysis-techniques photometric-techniques spectroscopic

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A new approach to endoscopic treatment of tumors of the esophagogastric junction with individually designed self-expanding metal stents

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World Journal of Gastroenterology 2008年第24期14卷 3919-3921页

作者： Serhat Aymaz arno J Dormann Department of Medicine Cologne City HospitalHolweideNeufelder Strasse 32

The incidence of adenocarcinoma of the esophago-gastric junction is constantly increasing. Curative treatment is no longer possible at the time of diagnosis in more than 50% of patients with esophageal carcinoma,and palliative treatment focusing on eliminating dysphagia is required. Endoscopic therapy with stent implantation is an established method of achieving this. It can be carried out quickly,with a low rate of early complications,and leads to fast symptomatic improvement,assessed using the dysphagia score. The relatively high rate of late complications such as stent migration,hemorrhage,and gastroesophageal mucosal prolapse has led to recent debate on the role of metal stents in palliative therapy. We present here a new type of stent design for transcardial application,which is intended to prevent bleeding due to mechanical mucosal lesions caused by the distal end of the stent extending into the stomach. The further intention of this case report is to force the discussion on individually designed nitinol stents in special anatomic conditions.

关键词： Esophagus cancer Treatment Palliativetherapy Endoscopic therapy Stent Cardiac cancer

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SolarGAN:Synthetic annual solar irradiance time series on urban building facades via Deep Generative

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能源与人工智能(英文) 2023年第2期12卷 1-21页

作者： Yufei zhang arno Schlueter Christoph Waibel Chair of Architecture and Building Systems(A/S) ETH ZurichStefano-Franscini-Platz 18093 ZurichSwitzerland

Building Integrated Photovoltaics (BIPV) is a promising technology to decarbonize urban energy systems viaharnessing solar energy available on building envelopes. While methods to assess solar irradiation, especiallyon rooftops, are well established, the assessment on building facades usually involves a higher effort due tomore complex urban features and obstructions. The drawback of existing physics-based simulation programsare that they require significant manual modeling effort and computing time for generating time resolveddeterministic results. Yet, solar irradiation is highly intermittent and representing its inherent uncertainty maybe required for designing robust BIPV energy systems. Targeting on these drawbacks, this paper proposes adata-driven model based on Deep Generative Networks (DGN) to efficiently generate stochastic ensembles ofannual hourly solar irradiance time series on building facades with uncompromised spatiotemporal resolutionat the urban scale. The only input required are easily obtainable fisheye images as categorical shading maskscaptured from 3D models. In principle, even actual photographs of urban contexts can be utilized, given they are semantically segmented. The potential of our approach is that it may be applied as a surrogate for timeconsuming simulations, when facing lacking information (e.g., no 3D model exists), and to use the generatedstochastic time-series ensembles in robust energy systems planning. Our validations exemplify a good fidelityof the generated time series when compared to the physics-based simulator. Due to the nature of the usedDGNs, it remains an open challenge to precisely reconstruct the ground truth one-to-one for each hour of theyear. However, we consider the benefits of the approach to outweigh the shortcomings. To demonstrate themodel’s relevance for urban energy planning, we showcase its potential for generative design by parametricallyaltering characteristic features of the urban environment and produc

关键词： Urban solar potential Data-driven Deep Generative Networks(DGN) Building-integrated photovoltaic(BIPV) Generative Adversarial Network(GAN) Variational Autoencoder(VAE)

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THERMOCHROMIC EFFECTS OF LEUCO DYES STUDIED IN POLYPROPYLENE

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Chinese Journal of Polymer Science 2006年第4期24卷 363-368页

作者： arno Seeboth Detlef L(o|¨)tzsch Elvira Potechius Renate Vetter Fraunhofer Institute for Applied Polymer Research

A series of thermochromic polypropylene foils were prepared by embedding various leuco dye-developer-solvent systems in the polymer matrix. Bisphenol A, laurylgallate, ethylgallate and p-hydroxybenzoic acid methyl ester were used as developers, crystal violet lactone and 3,3-bis-（1-n-butyl-2-methyl-3-indolyl）-phthalide as dyes and l-octanoic acid methyl ester as solvent. The molar ratio between the three components of the investigated leuco dye-developer-solvent systems was kept constant. All obtained polypropylene foils exhibit an excellent thermochromic behavior. The foils, prepared by extrusion technology, switch from color to colorless with increasing temperature. The influence of molecular structure of the developer on the intensity of the colored state and the influence of a developer-surfactant complex on the resulting thermochromic properties were investigated. The results are presented and discussed in detail according to a molecular model suggesting that the ring-opening process of the leuco dye is triggered by the formation of dye-developer complexes via H-bondings.

关键词： Thermochromism Dyes Extrusion UV-Vis spectroscopy.

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Genetics of complex diseases

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Journal of zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第2期7卷 167-168页

作者： MOTULSKY arno G. University of Washington Seattle WA 98195 USA

Approaches to the study of the genetic basis of common complex diseases and their clinical applications are con-sidered. Monogenic Mendelian inheritance in such conditions is infrequent but its elucidation may help to detect pathogenic mechanisms in the more common variety of complex diseases. Involvement by multiple genes in complex diseases usually occurs but the isolation and identification of specific genes so far has been exceptional. The role of common polymorphisms as indicators of disease risk in various studies is discussed.

关键词： Complex disease Polymorphisms Multifactorial inheritance Monogenic inheritance

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