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A combined technique of Kalman filter, artificial neural network and fuzzy logic for gas turbines and signal fault isolation

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Chinese Journal of Aeronautics 2021年第2期34卷 124-135页

作者： simone TOGNI Theoklis NIKOLAIDIS Suresh SAMPATH Department of Power and Propulsion Cranfield UniversityCranfield MK-43United Kingdom

The target of this paper is the performance-based diagnostics of a gas turbine for the automated early detection of components malfunctions. The paper proposes a new combination of multiple methodologies for the performance-based diagnostics of single and multiple failures on a two-spool engine. The aim of this technique is to combine the strength of each methodology and provide a high success rate for single and multiple failures with the presence of measurement malfunctions. A combination of KF(Kalman Filter), ANN(Artificial Neural Network) and FL(Fuzzy Logic) is used in this research in order to improve the success rate, to increase the flexibility and the number of failures detected and to combine the strength of multiple methods to have a more robust solution. The Kalman filter has in his strength the measurement noise treatment, the artificial neural network the simulation and prediction of reference and deteriorated performance profile and the fuzzy logic the categorization flexibility, which is used to quantify and classify the failures. In the area of GT(Gas Turbine) diagnostics, the multiple failures in combination with measurement issues and the utilization of multiple methods for a 2-spool industrial gas turbine engine has not been investigated *** paper reports the key contribution of each component of the methodology and brief the results in the quantification and classification success rate. The methodology is tested for constant deterioration and increasing noise and for random deterioration. For the random deterioration and nominal noise of 0.4%, in particular, the quantification success rate is above 92.0%, while the classification success rate is above 95.1%. Moreover, the speed of the data processing(1.7 s/sample)proves the suitability of this methodology for online diagnostics.

关键词： Artificial neural network Data analytics Data filtering Diagnostics Fuzzy logic Gas turbine Kalman filter Performance-based diagnostics

Optically pumped low-threshold microdisk lasers on a GeSn-on-insulator substrate with reduced defect density

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Photonics Research 2022年第6期10卷 1332-1337页

作者： YONGDUCK JUNG DANIEL BURT LIN ZHANG YOUNGMIN KIM HYO-JUN JOO MELVINA CHEN simone ASSALI OUSSAMA MOUTANABBIR CHUAN SENG TAN DONGUK NAM School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Engineering Physics École Polytechnique de MontréalMontréalQuébec H3C 3A7Canada

Despite the recent success of GeSn infrared lasers,the high lasing threshold currently limits their integration into practical *** structural defects in epitaxial GeSn layers have been identified as one of the major bottlenecks towards low-threshold GeSn lasers,the effect of defects on the lasing threshold has not been well studied ***,we experimentally demonstrate that the reduced defect density in a GeSn-on-insulator substrate improves the lasing threshold *** first present a method of obtaining high-quality GeSn-oninsulator layers using low-temperature direct bonding and chemical–mechanical ***-temperature photoluminescence measurements reveal that the reduced defect density in GeSn-on-insulator leads to enhanced spontaneous emission and a reduced lasing threshold by0 times andtimes,*** result presents a new path towards pushing the performance of GeSn lasers to the limit.

关键词： GeSn pumped polishing

Recent progress in polar metabolite quantification in plants using liquid chromatography-mass spectrometry

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Journal of Integrative Plant Biology 2014年第9期56卷 816-825页

作者： Zhiqian Liu simone Rochfort Department of Environment and Primary Industries Dairy Futures Co-operative Research Centre La Trobe University

Metabolite analysis or metabolomics is an important component of systems biology in the post-genomic *** separate liquid chromatography（LC） methods for quantification of the major classes of polar metabolites of plants have been available for decades,a single method that enables simultaneous determination of hundreds of polar metabolites is possible only with gas chromatography-mass spectrometry（GC-MS） *** rapid expansion of new LC stationary phases in the market and the ready access of mass spectrometry in many laboratories provides an excellent opportunity for developing LC-MS based methods for multitarget quantification of polar *** various LC-MS methods have been developed over the last 10 years with the aim to quantify one or more classes of polar compounds in different matrices,currently there is no consensus LC-MS method that is widely used in plant metabolomics *** most promising methods applicable to plant metabolite analysis will be reviewed in this paper and the major problems encountered *** aim of this review is to provide plant scientists,with limited to moderate experience in analytical chemistry,with up-to-date and simplified information regarding the current status of polar metabolite analysis using LC-MS techniques.

关键词： Aqueous normal phase chromatography hydrophilic interaction liquid chromatography liquid chromatography-mass spectrometry plants polar metabolites

Egocentric social network correlates of physical activity

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Journal of Sport and Health Science 2020年第4期9卷 339-344页

作者： Sonja Motteli simone Dohle Department of Health Sciences and Technology(D-HEST) ETH Z€urichZ€urich 8092Switzerland Department of Psychology University of CologneCologne 08215Germany

Background:The social environment might play an important role in explaining people’s physical activity(PA)***,little is known regarding whether personal networks differ between physically active and physically inactive *** study aimed to examine the relationship between personal network characteristics and adults’physical(in)***:An egocentric social network study was conducted in a random sample in Switzerland(n=529,mean age of 53 years,54%females).Individual and personal network measures were compared between regular exercisers and *** extent of these factors’association with PA levels was also ***:Non-exercisers(n=183)had 70%non-exercising individuals in their personal networks,indicating homogeneity,whereas regular exercisers(n=346)had 57%regularly exercising individuals in their networks,meaning more heterogeneous personal ***,having more regular exercisers in personal networks was associated with higher PA levels,over and above individual *** with an entirely active personal network reported,on average,1 day of PA more per week than respondents who had a completely inactive personal *** personal network characteristics,such as network size or gender composition,were not associated with ***:Non-exercisers seem to be clustered in inactive networks that provide fewer opportunities and resources,as well as less social support,for *** effectively promote PA,both individuals and personal networks need to be addressed,particularly the networks of inactive people(e.g.,by promoting group activities).

关键词： Egocentric network Exercise Inactivity Personal network Physical activity Questionnaire Similarity/homogeneity

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怎样让写作简单一点点

中学生英语 2022年第3期 4-5页

作者： Sonia simone 景一

Let ' s just put the fact right on the table:Writing worthwhile1content2is hard.让我们把事实摆在桌面上:写出有价值的内容是很难的。Capture3your ideas Very often,good ideas come to us in a flash of inspiration and then disappear *** do yourself a favor and create a place where you'll keep all of your genius4insights5,and be able to find them again when you need *** you get into the habit of catching and recording your ideas,including silly ones,you realize how many ideas your creative brain is sending you every *** when you can easily find them again,your mind will never go blank when you try to think about what to work on next.

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A PARALLEL ALGORITHM FOR THE SOLUTION OF LARGE-SCALE NONCONFORMING FLUID-STRUCTURE INTERACTION PROBLEMS IN HEMODYNAMICS

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Journal of Computational Mathematics 2017年第3期35卷 363-380页

作者： Davide Forti Alfio Ouarteroni simone DeDaris MATH-CMCS Ecole Polytechnique Federale de Lausanne Station 8 CH-1015 Lausanne Switzerland

In this work we address the numerical solution of large scale fluid-structure interaction problems when nonconforming grids and/or nonconforming finite elements discretizations are used at the interface separating the fluid and structure physical domains. To deal with nonconforming fluid-structure discretizations we use the INTERNODES method （INTER- polation for NOnconforming DEcompositionS） formerly introduced in [6] for the solution of elliptic PDEs on nonconforming domain decomposition. To cope with the high com- putational complexity of the three dimensional FSI problem obtained after spatial and temporal discretization, we use the block parallel preconditioner FaCSI [7]. A numerical investigation of the accuracy properties of INTERNODES applied to the nonconforming FSI problem is carried out for the simulation of the pressure wave propagation in a straight elastic cylinder. Finally, we study the scalability performance of the FaCSI precondition- er in the nonconforming case by solving a large-scale nonconforming FSI problem in a patient-specific arterial bypass.

关键词： Fluid-Structure Interaction Domain decomposition Nonconforming discretizations INTERNODES Biomechanics Parallel preconditioners High performance comput-ing.

Kinetic Density Functional Theory: A Microscopic Approach to Fluid Mechanics

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Communications in Theoretical Physics 2014年第10期61卷 596-606页

作者： Umberto Marini Bettolo Marconi simone Melchionna Scuola di Scienze e Tecnologie Università di CamerinoVia Madonna delle Carceri62032CamerinoINFN PerugiaItaly Istituto Processi Chimico-Fisici Consiglio Nazionale delle RicercheItaly

In the present paper we give a brief summary of some recent theoretical advances in the treatment of inhomogeneous fluids and methods which have applications in the study of dynamical properties of liquids in situations of extreme confinement, such as nanopores, nanodevices, etc. The approach obtained by combining kinetic and density functional methods is microscopic, fully self-consistent and allows to determine both configurational and flow properties of dense fluids. The theory predicts the correct hydrodynamic behavior and provides a practical and numerical tool to determine how the transport properties are modified when the length scales of the confining channels are comparable with the size of the molecules. The applications range from the dynamics of simple fluids under confinement, to that of neutral binary mixtures and electrolytes where the theory in the limit of slow gradients reproduces the known phenomenological equations such as the Planck–Nernst–Poisson and the Smolochowski equations. The approach here illustrated allows for fast numerical solution of the evolution equations for the one-particle phase-space distributions by means of the weighted density lattice Boltzmann method and is particularly useful when one considers flows in complex geometries.

关键词： Kinetic theory dynamical density functional theory electrokinetics

Debris Flows Risk Analysis and Direct Loss Estimation:the Case Study of Valtellina di Tirano,Italy

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Journal of Mountain Science 2014年第2期11卷 288-307页

作者： Jan BLAHUT Thomas GLADE simone STERLACCHINI Department of Engineering Geology Institute of Rock Structure and Mechanics Academy of Sciences of the Czech Republic Geomorphic Systems and Risk Research Group Department of Geography and Regional Research University of Vienna Institute for the Dynamic of Environmental Processes National Research CouncilCNR-IDPA

Landslide risk analysis is one of the primary studies providing essential instructions to the subsequent risk management process. The quantification of tangible and intangible potential losses is a critical step because it provides essential data upon which judgments can be made and policy can be formulated. This study aims at quantifying direct economic losses from debris flows at a medium scale in the study area in Italian Central Alps. Available hazard maps were the main inputs of this study. These maps were overlaid with information concerning elements at risk and their economic value. Then, a combination of both market and construction values was used to obtain estimates of future economic losses. As a result, two direct economic risk maps were prepared together with risk curves, useful to summarize expected monetary damage against the respective hazard probability. Afterwards, a qualitative risk map derived using a risk matrix officially provided by the set of laws issued by the regional government, was prepared. The results delimit areas of high economic as well as strategic importance which might be affected by debris flows in the future. Aside from limitations and inaccuracies inherently included in risk analysis process, identification of high risk areas allows local authorities to focus their attention on the "hot-spots", where important consequences may arise and local(large) scale analysis needs to be performed with more precise cost-effectiveness ratio. The risk maps can be also used by the local authorities to increase population's adaptive capacity in the disaster prevention process.

关键词：风险分析损失评估泥石流意大利直接经济损失案例阿尔卑斯山管理过程

Influence of Surface Finishing on High-Temperature Oxidation of AISI Type 444 Ferritic Stainless Steel Used in SOFC Stacks

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Acta Metallurgica Sinica(English Letters) 2017年第8期30卷 697-711页

作者： Valeria Bongiorno Paolo Piccardo simone Anelli Roberto Spotorno Laboratorio di Metallurgia e Materiali - Dipartimento di Chimica e Chimica Industriale (LMM-DCCI) Universita degli Studi di Genova Via Dodecaneso 31 16146 GenoaItaly

This research is focused on the study of the samples, approximatively 15 × 30 mm^2 sized, that were mechanically cut from two sheets （0.4 and 0.2 mm thick, respectively） of AIS1444 Type ferritic stainless steel （FSS）（DIN 1.4521, Eu designation X2CrMoTil8-2）; this material was in the ＇as-rolled＇ state. Part of these specimens were treated superficially on one side using abrasive SiC papers with different average grit sizes （i.e., 46.2, 30.2, 18.3 gm） and diamond suspension （up to 1 tim） in order to obtain various surface roughness. Both the ＇as-rolled＇ and superficially treated samples were then aged in a muffle fumace in static air according to a thermal cycle corresponding to the curing phase of an experimental glass used as sealing in the solid oxide fuel cell stacks. After aging, the chemical compositions and mor- phological peculiarities of the scale formed depending on the thickness of the samples and their surface state were studied by scanning electron microscopy, energy-dispersive spectroscopy, micro-Raman spectroscopy, bright field light optical microscopy. The obtained results show that all scales formed consist of an inner Cr2O3 subscale and an outer （Mn,Cr）3O4 spinel layer; the relationship between FSS grain size and scale microstructural features is consistent on the samples with mirror-like surface only; the scale thicknesses on SiC grinded samples are comparable; the scales covering the ＇as-rolled＇ surfaces are morphologically similar to those grown on the surfaces finished with the 30.2 and 18.3 μm SiC papers, and their thicknesses show an intermediate situation between the abraded and the mirror-like specimens. The last described characteristics depend mainly on the surface and microstructural peculiarities resulting from the rolling process.

关键词： AISI Type 444 SOFC stacks Surface roughness Microstructure Surface finishing High-temperature oxidation