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Energy and Built Environment 2024年第6期5卷 889-899页

作者： G.R.Araújo Ricardo Gomes Paulo Ferrão M.Glória Gomes IN+ DEMTécnico LisboaUniversidade de lisboaAv Rovisco PaisLisboa1049-001Portugal CERIS DECivilTécnico LisboaUniversidade de LisboaAv Rovisco PaisLisboa1049-001Portugal

The building stock is responsible for a large share of global energy consumption and greenhouse gas emissions,therefore,it is critical to promote building retrofit to achieve the proposed carbon and energy neutrality *** of the policies implemented in recent years was the Energy Performance Certificate(EPC)policy,which proposes building stock benchmarking to identify buildings that require ***,research shows that these mechanisms fail to engage stakeholders in the retrofit process because it is widely seen as a mandatory and complex *** study makes use of an EPC database to integrate machine learning techniques with multi-objective optimization and develop an interface capable of(1)predicting a building’s,or household’s,energy needs;and(2)providing the user with optimum retrofit solutions,costs,and return on *** goal is to provide an open-source,easy-to-use interface that guides the user in the building retrofit *** energy and EPC prediction models show a coefficient of determination(R2)of 0.84 and 0.79,and the optimization results for one case study EPC with a 2000€budget limit inÉvora,Portugal,show decreases of up to 60%in energy needs and return on investments of up to 7 in 3 years.

关键词： Building energy performance Building optimization Multi-Objective surrogate models Building retrofitting

Prediction of ground-borne vibration induced by impact pile driving:numerical approach and experimental validation

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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 921-935页

作者： A.Colaço P.Alves Costa C.Ferreira C.Parente J.Fernandez-Ruiz CONSTRUCT-FEUP University of PortoRua Dr.Roberto Frias4200-465 PortoPortugal University of La Coruña Department of Civil EngineeringCampus de Elviña 15071La CoruñaSpain

Deep foundations are currently used in engineering practice to solve problems caused by weak geotechnical characteristics of the *** pile driving is an interesting and viable solution from economic and technical points of ***,it is necessary to ensure that the environmental drawbacks,namely ground-borne vibration,are adequately *** this purpose,the authors propose an axisymmetric finite element method-perfectly matched layer(FEM-PML)approach,where the nonlinear behavior of the soil is addressed through an equivalent linear *** the complexity of the problem,an experimental test site was developed and fully *** experimental work comprised in-situ and laboratory soil characterization,as well as the measurement of vibrations induced during pile *** comparison between experimental and numerical results demonstrated a very good agreement,from which it can be concluded that the proposed numerical approach is suitable for the prediction of vibrations induced by impact pile *** experimental database is available as supplemental data and may be used by other researchers in the validation of their prediction models.

关键词： pile driving ground-borne vibrations numerical modeling experimental validation

Multi-objective optimal configuration of current limiting strategies

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Science China(Technological Sciences) 2014年第9期57卷 1738-1749页

作者： YE ChengJin HUANG MinXiang College of Electrical Engineering Zhejiang University

With the level of short-circuit current of power systems growing increasingly higher,optimal allocation of current limiters has received considerable attention in recent years,especially in *** paper analyzes two kinds of common used current limiters based on the increment of bus impedance matrix and proposes a multi-objective current limiters configuration model considering the investment of limiters,the level of short-circuit current,as well as the transient stability of power *** innovative search space reduction technique based on sensitivity factor is introduced to choose better candidate locations for current limiters so as to avoid the curse of *** elitist non-dominated sorting genetic algorithm II is used to search the Pareto-optimal solutions of the proposed *** order to further improve optimization efficiency,master-slave parallel modification of NSGA-II program structure is *** satisfactory case study results demonstrate the feasibility of the proposed multi-objective method in power system current limiters allocation associated with cost,security and stability.

关键词： power system short-circuit current limiter transient stability multi-objective optimization NSGA-II sensitivity factor parallel computing

A Comprehensive Survey on Fault Diagnosis and Fault Tolerance of DC-DC Converters

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Chinese Journal of Electrical Engineering 2018年第3期4卷 1-12页

作者： Fernando Bento Antonio J.Marques Cardoso CISE-Electromechatronic Systems Research Centre Universidade da Beira InteriorCalcada Fonte do LameiroP-6201-001 CovilhaPortugal Department of Electromechanical Engineering Universidade da Beira InteriorCalcada Fonte do LameiroP-6201-001 CovilhaPortugal

DC-DC converters are becoming more commonly used in power conversion solutions for energy management purposes,being employed in an ever-increasing range of DC-based applications,such as LED lighting,electric vehicles,energy storage solutions,and consumer electronics(laptops,smartphones,etc.).In this context,efficiency and reliability are *** research efforts made in improving reliability of DC-DC converters are still quite narrow and ***,DC-DC converters take the shape of an endless number of topologies,with different functionalities and operation principles,thus complicating the task of improving reliability of all forms of DC-DC ***,compiling the information about the main failure modes,corresponding fault diagnostic algorithms and fault tolerance strategies developed so far,in a single document,becomes increasingly ***,this paper presents an up-to-date review of the recent achievements attained regarding the improvement of availability and reliability of DC-DC converters.

关键词： DC-DC converters fault diagnosis fault tolerance reliability

A Posteriori Stabilized Sixth-Order Finite Volume Scheme with Adaptive Stencil Construction:Basics for the 1D Steady-State Hyperbolic Equations

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Communications on Applied Mathematics and Computation 2023年第2期5卷 751-775页

作者： Gaspar J.Machado Stéphane Clain Raphaël Loubère Centre of Physics and Department of Mathematics University of MinhoCampus of Azurém4800-058 GuimaraesPortugal CNRS and Institut de Mathématiques de Bordeaux(IMB) Universitéde BordeauxTalenceFrance

We propose an adaptive stencil construction for high-order accurate finite volume schemes a posteriori stabilized devoted to solve one-dimensional steady-state hyperbolic *** accuracy(up to the sixth-order presently)is achieved,thanks to polynomial recon-structions while stability is provided with an a posteriori MOOD method which controls the cell polynomial degree for eliminating non-physical oscillations in the vicinity of *** supplemented this scheme with a stencil construction allowing to reduce even further the numerical *** stencil is shifted away from troubles(shocks,discontinuities,etc.)leading to less oscillating polynomial *** on linear,Burgers',and Euler equations,we demonstrate that the adaptive stencil technique manages to retrieve smooth solutions with optimal order of accuracy but also irregular ones without spurious ***,we numerically show that the approach allows to reduce the dissipation still maintaining the essentially non-oscillatory behavior.

关键词： Finite volume MOOD Adaptive stencil Steady-state solution Euler equations High order

Traction power substation balance and losses estimation in AC railways using a power transfer device through Monte Carlo analysis

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Railway Engineering Science 2022年第1期30卷 71-95页

作者： Vitor A.Morais Antonio P.Martins Department of Electrical and Computer Engineering Faculty of EngineeringUniversity of PortoPorto 4200465Portugal

The high dynamic power requirements present in modern railway transportation systems raise research challenges for an optimal operation of railway electrification. This paper presents a Monte Carlo analysis on the application of a power transfer device installed in the neutral zone and exchanging active power between two sections. The main analyzed parameters are the active power balance in the two neighbor traction power substations and the system power losses. A simulation framework is presented to comprise the desired analysis and a universe of randomly distributed scenarios are tested to evaluate the effectiveness of the power transfer device system. The results show that the density of trains and the relative branch length of a traction power substation should be considered in the evaluation phase of the best place to install a power transfer device, towards the reduction of the operational power losses, while maintaining the two substations balanced in terms of active power.

关键词： Electric traction systems Monte Carlo analysis Power transfer device Power quality Railway power systems Smart railways

Nano-multilayered ZrN‒Ag/Mo‒S‒N film design for stable anti-frictional performance at a wide range of temperatures

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Friction 2024年第12期12卷 2826-2837页

作者： Hongbo JU Jing LUAN Junhua XU Albano CAVALEIRO Manuel EVARISTO Filipe FERNANDES School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Mechanical Engineering CEMMPREARISEUniversity of CoimbraRua Luís Reis SantosCoimbra 3030-788Portugal TINT-Laboratory for Tribology and Interface Nanotechnology Faculty of Mechanical EngineeringUniversity of LjubljanaAškerčeva 6Ljubljana 1000Slovenia CIDEM ISEP-Polytechnic of PortoRua Dr.António Bernardino de AlmeidaPorto 4249-015Portugal

A multilayer film,composed by ZrN‒Ag(20 nm)and Mo‒S‒N(10 nm)layers,combining the intrinsic lubricant characteristics of each layer was deposited using DC magnetron sputtering system,to promote lubrication in a wide-range of *** results showed that the ZrN‒Ag/Mo‒S‒N multilayer film exhibited a sharp interface between the different layers.A face-centered cubic(fcc)dual-phases of ZrN and Ag co-existed in the ZrN‒Ag layers,whilst the Mo‒S‒N layers displayed a mixture of hexagonal close-packed MoS_(2)(hcp-MoS_(2))nano-particles and an amorphous *** multilayer film exhibited excellent room temperature(RT)triblogical behavior,as compared to the individual monolayer film,due to the combination of a relative high hardness with the low friction properties of both *** reorientation of MoS_(2)parallel to the sliding direction also contributed to the enhanced anti-frictional performance at *** 400℃,the reorientation of MoS_(2)as well as the formation of MoO_(3)phase were responsible for the lubrication,whilst the hard t-ZrO_(2)phase promoted abrasion and,consequently,led to increasing wear *** 600℃,the Ag_(2)MoO_(4)double-metal oxide was the responsible for the low friction and wear-resistance;furthermore,the observed transformation from t-ZrO_(2)to m-ZrO_(2),could also have contributed to the better tribological performance.

关键词： DC magnetron sputtering ZrN‒Ag/Mo‒S‒N multilayer film tribological properties tribo-phases

Interdependence between transportation system and power distribution system: a comprehensive review on models and applications

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Journal of Modern Power Systems and Clean Energy 2019年第3期7卷 433-448页

作者： Wei WEI Danman WU Qiuwei WU Miadreza SHAFIE-KHAH Joao PSCATALAO State Key Laboratory of Power System Department ofElectrical EngineeringTsinghua UniversityBeijingChina Department of Electrical Engineering Technical Universityof DenmarkCopenhagenDenmark School of Technology and Innovations University of VaasaVaasaFinland Institute for Systems and Computer Engineering Technologyand Science(INESC TEC)PortoPortugal Faculty of Engineering University of PortoPortoPortugal

The rapidly increasing penetration of electric vehicles(EVs) in modern metropolises has been witnessed during the past decade, inspired by financial subsidies as well as public awareness of climate change and environment pro-tection. Integrating charging facilities, especially highpower chargers in fast charging stations, into power distribution systems remarkably alters the traditional load flow pattern, and thus imposes great challenges on the operation of distribution network in which controllable resources are rare. On the other hand, provided with appropriate incentives, the energy storage capability of electric vehicle offers a unique opportunity to facilitate the integration of distributed wind and solar power generation into power distribution system. The above trends call for thorough investigation and research on the interdependence between transportation system and power distribution system. This paper conducts a comprehensive survey on this line of research. The basic models of transportation system and power distribution system are introduced,especially the user equilibrium model, which describes the vehicular flow on each road segment and is not familiar to the readers in power system community. The modelling of interdependence across the two systems is *** into account such interdependence, applications ranging from long-term planning to short-term operation are reviewed with emphasis on comparing the description of traffic-power interdependence. Finally, an outlook of prospective directions and key technologies in future research is summarized.

关键词： Charging station Electric vehicle(EV) Interdependence Power flow Power distribution system Transportation system User equilibrium

Cannabinoid Modulation of Monoamine Levels in Mouse Brain:Unveiling Neurochemical Dynamics through an Innovative High‑performance Liquid Chromatography‑Fluorescence Detection Bioanalysis

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Journal of Analysis and Testing 2024年第3期8卷 300-314页

作者： Fonseca Carla Cunha Susana Ferreira Ricardo Lapo Pais Mariana Goncalves Joana Camins Antoni Ettcheto Miren Barbosa Rui Fortuna Ana Laboratory of Pharmacology Faculty of PharmacyUniversity of CoimbraPolo das Ciencias da SaudeAzinhaga de Santa CombaCoimbra 3000‑548Portugal CIBIT/ICNAS-Coimbra Institute for Biomedical Imaging and Translational Research University of CoimbraCoimbra 3000‑548Portugal Department of Pharmacology Toxicology and Therapeutic ChemistryFaculty of Pharmacy and Food ScienceUniversitat de BarcelonaBarcelona 08028Spain Institute of Neurosciences Universitat de BarcelonaBarcelona 08035Spain Faculty of Sciences and Technology Doctoral Program in Biomedical EngineeringUniversity of CoimbraCoimbra 3004‑516Portugal Biomedical Research Networking Centre in Neurodegenerative Diseases(CIBERNED) Carlos Ⅲ Health InstituteMadrid 28031Spain Institut d’Investigacio Sanitaria Pere Virgili(IISPV) Reus 43204Spain CNC-Center for Neuroscience and Cell Biology University of CoimbraCoimbra 3004-504Portugal

Homeostasis of monoaminergic pathways is compromised in aging and neurodegenerative/neurological diseases such as Alzheimer’s disease and *** the other hand,their modulation has also been linked to the mechanism of action of several ***,monitoring the levels of noradrenaline(NA),adrenaline(AD),dopamine(DA),and serotonin(5-HT),as well as those of tryptophan(TRYP),the precursor of 5-HT,and DA metabolites,namely 3,4-dihydroxyphenylacetic acid(DOPAC)and homovanillic acid(HVA),is fundamental for assessing disease severity and *** work aimed to develop and validate the first High-Performance Liquid Chromatography(HPLC)coupled with fluorescence detector(FLD)method that simultaneously and accurately quantifies NA,AD,DA,DOPAC,HVA,5-HT and TRYP in mouse brain and prefrontal cortex(PFC)*** sample preparation by protein precipitation was required to extract the *** curves were plotted using the background subtraction approach to reduce the interference of the endogenous *** and inter-day accuracy and precision were within the ranges defined by ICH(The International Council for Harmonisation)guideline for bioanalytical method *** validation,the impact of cannabidiol(CBD),cannabigerol(CBG),and cannabidivarin(CBDV)was explored in mice brains post-administration,revealing significant alterations in specific neurotransmitter levels upon cannabinoid exposure and shedding light on the complex modulation of neurochemical dynamics by *** research highlights the fit-for-purpose of the HPLC-FLD method and provides insights into potential mechanisms underlying phytocannabinoid actions in the central nervous system(CNS).

关键词： Neurotransmitter HPLC Mice Brain Prefrontal cortex Cannabinoid

Insights into the oxidation resistance mechanism and tribological behaviors of multilayered TiSiN/CrVxN hard coatings

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International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2459-2468页

作者： Hongbo Ju Moussa Athmani Jing Luan Abbas AL-Rjoub Albano Cavaleiro Talha Bin Yaqub Abdelouahad Chala Fabio Ferreira Filipe Fernandes School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Laboratory of Physics of Thin Films and Applications University of Mohamed KhiderBP 145 RPBiskra 07000Algeria CEMMPRE ARISEDepartment of Mechanical EngineeringUniversity of CoimbraCoimbra 3030-788Portugal IPN-LED&MAT-Instituto Pedro Nunes Laboratory of TestsWear and MaterialsCoimbra 3030-199Portugal ISEP Polytechnic of PortoRua Dr.António Bernardino de AlmeidaPorto 4249-015Portugal

In the last decades,vanadium alloyed coatings have been introduced as potential candidates for self-lubrication due to their perfect tribological *** this work,the influence of V incorporation on the wear performance and oxidation resistance of TiSiN/CrN film coatings deposited by direct current(DC)reactive magnetron sputtering is *** results show that vanadium incorporation significantly decreases the oxidation resistance of the *** general,two layers are formed during the oxidation process:i)Ti(V)O_(2) on top,followed by a protective layer,which is subdivided into two layers,Cr_(2)O_(3) and ***)The diffusion of V controls the oxidation of V-containing *** addition of vanadium improves the wear resistance of coatings,and the wear rate decreases with increasing V content in the coatings;however,the friction coefficient is independent of the chemical composition of the *** wear of the V-containing coatings is driven by polishing wear.

关键词： DC magnetron sputtering TiSiN/CrVxN multilayer coatings oxidation resistance tribology wear rate