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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

A comparative study of semi-active control strategies for base isolated buildings

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Earthquake Engineering and Engineering Vibration 2015年第3期14卷 487-502页

作者： Oliveira F. morais P. Suleman A. National Laboratory for Civil Engineering (LNEC) Av. do Brasil 101 1700-066 Lisbon Portugal Scholarship HolderPh D CandidateMSc National Laboratory for Civil Engineering (LNEC) Av. do Brasil 101 1700-066 Lisbon Portugal Researcher Ph D University of Victoria Dep. Mechanical Engineering PO Box 1700 Stn CSC Victoria BC V8W 2Y2 Canada Professor Ph D PEng

A comparative analytical study of several control strategies for semi-active(SA) devices installed in baseisolated buildings aiming to reduce earthquake induced vibrations is *** force tracking schemes comprising a linear controller plus a 'clipped' algorithm and a nonlinear output feedback controller(NOFC) are considered to tackle this *** controllers include the integral controller(I),the linear quadratic regulator(LQR) and the model predictive controller(MPC).A single degree-of-freedom system subjected to input accelerograms representative of the Portuguese seismic actions are first used to validate and evaluate the feasibility of these *** obtained results show that structural systems using SA devices can in general outperform those equipped with passive devices for lower fundamental frequency structural systems,namely base-isolated *** effectiveness of the proposed strategies is also evaluated on a 10 storey base-isolated dual frame-wall *** force tracking scheme with an integral controller outperforms the other three as well as the original structure and the structure equipped with passive devices.

关键词： semi-active control integral controller linear qua

Ion Dynamics in Concentrated Electrolyte Solutions:Relating Equilibrium Fluctuations of the Ions to Transport Properties in Battery Cells

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Energy & Environmental Materials 2024年第1期7卷 131-138页

作者： Bernhard Roling vanessa Miß Janosch Kettner Department of Chemistry University of MarburgHans-Meerwein-Str.435032 MarburgGermany

In recent years,the interest in the development of highly concentrated electrolyte solutions for battery applications has increased *** electrolyte solutions are typically characterized by a low flammability,a high thermal and electrochemical stability and by the formation of a stable solid electrolyte interphase(SEI)in contact to electrode ***,the classification of concentrated electrolyte solutions in terms of the classical scheme"strong"or"weak"has been controversially discussed in the *** this paper,a comprehensive theoretical framework is presented for a more general classification,which is based on a comparison of charge transport and mass *** combining the Onsager transport formalism with linear response theory,center-of-mass fluctuations and collective translational dipole fluctuations of the ions in equilibrium are related to transport properties in a lithium-ion battery cell,namely mass transport,charge transport and Li^(+)transport under anion-blocking *** relevance of the classification approach is substantiated by showing that i)it is straightforward to classify highly concentrated electrolytes and that ii)both fast charge transport and fast mass transport are indispensable for achieving fast Li^(+)transport under anion-blocking conditions.

关键词： batteries concentrated electrolytes linear response theory Onsager formalism transport

SUSTAINABLE IMPACT OF BUILDING ENERGY RETROFIT MEASURES

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Journal of Green Building 2017年第3期12卷 69-84页

作者： Amirhosein Jafari vanessa Valentin Department of Civil Engineering University of New MexicoAlbuquerqueNM 87131USA

Energy retrofitting is argued to be the most feasible and cost-effective method for improving existing buildings’energy *** a sustainable development,build-ing energy retrofits require the consideration and integration of all three sustainability dimensions:environmental,economic and *** objective of this study is to estimate and compare the sustainable impact of building energy retrofits to determine the maximum sustainable benefit when implementing different energy-related *** proposed analysis consists of integrating three approaches for evaluating these *** benefits are measured by estimating the payback period of energy-related measures,environmental benefits are measured by estimating the CO_(2) equivalent saving per year due to the implementation of energy-related measures,and social benefits are measured by defining a“social impact index”that establishes the impact of energy-related measures on buildings’users.A case study is used to demonstrate the framework for four potential *** results show that for the case study,energy-related“controlling”and“upgrading mechanical system”measures have the highest sustainable impact among the identified energy retrofitting measures.

关键词： sustainable impact energy improvement energy measure building retrofits

Mixed-method study on medicinal herb collection in relation to wildlife conservation:the case of giant pandas in China

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Integrative Zoology 2019年第6期14卷 604-612页

作者： Yichao ZENG Jindong ZHANG vanessa HULL Department of Wildlife Ecology and Conservation University of FloridaGainesvilleFloridaUSA Key Laboratory of Southwest China Wildlife Resources Conservation China West Normal UniversityMinistry of EducationNanchongChina

Medicinal herb collection has historical and cultural roots in many rural communities in developing *** where herb collection occurs may overlap with biodiversity hotspots and crucial habitat of endangered and threatened ***,impacts of such practices on wildlife are unknown and possibly underestimated,perhaps due to the elusive nature of such *** examined this phenomenon in Wolong Nature Reserve,China,a protected area in the South-Central China biodiversity hotspot that also supports a community of Tibetan,Qiang and Han people who use herb collection as a supplementary source of *** adopted a participatory approach in which we engaged local people in outlining spatial and temporal dynamics of medicinal herb collection *** found that the overall spatial extent of herb collection increased in the past two *** then overlaid herb collection maps with localities of giant panda(Ailuropoda melanoleuca)feces collected over two time points in the *** a Bayesian parameter estimation,we found evidence for declined giant panda occurrence in the areas most recently impacted by emerging medicinal herb *** methodology demonstrates the potential power of integrating participatory approaches with quantitative methods for processes like herb collection that may be difficult to examine *** discuss future directions for improving explanatory power and addressing uncertainty in this type of mixed-method,interdisciplinary re*** work has implications for future attempts to understand whether and how prevalent but subtle human activities may affect wildlife conservation.

关键词： Bayesian parameter estimation medicinal herb collection participatory mapping wildlife conservation

What can a heavy U(1)B-L Z'boson do to the muon(g-2)u anomaly and to a new Higgs boson mass?

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Chinese Physics C 2021年第1期45卷 32-46页

作者： Antonio P.morais Roman Pasechnik J.Pedro Rodrigues Departamenlo de Fisica da Universidade de Aveiro and CIDMA Campus de Santiago 3810-183 AveiroPortugal Department of Astronomy and Theoretical Physics Lund UniversitySE 223-62 LundSweden Nuclear Physics Institute ASCR 25068 RezCzech Republic Departamento de Fisica CFMUniversidade Federal de Santa CatarinaC.P.476CEP 88.040-900FlorianopolisSCBrazil

The minimal U(1)B_L extension of the Standard Model(B-L-SM)offers an explanation for neutrino mass generatio n via a seesaw mechanism;it also offers two new physics states,namely an extra Higgs bos on and a new Z'gauge *** emerge nee of a second Higgs particle as well as a new Z'gauge boson,both lin ked to the breaking of a local U(1)B_L symmetry,makes the B-L-SM rather constrained by direct searches in Large Hadron Collider(LHC)*** investigate the phenomenological status of the B-L-SM by confr on ting the new physics predictions with the LHC and electroweak precision *** into account the current bounds from direct LHC searches,we demonstrate that the prediction for the muon(g-2)u anomaly in the B-L-SM yields at most a contribution of approximately 8.9×10^-12,which represents a tension of 3.28 standard deviations,with the current 1σuncertainty,by means of a Z'boson if its mass is in the range of 6.3 to 6.5 TeV,within the reach of future LHC *** means that the B-L-SM,with heavy yet allowed Z‘bos on mass range,in practice,does not resolve the tension between the observed anomaly in the muon(g-2)u and the theoretical prediction in the Standard *** a heavy Z'boson also implies that the minimal value for the new Higgs mass is of the order of 400 GeV.

关键词： beyond Standard Model Higgs physics gauge extensions of the Standard Model Z'boson

Telemetry research on elusive wildlife: A synthesis of studies on giant pandas

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Integrative Zoology 2016年第4期11卷 295-307页

作者： Thomas CONNOR vanessa HULL Jianguo LIU Center for Systems Integration and Sustainability Michigan State UniversityEast LansingUSA

Telemetry studies that track animals through space and time can lead to advances in scientific understanding that are vital in conservation *** example,telemetry studies of the giant panda(Ailuropoda melanoleuca)have shed light on many aspects of panda biology,but small sample sizes in each separate study make it difficult to draw broad *** overcome this problem we conducted the first synthesis of all 5 panda telemetry studies conducted to *** these data we investigated patterns in 6 main topics:home range,space-use interactions,core areas,movement patterns,seasonal migration and natal *** found that panda home range sizes do not vary between 2 main mountain ranges(Qionglai and Qinling),as was previously *** results also suggest that female pandas increase their movement in the mating season:a behavior typically attributed only to *** found and summarized telemetry and genetic evidence for female natal dispersal in the giant *** synthesis highlights the need for additional research relating panda behavior to human disturbance factors,and can aid future studies on giant pandas as well as other species.

关键词： giant panda home range natal dispersal synthesis wildlife telemetry

Structural and optical properties of pillared Eu^(3+)-containing layered double hydroxides intercalated by 2-to 12-carbon aliphatic dicarboxylates

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Journal of Rare Earths 2022年第2期40卷 260-267,I0003页

作者： Alexandre Candido Teixeira Ivan Guide Nunes Silva Alysson Ferreira.morais Danilo Mustafa Physics Institute.University of Sao Paulo 05508-090Sao PauloSPBrazil

While the versatile composition of layered double hydroxides(LDHs)allows the introduction of almost any polyvalent cation in their structure,the exchangeable negatively charged ions intercalated between the plates increase their vast range of *** we report on the preparation and optical properties of pillared Eu^(3+)-substituted ZnAl LDHs intercalated by aliphatic dicarboxylates:-OOC-(CH_(2))_(n-2)-COO-.The basal distance in these materials is dependent on the size and packing of the intercalated *** varying the number(n)of carbon atoms in the aliphatic chain from 2 to 12,the interlayer gallery of these ZnAlEu LDHs is considerably expanded from 0.9 to 2.1 *** the interlayer gallery,the aliphatic dicarboxylates form a monolayer,with the aliphatic chain inclined by an angleα≈63°with the hydroxide *** carbon atom in the COO-group is 0.43 nm far from the metal plane,showing that these carboxylates are not grafted in the brucite-like *** LDHs are thermally stable up to around 150℃,after which dehydroxylation of the hydroxide layers is *** Judd-Ofelt intensity parameters were obtained and compared to the Eu^(3+)-containing complexes with the same ligand series indicating a more symmetrical and less polarizable chemical environment around the rare earth ion.

关键词： Europium Layered double hydroxides Carboxylate ligands Luminescence Rare earths

Extracellular vesicle fingerprinting:the next generation for cancer diagnosis?

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Signal Transduction and Targeted Therapy 2020年第1期5卷 294-296页

作者： vanessa Sandim Robson Q.Monteiro Institute of Medical Biochemistry Leopoldo de Meis Federal University of Rio de JaneiroRio de JaneiroBrazil

In a recent report,Hoshino and colleagues from several institutions around the world demonstrated that large-scale proteomic analysis of extracellular vesicles(EVs)and particles comprising exomeres and two distinct subpopulations of small and large exosomes(which were named as EVPs)might constitute the next generation for cancer diagnosis.

关键词： diagnosis cancer constitute