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Lithium bis(trifluoromethanesulfonyl)imide blended in polyurethane acrylate photocurable solid polymer electrolytes for lithium-ion batteries

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Journal of Energy chemistry 2021年第11期30卷 485-496,I0011页

作者： cristian mendes-Felipe J.c.Barbosa R.Gonsalves D.miranda c.m.costa J.L.Vilas-Vilela S.Lanceros-mendez Bcmaterials Basque Center for MaterialsApplications and NanostructuresUPV/EHU Science Park48940 LeioaSpain macromolecular chemistry Group(LABQUImAc) Department of Physical ChemistryFaculty of Science and TechnologyUniversity of the Basque Country(UPV/EHU)Barrio Sarriena s/nE-48940 LeioaSpain center of Physics University of MinhoCampus of Gualtar4710-057 BragaPortugal center of chemistry University of MinhoCampus of Gualtar4710-057 BragaPortugal Ai–School of Technology IPCABarcelosPortugal Ikerbasque Basque Foundation for Science48009 BilbaoSpain

The increased demand of electronic devices promotes the development of advanced and more efficient energy storage devices, such as batteries. Lithium-ion batteries (LIBs) are the most studied battery systems due to their high performance. Among the different battery components, the separator allows the control of lithium ion diffusion between the electrodes. To overcome some drawbacks of liquid electrolytes, including safety and environmental issues, solid polymer electrolytes (SPEs) are being developed. In this work, a UV photocurable polyurethane acrylate (PUA) resin has been blended with lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) up to 30 wt% LiTFSI content to reach a maximum ionic conductivity of 0.0032 mS/cm at room temperature and 0.09 mS/cm at 100 ℃. Those values allowed applying the developed materials as photocurable SPE in Swagelok type Li/c-LiFePO_(4) half-cells, reaching a battery discharge capacity value of 139 mAh.g^(−1) at c/30 rate. Those results, together with the theoretical studies of the discharge capacity at different c-rates and temperatures for batteries with LiTFSI/PUA SPE demonstrate the suitability of the developed photocurable SPE for LIB applications.

关键词： Solid polymer electrolytes Photocuring Polyurethane acrylate LiTFSI Li-ion batteries

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Distinct physiological mechanisms underpin growth and rehydration of Hymenaea courbaril and Hymenaea stigonocarpa upon short-term exposure to drought stress

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Journal of Forestry Research 2023年第1期34卷 113-123页

作者： Luana m.Luz Ediane c.Alves Nariane Q.Vilhena Tamires B.Oliveira Zara G.B.Silva Joze m.N.Freitas candido F.O.Neto Roberto c.L.costa Lucas c.costa Universidade Federal Rural da AmazOia CapanemaPA 68700-665Brazil Universidade Federal Rural da AmazEia BelémPA 66077-830Brazil

Plants hold biochemical and physiological mechanisms to withstand drought conditions.Generally,depending on water deficit interval,plant rehydration relies on how it can retain growth or a positive water balance—or rarely both.In this study,two species of Hymenaea,one from the Amazon and the other from the Brazilian cerrado,were investigated for their physiological mechanism associated with growth rehydration upon short-term exposure to drought stress.Our findings demonstrate that Hymenaea courbaril tends to invest in nitrogen to the detriment of carbon compounds,-as it is limited by lower net photosynthesis-and adjust root growth to attenuate drought stress responses.In contrast,Hymenaea stigonocarpa takes advantage of higher water potential and a basal rate of lower net photosynthesis to support aboveground growth under such conditions.Hence,it is postulated that there are distinct ways of controlling water status and growth between H.courbaril and H.stigonocarpa,which are determined either by the ability of the species to keep net photosynthesis at low levels of water content or by favoring the accumulation of nitrogen compounds.Both mechanisms were effective with regards to water use efficiency and thus it is reasonable to suggest that strategies are not exclusive and may work under adverse conditions,as observed in Amazon and Brazilian cerrado biomes.Query.

关键词： Hymenaea courbaril Hymenaea stigonocarpa Growth Photosynthesis Water deficit

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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 ground.Impact pile driving is an interesting and viable solution from economic and technical points of view.However,it is necessary to ensure that the environmental drawbacks,namely ground-borne vibration,are adequately met.For 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 methodology.Given the complexity of the problem,an experimental test site was developed and fully characterized.The experimental work comprised in-situ and laboratory soil characterization,as well as the measurement of vibrations induced during pile driving.The 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 driving.The 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

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Structural optimization of patient-specific temporomandibular joint replacement implants for additive manufacturing:novel metrics for safety evaluation and biomechanical performance

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Bio-Design and manufacturing 2022年第2期5卷 333-347页

作者： manuel Pinheiro Anouar Krairi Robin Willaert maria c.costa Wim Van Paepegem mechanics of materials and Structures(mmS) Ghent UniversityGhentBelgium materials Innovation Institute(m2i) DelftThe Netherlands Department of Oral and maxillofacial Surgery University Hospitals Leuven LeuvenBelgium 4 Department of Head and Neck SurgeryGhent University HospitalGhentBelgium

Total temporomandibular joint(TmJ)replacement is recommended only when there is irreversible damage to the joint and no conservative treatment can provide functional improvements.Several stock and custom-made TmJ implants have been made available;however,retrospective and comparative studies were unable to find significant differences between the two types of solutions.The introduction of additive manufacturing(Am)techniques in medical practice allows for a greater freedom of design and a higher degree of device customisation.The combination of Am with structural optimisation may streamline development and provide the key for fabricating biomechanic ally enhanced TmJ implants.In this study,structural optimis ation techniques were applied to develop and numerically validate a patient-specific TmJ implant.The biomechanical behaviour of each intermediate TmJ design was assessed under four different nominal and maximum biting tasks using finite element analyses.In addition,a new set of metrics were proposed to compare each design regarding biomechanical performance and implant safety.The results suggest that 55-82%of the natural/intact strain patterns can be recovered with the finally selected TmJ implant.This represents an increase of 15%in biomechanical performance for incisor biting,15%for right molar biting,17%for left molar biting and a decrease of 2%for left group biting compared with the initial design.The results also suggest that load transfer at the proximal ramus reduces the implant’s impact on the mandible’s strain patterns.Finally,structural optimisation allows for a volume reduction of up to 44%with a minimum loss of implant safety and biomechanical performance.

关键词： Temporomandibular joint Additive manufacturing Implant safety Biomechanical performance Finite element analysis

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Lc–mS characterization, anti-kinetoplastide and cytotoxic activities of natural products from Eugenia jambolana Lam. and Eugenia uniflora

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Asian Pacific Journal of Tropical Biomedicine 2017年第9期7卷 836-841页

作者： celestina Elba sobral de Souza Ana Raquel Pereira da Silva Janaina Esmeraldo Rocha maria celeste Vega Gomez míriam Rolóm cathia coronel José Galberto martins da costa manoel L.c.Netto Larissa A.Rolim Henrique Douglas melo coutinho Laboratório de microbiologia e Biologia molecular Universidade Regional do Cariri center for the Development of Scientific Research Moisés Bertoni Foundation/Díaz Gill Laboratories Laboratório de Pesquisa de Produtos Naturais Universidade Regional do Cariri centro Universitário Dr.Leao Sampaio–UNILEAO Universidade Federal do Vale do Sao Francisco–UNIVASF

Objective: To evaluate the trypanocidal, leishmanicidal and cytotoxic activity of Eugenia jambolana(E. jambolana) and Eugenia uniflora(E. uniflora) extracts and fractions.methods: The products were characterized by Lc–mS. Antiparasitic assays were performed and cytotoxicity was evaluated in fibroblastos. In vitro assays were performed using spectrophotometric evaluation. All assays were performed in thrice.Results: The results showed that the extracts and the tannic fraction from E. jambolana inhibited 100% of the epimastigote lines. The ethanolic extract was the most efficient in all concentrations tested against the three parasite strains. In the cytotoxicity assay the flavonoid fraction showed low toxicity. All E. uniflora samples showed cytotoxicity at the highest concentration tested, but the extract showed no toxic effect on the fibroblasts at the lowest concentration. The flavonoid and tannic fractions were more efficient against Leishmania braziliensis promastigotes compared to the extract. However, the extracts and the tannic fraction were more effective against Leishmania infantum strains. The effect on epimastigote cells was observed at all concentrations tested, with all E. uniflora samples. However, the samples were more effective at the highest concentration, where there was inhibition in 100% of the Trypanosoma cruzi strains.conclusions: The species E. jambolana and E. uniflora presented antiparasitic activity against all tested parasite strains, indicating that these species can serve as an alternative therapy as they were efficient in the tests performed. The E. uniflora extract and the E. jambolana flavonoid fraction presented a low cytotoxicity, opening the floor for new biological studies.

关键词： Antiparasitic effect cytotoxicity Eugenia jambolana Eugenia uniflora

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基于条件的近岸风能维修策略综述（英文）

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Journal of marine Science and Application 2019年第1期18卷 1-16页

作者： Jichuan Kang Jose sobral c.Guedes Soares centre for marine Technology and Ocean Engineering (cENTEc) Instituto Superior Técnico Universidade de Lisboa mechanical Engineering Department Instituto Superior de Engenharia de Lisboa (ISEL)

The existing maintenance strategies of offshore wind energy are reviewed including the specific aspects of condition-based maintenance, focusing on three primary phases, namely, condition monitoring, fault diagnosis and prognosis, and maintenance optimization. Relevant academic research and industrial applications are identified and summarized. The state of art, capabilities,and constraints of condition-based maintenance are analyzed. The presented research demonstrates that the intelligent-based approach has become a promising solution for condition recognition, and an integrated data platform for offshore wind farms is significant to optimize the maintenance activities.

关键词： condition-based maintenance Offshore wind energy Fault diagnosis Fault prognosis maintenance optimization

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Improved dark ambient degradation of organic pollutants by cerium strontium cobalt perovskite

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Journal of Environmental Sciences 2020年第4期32卷 110-118页

作者： Huihuang chen Julius motuzas Wayde martens Joao c.Diniz da costa The University of Queensland FIM^2 Lab-Functional Interfacial Materials and Membranes LaboratorySchool of Chemical EngineeringBrisbaneQld 4072Australia Hefei National Laboratory for Physical Sciences at the microscale University of Science and Technology of ChinaAnhui 230026China Science and Engineering Faculty Queensland University of TechnologyBrisbaneQld 4000Australia LAQV-REQUImTE (Bio)Chemical Process EngineeringDepartment of ChemistryFaculty of Science and TechnologyUniversidade NOVA de LisboaCaparica 2829-516Portugal

This work investigates the effect of cerium substation into strontium cobalt perovskites(ceSrcoO)for the oxidative degradation of OrangeⅡ(OII)in dark ambient conditions without the aid of any external stimulants such as light,heating or chemical additives.The OII degradation rate by ceSrcoO reached 65%in the first hour,whilst for the blank sample without cerium(SrcoO)took over 2 hr to reach the same level of OII degradation.Hence,the cerium substitution improved the catalytic activity of the perovskite material,mainly associated with the ce0.1Sr0.9coO3 perovskite phase.Upon contacting ceSrcoO,the-N=Nazo bonds of the OII molecules broke down resulting in electron donation and the formation of by-products.The electrons are injected into the ceSrcoO and resulted in a redox pair of co3+/co2+,establishing a bridge for the electron transfer between OII and the catalysts.concomitantly,the electrons also formed reactive species(·OH)responsible for OII degradation as evidenced by radical trapping experiment.Reactive species were formed via the reaction between 02 and donated electrons from OII with the aid of cobalt redox pair.As the prepared materials dispensed with the need for light irradiation and additional oxidants,it opens a window of environmental applications for treating contaminated wastewaters.

关键词： Dark catalysis Acid orange degradation cerium substituted perovskite catalytic activity

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Thermal behaviour analysis in a porcelainhoused ZnO surge arrester by computer simulations and thermography

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High Voltage 2019年第3期4卷 173-177页

作者： Arthur F.Andrade Edson G.costa Josué m.B.Fernandes Helem m.m.Alves cícero R.c.Amorim Filho centre of Electrical Engineering and Informatics Federal University of Campina GrandeCampina GrandeBrazil Department of Electrical Engineering Federal University of Campina GrandeCampina GrandeBrazil

In this article,an analysis of heat transfer in a porcelain-housed ZnO surge arrester is presented.Due to the fact that ZnO-based surge arresters are key components for protection and reliability of electrical systems,it is necessary to seek techniques to assure correct assessment.In porcelain-housed arresters,the air gap leads to an increased thermal resistance between the ambient and the varistor column.consequently,a thermal analysis must consider convection and radiation heat transfer mechanisms,besides heat conduction.This study proposes the use of computational simulations in combination with thermography as a tool for a temperature-based estimation of the varistor state.For the analysis,temperature rise tests were performed in a 69-kV ceramic-housed arrester to measure material emissivity and produce data to fit the simulated response.Furthermore,the thermal response of the surge arresters subject to an impulsive energy input was evaluated.The simulations allow to relate varistors temperature and housing temperature with regard to a specified amount of dissipated power.The obtained results show that the used technique can be an effective method for arrester monitoring and may allow to define assessing criteria for a porcelain-housed arrester based on housing temperature measurements.

关键词： behaviour specified ambient

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Asymmetric hydrogenation and transfer hydrogenation in the enantioselective synthesis of flavonoids

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Organic chemistry Frontiers 2022年第4期9卷 1165-1194页

作者： Guilherme S.caleffi Felipe c.Demidoff carmen Najera Paulo R.R.costa Laboratorio de Quimica Bioorganica(LQB) Instituto de Pesquisas de Produtos NaturaisUniversidade Federal do Rio de JaneiroAv.Carlos Chagas Filho 373Bloco HCidade Universitaria21941-902 Rio de Janeiro centro de Innovacion en Quimica Avanzada(ORFEO-cINQA) Universidad de AlicanteApdo.99E-03080 AlicanteSpain

Asymmetric hydrogenation(AH)and asymmetric transfer hydrogenation(ATH)are versatile synthetic methodologies widely employed in the preparation of chiral compounds.In this review,we explore the applications of AH and ATH in the total synthesis of natural flavonoids and their analogues,highlighting the limitations and opportunities in the field.

关键词： compounds field hydrogenation

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Antiglycation and antioxidant activities of the crude extract and saponin fraction of Tribulus terrestris before and after microcapsule release

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Journal of Integrative medicine 2022年第2期20卷 153-162页

作者： célia cristina malaguti Figueiredo Amanda da costa Gomes Filipe Oliveira Granero Joao Luiz Bronzel Junior Luciana Pereira Silva Valdecir Farias Ximenes Regildo márcio Goncalves da Silva Institute of chemistry São Paulo State UniversityAraraquaraSão Paulo 14800-060Brazil Educational Foundation of the city of Assis AssisSão Paulo 19807-130Brazil Department of chemistry School of SciencesSão Paulo State UniversityBauruSão Paulo 17033-360Brazil Department of Biotechnology School of SciencesHumanities and LanguagesSão Paulo State UniversityAssisSão Paulo 19806-900Brazil

Objective:The present study investigated antiglycation and antioxidant activities of crude dry extract and saponin fraction of Tribulus terrestris.It also developed a method of microencapsulation and evaluated antiglycation and antioxidant activities of crude dry extract and saponin fraction before and after microcapsule release.methods:Antiglycation activity was determined by relative electrophoretic mobility(REm),free amino groups and inhibition of advanced glycation end-product(AGE)formation.Antioxidant activity was determined by 2,2-diphenyl-1-picrylhydrazyl(DPPH),ferric ion-reducing antioxidant power(FRAP),nitric oxide(NO)and thiobarbituric acid reactive species(TBARS)tests.microcapsules were prepared using maltodextrin as wall material and freeze-drying as encapsulation technique.morphological characterization of microcapsules was evaluated by scanning electron microscopy,and encapsulation efficiency and microcapsule release were determined by total saponins released.Antiglycation and antioxidant assays were performed using crude dry extract and saponin fraction of T.terrestris before and after release.Results:Saponin fraction showed an increase of 32.8%total saponins.High-performance liquid chromatography-mass spectrometry analysis showed the presence of saponins in the obtained fraction.Antiglycation evaluation by REm demonstrated that samples before and after release presented antiglycation activity similar to bovine serum albumin treated with aminoguanidine.Additionally,samples inhibited AGE formation,highlighting treatment with saponin fraction after release(89.89%).Antioxidant tests demonstrated antioxidant activity of the samples.crude dry extract before encapsulation presented the highest activities in DPPH(92.00%)and TBARS(32.49%)assays.Saponin fraction before encapsulation in FRAP test(499μmol Trolox equivalent per gram of dry sample)and NO test(15.13μmol nitrite formed per gram of extract)presented the highest activities.conclusion:This study presented antiglycation activity of crude dry extract

关键词： Glycation microencapsulation Oxidative stress Saponins Tribulus terrestris

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