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The Evaluation of Polyethylene/Clay Composite from Solid State NMR

Materials Sciences and Applications 2011年第5期2卷 453-457页

作者： Regina F.Nogueira Maria Ines B.Tavares Rosane A.S.San gil antonio g.ferreira Departamento de Quimica Universidade Federal de Sao CarlosSao CarlosBrasil Laboratorio de Nanocompositos Polimericos Instituto de Macromoleculas Professora Eloisa Mano da Universidade Federal do Rio de JaneiroRio de JaneiroBrasil Departamento de Quimica Organica da Universidade Federal do Rio de JaneiroRio de JaneiroBrasil

Polymeric nanocomposites based on polyethylene (PE) and Brazilian natural montmorillonite clay (MN) were obtained by melt processing, using a twin-screw extruder. The main objective of this work is focusing on the characterization of composites materials by solid-state nuclear magnetic resonance (NMR). The solid-state NMR measurements were used to observe both polymer matrix (through carbon-13 and hydrogen nuclei) and the clay (silicon-29 and aluminum-27). The polymer matrix analyses were carried out applying solid state techniques, such as: cross-polarization magic angle spinning (CPMAS), variable contact time (VCT) and by the proton spin-lattice relaxation time in the rotating frame parameter (T1ρH), detected from the resolved carbon-13 decay of the VCT experiment and through the determination of spin-lattice relaxation time, T1H (using low field NMR). The clay was analyzed by 29Si and 27Al, employing MAS NMR technique. From those techniques we can have principally response on clay dispersion in the polyethylene matrix, as well as the interactions between both components in the nanostructured material. The T1H response was an important result which showed, that the materials formed, presented different molecular domains (according to the domain size that varied from 25 to 50 nm, measured by relaxation), considering the clay dispersion mode in terms of intercalation and/or exfoliation in the polymer matrix.

关键词： NMR Polymer Polyethylene Clay Montmorillonite

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Catalytic combustion of soot over ceria-zinc mixed oxides catalysts supported onto cordierite

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Journal of Environmental Sciences 2014年第3期26卷 694-701页

作者： Leandro Fontanetti Nascimento Renata Figueredo Martins Rodrigo ferreira Silva Osvaldo antonio Serra Department of Chemistry FFCLRP University of Sao Paulo

Modified substrates as outer heterogeneous catalysts was employed to reduce the soot generated from incomplete combustion of diesel or diesel/biodiesel blends, a process that harms the environment and public health. The unique storage properties of ceria （CeO2） makes it one of the most efficient catalysts available to date. Here, we proposed that ceria-based catalysts can lower the temperature at which soot combustion occurs; more specifically, from 610℃ to values included in the diesel exhausts operation range （300-450℃）. The sol-gel method was used to synthesize mixed oxide-based catalysts （CeO2：ZnO）; the resulting catalysts were deposited onto cordierite substrates. In addition, the morphological and structural properties of the material were evaluated by XRD, BET, TPR-H2, and SEM. Thermogravimetric （Tg/DTA） analysis revealed that the presence of the catalyst decreased the soot combustion temperature by 200℃ on average, indicating that the oxygen species arise at low temperatures in this situation, promoting highly reactive oxidation reactions. Comparative analysis of soot emission by diffuse reflectance spectroscopy （DRS） showed that catalyst-impregnated cordierite samples efficiently oxidized soot in a diesel/biodiesel stationary motor： soot emission decreased by more than 70%.

关键词： soot oxidation mixed oxides ceria

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SimTCM: A human patient simulator with application to diagnostic accuracy studies of Chinese medicine

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Journal of Integrative Medicine 2015年第1期13卷 9-19页

作者： Arthur de Sá ferreira antonio guilherme Pacheco Postgraduation Program in Rehabilitation Science Augusto Motta University Center Program of Scientific Computing

OBJECTIVE： The aim of this work is to develop and implement the SimTCM, an advanced computationa model that incorporates relevant aspects from traditional Chinese medicine （TCM） theory as well as advanced statistical and epidemiological techniques for simulation and analysis of human patients. METHODS： SimTCM presents five major attributes for simulation： representation of true and false profiles for any single pattern; variable count of manifestations for each manifestation profile; empirical distributions of patterns and manifestations in a disease-specific population; incorporation of uncertainty in clinical data; and the combination of the four examinations. The proposed model is strengthened by following international standards for reporting diagnostic accuracy studies, and incorporates these standards in its treatment of study population, sample size calculation, data collection of manifestation profiles, exclusion criteria and missing data handling, reference standards, randomization and blinding and test reproducibility. RESULTS： Simulations using data from patients diagnosed with hypertension and post-stroke sensory- motor impairments yielded no significant differences between expected and simulated frequencies of patterns （P = 0.22 or higher）. Time for convergence of simulations varied from 9.90 s （9.80, 10.27） to 28.31 s （26.33, 29.52）. The ratio iteration profile necessary for convergence varied between 1：1 and 5：1. CONCLUSION： This model is directly connected to forthcoming models in a large project to design and implement the Suite TCM： ProntTCM, SciTCM, DiagTCM, StudentTCM, Research TCM, HerbsTCM, AcuTCM, and DataTCM. It is expected that the continuity of the SuiteTCM project enhances the evidence-based practice of Chinese medicine.

关键词： medicine, Chinese traditional evidence-based medicine computer-assisted decision making rehabilitation medicine (TCM)

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Activation of non-basalslip in multicomponent Mg alloy

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Journal of Magnesium and Alloys 2022年第2期10卷 629-642页

作者： Hyo-Sun Jang Jong-Kwan Lee antonio João Seco ferreira Tapia Nack Joon Kim Byeong-Joo Lee Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea graduate Institute of Ferrous Technology Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

Activating non-basalslip is a key method to improve room temperature ductility and formability of Mg ***,the detailed criterion for activation of theslip in multicomponent Mg alloys,which can be utilized in commercial Mg alloys,requires further *** present authors investigated the mechanism and criterion using a molecular statics simulation on dislocation behaviors in multicomponent Mg *** found that if multicomponent Mg alloys have an equivalent dislocation binding intensity to associated binary Mg alloys that are optimized to minimize the critical resolved shear stress anisotropy and thus activate theslip,then the critical resolved shear stress anisotropy between slip systems of the multicomponent Mg alloys can also be minimized,resulting in activation of the*** activation is maximized in multicomponent Mg alloys when alloying a large amount of weak dislocation binding *** was confirmed through experiments that the multicomponent Mg alloys satisfying the above criterion show higher room-temperature tensile elongation and formability than other alloys.

关键词： Mg–Zn–Ca alloy Molecular statics simulation Ductility Formability

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Parameter Estimation for Hot-spot Thermal Model of Power Transformers Using Unscented Kalman Filters

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 634-642页

作者： MiguelÁngel gonzález-Cagigal Joséantonio Rosendo-Macías antonio gómez-Expósito Department of Electrical Engineering University of SevilleSevilleSpain ENgREEN Laboratory of Engineering for Energy and Environmental Sustainability SevilleSpain

This paper presents a parameter estimation technique for the hot-spot thermal model of power *** proposed technique is based on the unscented formulation of the Kalman filter,jointly considering the state variables and parameters of the dynamic thermal model.A two-stage estimation technique that takes advantage of different loading conditions is developed,in order to increase the number of parameters which can be *** results are presented,which show that the observable parameters are estimated with an error of less than 3%.The parameter estimation procedure is mainly intended for factory testing,allowing the manufacturer to enhance the thermal model of power transformers and,therefore,its customers to increase the lifetime of these *** proposed technique could be additionally considered in field applications if the necessary temperature measurements are available.

关键词： Parameter estimation power transformer unscented Kalman filter thermal model

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Impact of rheumatoid arthritis on sexual function

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World Journal of Orthopedics 2014年第2期5卷 107-111页

作者： antonio g Tristano Rheumatology Department Centro Médico Docente La Trinidad 1080-A Caracas Venezuela Centro Medico Carpetana 28025 MadridSpain

Sexuality is a complex aspect of the human being's life and is more than just the sexual act. Normal sexual functioning consists of sexual activity with transition through the phases from arousal to relaxation with no problems, and with a feeling of pleasure, fulfillment and satisfaction. Rheumatic diseases may affect all aspects of life including sexual functioning. The reasons for disturbing sexual functioning are multifactorial and comprise disease-related factors as well as *** arthritis(RA) is a chronic inflammatory autoimmune disease characterized by progressive joint destruction resulting from chronic synovial inflammation. It leads to various degrees of disability, and ultimately has a profound impact on the social, economic,psychological, and sexual aspects of the patient's *** is a systemic review about the impact of RA on sexual functioning.

关键词： Sexuality Sexual functioning Sexual dysfunction Rheumatoid arthritis

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Mulching as best management practice to reduce surface runoff and erosion in steep clayey olive groves

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International Soil and Water Conservation Research 2021年第1期9卷 26-36页

作者： giuseppe Bombino Pietro Denisi JoséAlfonso gómez Demetrio antonio Zema Mediterranea University of Reggio Calabria Department"Agraria"LocalitàFeo di Vito1-89122Reggio CalabriaItaly Institute for Sustainable Agriculture(IAS-CSIC) Agronomy DepartmentAvenida Menéndez Pidal s/nE-14004CórdobaSpain

No-tillage and soil mulching with pruning residues,applied in olive groves of the semi-arid Mediter-ranean environment,as erosion control practices still practice not fully *** study has evaluated the saturated hydraulic conductivity(Ksat),surface runoff(SR)and soil erosion(SL)under rainfall at plot scale throughout two years in four different management practices,total soil cover with a net(SP),mechanical tillage(MT)and mulching by vegetal residues at 3,5·10^(3) and 17,5·10^(3) kg ha^(-1) of dry matter(NTR350 and NTR1750),in an olive grove of Southern *** varied between 1.6(MT)and 25.1(NTR1750)mm/h.A clear reduction in runoff and soil losses was detected for the mulch-based practices when compared to MT,from 20 to 32%in the runoff coefficient and 75-80%in SL,with higher reductions in the *** reduction in SL can be mainly explained by the reduction in SR and rain-splash,interrill and rill erosion,due to protection by mulch residues,which increased the vegetal cover and organic matter content of mulched *** vegetal cover was on average higher in SP(33%),NTR1750(25%)and NTR350(22%),and lower in MT(12%).The mean organic matter content of soil was 2.01%,1.69%,1.34%and 0.82%for NTR1750,NTR350,SP and MT ***,the results quantify the impact of soil mulching with pruning residues at different doses,which will provide guidelines to control and mitigate the hydrological response of clayey and steep soils in Mediterranean olive groves,analysing the associated environmental and economic benefits.

关键词： Pruning residues Tillage Soil loss Vegetal cover Organic matter Soil hydraulic conductivity

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A Holistic State Estimation Framework for Active Distribution Network with Battery Energy Storage System

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Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 627-636页

作者： Shaojian Song Huangjiao Wei Yuzhang Lin Cheng Wang antonio gómez-Expósito IEEE School of Electrical Engineering Guangxi UniversityNanning 530004China Department of Electrical and Computer Engineering University of MassachusettsLowellMA 01852USA State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Laboratory of Engineering for Energy and Environmental Sustainability University of SevilleSpain

Battery energy storage systems(BESSs)are expected to play a crucial role in the operation and control of active distribution networks(ADNs).In this paper,a holistic state estimation framework is developed for ADNs with BESSs integrated.A dynamic equivalent model of BESS is developed,and the state transition and measurement equations are *** on the equivalence between the correction stage of the iterated extended Kalman filter(IEKF)and the weighted least squares(WLS)regression,a holistic state estimation framework is proposed to capture the static state variables of ADNs and the dynamic state variables of BESSs,especially the state of charge(SOC).A bad data processing method is also *** simulation results show that the proposed holistic state estimation framework improves the accuracy of state estimation as well as the capability of bad data detection for both ADNs and BESSs,providing comprehensive situational awareness for the whole system.

关键词： Active distribution network(ADN) anomaly detection battery energy storage system(BESS) Kalman filtering situational awareness state estimation state of charge(SOC)

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Self-Blowing Non-Isocyanate Polyurethane Foams Based on Hydrolysable Tannins

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Journal of Renewable Materials 2022年第12期10卷 3217-3227页

作者： Elham Azadeh Xinyi Chen antonio Pizzi Christine gérardin Philip gérardin Hisham Essawy Facultédes Sciences et Technologies LERMABEA 4370-USC INRAEUniversity of LorraineBlvd des AiguillettesNancy54506France LERMAB EA 4370-USC INRAEUniversity of Lorraine27 rue Philippe SeguinEpinal88000France Department of Polymers and Pigments National Research CenterCairo12622Egypt

ABSTRACT Non-isocyanate polyurethane(NIPU)foams using a hydrolysable tannin,also vulgarly called tannic acid,namely here commercial chestnut wood tannin extract was *** strength did not appear to depend on the foam apparent density while the formulation composition of the NIPU foams has been shown to be more *** NIPU foams appeared to be self-extinguishing once the high temperature flame is *** ignition time gave encouraging results but for improved fire resistance the foams may need some fire-retardant *** spectrometry showed the formation of non-isocyanate urethane *** analysis indicated a good thermal resistance of these foams,with thermal degradation following four *** in the interval 25℃–120℃ range,mainly evaporation of water occurs with a maximal loss of 10%*** the 150℃–450℃ temperature range foams mass loss is of almost 70%.In particular in the 125℃–275℃ range occurs the degradation of some small molecular weight *** the 500℃–790℃ temperature range the foams do not present any further large degradation.

关键词： Non-isocyanate biopolyurethanes(NIPU) biofoams chestnut tannin hydrolysable tannins self-extinguishing

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Liver volumetric and anatomic assessment in living donor liver transplantation: The role of modern imaging and artificial intelligence

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World Journal of Transplantation 2023年第6期13卷 290-298页

作者： Mayara Machry Luis Fernando ferreira Angelica Maria Lucchese antonio Nocchi Kalil Flavia Heinz Feier Department of Hepato-Biliary-Pancreatic Surgery and Liver Transplantation Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90020-090Brazil Postgraduation Program in Medicine:Hepatology Federal University of Health Sciences of Porto AlegrePorto Alegre 90050-170Brazil

The shortage of deceased donor organs has prompted the development of alternative liver grafts for ***-donor liver transplantation(LDLT)has emerged as a viable option,expanding the donor pool and enabling timely transplantation with favorable graft function and improved long-term *** accurate evaluation of the donor liver’s volumetry(LV)and anatomical study is crucial to ensure adequate future liver remnant,graft volume and precise liver ***,ensuring donor safety and an appropriate graftto-recipient weight *** LV(MLV)using computed tomography has traditionally been considered the gold standard for assessing liver ***,the method has been limited by cost,subjectivity,and *** LV techniques employing advanced segmentation algorithms offer improved reproducibility,reduced variability,and enhanced efficiency compared to manual ***,the accuracy of automated LV requires further *** study provides a comprehensive review of traditional and emerging LV methods,including semi-automated image processing,automated LV techniques,and machine learning-based ***,the study discusses the respective strengths and weaknesses of each of the aforementioned *** use of artificial intelligence(AI)technologies,including machine learning and deep learning,is expected to become a routine part of surgical planning in the near *** implementation of AI is expected to enable faster and more accurate image study interpretations,improve workflow efficiency,and enhance the safety,speed,and cost-effectiveness of the *** preoperative assessment of the liver plays a crucial role in ensuring safe donor selection and improved outcomes in *** has inherent limitations that have led to the adoption of semi-automated and automated software ***,AI has tremendous potential for LV and segmentation;however,its widespread use is hindered

关键词： Liver transplantation Living-donor Diagnostic imaging Artificial intelligence Machine learning Deep learning

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