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Wool Fabric Dyeing with Natural Dye Extracted from Cinnamomum verum J. Presl Fruit
Fabricio Leal Ferreira,Élvio Antônio de Campos,Washington Luiz Félix Santos,Márcia Gomes da Silva 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
Given today’s market requirements and the growing awareness of producers and consumers about problems caused by synthetic dyes, natural dyes are a cost-effective and sustainable alternative for textile dyeing since they are highly biodegradable and pose a low risk to the environment and human health. Cinnamomum verum J. Presl is an evergreen tree whose fruit contains anthocyanin derivatives that can be used as a fabric dye. In this study, wool dyeing using natural dye extracted from the fruit of Cinnamomum verum J. Presl was evaluated to determine optimum dyeing conditions, such as temperature, pH level, and dyeing time and dyed samples through color intensity and the potassium alum mordant influence in the fastness to washing of dyed fabric, based on a colorimetric analysis performed in a spectrophotometer using the CIELab system. The conditions that resulted in the highest color intensity were pH 4, 100 °C, and a dyeing time of 60 min and were used to study the dyeing kinetics and balance of the dyeing process based on adsorption isotherms. It was found that the pseudo-second-order kinetic equation best represents the kinetics of wool dyeing and that it involves the chemical adsorption process. The Langmuir–Freundlich adsorption isotherm best fitted the experimental data, indicating that chemical adsorption significantly contributes to a monolayer. The results showed that the extract of Cinnamomum verum J. Presl fruit is a promising natural dye source for wool.
Analysis of thermal and damage effects over structural modal parameters
Fabricio A. Ortiz Morales,Alexandre A. Cury 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.1
Structural modal parameters i.e. natural frequencies, damping ratios and mode shapes are dynamic features obtained either by measuring the vibration responses of a structure or by means of finite elements models. Over the past two decades, modal parameters have been used to detect damage in structures by observing its variations over time. However, such variations can also be caused by environmental factors such as humidity, wind and, more importantly, temperature. In so doing, the use of modal parameters as damage indicators can be seriously compromised if these effects are not properly tackled. Many researchers around the world have found numerous methods to mitigate the influence of such environmental factors from modal parameters and many advanced damage indicators have been developed and proposed to improve the reliability of structural health monitoring. In this paper, several vibration tests are performed on a simply supported steel beam subjected to different damage scenarios and temperature conditions, aiming to describe the variation in modal parameters due to temperature changes. Moreover, four statistical methodologies are proposed to identify damage. Results show a slightly linear decrease in the modal parameters due to temperature increase, although it is not possible to establish an empirical equation to describe this tendency.
Fabricio A. Souza,Igor A. Magno,Marlo O. Costa,André S. Barros,Jacson M. Nascimento,Diego B. Carvalho,Otávio L. Rocha 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1
Aluminum casting alloys have properties which are of great industrial interest, such as low density, good corrosion resistance,high thermal and electrical conductivities, good combination of mechanical properties, good workability in machiningprocesses and mechanical forming. Currently, these alloys are produced in various systems and dozens of compositions. Inthis investigation, a mutual interaction of thermal parameters, scale of the dendritic microstructure, intermetallic compounds(IMCs), microhardness and tensile properties/fracture characteristics of a casting Al–7wt%Si–3wt%Cu–0.3wt%Fe alloywas analyzed. Solidification experiments were developed using a furnace that promoted horizontal growth under transientheat flow conditions. Then, growth rate (VL), cooling rate (CR), and local solidification time (tSL) were determined frommeasured temperature profiles. Secondary dendritic spacings (λ2), Si particles, Fe-rich and Al2Cuintermetallic phases werecharacterized by optical and SEM microscopy, as well as the area mapping and point-wise EDS microanalysis. Hence, theinterrelations involving Vickers microhardness (HV), yield strength (σYS), ultimate tensile strength (σUTS) and elongation(E%) with microstructural features were evaluated by mathematical equations. IMCs as well as morphologies of Si were alsoanalyzed in the fracture regions. In addition, the experimental growth law of λ2 = f(tSL) proposed in this study was comparedwith a predictive theoretical model reported in the literature for multicomponent alloys. It was observed that areas that tendto grow faster (lowest λ2 values) were associated with the highest σUTS and E% values, while HV and σYS properties were notaffected by the thermal and microstructural parameters (CR and λ2). In addition, less extensive cleavage planes accompaniedby small dimples in were observed in fractured samples with lower λ2 values.
Analysis of thermal and damage effects over structural modal parameters
Ortiz Morales, Fabricio A.,Cury, Alexandre A. Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.1
Structural modal parameters i.e. natural frequencies, damping ratios and mode shapes are dynamic features obtained either by measuring the vibration responses of a structure or by means of finite elements models. Over the past two decades, modal parameters have been used to detect damage in structures by observing its variations over time. However, such variations can also be caused by environmental factors such as humidity, wind and, more importantly, temperature. In so doing, the use of modal parameters as damage indicators can be seriously compromised if these effects are not properly tackled. Many researchers around the world have found numerous methods to mitigate the influence of such environmental factors from modal parameters and many advanced damage indicators have been developed and proposed to improve the reliability of structural health monitoring. In this paper, several vibration tests are performed on a simply supported steel beam subjected to different damage scenarios and temperature conditions, aiming to describe the variation in modal parameters due to temperature changes. Moreover, four statistical methodologies are proposed to identify damage. Results show a slightly linear decrease in the modal parameters due to temperature increase, although it is not possible to establish an empirical equation to describe this tendency.
Pedro Filho Noronha Souza,Fabricio Eulálio Leite Carvalho 한국식물학회 2019 Journal of Plant Biology Vol.62 No.3
As simple organisms with a parasite nature,viruses have become masters in manipulating and subvertcellular components, including host proteins and organelles,to improve viral replication. Therefore, the understanding ofviral strategies to manipulate cell function disrupting plantdefenses and enhancing viral infection cycles is fundamentalto the production of virus-resistant plant lines. After invadingsusceptible plants, viruses create conditions that favor localand systemic infections by suppressing multiple layers ofinnate host defenses while use cellular machinery to ownbenefit. Viral interference in interlinked essential cellularfunctions results in phenotypic changes and disease symptoms,which debilitates plants favoring infection establishment. Herein in this review, the novelty it will be the discussionabout the strategies used by (+) single strand RNA viruses toaffect cellular processes and components to improve viralreplication, in parallel to overcome plant defenses, favoringdisease establishment by applying in one action using thesame viral protein to coordinate viral replication and breakingdown plant defense. This focus on plant-virus interactionwas never done before, and this knowledge has the potentialto help in the development of new strategies to produceresistant plants.
Xu Wang,Galina Malovichko,Marcelo Mendonca,Fabricio Rochedo Conceicao,Jose AG Aleixo,Xiangdong Zhu 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
Surface protein internalin (InlA) is a major virulence factor of the food-borne pathogen L. monocytogenes. It plays an important role in bacteria crossing the host's barrier by specific interaction with the cell adhesionmolecule E-cadherin. Study of this protein will help to find better ways to prevent listeriosis. In this study,a monoclonal antibody against InlA was used to detect InlA. The reaction was label-free and monitoredin real time with an oblique-incidence reflectivity-difference (OI-RD) technique. The kinetic constants konand koff and the equilibrium dissociation constant Kd for this reaction were also obtained. These parametersindicate that the antibody is capable of detecting InlA. Additionally, the results also demonstrate thefeasibility of using OI-RD for proteomics research and bacteria detection.
Francisco José Arruda Mont`Alverne,Fabricio Oliveira Lima,Felipe de Araújo Rocha,Diego de Almeida Bandeira,Adson Freitas de Lucena,Henrique Coelho Silva,이진수,Raul Gomes Nogueira 대한뇌졸중학회 2020 Journal of stroke Vol.22 No.2
The benefit of mechanical thrombectomy (MT) in acute ischemic stroke (AIS) due to large vessel intracranial occlusions is directly related to the technical success of the procedures in achieving fast and complete reperfusion. While a precise definition of refractoriness is lacking in the literature, it may be considered when there is reperfusion failure, long procedural times, or high number of passes with the MT devices. Detailed knowledge about the causes for refractory MT in AIS is limited; however, it is most likely a multifaceted problem including factors related to the vascular anatomy and the underlying nature of the occlusive lesion amongst other factors. We aim to review the impact of several key unfavorable anatomical factors that may be encountered during endovascular AIS treatment and discuss potential bail-out strategies to these challenging situations.