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Multi-objective Adaptive Evolutionary Algorithm to Enhance Voltage Stability in Power Systems
Sidnei Nascimento,Maury M. Gouvêa Jr. 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
Problems with two or more conflicting objectives have been handled as needing a multi-objective approach in recent years. The solution for these types of problems is normally to satisfy the conflicting objectives simultaneously in order to find tradeoffs between different criteria. Optimization in power systems is an important example of how to tackle multi-objective problems since these systems have conflicting performance indicators and normally operate close to their constraints due to the continuous increase in demand. In this paper, a multi-objective approach is applied to the voltage stability problem in power systems by using an adaptive evolutionary algorithm. The proposed method regards examining the following stability indicators of power systems: the voltage profile, the total reactive power loss, and the voltage collapse margin as requiring a multi-objective approach. Several experiments were conducted in IEEE 14, 57, and 118 busbar systems by using the proposed method and other probabilistic and heuristic optimization methods. The results showed that the proposed adaptive evolutionary algorithm enhanced the voltage stability and outperformed the other methods, especially when the size of the power system increases.
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The Use of qNMR for Quality Control of Coumarin-based Pharmaceuticals and Plant Medicines
Luana C. Crocoli,Vinícius B. Molon,Sidnei Moura 한국생약학회 2021 Natural Product Sciences Vol.27 No.2
The Coumarin (1,2-benzopyrone) is the main secondary metabolite of Mikania laevigata Sch. Beep ex Baker and Mikania glomerata Spreng., which are popularly known as guaco. These plants have been used mainly in traditional medicine in the treatment of respiratory diseases because their bronchodilator effect. However, there are around 200 species of Mikania, which are quite similar in appearance. From these, only M. leavigata and M. glomerata have high concentrations of coumarins. In this line, the falsification of products Mikania based has been frequent. In this sense, this work demonstrated the application of the easy, fast, e not destructive method based in Nuclear Magnetic Resonance in quantitative mode (qNMR) for the determination of coumarin in both commercial and homemade guaco products. Thus, in the first step the compounds were extract from guaco leaves and syrups using chloroform (CHCl3), with or without ultrasound. About the method, was linear with a R2= 0.9947 for 1,2-benzopyrone, with detection and quantification limits with were 0.11 and 0.36 mg mL-1 respectively. In the same line, the method was safe with RSD <0.3% and with recovery ranging from 93-101%. To confirm the applicability of the method, in the last step was applied to 10 real samples (6 from leaves and 4 from syrups). The content of the coumarin in the leaf extract ranged from 0.62 to 1.30 mg mL-1. For syrups I, II and IV, the content of coumarin was in accordance with the manufacturers. However, for de Syrup III, the concentration was 155% higher. In summary, the qNMR is a rapid method with minimal sample preparation that can be used to quantify coumarin in home-made plant extracts as well as in commercial samples as syrup for instance. This method is applicable for quality control of different plants-based products.
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Vania Pezzini,Fabiana Agostini,Franco Smiderle,Luciana Touguinha,Mirian Salvador,Sidnei Moura 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.3
By-products of the grape juice industry containvaluable compounds. The current work produced bioactive-enriched extracts from by-products of the grape juice,through three different extraction methods. Yields andchemical compositions varied, according to the extractionmethod (ultrasound, microwave, liquid–liquid). High-efficiencyliquid chromatography with UV–Vis and high-resolutionmass spectrometry characterised were used forchemical characterization, with glycosylated flavonoidsevident. The crude extract was fractionated by open column,which has possibility carried-out fraction rich inresveratrol. The inhibition of DPPH radicals ranged from14.2 to 74.2%, and the total phenolic content ranged from0.1 to 107.0 mg gallic acid equivalents/100 g. Microwaveassistedextraction of grape juice by-products using polarsolvents, such as ethanol and water, provided the best yieldand chemical composition, obtaining extracts rich in flavonoids. In this way, this work has demonstrated theindustrial grape by-products importances, which are a richsource of antioxidants if properly extracted.
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Evaluation of Exogenous Promoters for Use in Brachiaria brizantha Transformation
Silveira Erica Duarte,Rodrigues Julio Carlyle Macedo,Cabral Glaucia Barbosa,Leite Juliana de Almeida,Costa Sidnei Souza,Carneiro Vera Tavares de Campos The Korean Society of Plant Biotechnology 2003 Plant molecular biology and biotechnology research Vol.5 No.2
Brachiaria (Poaceae) is the most important forage genus for cattle production in Brazil. The genetic breeding of this genus is limited by the incompatibility among species, differences in ploidy level and the natural cloning of plants by apomixis (Valle and Miles 1992). However, plant regeneration via tissue culture methods and genetic engineering provide an opportunity to introduce new characteristics in plants of this genus. We have developed methods for the 'genetic modification of Brachiaria brizantha cv. Marandu via biolistic transformation. A higher number of shoots was obtained with 4 mg/L 2.4-diclorophenoxyacetic acid and 0.2 mg/L benzylaminopurine in calli induction medium and 0.1 mg/L naphtaleneacetic acid and 4.0 mg/L kinetin in shoot regeneration medium. A selection curve for mannose was determined to use phospho mannose isomerase (PMI) gene of Escherichia coli as a selection marker. Calli formation was inhibited from 5 g/L mannose, even in the presence of sucrose while calli that were formed in the presence of mannose failed to develop embryos showing that PMI gene can be used for selection of transformants of this grass. Different promoters were tested to evaluate the efficiency based on the detection of the GUS gene expression (Jefferson et al. 1987). The monocot promoters, act1-D and ubi-1, resulted in higher expression levels than dicot promoters, ubi-3 and act-2, or the CaMV35S and CVMV promoters.
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