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Integrated operational planning of hydrothermal power and natural gas systems with large scale storages

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 299-313页

作者： Diego Mauricio OJEDA-ESTEYBAR ricardo German RUBIO-barros Alberto VARGAS Instituto de Energı´a Ele´ctrica(IEE) Universidad Nacional de San Juan(UNSJ)Consejo Nacional de Investigaciones Cientı´ficas y Tecnolo´gicas(CONICET)Av.Libertador Gral.San Martı´n West 11095400 San JuanArgentina

The growing installation of natural gas fired power plants has increased the integration of natural gas and electricity sectors. This has driven the need investigate the interactions among them and to optimize energy resources management from a centralized planning perspective. Thus, a combined modeling of the reservoirs involved in electric power and gas systems and their locations on both networks are essential features to be considered in the operational planning of energy *** paper presents a modeling and optimization approach to the operational planning of electric power and natural gas systems, taking into account different energy storage facilities, such as water reservoirs, natural gas storages and line packs of pipelines. The proposed model takes advantage of captures both energy systems synergy and their associated networks. This approach identifies the interactions between the energy storage facilities and their economic impact over their optimal scheduling. The results show the benefits of an integrated operational planning of electric power and natural gas systems, the close interdependency between the energy resources stored in both systems, and the effects of a combined scheduling.

关键词： Energy storage Hydrothermal scheduling Integrated operational planning Integrated energy systems Natural gas

Retention of eucalyptus harvest residues reduces soil compaction caused by deep subsoiling

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Journal of Forestry Research 2022年第2期33卷 643-651页

作者： Raphael Oliveira de Melo AymbiréAngeletti da Fonseca Nairam Félix de barros Raphael Bragança Alves Fernandes Rafael da Silva Teixeira Iago Nery Melo ricardo Previdente Martins Soil Science Department Universidade Federal de ViçosaViçosaMinas GeraisBrazil BRACELL Company AlagoinhasBahiaBrazil

Eucalyptus harvesting,forwarding and soil tillage operations are among the main causes for compaction of forest soils,with potential impacts on *** concern is especially important in areas with soils that are naturally compacted(fragipans and duripans).In these soils,tillage operations include the use of subsoilers that can reach depths of more than one meter and require heavy tractors that exert high pressure on the *** of the ways to try to minimize the effect of this compaction is by retaining harvest *** objective of this study was to evaluate the impacts of eucalyptus harvesting on soil physical attributes,as well as to determine the potential of different types of residue management to reduce compaction from the soil tillage *** experiments were conducted in the same area with a Yellow *** the first experiment,compaction caused by mechanized harvesting with harvester+forwarder was *** the second experiment,different managements of harvest residues were examined as potential modifiers of soil compaction during tillage for new *** this,three managements systems were tested:(1)retention of all harvest residues and litter from the previous rotation(HR+L),(2)retention of litter from the previous rotation(L),and(3)removal of harvest residues and litter from the previous rotation(WR).Before and after harvest,sampling was carried out in the planting rows and inter-rows,and after tillage,samples were collected in the traffic line of the subsoiler-tractor *** both experiments,undisturbed soil samples were collected from the center of the 0-10,10-20,20-40,40-60,and 60-100 cm layers to determine soil density and total *** each period and site of evaluation,mechanical resistance to penetration up to the 60-cm depth was also *** harvesting operation increased soil density at 0-10 and 60-100 cm depths only in the *** of harvest residues and litter(HR+L)after harvesting avoi

关键词： Soil penetration resistance Harvester+forwarder Soil tillage Soil density Cohesive soils

Does landscape context affect pollinationrelated functional diversity and richness of understory flowers in forest fragments of Atlantic Rainforest in southeastern Brazil?

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Ecological Processes 2020年第1期9卷 737-748页

作者： Karoline Baptista de Lima Patrícia Alves Ferreira Milton Groppo Renato Goldenberg Emerson ricardo Pansarin Roxana Cardoso Barreto Guilherme Peres Coelho Yago barros-Souza Danilo Boscolo Biology Department Faculty of PhilosophySciences and LettersUniversity of São PauloRibeirão PretoSP 14040-901Brazil National Institute of Science and Technology in Interdisciplinary and Transdisciplinary Studies in Ecology and Evolution(IN-TREE) SalvadorBrazil Botany Department Biological Science SectorParanáFederal UniversityCuritibaPR 81531-970Brazil Botany Department Biological Science CenterPernambuco Federal UniversityRecifePE 50670-420Brazil Institute of Bioscience Rio Grande do Sul Federal UniversityPorto AlegreRS 90040-060Brazil Botany Department Federal University of São CarlosSão CarlosSP 13565-905Brazil.

Background:How landscape modifications affect functional diversity of floral characteristics pertinent to pollinators is poorly *** possess functional traits that sometimes coevolved with pollinators,crucial for the maintenance of both pollinator and plant *** evaluated how richness and functional diversity of available understory flowers respond to forest cover and landscape heterogeneity in a multiscale *** in bloom were sampled from 25 landscapes in the understory of Atlantic Forest fragments in *** were classified into functional groups regarding flower characteristics relevant to *** heterogeneity and forest cover were measured in buffers ranging from 200 to 2000 m from sampling units and their correlation with plant richness and functional diversity was assessed using generalized linear models and further model selection through Akaike’s second-order information ***:Plants’richness and functional diversity were affected negatively by forest *** former responded to forest cover at a regional scale while the latter responded at a local *** landscape heterogeneity increased richness and functional ***:Our results showed that forest cover and landscape heterogeneity are important to support biodiversity related to pollination,mostly due to the availability of diversified resources and nesting sites associated to different land-uses for pollinators and flowering plant *** findings should highlight,along with forest cover,landscape heterogeneity as an environmental management priority in rural tropical areas for mitigating the loss of plant biodiversity and enhancing ecosystem functioning.

关键词： Functional diversity Pollination Landscape heterogeneity Forest cover Understory plant community

Effects of the seasonal variation in the phytochemical composition and bioactivities of the wild halophyte Suaeda fruticosa

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Food Bioscience 2022年第6期50卷 1805-1811页

作者： Mariem Maatallah Zaier Sandrina A.Heleno Filipa Mandim ricardo C.Calhelha Isabel C.F.R.Ferreira Lotfi Achour Adnane Kacem Maria Inês Dias Lillian barros Research Laboratory LR14ES06: Bioresources: Integrative Biology and Valorization High Institute of Biotechnology of MonastirUniversity of MonastirTahar Haddad StreetMonastir5000Tunisia Centro de Investigação de Montanha (CIMO) Instituto Politécnico de BragançaCampus de Santa Apolónia5300-253BragançaPortugal Laboratório Associado para a Sustentabilidade e Tecnologia em Regiões de Montanha (SusTEC) Instituto Politécnico de BragançaCampus de Santa Apolónia5300-253BragançaPortugal

Suaeda fruticosa is an edible medicinal species belonging to the Amaranthaceae (Chenopodiaceae) family widely distributed in the Mediterranean regions, especially in Tunisia. This species shoots change their colour from green to red-violet along the different seasons, being an interesting matrix to study for its chemical composition. Therefore, in a ground-breaking study, the hydromethanolic extracts of green and red-violet Tunisian S. fruticosa shoots were profiled for their individual phenolic compounds and betalains by High Performance Liquid Chromatography coupled with a Diode-Array Detector and Mass Spectrometry by Electrospray Ionization (HPLC-DAD/ESI-MS), and the in vitro antioxidant, antibacterial, and hepatotoxic properties were also assessed. The obtained results revealed that the hydromethanolic extracts contain interesting levels of phenolic compounds especially O-glycosylated and acylated flavonoids, while betacyanins were the main betalain compounds found. As expected, red-violet shoots were richer in phenolic compounds (45.5 ± 0.2 mg/g extract) and betalains (33.3 ± 0.2 mg/g extract) than greener shoots. Flavonoid/betalains rich extracts presented lower EC50 values for ABTS+, DPPH, and TBARS;as also lower MIC values against Gram-positive bacteria. This study showed that the wild halophyte growing in a hard environment, were drought and salinity are dominant, is an important source of flavonoids and betanin, important molecules that can find application in different industries, given the constant demands for natural bioactives and colouring compounds. Overall, these natural compounds may be valorised and further investigated to validate their potential as functional ingredients.

关键词： Halophyte Suaeda fruticosa HPLC-DAD/ESI-MS O-glycosylated and acylated flavonoids Betalains Bioactivities

Multifunctional Nanostructured Materials Applied in Controlled Radiopharmaceuticals Release

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Journal of Biomaterials and Nanobiotechnology 2012年第2期3卷 163-168页

作者： Raquel Cristina de Sousa Azevedo Daniel Crístian Ferreira Soares ricardo Geraldo de Sousa Edésia Martins barros de Sousa Centro de Desenvolvimento da Tecnologia Nuclear(CDTN)/CNEN Serviço de NanotecnologiaBelo HorizonteBrazil Departa-mento de Engenharia Química Universidade Federal de Minas GeraisBelo HorizonteBrazil

The metaiodobenzylguanidine (MIBG) radiopharmaceutical, an analogue of norepinephrine, has been used to diagnose certain diseases in the cardiovascular system when radiolabeled with 123I. This radiopharmaceutical can also be used to treat tumors, such as neuroblastomas and pheochromocytomas, when radiolabeled with 131I. Its clinical use is often accompanied by a slow intravenous administration, where a significant dose of radiation can directly affect workers in nuclear medicine services. To overcome this problem, the incorporation and controlled release of radiopharmaceuticals from the matrix of mesoporous systems based on silica, such as SBA-15 and hybrid [SBA-15/P(N-iPAAm)], can lead to a significant reduction in radiation doses received by workers. In the present study, silica matrices SBA-15 and hybrid [SBA-15/P(N-iPAAm)] containing the radiopharmaceutical MIBG were prepared and physicochemically characterized through FTIR, SEM, and small angle X-ray diffraction techniques. The release profiles of MIBG from SBA-15 and [SBA-15/P(N-iPAAm)] were studied in a simulated body fluid (SBF) to evaluate their potential application as vehicles for controlled releases. Furthermore, in vitro studies were performed to assess the cytotoxicity of matrices as compared to human lung fibroblast cells (MRC-5). The results revealed that the amount of MIBG incorporated within the studied matrices was indeed quite different, showing that only the hybrid [SBA-15/P(N-iPAAm)] system allowed for a more adequate release profile of MIGB. Taking all results into consideration, it can be concluded that the hybrid matrix [SBA-15/P(N-iPAAm)] can be considered a potential alternative material for the controlled release delivery of radio-pharmaceuticals.

关键词： SAB-15 Hybrid[SBA-15/P(N-iPAAm)] MIGB Radiopharmaceutical Drug Release

Patogenic and Indicator Microorganisms in Chicken Cuts Sold in the Recôncavo-Bahia-Brazil

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Food and Nutrition Sciences 2017年第11期8卷 1028-1038页

作者： Wanessa Karine Da Silva Lima Ludmilla Santana Soares barros ricardo Mendes Da Silva Tamiles Barreto De Deus Adriana Dos Santos Silva Danuza Das Virgens Lima Centro de Ciências Agrárias Ambientais e Biológicas Universidade Federal do Rec&ocirc ncavo da Bahia Cruz das Almas Bahia

Hygiene-sanitary conditions, the presence of Salmonella spp. and indicator microorganisms of chicken cuts sold on the market in the Rec?ncavo da Bahia area, are analyzed and their co-relationship with conditions of commercialization is verified. Sixty samples were collected between May and August 2016 at informal selling sites (fairs, butcher shops, abattoirs) and in supermarkets of ten municipalities of the Rec?ncavo da Bahia region. Hygiene and sanitary conditions were assessed through a check list. Total coliforms, Escherichia coli, mesophylls, psychrotrophic organisms, molds and yeast, and Salmonella spp. were counted. Results revealed statistical difference for total coliforms and Escherichia coli only, featuring greater concentration rates in fairs, butcher shops and abattoirs. Further, 31.7% of samples indicated 31.7% Salmonella spp. and 16.6% of samples failed to comply with sanitary legislation on Escherichia coli. Observational analysis demonstrated that 61.83% and 38.1% of the samples respectively on informal sites and in supermarkets did not comply with legislation and indicated a co-relationship of some variables with the growth of total coliforms, Escherichia coli and mesophylls. Pathogenic and indicator microorganisms suggest flaws in hygiene and sanitary conditions in the commercialization of chicken cuts and health risks to consumers.

关键词： Microbiological Contamination Hygiene and Sanitary Conditions Salmonella Chickens

Hygienic and Sanitary Conditions of Eggs Commercialized in Town Fairs and Markets

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Food and Nutrition Sciences 2018年第7期9卷 855-867页

作者： Wanessa Karine da Silva Lima Ludmilla Santana Soares barros ricardo Mendes da Silva Tamiles Barreto de Deus Danuza das Virgens Lima Adriana dos Santos Silva Center for Agrarian Environmental and Biological Sciences Federal University of Rec&ocirc ncavo da Bahia Cruz das Almas Brazil

High nutritional content coupled with low cost and ease of purchase justifies the frequent use of chicken eggs. Even with technological innovations in the production, storage, and distribution of eggs, food poisoning continues to occur. Therefore, in the present study, we 1) evaluated the microbiological profile and the hygienic and sanitary quality of eggs commercialized in town fairs and markets and 2) verified whether there is any correlation between microbiological results and commercialization conditions. Thirty-six samples were collected from six municipalities in the region of Rec?ncavo from Bahia, Brazil. The hygienic and sanitary conditions were analyzed by quantifying the total coliforms, E. coli, mesophilic and psychrotrophic microorganisms, molds, and yeasts, and by the presence of Salmonella sp. The observational analysis showed that 91% and 68% of the samples in town fairs and markets, respectively, did not comply with the requirements of the current Brazilian legislation. There was no significant difference in the microbiological profile among samples from the fairs and markets. Several samples presented relevant significant values, indicating inadequate hygienic conditions and fecal contamination. Salmonella sp. was found in one sample. There was co-relationship between microorganism count and the variables “external dirt”, “external stains”, and “closeness to other products”, with high concentrations of total coliforms and E. coli in the non-conforming samples. Although no limits exist for mold and yeast counts, the presence of fungi makes the product unfit for consumption. Thus, the commercialization of eggs would benefit from more attention and supervision by the relevant authorities.

关键词： Contamination Egg Salmonella Microorganism Indicator Hygiene Condition

Proton nuclear magnetic resonance-based metabonomic models for non-invasive diagnosis of liver fibrosis in chronic hepatitis C:Optimizing the classification of intermediate fibrosis

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World Journal of Hepatology 2018年第1期10卷 105-115页

作者： Andrea Dória Batista Carlos Jonnatan Pimentel barros Tássia Brena barroso Carneiro Costa Michele Maria Goncalves de Godoy Ronaldo Dionísio Silva Joelma Carvalho Santos Mariana Montenegro de Melo Lira Norma ThoméJucá Edmundo Pessoa de Almeida Lopes ricardo Oliveira Silva Postgraduate Program in Tropical Medicine Center for Health SciencesUniversidade Federal de PernambucoRecifePernambuco 50670-901Brazil Department of Gastroenterology and Hepatology Hospital das ClínicasUniversidade Federal de PernambucoRecifePernambuco 50670-901Brazil Department of Fundamental Chemistry Center for Exact and Nature SciencesUniversidade Federal de PernambucoRecifePernambuco 50670-901Brazil Intensive Care Unit Hospital das ClínicasUniversidade Federal de PernambucoRecifePernambuco 50670-901Brazil Department of Pathology Hospital das ClínicasUniversidade Federal de PernambucoRecifePernambuco 50670-901Brazi

AIM To develop metabonomic models(MMs), using 1 H nuclear magnetic resonance(NMR) spectra of serum, to predict significant liver fibrosis(SF: Metavir ≥ F2), advanced liver fibrosis(AF: METAVIR ≥ F3) and cirrhosis(C: METAVIR = F4 or clinical cirrhosis) in chronic hepatitis C(CHC) patients. Additionally, to compare the accuracy of the MMs with the aspartate aminotransferase to platelet ratio index(APRI) and fibrosis index based on four factors(FIB-4). METHODS Sixty-nine patients who had undergone biopsy in the previous 12 mo or had clinical cirrhosis were included. The presence of any other liver disease was a criterion for exclusion. The MMs, constructed using partial least squares discriminant analysis and linear discriminant analysis formalisms, were tested by cross-validation, considering SF, AF and C. RESULTS Results showed that forty-two patients(61%) presented SF, 28(40%) AF and 18(26%) C. The MMs showed sensitivity and specificity of 97.6% and 92.6% to predict SF; 96.4% and 95.1% to predict AF; and 100% and 98.0% to predict C. Besides that, the MMs correctly classified all 27(39.7%) and 25(38.8%) patients with intermediate values of APRI and FIB-4, respectively. CONCLUSION The metabonomic strategy performed excellently in predicting significant and advanced liver fibrosis in CHC patients, including those in the gray zone of APRI and FIB-4, which may contribute to reducing the need for these patients to undergo liver biopsy.

关键词： Metabolomics Nuclear magnetic resonance spectroscopy Chronic hepatitis C Liver fibrosis Surrogate markers

Remote Sensing Applied to the Evaluation of Spatial and Temporal Variation of Water Quality in a Coastal Environment, Southeast Brazil

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Journal of Geographic Information System 2019年第5期11卷 500-521页

作者： Pedro Bettencourt Julio Cesar Wasserman Fábio Ferreira Dias Paulo Roberto Alves Dandara Bernardino Bezerra Camila Américo Santos Luis Perez Zotes Sérgio ricardo barros Post-Graduate Program in Sustainable Systems Management UFF Niterói Brazil Post-Graduate Program in Geochemistry UFF Niterói Brazil Department of Geoenvironmental Analysis UFF Niterói Brazil Pós graduao em Biologia Marinha e Ambientes Costeiros UFF Niterói Brazil Pós graduao em Engenharia de Biossistemas UFF Niterói Brazil.

The monitoring of water quality in large coastal regions demands great analytical efforts through the collection of many samples, over long periods. Remote sensing is a reliable tool that can provide valuable information on the spatial and temporal variations of environmental parameters, particularly turbidity and chlorophyll a. The aim of the present research was to evaluate the spatial and temporal distribution of water quality from 2005 to 2017 along the north coast of São Paulo and its responses to the implementation of industrial developments and to variations in rainfall. Fifty-two MODIS images were used, showing concentrations of chlorophyll a and turbidity, in the dry season and wet season, from 2005 to 2017. The results showed that dilution processes (due to rainfall) control chlorophyll a concentrations. However, a notable increase in concentrations could be identified after the installation of some of the developments in the region, particularly roads and ports. Turbidity was also shown to be affected by dilution processes, and during the wet season this parameter presented lower values. No effect in the results of turbidity could be identified from the installation of roads or ports, showing that vegetation cover exerts an important control on the erosional processes.

关键词： Water Quality Chlorophyll a Turbidity MODIS Remote Sensing