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Optimal design of Hybrid Microgrid in Isolated Communities of Ecuador

Journal of Modern Power Systems and Clean energy 2024年第2期12卷 488-499页

作者： Luis A.Pesantes Ruben Hidalgo-León Johnny Rengifo Miguel Torres Jorge Aragundi JoséCordova-Garcia Luis F.Ugarte Facultad de ingeniería en Electricidad y Computación of escuela Superior Politécnica del Litoral(ESPOL)University GuayaquilEcuador department of Electrical engineering at Universidad Técnica Federico Santa María SantiagoChile IEEE

In rural territories, the communities use energy sources based on fossil fuels to supply themselves with electricity, which may address two main problems: greenhouse gas emissions and high fuel prices. Hence, there is an opportunity to include renewable resources in the energy mix. This paper develops an optimization model to determine the optimal sizing, the total annual investment cost in renewable generation, and other operating costs of the components of a hybrid microgrid. By running a k-means clustering algorithm on a meteorological dataset of the community under study, the hourly representative values become input parameters in the proposed optimization model. The method for the optimal design of hybrid microgrid is analyzed in six operating scenarios considering:(1) 24-hour continuous power supply;(2) load shedding percentage;(3) diesel power generator(genset) curtailment;(4) the worst meteorological conditions;(5) the use of renewable energy sources including battery energy storage systems(BESSs);and(6) the use of genset. A mathematical programming language(AMPL) tool is used to find solutions of the proposed optimization model. Results show that the total costs of microgrid in the scenarios that cover 100% of the load demand(without considering the scenario with 100% renewables) increase by over 16% compared with the scenario with genset operation limitation. For the designs with power supply restrictions, the total cost of microgrid in the scenario with load shedding is reduced by over 27% compared with that without load shedding.

关键词： Battery energy storage system(BESS) isolated community microgrid renewable energy optimization

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Exploring multifaceted factors in chronic kidney disease risk: A comprehensive analysis of biochemistry, lifestyle, and inflammation in elderly Chinese individuals

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World Journal of Clinical Cases 2024年第5期12卷 1033-1035页

作者： Fernando Cardona Unitat de Genètica Molecular Instituto de Biomedicina de Valencia–CSICValencia 46010Spain Centro de investigación Biomédica en Red enfermedades Neurodegenerativas(CIBERNED) Instituto de Salud Carlos IIIMadrid 28029Spain departamento de Biotecnología Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural(ETSIAMN)Univeristat Politècnica de ValenciaValencia 46022Spain

This letter praises a recent article in the World Journal of Clinical Cases(Roles of biochemistry data,lifestyle,and inflammation in identifying abnormal renal function in old Chinese),examining factors affecting abnormal renal function in elderly Chinese using advanced machine *** highlights the importance of uric acid,age,hemoglobin,body mass index,sport hours,and systolic blood *** study's holistic approach,integrating lifestyle and inflammation,offers a nuanced understanding of chronic kidney disease risk *** letter suggests exploring mechanistic pathways of hyperuricemia,the link between anemia and renal function,and the connection between body mass index and estimated glomerular filtration *** advocates investigating physical activity's impact on renal health and the independent effects of blood *** study significantly contributes to chronic kidney disease understanding,proposing avenues for further exploration and *** are extended to the authors and the journal.

关键词： Biochemistry data Lifestyle Machine learning Renal function

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Repellent and Insecticidal Activity of Naphthoquinones from the Heartwood of Tectona grandis on Incisitermes marginipennis(Latreille)

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Phyton-International Journal of Experimental Botany 2023年第7期92卷 2165-2181页

作者： Crisanto Velázquez-Becerra Gu Yen Ambriz-Ortiz Rafael Torres-Martínez Mauro Manuel Martínez-Pacheco Facultad de ingeniería en Tecnología de la Madera Universidad Michoacana de San Nicolás de HidalgoMoreliaMéxico escuela Nacional de Estudios Superiores Unidad MoreliaMoreliaMéxico Instituto de Investigaciones Químico-Biológicas Universidad Michoacana de San Nicolás de HidalgoMoreliaMéxico

Wood is a lignocellulosic material that,because of its organic nature,is a source of nutrients for bacteria,fungi,and *** marginipennis(Latreille)is an interesting dry wood-boring *** it is an extremely destructive pest,difficult to control due to its cryptic lifestyle,and for its role in the biogeochemical cycle of carbon and other elements;it is a fundamental *** use of less toxic and eco-friendly substances is important for protecting domestic,cultural,and historical heritage made of wood or lignocellulosic *** aim of this study was to evaluate the biological activity of various naphthoquinones extracted from the heartwood of *** on ***,heartwood flour was used for Soxhlet-type extractions to isolate and characterize the heartwood compounds by thin-layer *** identify the heartwood compounds,nuclear magnetic resonance and gas chromatography coupled to a mass spectrometer were *** information obtained was supported using the Interactive Spectroscopy *** identified heartwood compounds were lapachol,tectoquinone,deoxylapachol,dehydro-α-lapachone,tectol and *** nymphal termites of *** as a biological model,the isolated and identified molecules were under three different tests(repellent,insecticide and protective)and their biological activity was individually *** results showed that the molecules obtained have a repellent-protective effect against ***,although not in all cases,these molecules have high percentages of mortality and decreased the weight loss of the treated material exposed to ***.

关键词： Naphthoquinones dry wood termite Incisitermes marginipennis wood preservatives

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Palm oil biodiesel:An assessment of PAH emissions,oxidative potential and ecotoxicity of particulate matter

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Journal of environmental Sciences 2021年第3期33卷 326-338页

作者： Silvana Arias Francisco Molina John R.Agudelo Grupo de Investigación en Gestión y Modelación Ambiental-GAIA Escuela AmbientalFacultad de IngenieríaUniversidad de Antioquia UdeACalle 70 No.52-21MedellínColombia departamento de ingeniería Mecánica Universidad de Antioquia UdeA

This work assessed the impact of fuelling an automotive engine with palm biodiesel(pure,and two blends of 10%and 20%with diesel,B100,B10 and B20,respectively)operating under representative urban driving conditions on 17 priority polycyclic aromatic hydrocarbon(PAH)compounds,oxidative potential of ascorbic acid(OP^(AA)),and ecotoxicity through D aphnia pulex mortality *** diluted with filtered fresh air(WD)gathered in a minitunel,and particulate matter(PM)collected directly from the exhaust gas stream(W/oD)were used for *** showed that PM collecting method significantly impact PAH *** all PAH appeared in both,WD and W/oD,higher concentrations were obtained in the last *** biodiesel concentration in the fuel blend decreased all PAH compounds,and those with 3 and 5 aromatic rings were the most *** biodiesel affected both OP^(AA)and *** B10 and B20 exhibited the same rate of ascorbic acid(AA)depletion,B100 showed significant faster oxidation rate during the first four minutes and oxidized 10%more AA at the end of the test.B100 and B20 were significantly more ecotoxic than *** lethal concentration LC50 for B10 was 6.13 mg/*** was concluded that palm biodiesel decreased PAH compounds,but increased the oxidative potential and ecotoxicity.

关键词： Biodiesel Particulate matter P emissions Oxidative stress Ecotoxicity Daphnia pulex

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Indigestible fraction of guava fruit:Phenolic profile,colonic fermentation and effect on HT-29 cells

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Food Bioscience 2022年第2期46卷 563-571页

作者： Francisco J.Blancas-Benitez Jara P´erez-Jim´enez JAdriana Sa˜nudo-Barajas Nuria E.Rocha-Guzm´an Gustavo A.Gonz´alez-Aguilar Juscelino Tovar Sonia G.S´ayago-Ayerdi Tecnol´ogico Nacional de M´exico/Instituto Tecnol´ogico de Tepic Laboratorio Integral de Investigaci´on en AlimentosAv.Tecnol´ogico 2595CP 63175TepicNayaritMexico Institute of Food Science Technology and Nutrition(ICTAN-CSIC)Jos´e Antonio Novais 1028040MadridSpain Centro de Investigaci´on en Alimentaci´on y desarrollo A.C.Unidad Culiac´an.ApdoPostal 32-A.80129Culiac´anSinaloaMexico Tecnol´ogico Nacional de M´exico/Instituto Tecnol´ogico de Durango Departamento de Ingenierías Química y Bioquímica BlvdFelipe Pescador 1830Ote.Col.Nueva VizcayaCP 3408078000DurangoDgo.Mexico Coordinaci´on de Tecnología de alimentos de Origen Vegetal Lab.de Antioxidantes y Alimentos FuncionalesCentro de Investigaci´on en Alimentaci´on y DesarrolloA.C.Carretera a la Victoria Km 0.6Col.La VictoriaHermosillo Sonora83000Mexico department of Food Technology Engineering and NutritionLund UniversityP.O.Box 124SE-22100LundSweden

Guava fruit is rich in phenolic compounds(PCs),whose metabolic fate has not been ***-digestible carbohydrates and PCs in whole guava(WG)and seedless guava(SG)were submitted to an in vitro colonic fermentation,followed by evaluation of the anti-proliferative activity of the fermentation extracts in HT-29 cancer cell *** main PCs in both samples were(+)-gallocatechin and gallic acid,while procyanidin B was the most abundant one associated with soluble indigestible fraction and quercetin predominated in the insoluble indigestible *** fermentability index at 24 h was 78.84%in WG and 84.74%for SG,near to the value for raffinose used as reference,with butyric acid as the main short chain fatty acids(SCFA)*** greatest antiproliferative effects were observed in the SG at 12 h of fermentation and WG at 24 h of *** results allow to suggest consumption of guava fruit,either with or without seeds,as a feasible way to maintain colonic health.

关键词： Short chain fatty acids(SCFA) Phenolic compounds Indigestible fraction In vitro colonic fermentation Antiproliferative Psidium guajava L

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Pisco grape pomace:Iron/copper speciation and antioxidant properties,towards their comprehensive utilization

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Food Bioscience 2022年第3期47卷 1213-1221页

作者： Fátima Rodríguez-Ramos Raúl Cañas-Sarazúa Vilbett Briones-Labarca departamento de ingeniería en alimentos Universidad de La SerenaAv.Raúl Bitrán Nachary 1305Box 5991720010La SerenaChile

The pisco and wine industry produces hundreds of tons of grape pomace each year in Chile,generating environmental problems,and demanding urgent strategies for its *** aim of this work was to study the pisco grape pomace based on a physicochemical characterization,an iron/copper speciation analysis,and the optimization for polyphenols recovery,establishing the polyphenolic profile,antioxidant properties,and the Fe^(2+)/Cu^(2+) chelating activity,to promote their revalorization as an ingredient with potential application in the food *** chemical characterization showed mainly high values for crude protein(15.36%dw)and potassium(9240.66 mg/kg).The Fe/Cu speciation depicted that iron and copper soluble forms in pisco pomace flour represented 70.57%and 52.18%,respectively,regarding total *** optimized extract showed mainly pyrogallol,catechin and epicatechin,with concentrations of 1078.43±60.14μg/g,883.20±7.57μg/g and,751.76±23.04μg/g,respectively,with a relevant antioxidant capacity by Oxygen Radical Absorbance Capacity(ORAC)of 1402.15μmol TE/g dw GPE and,a better chelating ability to complex Fe^(2+) than Cu^(2+).The pisco pomace was for the first time chemically characterize,showing it as a potential source of minerals and antioxidant biocompounds,making it a good candidate for nutritional applications,as a rich source of organic matter or even could be potentially utilized to produce value-added commodities,toward a circular economy.

关键词： Pisco grape pomace Polyphenols Chemical speciation analysis Antioxidant capacity Metal chelating ability

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Mixed-conducting ceramic–carbonate membranes exhibiting high CO2/O2 permeation flux and stability at high temperatures

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Journal of Advanced Ceramics 2020年第1期9卷 94-106页

作者： R.ORTEGA-LUGO J.A.FABIAN-ANGUIANO O.OVALLE-enCINIA C.GOMEZ-YANEZ B.H.ZEIFERT J.ORTIZ-LANdeROS Instituto Politécnico Nacional Escuela Superior de Ingeniería Química e Industrias ExtractivasDepartamento de Ingeniería en Metalurgia y MaterialesUPALM-ZacatencoMexico City 07738Mexico Chemical engineering School for engineering of Matter Transport and EnergyArizona State UniversityTempeAZ 85287-6106USA

This investigation demonstrates the feasibility to fabricate high quality ceramic–carbonate membranes based on mixed-conducting ***,it is reported the simultaneous CO2/O2 permeation and stability properties of membranes constituted by a combination of ceramic and carbonate phases,wherein the microstructure of the ceramic part is composed,in turn,of a mixture of fluorite and perovskite *** ceramics showed ionic and electronic conduction,and at the operation temperature,the carbonate phase of the membranes is in liquid state,which allows the transport of CO32-and O2–species via different *** fabricate the membranes,the ceramic powders were uniaxially pressed in a disk ***,an incipient sintering treatment was carried out in such a way that a highly porous ceramic was ***,the piece is densified by the infiltration of molten *** of the membranes was accomplished by SEM,XRD,and gas permeation techniques among *** and chemical stability under an atmosphere rich in CO2 was ***2/O2 permeation and long-term stability measurements were conducted between 850 and 940℃.The best permeation–separation performance of membranes of about 1 mm thickness,showed a maximum permeance flux of about 4.46×10^–7 mol·m^–2·s^–1·Pa^–1 for CO2 and 2.18×10^–7 mol·m^–2·s^–1·Pa^–1 for O2 at 940℃.Membranes exhibited separation factor values of 150–991 and 49–511 for CO2/N2 and O2/N2 respectively in the studied temperature *** long-term stability test showed certain microstructural changes in the membranes,no significant detriment on the permeation properties was observed along 100 h of continuous operation.

关键词： CO2 separation O2 separation ceramic–carbonate membrane selectivity

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Hydrothermal synthesis of pyrrhotite(Fex-1S) nanoplates and their antibacterial, cytotoxic activity study

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Progress in Natural Science:Materials International 2018年第4期28卷 447-455页

作者： Liliana Argueta-Figueroa Nayely Torres-Gómez René García-Contreras A.R.Vilchis-Nestor O.Martínez-Alvarez L.S.Acosta-Torres M.C.Arenas-Arrocena Laboratorio de Investigación Interdisciplinaria área de Nanoestructuras y Biomateriales Escuela Nacional de Estudios Superiores Unidad León Universidad Nacional Autónoma de México Centro Conjunto de Investigación en Química Sustentable (CCIQS) UEAMex-UNAM departamento de ingeniería en energía Universidad Politécnica de Guanajuato

The aim of this study was to synthesize and characterize Fex-1S 2D-nanostructures with pyrrhotite phase,as well as to explore their biological(antibacterial and cytotoxic)properties,namely the expression of reactive oxygen species(ROS)in the exposure of cells and *** on hydrothermal synthesis,the characterization of asprepared 2D-nanostructures was performed by XRD,SEM,EDS,and TEM,in which the single-crystalline pyrrhotite phased Fex-1S nanoplate morphology was *** antibacterial activities of Fex-1S nanoplates against human pathogenic strains such as Staphylococcus aureus,Escherichia coli,and enterococcus faecalis were *** inhibitory concentration(MIC)and minimum bactericidal concentration(MBC)were determined following the broth microdilution *** and expression of intracellular ROS of pyrrhotite nanoplates on Human Gingival Fibroblast(HGF),Human Pulp Cells(HPC)and Human Osteoblast(HBC)were *** viability was determined by the MTT *** experiments were performed of three independent experiments and data were analyzed by Kruskal-Wallis and Mann-Whitney tests,also Pearson′s Correlation was *** nanoplates exhibited good bactericidal *** types of cells tested showed slight *** was found that intracellular ROS is produced when cells and bacteria tested are exposed to pyrrhotite nanoplates in presence of both air and peroxide *** production levels were higher in the bacteria than the cells exposed to these nanoplates.

关键词： Hydrothermal synthesis Iron sulfide nanoplates Minimal inhibitory concentration Antibacterial effect Cytotoxicity assay

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Microstructural evaluation and nanohardness of an AlCoCuCrFeniTi high-entropy alloy

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International Journal of Minerals,Metallurgy and Materials 2019年第5期26卷 634-641页

作者： C.D.Gómez-Esparza R.Peréz-Bustamante J.M.Alvarado-Orozco J.Mu?oz-Salda?a R.Martínez-Sánchez J.M.Olivares-Ramírez A.Duarte-Moller Centro de Investigación en Materiales Avanzados (CIMAV) Laboratorio Nacional de Nanotecnología CONACYT-Corporación Mexicana de Investigación en Materiales S.A.de C.V.(COMIMSA) Centro de ingeniería y desarrollo Industrial Querétaro Campus Centro de Investigación y de Estudios Avanzados del IPN Unidad Querétaro Universidad Tecnológica de San Juan del Río escuela de ingeniería Civil Industrialy Mecánica Universidad De La Salle Bajío

An AlCoCuCrFeniTi high-entropy alloy(HEA) was prepared by mechanical alloying and sintering to study the effect of Ti addition to the widely studied AlCoCuCrFeni system. The structural and microstructural characteristics were investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM), and transmission electron microscopy(TEM). The formation of four micrometric phases was detected: a Cu-rich phase with a face-centered cubic(fcc) structure, a body-centered cubic(bcc) solid solution with Cu-rich plate-like precipitates(fcc), an ordered bcc phase, and a tetragonal structure. The XRD patterns corroborate the presence of a mixture of bcc-, fcc-, and tetragonal-structured phases. The Vickers hardness of the alloy under study was more than twice that of the AlCoCuCrFeni alloy. Nanoindentation tests were performed to evaluate the mechanical response of the individual phases to elucidate the relationship between chemical composition, crystal structure, and mechanical performance of the multiphase microstructure of the AlCoCuCrFeniTi HEA.

关键词： high-entropy alloys mechanical alloying microstructure nanoindentation

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Effect of forest disturbance on myxomycete assemblages in the southwestern Peruvian Amazon

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Fungal Diversity 2013年第2期59卷 45-53页

作者： Carlos Rojas Steven L.Stephenson Instituto de Investigaciones en ingeniería and escuela de Biología Universidad de Costa RicaSan Pedro de Montes de Oca 11501-2060Costa Rica department of Biological Sciences University of ArkansasFayettevilleAR 72701-1201USA

Although the effects of microenvironmental factors on distribution patterns in myxomycetes have been investigated,studies of the responses of this group of organisms to different regimes of forest disturbance are relatively few in *** an effort to understand the implications of forest fragmentation and habitat loss on myxomycetes,the project described herein was carried out at the Los Amigos Biological Station in southeastern *** structure and composition of assemblages of myxomycetes were investigated in relation to three different forest types and climatic periods in the area of *** analysis of the most commonly recorded substrates was carried out as *** results suggested that habitat loss,through differences in forest structure,was the factor determining most of the differences in fruiting body abundance of myxomycetes among forest *** addition,a switch in the ecological strategy of dispersal seemed to be an important factor accounting for differences in the fruiting body abundance and structure of assemblages of myxomycetes between collecting *** study provides evidence indicating that for microbial assemblages to maintain the balance of functional interactions within a particular forest ecosystem,the conservation of the forests themselves should be considered.

关键词： Biogeography Microbial ecology Mycetozoans Myxogastrids Restoration ecology

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