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Optimal Design of Hybrid Microgrid in Isolated Communities of Ecuador

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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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Autoantibodies against beta cells to predict early insulin requirements in pediatric patients with clinically diagnosed type 2 diabetes

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World Journal of Diabetes 2024年第8期15卷 1717-1725页

作者： jorge M Molina Patricia G Medina Rita A Gomez Julia R Herrera Nancy L Martínez Brenda Hernández Yesenia García Department of Endocrinology Children’s Hospital Federico GomezMexico 06720Mexico National Medical Center"Siglo XXI" UMAE Hosp EspecialidadesUnidad Invest Med Epidemiol ClinMexican Social Security InstituteMexico 06720Mexico Research Division UMAE Hospital de EspecialidadesCentro Médico Nacional Siglo XXIMexican Institute of Social SecurityMexico 06720Mexico Epidemiology Research Unit in Endocrinology and Nutrition Federico Gómez Children’s HospitalMexico 06720Mexico Department of Endocrinology Comprehensive Health Unit for Trans PersonsMexico 11340Mexico

BACKGROUND Autoimmunity has emerged as a probable disease modifier in patients with clinically diagnosed type 2 diabetes mellitus(T2DM),that is,patients who have insulin resistance,obesity,and other cardiovascular risk factors,suggesting that the presence of glutamic acid decarboxylase(anti-GAD65),islet antigen 2(anti-IA2),and zinc transporter 8(anti-Zn8T)antibodies could have deleterious effects on beta cell function,causing failure and earlier requirement for insulin *** To evaluate anti-GAD65,anti-IA2 and anti-Zn8T as predictors of early insulin requirement in adolescents with a clinical diagnosis of *** This was a case–control study in patients with clinically diagnosed with T2DM(68 cases and 64 controls with and without early insulin dependence respectively),male and female,aged 12–18 ***,blood pressure,glucose,insulin,C-peptide,glycated hemoglobin A1c,and lipid profiles were *** was used to measure anti-GAD65,anti-IA2,and anti-Zn8T *** statistics,Pearson'sχ2 test,Student's t test,and logistic regression was performed.P<0.05 was considered statistically *** There were 132 patients(53.8%female),with a mean age was 15.9±1.3 years,and there was a disease evolution time of 4.49±0.88 *** presence of anti-GAD65,anti-IA2,and anti-Zn8T positivity was found in 29.5%,18.2%,and 15.9%,*** the groups by early or no insulin dependence showed that the group with insulin had a higher frequency of antibody positivity:anti-GAD65 odds ratio(OR):2.42(1.112–5.303,P=0.026);anti-IA2:OR:1.55(0.859–2.818,P=0.105);and anti-Zn8T:OR:7.32(2.039–26.279,P=0.002).CONCLUSION Anti-GAD65 positivity was high in our ***-GAD65 and anti-Zn8T positivity showed a significantly depleted beta cell reserve phenotype,leading to an increased risk of early insulin dependence.

关键词： Diabetes Obesity Adolescents Autoimmunity Beta cell Insulin requirements

Use of δ^(18)O, δ^(13)C and NO_(3)^(-) to identify hydrogeochemical processes related to contamination in an aquifer located in central Mexico

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Acta Geochimica 2022年第3期41卷 367-392页

作者： JoséIván Morales-Arredondo María Aurora Armienta Hernández Fátima Juárez-Aparicio jorge federico Landa-Arreguín Itzamna Zaknite Flores-Ocampo Natural Resources Department Institute of GeophysicsNational Autonomous University of MexicoCiudad Universitaria No.3000Col.Copilco UniversidadCoyoacan Delegation04360 MexicoCDMXMexico Earth Sciences Postgraduate Program University National Autonomous of MexicoUniversity City No.3000Col.Copilco UniversityCoyoacán Delegation04510 MexicoCDMXMexico

In this work,an isotopic analysis of δ^(18)O,δ^(13)C,and NO_(3)^(-) concentrations was carried out to identify the origin and the processes related to the contamination of an aquifer located in the state of Guanajuato,*** research identified the possible sources of δ^(13)C in *** groundwater flow,CO_(2) participates in different hydrogeochemical reactions in which the dissolution of carbonates or biochemical processes related to biodegradation stand *** data of δ^(13)C,δ^(18)O,and the hydrogeochemical behavior of NO_(3)^(-) and HCO_(3)^(-) in water,in addition to isotopic data and the chemical composition of limestones in the study area,were determined to establish the isotopic signature and the processes undergone by the *** isotopic signature of rock and water samples indicated that metamorphic limestones contributed with carbon dioxide to deep groundwater,while in the upper aquifer,bacterial metabolic reactions during nitrification–denitrification could modify the isotopic signature of δ^(13)C in some wells,although atmospheric contribution also plays a *** modification of the carbon isotopic component is related to the precipitation of calcite in specific regions of the study area,input of atmospheric CO_(2),and soil(*** possible participation of C4-type plants in the assimilation-release of carbon).This process is not confirmed or completely ruled out in this study since agriculture is excessively developed throughout the *** joint interpretation of isotopic values and the hydrogeochemical behavior of major and conservative elements help in identifying possible pollution processes in which different carbon sources are related.

关键词： ^(18)O and^(13)C isotopes Groundwater pollution Nitrate Limestone

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Scalable and low-cost fabrication of flexible WS_(2) photodetectors on polycarbonate

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npj Flexible Electronics 2022年第1期6卷 226-234页

作者： jorge Quereda Sruthi Kuriakose Carmen Munuera federico J.Mompean Abdullah M.Al-Enizi Ayman Nafady Enrique Diez Riccardo Frisenda Andres Castellanos-Gomez GISC Departamento de Física de MaterialesUniversidad Complutense de MadridMadridSpain Materials Science Factory Instituto de Ciencia de Materiales de Madrid(ICMMCSIC)28049 MadridSpain Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Nanotechnology Group USAL–NanolabUniversidad de Salamanca37008 SalamancaSpain

We present a low-cost and easy-to-implement technique to fabricate large-area WS_(2) photodetector devices onto transparent and flexible polycarbonate *** method relies on the deposition of large-area(in the cm scale)thin films(~30 nm thick)of WS_(2) by a recently introduced abrasion-induced *** electrical contacts are then deposited by thermal evaporation through a shadow *** photodetectors present well-balanced performances with an good trade-off between responsivity(up to 144 mA/W at a source-drain voltage of 10 V and illumination power of 1μW)and response time(down to~70µs)and a detectivity value of 10^(8) *** found that the devices perform very reversibly upon several illumination and straining cycles and we found a moderate device-to-device variation.

关键词： drain illumination cost

A study of chlorophyll-like and phycobilin pigments in the C endosymbiont of the apple- snail Pomacea canaliculata

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BIOCELL 2012年第2期36卷 47-55页

作者： ISRAEL A.VEGA federico A.DELLAGNOLA jorge A.HURST MARTÍN S.GODOY ALFREDO CASTRO-VAZQUEZ Laboratorio de Fisiologia(IHEM-CONICET) and Departamento de Morfología y Fisiología(Facultad de Ciencias MédicasUniversidad Nacional de Cuyo)Casilla de Correo 335500 MendozaArgentina Instituto de Ciencias Básicas-Universidad Nacional de Cuyo.Padre jorge Contreras 1300.Parque Gral.San Martín 5500 Mendoza Departamento de Química Biológica.Facultad de Farmacia y Bioquímica Universidad de Buenos Aires.Present address:Instituto de Botánica Darwinion.Labardén 200B1642HYD Buenos Aires

Pigments present in the brown-greenish C morph of an intracellular endosymbiont of Pomacea canaliculata were *** extracts of the endosymbiotic corpuscles showed an absorption spectrum similar to that of *** fractions obtained from silica gel column chromatography of the acetone extracts(CI,CII and CIII),were studied by positive ion fast atom bombardment-mass spectrometry(FAB–MS)and hydrogen-nuclear magnetic resonance(H-NMR).Results indicated the presence of(1)a sterol in the yellow colored CI fraction;(2)a mixture of pheophorbides a and b in the major green fraction,CII;and(3)a modified pheophorbide a in the smaller green fraction,*** extracts of the C endosymbiont did not show evidence of the occurrence of C-phycocyanin,allophycocyanin or phycoerithrin(light absorption,fluorescence emission,and electrophoresis of the protein moieties)while cyanobacterial cells(Nostoc sp.)showed evidence of C-phycocyanin and *** possible phylogenetic and functional significance of the pigments present in the C endosymbiont is discussed.

关键词： symbiosis Cyanobacteria chloroplast photosynthetic pigments phylogeny

Mineralogical signatures and sources of recent sediment in a large tropical lake

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International Journal of Sediment Research 2018年第2期33卷 183-190页

作者： jorge Feliciano Ontiveros-Cuadras Ana Carolina Ruiz-Fernández Joan-Albert Sanchez-Cabeza Libia Hascibe Pérez-Bernal Michel Preda federico Páez-Osuna Polytechnic University of Sinaloa (UPSIN) Mazatlan Academic Unit Institute of Marine Sciences and LimnologyNational Autonomous University of Mexico (UNAM) Oceanic and Coastal Processes Academic Unit Institute of Marine Sciences and LimnologyNational Autonomous University of Mexico (UNAM).University City Department of Earth and Atmospheric Sciences University of Quebec in Montreal (UQAM)

Two lead-210(210Pb) dated sediment cores from Chapala Lake were studied to identify the mineral composition of the sediments and to discuss its relation with trace metals. Minerals and trace metals reflected the domain of volcanic rocks(i.e. basalts, rhyolite and andesite) that characterize Chapala Lake and the Lerma River watershed. Redundancy analyses(RDA) were used to identify the sedimentary variables(magnetic susceptibility, organic matter, sand content, and mineral composition) that could be related to elemental composition. Despite the distance between the two cores(7.3 km) and hydrodynamic circulation the RDA showed that the main mechanism that controls the input of mineral species,and, therefore, element distributions in the lacustrine sediment of Chapala Lake, is related to the weathering of volcanic rocks in the Lerma-Chapala watershed, the consequent runoff and transport of fine grained catchment materials, and later in-lake processes. These findings highlight the importance of controlling watershed erosion to contribute to the improvement of the environmental quality of the lake.

关键词： Chapala Lake Trace metals Mineralogy Lacustrine sediments

Computational solution of an acid-mediated tumor-growth radial model under logistic growth regimes for normal and cancer cells

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International Journal of Biomathematics 2023年第3期16卷 45-62页

作者： Farhan Khan Mudassar Abbas jorge E.Macias-Diaz Muhammad Bilal Khan Safar M.Alghamdi Department of Mathematics and Computer Sciences University of Palermo 90133 PalermoItaly Department of Mathematics and Applications “R.Caccioppoli”University of Naples Federico iiVia Cintia 80126NaplesItaly Department of Mathematics School of Digital Technologies Tallinn University10120 TallinnEstonia Departamento de Matematicas y Fisica Universidad Autonoma de Aguascalientes AguascalientesAgs.20131Merico Department of Mathematics COMSATS University Islamabad Islambad44000 Pakistan Department of Mathematics and Statistics College of Science Taif University Taif 21944Saudi Arabia

Tumor invasion follows a complex mechanism which involves cell migration and *** study the processes in which primary and secondary metastases invade and damage the normal cells,mathematical models are often extremely *** this paper,we present a mathematical model of acid-mediated tumor growth consisting of radially symmetric reaction-diffusion *** assumption on the radial symmetry of the solutions is imposed here in view that tumors present spherical symmetry at the microscopic ***,we consider various empirical mechanisms which describe the propagation of tumors by considering cancer cells,normal cells,and the concentration of H+*** other assumptions,we suppose that these components follow logistictype growth ***,this is an important difference with respect to various other mathematical models for tumor growth available in the ***,we also add competition terms of normal and tumor cells *** carry out a balancing study of the equations of the model,and a numerical model is proposed to produce *** practical remarks derived from our assumptions are provided in the discussion of our simulations.

关键词： Cancer growth model radially symmetric system acid-mediated tumor growth computer simulations

Diagnosis of Mycobacterium tuberculosis using molecular biology technology

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Asian Pacific Journal of Tropical Biomedicine 2011年第2期1卷 89-93页

作者： Juan Garberi jorge Labrador federico Garberi Juan Ezequiel Garberi Julian Peneipil Miguel Garberi Luis Scigliano Alcides Troncoso Laboratory of Molecular Biology and Pathology School of MedicineBuenos Aires University Orange Solutions School of MedicineBuenos Aires University Department of Infectious Diseases School of MedicineBuenos Aires University

Objective:To present an integrated molecular biology dedicated system for tuberculosis ***:One hundred and five sputum specimens from patients strongly suspected by clinical parameters of tuberculosis were studied by Ziehl-Neelsen staining,by cultivation on solid medium and by a balanced hemincsted fluorometric PCR system(Orange C3TB) that could preserve worker safety and produce a rather pure material free of potential inhibitors. DNA amplification was performed in a low cost tuberculosis *** double stranded DNA was flurometrically *** whole reaction was conducted in one single tube which would not be opened after adding the processed sample in order to minimize the risk of cross contamination with ***:The assay was able to delect 30 bacillus per sample mL with 99.8%interassay variation *** was positive in 23(21.9%) tested samples(21 of them were smear negative).In our study it showed a preliminary sensitivity of 94.5%for sputum and an overall specificity of 98.7%.Conclusions:Total run time of the test is 4 h with 2.5 real working *** PCR positive samples are also positive by microbiological culture and clinical *** show that it could be a very useful tool to increase detection efficiency of tuberculosis disease in low bacilus load ***,its low cost and friendly using make it feasible to run in poor regions.

关键词： Tuberculosis Sputum Molecular diagnosis Low cost Real-time PCR Mycobacterium tuberculosis Molecular biology technology Sputum sample Microbiological culture

Towards an integrative approach to evaluate the environmental ecosystem services provided by urban forest

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Journal of Forestry Research 2019年第6期30卷 1981-1996页

作者： Samson Roeland Marco Moretti jorge Humberto Amorim Cristina Branquinho Silvano Fares federico Morelli Ulo Niinemets Elena Paoletti Pedro Pinho Gregorio Sgrigna Vladimir Stojanovski Abhishek Tiwary Pierre Sicard Carlo Calfapietra Department of Bioscience Engineering Research Group Environmental Ecology and Applied MicrobiologyLaboratory of Environmental and Urban EcologyUniversity of AntwerpAntwerpBelgium Institute of Research on Terrestrial Ecosystems(IRET) CNRHeadquartersVia Marconi 2PoranoItaly Forest Faculty in Skopje University SS Cyril and Methodius1000 SkopjeMacedonia Faculty of Engineering and the Environment University of SouthamptonHighfieldSouthampton SO17 1BJUK ARGANS 260 Route du Pin Montard06904 Sophia AntipolisFrance Department of Landscape Design and Sustainable Ecosystems Agrarian-technological InstituteRUDN UniversityMiklukho-Maklaya Str.6MoscowRussia 117198 Swiss Federal Research Institute WSL Biodiversity and Conservation BiologyZu¨rcherstrasse 1118903 BirmensdorfSwitzerland Swedish Meteorological and Hydrological Institute(SMHI) SE-60176 Norrko¨pingSweden Faculdade de Cieecias cE3c-Centre for EcologyEvolution and Environmental ChangesUniversidade de LisboaCampo GrandeLisbon 1749-016Portugal Council for Agricultural Research and Economics(CREA) Research Center for Forestry and WoodArezzoItaly Department of Applied Geoinformatics and Spatial Planning Faculty of Environmental SciencesCzech University of Life Sciences PragueKamy′cka′129165 00 Prague 6Czech Republic Institute of Agricultural and Environmental Sciences Estonian University of Life SciencesKreutzwaldi 1Tartu 51014Estonia Institute of Research on Terrestrial Ecosystems(IRET) CNRSection of FlorenceVia Madonna del Piano 10Sesto FiorentinoItaly Centre for Natural Resources and the Environment Instituto Superior Te′cnicoUniversity of LisbonLisbon 1749-016Portugal

As a Nature-Based Solution,urban forests deliver a number of environmental ecosystem services(EESs).To quantify these EESs,well-defined,reliable,quantifiable and stable indicators are *** literature analysis and expert knowledge gathered within COST Action FP1204 GreenInUrbs,we proposed a classification of urban forest EESs into three categories:(A)regulation of air,water,soil and climate;(B)provisioning of habitat quality;and(C)provisioning of other goods and *** category is divided into EES types:(a)amelioration of air quality;restoration of soil and water;amelioration of the microclimate;removal of CO2 from the air;(b)provision of habitat for biodiversity;support for resilient urban ecosystems;provision of genetic diversity;and(c)provision of energy and nutrients;provision of grey infrastructure *** EES type provides one or more *** each of these 12 benefits,we propose a set of indicators to be used when analyzing the impacts on the identified *** half of the 36 indicators are relevant to more than one single benefit,which highlights complex *** indicators of wider applicability are tree and stand characteristics,followed by leaf physical traits and tree species *** knowledge is needed for the optimization of the EESs delivered by urban forests,now and in the future.

关键词： Urban forests Environmental ecosystem services Indicators

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