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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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Heuristic Estimation of the Vacuum Energy Density of the Universe: Part II-Analysis Based on Frequency Domain Electromagnetic Radiation

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Journal of Electromagnetic Analysis and Applications 2024年第1期16卷 1-9页

作者： Vernon Cooray Gerald Cooray marcos Rubinstein Farhad Rachidi Department of Electrical Engineering Uppsala University Uppsala Sweden Karolinska Institute Stockholm Sweden HEIG-VD University of Applied Sciences and Arts Western Switzerland Yverdon-les-Bains Switzerland Electromagnetic Compatibility Laboratory Swiss Federal Institute of Technology (EPFL) Lausanne Switzerland

In Part I of this paper, an inequality satisfied by the vacuum energy density of the universe was derived using an indirect and heuristic procedure. The derivation is based on a proposed thought experiment, according to which an electron is accelerated to a constant and relativistic speed at a distance L from a perfectly conducting plane. The charge of the electron was represented by a spherical charge distribution located within the Compton wavelength of the electron. Subsequently, the electron is incident on the perfect conductor giving rise to transition radiation. The energy associated with the transition radiation depends on the parameter L. It was shown that an inequality satisfied by the vacuum energy density will emerge when the length L is pushed to cosmological dimensions and the product of the radiated energy, and the time duration of emission is constrained by Heisenberg’s uncertainty principle. In this paper, a similar analysis is conducted with a chain of electrons oscillating sinusoidally and located above a conducting plane. In the thought experiment presented in this paper, the behavior of the energy radiated by the chain of oscillating electrons is studied in the frequency domain as a function of the length L of the chain. It is shown that when the length L is pushed to cosmological dimensions and the energy radiated within a single burst of duration of half a period of oscillation is constrained by the fact that electromagnetic energy consists of photons, an inequality satisfied by the vacuum energy density emerges as a result. The derived inequality is given by where is the vacuum energy density. This result is consistent with the measured value of the vacuum energy density, which is 5.38 × 10-10 J/m. The result obtained here is in better agreement with experimental data than the one obtained in Part I of this paper with time domain radiation.

关键词： Classical Electrodynamics Electromagnetic Radiation Action Radiated Energy Photon Heisenberg’s Uncertainty Principle Dark Energy Vacuum Energy Cosmological Constant Hubble Radius

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A Sustained Force for Economic Growth

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China Today 2024年第5期73卷 42-44页

作者： JAVIER garcia Spanish news agency Agencia EFE's Beijing office

A green industry chain has been formed in China,in which the latest technologies can be applied and further *** 2018,due to a job change,I came to China and became the head of the Spanish news agency Agencia EFE’s Beijing *** the end of 2021,I made a brave move from media to college,and started my new career as a teacher at the School of Journalism and Communication at Renmin University of China,which enabled me to get closer to China and the young Chinese.

关键词： closer Spanish college

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Characterization of Arroyo Verde Epithermal Deposit:Paragenesis,Mineral Geochemistry,Geochronology and Fluid Inclusions in Lower Chon Aike Volcanism,Argentina

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Journal of Earth Science 2024年第1期35卷 62-84页

作者： Cecilia Pavón Pivetta Leonardo Benedini Paulo marcos Ma.Agustina Cócola Mercedes Virginia Barros Daniel Gregori Leonardo Strazzere Anderson Costa dos Santos Mauro C.Geraldes Instituto Geologico del Sur(INGEOSUR) Universidad Nacional del Sur(UNS)-Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)Bahia Blanca 8000Argentina Dpto.de Geologia Universidad Nacional del Sur(UNS)Bahia Blanca 8000Argentina Universidad Nacional de Rio Negro Instituto de Investigacion en Paleobiologia y GeologiaGeneral Roca 8332Argentina Universidade do Estado do Rio de Janeiro Faculdade de GeologiaDepartamento de Mineralogia e Petrologia igneaRiodeJaneiro20559-900Brazil Geobiotec Departamento de GeocienciasUniversidade de AveiroAveiro 3800-002Portuga

Arroyo Verde epithermal deposit,in the North Patagonia region of Argentina,is located within the Lower Chon Aike volcanism and is developed between 192.6±2.5 Ma(mineralization host rock)and 189.5±2.6 Ma(overlying lava).Marifil volcanic complex is the host rock for these veins,veinlets and *** particular small deposit has developed low to intermediate sulphidation characteristics,with gangue mineral textures associated with several ore *** probe microanalysis determines electrum,silver minerals such as acanthite,and tetrahedrite,related Ag-Cu minerals like jalpaite,mckinstryite,stromeyerite,and base metals like chalcopyrite,sphalerite,galena and *** inclusions in quartz of two out of five events indicate that these Low Jurassic veins were formed due to subtle boiling and dilution mechanisms and by low-salinity(3.4 wt.%to 6.7 wt.%NaCl Eq)magmatic-hydrothermal fluid at 225 to 310℃.The fluid inclusion measurements that indicate boiling(Event 3)were plotted,and based on this data,we interpret that the Arroyo Verde deposit has been eroded between 550 and 700 *** particular character has not been previously recorded for other sectors of the eastern north Patagonian region.

关键词： epithermal deposit Ag minerals mineral geochemistry fluid inclusions Chon Aike geochronology

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Characteristics and trends of pediatric firepit burns: insights for prevention and safety

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World Journal of Pediatric Surgery 2024年第1期7卷 54-58页

作者： Maria Fazal Charbel Chidiac Raheel Ahmad Oussama Issa Erica Hodgman Alejandro V garcia Johns Hopkins School of Medicine BaltimoreMarylandUSA Department of Surgery Division of Pediatric SurgeryJohns Hopkins School of MedicineBaltimoreMarylandUSA Division of the Biological Sciences University of ChicagoChicagoIllinoisUSA School of Medicine American University of BeirutBeirutLebanon

Introduction As fire pits grow in popularity,so do the associated burn *** study examines pediatric fire pit burns characteristics to raise awareness and promote safety *** We conducted a retrospective review of pediatric patients(<21 years)with firepit burns at a tertiary care hospital from 2016 to *** Eighty-four patients were identified,of whom 70.2%were male,with a median age of 62 *** median percent total body surface area burned was 2%(interquartile range(IQR)=1-4).Thirty-five(41.7%)patients were admitted and 7(8.3%)underwent *** and trunk burns had the highest grafting rates(66%and 33%,respectively).The hands(41.7%)and the lower extremities(27.4%)were the most frequently burned body *** leading causes of burns were ashes/hot coals(34.5%),flames(31.0%),and direct contact(25.0%),often resulting from falling into the fire(59.5%)or running or playing in activities near it(26.2%).Thirty-five(41.7%)were admitted for inpatient management,while 49(58.3%)were treated as ***(13.2%)underwent at least one reconstructive surgery,7(8.4%)had at least one rehabilitation visit,and 65(77.4%)had follow-up clinic *** median length of stay was 2 days(IQR=1.0-3.5).The peak months for burns were from August through October(n=40,46.0%),with an increase observed from 10 cases in 2016to 20 cases in *** Given the significant proportion of firepit burns resulting from unsafe fire behaviors,it is crucial that caretakers are aware of proper firepit safety *** ofevidence Il.

关键词： burns admitted prevention

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Etching-free pixel definition in InGaN green micro-LEDs

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Light(Science & Applications) 2024年第8期13卷 1655-1665页

作者： Zhiyuan Liu Yi Lu Haicheng Cao Glen Isaac Maciel garcia Tingang Liu Xiao Tang Na Xiao Raul Aguileta Vazquez Mingtao Nong Xiaohang Li Advanced Semiconductor Laboratory Electrical and Computer Engineering ProgramCEMSE DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia

The traditional plasma etching process for defining micro-LED pixels could lead to significant sidewall *** near sidewall regions act as non-radiative recombination centers and paths for current leakage,significantly deteriorating device *** this study,we demonstrated a novel selective thermal oxidation(STO)method that allowed pixel definition without undergoing plasma damage and subsequent dielectric *** annealing in ambient air oxidized and reshaped the LED structure,such as p-layers and InGaN/GaN multiple quantum ***,the pixel areas beneath the pre-deposited SiO_(2)layer were selectively and effectively *** was demonstrated that prolonged thermal annealing time enhanced the insulating properties of the oxide,significantly reducing LED leakage ***,applying a thicker SiO_(2)protective layer minimized device resistance and boosted device efficiency *** the STO method,InGaN green micro-LED arrays with 50-,30-,and 10-μm pixel sizes were manufactured and *** results indicated that after 4 h of air annealing and with a 3.5-μm SiO_(2)protective layer,the 10-μm pixel array exhibited leakage currents density 1.2×10^(-6)A/cm^(2)at-10 V voltage and a peak on-wafer external quantum efficiency of~6.48%.This work suggests that the STO method could become an effective approach for future micro-LED manufacturing to mitigate adverse LED efficiency size effects due to the plasma etching and improve device ***-LEDs fabricated through the STO method can be applied to micro-displays,visible light communication,and optical interconnect-based *** planar pixel geometry will provide more possibilities for the monolithic integration of driving circuits with ***,the STO method is not limited to micro-LED fabrication and can be extended to design other III-nitride devices,such as photodetectors,laser diodes,high-electron-mobility transistors

关键词： annealing protective quantum

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Pathogenic strategies of Pseudogymnoascus destructans during torpor and arousal of hibernating

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四川生理科学杂志 2024年第7期46卷 1641-1641页

作者： marcos Isidoro-Ayza Department of Pediatrics Medicine and Medical Microbiology and Immunology School of Medicine and Public Health University of Wisconsin–Madison Madison WI 53706 USA.

Millions of hibernating bats across North America have died from white-nose syndrome(WNS),an emerging disease caused by a psychrophilic(cold-loving)fungus,Pseudogymnoascus destructans,that invades their *** of *** invasion of bat epidermis remain *** by our in vivo observations,we modeled hibernation with a newly generated little brown bat(Myotis lucifugus)keratinocyte cell line.

关键词： invasion nat fungus

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Effect of Senescence Retardants on the Quality of Persian Lime Fruits

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PHYTON-INTERNATIONAL JOURNAL OF EXPERIMENTAL BOTANY 2024年第8期93卷 1805-1818页

作者： Ariza-Flores, Rafael Ambriz-Cervantes, Rafael Cadena-Iniguez, Pedro Galvez-Marroquin, Luis A. Cano-garcia, Miguel A. Natl Inst Forestry Agr & Livestock Res INIFAP South Pacific Reg Ctr Villa de Etla Oaxaca 68200 Mexico Natl Inst Forestry Agr & Livestock Res INIFAP Zacatepec Res Stn Zacatepec 62780 Morelos Mexico Natl Inst Forestry Agr & Livestock Res INIFAP Cent Chiapas Res Stn Ocozocoautla 29140 Mexico Natl Inst Forestry Agr & Livestock Res INIFAP Oaxaca Cent Valley Res Stn Oaxaca 68200 Mexico

The objective of this study consisted of evaluating the effect of the application of chitosan (Q), 1-methylcyclopropene (1-MCP) under two controlled temperatures on some physical, physiological, and chemical parameters contributing to the quality of Persian lime Citrus latifolia fruits. Eight treatments were evaluated, resulting from the combination of four senescence retardant applications (Q, 1-MCP, 1-MCP + Q, and without application) on fruits stored at two temperatures (12/20 degrees C). Epidermis color (luminosity, chromaticity, and hue), fruit appearance, respiration, weight loss, total juice content, total soluble solids, and titratable acidity were registered during the study. The results indicate that the 1-MCP and Q combination favored fruit postharvest quality conditions such as reducing respiration rate; maintaining fruit good appearance, turgidity, and brighter fruit chromaticity; fruits treated with chitosan and stored at 12 degrees C, favored total soluble solids. On the other hand, Variables such as weight loss, juice content, acidity, phenols, flavonoids, antioxidant activity, and hue values were favored by a 12 degrees C storing temperature regardless of the treatment. In general, the use of modified atmospheres, senescence retardants, and refrigeration as postharvest methods, can increase Persian lime shelf life.

关键词： Citrus latifolia quality conservation organic alternatives SYSTEM

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Localized-states quantum confinement induced by roughness in CdMnTe/CdTe heterostructures grown on Si(111) substrates

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Journal of Semiconductors 2024年第9期45卷 28-35页

作者： Leonarde N.Rodrigues Wesley F.Inoch marcos L.F.Gomes Odilon D.D.Couto Jr. Bráulio S.Archanjo Sukarno O.Ferreira Physics Department Federal University of ViçosaViçosa36570-900Minas GeraisBrazil Instituto de Física Gleb Wataghin Universidade Estadual de CampinasCampinas13083-859São PauloBrazil National Institute of Metrology Quality and Technology(Inmetro) Materials Metrology Division(DIMAT)Xerém2525-020Rio de JaneiroBrazil

This work shows that despite a lattice mismatch of almost 20%, CdMnTe/CdTe/CdMnTe heterostructures grown directly on Si(111) have surprisingly good optical emission properties. The investigated structures were grown by molecular beam epitaxy and characterized by scanning transmission electron microscopy, macro-and micro-photoluminescence. Low temperature macro-photoluminescence experiments indicate three emission bands which depend on the CdTe layer thickness and have different confinement characteristics. Temperature measurements reveal that the lower energy emission band (at 1.48 eV)is associated to defects and bound exciton states, while the main emission at 1.61 eV has a weak 2D character and the higher energy one at 1.71 eV has a well-defined (zero-dimensional, 0D) 0D nature. Micro-photoluminescence measurements show the existence of sharp and strongly circularly polarized (up to 40%) emission lines which can be related to the presence of Mn in the heterostructure. This result opens the possibility of producing photon sources with the typical spin control of the diluted magnetic semiconductors using the low-cost silicon technology.

关键词： CdMnTe/CdTe/CdMnTe heterostructure CdTe/CdMnTe quantum emitters quantum dot-like emission silicon(111)substrate

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Isolated Third Nerve Cranial Palsy: Complication of Brain Aneurysm

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Surgical Science 2024年第4期15卷 225-231页

作者： Diana Magiricu Michelle garcia-Rybkin Internal Medicine Department Montefiore St. Luke&#8217s Cornwall Hospital Newburgh NY USA Emergency Medicine Department Montefiore St. Luke&#8217s Cornwall Hospital Newburgh NY USA

This case report highlights a critical and emergent condition, isolated third nerve cranial palsy due to a brain aneurysm. It emphasizes the importance of differential diagnosis and attentiveness to the physical exam in an emergency setting. The detailed progression from initial symptoms and misinterpretation to final diagnosis offers valuable insight into the dangers of overlooking critical diagnoses. A bilobed intracranial aneurysm arising from the internal carotid artery (ICA) caused symptoms in this patient that could have been attributed to a less malignant etiology, such as a complex migraine. Overlooking the urgency of the situation and missing the diagnosis could have had a grave and irreversible outcome.

关键词： Migraine Brain Aneurysm

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