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Tracking the maximum power point of solar panels through direct estimation of optimum voltage with temperature

Clean Energy 2024年第4期8卷 135-146页

作者： Mohammed El Bachir Ghribi luis garcia-gutierrez Zine Eddine Touhami Ternifi Zhixue Zheng Ghalem Bachir Michel Aillerie Applied Power Electronics Laboratory(LEPA) University of Science and Technology of Oran Mohamed BoudiafOranAlgeria Laboratoire Matériaux Optiques Photonique et Systèmes(LMOPS)Universitéde LorraineCentraleSupélecF-57000 MetzFrance Laboratory of Sustainable Development of the Electrical Energy(LDDEE) University of Science and Technology of Oran Mohamed BoudiafOranAlgeria

Electricity production from photovoltaic(PV)panels is maximized when the operating point is located at the maximum power point thanks to dedicated *** controllers are driven to track the maximum power by using various algorithms within distributed or centralized architectures accounting for factors such as partial irradiation and temperature *** effect of irradiance on the optimal panel voltage is weak or even negligible,while it is strong and quasi-linear-dependent on *** on this observation,this article introduces a straightforward method for tracking the maximum power of a PV panel by using an optimizer,focusing solely on its temperature response as an input *** proposed approach hinges on linearizing the relationship between panel temperature and operating *** relationship enables the estimation of the maximum power point through temperature measurement ***,after determination of the linear temperature coefficient of the voltage requiring only the knowledge of two optimal voltages at different temperatures,for example from the datasheet of the panel,the power tracking involves only one temperature sensor placed on the panel alongside a voltage sensor for *** principle,modelling,and validation post-panel ageing of the method are detailed in this ***,conducted using real experimental irradiation and temperature data,attests to the effectiveness of the *** indicate an average effectiveness of the method of>99.1%in tracking the maximum power,with the panel generating 2.33 kWh out of a possible 2.35 *** performance is comparable to that of tracking devices employing more complex *** simplicity and efficiency of the method make it a promising option for maximizing the power production at low cost from PV systems in small or residential,on-or off-grid connected applications.

关键词： photovoltaic maximum power point tracking hysteresis efficiency

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Segment Anything for Comprehensive Analysis of Grapevine Cluster Architecture and Berry Properties

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Plant Phenomics 2024年第3期6卷 696-707页

作者： Efrain Torres-Lomas Jimena Lado-Bega Guillermo garcia-Zamora luis Diaz-garcia Department of Viticulture and Enology University of California DavisDavisCA 95616USA Soil and Water Department Universidad de la RepublicaMontevideo 11400Uruguay

Grape cluster architecture and compactness are complex traits influencing disease susceptibility,fruit quality,and *** methods for these traits include visual scoring,manual methodologies,and computer vision,with the latter being the most scalable *** of the existing computer vision approaches for processing cluster images often rely on conventional segmentation or machine learning with extensive training and limited *** Segment Anything Model(SAM),a novel foundation model trained on a massive image dataset,enables automated object segmentation without additional *** study demonstrates out-of-the-box SAM's high accuracy in identifying individual berries in 2-dimensional(2D)cluster *** this model,we managed to segment approximately 3,500 cluster images,generating over 150,000 berry masks,each linked with spatial coordinates within their *** correlation between human-identified berries and SAM predictions was very strong(Pearson's r^(2)=0.96).Although the visible berry count in images typically underestimates the actual cluster berry count due to visibility issues,we demonstrated that this discrepancy could be adjusted using a linear regression model(adjusted R^(2)=0.87).We emphasized the critical importance of the angle at which the cluster is imaged,noting its substantial effect on berry counts and *** proposed different approaches in which berry location information facilitated the calculation of complex features related to cluster architecture and ***,we discussed SAM's potential integration into currently available pipelines for image generation and processing in vineyard conditions.

关键词： architecture analysis cluster anything berry comprehensive grapevine properties segment

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Acoustic emission characterization of microcracking in laboratory-scale hydraulic fracturing tests

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 805-817页

作者： Jesse Hampton Marte gutierrez luis Matzar Dandan Hu Luke Frash Department of Civil & Environmental Engineering Colorado School of Mines Golden CO 80401 USA New England Research Inc. White River Junction VT 03766 USA Halliburton Houston TX 77032 USA Los Alamos National Laboratory Los Alamos NM 87545 USA

Understanding microcracking near coalesced fracture generation is critically important for hydrocarbon and geothermal reservoir characterization as well as damage evaluation in civil engineering structures. Dense and sometimes random microcracking near coalesced fracture formation alters the mechanical properties of the nearby virgin material. Individual microcrack characterization is also significant in quantifying the material changes near the fracture faces （i.e. damage）. Acoustic emission （AE） monitoring and analysis provide unique information regarding the microcracking process temporally, and infor- mation concerning the source characterization of individual microcracks can be extracted. In this context, laboratory hydraulic fracture tests were carried out while monitoring the AEs from several piezoelectric transducers. In-depth post-processing of the AE event data was performed for the purpose of under- standing the individual source mechanisms. Several source characterization techniques including moment tensor inversion, event parametric analysis, and volumetric deformation analysis were adopted. Post-test fracture characterization through coring, slicing and micro-computed tomographic imaging was performed to determine the coalesced fracture location and structure. Distinct differences in fracture characteristics were found spatially in relation to the openhole injection interval. Individual microcrack AE analysis showed substantial energy reduction emanating spatially from the injection interval. It was quantitatively observed that the recorded AE signals provided sufficient information to generalize the damage radiating spatially away from the injection wellbore.

关键词： Acoustic emission (AE) Microcracking Hydraulic fracturing Laboratory-scale testing Moment tensor analysis Fracture coalescence Computed tomography (CT) imaging

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Data model extension for security event notification with dynamic risk assessment purpose

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Science China(Information Sciences) 2013年第11期56卷 36-44页

作者： David LOPEZ Oscar PASTOR luis Javier garcia VILLALBA Group of Analysis Security and Systems (GASS) Department of Software Engineering and Artificial Intelligence (DISIA) School of Computer Science Universidad Complutense Madrid 28040 Spain

Dynamic risk assessment refers to a risk management framework where frequent updates of risk evaluation information are used to evaluate risk exposure,as close as possible to *** this paper,we present the incident object description exchange format extended model for dynamic risk *** format attempts to overcome the absence of integration and real-time communication between security systems and risk assessment *** model is based on the incident object definition exchange format,which is commonly used in the computer security incident response teams *** data model aims to facilitate a global vision of information systems risk by supplying real-time security events data to risk assessment tools based on renowned *** present a proof-of-concept scenario to demonstrate the usefulness of this integration and the proposed data model,and discuss the expected improvements.

关键词： dynamic risk assessment risk management DRA IODEF-DRA IODEF.

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Mitochondrial Sulfide Detoxification Requires a Functional Isoform O-Acetylserine（thiol）lyase C in Arabidopsis thaliana

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Molecular Plant 2012年第6期5卷 1217-1226页

作者： Consolacien Alvarez Irene garcia luis C Romero Cecilia Gotor Instituto de Bioquimica Vegetal y Fotosintesis Consejo Superior de Investigaciones Cientificas y Universidad de Sevilla Avda. Am~rico Vespucio 49 41092Sevilla Spain

In non-cyanogenic species, the main source of cyanide derives from ethylene and camalexin biosyntheses. In mitochondria, cyanide is a potent inhibitor of the cytochrome c oxidase and is metabolized by the β-cyanoalanine synthase CYS-C1, catalyzing the conversion of cysteine and cyanide to hydrogen sulfide and β-cyanoalanine. The hydrogen sulfide released also inhibits the cytochrome c oxidase and needs to be detoxified by the O-acetylserine（thiol）lyase mitochondrial isoform, OAS-C, which catalyzes the incorporation of sulfide to O-acetylserine to produce cysteine, thus generating a cyclic pathway in the mitochondria. The loss of functional OAS-C isoforms causes phenotypic characteristics very similar to the loss of the CYS-C1 enzyme, showing defects in root hair formation. Genetic complementation with the OAS-Cgene rescues the impairment of root hair elongation, restoring the wild-type phenotype. The mitochondria compromise their capacity to properly detoxify cyanide and the resulting sulfide because the latter cannot re-assimilate into cysteine in the oas-c null mutant. Consequently, we observe an accumulation of sulfide and cyanide and of the alternative oxidase, which is unable to prevent the production of reactive oxygen species probably due to the accumulation of both toxic molecules. Our results allow us to suggest that the significance of OAS-C is related to its role in the proper sulfide and cyanide detoxification in mitochondria.

关键词： alternative oxidase Arabidopsis thaliana cysteine cyanide β-cyanoalanine synthase O-acetylserine(thiol)-lyase reactive oxygen species root hair sulfide.

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Attosecond twisted beams from high-order harmonicgeneration driven by optical vortices

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High Power Laser Science and Engineering 2017年第1期5卷 12-19页

作者： Carlos Hernandez-garcia Laura Rego Julio San Roman Antonio Picon luis Plaja Grupo de Investigacion en Aplicaciones del Laser y Fotonica Departamento de Fisica AplicadaUniversity of SalamancaE-37008SalamancaSpain Argonne National Laboratory Argonne1L 60439USA

Optical vortices are structures of the electromagnetic field with a spiral phase ramp about a point-phase singularity,carrying orbital angular momentum(OAM). Recently, OAM has been imprinted to short-wavelength radiation through high-order harmonic generation(HHG), leading to the emission of attosecond twisted beams in the extreme-ultraviolet(XUV) regime. We explore the details of the mapping of the driving vortex to its harmonic spectrum. In particular, we show that the geometry of the harmonic vortices is convoluted, arising from the superposition of the contribution from the short and long quantum paths responsible of HHG. Finally, we show how to take advantage of transverse phase-matching to select twisted attosecond beams with different spatiotemporal properties.

关键词： attosecond science extreme-ultraviolet vortices high harmonic generation orbital angular momentum twisted beams vortexbeams

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Influence of occult hepatitis B virus infection in chronic hepatitis C outcomes

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World Journal of Gastroenterology 2011年第12期17卷 1558-1562页

作者： Conrado M Fernandez-Rodriguez Maria luisa gutierrez Joséluis Lledó Maria luisa Casas Service of Gastroenterology Hospital Universitario Fundación AlcorcónUniversity King Juan CarlosAv Budapest-128922 AlcorcónMadridSpain Service of Biochemestry Hospital Universitario Fundación AlcorcónUniversity King Juan CarlosAv Budapest-128922 AlcorcónMadridSpain

Persistence of hepatitis B virus-DNA in the sera,peripheral blood mononuclear cells or in the liver of hepatitis B surface antigen(HBsAg) -negative patients with or without serological markers of previous exposure(antibodies to HBsAg and/or to HB-core antigen) defines the entity called occult hepatitis B infection(OBI).Co-infection with hepatitis B and hepatitis C viruses is frequent in highly endemic *** this co-infection increases the risk of liver disease progression,development of cirrhosis and hepatocellular carcinoma and also increases the rate of therapeutic failure to interferon-based treatments than either virus alone,a potentially negative effect of OBI on clinical outcomes and of therapeutic response to current antiviral regimes of patients with chronic hepatitis C remains inconclusive.

关键词： Occult hepatitis B infection Chronic hepatitis C Outcomes

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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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HOW MULTISPECIES INTERCROP ADVANTAGE RESPONDS TO WATER STRESS:A YIELDCOMPONENT ECOLOGICAL FRAMEWORK AND ITS EXPERIMENTAL APPLICATION

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Frontiers of Agricultural Science and Engineering 2021年第3期8卷 416-431页

作者： luis garcia-BARRIOS Yanus A.DECHNIK-VAZQUEZ The South Frontier College Panamerican and South Peripheric Avenues(w/o number)San Cristobal de las CasasChiapas 29290Mexico Pre-Planning Center of the Gulf Federal Electricity ComissionDiego de Ordaz 593Boca del RioVeracruz 94295Mexico

Absolute yield and land use efficiency can be higher in *** this phenomenon is common,it is not always the ***,these two benefits are frequently confused and do not necessarily occur *** choices become more complex when considering that multicrops are subject to strong spatial and temporal variation in average soil moisture,which will worsen with climate *** in agroecosystems is expected to buffer this impact by favoring resistance to reduced humidity,but there are few empirical/experimental studies to validate this *** is not clear if relatively higher multicrop yield and land use efficiency will persist in the face of reduced soil moisture,and how the relation between these benefits might ***,we present a relatively simple framework for analyzing this *** propose a relative multicrop resistance(RMR)index that captures all possible scenarios of absolute and relative multicrop overyield under water *** dissect the ecological components of RMR to understand the relation between higher multicrop yield and land use efficiency and the ecological causes of different overyield *** demonstrate the use of this framework with data from a 128 microplot greenhouse experiment with small annual crops,arranged as seven-species multicrops and their corresponding monocrops,all under two contrasting watering *** applied simple but robust statistical procedures to resulting data(based on bootstrap methods)to compare RMR,and its components,between different plants/plant *** also provide simple graphical tools to analyze the data.

关键词： agroecosystem sustainability crop overyielding intercrop drought resistance overyield ecological components

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Optimization of Resource in the Industry of Construction

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Journal of Civil Engineering and Architecture 2014年第9期8卷 1145-1150页

作者： Francisco Javier gutierrez garcia Pedro Perez Diaz Pedro Sanchez luis Department of Construction Engineering University of La Laguna Tenerife 38204 Spain

Time and cost are two of the most important factors to consider in each construction project. In order to maximize performance, both the client and the contractor will work to optimize both the duration of the project and its cost. We show a model of linear entire mixed programming to solve the considered problem. The aim is to minimize the project total time, by means of the assignment of equipments of work to the different production lines of the activities to realizing. The fundamental beginning is to support the same production （rate of production in meters/day of the activity in view of the equipment of work） for tbe different equipments to achieve the maximum efficiency in each period of time. With the limited availability of resources, the work must be continuous and the period of time between operations and final must be kept. However, this paper also presents the bibliographical study on methodologies of the optimization of construction processes in response to the two objectives： time and cost. This will consider the use of recta-heuristic techniques, such as population based algorithms.

关键词： Optimization construction process heuristics mathematical programming.

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