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Winkler Support Model and Nonlinear Boundary Conditions Applied to 3D Elastic Contact Problem Using the Boundary Element Method

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Acta Mechanica Solida Sinica 2019年第2期32卷 230-248页

作者： J.Vallepuga-Espinosa Lidia Sanchez-gonzalez Ivan Ubero-Martinez Departamento de Tecnologia Minera Topografiay de EstructurasUniversidad de LeonCampus de Vegazana s/n24071 LeonSpain Departamento de Ingenierias Mecanica Informatica y AeroespacialUniversidad de LeonCampus de Vegazana s/n24071 LeonSpain

This work presents a numerical methodology for modeling the Winkler supports and nonlinear conditions by proposing new boundary conditions. For the boundary conditions of Winkler support model, the surface tractions and the displacements normal to the surface of the solid are unknown, but their relationship is known by means of the ballast coefficient, whereas for nonlinear boundary conditions, the displacements normal to the boundary of the solid are zero in the positive direction but are allowed in the negative direction. In those zones, detachments of nodes might appear, leading to a nonlinearity, because the number of nodes that remain fixed or of the detached ones (under tensile tractions) is unknown. The proposed methodology is applied to the 3D elastic receding contact problem using the boundary element method. The surface t r actions and the displacements of the common int erface bet ween the two solids in contac t under the influence of different supports are calculated as well as the boundary zone of the solid where the new boundary conditions are applied. The problem is solved by a double-iterative met hod, so in the final solut ion, t here are no t r act ions or pene trations between the two solids or at the boundary of the solid where the nonlinear boundary conditions are Simula ted. The effectiveness of the proposed method is verified by examples.

关键词： Boundary element method Elastic contact problem Winkler support model Nonlinear boundary conditions

Decoupled Photovoltaic Power Ramp-rate Calculation Method for Perturb and Observe Algorithms

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Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 932-940页

作者： Jose Miguel Riquelme-Dominguez Francisco M.gonzalez-Longatt Sergio Martinez Electrical Engineering Department Escuela Tecnica Superior de Ingenieros IndustrialesUniversidad Politecnica de Madrid28006 MadridSpain Department of Electrical Engineering Information Technology and CyberneticsUniversity of South-Eastern Norway3918 PorsgrunnNorway

As photovoltaic energy increasingly penetrates in power systems,transmission system operators have started to request its participation in providing ancillary *** of the demanded services is the power ramp-rate control(PRRC),which attempts to limit the power ramps produced by intermittent irradiance *** order to achieve the desired objective,solutions based on storage systems or modifying the maximum power point tracking(MPPT)in perturb and observe(P&O)algorithms are commonly *** starting point in PRRC is the determination of the instantaneous power ramprate,and different methods have been proposed in the literature for its ***,the accuracy and computational speed of existing procedures can be improved,which may be critical in situations with rapid irradiance *** this paper,a decoupled photovoltaic power ramp-rate calculation method is presented,in which the effect of variable irradiance and the P&O algorithm are computed *** proposed method has been theoretically demonstrated and tested through simulation and experimental *** results show that it can improve the previous methods in terms of accuracy and computation *** validation with hardware-inthe-loop demonstrates the suitability of the proposed method for real-time applications,even in presence of noisy measurements.

关键词： Hardware-in-the-loop maximum power point tracking perturb and observe photovoltaic power ramp-rate control ramp-rate calculation method

Particulate matter characterization in a steelworks using conventional sampling and innovative lidar observations

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Particuology 2016年第5期14卷 43-51页

作者： Benjamin Guinot Beatriz gonzalez Julia Perim De Faria Sumita Keclia Laboratoire d'Aerologie Universite de Toulouse CNRS Universite Paul-Sabatier 14 Avenue Edouard-Belin 31400 Toulouse France

Particulate matter （PM） emissions from steelworks cause public concern. Although end-of-pipe and pro- cess integrated measures have led to a significant drop in emissions of large particles from stacks, fine aerosols were not specifically considered, nor were emissions from fugitive and open sources. In this study, we deployed aerosol samplers together with a scanning ultra-violet （UV） lidar to characterize total suspended particles （TSP）, PM10, and PM2.5, in emissions from a large integrated steelworks in Spain over a 16-day period. We determined the content of carbonaceous, soluble inorganic, mineral dust, and metal species. A positive matrix factorization was carried out on our dataset. Despite mineral dust being predominant in all size fractions, the steelworks was clearly a source of carbonaceous species, resulting in production of secondary inorganic aerosols. In particular, stack emissions were a major contributor of fine particles, while open sources dominated the emissions of TSP, yielding up to 80% of particles larger than PM10. UV lidar provided 2D maps of aerosols in real time, with an ability to detect PM emissions and to visualize complex plumes. We suggest that air quality management of steelworks needs to focus on controlling large and coarse oarticle emissions, esoeciallv those from onen sources.

关键词： Fine aerosols Fugitive emissions Open sources Chemical composition Trace metals UV lidar

From the backyard to collective gardens in the “blue-courtyard”: Reversing the process of upgrading historic timber-framed courtyard buildings in Madrid

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Frontiers of Architectural Research 2024年第2期13卷 265-283页

作者： Esperanza gonzalez-Redondo Department of Architecture University of AlcalaMadridSpain

This paper presents an analytical framework for evaluating the impact of the two main processes identified in Madrid timber-framed courtyard buildings reinforcing the courtyard's crucial role in architectural heritage sustainability:their development caused dwellings to darken(1737–1950),and the existing challenge is to open new patios according to the listed buildings'protection *** findings in archival research and existing building assessments led to completed data collection and *** exploring construction expansion,from the house towards the collective prototype around a gradually reduced patio and dwelling darkening(1737–1786),buildings resulted in open,semiopen,underlighted and closed *** area on-site assessment uncovered the transition from the older low-rise type(1–3)floors to the modern closed model of up to(4–6)*** enlargements,consequently reducing original green areas and courtyards,call for reversing that process or formulating a new *** debates the partial demolition of listed buildings in upgrades and its agreement with the needed“blue courtyard”strategy(PGOUM),resulting from joining new rear individual patios to create a communal building block *** uncovered“in-between”type(1864),which integrates two open-air collective spaces,an inner courtyard and a back garden,appears challenging to explore.

关键词： Courtyard Sustainabledesign Architectural heritage Archives Timber-framed construction Social housing

Glial plasticity after hexahydrobenzene exposure

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Neural Regeneration Research 2016年第3期11卷 404-405页

作者： Tania Campos-Ordonez Oscar gonzalez-Perez Laboratory of Neurobiology School of PsychologyUniversity of Colima Medical Sciences PhD Program School of MedicineUniversity of Colima

The organic solvents are not only utilized in industrial processes,but also as drugs of *** fact,solvent consumption represents the fourth option for drug users just after alcohol,tobacco and *** humans,intentional in... 详细信息

关键词： intentional tobacco plasticity utilized volatile alcohol exposure abuse morphological microglia

Oxidative effects of the harmful algal blooms on primary organisms of the food web

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BIOCELL 2019年第2期43卷 41-50页

作者： JOAQUIN CABRERA PAULA MARIELA gonzalez SUSANA PUNTARULO Universidad de Buenos Aires Facultad de Farmacia y BioquimicaFisicoquimica.Buenos AiresArgentina CONIONI CETET-Universidad de Buenos Aires.Instituto de Bioquimica y Medicina Molecular(IBI IBI MOLOL).Buenos Aires Argentina

Degraded water quality from nutrient pollution,physical,biological,and other chemical factors contributes to the development and persistence of many harmful algal blooms(HAB s).The complex dynamics of the HAB s is a challenge to marine ecosystems for the toxic effects *** consequences include fish,bird,and mammal mortality,respiratory or digestive tract problems,memory loss,seizures,lesions and skin irritation in many *** review is intended to briefly summarize the recent reported information on harmful marine toxin deleterious effects over the primary organisms of the food web,namely algae,zooplankton and *** focus is made on oxidative stress status of cells and *** though in situ field research is less controlled than laboratory studies,in which the organisms are directly exposed to the toxins under consideration,both types of approaches are required to fully understand such a complex *** top of that,the contribution of the increasing water temperatures in the sea,as a consequence of the global climate change,will be addressed as a topic for further studies,to evaluate the effect on regulating algal growth,species composition,trophic structure,metabolic stress and function of aquatic ecosystems.

关键词： Harmful algal toxins oxidative stress algae zooplankton invertebrates

NADPH Thioredoxin Reductase C Controls the Redox Status of Chloroplast 2-Cys Peroxiredoxins in Arabidopsis thaliana

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Molecular Plant 2009年第2期2卷 298-307页

作者： Kerstin Kirchsteiger Pablo Pulido Maricruz gonzalez Francisco Javier Cejudo Instituto de Bioquimica Vegetal y Fotosintesis Universidad de Sevilla and CSIC Avda Americo Vespucio 49 41092-Sevilla Spain

Chloroplast 2-Cys peroxiredoxins （2-Cys Prxs） are efficiently reduced by NADPH Thioredoxin reductase C （NTRC）. To investigate the effect of light/darkness on NTRC function, the content of abundant plastidial enzymes, Rubisco, glutamine synthetase （GS）, and 2-Cys Prxs was analyzed during two consecutive days in Arabidopsis wild-type and ntrc mutant plants. No significant difference of the content of these proteins was observed during the day or the night in wildtype and mutant plants. NTRC deficiency caused a lower content of fully reduced 2-Cys Prxs, which was undetectable in darkness, suggesting that NTRC is the most important pathway for 2-Cys Prx reduction, probably the only one during the night. Arabidopsis contains two plastidial 2-Cys Prxs, A and B, for which T-DNA insertion lines were characterized showing the same phenotype as wild-type plants. Two-dimensional gel analysis of leaf extracts from these mutants allowed the identification of basic and acidic isoforms of 2-Cys Prx A and B. In-vitro assays and mass spectrometry analysis showed that the acidic isoform of both proteins is produced by overoxidation of the peroxidatic Cys residue to sulfinic acid. 2-Cys Prx overoxidation was lower in the NTRC mutant. These results show the important function of NTRC to maintain the redox equilibrium of chloroplast 2-Cys Prxs.

关键词： Chloroplast peroxiredoxin NADPH thioredoxin reductase C overoxidation thioredoxin Arabidopsis.

Parking Availability Prediction with Coarse-Grained Human Mobility Data

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Computers, Materials & Continua 2022年第6期71卷 4355-4375页

作者： Aurora gonzalez-Vidal Fernando Terroso-Sáenz Antonio Skarmeta University of Murcia Murcia30003Spain Universidad Católica de Murcia(UCAM) Murcia30107Spain

Nowadays,the anticipation of parking-space demand is an instrumental service in order to reduce traffic congestion levels in urban *** purpose of our work is to study,design and develop a parking-availability predictor that extracts the knowledge from human mobility data,based on the anonymized human displacements of an urban area,and also from weather *** of the existing solutions for this prediction take as contextual data the current road-traffic state defined at very high temporal or spatial ***,access to this type of fine-grained location data is usually quite limited due to several economic or privacy-related *** overcome this limitation,our proposal uses urban areas that are defined at very low spatial and temporal *** conducted several experiments using three Artificial Neural Networks:Multilayer Perceptron,Gated Recurrent Units and bidirectional Long Short Term Memory networks and we tested their suitability using different combinations of *** metrics are provided for the sake of comparison within our study and between other *** solution has been evaluated in a real-world testbed in the city of Murcia(Spain)integrating an open human-mobility dataset showing high accuracy.A MAPE between 4%and 10%was reported in horizons of 1 to 3 h.

关键词： Parking space human mobility mining recurrent neural networks prediction

Spectrum of anemia associated with chronic liver disease

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World Journal of Gastroenterology 2009年第37期15卷 4653-4658页

作者： Rosario gonzalez-Casas E Anthony Jones Ricardo Moreno-Otero Digestive Disease Service and Center for Investigation of Hepatic and Digestive Diseases University Hospital La Princesa Autonomous University of Madrid Madrid 28006 Spain

Anemia of diverse etiology is a common complication of chronic liver diseases. The causes of anemia include acute or chronic gastrointestinal hemorrhage, and hypersplenism secondary to portal hypertension. Severe hepatocellular disease predisposes to hemorrhage because of impaired blood coagulation caused by deficiency of blood coagulation factors synthesized by hepatocytes, and/or thrombocytopenia. Aplastic anemia, which is characterized by pancytopenia and hypocellular bone marrow, may follow the development of hepatitis. Its presentation includes progressive anemia and hemorrhagic manifestations. Hematological complications of combination therapy for chronic viral hepatitis include clinically signif icant anemia, secondary to treatment with ribavirin and/or interferon. Ribavirininduced hemolysis can be reversed by reducing the dose of the drug or discontinuing it altogether. Interferons may contribute to anemia by inducing bone marrow suppression. Alcohol ingestion is implicated in the pathogenesis of chronic liver disease and may contribute to associated anemia. In patients with chronic liver disease, anemia may be exacerbated by defi ciency of folic acid and/or vitamin B12 that can occur secondary to inadequate dietary intake or malabsorption.

关键词： Anemia Liver disease Liver failure Aplastic anemia Pegylated interferon Ribavirin Alcohol