N. de las Rivas Ramírez, Guillermo Luque Aranda, Francisca Rius Díaz, Francisco Javier Pérez Frías, Tomás Sánchez‐Tamayo,
Abstract Several studies propose that Retinopathy of Prematurity (ROP) is a multifactorial disorder implicating many prenatal and postnatal factors. The objective of our study was to determine the incidence and the risk factors that influenced ROP development and progression. We retrospectively compiled data of preterms with birth weight (BW) ≤ 1.500 g and/or gestational age (GA) < 32 weeks, or BW between 1.501 and 2.000 g and/or GA ≥ 32 weeks with oxygen supply > 72 h or unstable clinical course screened ...
Tópico(s): Cardiovascular Conditions and Treatments
2022 - Nature Portfolio | Scientific Reports
David Soler, Pablo Frías, Tomás Gómez San Román, Carlos A. Platero,
The level of secondary reserve needed in a power system is traditionally settled by system operators according to engineering criteria. This paper proposes a novel methodology to determine the optimum level of secondary reserve based on both engineering and economic criteria. Within the proposed approach a price elastic-quantity demand curve for the secondary reserve is built. This approach assumes that the provision of secondary reserve is made under a competitive market. In this market, the supply ...
Tópico(s): Microgrid Control and Optimization
2009 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Power Systems
Pablo Frías, Tomás Gómez San Román, Rafael Cossent, J. Rivier,
This paper analyzes how traditional regulation of distribution system operators (DSO) has to be improved to accommodate higher levels of distributed generation (DG). In addition, new economic signals to be given to DG operators for system efficient integration are proposed. Regulatory improvements at the European level are recommended. Recommendations are centered on schemes for DSO revenue compensation to consider incremental network costs due to DG, distribution network planning integrating DG, ...
Tópico(s): Smart Grid Energy Management
2009 - Elsevier BV | International Journal of Electrical Power & Energy Systems
Pablo Frías, Tomás Gómez San Román, David Soler,
This paper presents a new approach to design reactive power capacity markets. Under this approach annual auctions to procure reactive power capacity are conducted by the system operator. Two products are defined, reactive power generation and absorption capacity, which can be supplied by different independent VAR sources, such as generators, SVCs, capacitor banks and shunt reactors. Reactive power capacity is allocated using an optimization algorithm that matches capacity bids and system reactive ...
Tópico(s): Optimal Power Flow Distribution
2008 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Power Systems
David Ocampo-Eyzaguirre, Alcira Martha Correa-Reynaga,
... Social, Economía y Derecho de la Universidad Autónoma Tomás Frías, con sede en Uncía. Para el estudio se ...
Tópico(s): Social Issues and Policies in Latin America
2022 - | Sociedad & Tecnología
... las boticarias/ritualistas k'awayu de la provincia Tomás Frías de Potosí. En el interior del atado se ...
Tópico(s): Archaeology and Rock Art Studies
2007 - Institut Français d'Études Andines | Bulletin de l’Institut français d’études andines
Inmaculada Sancho Frías, Carmen Rubio, Tomás González-Iglesias, Ángel J. Gutiérrez, Dailos González‐Weller, Arturo Hardisson,
Tópico(s): Plant and animal studies
2007 - Springer Science+Business Media | Bulletin of Environmental Contamination and Toxicology
Karin Elizabeth Guerra Delgado,
... 5to blanco de secundaria de la Unidad Educativa Tomás Frías, de la ciudad de Potosí. Se estudiaron los ...
Tópico(s): Educational Outcomes and Influences
2021 - | Revista Ecuatoriana de Psicología
Carolina Campos, Sergi Colomer-Castell, Damir García‐Cehic, Josep Gregori, Cristina Andrés, María Piñana, Alejandra González-Sánchez, Blanca Borrás-Bermejo, Oleguer Parés‐Badell, Caroline Melanie Adombi, Marta Ibañez-Lligoña, Juliana Esperalba, María Gema Codina, Ariadna Rando‐Segura, Narcı́s Saubi, Juan Ignacio Esteban, Francisco Rodríguez‐Frías, Tomàs Pumarola, Andrés Antón, Josep Quer,
The SARS-CoV-2 Omicron variant emerged showing higher transmissibility and possibly higher resistance to current COVID-19 vaccines than other variants dominating the global pandemic. In March 2020 we performed a study in clinical samples, where we found that a portion of genomes in the SARS-CoV-2 viral population accumulated deletions immediately before the S1/S2 cleavage site (furin-like cleavage site, PRRAR/S) of the spike gene, generating a frameshift and appearance of a premature stop codon. ...
Tópico(s): Animal Virus Infections Studies
2022 - Nature Portfolio | Scientific Reports
Iratxe Población, I. Torre-Fdez, Julene Aramendia, G. López-Reyes, L.M. Cabalı́n, Juan Manuel Madariaga, F. Rull, J. J. Laserna, Daniel Carrizo, Jesús Martínez‐Frías, Tomás Belenguer, Mercedes Taravillo, M. Dell’Aglio, Alessandro De Giacomo, Jennifer Huidobro, J. A. Manrique, T. Delgado, Gorka Arana, Kepa Castro, Marco Veneranda, Jose Aurelio Sanz‐Arranz, Francisco J. Fortes, Laura García‐Gómez,
Abstract A fragment of the NWA 2975 Martian meteorite, an enriched basaltic shergottite, was analysed to complete its geochemical characterisation performed 10 years ago. By this means, the feasibility of the employed techniques in a combined way for present and future space exploration missions can be tested. For this aim, Raman spectroscopy was used supported by micro energy dispersive X‐ray fluorescence (μ‐EDXRF) and laser‐induced breakdown spectroscopy (LIBS) for an accurate interpretation of ...
Tópico(s): Astro and Planetary Science
2023 - Wiley | Journal of Raman Spectroscopy
Marta Ibañez-Lligoña, Sergi Colomer-Castell, Alejandra González-Sánchez, Josep Gregori, Carolina Campos, Damir García‐Cehic, Cristina Andrés, María Piñana, Tomàs Pumarola, Francisco Rodríguez‐Frías, Andrés Antón, Josep Quer,
Epidemics and pandemics have occurred since the beginning of time, resulting in millions of deaths. Many such disease outbreaks are caused by viruses. Some viruses, particularly RNA viruses, are characterized by their high genetic variability, and this can affect certain phenotypic features: tropism, antigenicity, and susceptibility to antiviral drugs, vaccines, and the host immune response. The best strategy to face the emergence of new infectious genomes is prompt identification. However, currently ...
Tópico(s): Genomics and Phylogenetic Studies
2023 - Multidisciplinary Digital Publishing Institute | Viruses
Josep Quer, Sergi Colomer-Castell, Carolina Campos, Cristina Andrés, María Piñana, María Francesca Cortese, Alejandra González-Sánchez, Damir García‐Cehic, Marta Ibañez-Lligoña, Tomàs Pumarola, Francisco Rodríguez‐Frías, Andrés Antón, David Tabernero,
Virus pandemics have happened, are happening and will happen again. In recent decades, the rate of zoonotic viral spillover into humans has accelerated, mirroring the expansion of our global footprint and travel network, including the expansion of viral vectors and the destruction of natural spaces, bringing humans closer to wild animals. Once viral cross-species transmission to humans occurs, transmission cannot be stopped by cement walls but by developing barriers based on knowledge that can prevent ...
Tópico(s): Zoonotic diseases and public health
2022 - Multidisciplinary Digital Publishing Institute | Viruses
Josep Gregori, María Francesca Cortese, María Piñana, Carolina Campos, Damir García‐Cehic, Cristina Andrés, Josep F. Abril, María Gema Codina, Ariadna Rando‐Segura, Juliana Esperalba, Elena Sulleiro, Joan Joseph, Narcı́s Saubi, Sergi Colomer-Castell, Mari Carmen Martin, Carla Castillo, Juan Ignacio Esteban, Tomàs Pumarola, Francisco Rodríguez-Frías, Andrés Antón, Josep Quer,
A common trait among RNA viruses is their high capability to acquire genetic variability due to viral and host mechanisms. Next-generation sequencing (NGS) analysis enables the deep study of the viral quasispecies in samples from infected individuals. In this study, the viral quasispecies complexity and single nucleotide polymorphisms of the SARS-CoV-2 spike gene of coronavirus disease 2019 (COVID-19) patients with mild or severe disease were investigated using next-generation sequencing (Illumina ...
Tópico(s): CRISPR and Genetic Engineering
2021 - Taylor & Francis | Emerging Microbes & Infections
Leonardo Nieto, Josep Quer, Alicia Ruiz-Ripa, David Tabernero, Carolina González, Josep Gregori, Marta Vila, Miriam Asensio, Damir García‐Cehic, Gerardo Ruiz, Qian Chen, Laura Ordeig, Meritxell Llorens-Revull, Montserrat Saez, Juan Ignacio Esteban, Rafael Esteban, Marı́a Buti, Tomàs Pumarola, Francisco Rodríguez‐Frías,
The unequivocal identification of hepatitis C virus (HCV) subtypes 1a/1b and genotypes 2 to 6 is required for optimizing the effectiveness of interferon-free, direct-acting antiviral therapies. We compared the performance of a new real-time HCV genotyping assay used on the Cobas 4800 system (C4800) with that of high-resolution HCV subtyping (HRCS). In total, 502 samples were used, including 184 samples from chronic HCV patients (from routine laboratory activity during April 2016), 5 stored samples with ...
Tópico(s): Liver Disease Diagnosis and Treatment
2016 - American Society for Microbiology | Journal of Clinical Microbiology
... Silbario Kheswa por J. Gualberto Pedrazas. (Potosí: Universidad Tomás Frías, 1960. Pp. 113 Ilustraciones.) - Volume 5 Issue 3
Tópico(s): Spanish Linguistics and Language Studies
1963 - Cambridge University Press | Journal of Inter-American Studies
Rafael Cossent, Tomás Gómez San Román, Pablo Frías,
The European Energy Policy promotes renewable energy sources and energy efficiency as means to mitigate environmental impact, increase security of supply and ensure economic competitiveness. As a result, the penetration levels of distributed generation (DG) in electricity networks are bound to increase. Distribution networks and distribution system operators (DSOs) will be especially affected by growing levels of DG. This paper reviews the current regulation of distribution in the European Union Member ...
Tópico(s): Smart Grid Energy Management
2009 - Elsevier BV | Energy Policy
Fernando Velásquez-Orozco, Ariadna Rando‐Segura, Joan Martínez‐Campreciós, Paula Salmerón, Adrián Najarro-Centeno, Àngels Esteban, Josep Quer, Marı́a Buti, Tomàs Pumarola, Francisco Rodríguez-Frías,
Diagnosis and clinical management of people infected with hepatitis C virus (HCV) relies on results from a combination of serological and virological tests. The aim of this study was to compare the performance of dried plasma spots (DPS), prepared using the cobas® Plasma Separation Card (PSC), to plasma and serum from venipuncture, for HCV diagnosis. We carried out a prospective study using DPS and paired plasma or serum samples. Serum and DPS samples were analyzed by immunoassay using Elecsys® Anti- ...
Tópico(s): Blood groups and transfusion
2021 - Multidisciplinary Digital Publishing Institute | Diagnostics
Tópico(s): Social Sciences and Policies
1962 - Duke University Press | Hispanic American Historical Review
Noelia Díaz‐Troyano, Pablo Gabriel-Medina, Stephen G. Weber, Martin Klammer, Raquel Barquín-DelPino, Laura Castillo‐Ribelles, Àngels Esteban, M. Hernández, Roser Ferrer, Tomàs Pumarola, Francisco Rodríguez‐Frías,
Predicting disease severity in patients infected with SARS-CoV-2 is difficult. Soluble angiotensin-converting enzyme 2 (sACE2) arises from the shedding of membrane ACE2 (mACE2), which is a receptor for SARS-CoV-2 spike protein. We evaluated the predictive value of sACE2 compared with known biomarkers of inflammation and tissue damage (CRP, GDF-15, IL-6, and sFlt-1) in 850 patients with and without SARS-CoV-2 with different clinical outcomes. For univariate analyses, median differences between biomarker ...
Tópico(s): SARS-CoV-2 and COVID-19 Research
2022 - Multidisciplinary Digital Publishing Institute | Diagnostics
Tomás Crivelli, Bruno Cernuschi-Frías, Patrick Bouthémy, Jianfeng Yao,
A motion texture is an instantaneous motion map extracted from a dynamic texture. We observe that such motion maps exhibit values of two types: a discrete component at zero (absence of motion) and continuous motion values. We thus develop a mixed-state Markov random field model to represent motion textures. The core of our approach is to show that motion information is powerful enough to classify and segment dynamic textures if it is properly modeled regarding its specific nature and the local interactions ...
Tópico(s): Computer Graphics and Visualization Techniques
2013 - Society for Industrial and Applied Mathematics | SIAM Journal on Imaging Sciences
Tomás Crivelli, Patrick Bouthémy, Bruno Cernuschi-Frías, Jianfeng Yao,
In this work we present a new way of simultaneously solving the problems of motion detection and background image reconstruction. An accurate estimation of the background is only possible if we locate the moving objects. Meanwhile, a correct motion detection is achieved if we have a good available background model. The key of our joint approach is to define a single random process that can take two types of values, instead of defining two different processes, one symbolic (motion detection) and one ...
Tópico(s): Video Analysis and Summarization
2011 - Springer Science+Business Media | International Journal of Computer Vision
Carlos Mateo, Rafael Cossent, Tomás Gómez San Román, Giuseppe Prettico, Pablo Frías, Gianluca Fulli, Alexis Meletiou, Fernando Postigo,
The sustained cost reduction of solar photovoltaics (PV) modules together with the introduction of self-consumption policies is transforming passive electricity consumers into active ones (prosumers). However, self-consumption policies may present very different designs and results mainly depending on the schemes that are put in place. Policy design implementations can have important consequences on the PV sizing and on the deployment rate, which impact the overall power sector from both a technical ...
Tópico(s): Microgrid Control and Optimization
2018 - Elsevier BV | Solar Energy
Rafael Cossent, Luis Olmos, Tomás Gómez San Román, Carlos Mateo, Pablo Frías,
Abstract Nowadays, the amount of distributed generation (DG) connected to distribution networks is increasing significantly. In a European context, one of the main drivers for this growth is the support of electricity generation from renewable energy sources (RES) and combined heat and power (CHP) plants. Hence, these DG units mostly consist of non‐controllable generation. Distribution is a regulated activity which is, at least, legally and functionally unbundled from the generation activity. These ...
Tópico(s): Electric Power System Optimization
2010 - Wiley | European Transactions on Electrical Power
David Trebolle, Tomás Gómez San Román, Rafael Cossent, Pablo Frías,
The promotion of electricity generation from renewable energy sources (RES) and combined heat and power (CHP) has resulted in increasing penetration levels of distributed generation (DG). However, large-scale connection of DG involves profound changes in the operation and planning of electricity distribution networks. Distribution System Operators (DSOs) play a key role since these agents have to provide flexibility to their networks in order to integrate DG. Article 14.7 of EU Electricity Directive ...
Tópico(s): Electric Power System Optimization
2009 - Elsevier BV | Electric Power Systems Research
Francisco Rodríguez‐Frías, Josep Quer, David Tabernero, María Francesca Cortese, Selene García-García, Ariadna Rando‐Segura, Tomàs Pumarola,
Universal history is characterized by continuous evolution, in which civilizations are born and die. This evolution is associated with multiple factors, among which the role of microorganisms is often overlooked. Viruses and bacteria have written or decisively contributed to terrible episodes of history, such as the Black Death in 14th century Europe, the annihilation of pre-Columbian American civilizations, and pandemics such as the 1918 Spanish flu or the current COVID-19 pandemic caused by the ...
Tópico(s): Bacillus and Francisella bacterial research
2021 - Multidisciplinary Digital Publishing Institute | Microorganisms
María Teresa Galán‐Puchades, Mercedes Gómez-Samblás, Jose M. Suárez-Morán, Antonio Frías Osuna, Joan Sanxis-Furió, Jordi Pascual, Rubén Bueno‐Marí, Sandra Franco, Víctor Peracho, Tomás Montalvo, Màrius V. Fuentes,
We detected Leishmania infantum in 98 Norway rats (Rattus norvegicus) trapped in parks and sewers of Barcelona, Spain. The 84 rats from the sewers showed a prevalence of 33.3% and up to 2,272 estimated parasites. These results, in the most abundant potential reservoir in cities, is of public health concern.
Tópico(s): Viral Infections and Vectors
2019 - Centers for Disease Control and Prevention | Emerging infectious diseases
Tomás Mediavilla, Özgün Özalay, Héctor Estévez-Silva, B. Frias, Greger Orädd, Fahad Sultan, Claudio Brozzoli, Benjamín Garzón, Martin Lövdén, Daniel Marcellino,
From observations in rodents, it has been suggested that the cellular basis of learning-dependent changes, detected using structural MRI, may be increased dendritic spine density, alterations in astrocyte volume, and adaptations within intracortical myelin. Myelin plasticity is crucial for neurological function, and active myelination is required for learning and memory. However, the dynamics of myelin plasticity and how it relates to morphometric-based measurements of structural plasticity remains ...
Tópico(s): Neuroscience and Neuropharmacology Research
2022 - eLife Sciences Publications Ltd | eLife
Carlos Mateo, Giuseppe Prettico, Tomás Gómez San Román, Rafael Cossent, Gangale Flavia, Pablo Frías, Gianluca Fulli,
In Europe there is a great diversity of distribution grids and distribution system operators (DSOs) and a consolidated and shared knowledge of their techno-economic features is missing. This fact represents a major hindrance for fully assessing the performances of distribution grids evolving towards Smart Grids (SG) embedding low-carbon technologies, digital services and emerging actors. In order to contribute to bridge this knowledge gap, this paper presents a methodology to build representative ...
Tópico(s): Smart Grid Security and Resilience
2018 - Elsevier BV | International Journal of Electrical Power & Energy Systems
Luis Pieltain Fernandez, Tomás Gómez San Román, Rafael Cossent, Carlos Mateo, Pablo Frías,
Plug-in electric vehicles (PEVs) present environmental and energy security advantages versus conventional gasoline vehicles. In the near future, the number of plug-in electric vehicles will likely grow significantly in the world. Despite the aforementioned advantages, the connection of PEV to the power grid poses a series of new challenges for electric utilities. This paper proposes a comprehensive approach for evaluating the impact of different levels of PEV penetration on distribution network investment ...
Tópico(s): Smart Grid Energy Management
2010 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Power Systems
Tomás Gómez San Román, Carlos Mateo, Álvaro Sánchez Miralles, Pablo Frías, Rafael Cossent,
Reference Network Models (RNMs) are large-scale distribution network planning tools. RNMs can be used by policy makers and regulators to estimate efficient distribution costs. This is a very challenging task, particularly being network planning a combinatorial problem, which is especially difficult to solve due to the vast size of the distribution areas, and the use of several voltage levels. This chapter presents the main features of RNMs developed by the authors, including high performance requirements ...
Tópico(s): Power System Reliability and Maintenance
2012 - Springer Nature | Power systems