96 research outputs found
USV based automatic deployment of booms along quayside mooring ships: scaled experiments and simulations
This article explores possible uses of marine Unmanned Surface Vehicles (USV) for the fully automatic deployment of containment booms along quayside mooring ships. The task of the USV is to tow the boom along adequate trajectories. The target is the prevention of contaminant spills in harbors or near the coast, for example during crude transfers. Surrounding ships with booms is becoming a common practice. This scenario belongs to the target of our research: to transfer robotic techniques to marine applications. The article experimentally shows that the USV based automatic deployment can be done, in accordance with a suitable planning in terms of waypoints. Actually, the article presents a successful automatic deployment, with a scale USV and a 50 m long experimental light boom. For the purposes of the research a set of models, of the boom, cables, and the USV dynamics, have been established. Based on these models, a simulation platform has been developed. The platform has been employed for analyzing and planning of experiments, and for the simulation of a real scale boom deployment scenario described in the article. Some recommendations are included in the final section
Evaluación del impacto del perfil del alumnado en la valoración de la actividad docente del profesorado
En este proyecto se analiza el perfil de los estudiantes de primer curso en tres Grados (Química, Biología y Óptica-Optometría) de las Facultades de Ciencias de la UCM, detectando las carencias que presentan los estudiantes en una materia básica como la Química. Se comparan los resultados con los obtenidos en el curso académico 2016-2017. Asimismo se analiza la relación del perfil del alumnado con la valoración de la actividad docente del profesorado que realizan los estudiantes dentro del programa DOCENTIA
Regioirregular and catalytic Mizoroki-Heck reactions
[EN] The palladium-catalysed cross-coupling reaction between alkenes and aryl halides (the Mizoroki-Heck reaction) is a powerful methodology to construct new carbon-carbon bonds. However, the success of this reaction is in part hampered by an extremely marked regioselectivity on the double bond, which dictates that electron-poor alkenes react exclusively on the beta-carbon. Here, we show that ligand-free, few-atom palladium clusters in solution catalyse the alpha-selective intramolecular Mizoroki-Heck coupling of iodoaryl cinnamates, and mechanistic studies support the formation of a sterically encumbered cinnamate-palladium cluster intermediate. Following this rationale, the alpha-selective intermolecular coupling of aryl iodides with styrenes is also achieved with palladium clusters encapsulated within fine-tuned and sterically restricted zeolite cavities to produce 1,1-bisarylethylenes, which are further engaged with aryl halides by a metal-free photoredox-catalysed coupling. These ligand-free methodologies significantly expand the chemical space of the Mizoroki-Heck coupling.This work was supported by MINECO (Spain, projects CTQ 2017-86735-P, PID2019-105391GB-C22 and MAT2017-82288-C2-1-P, Severo Ochoa programme SEV-2016-0683 and the Juan de la Cierva programme). F.G.-P. and R.G. thank ITQ for the concession of a contract. J.O.-M. acknowledges the Juan de la Cierva programme for the concession of a contract, and R.P.-R. and J.C.-S. thank the Plan GenT programme (CIDEGENT/2018/044) funded by Generalitat Valenciana. HR STEM measurements were performed at DME-UCA in Cadiz University, with financial support from FEDER/MINECO (PID2019-110018GA-I00 and PID2019-107578GA-I00). We acknowledge ALBA Synchrotron for allocating beamtime and CL AE SS beamline staff for their technical support during our experiment.Garnes-Portoles, F.; Greco, R.; Oliver-Meseguer, J.; Castellanos-Soriano, J.; Jiménez Molero, MC.; Lopez-Haro, M.; Hernández-Garrido, JC.... (2021). Regioirregular and catalytic Mizoroki-Heck reactions. Nature Catalysis. 4(4):293-303. https://doi.org/10.1038/s41929-021-00592-3S2933034
Aprendizaje mentorizado en grupo y evaluación formativa metacognitiva centrados en el perfil preuniversitario del alumnado de primer curso de grado
Depto. de Química InorgánicaDepto. de Química OrgánicaFac. de Ciencias QuímicasFALSEVicerrectorado de Calidad de la Universidad Complutense de Madridsubmitte
Early Pliocene climatic optimum, cooling and early glaciation deduced by terrestrial and marine environmental changes in SW Spain
The Pliocene is a key period in Earth's climate evolution, as it records the transition from warm and stable conditions to the colder and more variable glaciated climate of the Pleistocene. Simultaneously, climate became more seasonal in the Mediterranean area, and Mediterranean-type seasonal precipitation rhythm with summer drought established. These climatic changes presumably had significant impacts on terrestrial environments. However, the response of terrestrial environments to such climate changes is still not fully understood due to the lack of detailed studies dealing with this period of time. In this study, multiproxy analyses of continuous core sampling from La Matilla (SW Spain) shows detailed and continuous record of pollen, sand content and abundance of benthic foraminifer Bolivina spathulata to describe paleoenvironmental and paleoclimate trends during the early Pliocene. This record shows warmest, most humid climate conditions and highest riverine nutrient supply at ~ 4.35 Ma, coinciding with the Pliocene climatic optimum and high global sea level. A climate cooling and aridity trend occurred subsequently and a significant glaciation occurred at ~ 4.1–4.0 Ma, during a period known by very little terrestrial evidence of glaciation. Our multiproxy data thus indicate that terrestrial and marine environments were significantly variable during the early Pliocene and that major glaciation-like cooling occurred before the intensification of northern hemisphere glaciation at the beginning of the Pleistocene (~2.7 Ma). This major climate cooling and aridity maxima between 4.1 and 4.0 Ma is independently validated by a coeval sea-level drop (third order Za2 sequence boundary). This sea level drawdown is supported by enhanced coarse sedimentation and minima in riverine nutrient supply, showing paired vegetation and sea-level changes and thus a strong land-ocean relationship. This study also shows that long-term climatic trends were interrupted by orbital-scale cyclic climatic variability, with eccentricity, obliquity and precession acting as the main triggers controlling climate and environmental change in the area.Peer ReviewedPostprint (author's final draft
Mentoría y aprendizaje significativo enfocado en estudiantes de primer curso de universidad: necesidades, expectativas y logros
Depto. de Química OrgánicaFac. de Ciencias QuímicasFALSEVicerrectorado de Calidad de la Universidad Complutense de Madridsubmitte
Single nucleotide variations in ZBTB46 are associated with post-thrombolytic parenchymal haematoma
Haemorrhagic transformation is a complication of recombinant tissue-plasminogen activator treatment. The most severe form, parenchymal haematoma, can result in neurological deterioration, disability, and death. Our objective was to identify single nucleotide variations associated with a risk of parenchymal haematoma following thrombolytic therapy in patients with acute ischaemic stroke. A fixed-effect genome-wide meta-analysis was performed combining two-stage genome-wide association studies (n = 1904). The discovery stage (three cohorts) comprised 1324 ischaemic stroke individuals, 5.4% of whom had a parenchymal haematoma. Genetic variants yielding a P-value < 0.05 1 x 10(-5) were analysed in the validation stage (six cohorts), formed by 580 ischaemic stroke patients with 12.1% haemorrhagic events. All participants received recombinant tissue-plasminogen activator; cases were parenchymal haematoma type 1 or 2 as defined by the European Cooperative Acute Stroke Study (ECASS) criteria. Genome-wide significant findings (P < 5 x 10(-8)) were characterized by in silica functional annotation, gene expression, and DNA regulatory elements. We analysed 7 989 272 single nucleotide polymorphisms and identified a genome-wide association locus on chromosome 20 in the discovery cohort; functional annotation indicated that the ZBTB46 gene was driving the association for chromosome 20. The top single nucleotide polymorphism was rs76484331 in the ZBTB46 gene [P = 2.49 x 10(-8); odds ratio (OR): 11.21; 95% confidence interval (CI): 4.82-26.55]. In the replication cohort (n = 580), the rs76484331 polymorphism was associated with parenchymal haematoma (P = 0.01), and the overall association after meta-analysis increased (P = 1.61 x 10(-8), OR: 5.84; 95% CI: 3.16-10.76). ZBTB46 codes the zinc finger and BTB domain-containing protein 46 that acts as a transcription factor. In silica studies indicated that ZBTB46 is expressed in brain tissue by neurons and endothelial cells. Moreover, rs76484331 interacts with the promoter sites located at 20q13. In conclusion, we identified single nucleotide variants in the ZBTB46 gene associated with a higher risk of parenchymal haematoma following recombinant tissue-plasminogen activator treatment.Peer reviewe
Spanish National Hip Fracture Registry (RNFC) : First-year results and comparison with other registries and prospective multi-centric studies from Spain
Fundamentos: El Registro Nacional de Fracturas de Cadera (RNFC) es un registro español multicéntrico, prospectivo y continuo, que comenzó en 2017. El objetivo de este artículo fue presentar los datos del primer informe anual y compararlos con los registros autonómicos y los estudios multicéntricos realizados recientemente en España. Métodos: Se incluyeron las personas de 75 años o más atendidas con el diagnóstico de fractura de cadera por fragilidad en alguno de los hospitales participantes en el RNFC, entre enero y octubre de 2017. En el análisis estadístico se utilizó la media y desviación estándar o mediana y rangos intercuartílicos para las variables numéricas y los porcentajes para las variables categóricas. Se realizó un análisis descriptivo global de la casuística y se comparó con los datos disponibles de los estudios previos mencionados. Resultados: Se registraron 7.208 personas de 54 hospitales, con una edad media de 86,7 años (DE 5,6). El 75,4% fueron mujeres y el 36,4% presentaron deterioro cognitivo previo. La demora quirúrgica media fue de 75,7 horas (DE 63,6) y la estancia media fue de 10,9 días (DE 6,7). De las personas que vivían en un domicilio antes de la fractura (75,4%), menos de la mitad (37,0%) volvieron a él tras el alta hospitalaria. Al mes, había fallecido el 7,1%. La comparación con los otros estudios mostró algunas diferencias importantes, sobre todo en la ubicación previa, en el porcentaje de pacientes institucionalizados de novo (7,7-29,4%) y en el porcentaje con tratamiento antiosteoporótico al alta (14,5-36,7%). Conclusiones: El RNFC es la mayor base de datos prospectiva que aporta datos sobre el perfil de los pacientes hospitalizados por fractura de cadera en España. La comparación con otros estudios recientes muestra algunas diferencias importantes.OBJECTIVE: The Spanish National Hip Fracture Registry (Registro Nacional de Fracturas de Cadera or RNFC) is a Spanish, prospective, multi- centric registry, commenced in 2017. The goal of this paper is to present the data from the first annual report and to compare them with autonomic registries and recent prospective multi-centric studies performed in Spain. METHODS: We included persons 75 years or older treated for fragility hip fractures in any of the centers participating in the RNFC between January and October 2017. The descriptive statistics of each variable used the mean (and standard deviation) or the median (and interquartile ranges) for the ordinal variables and the percentage for the categoric variables. A descriptive analysis of the casemix was performed and compared with available data from the aforementioned studies. RESULTS: The RNFC included 7.208 patients from 54 hospitals, with a mean age of 86.7 (SD 5.6) years; 75.4% were women, and 36.4% showed cognitive decline. Mean surgical delay was 75.7 (SD 63.6) hours, and length of stay averaged 10.9 (SD 6.7) days. Of the patients who lived at home (75.4%), less than half (37.0%) returned home at discharge. One-month mortality was 7.1%. Comparison with other studies showed important differences, especially regarding patients newly sent to nursing homes (7.7-29.4%) and with antiosteoporotic treatment at discharge (14.5-36.7%). CONCLUSIONS: The RNFC is the largest prospective database to date that offers data regarding the characteristics of patients hospitalized for hip fractures in Spain. Comparison with recent studies showed some important differences
Registro Nacional de Fracturas de Cadera (RNFC): Resultados del primer año y comparación con otros registros y estudios multicéntricos españoles
Background: The Spanish National Hip
Fracture Registry (Registro Nacional de Fracturas
de Cadera or RNFC) is a Spanish, prospective, multi-
centric registry, commenced in 2017. The goal of
this paper is to present the data from the first annual
report and to compare them with autonomic registries
and recent prospective multi-centric studies
performed in Spain.
Methods: We included persons 75 years of age
or older treated for fragility hip fractures in any
of the centers participating in the RNFC between
January and October 2017. The descriptive statistics
of each variable used the mean (and standard
deviation) or the median (and interquartile ranges)
for the ordinal variables and the percentage for the
categoric variables. A descriptive analysis of the casemix
was performed and compared with available
data from the aforementioned studies.
Results: The RNFC included 7.208 patients
from 54 hospitals, with a mean age of 86.7 (SD
5.6) years; 75.4% were women, and 36.4% showed
cognitive decline. Mean surgical delay was 75.7
(SD 63.6) hours, and length of stay averaged 10.9
(SD 6.7) days. Of the patients who lived at home
(75.4%), less than half (37.0%) returned home
at discharge. One-month mortality was 7.1%.
Comparison with other studies showed important
differences, especially regarding patients newly
sent to nursing homes (7.7-29.4%) and with antiosteoporotic
treatment at discharge (14.5-36.7%).
Conclusions: The RNFC is the largest prospective
database to date that offers data regarding
the characteristics of patients hospitalized for hip
fractures in Spain. Comparison with recent studies
showed some important differencesFundamentos: El Registro Nacional de
Fracturas de Cadera (RNFC) es un registro español
multicéntrico, prospectivo y continuo, que comenzó
en 2017. El objetivo de este artículo fue presentar
los datos del primer informe anual y compararlos
con los registros autonómicos y los estudios
multicéntricos realizados recientemente en España.
Métodos: Se incluyeron las personas de 75
años o más atendidas con el diagnóstico de fractura
de cadera por fragilidad en alguno de los hospitales
participantes en el RNFC, entre enero y octubre de
2017. En el análisis estadístico se utilizó la media y
desviación estándar o mediana y rangos intercuartílicos
para las variables numéricas y los porcentajes
para las variables categóricas. Se realizó un análisis
descriptivo global de la casuística y se comparó
con los datos disponibles de los estudios previos
mencionados.
Resultados: Se registraron 7.208 personas de
54 hospitales, con una edad media de 86,7 años
(DE 5,6). El 75,4% fueron mujeres y el 36,4%
presentaron deterioro cognitivo previo. La demora
quirúrgica media fue de 75,7 horas (DE 63,6)
y la estancia media fue de 10,9 días (DE 6,7). De
las personas que vivían en un domicilio antes de la
fractura (75,4%), menos de la mitad (37,0%) volvieron
a él tras el alta hospitalaria. Al mes, había
fallecido el 7,1%. La comparación con los otros estudios
mostró algunas diferencias importantes, sobre
todo en la ubicación previa, en el porcentaje de
pacientes institucionalizados de novo (7,7-29,4%)
y en el porcentaje con tratamiento antiosteoporótico
al alta (14,5-36,7%).
Conclusiones: El RNFC es la mayor base de
datos prospectiva que aporta datos sobre el perfil
de los pacientes hospitalizados por fractura de cadera
en España. La comparación con otros estudios
recientes muestra algunas diferencias importantesThe RNFC has been financed through donations by AMGEN SA, UCB Pharma, Abbott Laboratories and FAES Farma, as well as a Research Grant from the Fundación Mutua Madrileña (AP169672018)
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