249 research outputs found
SURVIVAL IN THE CLASSROOM, A METHODOLOGICAL
El objetivo del presente trabajo fue adaptar la supervivencia en el medio natural al contexto educativo con el fin de proporcionar al alumnado una primera experiencia, hacerlo consciente de las posibilidades que ofrece este medio para su desarrollo personal y concienciarlo sobre valores de respeto y cuidado del medio ambiente. Para ello se llevo a cabo una dinámica grupal que a su vez fue un gran juego de roles, en el cuál se intervino sobre diferentes variables y elementos tales como el espacio, el tiempo y el material utilizado. Los alumnos debían trabajar en grupo y cohesionados para resolver una serie de problemas que se les iban planteando. En función de unos criterios cualitativos y cuantitativos se asignaba una puntuación a la solución dada y se les aplicaban una serie incentivos/impedimentos los cuales condicionaban la práctica y hacían que esta tuviera un gran grado de incertidumbre. La metodología utilizada fue el aprendizaje por problemas (estilo de enseñanza cognoscitivo). Con todo esto se pretendía que el alumno se implicara en la actividad desde el principio hasta el fin, fomentando su desarrollo físico, cognitivo y conductual.The aim of this study was to adapt the survival in the natural environment to the educational in order to provide students a first experience, sensitize them of the potential activities in the natural environment for personal development and education about values of respect and environment protection. A group dynamic which in turn was a great role play was carried out. It conditioned different variables and elements such as space, time and material used. Students must work in cohesive groups to resolve a problems. The solution provided by students was evaluated and punctuated according to qualitative and quantitative criteria. In addition, they received incentives / impediments which conditioned the practice and caused great uncertainty in practice. The problem-based learning (cognitive teaching style) was the methodology used. With all of this was intended that students become involved in the activity from the beginning to the end, promoting their physical, cognitive and behavioral development.Actividad Física y Deport
Optimizing the search for resources by sharing information: Mongolian gazelles as a case study
We investigate the relationship between communication and search efficiency in a biological context by proposing a model of Brownian searchers with long-range pairwise interactions. After a general study of the properties of the model, we show an application to the particular case of acoustic communication among Mongolian gazelles, for which data are available, searching for good habitat areas. Using Monte Carlo simulations and density equations, our results point out that the search is optimal (i.e., the mean first hitting time among searchers is minimum) at intermediate scales of communication, showing that both an excess and a lack of information may worsen it. © 2013 American Physical Society.R. M.-G. is supported by the JAEPredoc program of CSIC. R. M.-G. and C. L. acknowledge support from MICINN (Spain) and FEDER (EU) through Grant No. FIS2007-60327 FISICOS. J. M. C. and T. M. were supported by a U.S. National Science Foundation grant (ABI 1062411).Peer Reviewe
Comparative study of nordihydroguaiaretic acid extraction methods from creosote bush (Larrea tridentata)
Anthropometric Values in Spanish Elite Soccer: Differences between Divisions and Playing Positions
Body composition is an important factor in a soccer player’s performance, and anthropometry is one of the most widely used methods of measurement. The physical demands of Spanish soccer have evolved over time, so the ideal body composition requirements must be adapted to the present day. The aim of this study was to describe the anthropometric and body composition profiles of professional soccer players in the second, second B, and third divisions during the 2019–2020 season in order to compare the anthropometric parameters of players among positions and competitive divisions. A cross-sectional study was conducted to determine differences in kinanthropometric and derived variables in a sample of Spanish soccer players. A total of 615 soccer players from the second (116 players), second B (310 players), and third (189 players) divisions participated in this study. After comparing the groups according to the playing position and category, it was observed that at higher levels of play, soccer players show lower values of fat mass (FM) and higher values of muscle mass (MM) and bone mass (BM); at lower levels of play, soccer players show more anthropometric differences between playing positions. Lastly, the somatotype of the elite soccer player is balanced mesomorphic, with higher levels of mesomorphy at higher levels of play. In summary, this is the first study to evaluate the body composition of the different Spanish soccer divisions
The evolution of Balmer jump selected galaxies in the ALHAMBRA survey
We present a new color-selection technique, based on the Bruzual & Charlot
models convolved with the bands of the ALHAMBRA survey, and the redshifted
position of the Balmer jump to select star-forming galaxies in the redshift
range 0.5 < z < 1.5. These galaxies are dubbed Balmer jump Galaxies BJGs. We
apply the iSEDfit Bayesian approach to fit each detailed SED and determine
star-formation rate (SFR), stellar mass, age and absolute magnitudes. The mass
of the haloes where these samples reside are found via a clustering analysis.
Five volume-limited BJG sub-samples with different mean redshifts are found to
reside in haloes of median masses slightly
increasing toward z=0.5. This increment is similar to numerical simulations
results which suggests that we are tracing the evolution of an evolving
population of haloes as they grow to reach a mass of at z=0.5. The likely progenitors of our samples at z3 are Lyman
Break Galaxies, which at z2 would evolve into star-forming BzK galaxies,
and their descendants in the local Universe are elliptical galaxies.Hence, this
allows us to follow the putative evolution of the SFR, stellar mass and age of
these galaxies. From z1.0 to z0.5, the stellar mass of the volume
limited BJG samples nearly does not change with redshift, suggesting that major
mergers play a minor role on the evolution of these galaxies. The SFR evolution
accounts for the small variations of stellar mass, suggesting that star
formation and possible minor mergers are the main channels of mass assembly.Comment: 14 pages, 10 figures. Submitted to A&A. It includes first referee's
comments. Abstract abridged due to arXiv requirement
Interconvertible Hydrochlorothiazide–Caffeine Multicomponent Pharmaceutical Materials: A Solvent Issue
The design of new multicomponent pharmaceutical materials that involve different active
pharmaceutical ingredients (APIs), e.g., drug-drug cocrystals, is a novel and interesting approach
to address new therapeutic challenges. In this work, the hydrochlorothiazide-caffeine (HCT–CAF)
codrug and its methanol solvate have been synthesized by mechanochemical methods and thoroughly
characterized in the solid state by powder and single crystal X-ray diffraction, respectively, as well as
differential scanning calorimetry, thermogravimetric analyses and infrared spectroscopy. In addition,
solubility and stability studies have also been performed looking for improved physicochemical
properties of the codrug. Interestingly, the two reported structures show great similarity, which allows
conversion between them. The desolvated HCT–CAF cocrystal shows great stability at 24 h and an
enhancement of solubility with respect to the reference HCT API. Furthermore, the contribution of
intermolecular forces on the improved physicochemical properties was evaluated by computational
methods showing strong and diverse H-bond and π–π stacking interactions.Spanish Agencia Estatal de Investigacion of the Ministerio de Ciencia, Innovacion y Universidades (MICIU)European Union (EU)
PGC2018-102047-B-I00MICIU/AEI from SPAIN
CTQ2017-85821-
SmartFD: A Real Big Data Application for Electrical Fraud Detection
The main objective of this paper is the application of big
data analytics to a real case in the field of smart electric networks. Smart
meters are not only elements to measure consumption, but they also con stitute a network of millions of sensors in the electricity network. These
sensors provide a huge amount of data that, once analyzed, can lead to
significant advances for the society. In this way, tools are being developed
in order to reach certain goals, such as obtaining a better consumption
estimation (which would imply a better production planning), finding
better rates based on the time discrimination or the contracted power,
or minimizing the non-technical losses in the network, whose actual costs
are eventually paid by end-consumers, among others. In this work, real
data from Spanish consumers have been analyzed to detect fraud in con sumption. First, 1 TB of raw data was preprocessed in a HDFS-Spark
infrastructure. Second, data duplication and outliers were removed, and
missing values handled with specific big data algorithms. Third, cus tomers were characterized by means of clustering techniques in different
scenarios. Finally, several key factors in fraud consumption were found.
Very promising results were achieved, verging on 80% accuracyMinisterio de Economía y Competitividad TIN2014-55894-C2-RMinisterio de Economía y Competitividad TIN2017-88209-C2-
First record of the alien pest Rhaponticum repens (Compositae) in the Iberian Peninsula
First record of the alien pest Rhaponticum repens (Compositae) in the Iberian Peninsula.- Rhaponticum repens is reported for the first time for the flora of the Iberian Peninsula. The species is native from Central Asia and has become invasive in Argentina, Canada, Europe and the USA. It was detected for the first time in abandoned fields from Vilablareix, near the city of Girona (Catalonia, Spain) and in the valley of the Vinalopó in Alicante (Valencia, Spain), where it was collected as early as in 1959 but misdentified. Molecular data, based on nrDNA region ITS, suggest that the reported populations may be closely related to plants from the United States. Due to the extremely noxious character of the species and the possible relationship of Spanish plants with the invasive American populations, some kind of monitoring is recommended.Rhaponticum repens (Compositae), una nueva planta alóctona para la Península Ibérica.- Se cita por primera vez la especie Rhaponticum repens para la flora de la Península Ibérica. Rhaponticum repens es una especie nativa de Asia central que actúa como invasora en diversos países como Argentina, Canadá o los Estados Unidos. Se ha encontrado por primera vez en campos de cultivo abandonados en el pueblo de Vilablareix, cerca de la ciudad de Girona (Cataluña, España) y en el valle del Vinalopó (Valencia, España), donde fue recolectada y mal identificada en 1959. Los datos moleculares, obtenidos a partir de la región ITS del nrDNA, sugieren que estas poblaciones podrían estar relacionadas con plantas invasoras de Estados Unidos. Debido al carácter extremadamente invasor de la especie, y a su posible origen secundario a partir de las poblaciones norteamericanas, se recomienda el seguimiento de estas poblacione
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