Una clasificación de libros de cálculo basada en los programas de curso

Presentamos los resultados de un trabajo realizado dentro de un proyecto de investigación sobre factores que obstaculizan la permanencia, logro educativo y eficiencia terminal en la Facultad de Matemáticas de la Universidad Autónoma de Yucatán. El objetivo consistió en identificar las relaciones entre libros y programas de Cálculo que se utilizan en los dos primeros semestres de las licenciaturas que ofrece la facultad. La metodología seguida es de corte cualitativo, basada en el análisis de objetivos y contenido de los programas; así como en los enfoques de los libros, para identificar la relación existente entre dichos elementos. Como resultados, se presenta una clasificación de libros para los cursos de Cálculo y se valida la influencia, en los programas de Cálculo, de los libros utilizados con mayor frecuencia por los profesores

CROFT, Catherin y MACDONALD, Susan (eds.). (2018). Concrete. Case Studies in Conservation Practice. Los Ángeles: The Getty Conservation Institute.

El hormigón es, sin duda, el material simbólico de la arquitectura moderna, paralelo a su desarrollo y determinador de su progreso. A pesar de los avances conseguidos en los últimos años en torno su conservación, siguen presentándose carencias importantes que urgen ser resueltas, carencias ante las cuales el Instituto de Conservación de la Fundación Getty puso en marcha en 2011 la Iniciativa por la Conservación de la Arquitectura Moderna, propuesta basada en el diálogo entre profesionales de diferentes ámbitos. Fruto de esta iniciativa surge Concrete: Case Studies in Conservation Practice (2018), libro inaugural de la serie Conserving Modern Heritage, cuyas páginas han querido desplegarse a modo de puente sobre los vacíos de la cuestión, manual que rehuye de soluciones genéricas y apuesta por la generación del conocimiento desde la experiencia

A Comprehensive Study of Dog Bites in Spain, 1995-2004

Dog bites in humans are a complex problem embracing public health and animal welfare. To prevent dog bites it is necessary to have comprehensive epidemiological data that allow the identification of associated risk patterns. This study was aimed at investigating the problem posed by dog bites in Spain. The epidemiology of medically attended dog bite-related incidents reported in Aragón was analysed from 1995 to 2004. Bite incidents were mostly associated with: (1) low-population areas (71.3/100,000 inhabitants); (2) males and children, particularly those aged 5–9; (3) single injuries directed to the head and neck area in children and to the extremities in adults; (4) young, male, medium to large, owned dogs that were known to the victim; (5) summer months, and (6) specific circumstances such as human interference with knocked down and fighting dogs. In the light of these risk patterns, a wide range of specific preventive measures could be proposed

Effect of a Ketogenic medium chain Triglyceride-enriched diet on the fecal microbiota in canine idiopathic epilepsy: a pilot study

Ketogenic diets have been successfully used in people and dogs with idiopathic epilepsy. This study examined the effect of a ketogenic medium chain triglycerides (MCT)- enriched diet administered for one month on the fecal microbiota of epileptic (n = 11) (six with drug-sensitive epilepsy, DSE; five with drug-refractory epilepsy, DRE) and non-epileptic beagle dogs (n = 12). A significant reduction after diet in the relative abundance of bacteria from the Actinobacteria phylum was observed in all dogs. Epileptic dogs showed a higher relative abundance of Lactobacillus compared with non-epileptic dogs at baseline but these differences disappeared after diet. Epileptic dogs also showed a significantly higher abundance of Negativicutes and Selenomonadales after dietary intervention. Baseline microbiota patterns were similar in non-epileptic beagles and dogs with DSE but significantly different from dogs with DRE. In non-epileptic and DSE groups, the MCT diet decreased the relative abundance of Firmicutes and increased that of Bacteroidetes and Fusobacteria, but the opposite effect was observed in dogs with DRE. These results suggest that the MCT diet effect would depend on individual baseline microbiota patterns and that ketogenic diets could help reduce gut microbiota differences between dogs with DRE and DSE

Detection and study of a high magnitude seismic event from GPS data: Case study of the 2011 Tohoku-Oki earthquake

The advent of GPS provided a new way of measuring surface displacements due to earthquakes by deploying GPS networks within active seismic areas. Japan is located in the confluence of several tectonic plates, hence its seismicity. In order to surveille this activity, one of wider GPS network in the world was deployed, i.e., GEONET. By processing data from 93 GEONET reference stations, we analyze the 2011 Tohoku-Oki earthquake using PPP strategy. We stu- died the time series during the event setting up a threshold value at we consider the time series are being altered by the earthquake. We also identified the time after the occurrence when the maximum displacements happen. With the study of these two parameters, we aim to show their different behavior as the main shock propagates along the Japan islands, with a focus on a better understanding of the earthquake and its propagation. To achieving this, a least square adjustment method was used to relate epicentral distance to topocentric displacements and the time of detection to epicentral distance. The results show an exponential behavior of the distance-displacement regression versus a linear behavior of the distance-time regression. Besides, we use the former linear regression to calculate and approximation of the velocity of the shock wave

Baseline and postprandial concentrations of cortisol and ghrelin in companion dogs with chronic stress-related behavioural problems: A preliminary study

Ghrelin has been proposed as an essential element regulating the stress response in both humans and rodents. The aim of this work was to study the relation between cortisol and ghrelin in companion dogs showing chronic stress-related behaviour problems and the effect of the administration of high energy palatable food on these hormones. Baseline and post-prandial serum concentrations of both hormones were analyzed in a group of stressed companion dogs (n¿=¿16) showing social conflict-related aggression (SCA, n¿=¿10) or separation anxiety (SA, n¿=¿6), and in a group of non-stressed control companion dogs (n¿=¿16). Significant differences (p¿<¿0.05) between groups emerged for post-prandial levels, with SCA dogs showing higher cortisol than the control group. The change in cortisol levels (%) after eating in this group was positive, differing from the SA and control groups, which decreased their cortisol after food consumption. Ghrelin also decreased significantly in SA dogs after eating. Taking together, these findings suggest that a parallel meal-induced decrease in both cortisol and ghrelin occurred in the SA group, but not in the SCA group, pointing towards a failure to suppress ghrelin (and cortisol) after intake in the latter. Thus, even though SCA and SA were considered chronic stress-related behaviour problems, their different nature may affect animals in their stress response to the administration of palatable food. The possible alleviatory effect of food consumption, particularly “comfort foods”, after the owner is back home in SA dogs, as well as the changes in dogs’ eating behaviour in response to emotional states or stress (“emotional eating”) will require further studies

The time lag between deformation process and seismic activity in El Hierro Island during the eruptive process (2011-2014): a functional phased approach

On 10 October 2011, a submarine eruption occurred in El Hierro island. Thus, the eruptive process in the Canary islands was reactivated after 40 years of inactivity. The main objective of this work is to evaluate, using Functional Data Analysis, how the surface deformation phenomenon explains the seismic-volcanic activity in the island. The GNSS-GPS data are from the FRON (GRAFCAN) station, located in Frontera. These data measure, each 4 h, the distance between the FRON station and the reference station LPAL (La Palma island) from August, 2010 to December, 2013. In this study a functional correlation measure is employed to establish the relation between the deformation curve and the curve of cumulative energy released. The period of time analysed has been divided into four phases to avoid the mix of phenomena. For each phase, the correlation measure and the time lag between deformation curve and the curve of cumulative energy released have been estimated. These values show a strong relation between these curves. With respect to time lag period, the only significant lag, of about 1 month, occurred in Phase 1, which was after a long period without seismic activity. The later phases had very short, insignificant, lags. After a long period without seismic and volcanic activity in El Hierro island, the time lag between the deformation process and the beginning of the seismic activity takes approximately 1 month. In a similar situation a method to predict in real time the beginning of the seismic activity is proposed. This method, based on the changes produced in the derivative curves when there is a rapid descent in the deformation curve, could activate a warning system approximately 13 days before the beginning of seismicity

Tratamiento con nicergolina de dos casos de disfunción cognitiva en perros geriátricos

Dos perros con signos de disfunción cognitiva fueron tratados con nicergolina. El objetivo era poder mejorar el aporte sanguíneo al cerebro y retrasar los efectos propios del síndrome. En ambos casos se observó una mejora ostensible de su conducta. La nicergolina puede se útil en el tratamiento sintomático del síndrome.

Analysis of a GPS network based on Functional Data Analysis

This work demonstrates the usefulness of approaching the dynamic study of the precise positioning of a network of GPS (Global Positioning Sys- tem) permanent stations through the Functional Data Analysis (FDA). The displacement data for each GPS station, obtained from observations of Global Navigation Satellite System, are a discrete sample of the positioning curve. The aim of this work is the reconstruction of the original functions in order to use it as functional data. In the methodology presented in this work, the geodetic series are obtained first by processing the GPS data with respect to a reference station. Second, for each station, a cleaning process is applied to eliminate the values considered as outliers and the missing values are imputed by using Kalman filter. Finally, the original functions are reconstructed by using smoothing techniques and by evaluating several bases of functions. Moreover, these funcions are treated with statistical techniques for functional data. This procedure is applied to the permanent stations of SPINA network (South of the Iberian Peninsula and North of Africa). We analyze the topocen- tric series: East, North and Up. In the analysis of the positioning curves it is observed a synchronized behaviour of the functions in the periods of time with an important seismic activity. This behaviour also appears in the analysis of the second principal component of East and Up dimensions. Furthermore, the first two principal components of East coordinate enable us to make a classifi- cation of the stations in SPINA network. The classification made is consistent with the previous knowledge of the tectonic plates in the studied area

Treatment and Analysis of Multiparametric Time Series from a Seismogeodetic System for Tectonic Monitoring of the Gulf of Cadiz, Spain †

The tectonic activity produced by the interaction between the Eurasian and African plates continually generates high seismic activity and the possibility of tsunamis occurring in the Gulf of Cadiz, Spain. The occurrence of these phenomena and the associated threat implies the need to implement a seismogeodesic system made up of a GNSS receiver, a seismograph–accelerograph, and an inclinometer that allows for us to study the behavior of tectonic activity in the Gulf and adjacent areas. This system is installed in the Doñana biological station, Huelva, Spain, and sends continuous records to the control center located in the University of Cadiz, generating GNSS, seismic, accelerometric, and inclinometric time series, which, together with the implementation of geodetic and geophysical techniques, is capable of providing information on tectonic activity immediately. In this manuscript, the time series generated by the system have been analyzed, in addition to a specific seismic event that occurred in the study area