Producción de manzana (Malus domestica Borkh) para mesa en el oriente de Puebla, México

La manzana se ha cultivado en el estado de Puebla, México, desde la época virreinal, aunque el sistema de producción no se ha modernizado y la rentabilidad es muy baj

Crystallization Process and Microstructural Evolution of Melt Spun Al-RE-Ni-(Cu) Ribbons

The crystallization process, both at the initial and subsequent stages, of amorphous Al88-RE4-Ni8 alloys (RE = Y, Sm and Ce) has been studied. Additionally, the consequences of adding 1 at.% Cu replacing Ni or Al were studied. The stability of the amorphous structure in melt spun ribbons was thermally studied by di erential scanning calorimetry, with Ce alloys being the most stable. The e ect of Cu to reduce the nanocrystal size during primary crystallization was analyzed by transmission electron microscopy. This latter technique and x-ray di raction showed the formation of intermetallic phases at higher temperatures. A clear di erence was observed for the Ce alloy, with a simpler sequence involving the presence of Al3Ni and Al11Ce3. However, for the Y and Sm alloys, a more complex evolution involving metastable ternary phases before Al19RE5Ni3 appears, takes place. The shape of the intermetallics changes from equiaxial in the Ce alloys to elongate for Y and Sm, with longer particles for Sm and, in general, when Cu is added to the alloy.Ministerio de Economía y CompetitividadUnión Europea DPI2015-69550-C2-2-P

Superposición entre las citas del Web of Science y Scopus: un estudio exploratorio

An exploratory study of the coverage overlapping between the Web of Science and Scopus and its implications for authors, researchers and libraries is presented, which was carried out inthe library of the Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas of the Universidad Autónoma de México for their researchers’ citations for the period 2011-12.Se presenta un estudio exploratorio de la superposición de citas entre el Web of Science y Scopus y sus implicaciones para los autores, los investigadores y las bibliotecas, realizado en la Biblioteca del Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas de la Universidad Autónoma de México sobre las citas recibidas por las publicaciones de sus investigadores para los años 2011-12

Reverse Engineering Feature Models with Evolutionary Algorithms: An Exploratory Study

Successful software evolves, more and more commonly, from a single system to a set of system variants tailored to meet the similiar and yet di erent functionality required by the distinct clients and users. Software Product Line Engineering (SPLE) is a software development paradigm that has proven e ective for coping with this scenario. At the core of SPLE is variability modeling which employs Feature Models (FMs) as the de facto standard to represent the combinations of features that distinguish the systems variants. Reverse engineering FMs consist in constructing a feature model from a set of products descriptions. This research area is becoming increasingly active within the SPLE community, where the problem has been addressed with di erent perspectives and approaches ranging from analysis of con guration scripts, use of propositional logic or natural language techniques, to ad hoc algorithms. In this paper, we explore the feasibility of using Evolutionary Algorithms (EAs) to synthesize FMs from the feature sets that describe the system variants. We analyzed 59 representative case studies of di erent characteristics and complexity. Our exploratory study found that FMs that denote proper supersets of the desired feature sets can be obtained with a small number of generations. However, reducing the di erences between these two sets with an e ective and scalable tness function remains an open question.We believe that this work is a rst step towards leveraging the extensive wealth of Search-Based Software Engineering techniques to address this and other variability management challenges.CICYT TIN2009- 07366Junta de Andalucía TIC-590

A brief review of reactive gases observations at Izaña Atmospheric Observatory (2006-2009)

Comunicación presentada en: Symposium on Atmospheric Chemistry and Physics at Mountain Sites celebrado del 8 al 10 de junio de 2010 en Interlaken, Suiza

Asociación Aeroespacial Cosmos: educational impact and returns of a three-year-old student aerospace association

Cosmos Aerospace Association is a leading engineering students’ group, located in the Universidad Rey Juan Carlos (URJC) in Madrid, Spain. Providing a one-of-a-kind opportunity to all varieties of students for both personal and engineering growth, it is one of the few active aerospace student associations in Spain. Within this work, we introduce the achievements, influence and lessons learned from our association in these years. We focus on its educational impact in the environment of the university: not only from the perspective of aerospace-related degrees but also in the promotion of STEM careers on students of all ages. Conceived by undergraduate aerospace students and supported by professors and university staff, Cosmos was born to provide a creative and learning environment in the promotion of our passion for space and science in general. Bringing together students with similar mindsets, it has become a symbiotic platform in which all university actors share their efforts and join forces to enhance the university experience both from a curricular and extracurricular perspective. The association is divided into three main areas: Administration and Legal, Construction, and Education. Each of these areas branch with Projects and smaller teams both transversal and vertically. Under the Construction branch, both aeromodelling, satellite and rocketry projects are found and developed. An autonomous VTOL vehicle and a solid combustion rocket are being designed with internal and external funding. Special mention goes to the design and construction of CosmoSat-1, our very first CubeSat mission, which is now starting to take off. The Education area involves the organization of cultural and educational activities, from coding seminars, hackathons to film forums or Women in STEM days, all of them transversal to the aerospace industry. In this regard, our most ambitious project to date has been SpaceCon URJC: a space-themed conference by and for university students, bringing together professionals from aerospace companies, space agencies, and research groups in a month-long virtual conference. Over a series of presentations and interviews, students can get a glimpse of a variety of possible careers in everything from satellite manufacturing, orbital mechanics, space debris, and everything in between. With an initial run in 2020, SpaceCon has been repeated in 2021 with great success. In short, COSMOS, while promoting a passionate interest for Space, has become a common meeting point for students and professors outside the fixed and fitted courses, where creativity can boom and grow

An assessment of search-based techniques for reverse engineering feature models

Successful software evolves from a single system by adding and changing functionality to keep up with users’ demands and to cater to their similar and different requirements. Nowadays it is a common practice to offer a system in many variants such as community, professional, or academic editions. Each variant provides different functionality described in terms of features. Software Product Line Engineering (SPLE) is an effective software development paradigm for this scenario. At the core of SPLE is variability modelling whose goal is to represent the combinations of features that distinguish the system variants using feature models, the de facto standard for such task. As SPLE practices are becoming more pervasive, reverse engineering feature models from the feature descriptions of each individual variant has become an active research subject. In this paper we evaluated, for this reverse engineering task, three standard search based techniques (evolutionary algorithms, hill climbing, and random search) with two objective functions on 74 SPLs. We compared their performance using precision and recall, and found a clear trade-off between these two metrics which we further reified into a third objective function based on Fβ, an information retrieval measure, that showed a clear performance improvement. We believe that this work sheds light on the great potential of search-based techniques for SPLE tasks.Ministerio de Economía y Competitividad TIN2012-32273Junta de Andalucía TIC-186

Elaboración de material docente virtual de apoyo a las prácticas de rocas del Grado de Biología

Una de las actividades prácticas de la asignatura de Geología del primer curso del Grado en Biología de la Universidad de Alicante son las prácticas de laboratorio. Estas prácticas se dedican básicamente al reconocimiento visual de rocas y fósiles. Tras varios años de experiencia en la impartición de esta asignatura, se ha comprobado que las principales debilidades de las prácticas de laboratorio se deben al escaso número de sesiones presenciales. A ello se le suma una cierta dificultad para poder realizar otras sesiones de repaso fuera del horario establecido. Ante esta situación el alumno tiene algunos problemas en el reconocimiento visual de los ejemplares, así como para poder preparar los controles y pruebas de evaluación. Con el objetivo de facilitar el autoaprendizaje en este campo, se ha diseñado una página web que incluye toda la colección de rocas de las sesiones prácticas, así como otros materiales complementarios, en la que se aporta la información básica de cada ejemplar. Inicialmente, la página se ha diseñado específicamente para las prácticas de reconocimiento de rocas, ya que son las que presentan menor duración presencial

High variability of dust composition in the Saharan Air Layer

Poster presentado en: EcoDesert International Symposium, celebrado en Almería (España) del 20 al 22 de febrero de 2019.Every year, 1500-2000 Tg of dust are emitted from soil to the atmosphere. The resulting aerosol dust particles have a size ranging from sub-1 μm to tens of microns, and a lifetime from hours to two weeks. Aerosol dust impacts on climate and on biogeochemical cycles, and is involved in the Earth System. About 50 to 70% of global dust emissions occur in North Africa. Most of dust exports to the Atlantic occur in the so-called Saharan Air Layer, a warm, dry and dusty high-altitude air stream that reaches the Americas. At the Izaña Observatory, 2400 m.a.s.l. in Tenerife (Spain), we studied (i) the variability of dust composition in the Saharan Air Layer, (ii) the North African sources and (iii) the large-scale meteorology prompting the variability observed. For this purpose, we performed (i) one-hour resolution sampling of aerosols, followed by (ii) PIXE (Particle bombing Induced X Ray Emission) analysis, and (iii) further data interpretation with meteorological tools and satellite observations. During one-week dust events, we found that the ratios of some elements (e.g. Ca, Mg or K, among others) to Al (soil tracer) changed by a factor of about 2 in a few (5-7) hours. This high variability in dust points to a concatenation of the sources contributing to dust over the North Atlantic. By back-trajectory analysis, Median Ratios At Receptor plots and MODIS and MSG – SEVIRI satellite observations, we observed that the sources activated during the study period were located in topographical lows located in three main regions: NE Algeria – Tunisia (dust rich in Ca, Sr, Mg and K), W Algeria-E Morocco (Na and Cl) and N Mali-S Algeria (rich in Si and Fe). In a six-day period, there were seven concatenated impacts from the sources identified, which were traced by the variability in the ratios of the different elements to Al. These results provide a new and more complex view of the dust exported to the Atlantic, compared to the simplistic approach based on bulk-dust measurements and modelling. These results have implications of the impact and influence of dust on climate

Rapid changes of dust geochemistry in the Saharan Air Layer linked to sources and meteorology

Based at Izaña Observatory (∼2400 m a.s.l. in Tenerife), we performed 1-h resolution measurements of elemental composition of dust in the Saharan Air Layer (SAL) and studied the variability of the ratios of these elements to aluminium (elemental ratios). In a period (∼1 week) of continuous dust presence (50–200 μg/m3), we observed rapid variations of dust composition; some elemental ratios changed by a factor 2 in a few (5–8) hours. The lowest variability (Normalized Variability Range, %) was found for Si/Al (9%) and Fe/Al (9%), followed by the ratios of K, Ti, Mg, Mn, Ca and Sr to Al (20–80%), and the highest for S/Al, Na/Al and Cl/Al (110–160%) and a number of trace metals (Cr, Cu, Ni, Zn, Zr) and Br (>200%). This variability was induced by the alternating impacts of three of the large North African dust sources: NE Algeria (rich in evaporite minerals bearing Ca, S, Sr, K and Mg and in illite mineral), Western Sahara to Bechar region (containing Na, S and Cl rich Yermosol soils) and SW Sahara – Western Sahel (rich in illite and hematite). We traced the variability in large-scale meteorology using the so-called North African Dipole Intensity (NAFDI: strength of the subtropical Saharan high -Morocco-to the monsoon tropical low -Nigeria-). The mobilization of dust from the different sources was associated with westward propagating Harmattan pulses linked to the change of phase of NAFDI (- to +), the associated westward shifts of the Saharan Heat Low and convective monsoon inflow. We found a correlation between dust composition in the SAL and NAFDI: moderate NAFDI values (0 to +2.5) were associated with Ca, K, Na, Mg and S rich dust linked to dust sources in NE Algeria, whereas higher NAFDI values (+2.5 to +4) were linked to Fe rich dust (Ca, Na and S depleted) linked to dust sources in SW Sahara – Western Sahel. The results of this study also show that some trace elements (Br, Cr, Ni, Zn and Zr) are influenced by industrial emissions into North Africa.This study was performed within the project VARDUST-SAL (PGC 2018-099166-B-I00), funded by the Ministry of Science, Research and Innovation of Spain, the Research State Agency of Spain and the European Regional Development Fund (ERDF)