Phytoplankton Size Structure in Association with Mesoscale Eddies off Central-Southern Chile: The Satellite Application of a Phytoplankton Size-Class Model

Understanding the influence of mesoscale and submesoscale features on the structure of phytoplankton is a key aspect in the assessment of their influence on marine biogeochemical cycling and cross-shore exchanges of plankton in Eastern Boundary Current Systems (EBCS). In this study, the spatio-temporal evolution of phytoplankton size classes (PSC) in surface waters associated with mesoscale eddies in the EBCS off central-southern Chile was analyzed. Chlorophyll-a (Chl-a) size-fractionated filtration (SFF) data from in situ samplings in coastal and coastal transition waters were used to tune a three-component (micro-, nano-, and pico-phytoplankton) model, which was then applied to total Chl-a satellite data (ESA OC-CCI product) in order to retrieve the Chl-a concentration of each PSC. A sea surface, height-based eddy-tracking algorithm was used to identify and track one cyclonic (sC) and three anticyclonic (ssAC1, ssAC2, sAC) mesoscale eddies between January 2014 and October 2015. Satellite estimates of PSC and in situ SFF Chl-a data were highly correlated (0.64 < r < 0.87), although uncertainty values for the microplankton fraction were moderate to high (50 to 100% depending on the metric used). The largest changes in size structure took place during the early life of eddies (~2 months), and no major differences in PSC between eddy center and periphery were found. The contribution of the microplankton fraction was ~50% (~30%) in sC and ssAC1 (ssAC2 and sAC) eddies when they were located close to the coast, while nanoplankton was dominant (~60–70%) and picoplankton almost constant (<20%) throughout the lifetime of eddies. These results suggest that the three-component model, which has been mostly applied in oceanic waters, is also applicable to highly productive coastal upwelling systems. Additionally, the PSC changes within mesoscale eddies obtained by this satellite approach are in agreement with results on phytoplankton size distribution in mesoscale and submesoscale features in this region, and are most likely triggered by variations in nutrient concentrations and/or ratios during the eddies’ lifetimes

Asturiux: detection system of computational anomalies

Everyday in network management, it is complex the process to correlate events in different dimensions: legal violation, intrusions, monitoring failures, violation to security policies or breach of standards; to which face professionals, teaching and students in this area in Colombia. This article presents the technological aspects for the design and development of a distributed system for the computational anomalies detection that was termed “Asturiux”, which arises as a product from a research project in the teleinformatics area. To addressing this problematic it use the network security administration, and anomalies detection. The system was fully developed with free software, in which were integrated different technologies for the communication, authentication, persistence, computational intelligence and remote alerts. The verification instruments and the realized tests, reflect a high level of system efficiency, and acceptation from the actors involved

Un escenario para la enseñanza en línea: Experiencias CEDEDUIS 2002-2005

RESUMENLa aplicación de las Tecnologías de la Información y de la Comunicación - TICs en los procesos de enseñanza y aprendizaje en educación superior se ha extendido en los últimos tiempos, situación que se presenta por los avances en los desarrollos tecnológicos y el crecimiento acelerado del conocimiento en las distintas disciplinas. Particularmente, en la Universidad Industrial de Santander se desarrollan diferentes experiencias de uso de las TICs en los procesos formativos de los programas presenciales y a distancia. Algunas de las experiencias son las acompañadas y desarrolladas desde el CEDEDUIS, que tienen relación con la capacitación de los docentes en el uso de las TICs para apoyar la enseñanza, el apoyo al montaje y desarrollo de experiencias en línea en cursos presenciales y a distancia, y el montaje de cursos en línea de perfeccionamiento docente. El artículo presenta el proceso de investigación realizado sobre estas experiencias, que permitió obtener algunas conclusiones en relación con las ventajas y dificultades en su implementación en programas de educación superior, así como la definición de lineamientos para asumir con calidad la mediación de procesos de enseñanza en línea de manera que se logren aprendizajes colaborativos y significativos. Palabras clave: Tecnologías de la información y la comunicación, enseñanza y aprendizaje en línea, aprendizaje significativo, aprendizaje colaborativo. SUMMARYThe application of Technologies of Information and Communication - TICs in learning and teaching processes for superior education has extended lately. This situation arises due to the advances in technological developments and the accelerated growth of knowledge in all disciplines. Particularly in the Universidad Industrial de Santander, different experiences on the uses of TICs are being developed in both classroom and distance learning programs. Some of these experiences are accompanied and developed by the CEDEDUIS, which have included faculty training in the use of TICs to support the learning process, the support of the assembly and development of online experiences in distance learning and classroom courses, and the assembly of courses in the line of teaching refinement. The paper presents the research done on these experiences, which resulted in some conclusions regarding the advantages and difficulties of their implementation in higher education programs. As well as the definition of guidelines to assume the high quality mediation of online teaching processes in such a way that meaningful and collaborative learning can be achieved. Keywords: Technologies of information and Communication, online teaching and learning, significant learning, collaborative learning

Prototype Drop Tests of Cube and Cubipod Armor Units

In this paper, an experimental methodology is described to assess the structural strength of unreinforced concrete armor units (CAUs). The methodology is applied to measure the structural integrity under impact loads of the new Cubipod CAU compared with the conventional cube CAU. The casting systems and clamps are described for manufacturing and handling the 15-t conventional cubic block and 16-t Cubipod prototypes used for the drop tests. Two separate reinforced concrete platforms were used for overturning and for free-fall tests, respectively. Compared with conventional cubes of similar size and concrete strength, Cubipods withstand drops that are more than 50% higher. Two extreme free-fall tests confirmed the structural robustness of Cubipod armor units. Manufacturing cycle time, as well as storage and handling procedures, are similar for both Cubipods and conventional cubic blocks. © 2011 American Society of Civil Engineers.The writers are grateful for the logistic support provided by the Port Authority of Alicante and the consortium TMS. Financial support was received from CDTI (CUBIPOD Project). The writers also thank Roman Goumy for his assistance during the prototype drop tests and Debra Westall for revising the manuscript.Medina, JR.; Gómez-Martín, ME.; Corredor-Molguero, A.; Torres-Samper, R.; Miñana, JV.; Fernández, E.; Menéndez, CF.... (2011). Prototype Drop Tests of Cube and Cubipod Armor Units. Journal of Waterway, Port, Coastal, and Ocean Engineering. 137(2):54-63. doi:10.1061/(ASCE)WW.1943-5460.0000064S5463137

Degradación autolítica de la plasmina e isoformas de 5 plasminogenos animales. (Humano, Bovino, Equino, Canino, Ovino de Pelo).

La principal proteína del sistema fibrinolítico es el plasminógeno, cuyas isoformas nunca han sido analizadas en 2D-PAGE. En este trabajo se han purificado los plasminógenos de cinco especies animales por cromatografía de afinidad (sefarosa- Lisina) caracterizándose posteriormente por electroforesis. En el análisis SDS-PAGE, se ha encontrado una gran similitud en cuanto a la degradación proteolítica del plasminógeno de las cinco especies, no obstante se observa variación en cuanto a las isoformas presentes en los plasminógenos de cada especie por medio del análisis en electroforesis bidimensional

Tuning strategy for Curie-temperature enhancement in the van der Waals magnet Mn_1+xSb_2−xTe₄

The van-der-Waals antiferromagnetic topological insulator MnBi2Te4 is one of the few materials that realize the sought-after quantum anomalous Hall (QAH) state and quantized surface charge transport. To assess the relevance of its isostructural analog MnSb2Te4 as a potential QAH candidate, the roles of Mn/Sb site mixing and cationic vacancies need to be clarified. Recent findings have shown that non-stoichiometry in Mn1±xSb2∓xTe4 is an efficient tuning knob to achieve a net spin-polarized state and to raise the magnetic ordering temperature well above that of MnBi2Te4. Here, we report the crystal structure, the bulk and the surface magnetism of two new Mn1+xSb2−xTe4 samples: Mn1.08Sb1.92Te4(x ≈ 0.1) with TC = 44 K, and Mn2.01Sb1.19Te4(x ≈ 1.0) with the record TC = 58 K. We quantify the site mixing comprehensively by combining various structural probes on powders and single crystals, and then employ bulk, local (electron spin resonance), and spectroscopic (x-ray magnetic circular dichroism) probes to connect these insights to the magnetism of these materials. We demonstrate that Mn over-stoichiometry up to x = 1.0, in combination with a particular Mn/Sb intermixing pattern and the increasingly three-dimensional character of the magnetic order, push the TC upwards. The tendency towards more robust ferromagnetism mediated by stronger interlayer exchange in Mn1+xSb2−xTe4 upon increasing x is confirmed by bulk magnetometry and by a series of density-functional-theory calculations of model structures with varying intermixing.</p

Structural assessment based on vibration measurement test combined with an artificial neural network for the steel truss bridge

Damage assessment is one of the most crucial issues for bridge engineers during the operational and maintenance phase, especially for existing steel bridges. Among several methodologies, the vibration measurement test is a typical approach, in which the natural frequency variation of the structure is monitored to detect the existence of damage. However, locating and quantifying the damage is still a big challenge for this method, due to the required human resources and logistics involved. In this regard, an artificial intelligence (AI)-based approach seems to be a potential way of overcoming such obstacles. This study deployed a comprehensive campaign to determine all the dynamic parameters of a predamaged steel truss bridge structure. Based on the results for mode shape, natural frequency, and damping ratio, a finite element model (FEM) was created and updated. The artificial intelligence network’s input data from the damage cases were then analysed and evaluated. The trained artificial neural network model was curated and evaluated to confirm the approach’s feasibility. During the actual operational stage of the steel truss bridge, this damage assessment system showed good performance, in terms of monitoring the structural behaviour of the bridge under some unexpected accidents.This research was funded by FCT/MCTES through national funds (PIDDAC) from the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under the reference UIDB/04029/2020, and from the Associate Laboratory Advanced Production and Intelligent Systems ARISE, under the reference LA/P/0112/2020, as well as financial support of the project research “B2022-GHA-03” from the Ministry of Education and Training. And The APC was funded by ANI (“Agência Nacional de Inovação”) through the financial support given to the R&D Project “GOA Bridge Management System—Bridge Intelligence”, with reference POCI-01-0247-FEDER069642, which was cofinanced by the European Regional Development Fund (FEDER) through the Operational Competitiveness and Internationalisation Program (POCI)

LA EVALUACIÓN: UN TEMA QUE TODOS DEBEMOS ABORDAR

RESUMEN La evaluación es un tema que debe ser abordado permanentemente por todos los miembros de la comunidad académica y especialmente por los profesores y estudiantes. Por las implicaciones éticas y de poder que llevan implícitas las acciones evaluativas, deben conformarse colectivos de pensamiento que mediante la reflexión crítica propicien las innovaciones acordes con las necesidades y exigencias sociales. Con la evaluación está asociada la calidad de la enseñanza, del aprendizaje, la calidad de vida en la comunidad académica y de la formación integral en general, por ello es imprescindible que se trasciendan las viejas e ineficaces políticas y prácticas, en favor de tendencias equilibradas y sobre todo democráticas.   Palabras Clave: Evaluación educativa, calidad, evaluación diagnóstica, evaluación formativa, y evaluación sumativa, acción comunicativa y criterios.   SUMMARY The evaluation is a subject that must permanently be boarded by all the members of the academic community and specially by the professors and students. By the ethical implications and of power that take implicit the evaluativas actions, they must be satisfied collective of thought that by means of the critical reflection the agreed innovations with the necessities and social exigencies cause. With the evaluation they are associate the quality of education, of the learning, the quality of life in the academic community and the integral formation in general, for that reason it is essential that the old and ineffective policies and practices are extended, in tendencies please balanced and mainly democratic.   Keywords: Educative evaluation, quality, it diagnoses evaluation, formative evaluation, and sum evaluation, communicative action and criteria.