Experiences with starfield visualizations for analysis of library collections

This paper presents a qualitative and formative study of the uses of a starfield-based visualization interface for analysis of library collections. The evaluation process has produced feedback that suggests ways to significantly improve starfield interfaces and the interaction process to improve their learnability and usability. The study also gave us clear indication of additional potential uses of starfield visualizations that can be exploited by further functionality and interface development. We report on resulting implications for the design and use of starfield visualizations that will impact their graphical interface features, their use for managing data quality and their potential for various forms of visual data mining. Although the current implementation and analysis focuses on the collection of a physical library, the most important contributions of our work will be in digital libraries, in which volume, complexity and dynamism of collections are increasing dramatically and tools are needed for visualization and analysis

Evaluation of the individual phenolic compounds of regional cultivars of pears (Pyrus communis L.) by Liquid Chromatography combined with High Resolution Mass Spectrometry

Pear (Pyrus communis L.) is a fruit of great interest because their consumption offers nutritional as well as medicinal advantages [1]. The most well-known and studied properties associated with pears are antioxidant and anti-inflammatory properties [2] these are associated with the presence of phenolic compounds, mainly in the peels but also, in smaller amounts, in its mesocarp (pulp) [3]. In this work, an Ultra-High Performance Liquid Chromatography combined with Time-of-Flight Mass Spectrometry (UHPLC-ToF-MS) method was optimized and validated for the determination of individual phenolics in the pulp and by-products of fruits. The main phenolic compounds found in the studied regional pear cultivars (6 cultivars from Alcobaça region) were catechin, epicatechin, caffeic acid, chlorogenic acid, and vanillic acid. The pear by-products (peels and seeds) presented higher phenolic content than mesocarp, mainly peels samples. One example of this is the Carapinheira Roxa cultivar, wherein the peels had the highest concentration of chlorogenic acid (26.26 ± 0.65 g/g) and lower levels were found in the seeds (3.11 ± 0.19 g/g) and in the pulp (4.27 ± 0.03 g/g). Other very well recognized pear phenolics, were quantified in all the pear cultivars, at different levels. For example, in the peels portion, the level of epicatechin varied between 0.19 g/g in the Torres Novas cultivar and 37.30 g/g in the Lambe-os-Dedos cultivar. The studied regional pear cultivars, in particular their by-products, presented high levels of phenolic compounds, showing potential to be valorized.This study was carried out in the frame of the clabel+ project: Innovative Natural, Nutritious and Consumer Oriented “Clean Label” Foods with the reference POCI-01-0247-FEDER-046080 financed by the Competitiveness and Internationalization Thematic Operational Programme (POCI), under the COMPETE2020, PORTUGAL2020 Partnership Agreement, through the co-financing of European Regional Development Fund (FEDER). The work was supported by UIDB/00211/2020 with funding from FCT/MCTES through national funds. J. D.T. would like to thank to clabel+ project for his fellowship (28/2021/BI). The authors thank Patricia Vicente for her support in the field work. C. Almeida also acknowledges the financial support by LA/P/0045/2020 (ALiCE), UIDB/00511/2020 and UIDP/00511/2020 (LEPABE), funded by national funds through FCT/MCTES (PIDDAC).info:eu-repo/semantics/publishedVersio

Social movements and international law: progress and challenges

Objetivo. El siguiente escrito se propone reunir un conjunto de entradas teóricas del derecho internacional alternativas a las entradas dominantes centradas en la participación de los Estados y organizaciones internacionales en la construcción de normas internacionales. Metodología. Con base en el análisis documental se examina la clave en que se ha desarrollado la relación entre el derecho internacional y los movimientos sociales. Resultado. Como resultado se obtuvo un marco general para entender en qué términos se ha explorado dicha relación. Conclusión. Se concluye con los avances que se han gestado en esta relación, y con los retos mayores para la academia con miras a la construcción de un marco teórico del derecho internacional de los movimientos sociales.Objective. The purpose of this article is to gather a set of theoretical entries of international law alternative to the dominant entries, which are focused only on the participation of States and international organizations in the building of international standards. Methodology. Based on a documentary analysis, the pattern in which the relationship between international law and social movements has taken place is examined. Results. As a result, a general framework to understand in which terms that relationship has been explored was obtained. Conclusions. It concludes with the advances that have been developed in this relationship, and with the major challenges for the academy in order to construct a theoretical framework of the international law of social movements

SABER PEDAGÓGICO EN EVALUACIÓN DEL PROFESORADO DE ESCUELAS VULNERABLES DE LA COMUNA DE ARICA Y SUS DEMANDAS A LA FORMACIÓN INICIAL DOCENTE

Esta investigación tuvo como objetivo analizar las prácticas pedagógicas en evaluación del profesorado que se desempeña en contextos escolares vulnerables, identificando las demandas que, desde su experiencia profesional docente, realizan a la formación inicial. El estudio de carácter cualitativo, ha utilizado como técnica de recogida de la información, la entrevista semi estructurada y el grupo de discusión, y fue realizado en escuelas de alto índice de vulnerabilidad de la comuna de Arica-Chile, durante el primer semestre de 2018. Los resultados muestran que el profesorado utiliza estrategias evaluativas que promueven el diálogo, la reflexión grupal y la capacidad crítica del estudiantado, mediante procedimientos que incentivan la autoevaluación, la coevaluación y la metacognición de estos, estrategias que son complementadas con la formulación de preguntas abiertas, la explicitación de altas expectativas sobre el rendimiento del alumnado y la utilización de recursos afectivos en su acción evaluativa

Memory management unit for hardware-assisted dynamic relocation in on-board satellite systems

Satellite on-board systems spend their lives in hostile environments, where radiation can cause critical hardware failures. One of the most radiation-sensitive elements is memory. The so-called single event effects (SEEs) can corrupt or even irretrievably damage the cells that store the data and program instructions. When one of these cells is corrupted, the program must not use it again during execution. In order to avoid rebuilding and uploading the code, a memory management unit can be used to transparently relocate the program to an error-free memory region. This article presents the design and implementation of a memory management unit that allows the dynamic relocation of on-board software. This unit provides a hardware mechanism that allows the automatic relocation of sections of code or data at run-time, only requiring software intervention for initialization and configuration. The unit has been implemented on the LEON architecture, a reference for the European Space Agency (ESA) missions. The proposed solution has been validated using the boot and application software (ASW) of the instrument control unit of the Energetic Particle Detector of the Solar Orbiter Mission as a base. Processor synthesis on different FPGAs has shown resource usage and power consumption similar to that of a conventional memory management unit. The results vary between ± 1?15% in resource usage and ± 1?7% in power consumption, depending on the number of inputs assigned to the unit and the FPGA used. When comparing performance, both the proposed and conventional memory management units show the same results.Universidad de Alcal

Crisis y reestructuración de grandes zonas regables en Andalucía: el caso del bajo Guadalquivir

Este trabajo pretende analizar las características actuales de la Zona Regable del Bajo Guadalquivir, así como la percepción y respuestas de los diferentes actores ante las nuevas dinámicas socioeconómicas y modificaciones normativas (DMA y última revisión de la PAC). En primer lugar, se realizó un diagnóstico socio-económico de la agricultura y el espacio rural de un área seleccionada (Municipios de Los Palacios, Las Cabezas de San Juan y Lebrija). A continuación se identificaron los agentes socio-institucionales con implicaciones en la agricultura de este entorno y se realizaron 23 entrevistas. Este trabajo se completó con la aplicación de una encuesta a 156 agricultores

A review of the different boiler efficiency calculation and modeling methodologies

A review of the different mathematical methodologies for calculating energy efficiency in boilers was carried out in this work, considering both the methods included in standards and the proposals and applications published in research works. The classification was delimited in analytical methods, mechanistic modeling, and empirical modeling; moreover, the main equations for each of the methodologies are presented, which allows building a compilation that is expected to be useful for a first approach to the subject. It is displayed that those mechanistic models are used to evaluate subsystems or specific cases that require a high level of detail, while analytical models are used to make a first approximation to the systems described, and empirical models stand out in terms of their use at the industrial level if there is access to a starting database to adjust them.En el presente trabajo se realizó una revisión de las diferentes metodologías matemáticas de cálculo de eficiencia energética en calderas, considerando tanto los métodos incluidos en normas como las diferentes propuestas y aplicaciones publicadas en trabajos investigativos. Se delimitó la clasificación en métodos analíticos, modelados mecanicistas y modelados empíricos. Se exponen las principales ecuaciones para cada una de las metodologías, lo que permite construir una compilación, que se espera que sea de utilidad para una primera aproximación a la temática. Se evidencia que los modelos mecanicistas se emplean para evaluar subsistemas o casos puntuales que requieren alto nivel de detalle, mientras que los modelos analíticos se emplean para realizar una primera aproximación a los sistemas descritos, y los modelos empíricos destacan en cuanto al uso a nivel industrial, siempre y cuando se tenga acceso a una base de datos de partida para ajustarlos