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Landscape Transformations (1987–2022): Analyzing Spatial Changes Driven by Mining Activities in Ayapel, Colombia
No full textGold mining is an activity that has developed in Colombia due to the great
availability of mineral resources geographically distributed throughout the territory. The
extraction techniques used are linked to the domain of illegality and to armed actors who
have generated notable landscape impacts. This study, focused on the Municipality of
Ayapel, Colombia, identifies the landscape units and analyzes the changes in land use
and cover resulting from gold mining between the years 1987, 2002, and 2022, applying
the CORINE Land Cover methodology, an adapted legend for Colombia, using Landsat
satellite images. For this, the recognition of the physical geographical characteristics
of the area was carried out in order to group homogeneous landscape units through
a cartographic overlay of various layers of information, considering variables such as
topography, geomorphology, and lithology. This research identifies a total of 16 landscape
units, 8 of which were intervened in 1987, mainly associated with denudational hills.
However, in 2022, 13 landscape units were intervened, with a considerable increase in the
affected area. Particularly noteworthy is the occupation of landscape units associated with
alluvial valleys, with an average of more than 30% of their total area. This demonstrates that
they are the most attractive and vulnerable areas for mining exploitation, as they are the
zones with the greatest potential for hosting mineral deposits. This impact has worsened
over the last decade due to the introduction of other extraction techniques with machinery
(dredges, dragon boats, backhoes, and bulldozers) that generate higher productive and
economic yields but, at the same time, cause deep environmental liabilities due to the
lack of administrative controls. The changes in extraction techniques, the increase in the
international price of the commodity, and the absence of government attention have been
the breeding ground that has driven gold mining activity
Juggling Balls and Mathematics: An Ethnomathematical Exploration
No full textEthnomathematics, as a field of study, promotes recognizing the diversity in ways
of thinking and doing mathematics, challenging the hierarchies and exclusions typical of
traditional mathematics education. This research explores the practice of juggling, specifically
analyzing three-ball juggling sequences to uncover the mathematical structures and
patterns embedded in this ancient art form. In a social association during a workshop, two
jugglers and seven juggling learners interact with one of the researchers, a mathematics
educator, to co-construct a shared model establishing a symmetrical dialogue based on the
Alangui’s principles of “mutual interrogation” between the practice of juggling and the
domain of mathematics. The knowledge exchange process is envisioned as a “barter” where
both the mathematics educator and the jugglers contribute their unique perspectives to generate
new and hybrid understandings. With a qualitative approach, from the analysis of the
data collected during the ethnographic field work (notes, audiovisual recordings) emerges
how the initial model, created by mathematicians and jugglers, was reinterpreted to better
align with the cultural community’s practice. The research revealed that juggling serves
as a concrete context for exploring abstract mathematical concepts and that mathematical
analysis of juggling sequences helps jugglers gain a deeper understanding of underlying
structures, enhancing their creativity. The hybrid model developed in this study offers a
promising resource to integrating ethnomathematical perspectives into formal mathematics
education, fostering a more situated and engaging learning experience for students.Unidad de Excelencia
de Investigación del Campus Universitario de Melilla (UECUMel), reference code: UCE-PP2024-02Ministero dell’Istruzione e delMerito: grant number Com. Study n. 11467/Liceo Istituto Superiore I.I.S.S. “E.Majorana
Análisisis de Riesgos - Actividad 1.2
No full textEl objetivo de esta tarea es realizar un breve resumen del marco regulatorio Basilea III, abordando los siguientes aspectos clave:
- Antecedentes históricos y contexto de su creación.
- Utilidad y objetivos principales.
- Bases fundamentales del informe.
- Cuestiones destacadas y su impacto en el sistema financiero.The objective of this task is to provide a brief summary of the Basel III regulatory framework, addressing the following key aspects:
- Historical background and context of its creation.
- Utility and main objectives.
- Fundamental principles of the report.
- Key issues and their impact on the financial system
A moderated mediation model of despotic leadership and knowledge sabotage behavior
No full textOur paper develops and tests a moderated mediation model of despotic leadership (DL) and knowledge sabotage behavior (KSB). The model assesses: (a) the link between DL and KSB; (b) emotional dissonance as a mediator between DL and KSB; (c) willpower and waypower as the two moderators of the effect of DL on the aforesaid undesirable outcome; and (d) willpower and waypower as the two moderators of the effect of DL on KSB via emotional dissonance. To gauge these relationships, we used time-lagged data obtained from hotel frontline employees. Most of the hypothesized associations are supported, and the model we proposed is viable. Managers’ DL heightens employees’ KSBs, and emotional dissonance mediates this link. FLEs’ waypower reduces the detrimental effect of DL on KSB. Waypower also mitigates the deleterious effect of DL on the said outcome via emotional dissonance
Additive mappings preserving orthogonality between complex inner product spaces
No full textL. Li was supported by National Natural Science Foundation of China (Grant No. 12171251). A.M. Peralta supported by grant PID2021-122126NB-C31 funded by MICIU/AEI/10.13039/501100011033 and by ERDF/EU, by Junta de Andalucía grant FQM375, IMAG–María de Maeztu grant CEX2020-001105-M/AEI/10.13039/ 501100011033 and (MOST) Ministry of Science and Technology of China grant G2023125007L.Let H and K be two complex inner product spaces with
dim(H) ≥ 2. We prove that for each non-zero mapping
A : H → K with dense image the following statements are
equivalent:
(a) A is (complex) linear or conjugate-linear mapping and
there exists γ > 0 such that ‖A(x)‖ = γ‖x‖, for all x ∈ H,
that is, A is a positive scalar multiple of a linear or a
conjugate-linear isometry;
(b) There exists γ1 > 0 such that one of the next properties
holds for all x, y ∈ H:
(b.1) 〈A(x)|A(y)〉 = γ1〈x|y〉,
(b.2) 〈A(x)|A(y)〉 = γ1〈y|x〉;
(c) A is linear or conjugate-linear and preserves orthogonal-
ity;
(d) A is additive and preserves orthogonality in both direc-
tions;
(e) A is additive and preserves orthogonality.National Natural Science Foundation of China (12171251)MICIU/AEI/10.13039/501100011033 PID2021-122126NB-C31ERDF/EUJunta de Andalucía FQM375IMAG–María de Maeztu grant CEX2020-001105-M/AEI/10.13039/ 501100011033(MOST) Ministry of Science and Technology of China G2023125007
Semi-supervised constrained clustering: an in-depth overview, ranked taxonomy and future research directions
No full textThis study has been funded by the research projects PID2020-119478GB-I00, A-TIC-434-UGR20 and PREDOC_01648.
Universidad de Granada/CBUA.Clustering is a well-known unsupervised machine learning approach capable of automatically grouping discrete sets of instances with similar characteristics. Constrained clustering is a semi-supervised extension to this process that can be used when expert knowledge is available to indicate constraints that can be exploited. Well-known examples of such constraints are must-link (indicating that two instances belong to the same group) and cannot-link (two instances definitely do not belong together). The research area of constrained clustering has grown significantly over the years with a large variety of new algorithms and more advanced types of constraints being proposed. However, no unifying overview is available to easily understand the wide variety of available methods, constraints and benchmarks. To remedy this, this study presents in-detail the background of constrained clustering and provides a novel ranked taxonomy of the types of constraints that can be used in constrained clustering. In addition, it focuses on the instance-level pairwise constraints, and gives an overview of its applications and its historical context. Finally, it presents a statistical analysis covering 315 constrained clustering methods, categorizes them according to their features, and provides a ranking score indicating which methods have the most potential based on their popularity and validation quality. Finally, based upon this analysis, potential pitfalls and future research directions are provided.Universidad de Granada/CBUAPID2020-119478GB-I00, A-TIC-434-UGR20, PREDOC_0164
Forensic Identification Using Artificial Intelligence Techniques: Science or Fiction?
No full textMaterial de la presentación divulgativa "Identificación forense mediante técnicas de inteligencia artificial: ¿Ciencia o ficción?", impartida durante la Semana de la Ciencia. El taller explora el uso de la inteligencia artificial en la identificación forense, abordando sus fundamentos, aplicaciones reales y limitaciones. Se analizan casos prácticos, los avances en el campo y los desafíos éticos y técnicos asociados a estas tecnologías.
El contenido está dirigido a un público general interesado en la intersección entre ciencia forense e inteligencia artificial, incluyendo estudiantes, investigadores y entusiastas de la tecnologíaDepartamento de Medicina Legal, Toxicología y Antropología Física. Universidad de Granada
Futuros de la educación: una revisión de la literatura
No full textLa definición de posibles escenarios de futuro para la educación permite establecer vías de desarrollo y mejora a la vista tanto de los “futuros deseables” como de aquellas otras imágenes que no representen un futuro deseable. En este sentido, la literatura científica ofrece indicaciones acerca de esos posibles futuros y cómo construirlos. La intención de este documento es localizar textos dentro de la producción científica más reciente que nos permitan conocer esos posibles escenarios de futuro para la educación. Con este objetivo se han revisado las bases de datos de publicaciones científicas Web of Science y Scopus y se han analizado los documentos obtenidos. Con esta información se ha realizado una síntesis de contenidos, una selección de ideas clave y la redacción de una serie de preguntas para la reflexión.EduTech Cluster y Conecta1
Narrative mechanisms of subalternity in the contemporary family autonovel
No full textEn este trabajo analizamos las autonovelas familiares como vehículos de historias silenciadas, donde el sujeto narrado está en una posición de subalternidad (Gramsci, Spivak). Desde un abordaje doble de este concepto (memorias subterráneas y antibiografías), nos interesa estudiar el modo en el que los autores se enfrentan a su propio sentido de la subalternidad: desde qué historias eligen hasta cómo extraen la información de las huellas documentales y cómo la (re)presentan en el texto. Para ello, analizaremos Los rojos de ultramar (2004) de Jordi Soler, dos capítulos independientes de Los extraños (2014) de Vicente Valero, West End (2020) de José Morella y Memoria del frío (2021) de Miguel Martínez del Arco.In this work, the analysis focuses on family autonovels as vehicles for silenced stories, where the narrated subject occupies a position of subalternity (Gramsci, Spivak). Through a dual approach to this concept (subterranean memories and antibiographies), the study aims to examine how authors face their own sense of subalternity, including their selection of stories, extraction of information from documentary traces, and (re)presentation within the text. To achieve this, the works analyzed include Los rojos de ultramar (2004) by Jordi Soler, two independent chapters from Los extraños (2014) by Vicente Valero, West End (2020) by José Morella, and Memoria del frío (2021) by Miguel Martínez del Arco
