Examinando por Materia "Principal Component Analysis (PCA)"

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    A Predictive Model for the Anisotropy Index of Semi-Coke Derived from the Properties of Colombia's Eastern Cordillera Coals
    (Universidad EAFIT, 2020-11-11) Romero-Salcedo, Eliana; Manosalva-Sánchez, Sandra; Naranjo-Merchán, Wilson; García-Cabrejo, Oscar; Bermúdez, Mauricio A; Gómez-Neita, Juan; Universidad Pedagógica y Tecnológica de Colombia
    This study developed a theoretical model for the determination of the Coke Anisotropy Quotient (CAQ) of semi-coke from the properties of its precursor coal. This is an useful parameter to define the resistance and reactivity of semi-coke in the blast furnace. For 36 semi-coke samples, a textural analysis was performed alongside a fluidity test to determine the real CAQ. The main textures observed were: isotropic and circular for high volatile bituminous coals (HVB); lenticular and fine ribbons for the medium volatile bituminous coals (MVB); and medium and thick ribbons for the low volatile bituminous coals (LVB). The CAQ varied in a range from 1 to 11. A principal component analysis (PCA) and multiple regression allowed to discriminated the importance of certain coal properties, in determining the CAQ to be recognized and to estimate parameters of the mathematical model. The statistical analysis suggested that CAQ can be best predicted from the fluidity, volatile matter, and Ro of the parent coals. The veracity of this model result was then tested using a second dataset from Poland. This work optimizes the usefulness of standard datasets in the prediction of CAQ's offering a means of quality control that could be implemented in Colombian coke production.
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    Ítem
    Structural Controls on Geothermal Systems along the Northern Andes of Colombia : An Integrated Remote Sensing Analysis of the Dabeiba and Sibundoy Valley Geothermal Fields
    (Universidad EAFIT, 2024) Montoya Londoño, Nicolás; Marín Cerón, María Isabel
    This study employs a combination of remote sensing techniques and geothermal analysis to investigate the structural and thermal characteristics of two geothermal systems in Colombia. By utilizing Mark's proposal (1992) for delimitating lineaments, and Principal Component Analysis (PCA) for generating shadow models, the research highlights regional and local structural features that are closely associated with geological structures. Fault systems and lineaments emerge as crucial elements influencing subsurface fluid flow, heat transfer, and the development of geothermal reservoirs. The integration of remote sensing data with advanced structural analysis techniques reveals significant factors shaping geothermal dynamics in the region. These findings emphasize the necessity of considering structural controls in the exploration and sustainable management of geothermal resources. The study focuses on the Dabeiba Geothermal System (DGS), potentially linked to a Miocene extensional event, emphasizing the role of fault structures, especially in the Guineales Formation, as conduits for fluid flow and heat migration from deep sources. The complex structural zones with different degrees of deformation and fracture densities directly influence the advection of the isotherms near the Dabeiba-Pueblo Rico suture zone. This geothermal play system is dominated by fault-controlled non-magmatic convection, where convection occurs predominantly along fault lines and is accompanied by meteoric water infiltration along their traces. The Sibundoy Valley Geothermal System (SVGS) as a typical example of a mixed geothermal system, where heat originates from a young magmatic source but is mainly controlled by deep faults within a pull-apart basin. These faults not only influence the distribution of monogenetic volcanoes but also shape the spatial arrangement of hydrothermal springs. The interaction between geological structures and fluid flow patterns highlights the complexity of geothermal systems. Furthermore, the presence of partial crystallizations and unique caldera geometries leads to the formation of seal layers or condensate layers, redirecting both meteoric water recharge fluxes and volcanic heat fluxes, significantly impacting hydrogeological and geothermal dynamics. This research contributes valuable insights for the geoscientific and energy exploration communities, informing decision-making processes for the assessment and development of geothermal resources.