Universidad Nacional de Colombia

Machine Learning Approach for Cardiovascular Disease Risk Stratification Using Ensemble Classifiers and Dimensionality Reduction

Cardiovascular disease (CVD) remains a leading cause of morbidity and mortality worldwide, motivating data-driven tools that complement established clinical risk criteria. We present a two-pathway machine learning framework for CVD risk assessment. Pathway I is a brief rule-learn...

Commercial Society as a Philosophical Problem: An Analysis from Mandeville to the Scottish Enlightenment

It is commonly held, on the authority of Hirschman, that interest was elaborated in the seventeenth and eighteenth centuries as a countervailing principle against the destructive passions, and that commercial society rests upon the substitution of calculation for affection. This...

When Dense Networks Diffuse Sparsely: A Stochastic Propagation Operator for Weighted Directed Networks

Classical resolvent centralities on weighted networks aggregate propagation over all observed links. We develop a stochastic propagation operator for weighted directed networks in which only a random subset of links is active at each round, impulses may persist, and receiving nod...

Rural Higher Education as Misrecognition: Reconstructing the Agrarian University from Latin America

This concept paper reconstructs the public agrarian university as an institutional configuration of recognition and reads the rural–urban gap at the threshold of higher education as one material expression of it. The reconstruction runs from Hegel’s assignment of the agricultural...

Cost-Effective Joint Placement of μPMU and AMI in Active Distribution Networks: A MILP Formulation with ANOVA-Validated Performance

The integration of distributed energy resources (DERs) into active distribution networks (ADNs) aggravates existing observability limitations, demanding advanced measurement infrastructure beyond traditional SCADA systems. Micro-phasor measurement units (μPMUs) provide synchroniz...

Foliar Chitosan, Paraburkholderia tropica and Bacillus infantis Alter Chitinase and β-1,3-Glucanase Activity Independently of Meloidogyne spp. Infection and Reduce Nematode Reproduction in Tomato

Root-knot nematodes (Meloidogyne spp.) are the most economically important group of plant-parasitic nematodes worldwide. We tested whether foliar elicitors induce defense enzymes in leaves and reduce nematode reproduction in the roots of the same plants. Tomato cv. Santa Clara, w...

Click Bioconjugation of Aza‐BODIPY Fluorophores to LfcinB Peptides for Improved Biocompatibility

Near‐infrared (NIR) organic fluorophores have emerged as promising for biomedical imaging and theragnostics, offering deep‐tissue penetration and reduced background interference. However, poor aqueous solubility and limitations in photostability, biocompatibility, and targeting h...

Intraoperative Hypotension During Endovascular Therapy for Acute Ischemic Stroke and Functional Outcomes: A Systematic Review and Meta-Analysis

BACKGROUND: Optimal blood pressure management during endovascular therapy (EVT) for acute ischemic stroke remains uncertain. Intraprocedural hypotension may compromise cerebral perfusion and worsen neurological outcomes, yet existing evidence is inconsistent, and no prior meta-an...

The first annotated checklist of the bees of Colombia reveals an overlooked diversity and areas with major data deficiencies

Background Most existing knowledge about bee biodiversity comes from temperate regions, where diversity is presumed highest—yet substantial data gaps across the tropics confound this pattern. Checklists are critical for documenting species presence, identifying knowledge gaps, an...

Unveiling the Molecular Driving Forces of Pollutant Extraction by Hydrophobic Eutectic Solvents

Abstract Hydrophobic eutectic solvents (HES) are emerging as sustainable alternatives to conventional organic solvents for the extraction of molecular pollutants from water. Yet, their selectivity remains poorly understood, hindering the predictive design of eutectic solvents bey...

Invasive Fungal Disease: From Diagnostic and Therapeutic Failure to Integrated Care

Invasive fungal diseases remain an important cause of severe illness and death worldwide, and timely recognition and effective treatment are still difficult to achieve [...]

Metatranscriptomic insights into mosquitoes and sand flies from Colombia reveal extensive virome variability and detection of bacterial and viral-related resistomes

Mosquitoes and sand flies are primary vectors of a wide range of pathogenic microorganisms that affect human and animal health worldwide. Their microbial communities directly affect their vector capacity and have become a focus of research for the development of novel biocontrol...

Characterization of Consumer Flexibility and Its Impact on Voltage Regulation in Distribution Systems

Modern distribution networks face growing challenges from demand growth, electrification, and distributed energy resources, complicating voltage regulation and service quality. While demand response has been proposed as a complementary tool, most existing studies assume predefine...

Sharp anisotropic Gevrey regularization and directional microlocal smoothing for dissipative–dispersive Fourier evolutions

Abstract We establish a sharp Fourier–Gevrey regularization theory for a broad class of nonautonomous dissipative–dispersive evolution equations on $$\mathbb {R}^n$$ R n . The dissipative symbol is allowed to have different fractional orders in different coordinate directions, wh...

Comprehensive analysis for the production of neem bioinsecticide in Colombia: from chemistry to economic analysis

Abstract Neem-based products are on the rise, particularly those with biopesticide potential. Despite this, the cultivation and agro-industrial potential in Colombia remains undeveloped. This study evaluated the chemical composition, oil yield, and economic feasibility of neem (...

Electronic and Charge-Transfer Properties of Bimetallic Nanocluster–Graphene Hybrids with Stone–Wales Defects for Biosensing Applications

Abstract Graphene-based materials functionalized with bimetallic nanostructures have emerged as promising platforms for electrochemical sensing. However, the mechanisms governing complex–surface interactions are often oversimplified and commonly attributed to net charge transfer,...

Influence of Stress Path and Particle Quantity on Granular Soil Critical State and Fabric: Insights from DEM Simulations

Abstract Critical-state soil mechanics provides a fundamental framework for describing the shearing behavior of granular materials. This study employs the discrete-element method (DEM) to investigate the critical-state behavior of granular materials under direct shear, direct sim...

Environmental Degradation and Sustainability Governance in Colombia: An Integrative Review

Environmental degradation in Colombia is often studied through separate sectoral lenses, although air pollution, emerging water contaminants, urban noise, mining-related soil contamination, artisanal-mining exposure, and material throughput arise from overlapping institutional an...

Influence of soil mineralogy on calcium carbonate precipitation induced by calcifying bacteria

This study investigates the influence of soil mineralogy on microbially induced carbonate precipitation (MICP) using the ureolytic bacterium Sporosarcina pasteurii. Silica sand (SS), kaolinite clay (KC), and montmorillonite-rich bentonite clay (BC) were evaluated in soil supensio...

Exploratory Evidence on ChatGPT Adoption Among Undergraduate Engineering Students in Medellín, Colombia: A 2023 Logistic Regression and a 2025 Descriptive Pilot

Evidence on generative artificial intelligence adoption remains limited in Latin American engineering education, particularly for undergraduate populations in which paid employment may shape study practices. This exploratory study examined reported ChatGPT (GPT-4o model) use amon...