Buscador de Tesis y publicaciones académicas

Spatial Error Models with Heteroskedastic Normal Perturbations and Joint Modeling of Mean and Variance

J. D. Toloza · O. O. Melo · N. A. Cruz

This work presents the spatial error model with heteroskedasticity, which allows the joint modeling of the parameters associated with both the mean and the variance, within a traditional approach to spatial econometrics. The estimation algorithm is based on the log-likelihood function and incorporates the use of GAMLSS...

La importancia de la administración eficiente del ciclo operativo en las pymes de Santa Cruz y Carrillo

Campos Campos, Diego · Bermúdez Carrillo, Luis A.

This study analyzes the importance of efficient management of the operating cycle by SMEs as a strategy to achieve operability, competitiveness, and its permanence over time. Proper management of the operating cycle allows you to have enough information to estimate and cover your cash needs, and the limits you must man...

Teaching the sterile start: a rapid scoping review and proposed START-OR competency model

Anderson Díaz-Pérez · Wendy Acuña Pérez · Angelica Roca Perez · Arley Vega Ochoa

Abstract Background Surgical hand preparation, patient skin antisepsis, draping readiness and sterile-table set-up are often taught as separate rituals, although delays and failures arise at their interfaces. Evidence also spans microbiology, infection prevention, human factors and education, making it difficult to def...

Insights for Primary Production Businesses from the IPBES Business and Biodiversity Assessment experts

von Hase, Amrei · Sonter, Laura · Bedford, Jacob · Ingram, Jane Carter · y 11 más

These insights draw on the Summary for Policymakers of the IPBES Business and Biodiversity Assessment, approved in February 2026. IPBES, the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services, often described as the “IPCC for biodiversity”. It is an independent intergovernmental body with...

Food systems performance evaluated against targets and benchmarks reveals urgent gaps and a path to 2050

Bianca Carducci · Kate Schneider Lecy · Stella Nordhagen · Ty Beal · y 48 más

Despite national and international commitments to food systems transformation and an increasing adoption of common indicators, no comprehensive targets have been established against which progress can be measured. Here, building on the Food Systems Countdown Initiative framework, we identify existing targets-based on i...

Wolbachia prevalence in Aedes aegypti across five comunas of Medellín, Colombia: Implications for post-release surveillance

Luisa M. Barrientos · Diego F. Rincon · Frank W. Avila · Catalina Alfonso-Parra

A promising sustainable strategy for reducing arbovirus transmission by the mosquito vector Aedes aegypti is the deployment of individuals transinfected with Wolbachia pipientis , a bacterium that inhibits replication of viruses such as dengue and is being used in population replacement programs aimed at blocking Aedes...

Response to Letter to the Editor

Shanon Patel · Ryan Walsh · Paula Villa · Brent Hiebert · y 3 más

The Concentration-Fragility Nexus — Data and Code Repository (Record Concentration, Elusive Fragility)

Restrepo Morales, Jorge Aníbal · Moreno Rodríguez, Rosa Ysabel · Zea Restrepo, Freddy · Giraldo Betancur, Emerson

Version 5.0 consolidates the complete replication materials for Version 3 of the article. zenodo_v7_reconstruction.zip: thirty-year semiannual S&P 500 concentration series (48 SEC N-30D filings, 1996–2026), both format-specific parsers, NPORT-P cross-validation, long-series predictive regressions, out-of-sample MFI, fi...

Venomics of the Anchor Coral Snake Micrurus ancoralis: Composition, Toxicological Profile, and Neutralization by Commercial Antivenom

Paola Rey-Suárez · Jonard Echavarría-Rentería · Jeisson Gómez-Robles · Jaime Pereañez · y 4 más

Coral snakes of the American continent are classified into two genera, Micruroides and Micrurus, with as many as 91 species recognized in the latter. Although envenomings caused by Micrurus are rare, they can be life-threatening due to neurotoxic effects leading to flaccid paralysis and potential respiratory failure. M...

Skewed Criterion-Weight Distributions for Spatially Regularized Selection of IoT-Enabled Environmental Monitoring Nodes

Luis José Castrillo Fernández · John Alexander Taborda Giraldo · Miguel E. Iglesias Martínez

This work presents a spatially regularized modelling framework for selecting IoT-enabled environmental monitoring nodes within smart-lighting infrastructures. The study does not claim novelty in CRITIC, TOPSIS, mixed-integer programming, or Voronoi tessellation as isolated methods. Instead, its contribution is the prob...