| Table of contents Ing. Investig. vol.41 no.3 Bogotá Sep./Dec. 2021 Letter to Editor | | | | · COVID-19 Is in the Air: Why Are We Still Ignoring the Importance of Ventilation? Rojas, Nestor Y.; Rodríguez-Villamizar, Laura A.
| | | Original articles | | | | · Full Model Selection Problem and Pipelines for Time-Series Databases: Contrasting Population-Based and Single-point Search Metaheuristics Pérez-Castro, Nancy; Acosta-Mesa, Héctor Gabriel; Mezura-Montes, Efrén; Cruz-Ramírez, Nicandro
| | | | · The Influence of Safety Climate, Motivation, and Knowledge on Worker Compliance and Participation: An Empirical Study of Indonesian SMEs Ansori, Nachnul; Widyanti, Ari; Yassierli
| | | | · Current Innovation Sources Driving The Spanish Electric Power Sector Mergelina, Pablo de; Lemus-Aguilar, Isaac
| | | | · Design and Analysis of a Bulge Test Device Martínez Palmeth, Luis Humberto; Gonzales Carmona, María Angelica; Miranda Castro, José
| | | | · Batch Conversion of Methane to Methanol Using Copper Loaded Mordenite: Influence of the Main Variables of the Process Mojica Molina, Hebert Rodrigo; González Montiel, Marlene; Navarro Frómeta, Amado Enrique
| | | | · Cost Forecasting of Public Construction Projects Using Multilayer Perceptron Artificial Neural Networks: A Case Study Pessoa, Alcineide; Sousa, Gean; Furtado Maués, Luiz Maurício; Campos Alvarenga, Felipe; Santos, Débora de Gois
| | | | · Design of Comminution Plants in the Ceramic Industry Using a Simulation-based Optimization Approach Ortiz de Landazuri Suárez, Ignacio; Oliveros Colay, María-José
| | | | · Verification of a Fabless Device Model Using TCAD Tools: from Bipolar Transistor Formation to I-V Characteristics Extraction Barzdenas, Vaidotas; Grazulevicius, Gediminas; Liobe, John; Vasjanov, Aleksandr; Kladovscikov, Leonid
| | | | · Removal of Sulfate Ions by Precipitation and Flotation Santander-Muñoz, Mario; Cardozo-Castillo, Paola; Valderrama-Campusano, Luis
| | | | · Characterization of High-Rise Reinforced Concrete Buildings Located in Antofagasta, Chile, by Means of Structural Indexes Music Tomicic, Juan Andrés; Soto Ramírez, Felipe Ignacio
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