Publicaciones académicas

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Esta colección incluye artículos de profesores de la Pontificia Universidad Católica de Chile, publicados en revistas nacionales y extranjeras.

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Now showing 1 - 20 of 751

A comparative study of manhole hydraulics using stereoscopic PIV and different RANS models
(2018) Azim Beg, Md Nazmul; Carvalho, Rita F.; Tait, Simon; Brevis Vergara, Wernher; Rubinato, Matteo; Schellart, Alma; Leandro, Jorge
A composite indicator approach to assess the sustainability and resilience of wastewater management alternatives
(2020) Sun, Y.; Garrido Baserba, M.; Molinos Senante, María; Donikian, N. A.; Poch, M.; Rosso, D.; CEDEUS (Chile)
A comprehensive evaluation of pedotransfer functions for predicting soil water content in environmental modeling and ecosystem management
(2018) Contreras, Cristina P.; Bonilla Meléndez, Carlos Alberto; CEDEUS (Chile)
A Dynamic, Multivariate Sustainability Measure for Robust Analysis of Water Management under Climate and Demand Uncertainty in an Arid Environment
(2015) Hunter Cure, Christian Kent; Gironás León, Jorge Alfredo; CEDEUS (Chile)
A First Omics Data Integration Approach in Hass Avocados to Evaluate Rootstock-Scion Interactions: From Aerial and Root Plant Growth to Fruit Development
(2024) Nunez-Lillo, Gerardo; Ponce, Excequel; Beyer, Clemens P.; Alvaro, Juan E.; Meneses, Claudio; Pedreschi, Romina
Grafting, the careful selection of rootstocks and scions, has played a crucial role maintaining Chilean avocado fruit quality standards in a scenario in which climate change and drought-related issues have considerably decreased avocado fruit production in the last fifteen years. The historical use of seedling rootstocks in Chile has experienced a recent shift towards clonal rootstocks, driven by the potential to produce more consistent and predictable crops. This research aims to compare Hass avocado plants grafted on Mexicola seedling and Dusa (R) clonal rootstocks in a soilless and protected system using (i) a differential expression analysis of root and leaf samples and (ii) a fruit transcriptomic and metabolomic integration analysis to improve our understanding of rootstock-scion interaction and its impact on avocado tree performance and fruit quality. The results demonstrated that no significant transcriptomic and metabolomic differences were identified at fruit level in the ready-to-eat (RTE) stage for Hass avocado fruit from both rootstocks. However, Hass avocados grafted on the clonal rootstock showed greater aerial growth and slightly increased fruit size than the seedling rootstock due to the enrichment of cell wall-remodeling genes as revealed in leaves and fruit at harvest stage.
A GIS-based urban and peri-urban landscape representation toolbox for hydrological distributed modeling
(2017) Sanzana Cuevas, Pedro Pablo; Gironás León, Jorge Alfredo; Brand, I.; Branger, F.; Rodríguez, F.; Vargas, X.; Hitschfeld, N.; Muñoz Pardo, José Francisco; Vicuña, Sebastián; Mejía, A.; Jankowski, S.; CEDEUS (Chile)
A hybrid representation approach for modelling complex dynamic bioprocesses
(2000) Thibault, J.; Acuna, G.; Perez Correa, Jose Ricardo; Jorquera, H.; Molin, P.; Agosin, E.
A hydrogeochemistry and isotopic approach for the assessment of surface water-groundwater dynamics in an arid basin : the Limari watershed, North-Central Chile
(2015) Oyarzun, Ricardo; Jofre, Elizabeth; Morales, Paulina; Maturana, Hugo; Oyarzun, Jorge; Kretschmer, Nicole; Aguirre, Evelyn; Gallardo, Patricio; Toro, Luis E.; Muñoz Pardo, José Francisco; Aravena, Ramón
A mechanism of male germ cell apoptosis induced by bisphenol-A and nonylphenol involving ADAM17 and p38 MAPK activation
(2014) Urriola Muñoz, Paulina Andrea; Lagos Cabré, Raúl Cristián.; Moreno Mauro, Ricardo D.
A Mixed-Integer Programming Model for Gas Purchase and Transportation
(2005) Contesse Becker, Luis; Ferrer Ortiz, Juan Carlos; Maturana Valderrama, Sergio
The natural gas supply chain involves three main agents: producers, transportation companies, and local distribution companies (LDCs). We present a MIP model that is the basis for a decision support system developed for a Chilean LDC. This model takes into account many of the complexities of the purchasing and transportation contracts to help optimize daily purchase and transportation decisions in the absence of local storage facilities. The model was solved to optimality within a reasonable time. We show how the model handles several contractual issues and give some insights for the case when demand scenarios are used to deal with uncertainty.
A morpho-climatic instantaneous unit hydrograph model for urban catchments based on the kinematic wave approximation
(ELSEVIER SCIENCE BV, 2009) Gironas, Jorge; Niemann, Jeffrey D.; Roesner, Larry A.; Rodriguez, Fabrice; Andrieu, Herve
Stormwater models are valuable tools in urban planning as well as stormwater system design and management. Although the hydraulic simulation of pipes and channels in these models is often quite sophisticated, the hydrologic simulation of the flow contributing to the hydraulic elements is frequently greatly simplified. Hydrologic simulation of urban catchments is made particularly complex due to the presence of features such as streets, small pipes, and channels. In this study, we develop a new model called the U-McIUH (Urban Morpho-climatic Instantaneous Unit Hydrograph), which defines the IUH as the probability density function of the travel time from a random location in the urban terrain to the outlet. Flow paths are extracted from a specially processed digital elevation model that incorporates hillslopes, streets, pipes, and channels, and travel times are computed in each cell using the average wave celerity from kinematic wave theory. These expressions depend on the upstream contribution of flow and the excess rainfall intensity, so they incorporate the so-called climatic dependence of the IUH, which is the dependence of the unit hydrograph on the rainfall intensity. Rainfall pulses of different intensities are convoluted with their respective IUH and superimposed to generate the response to a given storm event. The application of the model to a real catchment provides good reproduction of observed hydrographs, suggesting that the U-McIUH is able to capture some significant hydrologic properties of the catchment. The model is studied by analyzing the effects of (1) the upstream contribution of flow on the travel time formulation, (2) the variation of flow velocities within the urban catchment, (3) the non-linear dependence of the IUH on the rainfall intensity (i.e. the climatic dependence), and (4) the spatial distribution of imperviousness. Overall, these results suggest that the presence of artificial elements in urban watersheds has a significant role in determining the travel times and thus the hydrologic response of the watershed. (C) 2009 Elsevier B.V. All rights reserved.
A multiscale inversion algorithm for engineering inspection using GPR data
(2023) Gutierrez Cid, Sergio Enrique; Menanno, Giovanni; Yanez, Gonzalo
A NEGLECTED WATER-RESOURCE - THE CAMANCHACA OF SOUTH-AMERICA
(1988) SCHEMENAUER, RS; FUENZALIDA, H; CERECEDA, P
A neural network estimator for total biomass of filamentous fungi growing on two dimensional solid substrate
(KLUWER ACADEMIC PUBL, 1998) Acuna, G; Giral, R; Agosin, E; Jorquera, H; Perez Correa, R; Ferret, E; Molin, P; Thibault, J
A neural network dynamic model is proposed for the on-line estimation of total biomass during filamentous fungi cultures on two dimensional solid substrate. The neural network provides an accurate and robust estimation of biomass from macroscopic measurements of the colony radius evolution. Experiments were performed on Gibberella fujikuroi growing on Petri dishes under different conditions of temperature and water activity.
A new aerobic chemolithoautotrophic arsenic oxidizing microorganism isolated from a high Andean watershed
(2018) Anguita, Javiera M.; Rojas, Claudia; Pastén González, Pablo Arturo; Vargas Cucurella, Ignacio Tomás; CEDEUS (Chile)
A new applications manual for the Storm Water Management Model (SWMM)
(2009) Gironas Leon, Jorge Alfredo; Roesner, Larry A.; Rossman, Lewis A.; Davis, Jennifer
A new method for sensing soil water content in green roofs using plant microbial fuel cells
(2018) Tapia, N. F.; Rojas, C.; Bonilla Meléndez, Carlos Alberto; Vargas, I. T.; CEDEUS (Chile)
A new methodology to evaluate adsorption capacity on nanomaterials
(2015) Antilen, Mónica; Amiama, F.; Otaiza, M.; Armijo, F.; Escudey, M.; Pizarro, C.; Arancibia Miranda, N.
A novel extracellular multicopper oxidase from Phanerochaete chrysosporium with ferroxidase activity
(2003) Larrondo Castro, Luis Fernando; Salas, L.; Melo Ledermann, Francisco Javier; Vicuña, Rafael; Cullen, D.
Lignin degradation by the white rot basidiomycete Phanerochaete chrysosporium involves various extracellular oxidative enzymes, including lignin peroxidase, manganese peroxidase, and a peroxide-generating enzyme, glyoxal oxidase. Recent studies have suggested that laccases also may be produced by this fungus, but these conclusions have been controversial. We identified four sequences related to laccases and ferroxidases (Fet3) in a search of the publicly available P. chrysosporium database. One gene, designated mco1, has a typical eukaryotic secretion signal and is transcribed in defined media and in colonized wood. Structural analysis and multiple alignments identified residues common to laccase and Fet3 sequences. A recombinant MCO1 (rMCO1) protein expressed in Aspergillus nidulans had a molecular mass of 78 kDa, as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and the copper I-type center was confirmed by the UV-visible spectrum. rMCO1 oxidized various compounds, including 2,2′-azino(bis-3-ethylbenzthiazoline-6-sulfonate) (ABTS) and aromatic amines, although phenolic compounds were poor substrates. The best substrate was Fe2+, with a Km close to 2 μM. Collectively, these results suggest that the P. chrysosporium genome does not encode a typical laccase but rather encodes a unique extracellular multicopper oxidase with strong ferroxidase activity.
A numerical model for linking soil organic matter decay and wildfire severity
(2021) Aedo Quililongo, Sebastián Alejandro; Bonilla Meléndez, Carlos Alberto; CEDEUS (Chile)
Wildfires are a critical phenomenon in terrestrial ecosystems, and the intensity and frequency of these events have increased in recent years. High temperatures in the topsoil during wildfires can induce changes in soil physical, chemical, and biological properties due to the loss of soil organic matter (SOM). Therefore, the main objective of this study was to develop a numerical model to predict SOM decay during wildfire events. The model identifies the main parameters controlling SOM decay and predicts its decline by coupling the energy balance for soil heating and species conservation for water and SOM using high temperature-induced vaporization and combustion kinetics. Fluid flow was not included; however, the radiative energy conducted through soil pores was incorporated as a volumetric pore radius function. When the radiative term in the thermal conductivity was not considered, the model predicted the soil thermal evolution with a determination coefficient r(2) > 0.91 and with an r(2) > 0.98 when the volumetric pore radius was adjusted. The main parameters controlling SOM decay were soil texture, oxygen availability, and initial soil water and SOM contents. SOM decay was also dependent on the wildfire temperature and exposure time. In terms of soil texture, SOM decay increases as sand increases or clay reduces. The main results showed that the soil water content controlled the amount of heat consumed during vaporization, the normalized SOM decay does not depend on the initial SOM content, and the restricted oxidation limited SOM decay. Finally, this study reduces the number of parameters when studying SOM decay and second-order fire effects for post-fire assessment and restoration. Also, because it provides a better understanding of how wildfires affect SOM, implemented as an additional routine, the model can enhance other existing computer models for describing ecological processes.

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