Artículos de revistas

Permanent URI for this collection

https://repositorio.uc.cl/handle/11534/1156

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

Browse

Now showing 1 - 20 of 925

A Binary Expansion Approach for the Water Pump Scheduling Problem in Large and High-Altitude Water Supply Systems
(2024) Cariaga, Denise; Lorca, Alvaro; Anjos, Miguel F.
The water pump scheduling problem is an optimisation model that determines which water pumps will be turned on or off at each time period over a given time horizon for a given water supply system. This problem has received considerable attention in mining and desalination due to the high power consumption of water pumps and desalination plants and the complicated dynamics of water flows and the power market. Motivated by this, in this paper we solve the optimal operation of a desalinated water supply system consisting of interconnected tanks and pumps that transport water to high-altitude reservoirs. The optimisation of this process encounters several difficulties arising from (i) the nonlinearities of the equations for the frictional losses along the pipes and pumps, which makes the problem a nonlinear mixed-integer model, and (ii) many possible combinations of pressure head and flow rates, which quickly leads to high computational costs. These limitations prevent the problem from being solved in a reasonable computational time in high-altitude water supply systems with more than six pumps and reservoirs, as in many networks worldwide. Therefore, in this work we develop new exact methods for the optimal pump scheduling problem that use a binary expansion approach to efficiently account for the existing nonlinearities by reducing the computational difficulties of the original problem while keeping an excellent representation of the physical phenomena involved. We also extensively tested the proposed approach in different network topologies and a case study for a real-world copper mine water network, and we conclude that the binary expansion approach significantly reduces the computational time for solving the problem with high precision, which can be very relevant for the practical daily operation of real-world water supply systems.
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.
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
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 in Human Trial Implanting Microalgae Shows Safety of Photosynthetic Therapy for the Effective Treatment of Full Thickness Skin Wounds
(FRONTIERS MEDIA SA, 2021) Obaid, Miguel Luis; Camacho, Juan Pablo; Brenet, Marianne; Corrales Orovio, Rocio; Carvajal Diaz, Felipe Alonso; Martorell, Ximena; Werner, Consuelo; Simon, Valeska; Varas, Juan; Calderon, Wilfredo; Guzman, Christian Dani; Bono, Maria Rosa; San Martin, Sebastián; Eblen Zajjur, Antonio Alejandro; Egaña Erazo, José Tomás
Insufficient oxygen supply represents a relevant issue in several fields of human physiology and medicine. It has been suggested that the implantation of photosynthetic cells can provide oxygen to tissues in the absence of a vascular supply. This approach has been demonstrated to be successful in several in vitro and in vivo models; however, no data is available about their safety in human patients. Here, an early phase-1 clinical trial ( identifier: NCT03960164, ) is presented to evaluate the safety and feasibility of implanting photosynthetic scaffolds for dermal regeneration in eight patients with full-thickness skin wounds. Overall, this trial shows that the presence of the photosynthetic microalgae Chlamydomonas reinhardtii in the implanted scaffolds did not trigger any deleterious local or systemic immune responses in a 90 days follow-up, allowing full tissue regeneration in humans. The results presented here represent the first attempt to treat patients with photosynthetic cells, supporting the translation of photosynthetic therapies into clinics.
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 framework for hybrid model predictive control in mineral processing
(2015) Karelovic, Pablo; Putz, Eduardo; Cipriano, Aldo
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 method to estimate maximum and minimum air temperature using MODIS surface temperature and vegetation data : application to the Maipo Basin, Chile
(2015) Bustos, E.; Meza, Francisco Javier
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 model for simulating the performance and irrigation of green stormwater facilities at residential scales in semiarid and Mediterranean regions
(2017) Herrera, J.; Bonilla Meléndez, Carlos Alberto; Castro, L.; Vera Araya, Sergio Eduardo; Reyes, R.; Gironás León, Jorge Alfredo
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)

Browse

Browsing Artículos de revistas by browse.metadata.categoriaods "06 Agua limpia y saneamiento"

Results Per Page

Sort Options