Artículos de revistas

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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.

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Now showing 1 - 20 of 1574

2D materials for Tribo-corrosion and -oxidation protection: a review
(Elsevier B.V., 2024) Ramteke, Sangharatna M.; Walczak, Magdalena; De Stefano, Marco; Ruggiero, Alessandro; Rosenkranz, Andreas; Marian, Max
The recent rise of 2D materials has extended the opportunities of tuning a variety of properties. Tribo-corrosion, the complex synergy between mechanical wear and chemical corrosion, poses significant challenges across numerous industries where materials are subjected to both tribological stressing and corrosive environments. This intricate interplay often leads to accelerated material degradation and failure. This review critically assesses the current state of utilizing 2D nanomaterials to enhance tribo-corrosion and -oxidation behavior. The paper summarizes the fundamental knowledge about tribo-corrosion and -oxidation mechanisms before assessing the key contributions of 2D materials, including graphene, transition metal chalcogenides, hexagonal boron nitride, MXenes, and black phosphorous, regarding the resulting friction and wear behavior. The protective roles of these nanomaterials against corrosion and oxidation are investigated, highlighting their potential in mitigating material degradation. Furthermore, we delve into the nuanced interplay between mechanical and corrosive factors in the specific application of 2D materials for tribo-corrosion and -oxidation protection. The synthesis of key findings underscores the advancements achieved through integrating 2D nanomaterials. An outlook for future research directions is provided, identifying unexplored avenues, and proposing strategies to propel the field forward. This analysis aims at guiding future investigations and developments at the dynamic intersection of 2D nanomaterials, tribo-corrosion, and -oxidation protection.
3D SASHA myocardial T1 mapping with high accuracy and improved precision
(2019) Nordio, Giovanna; Bustin, Aurélien; Henningsson, Markus; Rashid, Imran; Chiribiri, Amedeo; Ismail, Tevfik; Odille, Freddy; Prieto Vásquez, Claudia; Botnar, René Michael
A 3D coupled model of turbulent forced convection and diffusion for heat and mass transfer in a bioleaching process
(2015) Muñoz Pardo, José Francisco; Zambra, C.; Moraga, N.
A bi-objective model for the location of landfills for municipal solid waste
(2014) Eiselt, H.; Marianov Kluge, Vladimir
A bumpy ride: structural inequalities, quality standards, and institutional limitations affecting cycling infrastructure
(Elsevier Ltd, 2022) Tiznado-Aitken, Ignacio; Mora Vega, Rodrigo; Oyarzun, Gabriel; Vergara, Jaime; Vecchio, Giovanni; CEDEUS (Chile)
Structural socio-economic and institutional limitations can affect the implementation of cycling infrastructure. More stringent cycling infrastructure standards aiming to solve deficiencies might exacerbate disparities, especially in poor districts with fragmentary governance. Using an audit and quantitative and spatial analysis of cycleways, this paper examines to what extent structural inequalities and governance issues affect the availability and quality of cycling infrastructure, considering new indicative and normative standards aiming at improving cycling infrastructure in Santiago, Chile. Our results show that the distribution of cycleways is unequal and only partially complies with national quality standards. All districts in the city have both high and low standard bicycle lanes, but since district finances have huge differences, this can lead to inequalities in cycle coverage and districts' capabilities to address current standard problems. This raises relevant challenges regarding governance and how to ensure an equitable distribution of cycling infrastructure in Global South cities.
A Capacitive Probe Array for Measurements of Ionization Growth
(1994) Choi, P.; Favre Domínguez, Mario
A Cloud-based Mobile System to Manage Lessons-learned in Construction Projects
(2016) Ferrada Calvo, Ximena Verónica; Nuñez, Daniela; Neyem, Andrés; Serpell, Alfredo; Sepúlveda Fernández, Marcos Ernesto
A Combined and Extended Procedure for Measuring the Soil Water Retention and Hydraulic Conductivity Curves
(2025) Contreras Torres, Cristina Pamela; Acevedo Godoy, Sara Ester; Avila Gorostiaga, Carlos Javier; Martinez, Sofia I.; Bonilla Melendez, Carlos Alberto
Soil-specific properties like water retention and hydraulic conductivity are largely used in soil and environmental modelling and are typically obtained after laboratory analyses. So far, no single method is available to measure the entire suction range for water retention or hydraulic conductivity. Common methods for describing the soil water retention curve (SWRC) include simplified evaporation, pressure plates, neutron spectroscopy, and dewpoint. Regarding hydraulic conductivity, the techniques vary for the saturated or unsaturated condition, using tension disks and transient evaporation methods. In the search for a procedure to describe the entire water retention and hydraulic conductivity curves, the objective of this study was to illustrate the combination and use of a series of laboratory methods in eight different semi-hierarchical combinations to cover the whole suction range (0 <=$$ \le $$ pF <=$$ \le $$ 7). The data obtained from each combination was used to fit the van Genuchten-Mualem equation and compared using the RMSE and Akaike statistics. The main results show that using a combination of many methods for the water retention and hydraulic conductivity curves did not necessarily improve the curve fitting. However, adding data points at near saturation (pF close to 0) or from the driest part of the curve (pF >=$$ \ge $$ 4) improved the estimates on both curves. Specifically, for the clay soil, the RMSE for the hydraulic conductivity curve decreased from 0.0372 to 0.0369 cm/d when measurements from near saturation were added. For the sandy loam 2 soil, the RMSE for the water retention curve decreased from 0.039 to 0038 when including data from the driest part of the curve. Among all the soil-water-related parameters tested in this study, the estimates for the water retention content at the permanent wilting point (theta 1500 kPa) showed the largest difference among all the combinations of methods, up to 52%. In contrast, the difference in the water content at field capacity (theta 33 kPa) estimates was only 3%. This study provides an evaluation and insights to identify the best combination of methods when measuring or parametrizing the soil water retention and hydraulic conductivity curves.
A combined destination and route choice model for a bicycle sharing system
(2016) González, Felipe; Melo Riquelme, C.; Grange Concha, Louis de; CEDEUS (Chile)
This paper studies the supply variables that influence the destination and route choices of users of a bicycle sharing system in the Chilean city of Santiago. A combined trip demand logit model is developed whose explanatory variables represent attributes relating to the topology of the possible routes and other characteristics such as the presence of bikeways, bus service and controlled intersections. The data for the explanatory variables and system users were collected through field surveys of the routes and interviews conducted at the system stations. The results of the model show that proximity to stops on the Santiago Metro and the existence of bikeways are the main factors influencing destination and route choices. Also indicated by the model estimates are gender differences, a preference for tree-lined routes and an avoidance of routes with bus services. Finally, the outcomes reveal considerable potential for the integration of bicycle sharing systems with Metro transit.
A comparative analysis of University Sustainable Travel Plans – Experience from Australia
(2023) Nelson J. D.; Balbontin Tahnuz, Camila; Hensher D. A.; Beck M.
Travel Demand Management (TDM) initiatives are widely applied by transport planners to establish and enable appropriate use of critical transport infrastructure. Less attention has been given to the specific case of TDM in an education precinct (university) context. Travel Plans have been promoted as a means for an organisation to encourage sustainable travel choices by their employees, visitors and customers. This paper offers an empirical contribution to the literature through a comparative qualitative evaluation of selected University Sustainable Travel Plans (USTPs) in Australia to identify the most important questions that a USTP should address explicitly. The evaluation comprised identification of a set of evaluation questions, completion of a template for each USTP considered and application of a simple scoring exercise. We also identify TDM measures that have been introduced as part of a USTP in response to the typical travel patterns exhibited in university settings. A contribution of this paper is to create a means of comparison of USTPs and to establish the components of a comprehensive travel plan.
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 comprehensive review of solar tower CSP systems using TES and molten salts
(2023) Maia, Cristina Brasil; Rodrigues Neumann, Lucas; de Andrade Oliveira, Gabriela; Marques Alves, Igor; Walczak, Magdalena Marta; Paiva Brit, Pedro
The world demand for clean energy has increased significantly due to global population growth and economic expansion and significant investments have been recently conducted to rise electrical power generation capacity from renewable sources. Concentrating solar power (CSP) plants offer dispatchable power by integrating thermal energy storage (TES) and their costs have been reducing significantly in the last years. There are currently four CSP technologies: Linear Fresnel reflectors, parabolic trough collectors, central tower receiver, and parabolic dish systems. Nowadays, molten salts are used both as the primary heat transfer fluid (HTF) and as TES medium, in order to increase the maximum operating temperatures and the CSP plant efficiency. The contribution of the present paper is to summarise the current status of the existing 26 operational or under development CSP plants using central towers with incorporated molten salt TES. Furthermore, the global trends regarding this currently promising CSP installation configuration are highlighted.
A computational workflow for rupture-to-structural-response simulation and its application to Istanbul
(2021) Zhang, W. Y.; Restrepo, D.; Crempien de la Carrera, Jorge; Erkmen, B.; Taborda, R.; Kurtulus, A.; Taciroglu, E.
A convex chance-constrained model for reactive power planning
(2015) Lopez, Julio; Pozo, David; Contreras, Javier; Mantovani, J. R. S.
A critical review of heat and mass transfer in vegetative roof models used in building energy and urban enviroment simulation tools
(2018) Vera Araya, Sergio Eduardo; Pinto, Camilo; Tabares Velasco, Paulo Cesar; Bustamante Gómez, Waldo; CEDEUS (Chile)
A Data-Driven Approach to Discovering Process Choreography
(2024) Hernandez-Resendiz, Jaciel David; Tello-Leal, Edgar; Sepúlveda Fernández, Marcos
Implementing approaches based on process mining in inter-organizational collaboration environments presents challenges related to the granularity of event logs, the privacy and autonomy of business processes, and the alignment of event data generated in inter-organizational business process (IOBP) execution. Therefore, this paper proposes a complete and modular data-driven approach that implements natural language processing techniques, text similarity, and process mining techniques (discovery and conformance checking) through a set of methods and formal rules that enable analysis of the data contained in the event logs and the intra-organizational process models of the participants in the collaboration, to identify patterns that allow the discovery of the process choreography. The approach enables merging the event logs of the inter-organizational collaboration participants from the identified message interactions, enabling the automatic construction of an IOBP model. The proposed approach was evaluated using four real-life and two artificial event logs. In discovering the choreography process, average values of 0.86, 0.89, and 0.86 were obtained for relationship precision, relation recall, and relationship F-score metrics. In evaluating the quality of the built IOBP models, values of 0.95 and 1.00 were achieved for the precision and recall metrics, respectively. The performance obtained in the different scenarios is encouraging, demonstrating the ability of the approach to discover the process choreography and the construction of business process models in inter-organizational environments.
A Data-driven Study of RR Lyrae Near-IR Light Curves: Principal Component Analysis, Robust Fits, and Metallicity Estimates
(2018) Hajdu, Gergely; Dekany, Istvan; Catelan, Márcio; Grebel, Eva K.; Jurcsik, Johanna
A decision support system for planning and scheduling bottling lines in a large winery
(2017) Mac Cawley, A.; Maturana Valderrama, Sergio; Pascual, R.
Planning and scheduling bottling lines in large wineries is an important process that greatly impacts production costs of large wineries, which have several of these lines, and the service level it provides to its clients. A ''good" plan needs to ensure that the wine is packaged and available on time to serve the demand, or else it can affect the service level given to the customer; it also should keep inventory low and efficiently use the bottling lines and labor. The many different aspects that have to be considered, such as the sequence of the products to be bottled, the constraints that have to be met due to production, sanitation, and labor requirements, the different types of setups, some of which are sequence dependent, and the large number of products that have to be scheduled on the different bottling lines, make it a very hard problem to solve without the help of a decision support system (DSS). We describe in this paper a DSS that was implemented for a large winery in the US that uses a mathematical model to help find a good plan that both minimizes production costs and maximizes the service level of their clients. The results obtained on test problems showed that the system could obtain cost reductions in the order of 15% to 30%. A visualization and intervention software was built into the system to support the planning process by allowing the planner an easy visualization of the production schedule through Gantt charts and also the possibility to intervene the solution using drag and drop. Key performance indicators are also presented to help analyze the solution from a cost, production parameter, demand, and capacity perspective. The system is able to provide good solutions in a reasonable amount of time, running on a standard personal computer.
A detailed multi-component heat configuration assessment for complex industrial plants through Monte Carlo simulations: a case study for the cement industry
(2025) Wolde Ponce, Ian; Starke, Allan R.; da Silva, Alexandre K.; Cardemil, José M.
The decarbonization of industrial plants involves the integration of cleaner and more efficient energy processes, which might include electrification, renewable energy sources, waste heat recovery, and thermal energy storage. The technical viability of each assisting technology is usually assessed through direct simulations of the integrated system, which makes evaluation often difficult. This study proposes a methodology for estimating the heat demands of different configurations of a generic cement plant, aiming to assess the fuel consumption for the several integration cases considered. The waste heat and the mass flow rate of the internal streams are considered variable parameters, which lead to 32 distinct integration cases and 16,000 plant simulations. The operating conditions are generated through a Monte Carlo approach, ensuring the probability distribution of the results. The waste heat measures increase the plant’s heat demand and hinder its efficiency. A linear regression for fuel heat demand shows results ranging from 113.72MW to 492.62MW
A diamond nanowire single-photon source
(2010) Babinec, T.; Maze Ríos, Jerónimo

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