Now showing items 21-40 of 2894

  • A dual-mixed finite element method for nonlinear incompressible elasticity with mixed boundary conditions 

    Gatica, Gabriel N.; Gatica, Luis F.; Stephan, Ernst (2007)
    In this paper we consider the Hu-Washizu principle and propose a new dual-mixed finite element method for nonlinear incompressible plane elasticity with mixed boundary conditions. The approach extends a related previous ...
  • A FEM–DtN formulation for a non-linear exterior problem in incompressible elasticity 

    Gatica, Gabriel; Gatica, Luis; Stephan, Ernst (2003)
    In this paper, we combine the usual infinite element method with a Dirichlet-to-Neumann (DtN) mapping, derived in terms of an infinite Fourier series, to study the solvability and Galerkin approximations of an exterior ...
  • A framework for mapping and monitoring human-ocean interactions in near real-time during COVID-19 and beyond 

    Ward-Paige, CA; White, ER; Madin, EMP; Osgood, GJ; Bailes, LK; Bateman, RL; E.Belonje, E.; Burns, KV; Cullain, N.; Darbyshire-Jenkins, P.; de Waegh, R.S.; Eger, AM; Fola-Matthews, L.; Ford, BM; Gonson, C.; Honeyman, CJ; House, JE; Jacobs, E.; Jordan, LK; Levenson, JJ; Lucchini, K.; Martí-Puig, P; McGuire, LAH; Meneses, C.; Montoya-Maya, PH; Noonan, RA; Ruiz-Ruiz, PA; Ruy, PE; Saputra, RA; Shedrawi, G.; Sing, B.; Tietbohl, MD; Twomey, A.; Vergara Florez, DC; Yamb, L. (2022)
    The human response to the COVID-19 pandemic set in motion an unprecedented shift in human activity with unknown long-term effects. The impacts in marine systems are expected to be highly dynamic at local and global scales. ...
  • A fully-mixed finite element method for the coupling of the Navier–Stokes and Darcy–Forchheimer equations 

    Caucao Paillán, Sergio; Gatica, Gabriel N.; Sandoval, Felipe (2021-05)
    In this work we present and analyze a fully-mixed formulation for the nonlinear model given by the coupling of the Navier–Stokes and Darcy–Forchheimer equations with the Beavers–Joseph–Saffman condition on the interface. ...
  • A generalized action for(2 + 1)-dimensional Chern–Simons gravity 

    Díaz, José; Fierro, Octavio; Izaurieta, Fernando; Merino, Nelson; Rodríguez, Eduardo; Salgado, Patricio; Valdivia, Omar (2012)
    We show that the so-called semi-simple extended Poincar ́e (SSEP) algebra inDdimensions canbe obtained from the anti-de Sitter algebraso(D−1,2) by means of theS-expansion procedurewith an appropriate semigroupS. A general ...
  • A graph approach for the construction of high order divergence-free Raviart–Thomas finite elements 

    Alonso Rodríguez, Ana María; Camaño Valenzuela, Jessika; De Los Santos, E.; Rapetti, F. (2018-12)
    We propose and analyze an efficient algorithm for the computation of a basis of the space of divergence-free Raviart–Thomas finite elements. The algorithm is based on graph techniques. The key point is to realize that, ...
  • A healthy eating score is inversely associated with depression in older adults: results from the Chilean National Health Survey 2016–2017 

    Lanuza, Fabian; Petermann-Rocha, Fanny; Celis-Morales, Carlos; Concha-Cisternas, Yeny; Nazar, Gabriela; Troncoso-Pantoja, Claudia; Lassere-Laso, Nicole; Martínez-Sanguinetti, María Adela; Parra-Soto, Solange; Zamora-Ros, Raul; Andrés-Lacueva, Cristina; Meroño, Tomás (2022)
    Objective: To investigate the relationship of a healthy eating score with depression in Chilean older adults. Design: Cross-sectional study. Setting: Older adults from the Chilean National Health Survey 2016–2017. Associations ...
  • A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS 

    Astudillo Defru, Nicola; Cloutier, Ryan; Wang, S. X.; Teske, J.; Brahm, R.; Hellier, C.; Ricker, G.; Vanderspek, R.; Latham, D.; Seager, S.; Winn, J. N.; Jenkins, J. M.; Collins, Karen A.; Stassun, K. G.; Ziegler, C.; Almenara, José Manuel; Anderson, David R.; Artigau, Étienne; Bonfils, X.; Bouchy, F.; Briceño, C.; Butler, R. P.; Charbonneau, D.; Conti, Dennis M.; Crane, J.; Crossfield, Ian J. M.; Davies, M.; Delfosse, X.; Díaz, R. F.; Doyon, R.; Dragomir, D.; Eastman, J. D.; Espinoza, N.; Essack, Z.; Feng, F.; Figueira, P.; Forveille, T.; Gan, T.; Glidden, A.; Guerrero, N.; Hart, R.; Henning, Th.; Horch, E. P.; Isopi, G.; Jenkins, J. S.; Jordán, A.; Kielkopf, J. F.; Law, N.; Lovis, C.; Mallia, F.; Mann, A. W.; De Medeiros, J. R.; Melo, C.; Mennickent, R. E.; Mignon, L.; Murgas. F.; Nusdeo, D. A.; Pepe, F.; Relles, H. M.; Rose, M.; Santos, N. C.; Ségransan, D.; Shectman, S.; Shporer, A.; Smith, J. C.; Torres, P.; Udry, S.; Villaseñor, J.; Winters, J. G.; Zhou, G. (2020-04)
    We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R⊕) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed ...
  • A hybrid deterministic and stochastic approach for tsunami hazard assessment in Iquique, Chile 

    González, Juan; González, Gabriel; Aránguiz Muñoz, Rafael Enrique; Melgar, Diego; Zamora, Natalia; Shrivastava, Mahesh N.; Das, Ranjit; Catalán, Patricio A.; Cienfuegos, Rodrigo (2020-01)
    The southern Peru and northern Chile coastal region is an active subduction zone that contains one of the most signifcant seismic gaps in the eastern Pacifc basin (~17°S–~24°S). Although the gap was partially flled by the ...
  • A methodological approach to improve the performance in operating room management 

    Neriz, Liliana; Ramis, Francisco; Bull, María T.; Concha, Pablo; Silva, Daniela; Bustamante, Hernán (2020-03-04)
    This research seeks to improve the service quality provided in Operating Rooms through a Key Performance Indicators (KPI) system based on the analysis of processes and resources used in three surgical units in Chile. This ...
  • A mixed method for the biharmonic problem based on a system of first-order equations. 

    Behrens R., Edwin Marcelo; Guzmán, Johnny (2011)
    We introduce a new mixed method for the biharmonic problem. The method is based on a formulation where the biharmonic problem is rewritten as a system of four first-order equations. A hybrid form of the method is introduced ...
  • A modular multilevel series/parallel converter for a wide frequency range operation 

    Li, Zhongxi; Lizana F., Ricardo; Yu, Zhujun; Sha, Sha; Peterchev, Angel V.; Goetz, Stefan M. (2019-10)
    When providing ac output, modular multilevel converters (MMCs) experience power fluctuation in the phase arms. The power fluctuation causes voltage ripple on the module capacitors, which grows with the output power and ...
  • A multicenter study evaluating the stages of change in food consumption with warning labels among Chilean university students 

    Durán Agüero, Samuel; Araneda, Jacqueline; Ahumada, Danay; Silva Rojas, Jaime; Bühring Bonacich, Rodrigo; Caichac, Astrid; Fernández Salamanca, Marcelo; Villarroel, Pía; Fernández, Eloína; Pacheco, Viviana; Aravena Martinovic, Paola; Wilson, Waleska; Neira, Ana María; Encina, Claudia; Moya Tillería, Jessica (2020-01-16)
    Objective. To analyze the stage of change in food consumption with warning labels among Chilean university students. Materials and Methods. Cross-sectional study which applied surveys in universities from all over the ...
  • A multicentre study of psychological variables and the prevalence of burnout among primary health care nurses 

    Ortega-Campos, Elena; Cañadas-De la Fuente, Guillermo A.; Albendín García, Luis; Gómez-Urquiza, José L.; Monsalve-Reyes, Carolina; Fuente-Solana, E. Inmaculada de la (2019-09-04)
    Nurses in primary health care (PHC) have multiple responsibilities but must often work with limited resources. The study’s aim was to estimate burnout levels among PHC nurses. A Quantitative, observational, cross-sectional, ...
  • A multicriteria hierarchical approach for portfolio selection in a stock exchange 

    Bernal, María; Anselmo Álvarez, Pavel; Muñoz, Manuel; León Castro, Ernesto; Gastelum Chavira, Diego Alonso (2021)
    The objective of the paper is to present a multiple criteria hierarchical process (MCHP) approach for portfolio selection in a stock exchange. One of the problems that investors usually face is which stock should be included ...
  • A new family of Mixed Methods for the Reissner-Mindlin Plate Model based on a System of first-order equations 

    Guzmán, Johnny; Behrens R., Edwin Marcelo (2011)
    The mixed method for the biharmonic problem introduced in [12] is extended to the Reissner-Mindlin plate model. The Reissner-Mindlin problem is written as a system of first order equations and all the resulting variables ...
  • A new measure of volatility using induced heavy moving averages 

    León Castro, Ernesto; Espinoza Audelo, Luis Fernando; Avilés Ochoa, Ezequiel; Merigó, José M.; Kacprzyk, Janusz (2019)
    The volatility is a dispersion technique widely used in statistics and economics. This paper presents a new way to calculate volatility by using different extensions of the ordered weighted average (OWA) operator. This ...
  • A new species of Proctoeces and reinstatement of Proctoeces humboldti George-Nascimento and Quiroga 1983 (Digenea: Fellodistomidae) based on molecular and morphological evidence 

    Oliva, Marcelo E.; Valdivia, Isabel M.; Cárdenas, Leyla; Muñoz, Gabriela; Escribano, Ruben; George-Nascimento, Mario (2018-04)
    The most studied digenean of marine organisms in Chile is by far Proctoeces humboldti, a parasite of the intestine of the clingfish Sicyases sanguineus and gonad of the keyhole limpet Fissurella spp. (progenetic metacercariae). ...
  • A novel approach to the creation of a labelling lexicon for improving emotion analysis in text 

    Segura Navarrete, Alejandra; Martínez Araneda, Claudia; Vidal Castro, Christian; Rubio Manzano, Clemente (2021)
    Purpose – This paper aims to describe the process used to create an emotion lexicon enriched with the emotional intensity of words and focuses on improving the emotion analysis process in texts. Design/methodology/approach ...