Repositorio Académico de la Universidad de Chile: Recent submissions

Now showing items 34921-34940 of 97836

    • Almost automorphic delayed differential equations and Lasota-Wazewska model 
      Coronel, Aníbal; Maulén, Christopher; Pinto, Manuel; Sepúlveda, Daniel (Southwest Missouri State University, 2017)
      Existence of almost automorphic solutions for abstract delayed differential equations is established. Using ergodicity, exponential dichotomy and Bi-almost automorphicity on the homogeneous part, sufficient conditions for ...
    • Millimeter-wave Line Ratios and Sub-beam Volume Density Distributions 
      Leroy, Adam K.; Usero, Antonio; Schruba, Andreas; Bigiel, Frank; Kruijssen, J. M.Diederik; Kepley, Amanda; Blanc Mendiberri, Guillermo; Bolatto, Alberto D.; Cormier, Diane; Gallagher, Molly; Hughes, Annie; Jiménez Donaire, María J.; Rosolowsky, Erik; Schinnerer, Eva (IOP Publishing, 2017)
      We explore the use of mm-wave emission line ratios to trace molecular gas density when observations integrate over a wide range of volume densities within a single telescope beam. For observations targeting external galaxies, ...
    • Assessing the accuracy of sequential gaussian simulation through statistical testing 
      Safikhani, Mohammad; Asghari, Omid; Emery, Xavier (Springer, 2017)
      Sequential Gaussian simulation is one of the most widespread algorithms for simulating regionalized variables in the earth sciences. Simplicity and flexibility of this algorithm are the most important reasons that make it ...
    • A revised planetary nebula luminosity function distance to NGC 628 using muse 
      Kreckel, K.; Groves, B.; Bigiel, F.; Blanc Mendiberri, Guillermo; Kruijssen, J. M.D.; Hughes, A.; Schruba, A.; Schinnerer, E. (IOP Publishing, 2017)
      Distance uncertainties plague our understanding of the physical scales relevant to the physics of star formation in extragalactic studies. The planetary nebulae luminosity function (PNLF) is one of very few techniques that ...
    • A new DNA cryptosystem based on AG codes evaluated in gaussian channels 
      Jirón, Iván; Soto, I.; Azurdia Meza, César; Valencia, A.; Carrasco, R. (Springer, 2017)
      This paper proposes a new cryptosystem sys-tem that combines DNA cryptography and algebraic curvesdefined over different Galois fields. The security of the pro-posed cryptosystem is based on the combination of DNAencoding, ...
    • Kinematics of the active West Andean fold-and-thrust belt (central Chile): Structure and long-term shortening rate 
      Riesner, M.; Lacassin, R.; Simoes, M.; Armijo, R.; Rauld, R.; Vargas, G. (Blackwell, 2017)
      West verging thrusts, synthetic with the Nazca-South America subduction interface, have beenrecently discovered at the western front of the Andes. At ~33°300S, the active San Ramón fault stands asthe most frontal of these ...
    • Mass–metallicity relation for local analogs of high-redshift galaxies: implicationsfor the evolution of the ... 
      Bian, Fuyan; Kewley, Lisa J.; Dopita, Michael A.; Blanc Mendiberri, Guillermo (Institute of Physics, 2017)
      We revisit the evolution of the mass–metallicity relation of low- and high-redshift galaxies by using a sample oflocal analogs of high-redshift galaxies. These analogs share the same location of the UV-selected ...
    • Effects of hypertension and pressure gradient in a human cerebral aneurysm using fluid structure interaction ... 
      Valencia Musalem, Álvaro; Torres, Francisco (World Scientific, 2017)
      Fluid-structure interaction (FSI) simulations were carried out in a human cerebral aneurysm model with the objective of quantifying the effects of hypertension and pressure gradient on the behavior of fluid and solid ...
    • An enhanced representation of thermal faces for improving local appearance-based face recognition 
      Hermosilla, Gabriel; Ruiz del Solar, Javier; Verschae, Rodrigo (Taylor and Francis, 2017)
      This paper proposes a new methodology to improve appearance-based thermal face recognition methods by using an enhanced representation of the thermal face information. This new representation is obtained by combining the ...
    • Distance measures, weighted averages, OWA operators and Bonferroni means 
      Merigó Lindahl, José; Palacios Marqués, Daniel; Soto Acosta, Pedro (Elsevier, 2017)
      The ordered weighted average (OWA) is an aggregation operator that provides a parameterized family of operators between the minimum and the maximum. This paper presents the OWA weighted average distance operator. The main ...
    • Embedded heterogeneous feature selection for conjoint analysis: A SVM approach using L1 penalty 
      Maldonado, Sebastián; Montoya Moreira, Ricardo; López, Julio (Springer, 2017)
      This paper presents a novel embedded feature selection approach for Support Vector Machines (SVM) in a choice-based conjoint context. We extend the L1-SVM formulation and adapt the RFE-SVM algorithm to conjoint analysis ...
    • Matching colored points with rectangles 
      Caraballo, L. E.; Ochoa, C.; Pérez Lantero, P.; Rojas Ledesma, J. (Springer, 2017)
      Let S be a point set in the plane such that each of its elements is colored either red or blue. A matching of S with rectangles is any set of pairwise-disjoint axis-aligned closed rectangles such that each rectangle contains ...
    • Control of deviations and prediction of surface roughness from micro machining of THz waveguides using ... 
      Griffin, James M.; Díaz, Fernanda; Geerling, Edgar; Clasing, Matías; Ponce, Vicente; Taylor, Chris; Turner, Sam; Michael, Ernest; Mena Mena, Fausto Patricio; Bronfman Aguiló, Leonardo (Academic Press-Elsevier, 2017)
      By using acoustic emission (AE) it is possible to control deviations and surface quality during micro milling operations. The method of micro milling is used to manufacture a submillimetre waveguide where micro machining ...
    • Chi-squared smoothed adaptive particle-filtering based prognosis 
      Ley, Christopher P.; Orchard Concha, Marcos (Academic Press-Elsevier, 2017)
      This paper presents a novel form of selecting the likelihood function of the standard sequential importance sampling/re-sampling particle filter (SIR-PF) with a combination of sliding window smoothing and chi-square statistic ...
    • Cavity and other radial substructures in the disk around HD 97048 
      Van Der Plas, G.; Wright, C. M.; Ménard, F.; Casassus Montero, Simón; Cánovas, H.; Pinte, C.; Maddison, S. T.; Maaskant, K.; Avenhaus, H.; Cieza, L.; Pérez, S.; Ubach, C. (EDP Sciences, 2017)
      Context. Gaps, cavities, and rings in circumstellar disks are signposts of disk evolution and planet-disk interactions. We follow the recent suggestion that Herbig Ae/Be disks with a flared disk harbor a cavity, and ...
    • Linear elastic fracture simulation directly from CAD: 2D NURBS-based implementation and role of tip enrichment 
      Peng, X.; Atroshchenko, E.; Kerfriden, P.; Bordas, S. P.A. (Springer, 2017)
      We propose a method for simulating linear elastic crack growth through an isogeometric boundary element method directly from a CAD model and without any mesh generation. To capture the stress singularity around the crack ...
    • Antarctic ice sheet discharge driven by atmosphere-ocean feedbacks at the Last Glacial Termination 
      Fogwill, C. J.; Turney, C. S. M.; Golledge, N. R.; Etheridge, D. M.; Rubino, M.; Thornton, D. P.; Baker, A.; Woodward, J.; Winter, K.; Van Ommen, T. D.; Moy, A. D.; Curran, M. A. J.; Davies, S. M.; Weber, M. E.; Bird, M. I.; Munksgaard, N. C.; Menviel, L.; Rootes, C. M.; Ellis, B.; Millman, H.; Vohra, J.; Rivera, A.; Cooper, A. (Nature, 2017)
      Reconstructing the dynamic response of the Antarctic ice sheets to warming during the Last Glacial Termination (LGT; 18,000-11,650 yrs ago) allows us to disentangle ice-climate feedbacks that are key to improving future ...
    • A search for pre- and proto-brown dwarfs in the dark cloud Barnard 30 with ALMA 
      Huélamo, N.; De Gregorio Monsalvo, Itziar; Palau, A.; Barrado, D.; Bayo, A.; Ruíz González, María Teresa; Zapata, L.; Bouy, H.; Morata, O.; Morales Calderón, M.; Eiroa, C.; Ménard, F. (EDP Sciences, 2017)
      Context.The origin of brown dwarfs is still under debate. While some models predict a star-like formation scenario, others invokea substellar mass embryo ejection, a stellar disk fragmentation, or the photo-evaporation of ...
    • Time-optimal top-k document retrieval 
      Navarro, Gonzalo; Nekrich, Yakov (Society for Industrial and Applied Mathematics, 2017)
      LetDbe a collection ofDdocuments, which are strings over an alphabet of sizeσ,of total lengthn. We describe a data structure that uses linear space and reportskmost relevantdocuments that contain a query patternP, which ...
    • A Type II Supernova Hubble Diagram from the CSP-I, SDSS-II, and SNLS Surveys 
      Jaeger, T. De; González Gaitán, S.; Hamuy Wackenhut, Mario; Galbany, Lluis; Anderson, J. P.; Phillips, M. M.; Stritzinger, M. D.; Carlberg, R. G.; Sullivan, M.; Gutiérrez, C. P.; Hook, I. M.; Howell, D. Andrew; Hsiao, E. Y.; Kuncarayakti, H.; Ruhlmann-Kleider, V.; Folatelli, Gastón; Pritchet, C.; Basa, S. (Institute of Physics Publishing, 2017)
      The coming era of large photometric wide-field surveys will increase the detection rate of supernovae by orders of magnitude. Such numbers will restrict spectroscopic follow-up in the vast majority of cases, and hence new ...