Repositorio Académico de la Universidad de Chile: Recent submissions

Now showing items 35761-35780 of 98780

    • A submillimeter study of the IR dust bubble s 21 and its environs 
      Cappa, Cristina; Duronea, Nicolas; Vasquez, Javier; Rubio, M.; Firpo, V.; López-Caraballo, C.; Borissova, J. (Universidad Nacional Autonoma de Mexico, 2017)
      Based on the molecular emission in the 12CO(2-1) and 13CO(2-1) lines, and on the continuum emission in the MIR and FIR towards the S 21 IR dust bubble, we analyze the physical characteristics of the gas and dust linked to ...
    • Chilean underground mine dataset 
      Leung, Keith; Lühr, Daniel; Houshiar, Hamidreza; Inostroza Allende, Luis Felipe; Borrmann, Dorit; Adams, Martin; Nüchter, Andreas; Ruiz del Solar, Javier (SAGE, 2017)
      This article presents a robotic dataset collected from the largest underground copper mine in the world. The sensor mea-surements from a 3D scanning lidar, a 2D radar, and stereo cameras were recorded from an approximately ...
    • Confinement behavior of rectangular reinforced concrete prisms simulating wall boundary elements 
      Welt, Travis S.; Massone Sánchez, Leonardo; Lafave, James M.; Lehman, Dawn E.; McCabe, Steven L.; Polanco, Pablo (American Society of Civil Engineers (ASCE), 2017)
      Observations following recent earthquakes, and from structural testing, indicate numerous brittle compression failures in rein-forced concrete seismic-resisting walls. This is unexpected, as most seismic-resisting walls ...
    • An Enhanced dq-Based Vector Control System for Modular Multilevel Converters Feeding Variable-Speed Drives 
      Espinoza, Mauricio; Cárdenas Dobson, Jesús; Díaz, Matías; Clare, Jon C. (IEEE, 2017)
      Modular multilevel converters (M2C) are considered an attractive solution for high power drive applications. However, energy balancing within the converter is complex to achieve, particularly when the machine is operating ...
    • Impact location and quantification on an aluminum sandwich panel using principal component analysis and ... 
      Meruane Naranjo, Viviana; Véliz, Pablo; López Droguett, Enrique; Ortiz Bernardín, Alejandro (MDPI, 2017)
      To avoid structural failures it is of critical importance to detect, locate and quantify impact damage as soon as it occurs. This can be achieved by impact identification methodologies, which continuously monitor the ...
    • Recovering Latent Signals from a Mixture of Measurements Using a Gaussian Process Prior 
      Tobar Henríquez, Felipe; Ríos, Gonzalo; Valdivia, Tomás; Guerrero, Pablo (IEEE, 2017)
      In sensing applications, sensors cannot always mea-sure the latent quantity of interest at the required resolution, some-times they can only acquire a blurred version of it due the sensor’stransfer function. To recover ...
    • Characterization of spatiotemporal chaos in a Kerr optical frequency comb and in all fiber cavities 
      Liu, Z.; Ouali, M.; Coulibaly, S.; Clerc Gavilán, Marcel; Taki, M.; Tlidi, M. (OSA - The Optical Society, 2017)
      Complex spatiotemporal dynamics have been a subject of recent experimental investigations in optical frequency comb microresonators and in driven fiber cavities with Kerr-type media. We show that this complex behavior has ...
    • Relaxation processes after instantaneous shear rate reversal in a dense granular flow 
      Rojas, Eduardo; Soto Bertrán, Rodrigo; Clement, Eric; Trulsson, Martin; Andreotti, Bruno (EDP Sciences, 2017)
      A numerical model of granular material at different packing fractions and under steady shear is submitted to a sudden shear reversal. We monitor consequences of the strong density and shear rate spatiotemporal heterogeneities, ...
    • Implicit equations for thermoelastic bodies 
      Bustamante Plaza, Roger; Rajagopal, K. R. (Elsevier, 2017)
      In this paper we generalize the recent implicit models that have been put into place to describe the elastic response of bodies when thermal effects come into play. The implicit constitutive relations for thermoelastic ...
    • Modelling age replacement policy under multiple time scales and stochastic usage profiles 
      Díaz, Nicole; Pascual, Rodrigo; Ruggeri, Fabrizio; López Droguett, Enrique (Elsevier, 2017)
      This paper offers an original methodology to set multi-dimensional maintenance policies for machines whose aging processes require using multiple time scales. It can be considered a generalization of the traditional approach, ...
    • Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line ... 
      Pei, L.; Fausnaugh, M. M.; Barth, A. J.; Peterson, B. M.; Bentz, M. C.; Rosa, G. de; Denney, K. D.; Goad, M. R.; Kochanek, C. S.; Korista, K. T.; Kriss, G. A.; Pogge, R. W.; Bennert, V. N.; Brotherton, M.; Clubb, K. I.; Dalla Bontà, E.; Filippenko, A. V.; Greene, J. E.; Grier, C. J.; Vestergaard, M.; Zheng, W.-K; Adams, Scott M.; Beatty, Thomas G.; Bigley, A.; Brown, Jacob E.; Brown, Jonathan S.; Canalizo, G.; Comerford, J. M.; Coker, Carl T.; Corsini, E. M.; Croft, S.; Croxall, K. V.; Deason, A. J.; Eracleous, Michael; Fox, O. D.; Gates, E. L.; Henderson, C. B.; Holmbeck, E.; Holoien, T. W.-S; Jensen, J. J.; Johnson, C. A.; Kelly, P. L.; Kim, S.; King, A.; Lau, M. W.; Li, Miao; Lochhaas, Cassandra; Ma, Zhiyuan; Manne-Nicholas, E. R.; Mauerhan, J. C.; Malkan, M. A.; McGurk, R.; Morelli, L.; Mosquera, Ana; Dale Mudd, Dale; Muller Sánchez, F.; Nguyen, M. L.; Ochner, P.; Ou-Yang, B.; Pancoast, A.; Penny, Matthew T.; Pizzella, A.; Poleski, Radoslaw; Runnoe, Jessie; Scott, B.; Schimoia, Jaderson S.; Shappee, B. J.; Shivvers, I.; Simonian, Gregory V.; Siviero, A.; Somers, Garrett; Stevens, Daniel J.; Strauss, M. A.; Tayar, Jamie; Tejos, Nicolás; Treu, T.; Van Saders, J.; Vican, L.; Villanueva, S.; Yuk, H.; Zakamska, N. L.; Zhu, W.; Anderson, M. D.; Arévalo, P.; Bazhaw, C.; Bisogni, S.; Borman, G. A.; Bottorff, M. C.; Brandt, W. N.; Breeveld, A. A.; Cackett, E. M.; Carini, M. T.; Crenshaw, D. M.; Lorenzo Cáceres, A. de; Dietrich, M.; Edelson, R.; Efimova, N. V.; Ely, J.; Evans, P. A.; Ferland, G. J.; Flatland, K.; Gehrels, N.; Geier, S.; Gelbord, J. M.; Grupe, D.; Gupta, A.; Hall, P. B.; Hicks, S.; Horenstein, D.; Horne, Keith; Hutchison, T.; Im, M.; Joner, M. D.; Jones, J.; Kaastra, J.; Kaspi, S.; Kelly, B. C.; Kennea, J. A.; Kim, M.; Kim, S. C.; Klimanov, S. A.; Lee, J. C.; Leonard, D. C.; Lira Teillery, Paulina; MacInnis, F.; Mathur, S.; McHardy, I. M.; Montouri, C.; Musso, R.; Nazarov, S. V.; Netzer, H.; Norris, R. P.; Nousek, J. A.; Okhmat, D. N.; Papadakis, I.; Parks, J. R.; Pott, J.-U.; Rafter, S. E.; Rix, H.-W.; Saylor, D. A.; Schnülle, K.; Sergeev, S. G.; Siegel, M.; Skielboe, A.; Spencer, M.; Starkey, D.; Sung, H.-I.; Teems, K. G.; Turner, C. S.; Uttley, P.; Villforth, C.; Weiss, Y.; Woo, J.-H.; Yan, H.; Young, S.; Zu, Y. (Institute of Physics Publishing, 2017)
      We present the results of an optical spectroscopic monitoring program targeting NGC 5548 as part of a larger multi-wavelength reverberation mapping campaign. The campaign spanned six months and achieved an almost daily ...
    • Operations research transforms the scheduling of chilean soccer leagues and south American world cup qualifiers 
      Alarcón, Fernando; Durán, Guillermo; Guajardo, Mario; Miranda Pino, Jaime; Muñoz, Hugo; Ramírez, Luis; Ramírez, Mario; Sauré Valenzuela, Denis; Siebert, Matías; Souyris, Sebastián; Weintraub Pohorille, Andrés; Wolf Yadlin, Rodrigo; Zamorano, Gonzalo (INFORMS, 2017)
      For the past 12 years, the Chilean Professional Soccer Association (ANFP) hasapplied operations research (OR) techniques to schedule soccer leagues in Chile. Usinginteger programming-based methods, the ANFP decides which ...
    • Control of a grinding mill circuit using fractional order controllers 
      Águila Camacho, Norelys; Le Roux, Johan D.; Duarte Mermoud, Manuel; Orchard Concha, Marcos (Elsevier, 2017)
      This paper presents the design and application of fractional single-input–single-output (SISO) controllers to a grinding mill circuit, which is a multiple-input–multiple-output (MIMO) process. Two kinds of controllers are ...
    • The complex, dusty narrow-line region of NGC 4388: Gas-jet interactions, outflows and extinction revealed ... 
      Rodríguez Ardila, A.; Mason, R. E.; Martins, L.; Ramos Almeida, C.; Riffel, R. A.; Riffel, R.; Lira Teillery, Paulina; González Martín, O.; Dametto, N. Z.; Flohic, H.; Ho, L. C.; Ruschel Dutra, D.; Thanjavur, K.; Colina, L.; McDermid, R. M.; Perlman, E.; Winge, C. (Oxford University, 2017)
      We present Gemini/GNIRS (Gemini Near-Infrared Spectrograph) spectroscopy of the Seyfert2 galaxy NGC 4388, with simultaneous coverage from 0.85 to 2.5μm. Several spatiallyextended emission lines are detected for the first ...
    • Compressed Dynamic Range Majority Data Structures 
      Gagie, Travis; He, Meng; Navarro, Gonzalo (Institute of Electrical and Electronics Engineers Inc., 2017)
      In the range α-majority query problem, we preprocess a given sequence S[1.n] for a fixed threshold α ϵ (0, 1], such that given a query range [i.j], the symbols that occur more than α (j-i+1) times in S[i.j] can be reported ...
    • Spatiotemporal analysis of the atmospheric and surface urban heat islands of the Metropolitan Area of Toluca, ... 
      Rivera, Erika; Antonio Némiga, Xanat; Origel Gutiérrez, Gabriel; Sarricolea Espinoza, Pablo; Adame Martínez, Salvador (Springer, 2017)
      The dynamic of consolidation of urban areas inLatin America has allowed that almost 80% of the popula-tion concentrates in cities; this has produced changes in landcovers and modified regional climate, propitiating ...
    • A new VLC system for localization in underground mining tunnels 
      Iturralde, Daniel; Seguel, Fabian; Soto, Ismael; Azurdia Meza, César; Khan, Salman (IEEE, 2017)
      In this paper we present a new system that uses new technology that has the ability to transmit data using light emitting diodes (LED) and a photodetector (PD) capable of sensing very soft changes of light. The system ...
    • Low-PAPR Hybrid Filter for SC-FDMA 
      Kamal, Shaharyar; Azurdia Meza, César; Tran, Nguyen H.; Lee, Kyesan (IEEE, 2017)
      We propose a hybrid filter to reduce the peak-to-average power ratio (PAPR) on the transmitter side in a long-term evolution uplink scheme. The design of the proposed filter is based on two key components: a finite impulse ...
    • Rate of convergence to equilibrium of fractional driven stochastic differential equations with some ... 
      Fontbona Torres, Joaquín; Panloup, Fabien (Institute of Mathematical Statistics, 2017)
      We investigate the problem of the rate of convergence to equilibrium for ergodic stochastic differential equations driven by fractional Brownian motion with Hurst parameterH >1/2 and multiplicative noise component σ. ...
    • Purification and characterization of a novel cold adapted fungal glucoamylase 
      Carrasco, Mario; Alcaíno Gorman, Jennifer; Cifuentes Guzmán, Víctor; Baeza Cancino, Marcelo (BioMed Central, 2017)
      Background: Amylases are used in various industrial processes and a key requirement for the efficiency of these processes is the use of enzymes with high catalytic activity at ambient temperature. Unfortunately, most ...