Repositorio Académico de la Universidad de Chile: Recent submissions

Now showing items 35261-35280 of 98570

    • Near-infrared spectroscopic observations of high redshift C I absorbers 
      Zou, Siwei; Petitjean, Patrick; Noterdaeme, Pasquier; Ledoux, Cédric; Krogager, J. K.; Fathivavsari, H.; Srianand, R.; López, S. (EDP Sciences, 2018)
      We study a sample of 17 $z>1.5$ C~{\sc i} absorbers observed with the ESO-VLT spectrograph X-SHOOTER. We derive metallicities, depletion onto dust, extinction by dust and analyse the absorption from Mg~{\sc ii}, Mg~{\sc ...
    • A more general theory of static approximations for conjunctive queries 
      Barceló, Pablo; Romero, Miguel; Zeume, Thomas (Schloss Dagstuhl- Leibniz-Zentrum fur Informatik GmbH, Dagstuhl Publishing, 2018)
      Conjunctive query (CQ) evaluation is NP-complete, but becomes tractable for fragments of bounded hypertreewidth. Approximating a hard CQ by a query from such a fragment can thus allow for an efficient approximate evaluation. ...
    • A high-speed tracking algorithm for dense granular media 
      Cerda, Mauricio; Navarro, Cristóbal; Silva, Juan; Waitukaitis, Scott; Mujica, Nicolás; Hitschfeld, Nancy (Elsevier B.V., 2018)
      Many fields of study, including medical imaging, granular physics, colloidal physics, and active matter, require the precise identification and tracking of particle-like objects in images. While many algorithms exist to ...
    • Imaging the Laguna del Maule Volcanic Field, central Chile using magnetotellurics: Evidence for crustal ... 
      Cordell, Darcy; Unsworth, Martyn; Díaz, Daniel (Elsevier B.V., 2018)
      Magnetotelluric (MT) data were collected at the Laguna del Maule volcanic field (LdMVF), located in central Chile (36◦S, 70.5◦W), which has been experiencing unprecedented upward ground deformation since 2007. These data ...
    • Damage assessment in a sandwich panel based on full-field vibration measurements 
      Seguel, F.; Meruane Naranjo, Viviana (Academic Press, 2018)
      Different studies have demonstrated that vibration characteristics are sensitive to debonding in composite structures. Nevertheless, one of the main restrictions of vibration measurements is the number of degrees of ...
    • Experimental seismic shear force amplification in scaled RC cantilever shear walls with base irregularities 
      Jiménez, Francisco; Massone, Leonardo (Springer Netherlands, 2018)
      RC structural slender walls under large seismic excitation are expected to reach base moment capacity mainly affected by the first vibration mode. However, the base shear could be affected by higher modes once yielding in ...
    • Analytical model for shear strength estimation of reinforced concrete beam-column joints 
      Massone, Leonardo; Orrego, Gonzalo (Elsevier Ltd, 2018)
      A model capable of predicting the shear response of beam-column joints subjected to seismic actions is presented. The analytical model, originally developed for walls and based on a simple physical formulation, is adapted. ...
    • Electronic and thermal properties of non-stoichiometric and doped cobaltum antimonide 
      Velasco-Soto, Diego; Menéndez Proupin, Eduardo; Realyvazquez-Guevara, Rebeca; Matutes-Aquino, José (Institute of Physics Publishing, 2018)
      The electronic, vibrational and thermal properties of stoichiometric and non-stoichiometric cobalt antimonide CoSb x (x = 2.81, 2.875, and 3) are investigated by means of first principle calculations and thermal measurements. ...
    • Quality of lettuce (Lactuca sativa L.) grown in aquaponic and hydroponic systems 
      Alcarraz, E.; Flores, M.; Tapia, M. L.; Bustamante, A.; Wacyk, J.; Escalona Contreras, Víctor (International Society for Horticultural Science, 2018)
      Aquaponics is the integration of aquaculture and hydroponic systems where, in general terms, the waste produced by aquatic organisms becomes nutrients through bacterial action for plant growth. Water consumption as well ...
    • Ozone applied to the nutrient solution and its impact on red chard baby leaves yield 
      Machuca, A.; Odio, A.; Tapia, M. L.; Silveira, A. C.; Escalona Contreras, Víctor (International Society for Horticultural Science, 2018)
      Safety of fresh-cut products is largely affected by the microbial load of raw material. In this sense, a hydroponic production system allows to reduce microbial contamination, as long as the quality of the used water on ...
    • Effect of NaCl concentration and UV-B on lettuce crop in hydroponic system 
      Vanegas, D.; Flores, M.; Tapia, M. L.; Mercado Silva, E.; Escalona Contreras, Víctor (International Society for Horticultural Science, 2018)
      Vegetable consumption has increased in recent years, so it is imperative for the industry to fill expectations in terms of convenience, taste and product quality. Consumers are looking for freshness and soft textures, so ...
    • Olive inflorescence and flower development as affected by irradiance received in different positions of an ... 
      Moreno Alías, Inmaculada; Trentacoste, Eduardo R.; Gómez del Campo, María; Beyá Marshall, Víctor Manuel; Rapoport, Hava F. (International Society for Horticultural Science, 2018)
      Olive lree productivity is highly respons1ve to radiation condit10ns, so understanding the responses of the developmental processes that determine yield, among these inflorescence and flower differentiation, is essenllal ...
    • Effect of postharvest calcium treatments on firmness of guava fruit 
      Alba Jiménez, J. E.; Vázquez Barrios, M. E.; Rivera Pastrana, D. M.; Escalona Contreras, Víctor; Mercado Silva, E. (International Society for Horticultural Science, 2018)
      The effects of different chelated glycine calcium solutions on the quality and firmness fruit of guava fruit (Psidium guajava L.) were studied. Five sets of 45 fruits of 'Media China′ guava were submerged in different ...
    • Effect of calcium and anti-browning agents on total phenols and antioxidant capability of 'Packham's Triumph' ... 
      Mery, L.; Obando Ulloa, J. M.; Machuca, A.; Luchsinger Lagos, Luis; Escalona Contreras, Víctor; Gil, M. I. (International Society for Horticultural Science, 2018)
      The effect of calcium propionate (PCa) 1% p/v, ethylenediaminetetraacetic acid (EDTA) 0.1% p/v, cysteine (CIS) 0.5% p/v and citric acid (AC) 0.5% p/v were evaluated on the total phenol content, antioxidant capability and ...
    • Survey of the types of stowage used in refrigerated containers for the transport of export fresh fruit 
      Luchsinger Lagos, Luis; Escalona Contreras, Víctor; Montenegro, J. P.; Lizana, L. A. (International Society for Horticultural Science, 2018)
      The maintenance of cold chain and temperature uniformity during transport of fresh fruit are critical factors to extend shelf life and maintain quality to reach distant international markets. The types of load patterns in ...
    • Effect of the transport vibration on the generation of the color reversion in blackberry fruit 
      Pérez Pérez, G. A.; Fabela Gallegos, M. J.; Vázquez Barrios, M. E.; Rivera Pastrana, D. M.; Palma Tirado, L.; Mercado Silva, E.; Escalona Contreras, Víctor (International Society for Horticultural Science, 2018)
      Mexico provides 95% of the export market blackberry (Rubus fruticosus) worldwide. The characteristic black color of this fruit is an important quality factor. During its postharvest management, it can reverse its color ...
    • Cutting and temperature of preservation effect on the physiological activity and quality of fresh cut ... 
      Oyarzún, A.; Obando Ulloa, J. M.; Mery, L.; Machuca, A.; Escalona Contreras, Víctor; Silveira, A. C. (International Society for Horticultural Science, 2018)
      The aim of this work was to evaluate the effect of wedge and dice cut format and storage temperature on the physiological activity, firmness and organic acid and sugar content of fresh cut pears (Pyrus communis L.) 'Packham's ...
    • Effect of alternative sanitizers on functional parameters of watercress leaves (Nasturtium officinale) ... 
      Verdugo, M.; Ospina, M.; Hinojosa, A.; Char, C.; Machuca, A.; Escalona Contreras, Víctor (International Society for Horticultural Science, 2018)
      Currently in the industry of fresh salads, watercress is shown as an alternative supply of gourmet products, being recognized for its high content of health promoting compounds such as antioxidants and phenolic compounds. ...
    • Competitive Peruvian and Chilean avocado export profile 
      Schwartz, M.; Maldonado, Y.; Luchsinger Lagos, Luis; Lizana, L. A.; Kern Falcón, Werther (International Society for Horticultural Science, 2018)
      In the last 10 years, Peru has increased planting areas and exports volume on 'Hass' avocado becoming an emerging important factor in the international market. In those conditions, it has started to compete with Chile, the ...
    • Interactive machine learning applied to dribble a ball in soccer with biped robots 
      Celemin, Carlos; Pérez Dattari, Rodrigo; Ruiz del Solar, Javier; Veloso, Manuela (Springer Verlag, 2018)
      An Interactive Machine Learning (IML) approach for training a dribbling engine for humanoid biped robots in RoboCup competitions (Standard Platform League) is presented. The proposed dribbling approach solves two decision ...