Now showing items 1-20 of 78

    • A hydrodynamical model for relativistic spin quantum plasmas 

      Asenjo, Felipe A.; Muñoz Gálvez, Víctor; Valdivia Hepp, Juan; Mahajan, Swadesh M. (AMER INST PHYSICS, 2011-01)
      Based on the one-body particle-antiparticle Dirac theory of electrons, a set of relativistic quantum fluid equations for a spin half plasma is derived. The particle-antiparticle nature of the relativistic particles is ...
    • A system dynamics model of the nutritional stages of the Colombian population 

      Meisel, José D.; Sarmiento, Olga; Olaya, Camilo; Valdivia Hepp, Juan; Zarama, Roberto (Emerald, 2016)
      Purpose - Overweight, obesity, and physical inactivity have in recent years become an important public health problem worldwide. Investigations that study obesity using a systemic approach in low- and middle-income countries ...
    • Ab Initio Molecular Dynamics Simulations of Ti-2 on C-20 Collisions and C20Ti2 Configurations 

      Muñoz, Francisco; Cárdenas Valencia, Carlos; José, Rogan; Valdivia Hepp, Juan; Fuentealba Rosas, Patricio; Kiwi Tichauer, Miguel (ACS Publications, 2013-02-28)
      The dynamics of the collision process of a titanium dimer against a C-20 nanocluster in the bowl configuration is simulated by means ab initio molecular dynamics, focusing our interest on the first steps to synthesize ...
    • Ab initio molecular dynamics simulations of Ti2 on C 20 collisions and C20Ti2 configurations 

      Muñoz, Francisco; Cardenas, Carlos; Rogan Castillo, José; Valdivia Hepp, Juan; Fuentealba Rosas, Patricio; Kiwi Tichauer, Miguel (2013)
      The dynamics of the collision process of a titanium dimer against a C 20 nanocluster in the bowl configuration is simulated by means ab initio molecular dynamics, focusing our interest on the first steps to synthesize ...
    • Asymptotic, non-linear solutions for ambipolar diffusion in one dimension 

      Hoyos, Jaime H.; Reisenegger, Andreas; Valdivia Hepp, Juan (WILEY-BLACKWELL, 2010-06-22)
      We study the effect of the non-linear process of ambipolar diffusion (joint transport of magnetic flux and charged particles relative to neutral particles) on the long-term behaviour of a non-uniform magnetic field in a ...
    • Au13-nAgn clusters: a remarkably simple trend 

      Muñoz, Francisco; Varas, Alejandro; Rogan Castillo, José; Valdivia Hepp, Juan; Kiwi Tichauer, Miguel (Royal Soc Chemistry, 2015)
      The planar to three dimensional transition of Au13-nAgn clusters is investigated. To do so the low lying energy configurations for all possible concentrations (n values) are evaluated. Many thousands of possible conformations ...
    • Bending energy of 2D materials: graphene, MoS2 and imogolite 

      Gonzalez, Rafael I.; Valencia, F.; Rogan Castillo, José; Valdivia Hepp, Juan; Sofo, Jorge; Kiwi Tichauer, Miguel; Muñoz, Francisco (Royal Soc Chemistry, 2018)
      The bending process of 2D materials, subject to an external force, is investigated, and applied to graphene, molybdenum disulphide (MoS2), and imogolite. For graphene we obtained 3.43 eV angstrom(2) per atom for the bending ...
    • Binary cluster collision dynamics and minimum energy conformations 

      Muñoz, Francisco; Rogan Castillo, José; Valdivia Hepp, Juan; Varas, A.; Kiwi Tichauer, Miguel (Elsevier, 2013)
    • Cellular automaton model for evacuation process with obstacles 

      Varas, A.; Cornejo, M. D.; Mainemer, D.; Toledo Cabrera, Benjamín; Rogan Castillo, José; Muñoz Gálvez, Víctor; Valdivia Hepp, Juan (2007)
      A bidimensional cellular automaton model is used to simulate the process of evacuation of pedestrians in a room with fixed obstacles. A floor field is defined so that moving to a cell with lower floor field means approaching ...
    • Characterization of the nontrivial and chaotic behavior that occurs in a simple city traffic model 

      Villalobos, J.; Toledo Cabrera, Benjamín; Pastén, D.; Muñoz Gálvez, Víctor; Rogan Castillo, José; Zarama, R.; Lammoglia, N.; Valdivia Hepp, Juan (2010)
      Urban traffic is interesting not only due to its obvious social and economical impact, but also due to its complexity. It is not unusual for drivers to get stuck in a traffic jam that apparently emerged from nowhere. ...
    • Circularly polarized wave propagation in magnetofluid dynamics for relativistic electron-positron plasmas 

      Asenjo, Felipe A.; Muñoz, Víctor; Valdivia Hepp, Juan; Hada, Tohru (2009)
      The dispersion relation for circularly polarized electromagnetic waves propagating in the direction of an external magnetic field in a relativistic electron-positron plasma with arbitrary constant drift velocities is ...
    • City traffic jam relief by stochastic resonance 

      Castillo, F.; Toledo Cabrera, Benjamín; Muñoz Gálvez, Víctor; Rogan Castillo, José; Zarama, R.; Kiwi Tichauer, Miguel; Valdivia Hepp, Juan (Elsevier, 2014)
      We simulate traffic in a city by means of the evolution of a row of interacting cars, using a cellular automaton model, in a sequence of traffic lights synchronized by a ‘‘green wave’’. When our initial condition is a ...
    • Collisions between a single gold atom and 13 atom gold clusters: an ab initio approach 

      Muñoz, F.; Rogan Castillo, José; García, G.; Ramírez, M.; Valdivia Hepp, Juan; Ramírez, R.; Kiwi Krauskopf, Marcos (SPRINGER, 2011-01)
      Collision processes between a single gold atom and a gold cluster are investigated by means of ab initio techniques. The targets we consider are minimum energy 13 gold atom clusters. The kinetic energy of the projectile ...
    • Contribution of Latin–American scientists to the study of the magnetosphere of the Earth. A review 

      Stepanova, M.; Valdivia Hepp, Juan (Elsevier, 2016)
      Since the very beginning of the space era, Latin–American scientists have been contributing to the understanding of the magnetosphere of the Earth. This review summarizes some significant contributions in this field with ...
    • Controlling the quantum state with a time varying potential 

      Carrasco, Sebastián; Rogan Castillo, José; Valdivia Hepp, Juan (Nature Publishing Group, 2017)
      The problem of controlling the quantum state of a system is investigated using a time varying potential. As a concrete example we study the problem of a particle in a box with a periodically oscillating infinite square-well ...
    • Critical behavior in earthquake energy dissipation 

      Wanliss, James; Muñoz Gálvez, Víctor; Pastén Guzmán, Denisse; Toledo Cabrera, Benjamín; Valdivia Hepp, Juan (Springer, 2017)
      We explore bursty multiscale energy dissipation from earthquakes flanked by latitudes 29 degrees S and 35.5 degrees S, and longitudes 69.501 degrees W and 73.944 degrees W (in the Chilean central zone). Our work compares ...
    • Diversity Characterization of Binary Clusters by Means of a Generalized Distance 

      Ramírez González, Max; Rogan Castillo, José; Valdivia Hepp, Juan; Varas, Alejandro; Kiwi Tichauer, Miguel (Walter de Gruyter, 2016)
      We characterize, by means of the definition of a generalized distance, the differences and similarities between binary nanoclusters. To define analytically, and to compute numerically this distance, we have generalized an ...
    • Diversity driven unbiased search of minimum energy cluster configurations 

      Rogan Castillo, José; Ramírez, Max; Muñoz, Víctor; Valdivia Hepp, Juan; García, Griselda; Ramírez, Ricardo; Kiwi Tichauer, Miguel (2009)
      The determination of the spatial distributions that atoms adopt to form condensed matter is a problem of crucial importance, since most physical properties depend on the atomic arrangement. This is especially relevant for ...
    • Do Health Benefits Outweigh the Costs of Mass Recreational Programs? An Economic Analysis of Four Ciclovía Programs 

      Montes, Felipe; Sarmiento, Olga L.; Zarama, Roberto; Pratt, Michael; Wang, Guijing; Jacoby, Enrique; Schmid, Thomas L.; Ramos, Mauricio; Ruiz, Oscar; Vargas, Olga; Michel, Gabriel; Zieff, Susan G.; Valdivia Hepp, Juan; Cavill, Nick; Kahlmeier, Sonja (Springer, 2012-02)
      One promising public health intervention for promoting physical activity is the Ciclovia program. The Ciclovia is a regular multisectorial community-based program in which streets are temporarily closed for motorized ...
    • Efectos macroscópicos de las fluctuaciones en un baño bacteriano diluido 

      Parra Rojas, César Andrés (Universidad de Chile, 2012)
      Un baño bacteriano consiste en un fluido en el que nadan bacterias. Este nado produce agitaciones en el sistema, induciendo un campo de velocidades en él. En esta tesis, se presenta un estudio hidrodinámico de las ...