Now showing items 1-5 of 5

    • 18 Sco : a solar twin rich in refractory and neutron-capture elements, implications for chemical tagging 

      Meléndez, Jorge; Ramírez, Iván; Karakas, Amanda I.; Yong, David; Monroe, TalaWanda Rose; Bedell, Megan; Bergemann, Maria; Asplund, Martin; Maia, Marcelo Tucci; Bean, Jacob L.; Nascimento Júnior, José Dias do; Bazot, Michael; Alves-Brito, Alan; Freitas, Fabrício Catani de; Castro, Matthieu Sébastien (2014) [Journal article]
      We study with unprecedented detail the chemical composition and stellar parameters of the solar twin 18 Sco in a strictly differential sense relative to the Sun. Our study is mainly based on high-resolution (R ∼ 110,000), ...
    • Chaotic interaction of langmuir solitons and long wavelength radiation 

      Erichsen Junior, Rubem; Oliveira, Glaucius Iahnke de; Rizzato, Felipe Barbedo (1998) [Journal article]
      In this work we analyze the interaction of isolated solitary structures and ion-acoustic radiation. If the radiation amplitude is small solitary structures persist, but when the amplitude grows energy transfer towards small ...
    • Heuristic model for the energy spectrum of phase turbulence 

      Medeiros, Joacir Thadeu Nascimento; Simoes, Acirete Souza da Rosa (2001) [Journal article]
      We present a heuristic model for the energy spectrum of the one-dimensional phase turbulence in the steady state of the Kuramoto-Sivashinsky equation. Our model contains an energy transfer mechanism from low- to high-wave-vector ...
    • Particle-in-cell and weak turbulence simulations of plasma emission 

      Lee, Sang-Yun; Ziebell, Luiz Fernando; Yoon, Peter H.; Gaelzer, Rudi; Lee, Ensang (2019) [Journal article]
      The plasma emission process, which is the mechanism for solar type II and type III radio burst phenomena, is studied by means of particle-in-cell (PIC) and weak turbulence (WT) simulation methods. “Plasma emission” is meant ...
    • Solitons, chaos, and energy transfer in the Zakharov equations 

      Rizzato, Felipe Barbedo; Oliveira, Glaucius Iahnke de; Erichsen, Ronaldo (1998) [Journal article]
      In the present paper we investigate the process of energy transfer in the Zakharov equations. Energy is initially injected into modes with small wave vectors. When the modulational instability threshold is exceeded, some ...