Now showing items 1-10 of 470
Mid-Holocene climate and culture change in the Atacama Desert, Northern Chile
(Academic Press Inc., 1997)
Twenty archaeological campsites intercalated between more than 30 debris flows caused by heavy rainfall events between 6200 and 3100 14C yr B.P. have recently been discovered at Quebrada Puripica in the Atacama Desert of ...
Ion acoustic instability triggered by finite amplitude polarized waves in the solar wind
(Blackwell Publishing Ltd, 2005)
 It is shown that ion-acoustic waves propagating along an external magnetic field and generated by parametric decays of circularly polarized finite amplitude waves have the properties of ion-acoustic waves observed ...
Late quaternary vegetation of southern Isla Grande de Chiloé, Chile
Late-glacial-Holocene forest history of southern Isla Chiloé (latitude 43°10′ S) was reconstructed on the basis of pollen analysis in three profiles (Laguna Soledad, Laguna Chaiguata, Puerto Carmen). Prior to 12,500 yr ...
Study of Er3+ fluorescence on tellurite glasses containing Ag nanoparticles
Optical characteristics of tellurite glasses containing silver nanoparticles (NPs) and the influence on the emission spectrum of Er 3+ ions were studied. The transitions 4f ↔ 4f from erbium ions, mainly the 4I13/2 → 4I15/2 ...
Espacio público y movimientos sociales: entrevista con Dr. Don Mitchell
(Pontificia Universidad Católica de Chile, 2013)
Feeding and foraging behaviour of alpaca in northern Chile
Alpaca play a primary role in the Andean peasant economy. Major constraints to productivity include lack of knowledge of relations between reproduction and nutrition and of the potential of alpaca outside their normal ...
Solar reflectors about the Sun-Earth artificial collinear equilibrium points
Simple climate models help to explain the natural variability of the Earth's climate system. These models show that Earth's climate can switch from a stable warm state to a cool state and is sensitive to relative small ...
Self-organized criticality in the substorm phenomenon and its relation to localized reconnection in the magnetospheric plasma sheet
(Blackwell Publishing Ltd, 2000)
Evidence is presented that suggests that there is a significant self-organized criticality (SOC) component in the dynamics of substorms in the magnetosphere. We assume that observations of bursty bulk flows, fast flows, ...