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Browsing Artículos de conferencia by Subject "07 Energía asequible y no contaminante"
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- ItemApproaches to USJ Formation Beyond Molecular Implantation(2008) Hatem, C.; Renau, A.; Godet, L.; Kontos, A.; Papasouliotis, G.; England, J.; Arévalo, Edward
- ItemElectron beam effects on amorphous molybdenum oxide nanostructures grown by condensation in hydrogen(2008) Díaz Droguett, Donovan Enrique; Fuenzalida, V.M.; Diaz-Espinoza, M.S.; Solorzano, G.
- ItemEnabling Solutions for 28nm CMOS Advanced Junction Formation(2010) Li, C.I.; Kuo, P.; Lai, H.H.; Ma, K.; Liu, R.; Wu, H.H.; Chan, M.; Yang, C.L.; Wu, J.Y.; Arévalo, Edward; Guo, B.N.; Colombeau, B.; Thirumal, T.; Toh, T.; Shim, K.H.; Sun, H.L.; Wu, T.; Lu, S.
- ItemImplementation of moiré-schlieren deflectometry on a small scale fast capillary plasma discharge(2012) Valenzuela Ahumada, Julio César; Wyndham, Edmund; Chuaqui, Hernán; Cortes, D.S.; Favre Domínguez, Mario; Bhuyan, Heman
- ItemPhysical modelling of diversion works for the aysén hydroelectric project Chile(2010) Gonzalez, Ricardo; Cienfuegos Carrasco, Rodrigo Alberto; Fernandez J., Bonifacio; Bravo, Jorge; Costas, Carlos; Garces, OctavioThe Aysen Hydroelectric Project considers the construction of 5 dams in the Baker and Pascua rivers in the southernmost part of Chile. Both rivers in the project area are characterized by narrow valleys, high slopes (> 1% -2%) and large streamflows that range between 600 and 800 m3/s during the low flow season. In order to study the diversion of the rivers, two scaled physical hydraulic models (1:70 for the Baker river and 1:60 for the Pascua river) were built at the Hydraulic Laboratory of the Pontificia Universidad Catolica de Chile to test different methods for cofferdam construction. In this study, we investigate the use of a combination of precast concrete elements such as cubes, tetracubes and tetrapods, along with the use of graduated soil and rock fills to produce a semiimpervious cofferdam. This report presents a summary of the experimental work conducted in the physical models, focusing on the final adopted solution which considers the use of 30 t tetrapods and graduated soil and rock fills to achieve impermeability of the cofferdams.
- ItemRefractive optical measurements on the Llampudken generator(AMER INST PHYSICS, 2006) Suzuki, Francisco; Veloso, Felipe; Molina, Francisco; Mitchell, Ian; Chuaqui, Hernan; Aliaga Rossel, Raul; Favre, Mario; Wyndham, Edmund; HerreraVelazquez, JJEExperiments with two different configurations of dense z-pinches have been carried out on the Llampudken generator with the objective of investigating the time evolution of the discharges. These configurations were studied with refractive optical measurements using the second harmonic of a Nd:YAG laser (10 ns FVVM lambda=532 run). The Llampudken generator delivered a pulse current of 450 kA with a 260 ns rise time. Refractive optical measurements with schlieren diagnostics were made using an optical system which provided two frames per discharge. The original beam was split into two separate beams with perpendicular polarizations using a polarizer beam splitter and an extra path length was introduced into one of the beams delaying it with respect to the other. The path through the discharge chamber was equal for both beams therefore providing identical views of the plasma at two different times. The images were recorded on 35mm cameras using suitably orientated polarizers to select the corresponding beam. As a complementary diagnostic technique, MCP cameras with exposure time of 2 ns were used to obtain VUV images of the loads. Preliminary results of these experiments will be presented and discussed.
- ItemThe formation of ring shaped laser plasmas on a metal surface(AMER INST PHYSICS, 2006) Veloso, Felipe; Chuaqui, Hernan; Aliaga Rossel, Raul; Favre, Mario; Mitchell, Ian; Wyndham, Edmund; HerreraVelazquez, JJEA method to produce ring plasmas on a metal surface is presented. The ring plasma is produced by focusing a laser pulse into an annular shape. This is achieved by using a combination of a converging lens and an axicon. The axicon is a rotationally symmetric prism. The radius of the focused ring is determined by the base angle of the axicon, and the focal length of the converging lens. The experiments are performed on a titanium surface, using a 0.18 J, 10 ns, 1064 nm pulsed, from a Nd:YAG laser. The background gas is hydrogen, at pressures in the atmospheric range. The ring structure was measured using schlieren imaging and Mach Zehnder interferometry. The expansion velocities of the laser-produced plasma in the background gas were measured in two directions; parallel and perpendicular to the metallic surface. Characteristic values are 5-9(.)10(3) m/s, for the ring radius expansion, parallel to the surface, and 1.0-1.7(.)10(4) m/s, perpendicular to the surface. Characteristic electron densities of the order of 10(18) cm(-3) were measured, with hollow radial profiles. The temperature of the plasma was estimated to be between 0.1 and 0.4 eV. This ring plasma is used as precursor plasma to achieve a hollow gas embedded z-pinch.