Browsing by Title Facultad de Ciencias
Now showing items 8071-8090 of 8185
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(2002)Research in pristine forests provides a necessary reference of energy and nutrient cycling in absence of anthropogenic influence. Therefore two unpolluted watersheds in the Cordillera de Piuchué of southern Chile (42°30′ ...
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(2012)Pollen and charcoal analysis from Laguna San Pedro (38°26'S, 71°19'W), a small closed-basin lake located within the present-day distribution of Araucaria- Nothofagus forest in the Temperate-Mediterranean Transition zone ...
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(Elsevier, 2014)We present a detailed record from Lago Lepué to examine vegetation, climate and fire-regime changes since the Last Glacial Maximum (LGM) in central-east Isla Grande de Chiloé (43°S), northwestern Patagonia. Precipitation ...
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(2011)Morus alba and Morus multicaulis, common ornamental species in Chile, were studied regarding their growth and dry matter production. In Santiago (Metropolitan Region), plants from vegetative propagation, one part growing ...
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Velocidad de invasión de la solución fundamental de una ecuación subdifusiva con término de reacción (Universidad de Chile, 2024)
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(Universidad de Chile, 2007)
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(Universidad de Chile, 2017)Este trabajo se desarrollé en la empresa manufacturera de ladrillos Cerámica Santiago S.A. Los objetivos fueron la verificación del cumplimiento de la norma vigente para gases y material particulado; regularizar el uso ...
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(Universidad de Chile, 2015)Se optimizó un método analítico para la determinación de metales pesados por espectrómetrometría de emisión óptica con plasma acoplado inductivamente (lCP-OES), la importancia del análisis de metales pesados se debe a que ...
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(Universidad de Chile., 1980)Se ha investigado la versión Epstein Neshet en teoría de perturbación de Rayleigh Schrodinger para el cálculo de la primera hiperpolarizabilidad dipolar eléctrica B en un conjunto de moléculas orgánicas mediante el método ...
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(Universidad de Chile, 1978)Este Trabajo se inspira en las ideas originales de pontryagin [1] y en el articulo de Kushner [5], pero su planteamiento y resultados son nuevos
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(2008)The structural elucidation of natural products and complex organic molecules relies heavily on the application of proton detected heteronuclear NMR. Among these techniques, the HMBC NMR experiment remains as the most popular ...
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(Universidad de Chile, 2013)Se desarrolla el estudio de tres teorías inspiradas en la gravedad de Eddington. La teoría Eddington-Born-Infeld (EBI) presenta singularidades en su curvatura cuando se modelan objetos compactos por materia descrita por ...
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(Universidad de Chile, 2022)Con una población global estimada en 2.000 individuos entre Argentina y Chile, menos del 1% de su población histórica, el huemul Hippocamelus bisulcus está categorizado como "En peligro". El objetivo de este estudio fue ...
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(Elsevier, 1999)The IR spectra of the M(mnt)(baba) where M = Ni and Pd, mnt = 1,2-maleonitrile and baba = biacetylbisanyline, were recorded in the high as well in the low energy region. A complete assignment of the observed bands was ...
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(Elsevier Masson SAS, 2018)© 2018 Elsevier Masson SAS Herein, we report the vibrational and optical properties of new Cu2ZnSn1-xGexS2Se2 solid solutions prepared by isomorphic substitution of a fraction of Se by S in Cu2ZnSn1-xGexSe4 (CZTGeSe) through ...
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(2012)Infrared and Raman spectra of O,O-dimethyl S- methylcarbamoylmethylphosphorodithioate, dimethoate, have been recorded. Density functional theory, DFT, with the B3LYP functional was used for the optimization of the ground ...
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(JOHN WILEY & SONS, 2008-09)The 3-methoxy-4-hydroxybenzoic acid or vanillic acid (VA) is a naturally occurring molecule important in winemaking. The spectral fingerprints of VA observed in the infrared and Raman spectra are assigned to fundamental ...
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(Elsevier, 2000)The infrared spectra of the azabipiridyl macrocycle complexes of Ni(II), Cu(II) and Zn(II) were registered between 4000 and 200 cm-1. The spectral assignment allowed to identify the complex formation and structural differences ...
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(Nature, 2015)The absolute configuration of the diterpenoid 9,12-cyclomulin-13-ol (1), a constituent of Azorella and Laretia species, has been established by vibrational circular dichroism spectroscopy in combination with density ...
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(1997)The FT-IR and Raman spectra for the solid naphthalocyanine (H2Nc) and their Co(II), VO2+ and Pb(II) complexes were registered, and a band assignment was proposed. On this basis, the structure of the complexes was inferred: ...