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Search Results: 1 - 10 of 197306 matches for " Luis E. Fuentes "
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LiMnPO4: Review on Synthesis and Electrochemical Properties  [PDF]
Joel O. Herrera, Héctor Camacho-Montes, Luis E. Fuentes, Lorena álvarez-Contreras
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.35007
Abstract: The olivine structured mixed lithium-transition metal phosphates LiMPO4 (M = Fe, Mn, Co) have attracted tremendous attention of many research teams worldwide as a promising cathode material for lithium batteries and for studying their magnetic and electrical properties. High energy density is required for mind- to large-scale batteries because the mounting spaces are quite small for vehicles and other energy storage applications. This constraint necessitates synthesis to yield high volumetric energy density and reliable battery performance. Development of eco-friendly, low cost and high energy density, LiMnPO4 cathode material became attractive due to its high operating voltage, which can be located inside of the electrochemical stability window of conventional electrolyte solutions and it offers more safety features due to the presence of a strong P-O covalent bond. This review is an overview of current research activities on LiMnPO4 cathodes and its carbon coating synthesized by various synthetic techniques.
Chemical composition and antigenotoxic properties of Lippia alba essential oils
López, Molkary Andrea;Stashenko, Elena E.;Fuentes, Jorge Luis;
Genetics and Molecular Biology , 2011, DOI: 10.1590/S1415-47572011005000030
Abstract: the present work evaluated the chemical composition and the dna protective effect of the essential oils (eos) from lippia alba against bleomycin-induced genotoxicity. eo constituents were determined by gas chromatography/mass spectrometric (gc-ms) analysis. the major compounds encountered being citral (33% geranial and 25% neral), geraniol (7%) and trans-β-caryophyllene (7%) for l. alba specimen col512077, and carvone (38%), limonene (33%) and bicyclosesquiphellandrene (8%) for the other, col512078. the genotoxicity and antigenotoxicity of eo and the compounds citral, carvone and limonene, were assayed using the sos chromotest in escherichia coli. the eos were not genotoxic in the sos chromotest, but one of the major compound (limonene) showed genotoxicity at doses between 97 and 1549 mm. both eos protected bacterial cells against bleomycin-induced genotoxicity. antigenotoxicity in the two l. alba chemotypes was related to the major compounds, citral and carvone, respectively. the results were discussed in relation to the chemopreventive potential of l. alba eos and its major compounds.
The influence of organic solvents on estimates of genotoxicity and antigenotoxicity in the SOS chromotest
Quintero, Nathalia;Stashenko, Elena E.;Fuentes, Jorge Luis;
Genetics and Molecular Biology , 2012, DOI: 10.1590/S1415-47572012000300018
Abstract: in this work, the toxicity and genotoxicity of organic solvents (acetone, carbon tetrachloride, dichloromethane, dimethylsulfoxide, ethanol, ether and methanol) were studied using the sos chromotest. the influence of these solvents on the direct genotoxicity induced by the mutagens mitomycin c (mmc) and 4-nitroquinoline-1-oxide (4-nqo) were also investigated. none of the solvents were genotoxic in escherichia coli pq37. however, based on the inhibition of protein synthesis assessed by constitutive alkaline phosphatase activity, some solvents (carbon tetrachloride, dimethylsulfoxide, ethanol and ether) were toxic and incompatible with the sos chromotest. solvents that were neither toxic nor genotoxic to e. coli (acetone, dichloromethane and methanol) significantly reduced the genotoxicity of mmc and 4-nqo. when these solvents were used to dissolve vitamin e they increased the antigenotoxic activity of this compound, possibly through additive or synergistic effects. the relevance of these results is discussed in relation to antigenotoxic studies. these data indicate the need for careful selection of an appropriate diluent for the sos chromotest since some solvents can modulate genotoxicity and antigenotoxicity.
ANALYSIS OF CONNECTED AIR VOIDS IN WARM MIX ASPHALT
ALLEX E. ALVAREZ,NELKIN MACIAS,LUIS G. FUENTES
DYNA , 2012,
Abstract: Las mezclas asfálticas tibias (MAT) son mezclas asfálticas producidas a temperaturas reducidas en comparación con las mezclas asfálticas en caliente (MAC) convencionales. Reducciones de temperatura del orden de 10 a 50 °C son posibles mediante la incorporación de diversos aditivos tipo MAT. Sin embargo, diferentes aspectos, incluyendo la estructura interna de MAT, aún son objeto de estudio. Consecuentemente, este artículo se centró en la evaluación de la estructura interna de MAT (calculada en términos de las características de los vacíos conectados (VC)), fabricadas con tres aditivos tipo MAT: Asphamin , Sasobit , y Evotherm . El contenido de VC corresponde a la fracción de vacíos que forman rutas conectadas en un espécimen compactado y está mejor relacionado con la respuesta de la mezcla asfáltica (e.g., permeabilidad) que el contenido total de vacíos. El análisis de VC se basó en la aplicación de tomografía computarizada con rayos-X y el subsecuente análisis de imágenes. Los resultados correspondientes sugirieron la necesidad de realizar investigación adicional para caracterizar mezclas compactadas en campo, producidas a niveles de densificación comparables con aquellos obtenidos en laboratorio. Adicionalmente, la inclusión de aditivos tipo MAT y la correspondiente reducción de temperatura no afectaron notoriamente la estructura interna de especímenes compactados en laboratorio (115 mm de altura) producidos para evaluación de mezcla en laboratorio.
Predicting the Coupling Properties of Axially-Textured Materials
Luis E. Fuentes-Cobas,Alejandro Mu?oz-Romero,María E. Montero-Cabrera,Luis Fuentes-Montero,María E. Fuentes-Montero
Materials , 2013, DOI: 10.3390/ma6114967
Abstract: A description of methods and computer programs for the prediction of “coupling properties” in axially-textured polycrystals is presented. Starting data are the single-crystal properties, texture and stereography. The validity and proper protocols for applying the Voigt, Reuss and Hill approximations to estimate coupling properties effective values is analyzed. Working algorithms for predicting mentioned averages are given. Bunge’s symmetrized spherical harmonics expansion of orientation distribution functions, inverse pole figures and (single and polycrystals) physical properties is applied in all stages of the proposed methodology. The established mathematical route has been systematized in a working computer program. The discussion of piezoelectricity in a representative textured ferro-piezoelectric ceramic illustrates the application of the proposed methodology. Polycrystal coupling properties, predicted by the suggested route, are fairly close to experimentally measured ones.
Rese a de "Santiago en EURE. Huellas de una metamorfosis metropolitana 1970/2000" de C. Mattos, L. Figueroa, P. Bannen y D. Campos (Editores)
Luis Fuentes
Revista de Geografía, Norte Grande , 2006,
Abstract:
Mila Freire, Mario Pòlese y Pamela Echeverría (eds.) (2004). Servicios públicos locales y competitividad urbana. El eslabón perdido en la relación entre macroeconomía y ciudades
Luis Fuentes
EURE (Santiago) , 2006,
Abstract:
Classification of Elliptic Line Scrolls
Luis Fuentes
Mathematics , 2000,
Abstract: The classification of projective elliptic line scrolls with the description of their singular loci is given. In particular we recover Atiyah Theorem by using classical methods.
Morfometría de Terceros Molares: un Estudio de 55 Casos
Fuentes F,Ramón; Borie E,Eduardo; Bustos M,Luis; Thomas M,David;
International Journal of Morphology , 2009, DOI: 10.4067/S0717-95022009000400050
Abstract: third molars are the teeth with the highest variation of shape, size, number and position. fifty five molars were extracted from patients of temuco, chile, which were classified by age, gender and location jaw. the following parameters were measured: vestibular-palatine diameter (vp), mesial-distal (md) diameter, coronary height (c-o), root length and total length. additionally, number of roots and cusps were quantified for each molar identifying those with abnormal molar shape. the data were statistically analyzed and tabulated. the results showed that upper molars have higher total length than lower ones, predominating those with a one fused root. regarding to crown shape, there was a predominance of tricuspid shape prevailing v-p diameter for upper third molars and tetracuspid for lower, noting m-d diameter. coronary length was higher for upper molars, but root length was higher for lower molars than upper ones.
First Premolar Morphometry: A Study in 54 Cases
Fuentes F,Ramón; Borie E,Eduardo; Bustos M,Luis; Tomas M,David;
International Journal of Morphology , 2011, DOI: 10.4067/S0717-95022011000100039
Abstract: first lower premolars are the teeth with greater variations following third molars. fifty four first premolars extracted by orthodontic indication from patients in temuco, chile, were studied and classified by age, sex and maxillar and mandible location. the following parameters were measured: vestibular-palatine diameter (vp), mesiodistal (md) diameter, coronary height (c-o), root length and total length. the data were statistically analyzed and tabulated. the results exhibited that first upper premolars showed higher values in the vp diameter and root length compared with the lower, noting significant differences. further, male sex showed higher values on most measures compared with females, except in root length. finally a difference in root length was observed between first upper and lower premolars.
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