La inserción externa de las provincias argentinas. Rasgos centrales y tendencias a comienzos de 2000

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¿Existe aún una crisis de deuda latinoamericana?

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La banca de desarrollo en México

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Financiamiento a las microempresas y las PYMES en México (2000-2009)

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Regulación y supervisión de conglomerados financieros en Colombia

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La problemática de la coordinación de políticas económicas

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Presupuestar en Argentina, antes y después de la crisis de la deuda pública: enseñanzas, posibilidades y recomendaciones

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Inversión y productividad en la industria boliviana de telecomunicaciones

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Costa Rica: reformas económicas, sectores dinámicos y calidad de los empleos

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Inversión y productividad en la industria boliviana de electricidad

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Meal of cassava foliage as pigment of diets with cassava meal and oil of African oil palm for laying hens

Twenty-eight White Leghorn laying hens, of the Cuban commercial hybrid L-33, were used for eight weeks within the laying peak (36 to 43 weeks of age), to evaluate the meal of root of cassava (Manihot esculenta Crantz) and the crude oil of African oil palm (Elaeis guineensis J.) as pigments of the egg yolks, out of their incorporation to the diet of laying hens during the laying peak. The birds were allocated in individual cages, with 108 g of feed/bird/d, water ad libitum, and 16 h of light. Analysis of variance was performed, according to one-way design with two treatments and fourteen repetitions (one cage with one hen). The treatments consisted of two diets (I- cassava meal + African palm oil, II- cassava meal + African oil palm + 2.5 % of cassava foliage meal). The viability was of 100 % in all the treatments. No differences were found for laying (91.59 and 90.10 %), which surpassed the potential of this hybrid during the laying peak (90 %), feed conversion/egg (118 and 120 g of feed/egg), mass of egg produced (3071 and 3027 g/bird) and mass conversion (1.98 and 2.00). The pigmentation of the egg yolk was doubled, by adding 2.5 % of meal of cassava foliage to the diets (3 and 6 in the scale of Roche). It was likeable to enhance the pigmentation of the egg yolk and reduce the feeding costs of the laying hens, when including 2.5 % of meal of cassava foliage to diets where the cassava meal and the oil of the African oil palm are basic sources of starch and lipids for the laying hens.

Report of the Regional Seminar on the Economic Characteristics of the Population in the 1990 Censuses

Informe del Seminario que tuvo por objetivo permitir la discusion de la dimension economica y social investigada por los censos para proveer pautas para el censo del 90. Contiene lista de documentos presentados, contenido de las reuniones y conclusiones y recomendaciones.

Ethanol electro-oxidation in an alkaline medium using Pd/C, Au/C and PdAu/C electrocatalysts prepared by electron beam irradiation

Carbon-supported Pd, Au and bimetallic PdAu (Pd:Au 90:10, 50:50 and 30:70 atomic ratios) electrocatalysts were prepared using electron beam irradiation. The obtained materials were characterized by energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and transmission electron microscopy (TEM), and their catalytic activities toward ethanol electro-oxidation were evaluated in an alkaline medium using electrochemical techniques, in situ attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR) analysis and a single alkaline direct ethanol fuel cell (ADEFC). EDX analyses showed that the actual Pd: Au atomic ratios were very similar to the nominal ones. X-ray diffractograms of PdAu/C electrocatalysts evidenced the presence of Pd-rich (fcc) and Au-rich (fcc) phases. TEM analysis showed a homogeneous dispersion of nanoparticles on the carbon support, with an average size in the range of 3-5 nm and broad size distributions. Cyclic voltammetry (CV) and chronoamperometry (CA) experiments revealed the superior ambient activity toward ethanol electro-oxidation of PdAu/C electrocatalysts with Pd: Au ratios of 90:10 and 50:50. In situ ATR-FTIR spectroscopy measurements have shown that the mechanism for ethanol electro-oxidation is dependent on catalyst composition, leading to different reaction products, such as acetaldehyde and acetate, depending on the number of electrons transferred. Experiments on a single ADEFC were conducted between 50 and 900 C, and the best performance of 44 mW cm-2 in 2.0molL-1 ethanol was obtained at 850C for the Pd:Au 90:10 catalysts. This superior performance is most likely associated with enhancement of ethanol adsorption on Pd, oxidation of the intermediates, the presence of gold oxide-hydroxyl species, low mean particle diameters and better distribution of particles on the support. © 2013 Elsevier Ltd. All rights reserved.

Informe final de la Reunión de Directores de Estadística de las Américas = Final report of the Meeting of Directors of Statistics of the Americas

Presenta el resumen de los debates de la reunión que tuvo como principales propósitos evaluar los avances logrados en actividades preparatorias de la Ronda de Censos del 90, absorción de tecnologías computacionales para el desarrollo estadístico de la región, cooperación técnica, capacitación y situación de las estadísticas sociales.

La creación de competencias dinámicas bajo un contexto de inestabilidad macroeconómica: el caso Edival

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