Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

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El 15 de agosto de 2007, la zona sur del Perú sufrió un sismo de 7.9 grados en la escala de Ritcher, cuyo epicentro estuvo frente a Pisco, ocasionando un colapso en la mayoría de las edificaciones y de los servicios del manejo de residuos sólidos con que contaba la ciudad. Pisco no cuenta con un relleno sanitario para la disposición final de los residuos sólidos esta se viene realizando en un botadero denominado San Luis. Al encontrarnos ante una situación de emergencia y para evitar una propagación de vectores, CONAM realiza una convocatoria para tomar la mejor decisión, esta fue: crear un botadero controlado.

The work displays an interpretation of the factors that make possible the application of a system of incentives based on academic merits in the public universities. The discussion considers from the perspective of the organizational and institutional change. It is argued that the development of a system of incentives in the public institutions of superior education is associate to transformations in the level of the academic actors (individual and groups), in the institutional level (rules and forms of coordination) and in the level of the interactions with the surroundings. It is maintained that these transformations imply as well changes in the government forms, in the forms of management, the sources of financing, the relations of education - investigation, and in the criteria of validation of results. Like illustration, one comments throughout the text, about the experience in the field of social sciences in a public university of the interior of the Mexican Republic.

The use of plants with allelopathic activity nowadays is very important because it allows us to develop a profitable agriculture and non-polluting the environment. The objective of this work was to study the action of aqueous extracts of garlic (Allium sativum L, Liliaceae), avocado (Persea americana Mill, Lauraceae) and rough (Ruta graveolens L, Rutaceae) on the development of vegetable radish (Raphanus sativus L, Brassicaceae). The extracts were prepared from A. sativum bulbs, P. americana seeds and R. graveolens leaves and flowers to which he adds crushed boiled water. Treatments were the pure extracts (20% w / v). The design was completely randomized with 4 repetitions. It was found fresh weight (g), dry weight (g), root length (cm) long area (cm) and leaf area (cm2 ). The data was analyzed with Anova and Tukey test for the comparison of averages. The results show that there is no significant effects compared to the control of allelopathic potential of aqueous extracts tested under controlled conditions.

The present work include the determination of microstructures of copper-aluminum dental alloys NPG and NPG+2, and the plot of their respective potenciodynamical polarization curves in artificial saliva. Based in these curves, densities of corrosion currents were determined by Tafel method, values that were used to calculate alloy dissolution velocity, it was encountered NPG+2 alloy is the most susceptible to corrosion. Also, corrosion products have been analyzed by EDAX, obtaining as result that in the most cases ions of Cu and Al were liberated to electrolytic environment, and in the minority of cases ions el Zn, Fe and Ni. This behavior affects health of patients with dental prosthesis.

With the results, we can point out that the wheathering produced reactions of hydrolyse, oxidation, silicate´s dissolution, sulphurs and sulphur reactions; originating secondary minerals (clays, H4SiO4, SiO2, Fe2O3, FeOOH, Fe(OH)3, Al(OH)3, Ca2+, Mg2+, Al3+, Fe3+, Na+, K+, SO42-, Pb2+, H2AsO-4, Cu2+), part of the weathering products going to the hydrologic system, and another part remains in the soil due to its low mobility, or for cationic or anionic interchange; these reactions are determined by the free energy, Eh and pH. The hydrochemistry analysis is based on the free energy, constant of balance, saturation index, graphs Eh-pH, rNa/rCl and rCl/rHCO3-2and, standing out to be calc-sodic water, due to the silicates weathering. Basing on the results obtained of the information of free energy, we determined that all the reactions are related to the saturation index and basing on the graph Eh-pH, the iron and aluminium react forming hydroxides. Petrologic studies (30 samples) and hydrogeochemistry analysis (9 water samples), determined that the ions, colloids and molecules that are in the river owe to natural pollution.

The objective of the work presented is the determination of the amount of dissolved oxygen in the OD Pilot Plant Recycling for raising tilapia of the PUCP by assessing the impact of variables. The OD is one of the critical variables for raising tilapia due to its importance in fattening because it leads to lower stress levels in fish, which consequently means diminishing their appetite. The system will allow know the OD of the pilot plant. We used statistical analysis of data, regression and diffuse representation of the data of variables measures. The system has a vague estimate of error of 6.38% and a ratio of 0.98. It is possible to improve the accuracy by increasing the amount of diffuse rules.  

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