Con datos hidrográficos de dos prospecciones, realizadas en marzo y setiembre 2014, se describe la hidrografía y estratificación en la bahía de Miraflores (BM) asociadas a condiciones cálidas y frías en ambos periodos. En marzo se presentó una condición estratificada y cálida, con máximos valores de frecuencia de Brunt Väisälä (FBV) y de vorticidad potencial (VP); asimismo la termoclina, haloclina y picnoclina fueron pronunciadas, debido principalmente a la mayor radiación solar recibida. En setiembre, la columna de agua fue más homogénea y fría con presencia de una capa de mezcla débil y somera. La distribución de la temperatura potencial, salinidad y densidad potencial tuvo una relación directa con la estacionalidad y con la configuración de la bahía en el aspecto espacial. Se espera que los resultados obtenidos en el presente estudio contribuyan a un conocimiento...

A series of CeαMn1-αO2 catalysts supported on g-alumina with various molar concentrations of Ce (α, from 0 to 0.90) was synthesized by coprecipitation, applying two different precipitating agents, namely, sodium hydroxide (method 1) and sodium carbonate (method 2), with the use of sodium permanganate as a redox agent for precipitation. XRD profiles of the supported samples revealed the predominant abundance of a typical fluorite crystalline structure. TPR thermograms of supported samples were displaced towards lower temperatures with increasing Mn concentration, in contrast with the bulk samples. The supported Ce-Mn samples exhibited a greater performance in n-hexane elimination than did the corresponding simple oxides. The sample Ce0.33Mn0.67O2 obtained by method 2 presented the best activity, probably due to the enrichment of Ce4+, Mn3+ and Mn4+ surface species, an excess of superfi...

This work proposes an algorithm for scalpel region detection using color segmentation and edge detection. The input images are obtained with a fixed camera that has a line of view perpendicular to the scalpel plane. Three squares of red, green and blue colors were added to the scalpel in order to serve as fiducials. For the detection of those marks, the use of two methods was evaluated: One based on the application of thresholds to the color components, and the other based on the use of a fuzzy rule machine. The experimentation shows that both approaches provide similar results. Some morphological operations are then applied in order to detect the scalpel region. The algorithm was successfully tested in several cases, and some examples of the results are presented and analyzed. © 2020 IEEE.

We report a case of abdominal ectopic pregnancy, including symptoms and outcome, as well as pertinent bibliography and comments.

We report a case of abdominal ectopic pregnancy, including symptoms and outcome, as well as pertinent bibliography and comments.

En el presente trabajo se reporta un estudio preliminar sobre la composición mineralógica y la identificación de las fases portadoras de hierro presentes en los peloides de una laguna ubicada en la provincia de Cañete, Lima-Perú. Las técnicas experimentales empleadas en el desarrollo del presente trabajo fueron la difracción de rayos X, espectroscopia Mössbauer por transmisión y fluorescencia de rayos X. Así mismo, se realizaron análisis físico-químicos midiendo el grado de acidez de las muestras. Los resultados obtenidos muestran que en los peloides analizados las fases portadoras del hierro están asociadas a la pirita y al sulfato ferroso. También se detectó la presencia de arcilla tipo bentonita.

The nature of the software requirements is subjective and varied. For this reason the level of complexity increases according to the volume, especially when the requirements are made in a natural language. Therefore obtain quality software requirements that are understandable and unambiguous in the Spanish language becomes a necessity.

At the present investigation the good conditions for the extraction of anthocyanins from purple corn cobs were investigated, by means of the employment of a complete design at random with factorial arrangement 2A3B4C4D. The factors studied were pH, solvent, time and temperature. The results showed anthocyanins between 8,404 and 47,984 mg/g of cob according to the method of differential pH. Analysis of four factors were presented.

At the present investigation the good conditions for the extraction of anthocyanins from purple corn cobs were investigated, by means of the employment of a complete design at random with factorial arrangement 2A3B4C4D. The factors studied were pH, solvent, time and temperature. The results showed anthocyanins between 8,404 and 47,984 mg/g of cob according to the method of differential pH. Analysis of four factors were presented.

Disordered crystalline Fe50Mn25+xSn25?x alloys, with x =-1.25, 0.0, 2.5, 5.0, 7.5 (close to the full-Heusler alloys), were arc-melted in a high purity argon atmosphere and the molten pellets were individually sealed in quartz tubes also under argon atmosphere. Subsequently, they were annealed at 1173 K for 4 days, being finally quenched in a bath with cold water. Structural and magnetic properties have systematically been studied using X-ray diffraction,57Fe, and119Sn Mössbauer spectroscopies, and magnetization measurements recorded at room temperature. Rietveld refinement of the X-ray diffraction patterns of the annealed samples with x =-1.25 and 0 has revealed the presence of two hexagonal crystallographic phases: (i) a chemically disordered solid solution identified as ??(Fe/Mn)3Sn (majority fraction) and (ii) the ??Fe5Sn3 intermetallic compound (minority fraction). For samples with ...