El propósito de este trabajo de investigación es la caracterización mineralógica de la fracción arcillosa (<2µm) de tres muestras de suelos tropicales, seleccionadas de la Reserva Forestal de la Universidad Agraria de la Selva, localizada en la región Huanuco-Perú, enfatizando el estudio de los óxidos e hidróxidos de hierro (oxihidróxidos de hierro) y los minerales arcillosos presentes en las muestras con la ayuda del método químico de disolución selectiva ditionito-citrato-bicarbonato (DCB) para la disolución de óxidos de hierro cristalinos. Las técnicas analíticas como difractometría de rayos X (DRX) y espectroscopia Mössbauer por transmisión (EMT) a temperatura ambiente (TA) y 110 K fueron usadas para los análisis respectivos. Estos suelos tropicales han sufrido fuertes procesos de meteorización teniendo como resultado valores de pH ligeramente a fuertemente ác...

Adsorbentes magnéticos de nanopartículas de óxidos de hierro como magnetita (Fe3O4) y maghemita (-Fe2O3) fueron sintetizados y usados en la remoción de arsénico As (V) en agua. Estas nanopartículas de óxidos de hierro son materiales excepcionales debido a su buena capacidad de adsorción y a sus propiedades magnéticas. Busca investigar la idoneidad de las nanopartículas de Fe3O4 para la adsorción de As (V) y comparar sus propiedades físicas, potencial y eficiencia con respecto a las nanopartículas de - Fe2O3. Las nanopartículas magnéticas fueron obtenidas a través de métodos químicos en solución acuosa, oxidación parcial activada térmicamente y transformaciones de fase sólida de partículas en suspensión. Las partículas obtenidas fueron caracterizadas por difractometría de rayos X, fluorescencia de rayos X, espectroscopia Mössbauer, microscopia electrónica...

Applying the analytical technique of energy dispersive X-ray fluorescence (EDXRF) the elemental composition of the film that coats gemfibrozil medicinal tablets has been determined. The respective EDXRF spectrum shows relatively intense characteristic K X-rays peaks of titanium about a hundred times more intense than the other X-ray peaks present in the spectrum. The quantitative analysis of this spectrum, based on the assumption that the material within the tablet in uniformly distributed, shows that the calculated amplitude of the K$_{\beta}$ X-rays of titanium is about 25\% larger than the recorded peak indicating that the titanium is distributed as a film. The literature gives reference to the application of titanium oxide for coating tablets. Based on this hypothesis the thickness of the TiO$_{2}$ oxide film is calculated to be 1.90 $\mu$m.

Este trabajo analiza la pasta de 17 muestras de cerámica obtenidas de los trabajos de investigación del Proyecto Arqueológico Cerro de Oro, en el sitio del mismo nombre. Los análisis utilizan la técnica de espectroscopía Mössbauer, con el propósito de obtener un avance en la caracterización de ciertas particularidades de la pasta cerámica empleada, particularmente consistencia de la arcilla y tener información básica que nos permita en un futuro identificar la temperatura de cocción. Asimismo, cinco de estas muestras fueron analizadas vía la técnica de difracción por rayos X, con la intención de complementar la información obtenida por espectroscopía Mössbauer, particularmente con relación a los tipos de arcilla. Esta caracterización explorará la consistencia observada en la cerámica Cerro de Oro «típica», y las posibles agrupaciones internas, así como las par...

In this paper we study the mineralogical characterization of the clay fraction of two samples of agricultural soils from Vertisols from the Valle de San Lorenzo, Piura Region, using analytical techniques such as energy dispersion X-ray fluorescence (XRF), X-ray difractometry (XRD) and transmission Mössbauer spectroscopy (TMS). Prior to their mineralogical characterization, the samples were subjected to physicochemical analysis such as measuring their pH, removal of organic matter and textural analysis. In this work we have used two samples, which have been referred to as M1 and M2 and drawn two different calicatas at a depth of 50 cm and 150 cm respectively. Mössbauer spectra were taken at room temperature. Analysis of both samples by XRF indicated that both samples have approximately the same concentration of Fe, which was approximately 3,5% and 3,9% for M1 and M2 respectively. It als...

We report our results on compositional characterization of a ceramic sample from the site of Huacramarca, located in the Ancash region (Peruvian North-Central Highlands). ese results are based don XRD, XRF AND Mössbauer Espectroscopy analyses. Previous identication of compositional variability (based on macroscopical observations) suggest a pattern between dierent kinds of tempers and clay sources. Such patterns are strongly correlated with the variability identied through the outlined techniques, which allowed to go further and consider that alternative pottery-making processes were responsible for the Huacramarca assemblage. is suggests the possibility of dierent groups of people co-habiting in the settlement during the early part of the Late Intermediate Period.

We report our results on compositional characterization of a ceramic sample from the site of Huacramarca, located in the Ancash region (Peruvian North-Central Highlands). ese results are based don XRD, XRF AND Mössbauer Espectroscopy analyses. Previous identication of compositional variability (based on macroscopical observations) suggest a pattern between dierent kinds of tempers and clay sources. Such patterns are strongly correlated with the variability identied through the outlined techniques, which allowed to go further and consider that alternative pottery-making processes were responsible for the Huacramarca assemblage. is suggests the possibility of dierent groups of people co-habiting in the settlement during the early part of the Late Intermediate Period.

A comparative statistical analysis carried out at the Faculty of Physical Sciences, UNMSM, allows realize that there exists a marked disproportion between the numbers of admitted female and male students at the graduate level. Likewise, a similar situation is observed between the numbers of admitted and graduated female undergraduate students. These results based on statistical data verify that this eld of science continues to be masculinized.