An Improved Method for Obtaining Small Pressed Powder Pellets for the Analysis by XRF

A rapid, very low cost of instrumentation and simple approach to specimen preparation for the analysis by X-ray fluorescence spectrometry is presented. This technique requires a few mg of powdered samples, which are compressed to produce pellets. This procedure is employed for determining major, minor and trace elements in muscovites and K-feldspars. Factors affecting measured intensities, such as particle size and distribution, surface texture, pelletizing pressure, etc, are considered. A description of the new sample preparation device, including technical characteristics, is also given. It is demonstrated that suitable specimen presentation to the X-ray beam is obtained by using our procedure.Fil: D`angelo, José Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; ArgentinaFil: Strasser, Edgardo. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; ArgentinaFil: Marchevsky, Eduardo Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Química de San Luis. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Química de San Luis; ArgentinaFil: Perino, Ernesto. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia; Argentin

Thermal analysis of induction and synchronous reluctance motors

In this paper, the thermal behavior of two induction motors (2.2 and 4 kW, four poles) and two synchronous reluctance motors [(SynRMs) transverse-laminated] are investigated and compared. Both motor types use the same stator but have different rotors. Using a lumped-parameter simulation program, a thermal analysis has been also carried out, and the obtained results have been compared with the experimental ones. A direct comparison of the thermal behavior of the two motor types has thus been made for constant load and constant average copper temperature conditions. Inasmuch as the SynRM has negligible rotor losses compared with the induction motor, it is capable of a larger rated torque, from 10% to more than 20%, depending on the relative size of end connections and motor lengt

Heideggers Kunstwerkaufsatz in mehrstimmiger Perspektive

Review to: David Espinet, Tobias Keiling (Hrsg.), Heideggers Ursprung des Kunstwerks. Ein Kooperativer Kommentar, Frankfurt am Main: Klostermann Verlag, 201

LA EXPERIENCIA DE LA CORPORALIDAD EN IMÁGENES. PERCEPCIÓN DEL MUNDO, PRODUCCIÓN DE SENTIDOS Y SUBJETIVIDAD

Este artículo parte de la doble dimensión que desde la antropología y la sociología se reconoce al cuerpo como receptor y productor de significados culturales. El interés del mismo es reflexionar sobre el efecto de las imágenes mediáticas en la corporalidad en las sociedades contemporáneas. La doble dimensión se traslada, para el análisis que aquí nos interesa, al cuerpo representado y al cuerpo perceptor de su propia imagen, espejada en otros cuerpos. A los fines de este trabajo, consideraré los modos en que se asienta la relación de los sujetos con la corporalidad a partir de y a través de la imagen: a) el cuerpo como lugar de la experiencia perceptiva del mundo; b) el cuerpo como lugar de producción de sentidos sobre las imágenes de otros cuerpos; y c) el sujeto frente a las imágenes de su propio cuerpo

Exploring Partnerships Between Embedded Providers and Faculty-Led Study Abroad Program Directors

This research reveals the sentiments of faculty about the perceived support structures and barriers in place for them to develop new international education outbound student mobility programs on US campuses with third party providers embedded within the education abroad office. This increasingly attractive partnership model is unique in the field for the multitudinous collaboration that it employs. Data was collected through three separate surveys and a series of interviews. The sample totaled 26 faculty and over 330 students responding to the surveys and an additional fifteen faculty interviewees, the research suggests establishing some tools and venues for faculty and international education staff to better engage cooperatively in the process of campus internationalization. Keywords: faculty engagement, education abroad, collaboration, internationalizatio