The Results of Research of Magnetic Fluid Nanoparticles by Microscopy and X-ray Methods

This is a researching of dispersed, elemental and phase composition of magnetic fluids. Samples of magnetic fluids based on kerosene and vacuum oil are the objects of study. As the researching methods, we used scanning electron microscopy and atomic force microscopy as well as X-ray diffraction. There is a comparative analysis of data from these methods

From the Dynamic Demagnitizing Factor to the Heat Capacity of a Nanodispersed Magnetic Fluid

A technique for the measurement of the dynamic demagnetizing factor, used for the description of magnetic fluid magnetization disturbance caused by a sonic wave has been offered. The formula for the calculation of heat capacity Cp of the synthesized magnetic colloids, which includes the pa-rameter Nd has been obtained. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3365

Influence of Mass Transfer Processes on Couette Flow of Magnetic Fluid

This article describes the results of a theoretical study of magnetic fluid two-dimensional Couett flow in magnetic fluid seal model in view of mass transfer processes. It has been shown that very inhomogeneous magnetic field in seal gap lead to magnetic particle concentration rearrangement due to magnetophoresis and Brownian diffusion. In turn, it lead to inhomogeneous magnetic fluid viscosity and change in local and integral shearing force at channel walls. Integral shearing force has been shown to depend on magnetic field and magnetic fluid parameters. Closely-packed fluid density distribution conditions have been defined. Proposed theory covers real magnetic fluid seal performance features adequately. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3360

Features of the Rotational Kinetic of Magnetic Fluid Nanoparticles

The results of theoretical and experimental studies of the effect of the perturbation of magnetization of magnetic fluid in the initial part of magnetization curve, caused by thermal oscillations in the adiabatic sound wave are considered. The measurements were carried out on the magnetic colloid samples with dif-ferent viscosity of the dispersion medium within the frequency band of 20-60 kHz. In this frequency band, studied samples are characterized by the absence of thermal relaxation of the magnetization. The compari-son of the conclusions of the model of thermal relaxation of magnetization and the experimental results makes it possible to obtain information about the features of the rheology for the nearest molecular envi-ronment of a particle − nanorheology. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3635

El más antiguo platyperlidae (insecta, perlida= plecoptera) en depósitos del triásico superior temprano del sur de Sudamérica

The new insect species Platyperla marquati sp. nov. described herein is represented by a nymphal stage and belongs to the Order Perlida (= Plecoptera) Latreille (stoneflies). It comes from the uppermost section of the Potrerillos Formation, which crops out south of Cerro Cacheuta, at the southernmost end of the Precordillera (Mendoza Province, Argentina). The early Late Triassic Potrerillos/Cacheuta sedimentary succession in this area includes fluvial, deltaic and lacustrine facies that reflect deposition in the border of the Cacheuta depocenter of the Cuyo Basin. This is the second complete insect and the first autochthonous aquatic insect from Triassic beds in Argentina, and also the first record of the family Platyperlidae in Gondwana. This finding demonstrates the similarity of aquatic insect faunas in Mesozoic deposits all over the world, at least of the morpho ecological types of the aquatic stages. The lacustrine insect fauna began evolving during the Triassic and became diverse during the Jurassic and Early Cretaceous. Detailed geological studies revealed that levels equivalent to the middle Triassic lower units of the Uspallata Group (Río Mendoza and Cerro de Las Cabras formations) lie exposed on the southeastern flank of Cerro Cacheuta. Therefore, a new geological map and interpretation for this area are also presented.El nuevo insecto aquí descripto, Platyperla marquati sp. nov., está representado por un estadio ninfal y pertenece al Orden Perlida (=Plecoptera) Latreille. Este ejemplar proviene de la sección superior de la Formación Potrerillos, que aflora en el sur del Cerro Cacheuta, en el extremo sur de la Precordillera (Provincia de Mendoza, Argentina). La secuencia sedimentaria Potrerillos/Cacheuta en esta área de edad Triásico Tardío temprano, comprende facies depositadas en ambientes fluvial, deltaico y lacustre en un borde del depocentro Cacheuta de la Cuenca Cuyana. Este es el segundo insecto completo y el primero típicamente acuático hallado en los niveles del Triásico de la Argentina y también el primer registro de la Familia Platyperlidae en Gondwana. El hallazgo demuestra las semejanzas de la fauna de insectos acuáticos durante el Mesozoico a nivel mundial, por lo menos con respecto a los tipos morfo-ecológicos de los sistemas acuáticos pasados. En el Triásico, la fauna de insectos lacustres comienza su evolución llegando a tener un mayor desarrollo durante el Jurásico y Cretácico Inferior. Estudios geológicos detallados han revelado que niveles equivalentes a las unidades inferiores del Grupo Uspallata (formaciones Río Mendoza y Cerro de Las Cabras) afloran en el flanco sureste del Cerro Cacheuta. Por lo tanto se presenta un nuevo mapa e interpretación geológica para esta área.Fil: Gallego, Oscar Florencio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaFil: Rebori, Luis O. No especifica;Fil: Zavattieri, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Sinitshenkova, Nina. Borissiak Paleontological Institute, Russian Academy of Sciences; RusiaFil: Lara, Maria Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; ArgentinaFil: Martins Neto, Rafael G.. Universidade Estadual Do Ceara; Brasi