für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A comprehensive study was conducted to determine thorium, uranium and potassium elemental concentration in Kajuru, Kaduna State Nigeria using model Disa-300 portable gamma-ray spectrometer. The data were collected at 300 stations from all over the bedrock surface of the site based on the different lithological units of the study area. Element concentrations determined for uranium (eU) is 62 ppm bounded by 63 ppm contour line were considered anomalous and the threshold value of eU/eTh derived from the background corrected data for the site estimated to be 0.76 ppm. Therefore, all areas bounded by the 0.80 ppm contour line were considered anomalous. The high surface eU concentrations indicate uranium enrichment in this area. The high eU/eTh values and the surface K concentrations were low indicates preferential enrichment of uranium and thorium to potassium in this area. ····· 10361114105
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The Equation of state (EOS) of condensed matter is very important in many fields of basic and applied sciences [1-3]. A relation between pressure (P) and volume (V) which is capable of predicting P-V behaviour of a substance at constant temperature is known as isothermal EOS. The properties of solids under varying conditions of temperature and pressure have attracted the attention of theoretical and experimental workers because of their need in different branches of science [4-8]. In order to understand the behaviour of solids from atmospheric pressure (as P=0) upto their structural transition pressure and from room temperature upto melting temperature, it is desirable to have a precise knowledge of temperature and pressure dependence of several properties such as pressure dependence of unit cell volume ratio (V/V0), Grüneisen parameter ( ), Anderson- Grüneisen parameter ( T), Debye characteristic temperature ( D)etc. ····· 10361113564
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray It appears from the complete survey of literature, most of the equation of state are suitable for expressing the isothermal pressure-volume relationship. The thermodynamic state of a system is usually defined by pressure P, temperature T and specific volume V, linked by the equation of state (EOS). Various possible equation of states for solids (EOS) at high pressure and high temperature have been considered. In order to build compositional Earth models, it is indispensable to have an EOS for the regions of the interior of Earth as well as for the candidate minerals. The aim of the present work is to evaluate various useful and interesting properties i.e. Debye temperature, maximum Debye frequency, elastic anisotropy, shearing wave velocity, compressional wave velocity, mean wave velocity, shear modulus, Grüneisen parameter and Anderson- Grüneisen parameter. The present work is divided into five Chapters including introductory part of the thesis. Other chapters cover the evaluation of accustic properties and variation of pressure with different compressions. Agreement of result with experimental values are appreciable. ····· 10361102771
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Dr. Abdoullah Namdar has obtained PhD degree in 2009 form University of Mysore. To his credit he has 27 research papers appeared in reputed international journals. He has been referee for several research papers of reputed international journal, lecturer and associated research in different universities in India. Prof.G.S.Gopalakrishna is obtained Ph.D degree in 1994. He has successfully completed 3 major research projects awarded by DST, Government of India and Karnataka state government. To his credit he has 75 research papers appeared in reputed international and national journals. 8 candidates have obtained their doctoral degree so far. ····· 10361100691
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Subvolcanically emplaced granitic, miarolitic pegmatites associated with the White Mountain Igneous Province (WMIP), New Hampshire, were sampled and analyzed using modern analytical techniques including X-ray fluorescence, electron microprobe, scanning electron microscopy, and direct-coupled plasma spectrophotometry. Analytical results suggest that all the sampled miarolitic pegmatites from this study are petrogenetically related to the same intrusive suite, the WMIP. Based on the geochemical data, all the samples formed in an anorogenic tectonic setting and are rift-related. They are classified as NYF-type and plot in the within plate granite field on tectonic discrimination diagrams. The majority of the samples are peraluminous, A1-type granites. The trace element abundances on the spider diagram and chondrite-normalized diagram, which include a pronounced negative Eu anomaly and REE enrichments, are consistent with these miarolitic pegmatites resulting from a strongly fractionated granitic parental melts, but less fractionated than the classic NYF-systems such as South Platte (Simmons et al. 1987) and the Wausau Syenite Complex (Meyers et al. 1984). ····· 10361100234
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray None of the clay minerals was found to be dominating in either silt or clay fractions. Both the fractions showed the presence of mixture of minerals namely mica, smectite, kaolinite and vermiculite. The presence of smectite and vermiculite amidst ubiquitous presence of mica indicates that mica might have weathered to give rise to smectite and vermiculite. In view of incipient development of soils in the Aravali sediments and also the similar kind of minerals throughout the profiles was suggested that the minerals present were not formed during the post deposition period of the soil formation. They appear to be inherited from the parent materials. The transformation of mica might have occurred at the source area of alluvium or during their transportation by water. Despite the soils were loamy sand or sandy loams textured but due to their enrichment in mica, smectite and vermiculite, they are beneficial in retaining moisture and nutrients during crop cultivation ····· 1036125513
····· lezzter Preis 88.20€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray En este documento se plantean básicamente tres objetivos: Caracterización del sector de la minería en el ámbito de la mediana empresa presentar los fundamentos que pueden servir para evaluar inicialmente el desarrollo de una actividad minera desde una perspectiva socioeconómica financiera y aportar una metodología para la evaluación económico financiera de proyectos mineros. Este documento presenta como aportación propia la aplicación del modelo de estructura de proyecto MPDM que amplia la capacidad de los analistas mineros para investigar la política de operaciones en un ejercicio de evaluación. En este modelo, un proyecto minero es modelizado como un portfolio de activos reales en el cual las zonas del depósito de mineral, delimitados en función de las calidades, localización y las dimensiones, asumen el papel de componentes del portfolio. ····· 1036124186
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Dada la formación de micelas observadas por auto-asociación de asfaltenos en solventes aromáticos, y la teoría de separación de fases en soluciones micelares, se reportan las concentraciones micelares críticas calculadas de asfalteno en tolueno, y se comparan con aquellas medidas por tensión superficial. El modelo desarrollado depende de C y K que corresponden a la temperatura crítica y al crecimiento de la micela, respectivamente. Se obtiene una expresión para el número de monómeros en la micela asfalteno-tolueno. Los diagramas de fase calculados para fracciones del petróleo muestran concordancia con aquellos medidos experimentalmente. Los números de monómeros de asfalteno agregados en la micela presentan tendencias similares a aquellos reportados para otros sistemas de micelas pequeñas, y también son del mismo orden de magnitud de aquellos reportados experimentalmente para micelas de asfalteno en tolueno. El acoplamiento entre micelización y separación de fase lleva a una coexistencia tricrítica de una fase monomérica y una fase micelar de asfaltenos. Estos desarrollos son útiles en estudios de miscibilidad de hidrocarburos pesados en la industria del petróleo. ····· 1036121966· 1 ·· 2 ·
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