Theory of the Earth
نویسنده
چکیده
The densities and seismic velocities of rocks are relatively weak functions of temperature, pressure and composition unless these are accompanied by a drastic change in mineralogy. The physical properties of a rock depend on the proportions and compositions of the various phases or minerals-the mineralogy. These, in turn, depend on temperature, pressure and composition. In general, one cannot assume that the mineralogy is constant as one varies temperature and pressure. Lateral and radial variations of physical properties in the Earth are primarily due to changes in mineralogy. To interpret seismic velocities and density variations requires information about both the stable phase assemblages and the physical properties of minerals.
منابع مشابه
The Stability and Properties of Mn+@ C26-2nBnNn(M= alkaline and earth alkaline metals; n=0, 3) Complexes for Synthesis Application
The structural and electronic properties of C24-2nBn Nn and M@ C24-2nBn Nn (M= alkaline and earth alkaline metals; n=3 and 6) molecules are studied using the Density Functional Theory (DFT). It was found that the most interaction is in M@ C24-2nBn Nn complexes (M=Be, Mg; n=3 and 6). The negative nucleus-independent chemical shifts confirm that C24-2nBn Nn (n=3 and 6) cages exhibit aromatic char...
متن کاملنوسانات آزاد زمین
This work is a study of the Earths free oscillations considering a merge of solid and liquid model. At the turn of 19th century Geophysicists presented the theory of the free oscillations for a self-gravitating, isotropic and compressible sphere. Assuming a steel structure for an Earth size sphere, they predicted a period of oscillation of about 1 hour. About 50 years later, the free oscillat...
متن کاملInvestigating the Land Use Changes in the Upstream of the Zayandehrood Dam (A Study Case: The Toff-sefid Watershed, Chaharmaha and Bakhtiari Provin
River discharge is among the influential factors on the operation of water resources systems and the design of hydraulic structures, such as dams; so the study of it is of great importance. Several effective factors on this non-linear phenomenon have caused the discharge to be assumed as being accidental. According to the basics the chaos theory, the seemingly random and chaotic systems have re...
متن کاملSoil Arching Behind Retaining Walls under Active Translation Mode: Review and New Insights
Granular materials have a tendency to exhibit an arching effect by which the load is transferred from yielding parts to adjacent stationary parts. Retaining walls are among those structures that the soil arching plays an important role in the distribution of earth pressures. This paper briefly reviews the development of soil arching theory and its application to different geotechnical projects....
متن کاملLow-Thrust Optimal Orbit Raising with Plane Change
A new guidance scheme for the problem of Low-thrust transfer between inclined orbits is developed within the framework of optimal control theory. The objective of the guidance scheme is to provide the appropriate thrust steering program that will transfer the vehicle from an inclined low earth orbits to the high earth orbits. The presented guidance scheme is determined using Pontryagin’s princi...
متن کاملBourdieu and Genette in Paratext: How Sociology Counts in Linguistic Reasoning
While Bourdieu’s theory of practice provides an ensemble of conceptual tools which analyze patterns of social life that are irreducible to the limiting view of individuals as free-acting agents, Genette’s paratextual theory offers the metalanguage necessary to account for the microcosm of paratext as a linguistic space. This study takes issue with unidirectional approaches to researching parate...
متن کامل