The magnetotelluric method has improved significantly in recent years and is being used in hydrocarbon exploration in regions where seismic exploration is difficult. This includes areas where highvelocity carbonates and volcanic rocks are present in the near surface, overthrust belts, and in subsalt imaging. Magnetotelluric exploration was used in the Rocky Mountain Foothills in 2002 to determi...

A.P. Aizebeokhai ( ) Department of Physics, College of Science and Technology, Covenant University, Ota, Ogun State, Nigeria e-mail: [email protected] Abstract The presence of contaminants in the environment requires a precise characterization of the nature and extent of contamination for effective remediation. Conventional environmental monitoring has focused largely on point s...

This paper presents a kinematic analysis of a parallel manipulator we have been developing for the micro-positioning application that requires high control bandwidth and high precision. The developed manipulator is a class of in-parallel platforms with 3 PRPS (prismatic-revolute-prismatic-spherical joints) chain geometry. The main advantages of this manipulator, compared with the typical Stewar...

Carbon nanotube conducting arrays were constructed via consecutive amidation reactions with the aid of a linker molecule and a condensation agent on a patterned amine-terminated glass substrate. The electrical resistivity of the nanotube films was sensitive to the degree of coverage for the substrate, making it possible to tailor nanotube multilayers suitable for use in micro- or nanoscale elec...

Abstract Log interpretation and evaluation of tight sandstone reservoir in Chang 8 Member Longdong West area, Ordos Basin, China, are facing great challenges due to the co-development normal oil pay resistivity low-contrast pay. To better guide exploration development resources this characteristics control mechanism were studied. Firstly, reservoirs divided into (RLP) (NP) based on relative val...

For the analysis of soil resistivity results and measurement, engineers have guidelines instructions from various international standards at their disposal. The circumstances under which mathematical expressions in these were obtained are not always clear. One such case is described this article refers to IEEE Standard 81-1983, an expression for apparent resistivity, a theoretical model predict...

Many systems can be modeled with hard and various size spheres, therefore packing and geometrical structures of such sets are of great importance. In this paper, rigid spherical particles distributed in different sizes are randomly packed in confined spaces, using a parallel algorithm. Mersenne Twister algorithm was used to generate pseudorandom numbers for initial coordination of particles. Di...

Spherical t-designs are point sets XM := {x1, . . . ,xM} ⊂ S2 which provide quadrature rules with equal weights for the sphere which are exact for polynomials up to degree t. In this paper we consider the problem of finding numerical spherical t-designs on the sphere S2 for high polynomial degree t ∈ N. That is, we compute numerically local minimizers of a certain quadrature error At(XM ). The ...

This paper presents the basic scheme and the log-normal, log-gamma and lognegative inverted gamma scenarios to establish the Rényi function for infinite products of homogeneous isotropic random fields on R. We also present our scheme for a field on the spherical surface in R, which is related to the CMRB problem in Cosmology. In the presentation, we need to employ spherical harmonics for some c...

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