Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Papers published in Hydrology and Earth System Sciences Discussions are under open-access review for the journal Hydrology and Earth System Sciences Abstract Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Abstract We studied the changes of geophysical parameters on a ...

For optimal hydrocarbon recovery from fractured reservoirs, a critical issue is to gain an accurate understanding of the natural fracture system. Currently, fracture characterization using amplitude based technologies is routinely performed relying on amplitude versus angle/offset (AVA/AVO) and azimuth (AVAZ) to exploit anisotropic gradient behavior, which is today commonly used in the industry...

The self gravitating ellipsoid has been the subject of study by many physicists and mathematicians. Newton first started the subject in the attempt to determine the eccentricity of the earth, which he modelled using a rigidly rotating ellipsoid made of a fluid of uniform density and subject only to its own gravity. Later on McLaurin generalized and refined his calculation of the eccentricity. I...

The propagation of seismic waves through Earth can now be modeled accurately with the recently developed spectral-element method. This method takes into account heterogeneity in Earth models, such as three-dimensional variations of seismic wave velocity, density, and crustal thickness. The method is implemented on relatively inexpensive clusters of personal computers, so-called Beowulf machines...

Assessments of Soil physical properties and estimation their associated variability are essential for making site-specific decisions on soil crop management This study examined the spatial hydro-physical variance structure at Sector F1 Jibia Irrigation project Katsina State, Nigeria. Grid sampling technique was used to obtain one hundred forty-four (144) samples from 206 ha land using Google ea...

In this paper, optimum trajectories in Earth Transfer Orbit (ETO) for a lunar transportation system are proposed. This paper aims at improving the payload ratio of the reusable orbital transfer vehicle (OTV), which transports the payload from Low Earth Orbit (LEO) to Lunar Low Orbit (LLO) and returns to LEO. In ETO, we discuss ballistic flight using chemical propulsion, multi-impulse flight usi...

We analyze the effect of companion stars on the bulk density of 29 planets orbiting 15 stars in the Kepler field. These stars have at least one stellar companion within 2′′, and the planets have measured masses and radii, allowing an estimate of their bulk density. The transit dilution by the companion star requires the planet radii to be revised upward, even if the planet orbits the primary st...

We use the density matrix formalism in order to calculate the energy level shifts, in second order on interaction, of an atom in the presence of a perfectly conducting wall in the dipole approximation. The thermal corrections are also examined when ¯ hω0/kBT = k0λT ≫ 1, where ω0 = k0c is the dominant transition frequency of the atom and λT is the thermal length. When the distance z between the ...