In this paper a model of oil depletion is analyzed in which the shapes of field profiles are triangular and the sizes of successive fields decrease monotonically. It is shown that the curve representing the rate of production for this model is piecewise linear and concave up to a certain point after which it is monotone decreasing. Equations for natural smooth approximating curves having unique...

the catalytic oxidation of toluene over copper oxide supported on natural diatomite was investigated. the catalyst was prepared by the wet impregnation method and characterized by using the brunauer emmett teller (bet), field emission scanning electron microscopy (fesem), x-ray diffraction (xrd), x-ray fluorescence (xrf) and temperature-programmed reduction (tpr) analysis. the highest catalytic ...

The process of hydraulic fracturing for recovery of oil and natural gas uses large amounts of fresh water and produces a comparable amount of wastewater, much of which is typically transported by truck. Truck transport of water is an expensive and energy-intensive process with significant external costs including roads damages, and pollution. The integrated development plan (IDP) is the industr...

Aerobic thermotolerant methane oxidizers utilize as a sole carbon and energy source, predominantly they are associated with the phylum Proteobacteria. Here we present two further new strains (HGS-45: coccusshaped HGF-47: rod-shaped vibrioid) of obligate proteobacterial methanotrophic bacteria, which were isolated from an abandoned tropical natural gas field wet soil sample in northeast Banglade...