From the public petroleum management models, article points out typical features of this type management, namely: i) attracting foreign investment through design and financial terms contracts; ii) production sharing iii) participation national oil companies (NOC) in these processes. On basis analysing experiences some countries world petroleum, analyses current situation Vietnam, highlights lim...

OBJECTIVE To evaluate the effect of different fractions of Black Maca (Lepidium meyenii), obtained from the hydroalcoholic extract, on spermatogenesis. DESIGN Animal study. SETTING Animal and laboratory facilities at a university. ANIMAL(S) Forty two adult male rats from the Holtzman strain (3 months old). INTERVENTION(S) Hydroalcoholic extract of Black Maca was partitioned with the fol...

This paper estimates changes in the energy return on investment (EROI) for five large petroleum fields over time using the Oil Production Greenhouse Gas Emissions Estimator (OPGEE). The modeled fields include Cantarell (Mexico), Forties (U.K.), Midway-Sunset (U.S.), Prudhoe Bay (U.S.), and Wilmington (U.S.). Data on field properties and production/processing parameters were obtained from a comb...

Introduction: The increasing trend of petroleum production in Iran and lack of proper and systematic management of waste products in the deposition of petroleum storage tanks have made the existing hydrocarbons as a major hazards to the environment. In this study, the ozonation process was used to remove the petroleum deposits. Materials and Methods: In this experimental study, effects of pH, ...