We have developed a novel gel trapping technique (GTT) which allows the three-phase contact angle of microparticles to be determined at an air-water or an oil-water interface. The method is applicable for particle diameters ranging from several hundred nanometers to several hundred micrometers. We also used the GTT for replicating of particle monolayers at liquid surfaces and for preparation of...

The influence of different factors on the asphaltene stability in three iranian crude oils was evaluated. Compositional studies ...

Halotolerant bacteria are regarded as effective oil-scavengers in the polluted saltern and seawater. In this regard, a halotolerant Planococcus was isolated from oilcontaminated area of Dezful north springs, Iran, due to its capacity in biosurfactant (BS) production. To facilitate hydrocarbons degradation, in the current study, the efficiency of BS production as function of growth rate of the h...

Porosity is one of the key parameters associated with oil reservoirs. Determination of this petrophysical parameter is an essential step in reservoir characterization. Among different linear and nonlinear prediction tools such as multi-regression and polynomial curve fitting, artificial neural network has gained the attention of researchers over the past years. In the present study, two-dimensi...

In this paper, the effects of oil and gold prices on stock market index are investigated. We use a cointegrated vector autoregressive Markov-switching model to examine the nonlinear properties of these three variables during the period of January 2003 - December 2014. The Markov-switching vector-equilibrium-correction model with three regimes representing "deep recession", "mild recession" and ...