We report on the contact line dynamics of a triple-phase system silica/oil/water. When oil advances onto silica within water film squeezed between and silica, rim forms in recedes at constant velocity. evidence sharp (three orders magnitude) decrease velocity upon addition cationic surfactants above threshold concentration, which is slightly smaller than critical micellar concentration. show th...

As contagious bovine pleuropneumonia (CBPP) is spreading fast in many African countries, there is an increasing demand for rapid and sensitive diagnostic methods that can be used to confirm the initial diagnosis based on clinical symptoms or pathological findings. Two PCR-based diagnostic systems for identification of the infectious agent, Mycoplasma mycoides subsp. mycoides SC (M. mycoides SC)...

In this paper, a companding technique is proposed to effectively reduce the peak-to-average power ratio (PAPR) in single-carrier frequency division multiple access (SC-FDMA) systems. By companding the samples with large amplitudes, while enhancing those with small amplitudes, a significant reduction in the PAPR can be achieved. The performance of the proposed SC-FDMA with companding system is s...

This paper presents the friction and anti-wear characteristics of nano-oil with a mixture of refrigerant oil and carbon nano-particles in the thrust slide-bearing of scroll compressors. Frictional loss in the thrust slide-bearing occupies a large part of total mechanical loss in scroll compressors. The characteristics of friction and anti-wear using nano-oil is evaluated using a thrust bearing ...

In this work, the cholesterol concentration in the supercritical (SC) CO2, under working conditions, is calculated by implementing the modified Peng Robinson equation of state (EoS) combined with the Van Der Waals mixing rules. Here, optimisations of the interaction coefficient (kij) between solvent and solute and the solute critical parameters (i.e. critical pressure and temperature) are the m...

Carbon Capture and Storage (CCS) or Utilization (CCU) are expected to be powerful tools to reduce CO2 emissions to the atmosphere from large scale sources, such as electric power, oil refinery, steal making, cement plants, with continuing their activities Those contain the CO2 separation or capture from flue gases at the plants and the transport and injecting CO2 into oil and gas reservoirs, an...

Biosurfactants are amphipathic molecules with both hydrophilic and hydrophobic moieties and are surface active agent that are produced extracellularly or as a part of cell membrane by bacteria, yeast and fungi. In the present study, six different microorganisms were isolated from oil contaminated soils. Screening of biosurfactant producing potential strain was done using oil spreading method, o...

The main object of this paper is to study the subclass SC(γ, λ, β) of analytic univalent functions with negative coefficients in unit disc U = {z : |z| < 1}. Further coefficient estimates, distortion theorem and integral operators for this class are also obtained. We also discuss radii of convexity and closure properties for functions belonging to the class SC(γ, λ, β). 2000 Mathematics Subject...

Chemical control of the spontaneous motion of a reactive oil droplet moving on a glass substrate under an aqueous phase is reported. Experimental results show that the self-motion of an oil droplet is confined on an acid-treated glass surface. The transient behavior of oil-droplet motion is also observed with a high-speed video camera. A mathematical model that incorporates the effect of the gl...

Super-spreading trisiloxane surfactants are a class of amphiphiles which consist of nonpolar trisiloxane headgroups ((CH3)3-Si-O)2-Si(CH3)(CH2)3-) and polar parts composed of between four and eight ethylene oxides (ethoxylates, -OCH2CH2-). Millimeter-sized aqueous drops of trisiloxane solutions at concentrations well above the critical aggregate concentration spread rapidly on very hydrophobic ...