November 2012
Returning to the old belief of "ether" is mandatory
Luminiferous ether or light-bearing ether or simply ”ether”, which had been mentioned somehow since 17th century by Boyle, once believed to be a medium for traveling of light. Although, experiments like the Michelson and Morley could not prove its existence. In this article, we try to explain that, the experiments for detecting ether should be done in ultra-high velocities (over 5000 km/s), and that;...
November 2012
Hardness-improvement of titanium using mixture gases
Hardness of 99.7% titanium was improved in acetylene-ammonia mixtures at 1,250°C for 2 h. The flow rate of acetylene was set constantly at 0.4 cm3s-1, but those of ammonia were varied over the range of 0 to 12 cm3s-1. By using an X-ray diffractometer (XRD) and an energy dispersive X-ray (EDX) analyzer, TiC, TiN, TiC0.7N0.3, and TiC0.3N0.7 phases with the corresponding elements were detected. Knoop hardness...
November 2012
Compositional domain dynamics in two-coupled lipid monolayer: A mean field approximation approach
A continuum model for artificial membrane was developed by treating the upper and lower layers of the membrane as a pair of coupled Ising monolayers. Linear coupling between the layers was included. Linear stability analysis was used to predict the phase diagram. The dependence of the phase-separated regions on inter-layer coupling is determined. We numerically solve the Cahn-Hilliard type equations to obtain domain...
November 2012
Composition dependence of structural, morphological and magnetic properties of Co (FCC)-Cu granular films
The Cobalt (Co) (FCC)-Copper (Cu) magnetic films with different compositions (x = 55.5, 44.4, 22.5) grown on glass substrate are prepared by sputtering process using a Co target and Cu sheets. The effects of the composition on morphological, structural and magnetic of the films were reported. Scanning electron microscopy (SEM) results showed that the film thickness is about 80 nm. Atomic force microscopy (AFM)...
November 2012
Application of Benjamin-Feir equations to Tornadoes’ rogue waves modulational instability in oceans
Pilots put their plane in the ideal conditions for the atmosphere to suck it and allow a successful launch; similarly some portions of the ocean surface put a Troposphere column placed above them in ideal temperature and humidity training tornadoes and primary gravity waves that accompany them. To study the behavior of rogue waves triggered by tornadoes in terms of their space and time evolution, that is, their motion...
November 2012
Breast tumor detection using microwave ultra wideband (UWB) forward scattering radar system
Most of the currently established techniques for breast cancer have inherent disadvantages, such as destructive effects, image accuracy, and others. In addition, mammography and nuclear methods have a potential for producing harmful ionization effects in humans. Another technique for breast cancer detection is microwave imaging radar, which has the advantage of a less hazardous modality and is a non-destructive method....
November 2012
Individual and competitive adsorption of Lead(II) and Nickel(II) ions by chemically activated carbons
This work deals with the removal of heavy metals from wastewater which presents a major ecological problem. Recently, this has been solved by using adsorption techniques as a means to extract heavy metal ions. The present investigation was carried out on the adsorption of heavy metals from single and binary component aqueous solutions on activated carbons. The concentrations of heavy metals ions, Ni(II) and Pb(II),...
November 2012
Analysis and optimization of a repairable M[x]/G/1 queue with an additional optional vacation
This paper investigates an M[x]/G/1 queueing system with an unreliable server, where the server may take an additional vacation after the essential vacation. If the system becomes empty, the server leaves the system and takes the essential vacation. At the end of the essential vacation, the server may return to the system with probability p or take another vacation with probability 1-p. When the additional...
November 2012
Wind energy conversion system with full-scale power converter and squirrel cage induction generator
This paper describes a modeling and control of a variable speed squirrel-cage induction generator with back to back power electronics converters used in variable speed wind energy conversion system. The power electronics is composed of the generator side converter (GSC) coupling to the grid connected converter (GCC) together via DC bus capacitor. The generator side converter (GSC) is controlled by direct torque...
November 2012
Metallic phytoremediation and extraction of nanoparticles
The use of phytoremediation is a non-destructive method of heavy metal’s removal from soils. Water hyacinth plant (Eichhronia crassipes), normally found in habitats around the world, and has the ability to extract heavy metals through its roots, stem, and leaves. The main aims of this study were two folds; the use of water hyacinth plant to remove metals (Lead, Pb; Copper, Cu; Zinc, Zn; Chromium, Cr; and Cadmium,...
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