The Esfordi phosphate concentrate mainly contains fluorapatite, monazite, and xenotime as rare earth element (REE) minerals, accounting for 1.5% of rare earth metals. The monazite and xenotime minerals are refractory and their decomposition is only possible at high temperatures. Thus mechanical activation was used in the present work for this purpose. After 90 minutes of mechanical activation, ...

We call Poincaré time the time associated to the Poincaré (or first return) map of a vector field. In this paper we prove the non-accumulation of isolated critical points of the Poincaré time T on hyperbolic polycycles of polynomial vector fields. The result is obtained by proving that the Poincaré time of a hyperbolic polycycle either has an unbounded principal part or is an almost regular fun...

The nanorod morphology of the CeO2 support has been recognized as more beneficial than other morphologies for catalytic activity in dry reforming methane. Ni/nanorod-CeO2 catalysts with different Ni contents were prepared by one-pot hydrothermal synthesis. Samples characterized X-ray diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), desorption (H2-TPD), field emission scanning el...

In this research, Li1.25Mn0.125Ni0.125Co0.5O2 Nano powders, were synthesized using sol-gel method at different temperatures, lithium nitrate, manganese nickel cobalt nitrate as raw materials. Thermal and thermal gravimetric of TGA/DTA, characterization structure properties samples prepared by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) performed. Also, with scheme, i...

Undoped and 8 at. % Al doped ZnO films are deposited on glass substrates by sol-gel spin coating. The XRD patterns reveal polycrystalline nature of the with hexagonal Wurtzite phase. particle sizes calculated via Debye Scherrer formula lie between 21 to 66 nm. Presence tensile strain is observed Williamson Hall analysis. Almost 3.5 times enhancement happens when dopant introduced as compared un...

Aluminum-based composites reinforced with ceramic particles have been used for many applications because of their high hardness, good wear resistance, low weight, and thermal expansion coefficient. The Al-MgO/Mg composite was prepared in the present study. effects milling time amounts initial Mg MgO were studied on properties composite. milled powder mixtures subsequently analyzed by XRD SEM te...