storage of hydrogen is one of the key challenges in developing hydrogen economy. magnesium hydride (mgh2) is an attractive candidate for solid-state hydrogen storage for on-board applications. in this study, 10 wt.% zrb2 was co-milled with magnesium hydride at different milling times to produce nanocrystalline composite powder. the effect of milling time and additive on the hydrogen desorption ...

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...

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...

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...

this work concerns the peristaltic flow of a williamson fluid model in an inclined asymmetric channel under combined effects of heat and mass transfer. the governing nonlinear partial differential equations are simplified under the lubrication approach and then solved analytically and numerically. the analytical results are computed with the help of regular perturbation and the numerical result...

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...

The effect of CaO on the formation of β- and γ-zirconia nanoparticles from α-zirconia was investigated and their stability evaluated via mechanical activation. α-ZrO2+8.5wt%CaO powder was milled for 2-150 hours with ball-to-powder weight ratios (BPWR) of 40:1 and 60:1. Structural evaluations were conducted using X-Ray diffraction and scanning electron microscope (SEM). Thermal analysis wa...

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...

In this study, BaZr1-xCoxO3 nanoparticles, x = 0.00, 0.04, 0.06, 0.08, 0.10 and 0.20, are synthesized through co-precipitation method. Therefore, structural, optical and magnetic properties have been investigated. The cubic perovskite structure is confirmed by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopic measurements. The average crystallite size and micro strain ...