The complex magnetic and structural properties of Co-doped Ni-Mn-Ga Heusler alloys have been investigated by using a combination of first-principles calculations and classical Monte Carlo simulations. We have restricted the investigations to systems with 0, 5 and 9 at% Co. Ab initio calculations show the presence of the ferrimagnetic order of austenite and martensite depending on the compositio...

The magnetic polarization induced by nonmagnetic impurities such as Zn in high Tc cuprate compounds is studied by the variational Monte Carlo simulation. The variational wave function is constructed from the eigenstates obtained from Bogoliubov de Gennes mean field Hamiltonian for the twodimensional t − J model. A Jastrow factor is introduced to account for the induced magnetic moment and the r...

The effect of different cations (M=Zr, Sn or Ti) doping on ceria supported nickel (Ni-Ce0.8M0.2O2) catalysts and their performance in the CO2 methanation reaction has been investigated. Among prepared catalysts, Ni-CeO2 (CN) catalyst exhibited best catalytic with a conversion 62.9% at 400 °C. selectivity Ni-Ce0.8Zr0.2O2 (CZN) remained above 98.4% from 200 to As confirmed by in-situ DRIFTS, diss...

We demonstrate a new strategy for tuning the size of large-diameter and few-walled nitrogen-doped carbon nanotubes (N-CNTs) from 50 to 150 nm by varying the transition metal (TM = Fe, Co, Ni or Mn) used to catalyze graphitization of dicyandiamide. Fe yielded the largest tubes, followed by Co and Ni, while Mn produced a clot-like carbon morphology. We show that morphology is correlated with elec...

introduction: today sport is one of the important social criterion and athletes are trying to be a champion. therefore, there is an increase in misuse of doping agents especially anabolic-androgenic steroid. this study was carried out to determine the prevalence of the doping agents' abuse among male bodybuilders' and to access their knowledge about their side effects in kermanshah gymnasiums i...