RSM base study of the effect of deposition temperature and hydrogen flow on the wear behavior of DLC films

Synthesis of glycinamides using protease immobilized magnetic nanoparticles

“…Results shown in the model fit summary ( Table 3 ) confirms, that the quadratic model adequately described the relationship between variables and the % yield of AMD-1, AMD-2 and AMD-3. In this study, the value of the determination coefficient (R 2 ) of the model was (0.99, 0.99 and 0.99 for AMD-1, AMD-2 and AMD-3 respectively) suggests a highly satisfactory representation of the real relationships among the selected reaction parameters studied in this work [31] , [40] , [41] .…”

“…The straight lines of the residuals suggest that the errors are normally distributed and insignificant with the operating parameters (Fig. S1 Supplementary information) [31] , [33] , [47] .…”

“…Temperature, pH and time were used as the variables to maximize the response and Table 1 gives the range of variables employed in the work. The experimental design requires 17 experiments with three variables conducted with five replicates at the central point for the estimation of pure error sum of squares for each experiment [31] , [32] , [33] . The actual experimental data to establish the relationship between variables (temperature, pH, and time) and responses (% yield conversion) that are carried out for developing the model are shown in Table 2 , for the immobilized protease catalyzed synthesis of AMD-1, AMD-2 and AMD-3.…”

Influence of Beam Power on Young’s Modulus and Friction Coefficient of Ti–Ta Alloys Formed by Electron-Beam Surface Alloying

“…The results obtained show that the formation of Ti-Ta surface alloy on the top of Ti substrate leads to a decrease in the coefficient of friction, where this effect is more pronounced in the case of the formation of Ti-Ta surface alloys by a beam power of 1250 W. As already mentioned, in this case, the amount of the Ta alloying element is higher in comparison with the electron-beam surface alloyed specimen using a beam power of 1750 W. The lowest friction coefficient in the case of electron-beam surface alloying of Ti substrate with Ta by a beam power of 1250 W could be attributed to the larger amount of the alloying element, where the solid solution strengthening effect is greater [36]. This leads to a lower wear rate and friction coefficient [37][38][39]. According to the authors of [20], the COF values are significantly lower in the case of Ti-10Ta than the pure Ti material, as well as Ti-5Ta, which confirms the statement that a larger amount of the alloying element corresponds to a lower friction coefficient.…”