Ultra-large zirconia toughened alumina (ZTA,mass ratio of Al2O3 and ZrO2 is 78∶22) ceramics with eccentric circle shape were successfully sintered by microwave sintering with a multi-mode cavity at 2.45 GHz.The dimen...Ultra-large zirconia toughened alumina (ZTA,mass ratio of Al2O3 and ZrO2 is 78∶22) ceramics with eccentric circle shape were successfully sintered by microwave sintering with a multi-mode cavity at 2.45 GHz.The dimension of ZTA ceramics (green body) is 165 mm (outer diameter) × 25 mm (thickness).The optimized sintering temperature of microwave sintering is about 1500 ℃ for 30 min,and the total sintering time is about 4 h which is much shorter than that of conventional sintering.An auxiliary-heating insulation device was designed based on the principle of local caloric compensation to guarantee the intact sintered samples.With the increasing of sintering temperature,more and more microwave energy is absorbed within the entire sample,volumetric densification performs,and phases shift from m-ZrO2 phase to t-ZrO2 phase and cause Al2O3 grain growth.展开更多
Remarkably, recent research on the Chinese labor market has suggested that the situation in China is inconsistent with the stylized fact that large firms pay higher wages and offer more generous benefits. Expanding th...Remarkably, recent research on the Chinese labor market has suggested that the situation in China is inconsistent with the stylized fact that large firms pay higher wages and offer more generous benefits. Expanding the empirical basis from 78 to 300 000 industrial firms, I overturn theprevious result andshow that wage determination in the averagefirmfits the international norm. Exploring subsamples of firms I also point to a likely source for the conflictingfindings： firm size is positively correlatedwith the average wage in private firms, but negatively correlated with the average wage in the state-owned sector. These novel results couM guide future studies aiming to understand the sources of the firm size wage premium, and, in particular, studies that target the largest industrial labor market in the world展开更多
基金This work was sponsored by the National Natural Science Foundation of China
文摘Ultra-large zirconia toughened alumina (ZTA,mass ratio of Al2O3 and ZrO2 is 78∶22) ceramics with eccentric circle shape were successfully sintered by microwave sintering with a multi-mode cavity at 2.45 GHz.The dimension of ZTA ceramics (green body) is 165 mm (outer diameter) × 25 mm (thickness).The optimized sintering temperature of microwave sintering is about 1500 ℃ for 30 min,and the total sintering time is about 4 h which is much shorter than that of conventional sintering.An auxiliary-heating insulation device was designed based on the principle of local caloric compensation to guarantee the intact sintered samples.With the increasing of sintering temperature,more and more microwave energy is absorbed within the entire sample,volumetric densification performs,and phases shift from m-ZrO2 phase to t-ZrO2 phase and cause Al2O3 grain growth.
基金Financial support from the Marianne and Marcus Wallenberg Foundationthe Ragnar Sderberg Foundation is gratefully acknowledged
文摘Remarkably, recent research on the Chinese labor market has suggested that the situation in China is inconsistent with the stylized fact that large firms pay higher wages and offer more generous benefits. Expanding the empirical basis from 78 to 300 000 industrial firms, I overturn theprevious result andshow that wage determination in the averagefirmfits the international norm. Exploring subsamples of firms I also point to a likely source for the conflictingfindings： firm size is positively correlatedwith the average wage in private firms, but negatively correlated with the average wage in the state-owned sector. These novel results couM guide future studies aiming to understand the sources of the firm size wage premium, and, in particular, studies that target the largest industrial labor market in the world
