This paper uses the panel stochastic frontier model to study the total factor productivity of Chinese soybean.The research shows that the impact of direct cost and labor cost on yield is positive and significant,the i...This paper uses the panel stochastic frontier model to study the total factor productivity of Chinese soybean.The research shows that the impact of direct cost and labor cost on yield is positive and significant,the impact of indirect cost on yield is not significant,and the impact of cash cost on yield improvement is negative.展开更多
Thin alumina coatings were prepared on carbide tools to enhance their wear-resistant ability by dip coating from an aluminum alkoxide solution. The coating eventually obtained was perfectly integrated, without any mac...Thin alumina coatings were prepared on carbide tools to enhance their wear-resistant ability by dip coating from an aluminum alkoxide solution. The coating eventually obtained was perfectly integrated, without any macroscopic defect, and showed good performance in turning medium carbon steel, which presented a novel and promising coating method for cutting tools. The coating morphology before and after heat treatment was examined with the aid of a scanning electron microscope (SEM). The composition of coating and interface layer as well as the crystal structure of coating was characterized by X-ray diffraction (XRD). The elemental distribution near the interlayer was analyzed by electron probe microanalysis (EPMA).展开更多
文摘This paper uses the panel stochastic frontier model to study the total factor productivity of Chinese soybean.The research shows that the impact of direct cost and labor cost on yield is positive and significant,the impact of indirect cost on yield is not significant,and the impact of cash cost on yield improvement is negative.
文摘Thin alumina coatings were prepared on carbide tools to enhance their wear-resistant ability by dip coating from an aluminum alkoxide solution. The coating eventually obtained was perfectly integrated, without any macroscopic defect, and showed good performance in turning medium carbon steel, which presented a novel and promising coating method for cutting tools. The coating morphology before and after heat treatment was examined with the aid of a scanning electron microscope (SEM). The composition of coating and interface layer as well as the crystal structure of coating was characterized by X-ray diffraction (XRD). The elemental distribution near the interlayer was analyzed by electron probe microanalysis (EPMA).
