Publications by authors named "Zhongchao Sun"
Insects' flight is imbued with endless mysteries, offering valuable inspiration to the flapping-wing robots. Particularly, the multi-mode wingbeat motion such as flapping, sweeping and twisting in coordination presents advantages in promoting unsteady aerodynamics and enhancing lift force. To achieve the flapping-twisting-sweeping motion capability, this paper proposes an at-scale three-degree-of-freedom (3-DOF) mechanism driven by three piezoelectric actuators, which consists of three four-bar mechanisms and a parallel spherical mechanism.
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- The study aimed to assess how replacing fish meal or chicken meal with yeast culture affects bullfrog growth, serum biochemistry, and intestinal health.
- The results showed that the FM50 group had poorer growth performance and altered serum biochemistry compared to the control group, while the other experimental groups did not differ significantly from the control.
- Some groups exhibited enhanced digestive enzyme activities and liver antioxidant capacity, but the FM50 group had reduced intestinal villi height, suggesting that complete replacement of fish or chicken meal might negatively impact some health indicators.
To understand the responses of soil extracellular enzyme activities to the desert grassland-shrubland anthropogenic transition, we examined soil properties and six extracellular enzyme activities, in soil under vegetation patches and bare interspaces in desert grassland, grassland edge, shrubland edge, shrubland in a typical anthropogenic desert grassland-shrubland mosaic in desert steppe of eastern Ningxia, China. The six measured enzymes included cellobiohydrolase, β-1,4-xylosidase, β-1,4-glucosidase, β-1,4-N-acetylglucosaminidase, leucine aminopeptidase and alkaline phosphatase. We found that soil moisture, soil organic carbon, total nitrogen, total phosphorus, microbial biomass carbon and microbial biomass nitrogen decreased significantly by 26.
View Article and Find Full Text PDF[Responses of soil nitrogen to the transition from desert grassland to shrubland in eastern Ningxia, China].
Ying Yong Sheng Tai Xue Bao
April 2021
Article Synopsis
- The study examined soil properties and microbial characteristics across four transition sites from desert grassland to shrubland over nearly 30 years due to human-induced shrub introduction.
- Results showed increased aboveground biomass and annual herbs with the introduction of shrubs, while soil moisture, microbial biomass, and total nitrogen and carbon decreased.
- Nitrogen levels varied across ecosystems, with shrubland having the highest nitrate content and the lowest ammonium, indicating a shift in nitrogen dynamics and accelerated nitrification in shrubland compared to desert grassland.