http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effect of Y₂O₃ addition on the microstructure and density of AgSnO₂ contact material
Xianhui Wang,Juntao Zou,Shuhua Liang,Zhikang Fan,Peng Xiao 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.6
AgSnO2-Y2O3 compound powders were prepared by a mechanical alloying (MA) method, AgSnO2-Y2O3 contact material was fabricated by pressing, sintering, repressing and resintering, the effect of Y2O3 addition, repressing and resintering on the microstructure and density of AgSnO2 contact material was investigated. The results show that there are drastic dedensifications or swelling, cracks and pores in AgSnO2 contact material fabricated by powder metallurgy, which thus has a lower density. The addition of Y2O3 is helpful in improving the microstructure and density significantly. The density increases significantly after repressing and resintering, and can reach 8.42 g/cm3. AgSnO2-Y2O3 compound powders were prepared by a mechanical alloying (MA) method, AgSnO2-Y2O3 contact material was fabricated by pressing, sintering, repressing and resintering, the effect of Y2O3 addition, repressing and resintering on the microstructure and density of AgSnO2 contact material was investigated. The results show that there are drastic dedensifications or swelling, cracks and pores in AgSnO2 contact material fabricated by powder metallurgy, which thus has a lower density. The addition of Y2O3 is helpful in improving the microstructure and density significantly. The density increases significantly after repressing and resintering, and can reach 8.42 g/cm3.
Yuejun Fu,Xing Li,Shuhua Zheng,Jun Du,Aihua Liang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.5
Autographa californica multiple nucleopolyhedrovirus (AcMNPV) have been applied in the pesticide prevention as new bioinsecticides. Many studies have been carried out to assess the effects of insecticide on microorganism communities in different environments. However, little is known about whether the pesticides affect the microbial community in soil. Therefore, we performed high-throughput sequencing of V3–V4 hypervariable regions of the 16S rRNA genes from the bacteria in soil treated with AcMNPV and compared the difference of microbiota in these soil samples. In the study, a total of 80,301 validated reads were obtained, and the bacteria found belonged to 31 phyla and 748 genera. Statistical analysis showed that AcMNPV contributed the growth of Fusobacteria, Tenericutes, Cyanobacteria/Chloroplast, Actinobacteria, Gemmatimonadetes. AcMNPV inhibited the growth of Fibrobacteres, Crenarchaeota, Firmicutes, DeinococcusThermus, TM7, Chlorobi, Synergistetes, BRC1, Chlamydiae, Euryarchaeota, Planctomycetes, Acidobacteria, Verrucomicrobia, Bacteroidetes, Elusimicrobia, Nitrospira, Armatimonadetes, Proteobacteria, WS3, OD1, Chloroflexi, Spirochaetes. AcMNPV had no effect on SR1, OP11, Thermodesulfobacteria, Aquificae. Alpha Diversity analysis showed that the diversity of bacterial community for the soil treated with AcMNPV was lower than that of the soil before treatment or the control group. Meanwhile, the similarity of soil samples from AcMNPV treated group compared with samples from either untreated or prior treatment group was low as shown by Beta Diversity analysis. These findings provide previously unknown information about the impact of AcMNPV on the soil bacterial community structure and also lay a foundation for further investigations of AcMNPV how influences the development and progression of bioinsecticides.