The Mo alloys reinforced by Al2O3 particles were fabricated by hydrothermal synthesis and powder metallurgy. The microstructures of Mo-Al2O3 alloys were studied by using XRD, SEM and TEM. The results show that Al2O3 p...The Mo alloys reinforced by Al2O3 particles were fabricated by hydrothermal synthesis and powder metallurgy. The microstructures of Mo-Al2O3 alloys were studied by using XRD, SEM and TEM. The results show that Al2O3 particles, existing as a stable hexagonal phase(α-Al2O3), are uniformly dispersed in Mo matrix. The ultrafine α-Al2O3 particles remarkably refine grain size and increase dislocation density of Mo alloys. Moreover, a good interfacial bonding zone between α-Al2O3 and Mo grain is obtained. The crystallographic orientations of the interface of the Al2O3 particles and Mo matrix are [111]a-Al2O3//[111]Mo and(112)a-Al2O3//(0 11)Mo. Due to the effect of secondary phase and dislocation strengthening, the yield strength of Mo-2.0 vol.%Al2O3 alloy annealed at 1200 ℃ is approximately 56.0% higher than that of pure Mo. The results confirm that the addition of Al2O3 particles is a promising method to improve the mechanical properties of Mo alloys.展开更多
The antidepressant effects of the flavonoid-rieh fraction of Monodora tenuifolia seed extract were examined by assess- ing the extent of attenuation of behavioural alterations and oxidative damage in the rats that wer...The antidepressant effects of the flavonoid-rieh fraction of Monodora tenuifolia seed extract were examined by assess- ing the extent of attenuation of behavioural alterations and oxidative damage in the rats that were stressed by forced swim test. Com- pared with the model control group, the altered behavioural parameters were attenuated significantly （P 〈 0.05） in the group treated with the flavonoid-rich fraction （100 and 200 mg·kg^-1）, comparable to the group treated with the standard drug, fluoxetine （10 mg·kg^-1）. The flavonoid-rich fraction and fluoxetine improved significantly （P 〈 0.05） the activities of the antioxidant enzymes such as superoxide dismutase and catalase as well as other biochemical parameters such as reduced glutathione, protein, and nitrite in the brain of the stressed rats. These results suggested that the flavonoid-rich fraction of Monodora tenuifolia seed extract exerted the antidepres- sant-like effects which could be useful in the management of stress induced disease.展开更多
基金Projects(U1704152,U1804124)supported by the National Natural Science Foundation of ChinaProject(174100510012)supported by Plan for Scientific Innovation Talent of Henan Province,China。
文摘The Mo alloys reinforced by Al2O3 particles were fabricated by hydrothermal synthesis and powder metallurgy. The microstructures of Mo-Al2O3 alloys were studied by using XRD, SEM and TEM. The results show that Al2O3 particles, existing as a stable hexagonal phase(α-Al2O3), are uniformly dispersed in Mo matrix. The ultrafine α-Al2O3 particles remarkably refine grain size and increase dislocation density of Mo alloys. Moreover, a good interfacial bonding zone between α-Al2O3 and Mo grain is obtained. The crystallographic orientations of the interface of the Al2O3 particles and Mo matrix are [111]a-Al2O3//[111]Mo and(112)a-Al2O3//(0 11)Mo. Due to the effect of secondary phase and dislocation strengthening, the yield strength of Mo-2.0 vol.%Al2O3 alloy annealed at 1200 ℃ is approximately 56.0% higher than that of pure Mo. The results confirm that the addition of Al2O3 particles is a promising method to improve the mechanical properties of Mo alloys.
基金supported by the Tertiary Education Trust Fund,Nigeria with grant number 2012
文摘The antidepressant effects of the flavonoid-rieh fraction of Monodora tenuifolia seed extract were examined by assess- ing the extent of attenuation of behavioural alterations and oxidative damage in the rats that were stressed by forced swim test. Com- pared with the model control group, the altered behavioural parameters were attenuated significantly （P 〈 0.05） in the group treated with the flavonoid-rich fraction （100 and 200 mg·kg^-1）, comparable to the group treated with the standard drug, fluoxetine （10 mg·kg^-1）. The flavonoid-rich fraction and fluoxetine improved significantly （P 〈 0.05） the activities of the antioxidant enzymes such as superoxide dismutase and catalase as well as other biochemical parameters such as reduced glutathione, protein, and nitrite in the brain of the stressed rats. These results suggested that the flavonoid-rich fraction of Monodora tenuifolia seed extract exerted the antidepres- sant-like effects which could be useful in the management of stress induced disease.
