DEAR EDITOR,Changes in gene expression occur as animals,including primates,age.Macaques have long been used as a model species for primate evolution and biomedical studies.Here,to study gene expression in Tibetan maca...DEAR EDITOR,Changes in gene expression occur as animals,including primates,age.Macaques have long been used as a model species for primate evolution and biomedical studies.Here,to study gene expression in Tibetan macaques (Macaca thibetana,TMs) and its differences to humans,we applied RNA-Seq to obtain the blood transcriptomes of 24 TMs.展开更多
To quickly predict the fatigue limit of 6061 aluminum alloy,two assessment methods based on the temperature evolution and the steady ratcheting strain difference under cyclic loading,respectively,were proposed.The tem...To quickly predict the fatigue limit of 6061 aluminum alloy,two assessment methods based on the temperature evolution and the steady ratcheting strain difference under cyclic loading,respectively,were proposed.The temperature evolutions during static and cyclic loadings were both measured by infrared thermography.Fatigue tests show that the temperature evolution was closely related to the cyclic loading,and the cyclic loading range can be divided into three sections according to the regular of temperature evolution in different section.The mechanism of temperature evolution under different cyclic loadings was also analyzed due to the thermoelastic,viscous,and thermoplastic effects.Additionally,ratcheting strain under cyclic loading was also measured,and the results show that the evolution of the ratcheting strain under cyclic loading above the fatigue limit undergone three stages:the first increasing stage,the second steady state,and the final abrupt increase stage.The fatigue limit of the 6061 aluminum alloy was quickly estimated based on transition point of linear fitting of temperature increase and the steady value of ratcheting strain difference.Besides,it is feasible and quick of the two methods by the proof of the traditional S-N curve.展开更多
The corrosion fatigue behavior of epoxy-coated Mg-3Al-1Zn alloy was investigated in air and 3.5 wt%NaCl solution. Epoxy coating as a new method was used to improve the corrosion fatigue property of the material.Result...The corrosion fatigue behavior of epoxy-coated Mg-3Al-1Zn alloy was investigated in air and 3.5 wt%NaCl solution. Epoxy coating as a new method was used to improve the corrosion fatigue property of the material.Results show that the fatigue limit（FL） of the coated specimens is higher than that of the uncoated specimens in3.5 wt% NaCl solution because of the strengthening and blocking functions of the epoxy coating. The FL of the coated specimens in 3.5 wt% NaCl solution is as high as that in air. It implies that the coated specimens are not as sensitive to the environment as the magnesium alloy. The low tensile strength and the short elongation of the pure epoxy coating lead to that the fatigue crack of the coated specimen is always initiated from the epoxy-coating film Pores and pinholes accelerate the fatigue crack initiation process. Pinholes are caused by the corrosion reactions between the epoxy coating and the NaCl solution.展开更多
基金supported by the National Natural Science Foundation of China 31501871(Z.X.F.)Department of Science and Technology of Sichuan Province 2019JDZH0029(X.Z.)+1 种基金Department of Science and Technology of Sichuan Province2020JDZH0026(X.Z.)Academy of Medical Sciences&Sichuan Provincial People’s Hospital 2017QN06(X.Z.)。
文摘DEAR EDITOR,Changes in gene expression occur as animals,including primates,age.Macaques have long been used as a model species for primate evolution and biomedical studies.Here,to study gene expression in Tibetan macaques (Macaca thibetana,TMs) and its differences to humans,we applied RNA-Seq to obtain the blood transcriptomes of 24 TMs.
基金This work was financially supported by the National Natural Science Foundation of China(Nos.51505322 and 51775366)the Natural Science Foundation of Shanxi Province,China(No.201801D221137).
文摘To quickly predict the fatigue limit of 6061 aluminum alloy,two assessment methods based on the temperature evolution and the steady ratcheting strain difference under cyclic loading,respectively,were proposed.The temperature evolutions during static and cyclic loadings were both measured by infrared thermography.Fatigue tests show that the temperature evolution was closely related to the cyclic loading,and the cyclic loading range can be divided into three sections according to the regular of temperature evolution in different section.The mechanism of temperature evolution under different cyclic loadings was also analyzed due to the thermoelastic,viscous,and thermoplastic effects.Additionally,ratcheting strain under cyclic loading was also measured,and the results show that the evolution of the ratcheting strain under cyclic loading above the fatigue limit undergone three stages:the first increasing stage,the second steady state,and the final abrupt increase stage.The fatigue limit of the 6061 aluminum alloy was quickly estimated based on transition point of linear fitting of temperature increase and the steady value of ratcheting strain difference.Besides,it is feasible and quick of the two methods by the proof of the traditional S-N curve.
基金financially supported by the National Natural Science Foundation of China (Nos. 51001079, 21201129, 51208333, and 51374151)Natural Science Foundation of Shanxi Province (No. 201101102002)+1 种基金the China Postdoctoral Science Foundation (No. 20100471586)the Doctoral Fund of Ministry of Education of China (No. 20091402110010)
文摘The corrosion fatigue behavior of epoxy-coated Mg-3Al-1Zn alloy was investigated in air and 3.5 wt%NaCl solution. Epoxy coating as a new method was used to improve the corrosion fatigue property of the material.Results show that the fatigue limit（FL） of the coated specimens is higher than that of the uncoated specimens in3.5 wt% NaCl solution because of the strengthening and blocking functions of the epoxy coating. The FL of the coated specimens in 3.5 wt% NaCl solution is as high as that in air. It implies that the coated specimens are not as sensitive to the environment as the magnesium alloy. The low tensile strength and the short elongation of the pure epoxy coating lead to that the fatigue crack of the coated specimen is always initiated from the epoxy-coating film Pores and pinholes accelerate the fatigue crack initiation process. Pinholes are caused by the corrosion reactions between the epoxy coating and the NaCl solution.
