<div style="text-align:justify;"> The residual stress distribution for two strategies of asymmetric quenching in Al-Zn-Mg-Cu aluminum alloy plates has been simulated using the finite element method. Th...<div style="text-align:justify;"> The residual stress distribution for two strategies of asymmetric quenching in Al-Zn-Mg-Cu aluminum alloy plates has been simulated using the finite element method. The results show that for asymmetric quenching between the upper and lower surfaces, the through-thickness asymmetric quenching residual stress distribution lies between the two distributions corre-sponding to the heat transfer coefficients on the upper and lower surfaces respectively. The surface and central stress magnitudes are equal to the average of the stress magnitudes corresponding to the two heat transfer coefficients. For asymmetric quenching of a single surface, the surface stress distribution is the same as the heat transfer coefficient distribution and the stress magnitude is equal to the stress magnitude corresponding to the average value of the heat transfer coefficients at each location. However, the center quench residual stress distribution is approximately uniform and the stress magnitude is equal to the average of the stress magnitudes corresponding to the maximum and minimum heat transfer coefficients. </div>展开更多
Dear Editor,The genetic mechanism of large-scale interspecies traits,including evolutionary novelties and the characteristics of high taxa,is a central issue in evolutionary biology.At present,genome-wide association ...Dear Editor,The genetic mechanism of large-scale interspecies traits,including evolutionary novelties and the characteristics of high taxa,is a central issue in evolutionary biology.At present,genome-wide association studies(GWAS)are known as one of the most powerful and affordable tools for understanding the association between heritable variations and phenotypic changes in populations of single species.Therefore,it would be interesting to determine whether GWAS can be applied to study large-scale interspecies traits.展开更多
The aim of the study was to study the chemical constituents of Callistephus chinensis flowers(CCF)(Chinese name is Cui Ju)and establish a method for determination of seven flavonoids in CCF by using HPLC simultaneousl...The aim of the study was to study the chemical constituents of Callistephus chinensis flowers(CCF)(Chinese name is Cui Ju)and establish a method for determination of seven flavonoids in CCF by using HPLC simultaneously.The compounds were isolated by repeated column chromatography with silica gel,and HPLC.展开更多
文摘<div style="text-align:justify;"> The residual stress distribution for two strategies of asymmetric quenching in Al-Zn-Mg-Cu aluminum alloy plates has been simulated using the finite element method. The results show that for asymmetric quenching between the upper and lower surfaces, the through-thickness asymmetric quenching residual stress distribution lies between the two distributions corre-sponding to the heat transfer coefficients on the upper and lower surfaces respectively. The surface and central stress magnitudes are equal to the average of the stress magnitudes corresponding to the two heat transfer coefficients. For asymmetric quenching of a single surface, the surface stress distribution is the same as the heat transfer coefficient distribution and the stress magnitude is equal to the stress magnitude corresponding to the average value of the heat transfer coefficients at each location. However, the center quench residual stress distribution is approximately uniform and the stress magnitude is equal to the average of the stress magnitudes corresponding to the maximum and minimum heat transfer coefficients. </div>
基金supported by grants from the National Key Program ofResearch and Development,Ministry of Science and Technology(2016YFC0503200)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDPB0202)+1 种基金the Key Research Program of the Chinese Academy of Sciences(KJZD-EW-L07)the NSFC Major Scientific Research Program(91746119).
文摘Dear Editor,The genetic mechanism of large-scale interspecies traits,including evolutionary novelties and the characteristics of high taxa,is a central issue in evolutionary biology.At present,genome-wide association studies(GWAS)are known as one of the most powerful and affordable tools for understanding the association between heritable variations and phenotypic changes in populations of single species.Therefore,it would be interesting to determine whether GWAS can be applied to study large-scale interspecies traits.
文摘The aim of the study was to study the chemical constituents of Callistephus chinensis flowers(CCF)(Chinese name is Cui Ju)and establish a method for determination of seven flavonoids in CCF by using HPLC simultaneously.The compounds were isolated by repeated column chromatography with silica gel,and HPLC.
