The high-spin states of near-spherical nuclei can be constructed by coupling the angular momentums of openshell nucleons. The maximum-spin state of valence space is made by aligning the angular momentums of all valenc...The high-spin states of near-spherical nuclei can be constructed by coupling the angular momentums of openshell nucleons. The maximum-spin state of valence space is made by aligning the angular momentums of all valenceFig. 1 The revised level scheme of 91Y deduced from thepresent work.nucleons. Beyond that, the higher-spin states can begenerated by breaking the shell closures. Many studieshave been made about such excitation process of nucleiaround the quasi-doubly magic nucleus[1??4].展开更多
The influences of Ca and Y additions on the microstructure and corrosion resistance of vacuum die-cast AZ91 alloys were investigated by optical microscope,electron scanning microscope,weight-loss test,and electrochemi...The influences of Ca and Y additions on the microstructure and corrosion resistance of vacuum die-cast AZ91 alloys were investigated by optical microscope,electron scanning microscope,weight-loss test,and electrochemical corrosion experiment.The results indicate that the Ca or Ca and Y additions refined the microstructure and decreased the amount of Mg17Al12 phase on grain boundaries in the alloys.Meanwhile,the addition of Ca and Y led to the formation of network Al2 Ca phase and rod-like Al2 Y phase,improved the corrosion resistance of AZ91 magnesium alloy.Compared with AZ91 alloy,the corrosion rate of AZ91–1.5Ca–1.0Y alloy was decreased to 16.2%,and its corrosion current density was dropped by one order of magnitude after immersion in 3.5 wt% NaCl solution for 24 h.展开更多
文摘The high-spin states of near-spherical nuclei can be constructed by coupling the angular momentums of openshell nucleons. The maximum-spin state of valence space is made by aligning the angular momentums of all valenceFig. 1 The revised level scheme of 91Y deduced from thepresent work.nucleons. Beyond that, the higher-spin states can begenerated by breaking the shell closures. Many studieshave been made about such excitation process of nucleiaround the quasi-doubly magic nucleus[1??4].
基金National Natural Science Foundation of China(51165032,51364035)Funded by the Ministry of Education Tied up with the Special Research Fund for the Doctoral Program for Higher School(20133601110001)+2 种基金Innovative Group of Science and Technology of College of Jiangxi Province(00008713)Production and Teaching and Research Cooperation Plan of Nanchang Non-party Experts and Doctor(2012-CYH-DW-XCL-002)Special Funds for Postgraduate Innovation of Jiangxi Province
文摘The influences of Ca and Y additions on the microstructure and corrosion resistance of vacuum die-cast AZ91 alloys were investigated by optical microscope,electron scanning microscope,weight-loss test,and electrochemical corrosion experiment.The results indicate that the Ca or Ca and Y additions refined the microstructure and decreased the amount of Mg17Al12 phase on grain boundaries in the alloys.Meanwhile,the addition of Ca and Y led to the formation of network Al2 Ca phase and rod-like Al2 Y phase,improved the corrosion resistance of AZ91 magnesium alloy.Compared with AZ91 alloy,the corrosion rate of AZ91–1.5Ca–1.0Y alloy was decreased to 16.2%,and its corrosion current density was dropped by one order of magnitude after immersion in 3.5 wt% NaCl solution for 24 h.
