Web Services是近年来出现的最重要的技术之一。它可以解决跨平台、分布式计算等问题,代表了下一代网络计算和企业应用的必然趋势。但是Web Services并不是只能解决“大”问题,本文中将利用其来实现通过LAN和Internet两种方式访问数据...Web Services是近年来出现的最重要的技术之一。它可以解决跨平台、分布式计算等问题,代表了下一代网络计算和企业应用的必然趋势。但是Web Services并不是只能解决“大”问题,本文中将利用其来实现通过LAN和Internet两种方式访问数据库的统一操作登录界面。展开更多
The 430 ℃ isothermal section of the Al 4Mg Sc Zr quaternary system in the Al rich range was determined by means of equilibrium alloys with the use of microstructure, X ray diffraction analysis and electron probe micr...The 430 ℃ isothermal section of the Al 4Mg Sc Zr quaternary system in the Al rich range was determined by means of equilibrium alloys with the use of microstructure, X ray diffraction analysis and electron probe microanalysis. There coexist three single phase fields, two two phase fields and one three phase field. It is established that the phase Al 3Sc 10.5 Zr 00.5 with L1 2 structure and Al 3Zr 10.8 Sc 00.2 with DO 23 structure are in equilibrium with the α solid solution, Zr being dissolved in Al 3Sc, further substituting for about 50% Sc(mole fraction) whilst Sc is present in the phase Al 3Zr and the maximum substitution for Zr is about 20%.展开更多
文摘The 430 ℃ isothermal section of the Al 4Mg Sc Zr quaternary system in the Al rich range was determined by means of equilibrium alloys with the use of microstructure, X ray diffraction analysis and electron probe microanalysis. There coexist three single phase fields, two two phase fields and one three phase field. It is established that the phase Al 3Sc 10.5 Zr 00.5 with L1 2 structure and Al 3Zr 10.8 Sc 00.2 with DO 23 structure are in equilibrium with the α solid solution, Zr being dissolved in Al 3Sc, further substituting for about 50% Sc(mole fraction) whilst Sc is present in the phase Al 3Zr and the maximum substitution for Zr is about 20%.
