Geometry optimization of p-C_(6)H_(4)-connected cyclo[20]carbon(p-C_(6)H_(4)-C_(20))was carried out at M062X/6-311G(d,p)level,three kinds of bond orders(Mayer,Laplacian,and Wiberg),electron-hole distributions,localize...Geometry optimization of p-C_(6)H_(4)-connected cyclo[20]carbon(p-C_(6)H_(4)-C_(20))was carried out at M062X/6-311G(d,p)level,three kinds of bond orders(Mayer,Laplacian,and Wiberg),electron-hole distributions,localized orbital locators(LOL),and infrared(IR)spectrum were also performed at the same level.Based on TD-DFT M062X/6-311G(d,p)method,the first 20 excited states and ultraviolet(UV)spectra of p-C_(6)H_(4)-C_(20) were calculated.Calculation results of π-electron delocalization analyses prove thatπ-electron delocalization of p-C_(6)H_(4)-C_(20) is more likely to occur on shorter C-C bonds rather than longer C-C bonds,and inside/outside of the ring plane rather than above/below the ring plane.Two absorption peaks of p-C_(6)H_(4)-C_(20) locate at about 319 nm and 236 nm,respectively.展开更多
文章以临夏现代职业学院校园网互联网协议版本6(Internet Protocol version 6,IPv6)升级改造为例,介绍互联网协议版本4(Internet Protocol version 4,IPv4)校园网现状和存在的问题,比较IPv4与IPv6的优缺点,结合IPv6迁移改造的双协议栈...文章以临夏现代职业学院校园网互联网协议版本6(Internet Protocol version 6,IPv6)升级改造为例,介绍互联网协议版本4(Internet Protocol version 4,IPv4)校园网现状和存在的问题,比较IPv4与IPv6的优缺点,结合IPv6迁移改造的双协议栈、隧道技术,探索规划阶段性升级改造IPv6的建设方案,重点讨论IPv4/IPv6双栈校园网技术实现。展开更多
文摘Geometry optimization of p-C_(6)H_(4)-connected cyclo[20]carbon(p-C_(6)H_(4)-C_(20))was carried out at M062X/6-311G(d,p)level,three kinds of bond orders(Mayer,Laplacian,and Wiberg),electron-hole distributions,localized orbital locators(LOL),and infrared(IR)spectrum were also performed at the same level.Based on TD-DFT M062X/6-311G(d,p)method,the first 20 excited states and ultraviolet(UV)spectra of p-C_(6)H_(4)-C_(20) were calculated.Calculation results of π-electron delocalization analyses prove thatπ-electron delocalization of p-C_(6)H_(4)-C_(20) is more likely to occur on shorter C-C bonds rather than longer C-C bonds,and inside/outside of the ring plane rather than above/below the ring plane.Two absorption peaks of p-C_(6)H_(4)-C_(20) locate at about 319 nm and 236 nm,respectively.
文摘文章以临夏现代职业学院校园网互联网协议版本6(Internet Protocol version 6,IPv6)升级改造为例,介绍互联网协议版本4(Internet Protocol version 4,IPv4)校园网现状和存在的问题,比较IPv4与IPv6的优缺点,结合IPv6迁移改造的双协议栈、隧道技术,探索规划阶段性升级改造IPv6的建设方案,重点讨论IPv4/IPv6双栈校园网技术实现。