阐述了基于N IOS II软核处理器和以太网控制芯片RTL 8019A S的网络接口设计。简要介绍了基于FPGA的SOPC(System On P rogramm ab le Ch ip,简称可编程片上系统)技术,给出了网络接口的软硬件的设计和实现。此设计增强了系统的灵活性,并...阐述了基于N IOS II软核处理器和以太网控制芯片RTL 8019A S的网络接口设计。简要介绍了基于FPGA的SOPC(System On P rogramm ab le Ch ip,简称可编程片上系统)技术,给出了网络接口的软硬件的设计和实现。此设计增强了系统的灵活性,并且结构简单适应于不同应用领域对接入网络的需求。展开更多
Polynitrogen compounds, comprising only nitrogen atoms, are rare. They are considered as promising candidates of clean(green) high energy density materials because of their high energy content and their sole decomposi...Polynitrogen compounds, comprising only nitrogen atoms, are rare. They are considered as promising candidates of clean(green) high energy density materials because of their high energy content and their sole decomposition product is N_2. Extending the previous work which was on cyclic N_8 isomers, in this study some cyclic N_(10) isomers having 1-4 cycles are considered within the limitations of density functional theory at the levels of B3LYP/6-311++G(d,p) and B3LYP/cc-PVTZ. Some of the structures,including the monocyclic one, decompose by eliminating certain number of N_2 units while some remain intact. All the stable isomers(1-3, 6-8) investigated presently are highly endothermic that they are candidates for clean high energy materials. Certain quantum chemical properties, IR and UV-VIS spectra as well as the specific impulse values for the stable structures are reported.展开更多
文摘阐述了基于N IOS II软核处理器和以太网控制芯片RTL 8019A S的网络接口设计。简要介绍了基于FPGA的SOPC(System On P rogramm ab le Ch ip,简称可编程片上系统)技术,给出了网络接口的软硬件的设计和实现。此设计增强了系统的灵活性,并且结构简单适应于不同应用领域对接入网络的需求。
文摘Polynitrogen compounds, comprising only nitrogen atoms, are rare. They are considered as promising candidates of clean(green) high energy density materials because of their high energy content and their sole decomposition product is N_2. Extending the previous work which was on cyclic N_8 isomers, in this study some cyclic N_(10) isomers having 1-4 cycles are considered within the limitations of density functional theory at the levels of B3LYP/6-311++G(d,p) and B3LYP/cc-PVTZ. Some of the structures,including the monocyclic one, decompose by eliminating certain number of N_2 units while some remain intact. All the stable isomers(1-3, 6-8) investigated presently are highly endothermic that they are candidates for clean high energy materials. Certain quantum chemical properties, IR and UV-VIS spectra as well as the specific impulse values for the stable structures are reported.
