Fullerenes(C_(60)/C_(70))were encased in silica aerogel by sol-gel process followed by supercriticd drying technique.Visible light emission was observed from the composite under Ar^(+)laser(488nm)excitation at room te...Fullerenes(C_(60)/C_(70))were encased in silica aerogel by sol-gel process followed by supercriticd drying technique.Visible light emission was observed from the composite under Ar^(+)laser(488nm)excitation at room temperature.The luminescent intensity was found to decrease whilst being red shift with the increase of the fullerene content in the composite(from 0.05 up to 2.5mol%).This can be interpreted with quantum confinement effect of fullerenes confined in networks of the nanoporous silica aerogel.展开更多
The formation process of C^o-complex in C_(60)-C_(60) collision has been clearly demonstrated by a molecular dynamics simulation.The complex^with a peanut-shell-like structuref is in a quite stable dynamical state.The...The formation process of C^o-complex in C_(60)-C_(60) collision has been clearly demonstrated by a molecular dynamics simulation.The complex^with a peanut-shell-like structuref is in a quite stable dynamical state.The results are consistent with recent observations.展开更多
We present an estimation of a critical size of a crossover from icosahedral to bulk-like(cuboctahedral)structures for copper clusters by a semi-empirical calculation of cohesive energies for both icosahedral and cuboc...We present an estimation of a critical size of a crossover from icosahedral to bulk-like(cuboctahedral)structures for copper clusters by a semi-empirical calculation of cohesive energies for both icosahedral and cuboctahedral copper clusters.The results are consistent with available experimental observations.展开更多
为解决地铁运营延误事件因缺乏合理的结构化情景构建方法而难以形成准确有效的属性知识,来辅助应急调度处置决策、减少主观经验依赖的问题,引入EOC(Element-Object-Consequence)模型,结合人-机-环安全体系和运营延误事件特征,提出了以...为解决地铁运营延误事件因缺乏合理的结构化情景构建方法而难以形成准确有效的属性知识,来辅助应急调度处置决策、减少主观经验依赖的问题,引入EOC(Element-Object-Consequence)模型,结合人-机-环安全体系和运营延误事件特征,提出了以列车运行为主的“要素(Element)-对象(Object)-结果(Consequence)-管理与响应(Management and Response)”情景构建框架,建立了事件情景属性关联分析模型,并设计了辅助决策应用流程。在此基础上,以供电故障引起的运营延误事件为例进行情景构建应用及可视化表达,分析了属性间关联性和敏感性。最后,对新供电故障事件的延误时间进行了预测,并与实际结果进行了对比验证。结果表明,在考虑要素和对象权重相同的前提下,环境要素、线路开通年份、列车最大运营年限对供电故障事件的总关联度影响较大,而新事件的预测延误时间相比实际延误时间的误差在15%以内,验证了结构化情景构建方法在事件影响预测上的可行性。展开更多
基金Supported by the National Natural Science Foundation of China.
文摘Fullerenes(C_(60)/C_(70))were encased in silica aerogel by sol-gel process followed by supercriticd drying technique.Visible light emission was observed from the composite under Ar^(+)laser(488nm)excitation at room temperature.The luminescent intensity was found to decrease whilst being red shift with the increase of the fullerene content in the composite(from 0.05 up to 2.5mol%).This can be interpreted with quantum confinement effect of fullerenes confined in networks of the nanoporous silica aerogel.
基金Supported by the National Natural Science Foundation of China,and Postdoctoral Science Foundation of China.
文摘The formation process of C^o-complex in C_(60)-C_(60) collision has been clearly demonstrated by a molecular dynamics simulation.The complex^with a peanut-shell-like structuref is in a quite stable dynamical state.The results are consistent with recent observations.
基金Supported in part by the National Natural Science Foundation of China,and Quantum Optics Laboratory,Chinese Academy of Science.
文摘We present an estimation of a critical size of a crossover from icosahedral to bulk-like(cuboctahedral)structures for copper clusters by a semi-empirical calculation of cohesive energies for both icosahedral and cuboctahedral copper clusters.The results are consistent with available experimental observations.
文摘为解决地铁运营延误事件因缺乏合理的结构化情景构建方法而难以形成准确有效的属性知识,来辅助应急调度处置决策、减少主观经验依赖的问题,引入EOC(Element-Object-Consequence)模型,结合人-机-环安全体系和运营延误事件特征,提出了以列车运行为主的“要素(Element)-对象(Object)-结果(Consequence)-管理与响应(Management and Response)”情景构建框架,建立了事件情景属性关联分析模型,并设计了辅助决策应用流程。在此基础上,以供电故障引起的运营延误事件为例进行情景构建应用及可视化表达,分析了属性间关联性和敏感性。最后,对新供电故障事件的延误时间进行了预测,并与实际结果进行了对比验证。结果表明,在考虑要素和对象权重相同的前提下,环境要素、线路开通年份、列车最大运营年限对供电故障事件的总关联度影响较大,而新事件的预测延误时间相比实际延误时间的误差在15%以内,验证了结构化情景构建方法在事件影响预测上的可行性。
