大功率锂离子动力电池具有较高的功率密度和能量密度,在纯电动汽车和混合动力汽车中具有很大的应用价值。本文采用数值模拟的方法,建立了大功率非均匀产热动力电池组三维模型,模拟分析了基于空气单向流动冷却和往复流动冷却的Li Fe PO4...大功率锂离子动力电池具有较高的功率密度和能量密度,在纯电动汽车和混合动力汽车中具有很大的应用价值。本文采用数值模拟的方法,建立了大功率非均匀产热动力电池组三维模型,模拟分析了基于空气单向流动冷却和往复流动冷却的Li Fe PO4动力电池组(4×6)的散热性能。结果表明,对于大功率电池正负极产热不均匀的情况,为了降低电池模块的局部温差,电池采用正负极交叉式排列组合是必要的;随着入口风速的增大,角度大小对散热性能的影响增大;周期较长时的往复通风方式不利于减小电池组局部温差,甚至在长时间内会增加局部温差。展开更多
The straight chain n-Mkanes and their mixture, which can be used as phase change materials （PCM） for ther- mal energy storage, have attracted much attention in recent years. We employ the molecular dynamics （MD） s...The straight chain n-Mkanes and their mixture, which can be used as phase change materials （PCM） for ther- mal energy storage, have attracted much attention in recent years. We employ the molecular dynamics （MD） simulation to investigate their thermophysical properties, including self diffusion and melting of n-octadecane with crystal and amorphous structures. Our results show that, although the initial and melted structures of n-octadecane with crystal and amorphous are different, the melting behaviors of n-octadeeane judged by the self diffusion behavior are consistent. The MD simulation indicates that both the crystal and amorphous structures are effective for the property investigation of n-octadecane and the simulated conclusion can be used as reference for modeling the alkanes-based PCM system.展开更多
OBJECTIVE: To evaluate the effectiveness of small interfering RNA (siRNA) on inhibiting severe acute respiratory syndrome (SARS)-associated coronavirus replication, and to lay bases for the future clinical application...OBJECTIVE: To evaluate the effectiveness of small interfering RNA (siRNA) on inhibiting severe acute respiratory syndrome (SARS)-associated coronavirus replication, and to lay bases for the future clinical application of siRNA for the treatment of viral infectious diseases. METHODS: Vero-E6 cells was transfected with siRNA before SARS virus infection, and the effectiveness of siRNA interference was evaluated by observing the cytopathic effect (CPE) on Vero-E6 cells. RESULTS: Five pairs of siRNA showed ability to reduce CPE dose dependently, and two of them had the best effect. CONCLUSION: siRNA may be effective in inhibiting SARS-associated coronavirus replication.展开更多
文摘大功率锂离子动力电池具有较高的功率密度和能量密度,在纯电动汽车和混合动力汽车中具有很大的应用价值。本文采用数值模拟的方法,建立了大功率非均匀产热动力电池组三维模型,模拟分析了基于空气单向流动冷却和往复流动冷却的Li Fe PO4动力电池组(4×6)的散热性能。结果表明,对于大功率电池正负极产热不均匀的情况,为了降低电池模块的局部温差,电池采用正负极交叉式排列组合是必要的;随着入口风速的增大,角度大小对散热性能的影响增大;周期较长时的往复通风方式不利于减小电池组局部温差,甚至在长时间内会增加局部温差。
文摘The straight chain n-Mkanes and their mixture, which can be used as phase change materials （PCM） for ther- mal energy storage, have attracted much attention in recent years. We employ the molecular dynamics （MD） simulation to investigate their thermophysical properties, including self diffusion and melting of n-octadecane with crystal and amorphous structures. Our results show that, although the initial and melted structures of n-octadecane with crystal and amorphous are different, the melting behaviors of n-octadeeane judged by the self diffusion behavior are consistent. The MD simulation indicates that both the crystal and amorphous structures are effective for the property investigation of n-octadecane and the simulated conclusion can be used as reference for modeling the alkanes-based PCM system.
文摘OBJECTIVE: To evaluate the effectiveness of small interfering RNA (siRNA) on inhibiting severe acute respiratory syndrome (SARS)-associated coronavirus replication, and to lay bases for the future clinical application of siRNA for the treatment of viral infectious diseases. METHODS: Vero-E6 cells was transfected with siRNA before SARS virus infection, and the effectiveness of siRNA interference was evaluated by observing the cytopathic effect (CPE) on Vero-E6 cells. RESULTS: Five pairs of siRNA showed ability to reduce CPE dose dependently, and two of them had the best effect. CONCLUSION: siRNA may be effective in inhibiting SARS-associated coronavirus replication.
