The BZ reaction in continuous-flow stirred tank reactor (CSTR) is selected, and the chaotic time series in low CSTR flow rates have been achieved. The power spectrum method (PSM) from physics and mathematics is introd...The BZ reaction in continuous-flow stirred tank reactor (CSTR) is selected, and the chaotic time series in low CSTR flow rates have been achieved. The power spectrum method (PSM) from physics and mathematics is introduced to compute the time delay %T%, the embedded dimension %m% so as to reconstruct the state space of the chaotic BZ reaction system by the time delayed coordinates. Further analysis and characterizations on the reconstructed chaotic attractor show that the results are in agreement with the references. It indicates that PSM is faster, simpler and reliable for processing the chaotic chemical system.展开更多
A method for analyzing the dynamic energy spectrum of intense pulsed ion beam(IPIB) was proposed.Its influence on beam energy deposition in metal target was studied with IPIB produced by two types of magnetically insu...A method for analyzing the dynamic energy spectrum of intense pulsed ion beam(IPIB) was proposed.Its influence on beam energy deposition in metal target was studied with IPIB produced by two types of magnetically insulated diodes(MID).The emission of IPIB was described with space charge limitation model,and the dynamic energy spectrum was further analyzed with time-of-flight method.IPIBs generated by pulsed accelerators of BIPPAB-450(active MID) and TEMP-4M(passive MID) were studied.The dynamic energy spectrum was used to deduce the power density distribution of IPIB in the target with Monte Carlo simulation and infrared imaging diagnostics.The effect on the distribution and evolution of thermal field induced by the characteristics of IPIB dynamic energy spectrum was discussed.展开更多
鉴于调谐质量阻尼器(tuned mass damper,TMD)耗能结构在考虑土-结构相互作用(soil-structure interaction,SSI)时,随机地震响应分析方法较为复杂,本文提出一种计算响应谱矩和方差的简明解法,并深入研究SSI效应下结构随机地震动的响应特...鉴于调谐质量阻尼器(tuned mass damper,TMD)耗能结构在考虑土-结构相互作用(soil-structure interaction,SSI)时,随机地震响应分析方法较为复杂,本文提出一种计算响应谱矩和方差的简明解法,并深入研究SSI效应下结构随机地震动的响应特性。首先,根据达朗贝尔原理建立考虑SSI效应的TMD耗能结构的地震动方程,利用有限元动力技术建立基于实模态分解法的TMD耗能结构地震动一般方程;其次,利用功率谱二次式分解法推导出基于杜修力地震动激励的结构位移、TMD位移、基础平动和转动位移响应的0阶—2阶谱矩的简明封闭解;最后,通过算例,验证所提方法并研究了考虑SSI效应的TMD耗能结构地震响应特性。结果表明:在基础固定的情况下,场地土为中硬土、中软土和软弱土时,以层间位移为指标的动力可靠度、结构顶层位移逐渐变大,SSI效应逐渐显著;TMD在各种场地条件下都具有良好的减震效果,且最优参数受场地影响较小。与传统方法相比,本文方法计算过程更为简便,精度更高,能更高效地应用于实际工程。展开更多
文摘The BZ reaction in continuous-flow stirred tank reactor (CSTR) is selected, and the chaotic time series in low CSTR flow rates have been achieved. The power spectrum method (PSM) from physics and mathematics is introduced to compute the time delay %T%, the embedded dimension %m% so as to reconstruct the state space of the chaotic BZ reaction system by the time delayed coordinates. Further analysis and characterizations on the reconstructed chaotic attractor show that the results are in agreement with the references. It indicates that PSM is faster, simpler and reliable for processing the chaotic chemical system.
基金supported by the National Natural Science Foundation of China(No.11175012)the National Magnetic Confinement Fusion Program(No.2013GB109004)
文摘A method for analyzing the dynamic energy spectrum of intense pulsed ion beam(IPIB) was proposed.Its influence on beam energy deposition in metal target was studied with IPIB produced by two types of magnetically insulated diodes(MID).The emission of IPIB was described with space charge limitation model,and the dynamic energy spectrum was further analyzed with time-of-flight method.IPIBs generated by pulsed accelerators of BIPPAB-450(active MID) and TEMP-4M(passive MID) were studied.The dynamic energy spectrum was used to deduce the power density distribution of IPIB in the target with Monte Carlo simulation and infrared imaging diagnostics.The effect on the distribution and evolution of thermal field induced by the characteristics of IPIB dynamic energy spectrum was discussed.
文摘鉴于调谐质量阻尼器(tuned mass damper,TMD)耗能结构在考虑土-结构相互作用(soil-structure interaction,SSI)时,随机地震响应分析方法较为复杂,本文提出一种计算响应谱矩和方差的简明解法,并深入研究SSI效应下结构随机地震动的响应特性。首先,根据达朗贝尔原理建立考虑SSI效应的TMD耗能结构的地震动方程,利用有限元动力技术建立基于实模态分解法的TMD耗能结构地震动一般方程;其次,利用功率谱二次式分解法推导出基于杜修力地震动激励的结构位移、TMD位移、基础平动和转动位移响应的0阶—2阶谱矩的简明封闭解;最后,通过算例,验证所提方法并研究了考虑SSI效应的TMD耗能结构地震响应特性。结果表明:在基础固定的情况下,场地土为中硬土、中软土和软弱土时,以层间位移为指标的动力可靠度、结构顶层位移逐渐变大,SSI效应逐渐显著;TMD在各种场地条件下都具有良好的减震效果,且最优参数受场地影响较小。与传统方法相比,本文方法计算过程更为简便,精度更高,能更高效地应用于实际工程。
