The SF6 decomposed products are very alike,so the peaks of the SF6 decomposed products are overlapped.It make us hard to quantitatively calculate.This paper introduced a method to separate the overlapped chromatogram ...The SF6 decomposed products are very alike,so the peaks of the SF6 decomposed products are overlapped.It make us hard to quantitatively calculate.This paper introduced a method to separate the overlapped chromatogram peaks with iterative curve-fitting and Gauss function,and deduced the formula of the iterative curve-fitting;provided a method to calculate the initial value of the peaks intensity and width by iterative formula,and confirm the final peaks intensity and width to separate the overlapped signals.By the analysis of the real chromatogram data,it proved the validity of this method on the main components used in distinguishing the GIS internal defects.This method overcomes the influence of SF6 peak to the other thin concentration peaks,so it can be used in the study of the quantitative analysis of the decomposed products on different failures and different voltages.展开更多
为准确选取模拟节理岩体结构面产状互相关性的Copula函数,提出了不同拟合指标下模拟节理岩体结构面产状的Copula函数方法,通过采用最小平方欧式、AIC(Akaike information criterion)信息准则、BIC(Bayesian information criterion)信息...为准确选取模拟节理岩体结构面产状互相关性的Copula函数,提出了不同拟合指标下模拟节理岩体结构面产状的Copula函数方法,通过采用最小平方欧式、AIC(Akaike information criterion)信息准则、BIC(Bayesian information criterion)信息准则这3种拟合指标确定各自的最优Copula函数并通过MATLAB确定实测产状数据的最优边缘分布,建立倾角和倾向的二维联合分布函数。同时结合蒙特卡洛抽样法自动生成模拟数据,将数据导入Dips软件中进行可视化处理,得到产状的赤平投影图,对比实测的倾角和倾向数据和不同拟合指标下确定的Copula函数模拟数据间的差异。最后,基于工程案例检验方法的有效性。结果表明:不同的拟合指标会产生不同的Copula函数,对模拟产状的有效性也会有较大差异,若是选择不当的拟合指标可能导致选择不准确的Copula函数,从而使模型无法准确地捕捉数据的相关结构和特征;不适当的拟合指标可能导致拟合模型与真实数据之间存在较大的误差,使得模型的预测能力和解释能力下降,就本文案例表明在最小平方欧式值拟合指标下选择的Gaussian Copula函数拟合实测数据效果最好。此研究将有助在应用Coupla函数时选用恰当的拟合指标。展开更多
为解决现有微通道散热技术存在的不足和电子散热需求多元化的发展趋势,提出一种蛛网型微通道热沉结构,并对其几何结构参数进行了多目标优化来提升蛛网形微通道热沉的综合性能。采用Box-Behnken设计方法,对热沉的槽宽、翅宽、槽深设计变...为解决现有微通道散热技术存在的不足和电子散热需求多元化的发展趋势,提出一种蛛网型微通道热沉结构,并对其几何结构参数进行了多目标优化来提升蛛网形微通道热沉的综合性能。采用Box-Behnken设计方法,对热沉的槽宽、翅宽、槽深设计变量进行响应曲面分析,拟合出蛛网形微通道的温度与压降函数;以拟合后的两函数为目标函数,用多目标粒子群寻优算法得到Pareto解集,并使用逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)从Pareto解集中进行选择。结果表明,Pareto解集为不同状况下的最优解,温度与压降函数的多元统计系数R^(2)分别为0.9996和0.9984,表明拟合函数的精确度高。优化后的结构与原设计相比,不仅平均温度降低了3 K,压降也降低了1514 Pa,综合性能显著提升,表明合理的通道结构设计可以进一步提高微通道热沉的综合性能。展开更多
基金Project Supported by National Natural Science Foundation of China ( 50777070), Science and Technique Project of Chongqing (CSTC, 2007AC2041 ).
文摘The SF6 decomposed products are very alike,so the peaks of the SF6 decomposed products are overlapped.It make us hard to quantitatively calculate.This paper introduced a method to separate the overlapped chromatogram peaks with iterative curve-fitting and Gauss function,and deduced the formula of the iterative curve-fitting;provided a method to calculate the initial value of the peaks intensity and width by iterative formula,and confirm the final peaks intensity and width to separate the overlapped signals.By the analysis of the real chromatogram data,it proved the validity of this method on the main components used in distinguishing the GIS internal defects.This method overcomes the influence of SF6 peak to the other thin concentration peaks,so it can be used in the study of the quantitative analysis of the decomposed products on different failures and different voltages.
文摘为准确选取模拟节理岩体结构面产状互相关性的Copula函数,提出了不同拟合指标下模拟节理岩体结构面产状的Copula函数方法,通过采用最小平方欧式、AIC(Akaike information criterion)信息准则、BIC(Bayesian information criterion)信息准则这3种拟合指标确定各自的最优Copula函数并通过MATLAB确定实测产状数据的最优边缘分布,建立倾角和倾向的二维联合分布函数。同时结合蒙特卡洛抽样法自动生成模拟数据,将数据导入Dips软件中进行可视化处理,得到产状的赤平投影图,对比实测的倾角和倾向数据和不同拟合指标下确定的Copula函数模拟数据间的差异。最后,基于工程案例检验方法的有效性。结果表明:不同的拟合指标会产生不同的Copula函数,对模拟产状的有效性也会有较大差异,若是选择不当的拟合指标可能导致选择不准确的Copula函数,从而使模型无法准确地捕捉数据的相关结构和特征;不适当的拟合指标可能导致拟合模型与真实数据之间存在较大的误差,使得模型的预测能力和解释能力下降,就本文案例表明在最小平方欧式值拟合指标下选择的Gaussian Copula函数拟合实测数据效果最好。此研究将有助在应用Coupla函数时选用恰当的拟合指标。
文摘为解决现有微通道散热技术存在的不足和电子散热需求多元化的发展趋势,提出一种蛛网型微通道热沉结构,并对其几何结构参数进行了多目标优化来提升蛛网形微通道热沉的综合性能。采用Box-Behnken设计方法,对热沉的槽宽、翅宽、槽深设计变量进行响应曲面分析,拟合出蛛网形微通道的温度与压降函数;以拟合后的两函数为目标函数,用多目标粒子群寻优算法得到Pareto解集,并使用逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)从Pareto解集中进行选择。结果表明,Pareto解集为不同状况下的最优解,温度与压降函数的多元统计系数R^(2)分别为0.9996和0.9984,表明拟合函数的精确度高。优化后的结构与原设计相比,不仅平均温度降低了3 K,压降也降低了1514 Pa,综合性能显著提升,表明合理的通道结构设计可以进一步提高微通道热沉的综合性能。