共查询到19条相似文献,搜索用时 62 毫秒
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根据特定峰信号微分的极值和过零点随着微分阶次的变化而改变, 建立了峰信号的极值和过零点与其相应微分阶次的关系式, 进而得到了两类参数估计器, 利用这些估计器可以估计出Gaussian峰、Lorentzian峰和Tsallis峰信号的特征参数. 首先, 利用分数阶微分器获得特定峰信号的分数阶微分; 其次, 根据峰信号的极值与其微分阶次的关系式和过零点与其微分阶次的关系式, 建立了估计器Ⅰ和估计器Ⅱ; 再利用这些估计器便可以提取峰信号的特征参数; 最后, 用Tsallis峰作为子峰模型对未知重叠峰信号进行分辨. 仿真和实测重叠峰信号的分辨实验表明本方法简单高效. 相似文献
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本文探讨采用平方根卡尔曼滤波进行卷积伏安重叠峰的分辨.模拟数据试验表明,1∶N平方根卡尔曼滤波器、结合标准加入法和快速傅里叶变换,用于重叠峰的分辨,具有较高的准确度和较强的分辨能力,滤波结果有良好的线性关系.用于In(Ⅲ)~Cd(Ⅱ)重叠响应信号的分辨,获得满意结果 相似文献
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Equations between the differential order and the maximum of the fractional-order differential for the specified peak signals are developed based on the variation of the maximum of the specified peak signals at different orders. Also, equations between the differential order and the zero-crossing of the fractional-order differential of the specified peak signals are proposed according to the variation of the zero-crossing of the specified peak signals at different orders. Characteristic paramters of the Gaus- sian peak, Lorentzian peak, and Tsallis peak can be estimated using estimator I and estimator II which are obtained by the equations above. As a result, a new method is presented to resolve the overlapped peaks signal. Firstly, a fractional-order differential of the specified peak signals is obtained with the fractional-order differentiation filter. Then, characteristic paramters of the specified peak signals can be extracted using estimator I and estimator II. Finally, the Tsallis peak is used as a model to assign the overlapping peak signals correctly. Experimental results show that the proposed method is efficient and effective for the simulated overlapping peaks and detected overlapping voltammetric peak signals. 相似文献
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With the computer simulations, it has been found that in Differential Thermal Analysis (DTA) the overlapped peaks do not satisfy
the linear overlapping principle, and the relationship between the overlapped peaks is rather complex that is a function of
sample thermal conductivity, specific heat, quantity and latent heats, etc. If the first point where the two peaks begin to
overlap is at the posterior half of the first peak curve and the two overlapped peaks can be identified by two different peaks,
from the curve of overlapped peaks we can know that the temperature corresponding to the first point deviating from the sample's
first phase change curve is the sample's second phase change temperature.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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This paper introduces the Independent Components Analysis (ICA) to voltammetry and extends possibility of the qualitative and quantitative analysis of binary mixtures of similar oxidation/reduction potentials. It was demonstrated that even in the case of distance between peaks potentials equal to 10 mV, determinations may be realized according to typical validation criteria. The methodology was presented using the simulated data and capabilities and limitations of the method were described. Further, the usefulness of ICA was presented for voltammograms registered during simultaneous determination of copper and antimony, and thallium and indium. The results of high practical importance for chemical analysis were achieved and documented. In the quantitative analysis a property was extensively used, that ICA is an unsupervised method. 相似文献
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完全重叠色波二维谱的解析新方法 总被引:3,自引:0,他引:3
提出一种新的完全重叠色波二维谱解析方法。对于两组分色谱-光谱数据阵,只要在重叠区中存在单组分区,就能解得各组分的纯色谱和纯光谱,这种方法将求解纯谱问题转化为优化问题,再用数值遗传算法寻找最优解.本法用于2,4-二硝基苯酚和3,5-二硝基苯甲酸的合成实验以及四环素的杂质分析都得到满意的结果. 相似文献
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对于两组份色谱重叠峰体系,当以小组份色谱峰作为干扰时,本文利用正交投影方法,通过构造正交投影矩阵,利用原始信号及其投影与背景之间的内在关系来确定真实背景,从而将背景干扰予以扣除,使含背景干扰的一维重叠色谱峰得以分辨。模拟研究表明,对于两组份色谱峰重叠体系当以小色谱峰为干扰时本文方法具有很好的分辨效果,对于完全重叠峰,即使其峰分离度为零能得到满意的结果。 相似文献
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本从色谱峰的EMG模型出发,通过对重叠色谱峰的模拟和回归分析,提出了一种三元重叠色谱峰的面积的定量方法,三元重叠色谱峰的每一个峰面积可以由峰面积比和总面积求得,此法所需的数据都由实验色谱图上测得,峰面积计算结果的相对误差小于±5%,适用于相对峰谷为50%-95%的三元重叠色谱峰面积的定量。 相似文献
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人工神经网络方法用于脉冲极谱重叠峰解析 总被引:2,自引:0,他引:2
将人工神经网络用于脉冲极谱法中Pb和Tl重叠信号峰的解析,对神经网络参数的影响及优化作了研究。结果表明,网络的增益,学习速率和动量是影响网络收敛和稳定性的关键参数。本文还将神经网络与偏最小二乘法的计算结果作了比较。 相似文献
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将分形理论用于仪器分析信号的解析,提出一种面向分析谱图中重叠信号处理的分形分辨算法.通过对信号进行分形分析,采用分形维数可有效地反映信号的特征,准确地得到谱峰个数和位置的信息,避免人为判断的误差,实现重叠复合信号的分辨.实验表明,这种新的重叠谱峰分辨法能用于光谱、电化学、色谱等仪器分析数据的处理 相似文献