In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A...In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A narrow peak of the fidelity is observed at the level-crossing point,which does not appear at the avoided-crossing point.Therefore fidelity is perfectly suited for detecting the level-crossing point in the energy spectrum.展开更多
The use of prediction error to optimize the number of splitting rules in a tree model does not control the probability of the emergence of splitting rules with a predictor that has no functional relationship with the ...The use of prediction error to optimize the number of splitting rules in a tree model does not control the probability of the emergence of splitting rules with a predictor that has no functional relationship with the target variable. To solve this problem, a new optimization method is proposed. Using this method, the probability that the predictors used in splitting rules in the optimized tree model have no functional relationships with the target variable is confined to less than 0.05. It is fairly convincing that the tree model given by the new method represents knowledge contained in the data.展开更多
由于计算电容原理在电磁计量领域具有极高的准确度,将其应用在传感器的研制上具有重要的现实意义。针对传统双层套筒的电容式液位传感器在加工及装配过程中极易引入误差、存在毛细现象等问题,首次将计算电容原理运用在燃料液位测量领域...由于计算电容原理在电磁计量领域具有极高的准确度,将其应用在传感器的研制上具有重要的现实意义。针对传统双层套筒的电容式液位传感器在加工及装配过程中极易引入误差、存在毛细现象等问题,首次将计算电容原理运用在燃料液位测量领域,对计算电容原理进行深入研究,设计新的计算电容结构并对其进行修正,同时结合新的结构建立新的燃料液位测量模型,得出相应的修正系数及液位测量公式。最后,以纯度为99.8%的无水乙醇作为被测燃料进行液位测量试验,燃料液位变化范围为180 mm,输出电容值在0.6 p F^17 p F之间,实验结果表明:燃料液位与传感器输出电容值具有良好线性关系,线性度达到0.48%。该研究为计算电容原理在工程中的应用奠定了理论基础。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 1097602/A06)
文摘In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A narrow peak of the fidelity is observed at the level-crossing point,which does not appear at the avoided-crossing point.Therefore fidelity is perfectly suited for detecting the level-crossing point in the energy spectrum.
文摘The use of prediction error to optimize the number of splitting rules in a tree model does not control the probability of the emergence of splitting rules with a predictor that has no functional relationship with the target variable. To solve this problem, a new optimization method is proposed. Using this method, the probability that the predictors used in splitting rules in the optimized tree model have no functional relationships with the target variable is confined to less than 0.05. It is fairly convincing that the tree model given by the new method represents knowledge contained in the data.
文摘由于计算电容原理在电磁计量领域具有极高的准确度,将其应用在传感器的研制上具有重要的现实意义。针对传统双层套筒的电容式液位传感器在加工及装配过程中极易引入误差、存在毛细现象等问题,首次将计算电容原理运用在燃料液位测量领域,对计算电容原理进行深入研究,设计新的计算电容结构并对其进行修正,同时结合新的结构建立新的燃料液位测量模型,得出相应的修正系数及液位测量公式。最后,以纯度为99.8%的无水乙醇作为被测燃料进行液位测量试验,燃料液位变化范围为180 mm,输出电容值在0.6 p F^17 p F之间,实验结果表明:燃料液位与传感器输出电容值具有良好线性关系,线性度达到0.48%。该研究为计算电容原理在工程中的应用奠定了理论基础。
