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Numerical simulation of a class of fractional subdiffusion equations via the alternating direction implicit method 下载免费PDF全文
Wenjuan Yao Jiebao Sun Boying Wu Shengzhu Shi 《Numerical Methods for Partial Differential Equations》2016,32(2):531-547
In this article, a new numerical technique is proposed for solving the two‐dimensional time fractional subdiffusion equation with nonhomogeneous terms. After a transformation of the original problem, standard central difference approximation is used for the spatial discretization. For the time step, a new fractional alternating direction implicit (FADI) scheme based on the L1 approximation is considered. This FADI scheme is constructed by adding a small term, so it is different from standard FADI methods. The solvability, unconditional stability and H1 norm convergence are proved. Finally, numerical examples show the effectiveness and accuracy of our proposed method. © 2015 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 32: 531–547, 2016 相似文献
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本文讨论了非交换除环D上的特殊二次方程(x-β)(x-α)=0的右零点分布问题,并且由此而得到了一种求解四元数环R(i,j,k)上的二次方程x2+ax+b=0的新方法。 相似文献
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Yanqing Fan Jing He Lin Liu Guoqin Liu Shengzhu Guo Zhe Lian Xiaonan Li Weijie Guo Xuebo Chen Ying Wang Hua Jiang 《Angewandte Chemie (International ed. in English)》2023,62(28):e202304623
We report the synthesis and chiroptical properties of novel chiral carbon nanorings S p-/Rp-[12]PCPP containing a planar chiral [2.2]PCP unit, and demonstrate that S p-/Rp-[12]PCPP can not only host crown ether 18-Crown-6 to form ring-in-ring complexes with a binding constant 3.35×103 M−1, but also accommodate the complexes of 18-Crown-6 and S/R-protonated amines to form homochiral S @Sp -/ R @Rp - and heterochiral S @Rp -/ R @Sp - ternary complexes, displaying significantly larger binding constants of up to 3.31×105 M−1 depending on the chiral guests. Importantly, homochiral S @Sp -/ R @Rp - ternary complexes exhibit an enhanced CD signal, while the heterochiral S @Rp -/ R @Sp - ones have a constant CD signal compared with the chiral carbon nanorings, respectively, which suggests that homochiral S @Sp -/ R @Rp - ternary complexes display a highly narcissistic chiral self-recognition for S/R-protonated chiral amines, respectively. Finally, the chiral ternary complexes can be further applied to determine the ee values of chiral guests. The findings highlight a new application of carbon nanorings in supramolecular sensors, beyond the common recognition of π-conjugated molecules. 相似文献
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校正变换矩阵法及其在多组分直接同时测定中的应用 总被引:4,自引:0,他引:4
将目标变换因子分析中自由浮动技术引入多元校准中,提出了一种新的多组分同时校准法———校正变换矩阵法。该法用于四组分氨基酸人工混合样品分析,结果令人满意,通过与传统目标变换因子分析法比较研究,表明该法用于组分光谱严重共线的波长范围时,其校准能力大大优于传统目标变换法。 相似文献
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Cao Shengzhu Zhou Hui Feng Yudong Zhang Kaifeng Wu Gan Xiong Yuqing Wang Hu Zhou Chao 《Journal of Thermal Analysis and Calorimetry》2021,146(5):2317-2321
Thermal deformation of space-borne radar antenna caused by dramatic changes in orbit thermal environment has a serious effect on image qualities. In this paper, the NX TMG module was used to simulate the orbit thermal environment of the antenna, and a thermal control design was proposed. The thermal control structure consists of three layers; the top is a radiator with high emissivity surface, the middle is a multi-layer insulation, and the bottom is a highly reflective layer. The simulation results show that the thermal design could reduce the temperature gradient from 238.1 to 31.4 °C effectively.
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