间断常系数抛物方程组特征修正区域分解有限元法

研究了间断常系数抛物型方程组，应用特征修正区域分解有限元方法处理此问题．定义了一个函数，用这个函数在前一时间层的值近似在剖分子区域相交界面上的法向导数值，使得问题在子区域上是相互独立的，从而实现了并行．并给出了收敛性分析和L^2模误差估计.     

改进的GE分布式并行算法

针对一维抛物方程的初边值问题，在分组显式(GE)并行解法的基础之上，利用冗余计算来遮盖部分通信的重叠边界优化技术，结合曙光-2000并行计算机系统，得到了一个通信时问缩短、并行效率提高的分布式并行算法。     

线性抛物型积分微分方程的扩展混合有限元方法

采用扩展混合元方法处理二阶线性抛物型积分微分方程，通过此混合元方法，可以同时高精度逼近三个变量：未知纯量函数，未知函数的梯度以及流体流量．构造了关于时间为半离散的扩展混合元格式，并进行了详细的理论分析．得到了最优阶的L^2-模误差估计结果．     

Induction of nicotine in tobacco by herbivory and its relation to glucose oxidase activity in the labial gland of three noctuid caterpillars

Tobacco Nicotiana tabacum L. is a host plant ofHelicoverpa armigera (Huibner), Helicoverpa assulta Guenee and Spodoptera litura (Fabricius) (Lepidoptera, Noctuidae). The difference in leaf nicotine response to the feeding by these three larvae and the mechanical simulation of their feeding was examined by HPLC. Results indicated that nicotine induction was suppressed by H. armigera and H. assulta larvae feeding or by simulated damage treated with their labial glands extracts. The production of nicotine was also suppressed by the glucose oxidase from Aspergillus niger when it was treated on mechanically wounded leaf area. On the contrary, the nicotine production was stimulated by S. litura larva feeding or by simulated damage treated with its labial gland extract. Heat denature can not counteract the stimulation effect of the S. litura labial gland extracts to tobacco nicotine production. The glucose oxidase activity was detected in labial gland extracts of both H. armigera and H. assulta, but the activity in H. armigera was significantly higher than that in H. assulta. No glucose oxidase activity was detected in labial gland extracts of S. litura. It is shown that the glucose oxidase activity in labial glands of caterpillars plays an important role in the nicotine response to herbivory. The glucose oxidase was mainly contained in the labial gland of H. armigera larva, and had the highest activity at pH 7.0. D-Glucose was the optimal substrate of the glucose oxidase. Labial gland glucose oxidase activities varied daily during larval development with high activities found when larvae were actively feeding.     

动态电子商务的构架分析与模式创新研究

从电子商务的发展与电子商务模式出发，全面分析了动态电子商务原理、构架、实现及其模式，并对动态电子商务模式的创新进行了分析。     

抛物方程非特征柯西问题的分数次Tikhonov方法

讨论了一个不适定的抛物方程的非特征柯西问题,为了解决这个问题,采用了分数次Tikhonov正则化方法,并提出先验和后验两种参数选取规则下的稳定误差估计。     

带有梯度超线性项抛物方程黏性解的比较原理

研究梯度具有超线性增长的完全非线性抛物方程问题,证明了具有超线性增长的半连续黏性上下解的比较原理的存在,并且把此结果延伸到单调抛物系统中。     

微信电子商务应用价值分析

移动商务发展到现在,在应用层面上最广泛的就是专属APP和基于微信平台上开发的商务应用.微信平台以其应用广泛,粘合度高已成为众多商家特别是第三产业企业应用的首选.从微信商业发展入手,系统讨论微信商业价值形式,能为商业开发应用研究给出一些较为完整的理念,促进移动电子商务应用发展.     

初道屏蔽效应对低能电子碰撞H(e,2e)反应的影响

考虑初道屏蔽效应,研究了低能电子碰撞H(e,2e)的反应过程.计算了共面非对称几何条件下能量为27.2 eV的入射电子碰撞H(e,2e)反应的三重微分截面(TDCS),将其计算结果与3C、DS3C和CDS3C模型所得结果及实验数据进行了比较,结果表明CDS3C模型能对上述碰撞过程成功描述,改善了与实验结果的符合程度.     

抛物型微分方程的Crank-Nicolson块中心差分方法

针对有界区域上的抛物型微分方程讨论了Crank-Nicolson块中心差分法, 在非等距剖分的网格上得了近似解和解的一阶导数的L2模误差估计,重要的是提高了时间上的精度. 数值试验结果与理论分析一致,说明格式具有高效的收敛性.