高频加热磁镜装置等离子体离子能量分布的测量

利用圆柱形低能离子静电分析器,对穿过高频加热磁镜装置逸出锥的逃逸离子和电荷交换生成的中性粒子的能量进行了测量,得到了等离子体离子的能量分布、离子回旋共振条件、以及发生离子回族共振时等离子体离子平均温度与加热净功率之间的线性关系。当加热净功率为100kW时,等离子体离子平均温度约为45eV。每1kW加热净功率大约提高离子温度0.4eV。     

耗散的广义对称正则长波方程周期初值问题的整体吸引子

该文考虑了带有耗散项的广义对称正则长波方程解的长时间性态.证明了周期初值问题整体吸引子的存在性,用关于时间的一致先验估计获得整体吸引子的Hausdorff和分形维数的上界估计.     

羧基膦酸改性氧化锆固定相的制备及其色谱性能

用十二胺-N乙酸-N亚甲基膦酸（DAPA）改性氧化锆制备了一种新的锆基质色谱固定相（DAPAZ），研究发现，DAPA在氧化锆表面有两种结合方式：红外光谱中1611cm^-1处的特征吸收表明羧基主要与胺基形成偶极离子，以羧酸根离子形式存在，大部分的DAPA分子通过膦酸基团与氧化锆结合；而与钼酸的显色反应则表明有少量DAPA以羧居与氧化锆结合，另外，对固定相的屏蔽效应、碱性条件（pH9．5）下的稳定性等色谱性能的研究也证实这两种吸附方式同时存在，但以膦酸基结合为主。     

基于布居振荡效应实现掺铥光纤中光波群速度减慢传输

从稳态条件下铥离子光纤的速率方程出发,得到掺铥光纤中光速减慢传输的时间延迟和相对调制衰减的数值解析表达式,利用数值求解法分别模拟计算了在大功率信号和小功率信号条件下的光速减慢传输。相对于小功率信号,大功率信号情况下的相对时延、时间延迟和群折射率都比较大,同时最大相对时延也向高频率处移动。     

基于数据流形结构的聚类方法及其应用研究

随着信息社会的不断发展,人类已经进入了信息爆炸时代,海量的数据使数据处理变得繁琐复杂,因此如何对现有的高维数据降维、聚类,并在一定程度上消除高维数据中存在的噪声是解决该问题的关键.基于相关的理论知识采用先降维后聚类的步骤,把高维数据按照子空间结构和流形结构两种情况分类,运用稀疏子空间聚类、谱多流形聚类、K-manifolds方法进行建模求解,通过对各种方法的对比,得出谱多流形聚类方法运行速度快,聚类准确度高,是最具有一般性特征的模型.     

被积函数含有绝对值的积分问题

讨论被积函数中含有绝对值的不定积分、定积分和多重积分等问题.     

Functionalized magnetic nanoparticles for drug delivery in tumor therapy

The side effects of chemotherapy are mainly the poor control of drug release. Magnetic nanoparticles(MNPs) have super-paramagnetic behaviors which are preferred for biomedical applications such as in targeted drug delivery, besides, in magnetic recording, catalysis, and others. MNPs, due to high magnetization response, can be manipulated by the external magnetic fields to penetrate directly into the tumor, thus they can act as ideal drug carriers. MNPs also play a crucial role in drug delivery system because of their high surface-to-volume ratio and porosity. The drug delivery in tumor therapy is related to the sizes, shapes, and surface coatings of MNPs as carriers. Therefore, in this review, we first summarize the effects of the sizes, shapes, and surface coatings of MNPs on drug delivery, then discuss three types of drug release systems, i.e., p H-controlled, temperature-controlled, and magnetic-controlled drug release systems, and finally compare the principle of passive drug release with that of active drug release in tumor therapy.     

基于应力比值法的V形切口应力强度因子分析

本文基于有限元分析技术建立了一种应力比值方法,用于计算V形切口的应力强度因子。该方法不需要在V形切口尖端采用反映应力奇异性的奇异单元。求解时,首先给定参考问题的广义应力强度因子,然后利用待求问题的应力值与参考问题的应力值之间的比值来求解待求问题的广义应力强度因子。算例采用切口尖端应力方法分析了平板的V形切口问题。计算结果表明,该方法计算精度较高,能够方便地用于求解相关的工程问题。     

Combined stress waves with phase transition in thin-walled tubes简

The incremental constitutive relation and governing equations with combined stresses for phase transition wave propagation in a thin-walled tube are established based on the phase transition criterion considering both the hydrostatic pressure and the deviatoric stress. It is found that the centers of the initial and subsequent phase transition ellipses are shifted along the σ-axis in the στ-plane due to the tension-compression asymmetry induced by the hydrostatic pressure. The wave solution offers the "fast" and "slow" phase transition waves under combined longitudinal and torsional stresses in the phase transition region. The results show some new stress paths and wave structures in a thin-walled tube with phase transition, differing from those of conventional elastic-plastic materials.