一种气相色谱尾吹辅助柱的制备与性能研究

尾吹在毛细管色谱中起到较大作用,既提高检测器灵敏度,又减小了死体积。但由于部分生产商设计存在缺陷,给操作者带来诸多不便,如开关状态不明显,流量难以准确控制等。为克服这些缺点,我们在3 mm内径的不锈钢柱内装填5A分子筛或其它填料作为尾吹的辅助柱,并进行了可行性研究。实验结果表明这种方法是可行的。

钢梁柱辅助安装固定的装置小车

随着城市建设及电网建设的飞速发展,现在传统的变电站建设模式在逐步转变,并有了新的发展契机,钢结构装配式变电站应运而生。为了提升钢结构装配式变电站施工过程中的安全性和可靠性,降低施工风险,本文对2种辅助钢梁柱安装固定的装置小车进行了研究、探讨。

圆柱与圆锥偏斜交相贯线求法的研究

在化工设备制造中 ,首先要准确地放样下料 ,而放样下料的关键是精确地求出相贯线和素线的实长。圆柱与圆锥偏斜交相贯时 ,传统的相贯线求法是过圆柱表面上一条素线与圆锥锥顶作一辅助平面 (一般位置平面 ) ,求出该辅助平面与圆锥面的交线 ,其交线与圆柱面上素线的交点即为相贯线上的点。在分析了传统方法的特点及不足的基础上 ,提出了一种新的求解方法 ,避免了传统方法的不足。

变压器联接组别相量图画法探讨

对变压器联接组别时钟表示法与磁柱辅助法进行对比分析，指出磁柱辅助法的优点，并给出磁柱辅助法的画法步骤。

An Approximated Method of Auxiliary Sources for Large Dielectric Cylinder

In this paper, an efficient approximated method based upon the method of auxiliary sources （MAS） is proposed to solve the two-dimensional scattering problem of large, infinite dielectric cylinder. To reduce the size of the total computational cost, the formulation of the MAS is modified by minimizing the number of auxiliary sources considered to implement the solution. It is shown that the standard formulation of the method of auxiliary sources, based on placing a finite number of auxiliary sources in an interior cylinder and the same number in the exterior cylinder surrounding the physical boundary, can be replaced by a finite number of strips placed on the same interior and exterior cylinder. These strips, containing auxiliary sources, are separated by a constant angle. Thus, compared with the standard MAS, the number of auxiliary sources of the new approximated method is reduced; also the proposed method can greatly reduce the computational complexity and the memory requirement. The numerical results obtained in this paper reveal the validity of the proposed approximated method.