云铜凯通因分特顶吹熔炼炉生产实践及改进措施

通过对云铜凯通因分特炉的生产现状与国内外顶吹熔池熔炼炉对比分析,找出问题并提出近期的改进措施。     

Design and Implementation of a Class of Robust H ∞ Control for Stability Enhancement in Power Systems

The paper presents a method of designing a class of robust H X generator excitation controller in a power system. The proposed controller is utilized to damp inter-area oscillations and enhance power system stability. The robust controller design procedure for a linear composite system is presented in terms of positive definite solutions to modified algebraic inequalities. The resulting controller guarantees closed-loop stability and an H X -norm bound on disturbance attenuation. The effectiveness of the H X controller is demonstrated through digital simulation studies on a two-machine system. The digital simulation studies are conducted using a PSCAD/EMTDC software package. The simulation results show that the controller contributes significantly to the damping of inter-area oscillations and the enhancement of power system stability during disturbances.     

Robust and efficient surface reconstruction from contours

We propose a new approach for surface recovery from planar sectional contours. The surface is reconstructed based on the so-called “equal importance criterion,” which suggests that every point in the region contributes equally to the reconstruction process. The problem is then formulated in terms of a partial differential equation, and the solution is efficiently calculated from distance transformation. To make the algorithm valid for different application purposes, both the isosurface and the primitive representations of the object surface are derived. The isosurface is constructed by means of a partial differential equation, which can be solved iteratively. The traditional distance interpolating method, which was used by several researchers for surface reconstruction, is an approximate solution of the equation. The primitive representations are approximated by Voronoi diagram transformation of the surface space. Isosurfaces have the advantage that subsequent geometric analysis of the object can be easily carried out while primitive representation is easy to visualize. The proposed technique allows for surface recovery at any desired resolution, thus avoiding the inherent problems of correspondence, tiling, and branching.     

欲望无限：读列维纳斯的《整体与无限》

《整体与无限》是列维纳斯的重要著作。在这部著作中，列维纳斯构建了他的他者伦理学。其中，欲望、无限是其理论的核心概念。列维纳斯认为，欲望与需求不同，欲望是形而上学的，是对无限他者的欲求。无限是一种绝对他性，它在面貌中显示自身，是自我从内在性桎梏中挣脱出来，超越的方向。这种向无限超越的欲望使得主体从存在中出离，与整体性、同一性决裂，迎接他者的召唤，担负起对他人的义不容辞的责任。     

Multiple positive solutions for singular BVPs on the positive half-line

In this work, we are concerned with the existence of multiple positive solutions to a second-order nonlinear singular boundary value problem set on the positive half-line. We mainly use the Krasnozels’ki and Leggett–Williams fixed point theorems in cones to prove existence of one positive solution, two positive solutions and three positive solutions. The results complement, extend and correct some recent ones.     

DIC显微术及在大气颗粒物观察中应用的研究

微分干涉相衬(DIC)显微术使用诺马斯基棱镜完成光束的分割、合成,合成光束发生干涉,将样品上各部分折射率、厚度的变化率或表面起伏的不同转化为像面上光强的差别,故像面是物面的微分。DIC与无限远光学系统的结合,减小了棱镜、检偏器的插入引起的负面影响。将该DIC应用于PM2.5大气颗粒物的研究,得到了优于其它显微术的图像。     

一个由接口路径求Hamilton回路的算法研究

为了求简单图中的所有Hamilton回路,首先,提出了一种对集合幂集进行编码的算法,引入了接口路径的概念,将Hamilton回路的运算转换为等级接口路径矩阵的运算;其次,结合肖尔茨猜想的证明,对算法复杂性的上限进行了估算;最后,以中国旅行商问题为例,给出了求解CTSP的精确算法.     

Pseudo-isochronicity in a class of septic differential systems

This paper deals with the pseudo-isochronicity for a class of septic differential systems. In this paper, we transform infinity into the origin so that the properties of infinity can be investigated with the methods developed for finite critical points. By calculating the singular point quantities and period constants of the origin, the problem of infinity being a pseudo-isochronous center has been solved in this case.