On Poljak's improved subgradient method

Poljak has suggested an improved subgradient method and provided a lower bound on the improvement of the Euclidean distance to an optimal solution. In this paper, we provide a stronger lower bound and show that the direction of movement in this method forms a more acute angle with the direction toward the set of optimal solutions than that in the subgradient method.Most of this research has been performed while the first author was visiting the Decision and Information Systems Department, College of Business, Arizona State University, Tempe, Arizona.     

CO_2激光切雕机及其加工工艺的研究

一种可用于雕刻和切割非金属的新型ＣＯ２激光设备。介绍了这套设备各部分的结构特点、工作原理以及计算机软件的工作原理。并简述了该设备进行雕刻和切割时的工艺参数。     

用于微细圆弧加工的激光刻录机

声盘、视及光的亚微米圆弧线一般通过激光刻录机光刻制造，本文结合我国开发的用于磁盘伺服图形录写的激光刻录机，从机械结构、光路系统及计算机控制系统等方面，对其进行了研究分析。     

Mixed-integer bilinear programming problems

This paper addresses a class of problems called mixed-integer bilinear programming problems. These problems are identical to the well known bilinear programming problems with the exception that one set of variables is restricted to be binary valued, and they arise in various production, location—allocation, and distribution application contexts. We first identify some special cases of this problem which are relatively more readily solvable, even though their continuous relaxations are still nonconvex. For the more general case, we employ a linearization technique and design a composite Lagrangian relaxation-implicit enumeration-cutting plane algorithm. Extensive computational experience is provided to test the efficacy of various algorithmic strategies and the effects of problem data on the computational effort of the proposed algorithm.     

Cutting by a high power laser at a long distance without an assist gas for dismantling

As the applications of laser processing progress, new fields of use are being investigated, including dismantling with power lasers. To fulfil our dismantling requirements we propose a new laser method that we have called the laser dismantling (LD) process. This cutting method uses a high-power laser at a long distance, without an assist gas, and with a focal length of the system of 1 m to 10 m. Precision and accuracy in the process are not the same as for laser cutting for production and assembly. The first application of the laser dismantling process, on which we demonstrate our method, is the dismantling of obsolete nuclear plants with remote controlled, or automatic, robots in irradiated environments. For our demonstrator, the beam from a Nd:YAG laser was focused by a multimode optical fibre. The objectives of this paper are: to discuss the criteria for determining the theoretical feasibility of LD; to discuss issues related to future industrial implementation by introducing the process's basic principles; and to compare LD with classical laser processing, which differs not only in the consideration of cutting quality and speed, but also in the cutting irregularities that could be accepted.     

Lp-based combinatorial problem solving

A tutorial outline of the polyhedral theory that underlies linear programming (LP)-based combinatorial problem solving is given. Design aspects of a combinatorial problem solver are discussed in general terms. Three computational studies in combinatorial problem solving using the polyhedral theory developed in the past fifteen years are surveyed: one addresses the symmetric traveling salesman problem, another the optimal triangulation of input/output matrices, and the third the optimization of large-scale zero-one linear programming problems.     

Energy transfers between Sm and Eu in YPO4, LaP5O14 and LaP3O9 phosphates. Potential quantum cutters for red emitting phosphors

This work concerns the studies of energy transfers between Sm³⁺ and Eu³⁺ ions in some phosphates as new luminescent materials emitting in the orange-red color. The choose of ions is based on the possibility of quantum cutting process and the matrices are selected according to the 5d bands position of Sm³⁺ ion. The Sm³⁺ and Eu³⁺ doped YPO₄, LaP₅O₁₄ and LaP₃O₉ are synthesized and spectroscopic studies in ultraviolet and vacuum ultraviolet ranges have been achieved.     

Direct observation of surface and internal phase-separated structure of the active layer buried in organic photovoltaic cells

A phase-separated structure of the active layer, of variable thickness, buried in organic thin film solar cells (OTSC) was directly observed by scanning force microscopy (SFM) with the aid of a surface and interface cutting analysis system (SAICAS). This deals with SFM observation to both the surface and the internal regions of the OTSCs, leading to discussion about the formation of the overlayer in the active layer.     

位置控制在HX-500E分断机中的应用

简述了HX500E玻璃分断机所以能切割特殊ITO玻璃的设计特点、工作原理及工艺过程,介绍了该机运动机构及控制组成,并以平台伺服的选型为例,介绍了伺服系统电机的选型方法,三菱定位模块FX2N-1PG的使用特点及应用,FX2N-1PG模块在位置控制中利用近点检测法和伺服编码器Z相脉冲组合完成伺服回归机械原点的方法,并指出了一些位置控制原点回归方法注意事项.     

动光式激光切割无缝拼接技术的研究与应用

为了提高动光式激光切割振镜加工网格之间的拼接精度,首先采用线性插值方法,补偿激光光点在不同区域内两轴的区域系数,再利用射影变换建立任意两个平面之间点的射影变换矩阵,以补偿双振镜的梯形以及菱形畸变,通过上述补偿保证整个扫描场中所有的坐标都符合一个线性的比例关系。将该方法应用于柔性印制电路板的切割,得到的切割精度和效率远高于普通的定光式切割。结果表明,通过以上方法的补偿后,激光切割系统的网格之间拼接精度大幅度提升,达到国外最新同类系统的精度与效率,具有广阔的应用前景。