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Adolescents with substanceuse problems need ongoing assistance, not just a discrete program.




 To protect water quality of Tuo River, we have studied the pollutional loads and water quality and come to the conclusion that pollutants BOD and NH_3N have to be controlled.The water quality model was set up. To simulate water quality the length of 400 km of main stream was subdivided into 38 reaches.The water quality change was simulated on the computer by using the model. So it was quantitatively described that the impact of several defining parameters on water quality. A mathematical proramming called"Discrete... To protect water quality of Tuo River, we have studied the pollutional loads and water quality and come to the conclusion that pollutants BOD and NH_3N have to be controlled.The water quality model was set up. To simulate water quality the length of 400 km of main stream was subdivided into 38 reaches.The water quality change was simulated on the computer by using the model. So it was quantitatively described that the impact of several defining parameters on water quality. A mathematical proramming called"Discrete Program"was applied to the water quality planning of Tuo River for the first time. The optimized scheme of the river water pollution control have been quickly obtained by calculation. At the same time, water quality objectives and the emission standards of total amount control have been studied.  本文对沱江流域水质现状和未来污染发展趋势进行了研究,提出分江段的水质目标。用“离散规划”求出水污染控制的最优方案控制现行排污量,用总量控制标准控制今后排污量的增加,以保证规划期限内水质目标的实现。  The development, recent results and principle on the meshless, etc were described in detail. Examples were set up of meshless method governing the interpolation function program to be built and the discrete program of controlling equations. In the end, application of this method to the engineering practice was made as well as its prospect.  对无网格方法的发展状况、现有成果及基本原理等进行具体介绍,并列举了无网格方法的插值函数建立方案和控制方程的离散方案,最后就其在工程中的应用前景进行展望。  There are many discrete programming problems,in which generally the branch and bound,cutting plan or graphical operation methods are adopted to solve the linear discrete programs.No matter what method is used,much labor should be used,and the efficiency is lower.For the nonlinear discrete programs the dynamic programming method is used generally,and much time have to be consumed.For the large scale problems,whether linear or nonlinear discrete programs are solved,the existing methods are all... There are many discrete programming problems,in which generally the branch and bound,cutting plan or graphical operation methods are adopted to solve the linear discrete programs.No matter what method is used,much labor should be used,and the efficiency is lower.For the nonlinear discrete programs the dynamic programming method is used generally,and much time have to be consumed.For the large scale problems,whether linear or nonlinear discrete programs are solved,the existing methods are all restricted to the scale of problems.In addition,the methods for solving the resources allocation and knapsack problems haven't been found now.In order to solve the above problems,the paper presents a relative difference search algorithm.Calculation of five examples in this paper and other examples in other papers show that the algorithm is simple,rapid,effective and accurate.Especially the nonrestriction to the scale of problems is its main merit.  运筹学中有很多离散规划问题。其中的线性规划通常用分枝定界法或割平面法,还有图上作业法求解。不论哪种方法工作量都不小,而且效率低;至于非线性规划大都是用动态规划法求解,也很麻烦、耗时。对于大规模问题,不论线性或非线性离散规划,现有解法都受到问题规模的限制;还有资源分配和背包问题至今没有见到解决方法。本文就是为了解决这些问题,提出了相对差分搜索算法。通过5个算例和其它文献中的一些算例计算验证了本法简单、快速、有效和精确,尤其不受问题规模的限制是其最大的优点。  
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