共查询到20条相似文献,搜索用时 706 毫秒
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基于混合蚁群算法的粮食物流中心选址优化 总被引:3,自引:0,他引:3
粮食物流中心是粮食物流系统的枢纽,粮食物流中心地址的确定是粮食物流系统分析的核心内容.根据粮食物流中心选址问题的特点和要求,在运输成本最低的基础上,构造了选址问题的数学模型,并且针对该模型引入一种混合蚁群算法,将遗传算法与蚂蚁聚类算法融合,采用遗传算法生成信息素分布,利用蚂蚁聚类算法求精确解.从而有效地避免算法的早熟现象,可防止其很快收敛到局部最优解,实例求解表明,该算法可以有效、快速地求得粮食物流中心选址问题的全局最优解. 相似文献
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This paper solves the geometrically nonlinear problems of symmetric, cross-ply laminated anisotropic rectangular plates subjected to uniformly distributed load by the higher-order shear deformation theory and taking an advantage of the perturbation and the weightedresidual method. First, with the help of the perturbation, the nonlinear partial equations have been changed into linear ones. This paper can solve these linear ones by the weighted-residual method. The combination of quintic B-spline functions are chosen as the basis of trial function and Dirac delta functtion, the weighted function. The method used in this paper is simple, direct and efficient. The numerical results show a good convergence and they are in good agreement with the available data. 相似文献
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新引进高粱雄性不育系的配合力分析 总被引:9,自引:0,他引:9
按格子方法对新引进美国高梁不育系 Tx622A、Tx623A、Tx624A 等进行了主要农艺性状的配合力分析。不育系间穗粒重、穗粒数、生育期、株高、穗长、角质含量配合力差异显著,千粒重配合力差异不显著。在全部被研究性状的遗传控制中,加性基因效应占主导。除 Tx622A 外,其余新引不育系穗粒重,穗粒数的一般配合力效应优于3197A,全部 相似文献
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In this paper,the error caused by the resistance of theMOSFET switch in the transmission of AC signals is straightforwardly derivedin combination with MOSFET physical model.The method ot decreasing transm-issiv eerror is presented. 相似文献
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Zhu Tianguo 《保鲜与加工》1988,(5)
In this paper, a dynamic substructure method for analysing the transient response of the large structure is proposed. The method is based or, the combination of the reduced dynamic-stiffness composition method and the step-by-stop integration method. Its main feature is that the computational effort may be reduced significantly. Several examples are given to prove its reliability, effectiveness and accuracy. 相似文献
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新型顺混流粮食干燥工艺的研究设计 总被引:2,自引:0,他引:2
首次对顺混流干燥机的组合工艺特点、结构特点及干燥原理进行了详细分析与论述,提出了东北三省和内蒙一区低温高水分粮食干燥采用三级顺流干燥、混流干燥、四级缓苏的顺混流多级组合干燥工艺的理想方案,优化了顺混流干燥工艺的组合方式和工艺参数,设计了HSHT15型顺混流干燥机. 相似文献
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通过试验初步研究半导体激光、紫外线以及与植物精油结合处理等非化学处理对玉米象成虫的控制作用;结果表明:低功率范围的半导体激光处理对玉米象的控制作用不佳;紫外线照射各处理组对玉米象均表现出一定的控制作用,其中254nm 20min处理组玉米象死亡率最高,并在第4d、5d与其它各组达到显著差异;物理、生物结合处理对玉米象成虫的控制作用较好,紫外(254nm 20min) 枫杨处理组最好,从第2d开始起表现出最有效的控制作用,且与其他各组差异显著,在第4d、第5d时死亡率达到了100%;非化学处理对玉米象有较好的处理作用,结合处理效果更佳,控制机理和具体参数有待于进一步研究. 相似文献
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氮气与甲酸乙酯混合熏蒸对锯谷盗的毒力研究 总被引:1,自引:0,他引:1
采用广口瓶密闭熏蒸法,在实验室条件下研究了氮气与甲酸乙酯混合熏蒸对锯谷盗成虫的毒力。结果表明,氮气和甲酸乙酯混用具有良好的熏蒸效果。在81%、87%和95%的氮气浓度下,甲酸乙酯为10μL/L熏蒸处理24h,锯谷盗的校正死亡率分别为55%、75%和97%,表明氮气可显著提高甲酸乙酯的熏蒸毒力;温度对氮气和甲酸乙酯混合熏蒸效果具有显著影响作用,相同条件下,在30℃时校正死亡率为41%,在15℃时则提高至90%,表明低温条件下熏蒸效果比高温条件下更好。 相似文献
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In combination with the migration of industrial projects to be in undated in thereservior area of The Three Gorges project, a level analysis apptoach is used to formulate a policy-making model of invest optimization for the projectS to be migrated,in which various kinds of influ-encial factor on the projects are presented quantitatively and the restriction of limited resourccs isconsidered; An effective,overall and aaplicablc policymaking approach is provided for the migrationof the Three Gorges project. 相似文献
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Li Yuansku 《保鲜与加工》1990,(4)
The main problem in optimal control of approximate period process is the optimization of periodic initial state. A fictitious control method is advanced in this paper. In combination with the link method of states between two periods, this method not only gives a quite good optimal result, but also reduces the quantity to be computed and stored. The simulation of optimal control in a water plant shows the availability of this method. 相似文献