Model and Algorithm of Transportation Problem on Network

Transportation problem on network needs to determine the freight quantity and the transportation route between supply point and demand point. Therefore, taken the uncertainty of freight supply and demand into account, a collaborative optimization model is formulated with transportation capacity constraint. In addition, a two-stage genetic algorithm （GA） is put forward. Herein, the first stage of this GA is adopted a priority-based encoding method for determining the supply and demand relationship between different points. Then supply and demand relationship which the supply and the demand are both greater than zero is a minimum cost flow （MCF） problem on network in the second stage. Aim at the purpose to solve MCF problem, a GA is employed. Moreover, this algorithm is suitable for balance and unbalance transportation on directed network or undirected network. At last, the model and algorithm are verified to be efficient by a numerical example.     

丽格海棠的组织培养

以MS为基本培养基，以丽格海棠为实验材料，通过研究不同培养基对分化的影响、相同培养基对不同切块及切块上芽分布多少对分化快慢的影响。     

冷冻干燥升华过程数学模型传热传质机理

提出冷冻干燥升华过程主要由传热控制和传质过程两阶段组成，分析认为升华过程是传热传质的逆过程，并得出该过程的合理工艺条件，即物料表面的加热温度和干燥箱内真空度的变化规律。     

浅议影响电化教育效果的主要原因

本文简要论述了影响电化教育效果的几个主要原因，以引起学校有关部门和教育工作者的高度重视，进而采取有效的改进措施，努力提高电化教育效果．     

混合Euler图的特征性质

本文对任意混合图M建立相伴运输网络N_M的概念,并以此给出M是混合Euler图的充要条件。这结果与文献中同类结果相比,具有更大的实用性。     

铁路行包运输交付系统初始化设计

铁路行包运输交付系统初始化子系统由路径表初始化,系统标题表初始化,操作行李员表初始化,初始参数设定和计算参数设定等模块构成.铁路行包运输交付系统的初始化设计,主要解决系统在铁路各等级车站使用中作业流程、业务管理的差异问题.本文讨论了该系统中初始化模块的设计思想与实现手段.     

在各向异性介质中电势的多极矩展开

给出在线性各向异性介质中电势的多极矩展开,及其特点和应用实例。     

Two-way road network design problem with variable lanes

This paper studies a new form of transportation network design problem. In urban transportation network, unreasonable phenomenon can occur in certain traffic period （e.g. on/off duty period）, which demonstrates that the flows of opposite directions on a two-way road are seriously asymmetric; one traffic link of a two-way road congest heavily but the other is hardly used. In order to reduce transportation congestion and make full use of the existing road resources, we propose a lane reallocating approach in peak period, and establish a discrete hi-level programming model for the decision-making. Then, based on particle swarm optimization （PSO） technique, a heuristic solution algorithm for the hi-level model is designed. Finally, the lane reallocating approach is demonstrated through a simple transportation network.     

重介系统脱介效果分析

主要论述了西曲矿选煤厂重介系统流程的现状及存在的问题，重点对脱介筛脱介效果进行了分析，为降低成本(系统的介质消耗)，提高脱介筛的脱介效果提供了可靠的依据。     

2005年输水对官厅水库水质的影响、分析及对策

近几年官厅水库上游降雨量下降,使得官厅水库上游来水逐年减少,蓄水量达到了历史最低点,根据21世纪初期首都水资源可持续利用协调小组统一安排,水利部2003年起部署上游部分水库向官厅水库集中输水。2005年10月17日山西册田水库、河北壶流河水库和友谊水库对北京市官厅水库集中输水0.99亿m3,以缓解本市水资源紧缺的情况,在对现官厅水库水质和此次输水水质的综合评价的基础上,综合分析评价今年集中输水对官厅水库水质的影响,并提出比较合理可行的建议和对策,为输水后官厅水库水质的治理及以后的输水工作提供借鉴和依据。