连锁中心店存贮决策模拟系统研究

针对连锁店中心在约束条件下，如何确定各种商品合理存货水平的问题，本文在建立动态规划模型并求解的基础上，利用计算机对市场需求量的仿真，计算选择连锁中心店存贮量最佳决策方案。     

Ghost length, cone length and complete level of DG modules

In this paper, we introduce a new numerical invariant complete level for a DG module over a local chain DG algebra and give a characterization of it in terms of ghost length. We also study some of its upper bounds. The cone length of a DG module is an invariaut closely related with the invariant level. We discover some important results on it.     

An LCOR model for suppressing cascading failure in weighted complex networks

Based on the relationship between capacity and load, cascading failure on weighted complex networks is investigated, and a load-capacity optimal relationship (LCOR) model is proposed in this paper. Compared with three other kinds of load-capacity linear or non-linear relationship models in model networks as well as a number of real-world weighted networks including the railway network, the airports network and the metro network, the LCOR model is shown to have the best robustness against cascading failure with less cost. Furthermore, theoretical analysis and computational method of its cost threshold are provided to validate the effectiveness of the LCOR model. The results show that the LCOR model is effective for designing real-world networks with high robustness and less cost against cascading failure.     

Quantum phase transitions in matrix product states of one-dimensional spin-1/2 chains

For the matrix product system of a one-dimensional spin-1/2 chain, we present a new model of quantum2 phase transitions and find that in the thermodynamic limit, both sides of the critical point are respectively described by phases ｜Ψa 〉=｜1··· 1 representing all particles spin up and ｜Ψb 〉=｜0··· 0 representing all particles spin down, while the phase transition point is an isolated intermediate-coupling point where√ the two phases coexist equally, which is2 described by the so-called N-qubit maximally entangled GHZ state ｜Ψpt =√2/2（｜1··· 1 ＋｜0··· 0）. At the critical point,2the physical quantities including the entanglement are not discontinuous and the matrix product system has longrange correlation and N-qubit maximal entanglement. We believe that our work is helpful for having a comprehensive understanding of quantum phase transitions in matrix product states of one-dimensional spin chains and of potential directive significance to the preparation and control of one-dimensional spin lattice models with stable coherence and N-qubit maximal entanglement.     

用广义特征矩阵计算若当链

In this paper, we introduce a method to define generalized characteristic matrices of a defective matrix by the common form of Jordan chains. The generalized characteristic matrices can be obtained by solving a system of linear equations and they can be used to compute Jordan basis.     

利用分子标记连锁图谱进行水稻数量基因的区间作图

以籼稻窄叶青8号(ZYQ)和粳稻京系17(JX)所衍生的F_2为材料,建立了由54个RFLP标记组成的连锁框架图。采用以侧连标记为基础的QTL区间作图法定位了影响水稻数量性状的11个QTL,它们涉及抽穗期(Dth1)、分蘖角(Ta1),每穗颖花数(Sn1、Sn2、Sn3)和颖花密度(Sdn1—Sdn6)。研究不仅为利用分子标记进行QTL作图提供了范例,同时也证实了QTL区间作图法可以发现位于两个侧连标记之间的QTL;在同一染色体上可存在影响同一数量性状的多个QTL;同类(或相关)性状在遗传上可能由同一类QTL(或多基因系统)所控制。     

湖北省历史时期旱涝灾害的特点与规律分析

通过分析大量的历史文献材料，总结了湖北省水旱灾害的发生具有严重性、区域性、季节性、持续性、连锁性、周期性和人为性的特点．分析了水旱灾害的发生时间变化规律和区域差异，特别是严重水旱灾害的时空变化规律，认为湖北省大旱与大涝常以交替的形式出现，其中水灾明显多于旱灾，同时水旱灾害发生的次数有不断增加的趋势，20世纪以来湖北省已进入大旱、大涝的集中多发期．     

小麦染色体第六部分同源群RFLP连锁图绘制

33个DNA探针用于构建小麦染色体第六部分同源群连锁图。绘制连锁图的资料来自杂交组合中国春(CS)X Synthetic的120个单株的DNA。82个位点被绘制在连锁图上,其中28个在染色体6A上,28个在染色体6B上,26个在染色体6D上。染色体6A,6B,6D的遗传图谱长度分别为73.8cM,91.2cM和117.9cM。有6个功能基因的12个位点被绘制在该图谱中。其中包括编码麦醇溶蛋白的基因Gli-2,α-淀粉酶基因α-Amy-1,核糖体rRNA基因Nor-2,羧肽酶基因Cxp3,亮氨酸拉链蛋白基因Embp,以及一个由受脱落酸诱导而表达的基因Psr899。研究发现染色体6B短臂末端缺失。证明了小麦进化过程中曾发生过6BS/2BS的简单易位。在染色体6B的连锁图上,着丝点附近的遗传位点密度甚高。比较染色体的物理图谱与遗传图谱,发现这种现象主要是由于染色体中部的重组率远低于两端的重组率所致。     

基于电子邮件的连锁商业MIS的研究与实现

通过远程联网实现统一的进销存管理是连锁商业MIS系统的关键。文章阐述了基于电子邮件的一种连锁商业MIS联网的解决方法和相关的数据格式。实践表明本方法具备经济实用、操作维护方便等优点     

粉尘爆炸

本文主要讨论粉尘爆炸机理及其防范