Radio channel assignment

0　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｐｒｏｂｌｅｍｗａｓｐｒｏｐｏｓｅｄｉｎ 2 0 0 0ＭａｔｈｅｍａｔｉｃａｌＣｏｎｔｅｓｔｉｎＭｏｄｅｌｉｎｇ (ＭＣＭ )ｐｒｏｂｌｅｍＢ .Ｂａｓｅｄｏｎｔｈｅｓｔｕｄｙｏｆ 4ｃｏｌｏｒｐｒｏｂｌｅｍ ,ｄｉｆｆｅｒｅｎｔｍｏｄｅｌｓｗｅｒｅｄｅｓｉｇｎｅｄ .1　ＴＨＥＡＳＳＩＧＮＭＥＮＴＭＯＤＥＬＥｖｅｒｙｔｒａｎｓｍｉｔｔｅｒ ,ｌｏｃａｔｅｄａｔｔｈｅｃｅｎｔｅｒｏｆｅａｃｈｈｅｘａｇｏｎｗｈｏｓｅｌｅｎｇｔｈｉｓｓｏｖｅｒａｌａｒｇｅｐｌａｎａｒ ,ｉｓａｓｓｉｇｎｅ…     

基于遗传算法的双区型仓库人工拣货路径优化

为获取捡货作业的最优路径,本文以某配送中心双区型仓库中人工拣货作业为研究对象,探讨了订单批量处理和拣货路径优化问题,建立了拣货车容量受限的TSP模型,并基于遗传算法,设计一种启发式算法对拣货路径进行优化处理,同时,应用Visual 6.0C++程序进行仿真实验,以快速获得任意订单中所有待拣货物的拣取顺序,计算出最短路程。仿真结果表明,将考虑拣货车容量限制的情况下求得的最优路径与未考虑拣货车容量限制的情况下求得的最优路径进行对比,结果拣货的先后次序完全不同,说明考虑运载量是有效的,且更符合实际情况。该研究不但提高拣货效率,而且节约各项成本,对现实仓库的拣货作业具有实际应用价值。     

三种缺陷态光子晶体的比较研究

利用光学传输矩阵法对3种基于均匀结构光子晶体的一维缺陷态光子晶体进行了比较研究.研究发现,对于每种结构,当缺陷介质层厚度变大时,缺陷模中心波长向长波区移动,且缺陷模式的带宽随之增加,当缺陷层介质厚度增加到一定数值时会出现多个缺陷模.对于缺陷层两侧为高折射率介质层的结构一和结构三,缺陷模波长与缺陷层厚度呈非线性比例增加关系;对于缺陷层两侧为低折射率介质层的结构二,缺陷模波长与缺陷层厚度呈线性比例增加关系.对于结构一和结构三,在特定的中间缺陷层厚度时光子禁带区内的缺陷模会消失,而对于结构二,禁带区域内始终存在缺陷模式.     

生物柴油及其原料中水分含量的测定

通过比较卡尔费休法和烘箱法认为卡尔费休法和烘箱法都适合于植物油中水分含量的测定,而卡尔费休法适合于生物柴油中水分含量的测定。     

聚酰亚胺的制备及其性能表征

以均苯四酸二酐(PMDA)为二酐单体,对苯二胺(PDA)为二胺单体,通过低温缩聚合成一系列聚酰胺酸(PAA)和聚酰亚胺(PI)薄膜,对其结构和力学性能进行表征。结果表明,聚酰胺酸的酰亚胺化较完全,PMDA-PDA聚酰亚胺薄膜的拉伸强度达到290 MPa。     

INVESTIGATION ON SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS OF TiAl INTERMETALLIC COMPOUND

The self-propagating high-temperature syn-thesis method was used to synthesize the TiAl intermetalliccompound,and two kinds of synthesis modes were studied inthis paper.The results show that the thermal explosion modeis suitable for the synthesis of TiAI,the pre-heating tempera-ture has a great influence on the synthesis.Microstructurestudy show that the density of the sample fabricated by thermal explosion mode is higher than that fabricated by propa-gating mode.     

STUDY ON STRUCTURE AND PROPERTY OF Nb-DOPED TiC CERAMIC WITH QUANTUM CHEMISTRY CALCULATIONS

Nb-doped TiC ceramic,or (Nb_yTi_(1-y)) C_x, inwhich amount of Nb element added is increased from zero to40Wt.%, synthisized with self propagating high temperaturesynthesis, is studicd with SCF-Xa-DV,a quantum chemistry cal-culating method. The chemical bonding is studied to discuss therelation between structrues and properties. Several classes ofmodels in which there is no vacancy,one vacancy or two vacan-cies have been calculated. From the calculated results of bond or-der, a measure of covalent bond strength, and molecule orbitalcontotr map, it is concluded that when Nb element added in-creases, the vacancies increase correspondinigly, the covalent com-ponent of chemical bonds of the samples decreases while the met-al-bonding component increases, so the hardness and resistanceof the samples decrease.     

Computational Comminution and Its Key Technologies Applied to Materials Processing Procedure

A new concept named computational comminution is proposed in this paper, which is different from the traditional studies on materials processing procedure such as the study based on theoretic models, the study based on experiment models, which is based on information models . Some key technologies applied to materials processing procedure such as artificial neural networks, fuzzy sets, genetic algorithms and visualization technology are also presented, and a fusing methodology of these new technologies is studied. Application in the cement grinding process of Horomill shows that results in this paper are efficient.     

用moire技术测量平板玻璃折射率

本文描述了使用moire技术测量平板玻璃折射率的理论并进行了实验论证。测量方法简单且快捷。可精确测量任何透明材料的折射率。测量精确度可达10~(-5)。     

土木工程国家级特色专业建设探索与实践

文章分析了土木工程国家级特色专业建设的现状及成果,结合山东建筑大学土木工程国家级特色专业建设,以培养学生的创新和实践能力为核心,就人才培养模式、课程体系建设与教学改革、实践教学改革、师资队伍建设、社会服务及文化传承等方面进行了比较深入的研究,总结了我校在土木工程国家级特色专业建设的成果,探讨了专业进一步发展的思路.