网格计算的应用与发展

网格计算是近年来兴起的一个研究热点.在介绍网格计算的基本概念、特点、体系结构及其关键技术的基础上,结合网格计算在国内外的应用,探讨了网格计算需要解决的一些问题,并对网格计算的发展前景作了展望.     

Bocs的一些几何性质(Ⅱ)

对任意固定的维数向量Ｚ，定义了三角层化ｂｏｃｓ的表示ＲＺ（Ａ）和ｉｎｄＺ（Ａ）的参数数Ｕ（Ｚ）和Ｐ（Ｚ），并用它们刻画了三角层化ｂｏｃｓ的表示型。     

基于神经网络的生产作业计划应用研究

研究利用前向神经网络 (也称多层感知机 )安排单件小批量订单生产类型企业的生产作业计划 ,针对数据难于组织、反传算法易陷入局部极小点和输出结果存在偏差的问题 ,提出了以下的解决方法 :基于位混合编码的样本组织方式 ;权值和迁跃点记忆队列的网络训练方法和结果校正方法 .仿真结果证明了解决方法的有效性和基于神经网络研究生产作业计划的可行性 .     

Synthesis and electrochemical characteristics of xLi2MnO3·(1−x)Li-(Ni1/3Co1/3Mn1/3)O2 compounds

xLi₂MnO₃·(1−x)Li(Ni_1/3Co_1/3Mn_1/3)O₂ (x=0.25, 0.40, 0.55) compounds were prepared by low-heating solid state reaction. In the voltage range of 2.70-4.35 V, the discharge capacity of the electrode decreased with the increase of x, with a better cyclability. However, when cycled between 2.7 and 4.6 V, the cathodes delivered much larger capacities and their capacities increased with the introduction of Li₂MnO₃. Moreover, it was found that the discharge capacity gradually increased with the cycle number. The reason for this phenomenon was discussed. It was found that the relatively low cut-off potential made the activation of the Li₂MnO₃ component in the compound a gradual process, which caused the increasing capacity.     

Recent progress in polymer/layered double hydroxide nanocomposites

New developments in the studies of nanocomposites based on polymer matrixes and layered double hydroxides (LDHs) in recent years are reviewed combining our relative research work, among which the synthesis techniques, the physicochemical characterizations, and the improved material properties are especially discussed. The possible application of polymer/LDH nanocomposites is also proposed.     

Improved BLAST for wireless communications

1.INTRODUCTIONAs an approach to space-ti me coding,bell layeredspace-ti me(BLAST)architecture was first intro-duced by Foschini of Bell Labin1996[1].BLASThasadvantages over other space-ti me coding approachesintwo aspects,namely,high spectrum efficiency andlowcomplexity of encoding and decoding algorithm.BLAST achieves its high spectrum efficiency at thecost of part of its diversity gain.Since it does notmake full use of the diversity provided by multiple an-tennas,its performance i…     

Research on a New Type of Diamond Saw Plate

With the developing of stone material, diamond saw pl ate is used widely, and in order to increase cutting efficiency and life-span o f diamond saw plate, there are a lot of research jobs of segment for diamond saw plate. Layered segment for diamond saw plate is to divide single segment into s everal cutting tools by its structure, then increases rock-cutting faces. For i mpregnated man-made diamond saw plate, the bonding strength of diamonds with ma trix material has great effect on its life and service....     

分层填埋场竖井及水平井联合抽气

采用特征函数展开法求解分层填埋场的二维气体运移模型,考虑了由于压缩、降解和含水量分布不均等引起的产气率和渗透系数成层特性以及垃圾的各向异性,然后结合边界和连续性条件确定其待定参数.最后,基于考虑了气体竖向和水平向运移的解析解,研究了竖井、水平井收集系统和排气层对填埋场内气体压力和回收率的影响,进一步提出了土工膜覆盖下填埋场气体收集系统的设计方法.     

基于GIS 的最短路径算法研究

针对单源最短路径Dijkstra 算法效率低的问题, 基于地理信息系统(GIS: Geographic Information System),提出距离均衡的社区分析网络分割方法。将GIS 中道路网络分割降解为距离均衡的社区网络, 再利用限制分层算法, 通过淘汰不太可能出现在最短路径上的节点, 限制GIS 中最短路径的搜索区域, 以降低算法的复杂度。实验结果表明, 优化后的算法可有效减少搜索节点数, 与经典算法相比, 其运行效率有所提高。     

高职数学分层教学的探索与实践

近年来,高职院校生源不断扩大的同时,入学学生的文化基础知识参差不齐的情况较突出,面对学生知识储备、学习兴趣、学习策略、知识技能等多方面存在的差异,在高职数学教学中探索、实施分层教学是提高高职数学教学质量的有效途径。本文阐述了我们数学教研室近年来在这方面所做的探索与实践。