微波在矿物化学处理中的应用

综述了微波技术取代传统的加热方法应用于化学选矿的研究进展,并对微波加热原理用于硫化矿的浸出体系及难选金矿的预处理的机理进行了讨论.     

离散加工系统反馈控制的代数综合方法

本文研究离散加工系统中异步并发活动的控制与协调问题．系统采用具有外部输入位置的受控标识图描述．通过对外部输入位置中令牌数目的控制，使系统不进入禁止状态集，同时具有最大限度的柔性．系统的逻辑行为用极小代数描述，并由此得到一步允许无冗余控制策略．     

基于最小费用最大流的MANET网络路由能量控制模型

MANET是当前无线网络研究的热点领域,作为网络层核心技术的路由协议显得尤为重要。控制节点能量、提高网络生存时间是实现在MANET中传输高效业务的关键。本文借鉴网络最小费用最大流思想,建立网络最大剩余能量最短路数学模型,提出了基于能量控制的网络路由优化模型。并且定义了网络生存时间作为评价指标,进行网络仿真。仿真结果表明,该模型可以有效地延长网络生存时间。     

Utility max–min fair resource allocation for communication networks with multipath routing

This paper considers the flow control and resource allocation problem as applied to the generic multipath communication networks with heterogeneous applications. We propose a novel distributed algorithm, show and prove that among all the sources with positive increasing and bounded utilities (no need to be concave) in steady state, the utility max–min fairness is achieved, which is essential for balancing Quality of Service (QoS) for different applications. By combining the first order Lagrangian method and filtering mechanism, the adopted approach eliminates typical oscillation behavior in multipath networks and possesses a rapid convergence property. In addition, the algorithm is capable of deciding the optimal routing strategy and distributing the total traffic evenly out of the available paths. The performance of our utility max–min fair flow control algorithm is evaluated through simulations under two representative case studies, as well as the real implementation issues are addressed deliberately for the practical purpose.     

基于极小值跟踪法的水线变换图像分割

提出了一种基于极小值跟踪法的水线变换图像分割方法。针对水线变换中的过分割及水线漂移的问题,该方法用形态闭求得图像的凹谷,对所得的凹谷图像采用极小提升法,以减少凹谷图像中的极小值的个数,然后跟踪极小值在原凹谷图像中的位置,根据标记对原凹谷图像进行测地重建后,采用水线变换进行分割。实验结果表明,该算法可以有效地解决地分割及水线漂移问题,改善分割质量。     

End-to-end maxmin fairness in multihop wireless networks: Theory and protocol

To promote commercial deployment of multihop wireless networks, the research/industry communities must develop new theories and protocols for flexible traffic engineering in these networks in order to support diverse user applications. This paper studies an important traffic engineering problem–how to support fair bandwidth allocation among all end-to-end flows in a multihop wireless network–which, in a more precise term, is to achieve the global maxmin fairness objective in bandwidth allocation. There exists no distributed algorithm for this problem in multihop wireless networks using IEEE 802.11 DCF. We have two major contributions. The first contribution is to develop a novel theory that maps the global maxmin objective to four local conditions and prove their equivalence. The second contribution is to design a distributed rate adjustment protocol based on those local conditions to achieve the global maxmin objective through fully distributed operations. Comparing with the prior art, our protocol has a number of advantages. It is designed for the popular IEEE 802.11 DCF. It replaces per-flow queueing with per-destination queueing. It achieves far better fairness (or weighted fairness) among end-to-end flows.     

用导矢叉乘法对NURBS曲线进行形状调整

提出用新旧曲线上对应点的两个导矢叉乘平方的积分定义目标函数的方法．通过极小化目标函数使新曲线偏离原曲线的程度最小，从而使新曲线在满足修改条件的前提下更符合原曲线所定义的形状．用实例对该方法和其它几种方法构造的曲线的形状及其误差进行了比较．     

多施主掺杂PTC陶瓷材料的研究

本文在双施主掺杂高ＴｃＢａＴｉＯ_３基ＰＴＣ陶瓷材料的基础上,对ＢａＴｉＯ_３的Ａ、Ｂ、Ｏ位同时进行离子置换以实现多施主掺杂,同时还研究了烧结温度对阻温特性的影响。研究结果表明,多施主掺杂试样的烧成温度对ｐ－Ｔ性能影响很大,在一定配方及工艺条件下,获得的ＰＴＣ陶瓷材料的室温电阻率变化不大,升阻比明显提高。     

基于最小沉降速度的浓缩机入料装置改进研究

 本文运用“浅池理论”给出假设条件,推导出浓缩机底流量不可忽略和可忽略两种情况下煤泥颗粒的最小沉降速度公式,并分析煤泥颗粒最小沉降速度的影响因素。在此基础上,对浓缩机入料装置进行改进,改变了入料液流的方式和方向,增加了水平流动层的厚度,稳定了浓缩机入料流态,改善了煤泥颗粒沉降的路线,有效提高了煤泥颗粒沉降速度的稳定性。     

零价铁还原处理卷烟焦油废水

通过改变氯化钠、铁的投加量、溶液pH、反应时间四个因素,用零价铁还原的方法预处理焦油废水。探求去除CODcr,的最佳条件。通过正交试验校正得出最佳反应条件为：氯化钠量为400mg／L,铁粉量为30g／L,pH值为2,搅拌时间为75min。在该条件下CODcr去除率可达48．1％。