一种应用于柔性作业车间成组调度问题的分级优化算法

提出一种求解柔性作业车间成组调度FGJSS(flexible grouped job-shop scheduling)问题的蚁群粒子群求解算法。算法采用主从递阶形式,主级为蚁群优化算法,选择零件加工设备;从级为粒子群优化算法,在主级零件加工设备约束下优化设备作业排序以实现流通时间最小的目标。算法中,以工序加工时间和设备承载的作业族数为启发式信息设计蚂蚁在工序可用设备间转移概率;以粒子向量优先权值和作业族号为依据设计解码方法实现设备上的成组作业排序。最后,通过仿真实验,验证了该算法的有效性。     

Intergrain Interaction, Coercivity and Henkel Plot for NdFeB Magnets

For both sintered and nanocomposite NdFeB magnets, deltaM(H) of the Henkel plot increases from zero, and reaches a peak, then decreases and changes to the negative values with increasing applied field. This shows that the intergrain interaction changes from the exchange-coup ling type into the magnetostatic interaction type. The magnetic field corresponding to the peak of deltaM(H) is slightly smaller than the coercivity of magnet. The peak of deltaM(H) for aligned sintered magnet is greater than that for misaligned magnet. deltaM(H) peak of the nanocomposite NdFeB magnets increases with decreasing grain sizes. It indicates that the effect of alignment field on the properties of magnet is similar to that of exchange-coupling interaction.     

疏松砂岩油藏油层保护评价新方法研究

有效选取代表储集层特性的圆柱状岩心是利用岩心流动实验进行油气层损害机理研究的前提。胶结强度较弱的疏松砂岩油藏采用常规方法难以获得成形岩心,给油气层保护技术研究造成很大困难。研制了一种岩心封固套,可用以将储集层松散油砂制备成不同孔隙度和渗透率实验岩心。该方法不需加入胶结剂粘结和高温烧结岩心,避免了岩性变化和表面润湿性转变,能较真实地反映储集层的岩性和物性,可直接用于岩心流动实验评价。用G104-5区块松散油砂制备的实验岩心,其岩心流动实验敏感性评价结果与前期研究结果完全一致,表明利用新研制的岩心封固套制备实验岩心进行油气层损害机理评价实验研究是切实可行的。该方法简便、快捷、经济,对今后开展疏松砂岩油层保护评价研究具有一定的实用价值。图2表3参3（王富华摘）     

具有角色转换的自适应人工蜂群算法

提出一种具有引领蜂与跟随蜂动态协调机制的改进人工蜂群算法（DHABC）。根据优化函数的寻优状态,设计了引领蜂与跟随蜂动态角色转换机制,以更好地适应全局和局部搜索;为使算法能够更好地进行局部兼顾更大范围搜索,设计了引领蜂与跟随蜂间位置信息的共享方式;为提高算法的求解速度,设计了跟随蜂进化代数起始值的计算方法;通过仿真和比较实验,改进算法较其他ABC改进算法及其他智能优化算法既参数少,便于应用,又求解精度较高。     

3种相分布模型中纳米复合永磁体矫顽力与晶粒尺寸的关系

建立了3种物理模型,研究了纳米复合永磁材料中晶粒尺寸、两相分布及体积分数与矫顽力间的变化关系.计算结果表明:不同的两相分布导致晶粒接触界面分数变化,从而引起晶间交换耦合作用的涨落;相分布影响纳米复合永磁体矫顽力的大小,但没有改变其随晶粒尺寸变化的关系;设计理想的相分布并且适当控制晶粒尺寸.是实现纳米复合永磁材料高矫顽力的可能途径.     

川南硫铁矿开发中的环境污染与治理

硫铁矿是川南地区一种丰富的矿产资源 ,曾为当地经济发展作出过巨大贡献 ,同时也给当地环境带来了严重污染 ,为了保护环境 ,不得不将其关闭。然而 ,只需通过不太多的经费投入 ,进行并不十分复杂的技术改造 ,就可达到提高生产效益 ,综合利用资源 ,治理环境污染的目的 ,实现发展经济 ,保护环境 ,走可持续发展之路     

硫磺回收烟气超低排放工艺技术比较

常规硫磺回收装置采用了二级Claus+加氢还原吸收焚烧工艺,烟气中SO2浓度很难达到GB 31570—2015《石油炼制工业污染物排放标准》规定的特别排放限值100 mg/m3。目前,能满足硫磺回收烟气中SO2浓度≯100 mg/m3的烟气净化工艺有钠法脱硫工艺、氨法脱硫工艺、SO2回收工艺。通过在工程投资、生产成本、能耗、操作风险、操作难度等方面对3种工艺进行比较,得出不同工艺的优缺点。     

Fragmentation handling for visual tracking

Object detection and tracking using background subtraction suffers from the fragmentation problem which means one object fragments into several blobs because of being similar with the reference image in color. In this paper, we build a visual tracking framework using background subtraction for object detection, and we address the association difficulty of blobs with objects caused by the fragmentation problem by two steps. We firstly cluster the blobs according to the boundary distances of them estimated by an approximating method proposed in this paper. Blobs clustered into the same blob-set are considered from the same object. Secondly, we consider blob-sets possibly from the same object if they exhibit coherent motion, since blobs of the same object may be clustered into different blob-sets if the object fragments severely. A background-matching method is proposed to determine whether two blob-sets exhibiting coherent motion are truly from the same object or from different objects. We test the proposed methods on several real-world video sequences. Quantitative and qualitative experimental results show that the proposed methods handle the problems caused by fragmentation effectively.     

超长镀锌弧形波形瓦结构的有限元计算

建立了柱壳结构的有限元力学模型,用FORTRAN77语言编制出计算程序,最终对超长镀锌弧形波形瓦结构进行有限元计算,文中分析了超长镀锌弧波形瓦结构的变形与几何参数之关系,得出了许多有益的结果,为超长锌镀弧形波形瓦企业标准的制定及其产品的推广应用提供理论依据和基础数据。     

Distributed adaptive flocking of robotic fish system with a leader of bounded unknown input

A distributed leader-follower flocking problem of multiple robotic fish governed by extended second-order unicycles is studied in this paper. The multi-agent system consists of only one leader with pre-appointed and bounded speeds. A distributed flocking algorithm on the basis of the combination of consensus and attractive/repulsive functions is investigated, in which adaptive strategy is adopted to compute the weight of the velocity coupling strengths. The proposed control algorithm enables followers to asymptotically track the leader’s varying velocities and approach the equilibrium distances with their neighbors. Furthermore, the arbitrarily-shaped formation flocking problem of the system can also be solved by adding the information of a desired formation topology to the potential function term. Finally, simulations are carried out to verify the effectiveness of the proposed theoretical results.