RFG—DMR降烯烃催化剂在重油催化裂化装置上的工业应用

介绍了东明石化集团Ⅱ套重油催化裂化装置使用RFG—DMR降烯烃催化剂的情况。该催化剂占系统藏量83％时进行的标定结果表明：该剂降低汽油烯烃含量效果比较明显。汽油烯烃体积分数由48．56％降到39．72％．下降了8．84％。汽油辛烷值没有降低。产品分布得到改善。重油裂化能力强。于气和焦炭选择性好。轻质油收率增加了1．07％，总液体收率增加了1．56％。     

一种德州扑克的牌力评估方法

德州扑克是机器博弈领域中一种很好的研究对象,与国际象棋、西洋棋等不同,其涉及了诸如不完整信息抽象与处理、多智能体竞争、风险评估与管理、对手建模等多方面的问题研究。其中,不完备信息抽象与处理是其他问题研究的基础,抽象与处理信息就是要对当前牌局进行评估以供后续工作使用。针对牌局信息不完整的情况,讨论了一些评估牌力方法,分析了这些方法的利弊,并提出了一种新的牌力评估方法,以提升计算速度,减少资源占用。实验结果表明,新的方法摒弃了查找表,达到了节省空间的目的,同时也具备较快的计算速度。     

A reactive GRASP and path relinking for a combined production–distribution problem

An NP-hard production–distribution problem for one product over a multi-period horizon is investigated. The aim is to minimize total cost taking production setups, inventory levels and distribution into account. An integer linear model is proposed as a compact problem specification but it cannot be solved to optimality for large instances. Instead of using a classical two-phase approach (production planning and then route construction for each day), metaheuristics that simultaneously tackle production and routing decisions are developed: a GRASP (greedy randomized adaptive search procedure) and two improved versions using either a reactive mechanism or a path-relinking process. These algorithms are evaluated on 90 randomly generated instances with 50, 100 and 200 customers and 20 periods. The results confirm the interest of integrating production and distribution decisions, compared to classical two-phase methods. Moreover, reaction and path-relinking give better results than the GRASP alone.     

基于学习自动化的混杂电力系统紧急频率控制

分析了电力系统的混杂特性;介绍了学习自动化机这一建模的工具;提出了一种基于学习自动化机的电力系统混杂控制的结构模型,并把这一模型用于电力系统紧急频率控制中;研究了学习自动机的巩固再励方案,得到了相应的控制算法;最后,举全说明所提出的关于混杂电力系统紧急频率控制模型及策略和算法的可行性和有效性。     

Dynamic Changes in Reactive Oxygen Species in the Shoot Apex Contribute to Stem Cell Death in Arabidopsis thaliana

In monocarpic plants, stem cells are fated to die. However, the potential mechanism of stem cell death has remained elusive. Here, we reveal that the levels of two forms of reactive oxygen species (ROS), superoxide anion free radical (O2·−) and hydrogen peroxide (H₂O₂), show dynamic changes in the shoot apex during the plant life cycle of Arabidopsis thaliana. We found that the level of O2·− decreased and disappeared at four weeks after bolting (WAB), while H₂O₂ appeared at 3 WAB and showed a burst at 5 WAB. The timing of dynamic changes in O2·− and H₂O₂ was delayed for approximately three weeks in clv3-2, which has a longer lifespan. Moreover, exogenous application of H₂O₂ inhibited the expression of the stem cell determinant WUSCHEL (WUS) and promoted the expression of the developmentally programmed cell death (dPCD) marker gene ORESARA 1 (ORE1). These results indicate that H₂O₂ triggers an important signal inducing dPCD in stem cells. Given that O2·− plays roles in maintaining WUS expression and stem cell activity, we speculate that the dynamic shift from O2·− to H₂O₂ in the shoot apex results in stem cell death. Our findings provide novel insights for understanding ROS-mediated regulation during plant stem cell death.     

国外干粉灭火系统引进使用情况调查

介绍了几套从国外引进的干粉灭火系统的组成、主要技术指标、控制方式及使用、运行情况，并就各自特点进行了分析，可供我国消防产品开发、工程设计和管理人员参考借鉴。     

DISOPE distributed model predictive control of cascade systems with network communication

A novel distributed model predictive control scheme based on dynamic integrated system optimization and parameter estimation (DISOPE) was proposed for nonlinear cascade systems under net work environment.Under the distributed control structure ,online optimization of the cascade system was composed of several cascaded agents that can cooperate and exchange information via network communication.By iterating on modified distributed lin ear optimal control problems on the basis of est imating parameters at every iteration the correct op timal control action of the nonlinear model predicti ve control problem of the cascade system could b e obtained,assuming that the algorithm was convergen t.This approach avoids solving the complex nonlinear optimi zation problem and significantly reduces the computation al burden.The simulation results of the fossil f uel power unit are illustrated to verify the eff ectiveness and practicability of the proposed algorithm.     

On the conjunction practical stability and controllability of large-scale impulsive control systems

We studied the conjunction practical stability and controllability of large-scale impulsive control systems by using the comparison systems and vector Lyapunov functions. Then the less conservative sufficient conditions fo r conjunction practical stability and controllability of large-scale impulsive control system were obtained.     

用小直径空心纤维薄膜分流过滤葡萄酒

介绍了当今世界上葡萄酒生产过程中,对过滤工序的要求。采用小直径空心纤维薄膜的分流过滤法具有很多优点,在德国占据了很大的市场份额,将在欧洲市场上快速发展起来,具有光明的前景。     

论管理机制与创新

一个组织的管理效果在很大程度上取决于管理机制的好坏。因此，管理机制便成为了一个重要的研究课题。笔者就这一研究课题作些探讨，以供讨论参考。