基于电子商务的集群式供应链跨链库存控制

以电子商务环境下集群式供应链库存控制为对象,建立了时变需求下跨链合作的交叉库存模型,并用H∞控制中抑制外部干扰的对策理论来寻求最优订货策略,以减小库存、订货波动和提高供需网快速响应市场的能力.文中采用对比分析方法分别针对供应链间有合作与无合作情形对模型做了仿真实验,仿真表明,实施H∞控制和交叉紧急库存补充策略可以有效避免货物积压或缺货现象,提高供应链及集群的竞争力.     

高能中子消失法的检验

以前在贫化铀／聚乙烯／铁组合球装置上进行的高能中子消失法的检验，存在的问题在于贫化铀内腔太小，距离的微小误差就会对实验结果产生很大影响，实验重复性差。因此用同样是中子增殖材料的铍代替贫化铀作补充实验。这样，一则可以减小因为距离的偏差对实验的影响；二则可能对^197Au(n，γ)、^198Au反应的影响再做研究。用铍／聚乙烯／铁组合球装置，在ns-200加速器上照射，用HPGe探测器测量．Au，Al，Nb高阈能指示剂的活化γ射线，确定它们在装置中的反应燃耗，以此检验高能中子消失法。     

具有第二次多选择服务的M[X]/G/1排队系统

本文研究成批到达的具有第二次多选择服务的单服务员排队系统．顾客的到达形成一广义泊松过程，不同批的顾客按先到先服务的规则，而同一批的顾客按随机次序接受服务．两次服务的服务时间都是一般分布且相互独立．本文采用补充变量法，求得在瞬态和稳态情况下系统队长的概率母函数，然后又计算出顾客的平均队长和平均等待时间．     

警惕锌剂治疗的毒性和副作用

临床实践证明某些疾病补锌治疗有效，但也发现1％左右的人出现副作用，人类对锌过量虽具有耐受性，但据报道不管是急性中毒量，治疗量，还是常用的自选补充量，均可出现中毒症状。原因是锌与其它元素间有相互作用，特别是与铜的拮抗作用，所以用锌剂一定要严格掌握适应症、剂量、疗程，以免引起不良反应，影响儿童健康。     

生物质热化学转化制备生物燃料及化学品

生物质是环境友好的可再生能源.近年来相关研究不断升温,文献报道量激增.本文在现有文献综述及近期报道的基础上,从利用热化学方法由生物质获得燃料油及化学品的角度对各方案进行了归纳、适当补充及简要述评,重点介绍了生物油催化裂解精制、水相重整制备烷烃、超临界水/水热制备化学品3个领域.     

2005年第六届中国（广州）国际分析测试／生物技术交流会特邀报告预通知

文献[1]作者将待测水样在水浴上蒸干和在电炉上加热蒸干进行对比试验，建议用电炉蒸干法测定水中硝酸盐氮。本文在此基础上，结合多年的实践，作出补充。     

具有使用及维修优先权的三部件冷贮备系统的几何模型

研究了两个不同型部件串联带有一个冷贮备部件的可修型冷贮备系统.假定三个部件的工作时间和维修时间均服从指数分布,对部件2的修理是几何维修而对部件1和3的修理则是修复如新,且部件2比部件3有优先使用权和优先维修权.在这些假设下,运用补充变量法与几何过程理论,得出了系统可靠度,首次故障前平均时间,可用度,瞬时故障频度和修理工空闲的概率等可靠性指标.     

氧化数教学争议的化解

Starting with the definition of oxidation number and the development of its concept, the controversial issues in the teaching of oxidation number were discussed in this paper, and the rule that the positive oxidation number of the element should be less than or equal to the total numbers of valence electrons of the atom was put forward to determine the oxidation number. Additionally, the calculation of oxidation number in the compounds with complex structure and unknown structure has been resolved.     

MARKOV SKELETON PROCESS IN PERT NETWORKS

In this article, we investigate Programming Evaluation and Review Technique networks with independently and generally distributed activity durations. For any path in this network, we select all the activities related to this path such that the completion time of the sub-network （only consisting of all the related activities） is equal to the completion time of this path. We use the elapsed time as the supplementary variables and model this sub-network as a Markov skeleton process, the state space is related to the subnetwork structure. Then use the backward equation to compute the distribution of the sub-network＇s completion time, which is an important rule in project management and scheduling.     

The dynamics of triple-well trapped Bose-Einstein condensates with atoms feeding and loss effects

In this paper, we consider the macroscopic quantum tunnelling and self-trapping phenomena of Bose-Einstein condensates （BECs） with three-body recombination losses and atoms feeding from thermal cloud in triple-well potential. Using the three-mode approximation, three coupled Gross-Pitaevskii equations （GPEs）, which describe the dynamics of the system, are obtained. The corresponding numerical results reveal some interesting characteristics of BECs for different scattering lengths. The self-trapping and quantum tunnelling both are found in zero-phase and ：r-phase modes. Furthermore, we observe the quantum beating phenomenon and the resonance character during the self-trapping and quantum tunnelling. It is also shown that the initial phase has a significant effect on the dynamics of the system.