石油企业推行物资供应配送制的探讨

石油企业目前普遍采用传统的领料制物资供应模式，物资供应流转环节多、效率低、成本高，已经越来越制约着企业的生产和发展。分析了传统物资供应模式所存在的弊端，阐述了石油企业开展物资配送制的有利条件，提出了开展物资配送制的具体思路，并对实施配送制过程中需要注意的问题进行了探讨。     

近代中国人造丝及其制品的进出口贸易

本文首先简述了人造丝进口贸易情况,分析了人造丝的进口国别和到达港口的变化。然后分别论述了人造丝织品和人造丝交织品的进、出口贸易的发展,分析了进出口额变化的原因。文中给出了人造丝及其制品进出口的一些资料。     

应用先进设备和手段控制散堆装货物超载

分析了铁路运输中货车超载的原因，提出了防止散堆装货物超载的对策，特别探讨了应用先进设备和手段控制散堆装货物超载的做法。     

中日韩三国创意产品和创意服务贸易国际竞争力比较研究

文章针对创意产品和创意服务贸易展开研究,对中日韩三国创意产品和创意服务贸易现状及其竞争优势进行分析后,分别从国际市场占有率、TCA指数、RCA指数的角度对三国的创意产品和创意服务贸易国际竞争力进行了实证和比较分析,发现我国创意产品贸易竞争力明显强于日韩,而三国在创意服务贸易领域内的竞争力不相上下,最后提出强化我国创意产品和创意服务贸易国际竞争力的相应策略.     

Cooperation in an asymmetric volunteer’s dilemma game with relatedness

What motivates some members of a social group to voluntarily incur costs in order to provide for the common good? This question lies at the heart of theoretical and empirical studies of cooperative behavior. This is also the question that underlies the classic volunteer’s dilemma model, which has been previously explored in scenarios where group members are related or interact asym- metrically. Here we present a model that combines asymmetry and relatedness, showing that the probability of volunteerism in such systems depends closely on both the degree of asymmetry and level of relatedness between interacting individuals. As has been shown in previous volunteer’s dilemma models, the payoff ratio and overall group size also influence the probability of volunteerism. The probability of volunteerism decreases with increasing group size or decreasing cost-to-benefit ratio of the coplayers; in the presence of asymmetrical interactions, subordinate players were more likely to offer public goods than the dominant player. More asymmetrical interactions decrease the probability of volunteerism of the dominant player; overall volunteerism increases with increasing relatedness.     

基于记忆效应的空间公共物品博弈

【目的】空间公共物品博弈是可重复的,投资者在交易过程中存在学习与模仿现象,参与者学习对方策略时首先考查其随时间累积的历史收益情况。由于记忆的有限性,他们只能记忆离现在最近有限时步内的收益情况,并不断更新记忆库。【方法】通过计算机模拟,发现记忆效应可以促进合作行为的出现。【结果】当收益累积长度达到一定值时,系统的合作水平维持在某一稳定水平。【结论】本研究结果对金融系统中投资者的投资行为有积极的指导意义,可以解决现实社会中投资者的盲从性。     

延迟产品分化的离散时间排队模型

研究了一个延迟产品分化的生产系统,供应商在MTS系统的基础上为制造商提供半成品,当收到客户订单时,制造商再在MTO系统的基础上通过定制半成品来满足客户的需求.供应商生产半成品所花费的时间占总生产时间的比例将决定半成品适应客户需求的程度,制造商希望决定最佳的产品分化点和半成品缓冲区大小.利用拟生灭过程和矩阵几何解得到这个系统的性能指标,并且给出优化策略,通过系统仿真得到优化结果.     

特殊螺纹接头油井管的设计和选用

介绍了API螺纹油井管的特点及存在的问题,结合我国在开发、应用特殊螺纹接头油井管过程中取得的经验,从不同的使用服役条件综合分析评述西姆莱斯开发的各种特殊螺纹结构设计与选用要点,并指出存在的问题,探讨进一步的研究开发方向,为有针对性地选好、用好特殊扣油井管产品提供参考.     

钢针起毛机工作原理及工艺探讨

本文通过钢针起毛机作用原理的分析,对影响起毛作用的因素和工艺进行了探讨,对进一步熟悉起毛机的性能和起毛工艺调整有指导意义。在一定程度上有益于产品质量的提高。     

Long-term forecasting with innovation diffusion models: The impact of replacement purchases

The model presented in this paper integrates two distinct components of the demand for durable goods: adoptions and replacements. The adoption of a new product is modeled as an innovation diffusion process, using price and population as exogenous variables. Adopters are expected to eventually replace their old units of the product, with a probability which depends on the age of the owned unit, and other random factors such as overload, style-changes etc. It is shovn that the integration of adoption and replacement demand components in our model yields quality sales forecasts, not only under conditions where detailed data on replacement sales is available, but also when the forecaster's access is limited to total sales data and educated guesses on certain elements of the replacement process.