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确定油井生产时间新方法
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作者 王建君 熊钰 +1 位作者 伍桂花 殷先平 《断块油气田》 CAS 2008年第3期68-70,共3页
根据油藏物质平衡方程式,利用微积分思想,将油井变产量生产时间,转化为容易计算的、稳产方式下的油井生产时间,从而建立油井生产时间模型,并对模型求解,得到生产时间与压力的函数关系。应用该油井生产时间模型,计算江汉油田某一油藏的... 根据油藏物质平衡方程式,利用微积分思想,将油井变产量生产时间,转化为容易计算的、稳产方式下的油井生产时间,从而建立油井生产时间模型,并对模型求解,得到生产时间与压力的函数关系。应用该油井生产时间模型,计算江汉油田某一油藏的生产时间,其结果表明与实际生产时间误差很小,预测精度较高。 展开更多
关键词 油藏物质平衡方程式 微积分思想 油井 生产时间模型
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改进蚁群算法在生产线加工方案选择中的应用 被引量:2
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作者 孔志学 姜恒 张珠峰 《航天制造技术》 2021年第4期17-23,50,共8页
针对多品种小批量数控加工生产线,不同工件、多种工艺路线在同一条生产线上进行混合生产时生产线节拍低、设备利用率低的问题,提出了一种迭代渐进式蚁群算法对生产线最优加工方案进行选择。基于时序优先原则,按工艺路线串行、设备资源... 针对多品种小批量数控加工生产线,不同工件、多种工艺路线在同一条生产线上进行混合生产时生产线节拍低、设备利用率低的问题,提出了一种迭代渐进式蚁群算法对生产线最优加工方案进行选择。基于时序优先原则,按工艺路线串行、设备资源使用时间连续的准则,建立生产线时间模型及生产线综合评价指标;改进算法流程,限定初代算法规模,快速遍历所有产品加工路线,再逐步扩大算法规模,根据历代最优解不同工艺路线分布情况,对蚂蚁路径距离值进行更新,采用至今最优蚂蚁信息素叠加扩散策略,促使搜索进程加速向最优解收敛;采用低阈值伪随机算法,提高算法全局搜索能力,避免算法后期陷入局部最优解。在VS2015软件平台上进行算法仿真对比,结果表明,该算法在避免局别最优和算法收敛速度方面具有明显优势。 展开更多
关键词 生产线时间模型 迭代渐进式蚁群算法 时间线排序 工艺路线
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Total Spending Equation of St. Louis Model: A Causality Analysis for Turkish Economy
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作者 Mert Topcu Ayhan Kuloglu 《Chinese Business Review》 2012年第4期368-376,共9页
Andersen and Jordan (1968) aimed to measure efficiency of monetary and fiscal actions on real GDP by employing a time-series model which was called as St. Louis Model afterwards. Although the model is performed in m... Andersen and Jordan (1968) aimed to measure efficiency of monetary and fiscal actions on real GDP by employing a time-series model which was called as St. Louis Model afterwards. Although the model is performed in many countries similarly, the results differ from each other in accordance with the economic structure of relevant country In this regard, the aim of this paper is to investigate the effectiveness of monetary and fiscal policies on real activity and to find out causal relationship among questioned variables using OLS and causality methodologies in Turkish economy over the period 1998:1-2010: IV. Empirical findings indicate that only monetary policy has a significant positive effect on economic activity in the short run, Nonetheless, neither monetary nor fiscal policy has significant impact on real output in the long run. Causality analysis shows that there exists a unidirectional causality running from real output and money stock to government expenditures. Moreover, not surprisingly, it is also found that crisis experiences of Turkey in sample period have highly adverse impact on real activity. Causality analysis suggests us considering government expenditures as explained variable instead of real output. Hence, it can be concluded that St. Louis Model total spending equation is not applicable for Turkish economy during 1998-2010 periods 展开更多
关键词 St. Louis model monetary policy fiscal policy Turkish economy causality
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