离岸集装箱码头新装卸工艺模式下陆域集疏运堆场堆存空间分配     

杨晓斌  余思勤  沈一帆 《上海海事大学学报》2020,41(4):8-14

离岸集装箱码头因其岛屿面积限制，难以通过扩建码头内部堆场增加吞吐能力。为解决这个问题，提出一种离岸集装箱码头新装卸工艺模式。新装卸工艺模式是通过在离岸集装箱码头附近的陆域地带建设陆域集疏运堆场,与离岸集装箱码头进行协同装卸作业的模式。陆域集疏运堆场堆存空间分配的目标是满足离岸集装箱码头装卸作业预翻倒要求;单批次输送集装箱的量受到陆岛运输最大通行能力限制。根据上述目标与特点，构建新装卸工艺模式下陆域集疏运堆场堆存空间分配模型，并设计蒙特卡洛树搜索算法进行求解。通过算例分析验证模型的有效性。结果表明该方法能够满足陆域集疏运堆场堆存空间分配需求并提高离岸集装箱码头的吞吐能力。  相似文献   

Dynamic Monte Carlo simulation of linear SAW polymer chain near a flat surface     

黄建花  韩世钧 《Journal of Zhejiang University. Science. B》2004,(6)

INTRODUCTION The conformational property of polymerchains subject to a geometrical constraint is one of themost interesting topics in polymer science (Milner,1991; Malfreyt and Tildesley, 2000; Vacatello,2001). The geometrical constraint can be a solidsurface, a liquid/liquid interface, a vacuum/liquidinterface, etc. So the topic has many applications intechnology such as adsorption onto interface, sta-bilization of colloids and partition equilibrium ingel permeation chromatography…  相似文献   

Monte Carlo法在含体积缺陷压力管道可靠性分析中的应用     

冯秋芬  段志祥 《湘南学院学报》2006,27(5):35-40

工业生产装置中,压力管道是重要的组成部分.通常压力管道中存在着局部减薄,而且局部减薄尺寸等参数具有物理不确定性和统计不确定性,所以应该用可靠性来定量衡量其安全状况.依据GB/T 19624-2004计算模型进行蒙特卡罗模拟,计算局部减薄管道的可靠性.该计算方法使用方便,结果可靠.  相似文献   

Statistical Power of the Multiple Domain Latent Growth Model for Detecting Group Differences     

Kejin Lee  Tiffany A. Whittaker 《Structural equation modeling》2018,25(5):700-714

The latent growth model (LGM) in structural equation modeling (SEM) may be extended to allow for the modeling of associations among multiple latent growth trajectories, resulting in a multiple domain latent growth model (MDLGM). While the MDLGM is conceived as a more powerful multivariate analysis technique, the examination of its methodological performance is very limited. Hence, the present study compared the power of the MDLGM with that of a set of univariate LGMs for detecting group differences in growth rates over time using a Monte Carlo study with a two-group and two-domain design. The results indicated that there were different scenarios where the power rates for the MDLGM were greater than that of the set of LGMs (and vice versa) due to a joint function of the two domains’ intercorrelation size and the group difference effect size.  相似文献   

Random vibration analysis of switching apparatus based on Monte Carlo method     

ZHAI Guo-fu CHEN Yang-hua REN Wan-bin 《浙江大学学报(A卷英文版)》2007,8(3):422-425

The performance in vibration environment of switching apparatus containing mechanical contact is an important element when judging the apparatus’s reliability. A piecewise linear two-degrees-of-freedom mathematical model considering contact loss was built in this work, and the vibration performance of the model under random external Gaussian white noise excitation was investigated by using Monte Carlo simulation in Matlab/Simulink. Simulation showed that the spectral content and statistical characters of the contact force coincided strongly with reality. The random vibration character of the contact system was solved using time (numerical) domain simulation in this paper. Conclusions reached here are of great importance for reliability design of switching apparatus.  相似文献   

超薄膜Si外延生长过程的动力学蒙特卡罗模拟     

陈书汉 《广东教育学院学报》2011,(5):40-45

建立超薄膜Si外延生长的晶格一动力学蒙特卡罗模型,并应用该模型模拟了Si原子在Si（111）基底上外延生长的过程．系统研究了沉积时间、基片温度对于薄膜初始生长形貌的影响,如影响粒子的扩散与凝聚、岛的生长等微观过程．  相似文献   

The Misspecification of the Covariance Structures in Multilevel Models for Single-Case Data: A Monte Carlo Simulation Study     

Mariola Moeyaert  Maaike Ugille  John M. Ferron  S. Natasha Beretvas  Wim Van den Noortgate 《Journal of Experimental Education》2016,84(3):473-509

The impact of misspecifying covariance matrices at the second and third levels of the three-level model is evaluated. Results indicate that ignoring existing covariance has no effect on the treatment effect estimate. In addition, the between-case variance estimates are unbiased when covariance is either modeled or ignored. If the research interest lies in the between-study variance estimate, including at least 30 studies is warranted. Modeling covariance does not result in less biased between-study variance estimates as the between-study covariance estimate is biased. When the research interest lies in the between-case covariance, the model including covariance results in unbiased between-case variance estimates. The three-level model appears to be less appropriate for estimating between-study variance if fewer than 30 studies are included.  相似文献   

基于MATLAB的结构可靠度分析方法研究   总被引：1，自引：1，他引：0  

李远瑛  张德生 《嘉应学院学报》2011,29(2):45-48

基于结构可靠度分析方法—JC法、蒙特卡罗法和响应面法的基本原理,利用MATLAB软件对算例编制了相应计算程序,并对计算结果进行了比较.计算结果表明,利用MATLAB可以编制结构可靠度分析程序,计算结果较快,数据合理,并为复杂结构的可靠性分析提供参考.  相似文献   

Dynamic Monte Carlo simulation of linear SAW polymer chain near a flat surface     

黄建花  韩世钧 《浙江大学学报(A卷英文版)》2004,5(6):699-704

Investigation of the conformational properties of a SAW polymer chain near an impenetrable, non-interacting flat surface showed that the chain at first contracted and orientated itself to slightly parallel when it pulled close to the surface and at last elongated and reoriented itself to slightly perpendicular to the surface at very small distance from the surface. Simulation showed that most of the disappeared configurations were of large size at moderate distance from the surface while they were of small size at very small distance from the surface; and that the mean-square end-to-end distance was much more prone to be influenced by the surface than the mean-square radius of gyration . The orientational correlation between the direction of the longest principal axis of the moment of inertia and end-to-end vector was also discussed.  相似文献   

基于Monte Carlo方法的散射介质对光束偏振态的影响分析     

付军 《环球赛鸽科技》2015,(11)

为了能准确分析光束的偏振特性在大气传输过程中所受到的影响,特别是在光束发生散射后含有决定大气光学特性的偏振信息这一目的。采用Stokes-Mueller方法处理光束偏振态,以及Monte Carlo方法对偏振光的传输特性进行建模分析。  相似文献