深水管汇下垂式下放安装入水过程分析研究

下垂式安装较适用于深水水下设施下放，且对安装船舶的要求小，操作方便。本文采用船体、索和水下设施三者间的非线性耦合时域分析技术，建立了安装船舶水动力计算模型、安装吊索和水下设施Morison模型，检查收敛精度，选择计算参数。针对管汇下垂安装入水过程进行数值模拟分析，对我国深海工程施工有一定的参考价值。     

改进元胞遗传算法的转塔式贴片机贴装优化

研究了转塔式贴片机的贴装过程优化问题,将其分解为元件贴装顺序和供料器布置,建立以组装时间最短为目标的贴装过程优化模型,然后采用元胞遗传算法对模型进行求解,基于问题的特点提出二维分段式的十进制编码方式,在遗传操作过程中运用改进的顺序交叉和自适应的变异操作,并在算法中结合局部搜索策略,实现了贴装顺序和供料槽布置的同时优化.实例求解和对比结果表明本算法在求解效率和求解结果上都优于传统遗传算法,从而证明了该算法的有效性.     

基于划分和压缩数据库的改进Apriori算法

针对Apriori算法在面对大规模数据时效率较低的问题,提出了一种基于划分和压缩数据库的改进方法。该方法首先依据特征数据出现的频率将数据按照升序存储在临时数组中;然后将原始事务数据库分为几个互不相交的事务数据库,使得子数据库能够容纳在内存中;最后根据每个子数据库计算出的频繁项集计算整个数据库的频繁项集,从而消除了不必要的冗余数据。通过改进可以将大规模数据集进行有效的划分和压缩,对子数据库进行关联规则挖掘。实验结果表明,改进的Apriori算法在针对海量数据挖掘的执行速度和效率都有很大提高。     

Pinning Synchronization of Coupled Oscillators with Paired Topologies

This paper investigates the pinning synchronization of a group of coupled oscillators, where both the dissipative and restorative interactions are taken into consideration. The paired coupling topologies are introduced to capture this feature of the dynamics. To realize the synchronization of the coupled oscillators, the pinning control is introduced, and two pinning criteria are proposed to ensure the synchronization. Both these two proposed criteria provide sufficient and necessary conditions for pinning synchronization of the coupled oscillators with paired topologies. Simulation examples are illustrated to verify the proposed theoretical results.

     

土耳其语中的“-ler”和汉语中的“们”分析对比

土耳其语中复数词缀"-ler"在土语语法里有很多的作用。本文试图对土耳其语中的复数词缀"-ler"和汉语中的"们"进行分析和比较,是想从语法意义上寻找到它们的异同点。希望对学习土耳其语的中国学生以及学习汉语的土耳其学生有所帮助。     

Preface

正It is well known that the increases in atmospheric CO2and CH4(long-lived greenhouse gases;GHGs)owing to anthropogenic activity are the dominant processes driving global climate change.Space-based measurements of GHGs with high precision,resolution,and global coverage are urgently needed to characterize the geographic distribution of their sources and sinks,and to quantify their roles in the atmospheric CO2budget.Over the past 10 years,the European Space Agency(ESA),the National Aeronautics     

Microelectronics-embedded channel bridging and signal regeneration of injured spinal cords

Due to the difficulty in spinal cord regeneration with biological methods, the microelectronic neural bridge, a new concept based on microelectronic technology, is presented. The microelectronic system has been realized in the forms of hybrid and integrated circuits. The integrated circuits for neural signal detection, stimulation, and regeneration are realized in a CMOS process. In animal experiments with 100 toads, 48 rats, and 3 rabbits, nerve signals have been successfully detected from spinal cords and sciatic nerves, and functional electrical stimulation has been carried out for spinal cords and sciatic nerves. When the microelectronic system is bridged between the controlling and stimulated nerve, the relevant motion of legs and nerve signal waveforms, which are stimulated by the evoked or spontaneous nerve signal through such a system, have been observed. Therefore, the feasibility of the presented method was demonstrated.