Effects of aqueous media on microbial removal of sulfur from dibenzothiophene in the presence of hydrocarbons

The existence of sulfur in the petroleum would erode the transport lines and poison the chemical catalysts. In addition, it is the main cause of air pollution and the for-mation of acid rain. At present, hydrodesulfurization (HDS) is the commonly used technology for fuel desulfu-rization. HDS has the disadvantages of high cost of ma-nipulation and equipment investment. Furthermore, HDS is difficult to remove the sulfur from condensed thio-phenes such as dibenzothiophene (DBT). These forms…     

单相低谐波整流器的控制方法

提出了一种能够有效降低输入电流谐波含量的高性能整流电路,并研究了该电路的PWM控制策略及控制系统. 通过PWM控制,可以降低输入电流谐波含量,同时提高整流电路的功率因数,研究结果表明该方法是可行的.     

Pattern差分编码水声通信研究

在Pattern时延差编码（PDS）通信体制的基础上,提出了Pattern差分编码方案.该方案将信息调制在相邻Pattern码的时延差上,减小了平均码元宽度,提高了通信速率.该方案通过码元分割降低了多途干扰,差分解码方式使其具有抗多普勒能力.现场试验中,定点通信实现了无误码传输,证明该体制能抑制多途干扰;移动通信误码率较低,证明该体制具有良好的抗多普勒能力.     

平潭太阳辐射状况分析

用回归分析法计算了平潭太阳辐射,并进行分析。结果表明,用线性回归计算太阳辐射值其精度合乎要求,不必采用非线性回归。但各月的回归系数应分别计算。不宜采用固定的或分时段的回归系数。计算得出:平潭的太阳辐射年平均值为4.5×10~3瓦/米~2,与福州相近。但出现峰值的时间不同。旬直接辐射最大值出现在七月中旬,最小值出现在十二月下旬;旬散射辐射最大值出现在六月下旬,最小值出现在一月上旬。平潭的D/Q年平均值为48％。     

Parallel scheduling strategy of web-based spatial computing tasks in multi-core environment

In order to improve the concurrent access performance of the web-based spatial computing system in cluster,a parallel scheduling strategy based on the multi-core environment is proposed,which includes two levels of parallel processing mechanisms.One is that it can evenly allocate tasks to each server node in the cluster and the other is that it can implement the load balancing inside a server node.Based on the strategy,a new web-based spatial computing model is designed in this paper,in which,a task response ratio calculation method,a request queue buffer mechanism and a thread scheduling strategy are focused on.Experimental results show that the new model can fully use the multi-core computing advantage of each server node in the concurrent access environment and improve the average hits per second,average I/O Hits,CPU utilization and throughput.Using speed-up ratio to analyze the traditional model and the new one,the result shows that the new model has the best performance.The performance of the multi-core server nodes in the cluster is optimized; the resource utilization and the parallel processing capabilities are enhanced.The more CPU cores you have,the higher parallel processing capabilities will be obtained.     

冰草属植物叶片解剖特征及其分类价值

运用解剖学的手段对冰草属５种植物的叶片表皮结构和横切面结构进行了观察，发现叶片远轴面的表皮结构对冰草属属下等级的分类具有一定的意义，其区别特征上要表现在长细胞的大小，细胞壁波纹状弯曲的程度、成对短细抱的数目、气孔带的数目、副卫细胞的形态、以及微毛和刺毛等表皮附属物的分布与形态特征上．     

超细纤维与超微细工程技术

本文从合成纤维的发展历史出发，讨论了超细纤维产生的必然性，介绍了超细纤维的纤度界限、特性以及与之密切相关的超微细工程技术，并对超细纤维的应用、发展趋势作了述评．     

概念树方法在F--KDD中的应用研究

数据采掘是数据库中知识发现的核心,详细描述了数据采掘中概念树方法在模糊性问题中的应用.     

基于Anytime算法的模型预测控制器的优化反馈调度

模型预测控制器可以实现为具有Anytime算法特征的模型预测控制（MPC）任务,它允许在执行时间和控制性能之间进行折衷．文中针对一组MPC任务,提出一种优化反馈调度算法（FS-CBS）,在有限处理器时间约束范围内使全局控制性能最大化．该算法为每个MPC任务分配了一个恒定带宽服务器（CBS）,并对CBS所预定的处理器时间进行动态调节,同时通过约束条件保证整个任务集的可调度性和各组分的稳定性．仿真结果表明,该算法对MPC运行时的执行时间变化不敏感,明显优于基本的CBS算法．