Two possible hydrothermal vents in the northern Okinawa Trough

As the Okinawa Trough is a back-are basin in early spreading, modern submarine hydrothermal activity and minerallization have many characteristics which have aroused wide attention. Up to now three well-known hydrothermal venting areas are all located in the middle part of the trough, During two cruise investigations to map and sample the seafloor numbers of Calyptogena sp, shells were dredged at two sites in the northern trough with comparatively thicker crust and numerous submarine volcanoes. Based on the fact that Calyptogena sp, is only observed around the hydrothermal vents and lives on hydrothermal activities, it is predicted that there is the possibility of modern hydrothermal activities in the northern part of the trough. In this note, the shell is carefully characterized and the sample locations with possible hydrothermal activity are given. it Is pointed out that the research of biogenic fossils to trace hydrothermal activity changes in venting time, strength fluctuations, evolution In chemical compositions and so on should be stressed in the future in addition to the study of the ecological characteristics of hydrothermal organisms.

The variability of eddy kinetic energy in the South China Sea deduced from satellite altimeter data

We used fifteen years (1993-2007) of altimetric data, combined from different missions (ERS-1/2, TOPEX/Poseidon, Jason-1, and Envisat), to analyze the variability of the eddy kinetic energy (EKE) in the South China Sea (SCS). We found that the EKE ranged from 64 cm(2)/s(2) to 1 390 cm(2)/s(2) with a mean value of 314 cm(2)/s(2). The highest EKE center was observed to the east of Vietnam (with a mean value of 509 cm(2)/s(2)) and the second highest EKE region was located to the southwest of Taiwan Island (with a mean value of 319 cm(2)/s(2)). We also found that the EKE structure is the consequence of the superposition of different variability components. First, interannual variability is important in the SCS. Spectral analysis of the EKE interannual signal (IA-EKE) shows that the main periodicities of the IA-EKE to the east of Vietnam, to the southwest of Taiwan Island, and in the SCS are 3.75, 1.87, and 3.75 years, respectively. It is to the south of Taiwan Island that the IA-EKE signal has the most obvious impact on EKE variability. In addition, the IA-EKE exhibit different trends in different regions. An obvious positive trend is observed along the east coast of Vietnam, while a negative trend is found to the southwest of Taiwan Island and in the east basin of Vietnam. Correlation analysis shows that the IA-EKE has an obvious negative correlation with the SSTA in Nio3 (5A degrees S-5A degrees N, 90A degrees W-150A degrees W). El Nio-Southern Oscillation (ENSO) affects the IA-EKE variability in the SCS through an atmospheric bridge-wind stress curl over the SCS. Second, the seasonal cycle is the most obvious timescale affecting EKE variability. The locations of the most remarkable EKE seasonal variabilities in the SCS are to the east of Vietnam, to the southwest of Taiwan, and to the west of Philippines. To the east of Vietnam, the seasonal cycle is the dominant mechanism controlling EKE variability, which is attributed primarily to the annual cycle there of wind stress curl. In this area, the maximum EKE is observed in autumn. To the southwest of Taiwan Island, the EKE is enlarged by the stronger SCS circulation, which is caused by the intrusion branch from the Kuroshio in winter. Finally, intra-annual and mesoscale variability, although less important than the former, cannot be neglected. The most obvious intra-annual and mesoscale variability, which may be the result of baroclinic instability of the background flow, are observed to the southwest of Taiwan Island. Sporadic events can have an important effect on EKE variability.

鹅观草属部分种的叶表皮微形态特征及其分类学意义

在过去叶表皮实验的基础上,本文从鹅观草属不同组、系中新增解剖了16 个有代表性的种。根据这些种叶片反映的表皮微形态特征,进一步证实了鹅观草属共族分属以及属下类群划分的正确性,揭示了属中各主要类群的演化水平和系统发育关系。研究结果最后表明:鹅观草属的半颖组最原始,在系统发育中它可能既派生了较进化的小颖组和大颖组,又派生了最进化的长颖组;在大颖组中,齿草系较原始,纤毛草系较进化,宽叶草系最进化,纤毛草系和宽叶草系可能相继起生于齿草系。并且,鹅观草属的这种进化关系同过去细胞学和形态学提供的证据是基本一致的。

虚拟数控车削物理仿真系统的研究与开发

面向数控车削 ,开发了一套动态车削物理仿真系统 ,提出了仿真系统的总体框架 ,建立了动态物理仿真模型及相关子模型 ,分析了动态车削过程的影响因素 ,阐述了系统开发过程中有关模型构成及工件数据描述等技术性问题。

基于多代理和规则调度的敏捷调度系统研究

研究了在敏捷制造环境下制造车间生产过程的动态调度问题。针对敏捷化调度的特殊要求 ,提出了综合运用多代理机制与规则调度实现敏捷化制造车间生产过程动态调度的方法 ,建立了基于多代理生产组织和运行模式的生产过程动态调度系统框架结构 ,研究了在多代理结构的基础上实现规则调度的方法 ,创建了适应实际生产环境的代理的模型结构 ,并以一类敏捷加工车间动态调度的仿真研究说明所提出方法的思路和可行性。

基于KQML语言的合同网协议模型及实现

本文首先分析了基于 KQML会话的 Multi- Agent系统 ( MAS)构成及其特点 ,然后提出了基于 CORBA、KQML的合同网协议 ( CNP)系统模型及 Agent通信模型 ,并针对此合同网模型 ,结合调度系统实例分析了其中 KQML语言的形式化表达方式

溶液介质条件对Fe^3＋共沉淀去除Cu^2＋的影响

采用室内试验方法，研究了溶液介质条件对Fe^3+共沉淀去除Cu^2+的影响。试验结果表明，pH是影响Fe^3+共沉淀去除Cu^2+的主要因素之一，其去除率随pH的增加而增加，并且其固液分配系数Kd的对数值与pH之间显示出较好的线性关系；天然水体中溶解的电解质离子及无机和有机配位体对Cu^2+的去除均产生很大影响，Cu^2+的去除率随加入的NaCl和NaClO4浓度的增加而降低，而随Ca(NO3)2和Mg(NO3)2浓度的增加而增加，除磷酸盐的增强作用外，硫酸钠、碳酸氢钠、甘氨酸、草酸钠、柠檬酸钠以及十二烷基苯磺酸钠的加入则不同程度地减弱了Cu^2+的去除；与Cu^2+共存的等量竞争阳离子Pb^2+、Zn^2+和Cd^2+也同样减弱了Fe^3+对Cu^2+的去除。