水槽造流系统水力计算与泵机选择   总被引：1，自引：0，他引：1  

孙东昌  张亭健  辛海英 《海洋科学进展》2002,20(2):125-132

提供一种完整的用于试验水槽造流系统的水力计算和泵机选择方法 ,可用于其他类似工程设计。  相似文献   

Microhabitat preferences and depth distribution of combtooth blennies (Blenniidae) in the Gulf of Trieste (North Adriatic Sea)     

Martina Orlando-Bonaca  & Lovrenc Lipej 《Marine Ecology》2007,28(3):418-428

The microhabitat preferences and depth distribution of blenniid species (Blenniidae) in the Gulf of Trieste (North Adriatic Sea) were surveyed using the all‐occurrence sampling method, a non‐destructive visual census method, aided by SCUBA diving. Fourteen species were identified during the entire survey. Four species showed to be indiscriminate in their microhabitat choice while 10 species were classified as infrequent in the surveyed coastal area. A statistically significant correlation was found between the blenniid assemblage and nine microhabitat variables. The blenniid assemblage was divided in two main groups, by the use of canonical correspondence analysis, electivity index, and the depth distribution analysis. The first group comprises species that dwell in surface waters and show a high positive correlation with boulders, the presence of Mytilus galloprovincialis, cirripeds and empty holes bored by Lithophaga lithophaga. The second group includes species that mostly inhabit deeper waters and show a high positive correlation with rocks covered by precoralligenous bioformations.  相似文献   

On dynamic coupling effects between a spar and its mooring lines     

Xiaohong Chen  Jun Zhang  Wei Ma 《Ocean Engineering》2001,28(7):79

The responses of a spar constrained by slack mooring lines to steep ocean waves and tensions in the mooring lines are simulated using two different numerical schemes: a quasi-static approach (SMACOS) and a coupled dynamic approach (COUPLE). The two approaches are the same in computing wave loads on the structure. Their difference is in modeling dynamic forces of mooring lines; that is the dynamic forces are included in the computation of COUPLE but neglected in SMACOS. The numerical simulation is examined against the laboratory measurements of the JIP Spar in a water depth of 318 m. The dynamic coupling effects between the JIP Spar and its mooring lines in different water depths (318, 618 and 1018 m) are investigated by the comparison of numerical simulations obtained using the quasi-static and coupled dynamic approaches. It is found that the damping of mooring lines reduces the slow-drift surge and pitch of the Spar, especially in deep water. The reduction in the amplitude of slow-drift surge can reach about 10% in a water depth of 1018 m. The tension in mooring lines may greatly increase in the wave frequency range when dynamic forces in mooring lines are considered. The mooring-line tension in the wave frequency range predicted by the coupled dynamic approach can be eight times as great as the corresponding prediction by the quasi-static approach in a water depth of 1018 m. This finding may have important implications for the estimation of the fatigue strength and life span of the mooring lines deployed in deep water oceans.  相似文献   

海底勘查技术的最新发展   总被引：4，自引：0，他引：4  

陈卫民 《海洋技术学报》1996,15(3):25-29

本文将介绍用于探测海底三维地质特征的海底勘查的最新发展。它主要包括海底地形测绘技术，海底形貌观测技术、海底地层声学探测技术等。  相似文献   

废弃海洋桩基平台拆除方案的系统决策研究   总被引：2，自引：0，他引：2  

阎宏生  郭海涛  韩圣章 《海洋技术学报》2004,23(4):81-84,95

海洋平台拆除是一项复杂的、受多种因素制约的、涉及许多技术领域的综合性系统工程。采取适当的拆除方案是工程安全、经济、环保地进行的基础和保证。针对这一问题，文章对拆除方案的评估进行了系统的研究，从环境、工艺、安全、经济、工期的角度建立了拆除方案评估指标体系，并综合运用群决策层次分析理论和模糊数学理论对拆除方案进行系统的评估。经实例验证，所建立的评估指标体系，可科学、公正、快捷地对方案进行评估，为决策者提供科学的决策基础。  相似文献   

Robust and adaptive path following for underactuated autonomous underwater vehicles   总被引：1，自引：0，他引：1  

K. D. Do  J. Pan  Z. P. Jiang 《Ocean Engineering》2004,31(16):1967-1997

This paper proposes a nonlinear robust adaptive control strategy to force a six degrees of freedom underactuated underwater vehicle with only four actuators to follow a predefined path at a desired speed despite of the presence of environmental disturbances and vehicle’s unknown physical parameters. The proposed controller is designed using Lyapunov’s direct method, the popular backstepping and parameter projection techniques. The closed loop path following errors can be made arbitrarily small. Interestingly, it is shown that our developed control strategy is easily extendible to situations of practical importance such as parking and point-to-point navigation. Numerical simulations are provided to illustrate the effectiveness of the proposed methodology.  相似文献   

维护体系良性运行 适应新版质量标准     

王婕  廉双喜 《海洋技术学报》2001,20(4):76-78

本文介绍了海洋技术研究所质量管理处在维护质量体系运行方面的主要作法和经验体会，结合2000版ISO9201标准的新内容，提出适应新版标准的想法。  相似文献   

莱西市水资源管理系统的人机互动功能     

齐勇  于诰方  李寿田  孙秀竹  胡翠红 《海洋湖沼通报》2007,(2):142-146

本文结合莱西市水资源管理的基本特性,采用人机交互管理方式,成功地运用地理信息系统(GIS),实现了界面良好的莱西市水资源信息系统的各种功能,为规范水资源业务管理的程序、开展地区水资源管理信息系统化建设,提供了有力的技术支持。  相似文献   

凡纳滨对虾咸淡水养殖系统内细菌群落组成的PCR-DGGE分析   总被引：16，自引：0，他引：16  

罗鹏  胡超群  谢珍玉  张吕平  任春华  许尤厚 《热带海洋学报》2006,25(2):49-53

采用PCR(polym erase chain reaction)-DGGE(denaturing grad ient gel electrophoresis)及传统的微生物培养方法对凡纳滨对虾Litopenaeus vannam ei咸淡水养殖系统内各种环境的细菌群落组成进行了比较研究。传统的微生物培养计数表明,从海湾水、养殖池水到对虾粪样,细菌和弧菌的数量表现出依次增加的趋势,粪样及肠壁中弧菌的数量高出外界水环境1—4个数量级。相对于外界水环境,粪样中有很高的芽孢杆菌孢子含量,但是肠壁定植细菌中不存在芽孢杆菌(孢子)。PCR-DGGE及聚类分析结果表明,从海湾沿岸、养殖池、对虾粪便到对虾肠壁,细菌群落的多样性由高到低,无论是在哪种环境,群落的优势种都十分明显,且只有2—4种。来自同一环境各样品间的细菌群落组成非常相似,来自不同环境的样品,其细菌群落组成差别较大。聚类图上各簇的排列顺序反映了样品在取样空间分布上的毗邻次序和它们的相似程度。  相似文献   

具有匹配不确定的奇异摄动系统的鲁棒控制   总被引：2，自引：0，他引：2  

高存臣  王宪杰 《中国海洋大学学报(自然科学版)》2004,34(5):918-920

对于同时具有结构匹配不确定和系统不确定量的奇异摄动系统，利用Lyapunov稳定性理论进行了鲁棒性研究。给出了1个理想奇异摄动系统的稳定鲁棒控制也是不确定奇异摄动系统稳定控制的稳定条件和鲁棒界，讨论了鲁棒界及其随参数变化的变化范围。本文是王宪杰，高存臣已有结果的推广。  相似文献