A Linear Programming Model for Seabed Oil-Gas Pipe Network     

LI Hongwei  TAN Jiahua Ph. D. Candidate  School of Naval Architecture  Ocean Engineering  Shanghai Jiaotong University 《中国海洋工程》1998,(4)

This paper analyzes the pipe network system of oil-gas collection and transportation foroffshore oilfield development.A"0-1"integer linear programming model is constructed to optimize theinvestment of seabed pipe network.The mathematical model is solved by the spanning tree method ofgraph theory and network analysis.All spanning trees of a network graph compose all the feasible solu-tions of the mathematical model.The optimal solution of the model is the spanning tree with the minimumcost among all spanning trees.This method can be used to optimize the seabed pipe network system andgive a minimum cost plan for the development of offshore marginal oilfield groups.  相似文献   

钝顶螺旋藻部分原生质体及单细胞的制备与培养   总被引：21，自引：0，他引：21  

秦松  王希华  童顺  曾呈奎 《海洋与湖沼》1995,26(1):109-112

于1992年1月-1994年4月，进行超声波处理方法制备钝顶螺旋藻部分原生质体以作为基因工程受体，以及制备单细胞用于固体平板克隆化培养的研究。研究结果表明：超声波以20kHz频率、15W功率作用30s，可使藻丝体断裂成15．0±1．6个细胞长度；延长作用时间，至2－6个细胞长度时，细胞壁结构遭到破坏，形成部分原生质体；继续作用，可形成少量原生质体和大量单细胞。断裂藻丝体、部分原生质体、单细胞以及原生质体均可涂布于固体培养基上再生或生长。以一定密度涂布单细胞与原生质体，能够形成彼此分开的单个克隆，可用于筛选及遗传分析。本文提供了一种节省溶菌酶的制备螺旋藻透性体的方法，超声波作用利于外源基因的导入，而涂布培养利于进一步的筛选和形成克隆。  相似文献   

应用遗传神经网格方法分析赤潮监测数据   总被引：1，自引：1，他引：1  

杨建强  高振会  孙培艳  石强  李钦亮 《海洋科学进展》2002,20(2):77-82

简要介绍了遗传神经网络方法的原理 ,探讨了应用遗传神经网络方法研究辽东湾海域丹麦细柱藻 (Leptocylindrusdanicus)赤潮与其环境因子之间的关系 ,计算了各环境因子对丹麦细柱藻赤潮的贡献。结果表明 ,温度、盐度、DIN的变化对研究海域丹麦细柱藻种群密度的增长有比较重要的影响 ,DIN是营养限制因子。遗传神经网络是分析赤潮监测数据的有效方法 ,值得进一步探索  相似文献   

中华绒螯蟹人工半咸水工厂化育苗试验研究报告   总被引：1，自引：0，他引：1  

刘连科  王洪芬 《海洋湖沼通报》1991,(3):80-83

在盐度为14—19‰的人工海水中,温度20—25℃条件下,189只平均体重100g的抱卵亲蟹产蚤状幼体4025万只。布苗密度为50—100万只/m~3为宜。必须经常换水,保持水质良好。人工饵料以单胞藻和丰年虫无节幼体为主,可适当加喂蛋黄。  相似文献   

Development of fouling communities on vertical structures in the Baltic Sea   总被引：6，自引：2，他引：6  

Susanne Qvarfordt  Hans Kautsky  Torleif Malm 《Estuarine, Coastal and Shelf Science》2006,67(4):618-628

The pillars of the bridge connecting the Island of Öland with the Swedish mainland were rebuilt between 1990 and 2000. The renovation produced pristine vertical concrete substrates, which became submerged in known years and seasons. The fouling communities on the pillars were examined in 2001 to determine whether the community structure could be explained in terms of either orderly successional development or of seasonal variation in the settlement of benthic organisms. As well, the communities on the pillars were compared to communities on the vertical surfaces of boulders in the area. The results indicated that an annual species composition is the final stage in the succession on the observed, vertical constructions. The few perennial species add to the variation between pillars as they increase in biomass (Polysiphonia fucoides) or become out-competed (Balanus improvisus). Also, observed seasonal differences in the biomass of these perennial species indicated that the time of year free space becomes available might be an important determinant of the future structure of the community. Comparison between the pillar and boulder communities showed that the artificial structures were not surrogates for the natural hard substrate: pillar communities differed in that they lacked most perennial algal species and had a high biomass of B. improvisus.  相似文献   

Neural network for wave forecasting among multi-stations     

Ching-Piao Tsai  Chang Lin  Jia-N Shen 《Ocean Engineering》2002,29(13):1685-1695

Unlike in the open sea, the use of wind information for forecasting waves may encounter more ambiguous uncertainties in the coastal or harbor area due to the influence of complicated geometric configurations. Thus this paper attempts to forecast the waves based on learning the characteristics of observed waves, rather than the use of the wind information. This is reported in this paper by the application of the artificial neural network (ANN), in which the back-propagation algorithm is employed in the learning process for obtaining the desired results. This model evaluated the interconnection weights among multi-stations based on the previous short-term data, from which a time series of waves at a station can be generated for forecasting or data supplement based on using the neighbor stations data. Field data are used for testing the applicability of the ANN model. The results show that the ANN model performs well for both wave forecasting and data supplement when using a short-term observed wave data.  相似文献   

海底油气集输管网可靠性评估   总被引：1，自引：0，他引：1  

刘震  潘斌 《海洋工程》2003,21(4):104-109114

对海底油气集输管网进行了可靠性评估，提出了一种适用于树状海底油气集输管网可靠性评价的方法，将流可靠度和单元重要度的概念引入到海底油气集输管网可靠性的分析中，该方法能够有效地评价海底油气集输管网的可靠性。  相似文献   

一种基于异步串行口的IBM-PC局部网     

陈汉权  刘育坤 《热带海洋学报》1993,(4)

在综合的科学考察船上以异步通讯口实现的IBM-PC局部网具有较好的性能价格比。本文介绍了该网的联网环境、网络系统的组成及其拓扑结构、网络的服务功能以及网络软、硬件的安装和配置。  相似文献   

红海榄人工幼苗藤壶分布特征研究   总被引：4，自引：0，他引：4  

莫竹承  范航清  何斌源 《热带海洋学报》2003,22(1):50-54

调查了广西珍珠港人工红海榄幼苗叶片上藤壶分布的特征。结果显示,在一年生幼苗叶片上藤壶的空间分布格局总体上为聚集分布。分布型因海水盐度的变化而变化,在高潮盐度Sh<20.21的海水区域内,藤壶趋向于随机分布,反之则表现为聚集分布。大约在分点潮高潮位以下,平均每日潮水浸淹时间超过5.6h的潮滩上藤壶的危害明显加再,影响了红海榄幼苗的正常生长。  相似文献   

莫桑比克罗非鱼孵卵期间口腔粘膜变化的研究     

楼宝城  林华英  蒋明星 《中国海洋大学学报(自然科学版)》1990,(2)

用组织学、组织化学和酶技术,对雌性莫桑比克罗非鱼在孵卵前后口腔粘膜的组织结构、抗菌酶的比活力变化进行初步研究。结果表明:在口腔粘膜的上皮中,杯状细胞是一个重要的结构,它随着雌鱼的生理状态的改变而变化。雄鱼、雌鱼和孵卵期的雌鱼口腔粘膜上皮中的杯状细胞数量上的差别显著。孵卵期的雌鱼口腔粘膜类似于哺乳动物的子宫粘膜也是受性激素影响的靶器官。该种鱼的口腔粘膜中存在着两种抗菌酶;蛋白质水解酶和壳多糖酶。孵卵前后,这两种酶的比活力分别提高1.4—2.03倍。说明孵卵时,口腔粘膜为使卵及仔鱼健康的发育,增强了抗菌能力。研究结果证明:抗菌力的增加与口腔粘膜中的杯状细胞的大量增生有着密切的关系。  相似文献