Analysis of Offshore Oil Pipeline Floating Laying

-Based on the calculation model for the floating laying of the offshore oil pipeline, this paper analyses in detail the internal force, and deformation of the pipeline under a definite structural form (pipeline and buoy) and the way of pulling. The obtained results can be used for the buoy deployment, structure design, and the determination of pulling parameters (the pulling force of the cable and its length, etc.), providing an effective analysis method for floating pipeline-laying. A calculation example is given to show the related calculation process and the main results are analyzed and discussed.     

关于“包装产品的计量标准型一次抽检方案”的确定

本文给出了“包装产品的计量标准型一次抽检方案”,并通过一个实例说明本方案比一般《计量标准型一次抽检方案》更为优越。     

围隔生态系中叶绿素a浓度、化学耗氧量及透明度之间统计关系的研究

通过对水库中12个围隔两次取样的叶绿素a浓度(单位:μg/L)、化学耗氧量(单位:mg·O_2/L)和塞克透明度(单位:m)的实验数据分析,求得如下回归方程: (1)[Chla]=17.60·[SD]~(-1·86) r=-0.87 (2)[Chla]=-28.85+7.32·[COD] r=0.89 (3)[COD]=6.88·[SD]~(-0·68) r=0.91本文还对这些结果进行了讨论。     

长江口淡水端淡、盐水混合表层pCO2的急剧变化及其影响机制

根据2004年5月长江口淡水端淡、盐水混合初期表层水二氧化碳分压(pCO2)的实测数据,结合水文、化学和生物等要素的同步观测资料,对pCO2的变化及其影响因素进行了研究。研究结果表明:在长江口淡水端盐度0~15的淡、盐水混合初期,表层水pCO2由3 500μatm左右大幅度下降至约1 000μatm。生源要素的补充使生物活动的急剧增加是pCO2以对数形式大幅度降低的主要原因,这一性质显著体现的拐点为(S<0.6,50<浊度<110)这一范围。同时由于生物活动和物理混合作用的分别控制,使得长江口淡水端淡、盐水混合初期表层水碱度与盐度呈二次抛物线关系,拐点处的盐度约为0.6。     

Simple determination of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) using solid-phase microextraction and gas chromatography-mass spectrometry

Solid-phase microextraction (SPME) is a simple, sensitive and less destructive method for the determination of dimethylsulfide (DMS) in seawater. Combined with detection by gas chromatography-mass spectrometry (GC-MS), the method had sufficient sensitivity (minimum detectable concentration of DMS was 0.05 nM), and practical levels of reproducibility (relative standard deviation ≤7%) and linearity (r ² > 0.995) over a wide concentration range (0.5 to 910 nM). The protocol developed was applied to a Sagami Bay water sample to determine concentrations of DMS and DMSP, and in situ DMSP-lyase activity.     

Eddy Shedding from the Kuroshio Bend at Luzon Strait

TOPEX/POSEDIENT-ERS satellite altimeter data along with the mean state from the Parallel Ocean Climate Model result have been used to investigate the variation of Kuroshio intrusion and eddy shedding at Luzon Strait during 1992–2001. The Kuroshio penetrates into the South China Sea and forms a bend. The Kuroshio bend varies with time, periodically shedding anticyclonic eddies. Criteria of eddy shedding are identified: 1) When the shedding event occurs, there are usually two centers of high Sea Surface Height (SSH) together with negative geostrophic vorticity in the Kuroshio Bend (KB) area. 2) Between the two centers of high SSH there usually exists positive geostrophic vorticity. These criteria have been used to determine the eddy shedding times and locations. The most frequent eddy shedding intervals are 70, 80 and 90 days. In both the winter and summer monsoon period, the most frequent locations are 119.5°E and 120°E, which means that the seasonal variation of eddy shedding location is unclear.     

基于神经-模糊方法的单料烟感官质量评价专家系统

作者通过对单料烟评吸的结果与理化测定的指标参数进行分析 ,结合专家经验并采用神经 -模糊方法 ,提出一种基于单料烟的理化指标对各感官参数进行分类、分级 ,建造单料烟感官质量评价专家系统的方法。实验表明 ,该系统具有学习与知识提取能力 ,在卷烟产品质量管理新产品开发中具有指导意义     

西沙群岛的现代有孔虫Ⅱ

本文为我国西沙群岛现代有孔虫研究报告的第二部分。 笔者在《西沙群岛的现代有孔虫Ⅰ》一文中已报道了175种。本文共记述了底栖有孔虫240种(包括6个未定种)，其中的235种为首次记录，分隶于3亚目，10总科，38科，110属;有8个新属和86个新种。砂质胶结型种类有31种，占总种数的13.2%；钙质无孔型种类有48种，占总种数的20.4%；钙质有孔型种类有156种，占总种数的66.4%；浮游有孔虫未见有新增加的种类。凡是在前文己报道过的属以及本文重复报道的5个种，均不再加以描述。新种的模式标本均保存于中国科学院海洋研究所。 通过本文对现有的56份砂样所含有孔虫的分析鉴定，可以看出西沙群岛的有孔虫区系是极其丰富的。随着今后更全面的调查，特别是水下样品的进一步补充采集，待发现其他种类时，将另文报道。     

我国海平面年速率的分布和长周期分潮的变化

应用验潮站潮汐资料计算海平面年速率,绘出我国海平面年速率和等值线分布图并进行讨论,分析了我国海平面长周期分潮的变化。     

烟威及石岛近海春季水团分析

本文使用1960—1980年春季的水文资料,以温度和盐度作为主要指标,根据聚类分析逼近温盐图解,结合对该海域地理环境特征的分析,对烟台、威海及石岛近海春季的水团结构演变及其和渔场、渔期的关系进行综合分析。结果表明,北黄海及青岛外海的冷水团,以及黄海暖水团的强度与位置的变动,对春季渔期的早迟以及渔场位置的变动,都有很大的影响。