Magnetic anomalies in the canary basin and the Mesozoic evolution of the central North Atlantic     

W. R. Roest  J. J. Dañobeitia  J. Verhoef  B. J. Collette 《Marine Geophysical Researches》1992,14(1):1-24

The data from a recent magnetic compilation by Verhoefet al. (1991) off west Africa were used in combination with data in the western Atlantic to review the Mesozoic plate kinematic evolution of the central North Atlantic. The magnetic profile data were analyzed to identify the M-series sea floor spreading anomalies on the African plate. Oceanic fracture zones were identified from magnetic anomalies and seismic and gravity measurements. The identified sea floor spreading anomalies on the African plate were combined with those on the North American plate to calculate reconstruction poles for this part of the central Atlantic. The total separation poles derived in this paper describe a smooth curve, suggesting that the motion of the pole through time was continuous. Although the new sea floor spreading history differs only slightly from the one presented by Klitgord and Schouten (1986), it predicts smoother flowlines. On the other hand, the sea floor spreading history as depicted by the flowlines for the eastern central Atlantic deviates substantially from that of Sundvik and Larson (1988). A revised spreading history is also presented for the Cretaceous Magnetic Quiet Zone, where large changes in spreading direction occurred, that can not be resolved when fitting magnetic isochrons only, but which are evident from fracture zone traces and directions of sea floor spreading topography.Deceased 11 November 1991  相似文献   

栉孔扇贝Chlamys farreri(Jones & Preston,1904)染色体核型   总被引：3，自引：0，他引：3  

王梅林  郑家声  余海 《中国海洋大学学报(自然科学版)》1990,(1)

以鳃为材料,用秋水仙素—低渗—空气干燥制片方法,研究栉孔扇贝染色体核型,得出2n=38,NF=76,其中中部着丝点染色体3对,亚中部着终点染色体5对,亚端部着丝点染色体11对。与日本沿岸栉孔扇贝染色体数目相同,但核型不同。  相似文献   

A reliable and sensitive closing gear     

Lin Yuhui  Guo Qingbai  Lian Guanshan  Zheng Baoxing 《海洋学报(英文版)》1989,8(2):313-313

The model QQC_(2-2) plankton net closing gear is a device designed to control the stratifiedsampling of the plankton net by means of a messenger. The device in its fie1d use has met with98% success in 766 times of strtified sampling of plankton at 157 stations during separatesurveys of Fujian coast zone, the Taiwan Strait, and the central section of the South China Sea,  相似文献   

龙口的海风及其影响   总被引：4，自引：0，他引：4  

薛德强  赵绪孔 《海洋湖沼通报》1995,(3):1-9

本文运用龙口气象站近５年自记风资料及实测探空资料，分析了龙口海风的生消规律、海风强度、空间结构及海风生成后对温、湿度的影响。同时为分析海风环流对大气污染物的影响。本文提出了一个简单地计算热内边界层的方法。  相似文献   

福清湾北部及其以东近岸海域沉积环境和沉积特征     

郑承忠 《台湾海峡》1997,16(4):386-392

本文对福清湾北部及其以东近岸海域的地质地貌，潮流和波浪等沉积环境因素，以及对沉积物和悬浮泥沙的粒度，矿物特征进行研究，认为福清湾为溺谷型的半封闭潮汐汊道海湾存在着较大的潮差和潮流流速，沉积物沿潮流方向呈东粗西细和岸边细、向海变粗的潮流分异特征，潮流控制着沉积物的布局，而属于潮控的浅海沉积环境。  相似文献   

Analysis of Offshore Oil Pipeline Floating Laying     

Liang Zheng Lecture  Southwest Petroleum Institute  Nanchong  Sichun Province 《中国海洋工程》1994,(1)

-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.  相似文献   

关于“包装产品的计量标准型一次抽检方案”的确定     

陈峥  赵维谦  李晓川 《中国海洋大学学报(自然科学版)》1989,(4)

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。  相似文献   

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     

郑建瑜  袁峻峰 《海洋湖沼通报》1991,(3)

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。  相似文献   

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   总被引：4，自引：0，他引：4  

李岩  张龙军  苏征  王晓亮  潘建明 《中国海洋大学学报(自然科学版)》2006,36(2):295-298

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。  相似文献   

基于神经-模糊方法的单料烟感官质量评价专家系统   总被引：3，自引：0，他引：3  

林丽莉  冯天瑾  周文晖  郑宏伟 《中国海洋大学学报(自然科学版)》2001,31(6):931-936

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  相似文献