利玛原甲藻腹泻性毒素的生物学测定   总被引：1，自引：0，他引：1  

邱德全  林永水  周近明  熊仕林 《热带海洋学报》1996,(4)

１９９４年和１９９５年分季度从海南省三亚海区采集附生于褐藻上的利玛原甲藻Ｐｒｏｒｏｃｅｎｔｒｕｍｌｉｍａ（Ｅｈｒｅｎｂｅｒｇ）Ｄｏｄｇｅ，经丙酮提取。提取液用ｐＨ＝３的水除去麻痹性贝毒（ＰＳＰ），取残留液注入小白鼠（ＢａＢ／Ｃ纯系），有腹泻性贝毒（ＤｉａｒｒｈｅｔｉｃＳｈｅｌｌｆｉｓｈＰｏｉｓｏｎｉｎｇ即ＤＳＰ）中毒的症状出现。初步确定此种藻中提取的毒素为ＤＳＰ。  相似文献   

A moving PIV system for ship model test in a towing tank     

Jeng-Horng Chen  Che-Chun Chang 《Ocean Engineering》2006,33(14-15):2025-2046

A moving particle image velocimetry (PIV) system was successfully developed and used in a large towing tank for ship model tests to observe velocity fields near ship models. The experimental method involved adjustable optical devices for various test conditions and a special particle-seeding device. The streamwise and cross-streamwise flow fields of a yacht model and a tanker model were measured. Ship type, bottom shape, and towing speed were found to be the causes of problems affecting optical access and image quality. Possible solutions, deeper optical ducts, dark painting color, and pre-processed analysis method, were proposed and discussed.  相似文献   

海洋动床物理模型试验地形制作技术     

刘自力  刘学海  纪育强  马小兵  于凯本  毕忠野 《海岸工程》2007,26(3):42-46

试验模型地形制作是物模试验的一个基本工作,模型制作的好坏直接关系到实验的精度.模型试验之前,需要根据相似理论,选取合适的材料,按照一定的几何比尺进行模型的制作.通过2个具体工程作为实例说明了模型制作的过程、制作的技术性问题和制作经验.  相似文献   

结构损伤初步定位的简便方法     

孟海平  杨永春  杨风艳 《中国海洋大学学报(自然科学版)》2006,36(5):785-789

提出将基于动态特性的检测方法与局部物理检测手段相结合的探伤思路。利用动力学方法进行实时监测及损伤区域的粗略定位,再由物理探测方法实现损伤程度和位置的精确判断,从而降低对动态检测方法的精度要求。此外,文中尝试直接由结构的动力响应信号构建能量指标识别结构损伤的方法,不需要进行模态参数识别,算法简单,有望应用于海洋平台、高层建筑等可简化为串联多自由度体系的结构的实时监测和损伤初步定位。  相似文献   

An experimental study on non-linear progressive wave-induced dynamic stresses in seabed     

S.C. Chang  J.G. Lin  L.K. Chien  Y.F. Chiu   《Ocean Engineering》2007,34(17-18):2311-2329

In this study, the dynamic stresses within the seabed induced by non-linear progressive waves were explored through a series of hydraulic model tests on a movable bed within a wave flume. By comparing Stokes’ 2nd-order wave theory with the theory of wave-induced dynamic stresses within the seabed as proposed by Yamamoto et al. [1978. On the response of a poro-elastic bed to water waves. Journal of Fluid Mechanics 87 (1), 193–206.] and Hsu and Jeng [1994. Wane-induced soil response in an unsaturated anisotropic seabed of finite thickness. International Journal for Numerical and Analytical Methods in Geomechanics 18, 785–807], the experimental results show that the pressure on the seabed surface, the pore water pressure within the seabed as well as the vertical and the horizontal stresses are all smaller than their theoretical values. If we were to obtain the characteristics of seabed soil, the analytical solution of Hsu and Jeng [1994. Wane-induced soil response in an unsaturated anisotropic seabed of finite thickness. International Journal for Numerical and Analytical Methods in Geomechanics 18, 785–807] might agree to the simulation of the wave-induced effective stresses and shear stress in the sandy seabed. A different phase shift exists among all the three soil stresses. Their influences on the three dynamic stresses within seabed soil are important for seabed stability, and can be used in the verification of numerical models. In the whole, the non-linear progressive waves and the naturally deposited seabed are found to have a strong interaction, and the behavior of the induced dynamic stresses within the seabed is very complicated, and should be investigated integrally.  相似文献   

端元分析模型在长江口邻近海域沉积物粒度数据反演方面的应用   总被引：1，自引：1，他引：1  

张晓东  翟世奎  许淑梅 《海洋学报》2006,28(4):159-166

海洋沉积物粒度分布曲线往往同时具有多个峰,而且同一类型沉积物因时间和空间上的不同其粒度分布曲线峰的位置也不同,沉积物粒度分布多峰的特点反映了沉积物不同的输运形式和沉降过程[1,2].因此,在沉积物的粒度分布数据中保存了有关沉积物输运和沉降的信息,而获得这些信息对于揭示沉积区域水动力特性、沉积物输运和沉降规律具有重要的意义.  相似文献   

重金属锌,铅对菲律宾蛤仔的急性毒性试验   总被引：14，自引：1，他引：14  

刘琼玉  洪华生 《台湾海峡》1997,16(1):50-54

本文研究了必需元素Ｚｎ及非必需元素Ｐｂ对菲律宾蛤仔的急性毒性作用，得到Ｚｎ对其的４８ｈＬＤ５０和９６ｈＬＤ５０分别为１４７．９１、１６．４０ｍｇ／ｄｍ＾３；Ｐｂ对其的４８ｈＬＤ５０和９６ｈＬＤ５０分别为３１．６２、１４．２８ｍｇ／ｄｍ＾３。估算得到Ｚｎ、Ｐｂ对菲律宾蛤仔的安全浓度分别为０．８２、０．７１ｍｇ／ｄｍ＾３。  相似文献   

长江口泥沙絮凝静水沉降动力学模式的试验研究   总被引：10，自引：1，他引：10  

关许为  陈英祖 《海洋工程》1995,(1)

细颗粒泥沙在咸水中的絮凝沉降是河流泥沙向海输送过程中在河口区发生的重要现象，是河口拦门沙形成与发育的主要原因之一。本文根据室内模拟试验研究，提出长江口泥沙絮凝静水沉降的二级动力学模式，通过该式求得不同泥沙含量和盐度情况下絮凝沉降的衰减系数，半衰期和平均沉降速率等动力学参数，定量地分析泥沙含量和盐度对泥沙絮凝沉降过程的影响。  相似文献   

The Effect of Internal Fluid on the Response of Vortex-Induced Vibration of Marine Risers   总被引：5，自引：1，他引：5  

郭海燕  王元斌傅强 《中国海洋工程》2004,18(1):11-20

Based on Iwan‘s wake oseillator model developed with the classical van der Pol equalion, the differential equation for the response of the vortex-induced vihration (VIV) of the riser considering the effect of the internal flowing fluid and the external marine environmental condition is derived. The effect of the intermal flowing fluid on the response of VIV of the riser is studied by means of the Finite Element Method. The results show that the effect of the internal fluid velocity on the VIV of the riser is strong when the natural frequency of the riser is close to the vortex shedding frequency. In addition, the increase of the top tension can decrease the sensitivity of the riser to the internal fluid velocity.  相似文献   

Modelling the effect of swimbladder compression on the acoustic backscattering from herring at normal or near-normal dorsal incidences     

Gorska  Natalia; Ona  Egil 《ICES Journal of Marine Science》2003,60(6):1381-1391

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