Observations of the countercurrent on the inshore side of the Kuroshio northeast of Taiwan

Intensive current measurements in the area northeast of Taiwan indicate subsurface, southwestward flow existed between the inshore edge of the Kuroshio and the East China Sea continental slope. At 70 km away from Taiwan, this countercurrent has a mean speed about 30 cm s^–1 at mid-depth. Closer to Taiwan, the flow turns along with the topography, and subjects to sidewall and bottom friction. Both the magnitude and the vertical shear of this countercurrent are comparable with that inferred from hydrographic survey. The wind field features short-period (a few days) fluctuations associated with the cold front passages, however, this is not reflected on the current records. It appears that the countercurrent is fairly steady. Together with similar reversing flow found at places much further to the north, the overall pattern seems to be a general quasi-steady feature along most part of the shelf edge of the East China Sea.     

Circalittoral Macrobenthic Assemblages of Strymonikos Gulf (North Aegean Sea)

Abstract. Six macrobenthic assemblages of the circalittoral zone found in Strymonikos Gulf, North Aegean Sea, are described and compared with the corresponding ones from other Mediterranean and Atlantic areas. For the delimination of these assemblages and the evaluation of the major environmental gradients governing their distribution, several numerical techniques were used.     

用16S rRNA基因的内切酶图谱快速鉴别几种对虾病原菌

坎普氏弧菌是青岛海洋大学生物系微生物实验室于１９８９－１９９０年自对虾养殖场中国对虾红腿病心脏及血淋巴中分离并鉴定的菌株，副溶血菌和溶藻胶弧菌两菌株于１９９４年９月得自中国科学院微生物研究所，为建立快速、准确的中国对虾病原菌的诊断技术，根据几种细菌的１６ＳｒＲＮＡ基因的序列，设计并合成该基因的多聚酶反应的引物ＰＬ１和ＰＬ２。并用该对引物分别从坎普氏弧菌、副溶血弧菌和溶藻胶弧菌的ＤＮＡ要品中扩增出分     

Stratal patterns in the southwestern margin of the Ulleung Basin off southeast Korea: sequence architecture controlled by back-arc tectonism

 Major variations in type and rate of tectonic movement in the southwestern margin of the Ulleung Basin coincide in time with changes in stratal patterns at succession boundaries, suggesting that the effect of tectonism was dominant for the development of sequence architecture. During the back-arc opening (16–12 Ma), the rise of relative sea level and the high rate of sediment supply gave rise to sequences with sigmoid progradational patterns. During the back-arc closing (12–6.5 Ma), fall- and rise-dominated relative sea-level fluctuations resulted in sequences with varying stratal patterns depending upon changes in deposition rate. The rise-dominated relative sea level has been prevalent during the later stage (6.5 Ma–Present) with low sedimentation rate. Received: 16 January 1996 / Revision received: 7 February 1997     

4种重金属离子对海洋三角褐指藻生长影响的研究

于１９９３年４月－１９９３年５月以Ｚｎ＾２＋，Ｃｄ＾２＋，Ｐｂ＾２＋，Ｃｕ＾２＋不同浓度的海水对三角褐指藻进行生长影响的研究。实验表明，Ｃｕ＾２＋对三角褐指藻生长的毒性最大，其９６ｈＥＣ５０为０．０１７ｍｇ／Ｌ。Ｐｂ＾２＋的毒性最小，其９６ｈＥＣ５０为０．４６８ｍｇ／Ｌ。４种重金属离子的毒性顺序是Ｃｕ＾２＋＞Ｃｄ＾２＋＞Ｚｎ＾２＋＞Ｐｂ＾２＋，除Ｃｄ＾２＋外，其他３种金属离子对该单细胞藻的生长安全     

I(L)值完全诱导空间

作者引入 I(L)值完全下半连续映射 ,研究其性质。利用 I(L)值完全下半连续映射定义I(L)值完全诱导空间 ,给出 I(L)值完全诱导空间的拓扑基的表达形式 ,证得两个 I(L)值完全诱导空间的映射是连续映射的充分必要条件 ,并建立了乘积空间的 I(L)值完全诱导空间与 I(L)值完全诱导空间的乘积空间的联系     

Comparison of methods for computing hydrodynamic characteristics of arrays of wave power devices

A comparison of methods for the calculation of the hydrodynamic characteristics of arrays of wave power devices is presented. In particular, the plane-wave approximation and an exact multiple scattering formulation have been used to compute exciting wave forces, hydrodynamic coefficients and q factors for arrays of interacting wave power devices. The results obtained are compared with each other, and accuracy aspects of the computations are stressed and critically assessed.     

旋转谱理论探讨

本文应用向量随机过程分解模型对旋转谱作出物理解释;此外,还修改了线性振荡度的定义,导出了极化度、线性振荡度和旋转系数之间的关系式,并讨论了它们与总相干、同相相干、异相相干之间的关系。     

The impact of wave loads and pore-water pressure generation on initiation of sediment transport

The build-up of pore-water pressure by waves can lead to sediment liquefaction and subsequent transport by traction currents. This process was investigated by measuring pore-water pressures both in a field experiment and laboratory wave tank tests. Liquefaction was observed in the wave tank tests. The results suggest that sand is less susceptible than silts to wave-induced liquefaction because of the tendency to partially dissipate pore-water pressures. However, previous studies have determined that pore-water pressures must approach liquefaction before current velocities necessary to initiate transport are reduced. Once liquefaction has occurred more sediment can be transported.     

Launching and joining of a product carrier of 30,500 DWT built in two sections

This paper describes the process of launching and joining of two sections of a product carrier of 30,500 DWT built at Dianca shipyard at Puerto Cabello, Venezuela. The specifications and characteristics of this ship are in line with the market requirements. This paper deals with the problems encountered during the decision of dividing the ship in two halves, use of syncrolift for launching and subsequent joining of two halves in the dry dock.