水槽造流系统水力计算与泵机选择

提供一种完整的用于试验水槽造流系统的水力计算和泵机选择方法 ,可用于其他类似工程设计。     

吸收式造波机和宽式波浪槽

介绍一种宽式波浪槽，槽中设有一组吸收式造波机，它能吸收反射波。     

Identification of Epinephelus malabaricus and Epinephelus coioides using DNA markers

1 IntroductionBothEpinephelus malabaricusandE. coioidesbelong to the genusEpinephelus(Perciformes: Ser-ranidae: Epinephelinae).They are warm water reeffishes that have similar distribution ranges as well assimilar morphological characteristics, which have…     

一种简易的晚第四纪地层连续取心方法

在长江三角洲地区晚第四纪地层连续取心钻探工作中，通过选用大功率钻机以及在传统的单管单动取土器中塞入PVC塑料管的取土方法，在所钻进的65-91m深度内的4口取心井中，平均取心率达81．6％。岩心内部原生沉积层理清晰，扰动很小，可满足晚第四纪长江三角洲古环境演变研究的要求。     

中国海岸风成沙ESR测年的研究

介绍ＥＳＲ测年的基本原理，并讨论风成沙Ｇｅ心测年的可行性、风成沙Ｅ＇心的特征、测年误差及可靠性等问题。１９９２－１９９３年在渤、黄、东、南海沿岸采集的１００余个风成沙样品ＥＳＲ测年实验表明，绝大部分海岸风成沙的年龄为１－７万年。     

甲状腺素对斜带石斑鱼仔鱼变态的影响

用甲状腺素(Thyroxine,T4)处理斜带石斑鱼Epinepheluscoioides仔鱼,研究T4对仔鱼变态的影响。仔鱼在变态前期和变态高峰期,用0.01mg·L-1T4处理7d后仔鱼完成变态,用0.10mg·L-1T4处理4d后仔鱼完成变态,用1.00mg·L-1T4处理3d后仔鱼完成变态,对照组仔鱼在实验期间未能完成变态。用0.01mg·L-1T4处理变态高峰期仔鱼其存活率明显提高和全长增长明显变慢,但对变态前期仔鱼无影响;用0.10和1.00mg·L-1T4处理变态前期和变态高峰期仔鱼,其存活率显著降低和全长增长明显变慢。结果表明,在变态高峰期用0.01mg·L-1T4处理仔鱼能加速它的变态并提高其存活率。     

板块碰撞时会聚边缘的地质状况

板块碰撞时会聚边缘的地质状况ＡｓａｈｉｋｏＴａｉｒａ在现代地球上，大地构造板块多会聚于深海海沟或碰撞槽内（参见１９９２冬季／９３Ｏｃｅａｎｕｓ中有关岛弧、深海沟和弧后盆地的讨论），海洋钻探已提供了有关板块碰撞过程方面的主要信息，包括从俯冲板块到仰冲板...     

The Effect of Internal Fluid on the Response of Vortex-Induced Vibration of Marine Risers

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.     

Determination of the Critical Value of Deflection for Embedded Cylindrical Structures

An embedded cylinder is a large-diameter cylinder embedded in a soil foundation. The state of failure of such an embedded cylindrical structure shows large deflection instead of slide and overturn of the traditional gravity type of structure placed on a rubble base or foundation base. The critical value of deflection of the embedded cylindrical structure, which is the maximum allowable deflection for stability calculation of the cylinder, is a vital control value. Through investigation on deflection and soil pressures on an embedded cylinder by model experiments, the variations of the angle of rotation θ of a cylinder with effective anti-overturning ratio η and moment MH of thrust are discussed. On the basis of experimental study, the critical value of deflection of the cylindrical structure is proposed in the paper. Meanwhile, the formulas for calculating deflection of cylinders are derived.