浮游动物除了前述的原生动物、轮虫、枝 角类、桡足类、毛颚动物和被囊动物外,在甲 壳动物、软体动物、环节动物等类群中尚有一 些浮游种类。此外腔肠动物中虽然以浮游种类 为主,但饵料意义不大。本章简略介绍其它甲 壳动物、浮游软体动物、浮游多毛类和腔肠动 物

海水淡化过程中能源消耗、固废物、浓盐水和化学药品的排放,以及排放废水的温度等问题,长期看存 在对海洋生态环境的潜在影响。这些问题需要人们引起重视,并提早采取有效的预防和应对措施

第一章 恢复生态学的概念与原理 第二章 生态恢复的方法与应用 第三章 退化生态系统的生态恢复 第四章 生态恢复的生态工程技术

● 井身结构设计 ● 套管柱强度设计 ● 注水泥工艺技术 ● 钻开生产层技术 ● 完井方法及井底结构

第一节 井眼轨迹的基本概念 第二节 轨迹测量及计算 第三节 直井防斜技术 第四节 定向井轨道设计 第五节 定向井造斜工具及轨迹控制 第六节 水平井钻井技术简介

第一节 钻头 钻头的分类及工作原理 钻头的选型及分类方法 钻头的合理使用 第二节 钻柱 钻柱的组成及功用 钻柱的工作状态及受力分析 钻柱设计

Ship motions Ship motions are defined by the movements from the equilibrium position of the ship's centre of gravity along the three axes shown in Figure and by rotations about axes approximately parallel to these. The linear displacements along the horizontal

The power required to propel a new ship is subject to a formidable number of variable items. The family tree of power for propulsion (Fig. 1) shows these divided into two main groups. One is concerned with the resistance to motion caused by the interaction of the hull of the ship with the surrounding water

The outside surface of a ship is the surface of a solid with curvature in two directions. The curves which express this surface are not in general given by mathematical expressions, although attempts have been made from time to time to express the surface mathematically. It is necessary

The design of a ship involves a selection of the features of form, size, proportions, and other factors which are open to choice, in combination with those features which are imposed by circumstances beyond the control of the design naval architect. Each new ship should do some