The unsymmetrical phenomenon of the wave form of dorsal fin undulation is discussed and a description is given on basis of parameterized formulation 分析了“鸳鸯炮弹”背臀鳍的相位关系,揭示了其稳态巡游时背臀鳍波动相位随时间变化的一致性和协同性。
2.
Typical estimation of kinematic parameters ( cruising speed , wave speed , wave length and frequency ) based on experimental data of the cruising specimens indicates there is significant correlation between cruising speed and other parameters 在实验观测的基础上,根据实验样本的形态及运动规律,建立了背鳍/背臀鳍波动推进模式的运动学方程。
3.
First , an experimental apparatus for undulatory dorsal / median fin propulsion modes is established . based on morphological and kinematic data of the body and the dorsal / median fins of specimens , the analysis shows that the slender body is well streamlined , symmetrical 本文的实验观测首先建立了背鳍/背臀鳍波动推进研究的生物实验装置,进行仿生对象形态学和运动学观测,提取了仿生对象的形态学和运动学特征。
4.
The measurements used are fork length , head length , upper jaw length , snout length , length of dorsal fin base and anal fin base and the distances from the tip of snout to insertion of dorsal fin , to pectoral fin , to ventral fin and to hard margin of preopercle 此所用于分析之外部非体节形质计有：尾叉长、头长、上颚长、吻长、眼径、背鳍基底长、臀鳍基底长以及吻端到前鳃盖骨后绿、背鳍起点、腹鳍起点、臀鳍起点等11个形质。
5.
The undulatory dorsal / median fin propulsion modes as represented by amiiform and balistiform fish are of great significance for bionic propulsion research , particularly for the design and control of underwater vehicles , which are generally employed at slow speeds , offering greater maneuverability and better propulsive efficiency 以弓鳍目和鳞?科鱼类为代表的背鳍/背臀鳍波动推进模式对于水下仿生推进器研制具有相当重要的参考价值。
6.
Finally , the values of kinematic parameters in typical swimming are estimated for theoretical calculation and computational simulation . based on the kinematic formulation , this paper applies large - amplitude elongated body theory to propulsive performance of undulatory dorsal / median fins and establishes a set of equations for estimation of the propulsive force and the propeller efficiency . the calculations based on experimental data coincide with blake ’ s result in 1980 从波动运动的参数方程出发,本文基于大摆幅伸长体理论对背鳍/背臀鳍波动模式的推进性能进行了分析,推导推进力和推进效率的计算公式,利用实验观测典型运动参数对仿生对象的推进力和推进效率进行了理论估算,结果与blake的计算结果相吻合,从而验证了所建运动学模型的有效性。
7.
The approaches used in the study included : observing the microstructure and ultrastructure of the cell line of colossoma brachypomum ( cbt ) and the cell line of carp ( cp ) stressed low temperatures under fluoroscopy and tem ; analysis of dna damage in the cultured cells under temperatures stress by dna gel electrophoresis 本研究采用的主要实验方法：通过荧光显微观察、电镜超微结构观察确定cbt (淡水白鲳臀鳍细胞)和cp (草鱼胚胎细胞)在低温处理后的显微与超微结构的变化。应用dna电泳分析细胞dna在低温处理后的断裂现象。
8.
Based on bionic experiments in gymnarchus niloticus and rhinecantbus aculeatus , this paper presents a parameterized description of undulatory dorsal / median fin propulsion modes . by referring to large - amplitude elongated body theory and computational fluid dynamics simulation , this paper also provides an explanation of the external morphological and kinematic phenomena that are closely related to propulsion characteristics 本文以“尼罗河魔鬼”和“鸳鸯炮弹”为仿生实验对象,建立背鳍/背臀鳍波动推进模式的参数化描述,对与推进性能密切相关的若干形态学及运动学特征进行研究。
