在水下

Sub-volcanic rocks include andesitic porphyrite, rhylitic porphyry, cryptoexplosive breccia as well as autobreccia etc.(2) Volcanic lithofacies——through the observation of cores, identification of thin sections and interpretation of well logs and seismic data, there are 8 kinds of lithofacies for the volcanic rocks of Yingcheng Formation are identified: fallout facies, effusion facies, pyroclastic flow facies, base surges facies, lahar facies, eruption-sedimentary facies, subvolcanic facies and extrusion facies.(3) Three types of eruption——i. e. explosion, effusion and surge.(4) Two kinds of eruptive environments——Subaerial (e. g. volcano in Well Shangshen 3) and subaqueous .(5) Three remarkable volcanic apparatus in Shengping-Wangjiatun area——layered, micro-shield and cone volcanoes according to volcanic processes and lithofacies distribution.

次火山岩有安山玢岩、流纹斑岩、隐爆角砾岩及自碎角砾岩等；(2)火山岩相——通过岩芯观察、镜下鉴定、测井与地震资料解释，营城组火山岩中发育8种岩相类型，即爆发空落相、溢流相、火山碎屑流、基底涌流相、喷发沉积相、火山泥石流相、侵出相和次火山相等；(3)火山喷发的形式——有爆发、溢流和涌流三种；(4)火山喷发环境——有陆上(如尚深3井火山)和水下两种；(5)火山机构类型——根据火山作用特点和岩相分布特征，在升平—汪家屯地区识别出三类截然不同的火山机构，即层火山、微型盾火山和渣锥火山。

Supported by the National Natural Science Foundation, this dissertation mainly deals with bionics study on Thunniform swimmer, theoretical kinematics modeling and computer simulations, analyzes effects of elastic elements on propulsion efficiency, and experimentally studies a new type of underwater propulsor.

本文以国家自然科学基金项目"仿鱼鳍水下推进器的理论与实验研究"为背景，集中对鲹科加新月形尾鳍推进模式鱼类游动的仿生学研究、仿鱼水下推进器运动学建模与仿真、弹性组织在提高推进效率中的应用、及其相关的新型仿鱼水下推进器等方面进行理论与实验研究。

Firstly, this dissertation carries out bionic research on the motion of fish body and caudal fin of Thunmiform swimmers in one-dimensional steady swimming for the purpose of establishing kinematic model of underwater propulsor of Thunmiform. This paper also presents the kinematic parameters which describe the motion of fish body and caudal fin, the fundamental approach to getting the propulsion force and the factors related to the propulsion force and efficiency.

首先，从建立仿鲹科加新月形尾鳍推进模式水下推进器运动学模型的目的出发，对采用鲹科加新月形尾鳍推进模式的鱼类在一维稳态游动情况下的身体以及尾鳍的运动进行了仿生学研究，研究了推进运动的基本特征，给出了身体及尾鳍的运动状态、描述其运动的运动学参数、推进力产生的基本途径以及与推进力和推进效率有关的因素，从而为仿鱼水下推进器运动学建模与仿真提供了仿生学基础。

Some contrastive experiments were carried out to study the difference between the two-joint robotic fish and a one-joint oscillating caudal fin propulsor, which says that the rear passive joint is essential to the reduction of drag period in the whole propulsion cycle.

实验结果表明该两关节仿鱼水下推进器比单关节尾鳍摆动式水下推进器在相同实验条件下具有更高的推进速度。

You want to be balanced front to back before you start your first pulldown.

在开始第一次水下划水之前让身体前后保持平衡。

The imaging quality of this lens was evaluated. The results show that it has an excellent imaging quality, at spatial frequency of 42lp/mm, its MTF value is greater than 0.5 for 0.7ω, and it meets all the specifications and requirements of WFOV and large relative aperture for underwater photographic application.

质量评价结果表明：设计的摄影物镜成像质量优异，在空间频率为42lp/mm时0.7ω的MTF值高于0.5，且达到各项性能指标，能够满足水下微光摄影物镜对大视场大相对孔径的需求。

Hadfield is on the sea floor inside the Aquarius underwater habitat's 122 square meters of living and working space.

哈德菲尔德是在里面的水瓶座水下栖息地的生活和工作的122平方米海底。

Aimed at the use of underwater active detection system, an analog pretreatment circuit is designed. More than one amplifier and two filters are used to process the signal. The signal can be amplified and self-excitation is avoided. The series of AD867X are used to restrain the circuit noise.

针对水下主动探测系统的应用，设计了一种模拟预处理机，该电路采用分级放大结构，并使用两级滤波器对信号进行滤波处理，在达到对信号放大倍数要求的同时避免了放大器自激，采用噪声性能好的AD867X系列芯片有效抑制了电路噪声对信号的影响。

As an important technology of computer vision, image mosaic is widely used in the image analysis examination under the water self-motion map movement analysis etc.

图像匹配作为计算机视觉中的一门重要技术，它在遥感图像分析、水下检查、立体视觉、自动地图、运动分析等领域都有广泛的应用。

You can see her underwater, in the shallow pool of water and in the sand.

你可以看到她的水下，在浅水池的水和沙子。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐