查询词典 fin-footed

Particularly, the swimming velocity and thrust generated by undulatory motion of the developed robotic fin are analyzed theoretically. Furthermore, a computational fluid dynamics method is used to show pressure distribution on robotic fin surface as well as the periodical change of generated swimming thrust with time.

重点推导了仿生鱼鳍波状运动时理论上能到达的推进速度和产生的推进力；并采用数值仿真给出了波动推进时仿生鱼鳍表面的压力分布以及推进力随时间的周期变化规律。

Body usually has black spots, caudal fin usually is unspotted, and adipose fin is not black bordered.

组织通常会有黑点、尾鳍通常是 unspotted，和脂肪翅不是黑色边。

The tail fin with two degrees of the robot-fish under the change of heavy load and the influence of characteristic of electromotor will make the distortion of transformation of speed and position synchronously, and bring on anisomerous flaping of the tail fin.

机器鱼多关节尾鳍受外界负载变化及伺服系统机械结构本身特性的影响会使速度和位置曲线失真，从而影响机器鱼的推进效率。

Then the lift and torque models of double wings fin stabilizers flapped lengthways and single wing fin stabilizers flapped breadthwise at zero speed are acquired on the basis of step by step degenerate derivation.

根据Weis-Fogh机构的组成和结构特点，论文提出了双翼纵向拍动型、单翼纵向拍动型和单翼横向拍动型三种类型的零航速减摇鳍。

The experimental result shows, Morpho butterfly's wing micro-structure forms the reflecting rate higher than the reflecting rate of other butterflies, so regard Morpho butterfly as and transfer to the micro-structure of printing, is observed by SEM and transfered to the vein micro-structure printed, demonstrate the same array scale as Morpho butterfly and carinate fin slice, small in more quantity than Morpho butterfly in the slight branch form structure, but metal micro-structure of color and luster printed off to transfer to raise reflect, it is it print off by AFM array carinate fin of alternate size nearly the width of 1.5μm to transfer to measure.

实验以高解析光学显微镜及紫外光/可见光光谱仪分析虎斑蝶、碧翠凤蝶、锯粉蝶、摩浮尔蝶蝶翼表面的光学反射、穿透与吸收特性，实验结果显示，转印的Morpho蝶翼微结构与真实摩浮尔蝶反射率较相近，故将Morpho蝶作为转印微结构，由SEM观察转印的翅脉微结构，呈现出与Morpho蝶相同的阵列鳞片与脊状的鳍片，虽细微的树枝状结构少，但转印出的微结构溅镀20nm的金属膜提高反射率，而由AFM检测转印出阵列脊状的鳍片间隔尺寸约为1.5μm的宽度。

Gymnarchus niloticus,propelled by undulations of a long-based dorsal fin,is a typical representative of median and/or paired fin fishes.

&尼罗河魔鬼&采用长背鳍波动推进方式，属于典型的奇鳍/对鳍推进鱼类。

Although the louvered fin geometry of heat exchanger had been proposed in 1950s, the flow and heat transfer characteristics of the louvered fin radiator weren't be analyzed and understood until 1970s.

虽然百叶窗翅片在50 年代就已经存在，但是仅仅在过去的二十年中，人们才开始通过各种手段去了解百叶窗翅片的流动现象和流动特性。

In order to study the geometry effect on the performance of the louvered fin heat exchanger, a two dimensional numerical model is established for air side heat transfer and fluid flow characteristics for a type of louvered fin surface and the related numerical simulation is conducted.

heat transfer and flow characteristics ； numerical simulation ；为研究百叶窗翅片几何结构对换热器性能的影响，采用二维计算模型，对空气流经一种类型的百叶窗翅片的传热和流动特性进行了数值模拟，获得了百叶窗翅片的温度场、速度场和流线图。

Colors below the posterior dorsal rags fin are identical and no black spots on them. The distance from anterior to posterior dorsal fin base (the distance between the two dorsal fins) was relatively short. The base of the two ventral fins united and concaved narrowly.

modestus的主要形态区别为：第1背鳍大而高，第1鳍棘呈丝状延长，各鳍棘尖明显伸出鳍膜；第2背鳍各鳍棘中部以下颜色均一，无黑斑；第1背鳍和第2背鳍基部之间间距较小；左右腹鳍基部愈合处凹陷较浅。

After analyzing the results, the best processing technique for UHP of degreased yellow-fin tuna is achieved, which is after 30 seconds of the pre-processing, holding it for 15min with the pressure of 350MPa. In this way, the preserving period of the processed degreased yellow-fin tuna is extended to 15 days under normal temperature.

对检测结果进行数学分析后，得到了超高压处理脱脂黄鱼的最优加工工艺，为预处理30s后加压到350MPa保压10min，使加工后的脱脂黄鱼在常温条件下的保质期达到了15天。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。