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The results indicate that a special overflow dam monolith can be considered to be safe in case of considering the three dimensional effect.


We should point out that the above procedure does not capture all the three dimensional effect of the Euler equations.


When an object is composed of threedimensional elements, intensity depth cueing may be applied to enhance the threedimensional effect.


The flow conditions on the blade element of a rotor are generally differ ent from a wing and a propeller with regard to threedimensional effect.


This is a three dimensional effect and can not be accounted for in the current plane strain model.

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 In this paper the quasisteady lifting line method is used to calculate the dynamic characteristics of propeller operating in the nonuniform wake of the ship hull, taking into account both the viscous and the three dimensional effects. A method based on constructing an equivalent twodimensional hydrofoil for the blade section is suggested to estimate the pressure distribution along the chord. The calculation results of propeller characteristics and pressure distribution along the section chord... In this paper the quasisteady lifting line method is used to calculate the dynamic characteristics of propeller operating in the nonuniform wake of the ship hull, taking into account both the viscous and the three dimensional effects. A method based on constructing an equivalent twodimensional hydrofoil for the blade section is suggested to estimate the pressure distribution along the chord. The calculation results of propeller characteristics and pressure distribution along the section chord show good ageement with experiments. The computer program for above mentioned purpose can be provided to the primary ship design.  本文用准定常升力线理论方法计算船舶螺旋桨在船后运转特性．计算中考虑了升 力面影响及粘性对零升力角、升力曲线斜率的修正。用本文所提供的程序对Ｂ系列， ＭＡＵ系列桨敞水性征曲线进行了计算，其结果与试验值吻合甚好。  A microcomputer graphics system for threedimensional reconstructon is escribed. By means of this system, the technique of threedimensional reconstruction from serial secton data of biological structure has been developed.As an example of its application, anosseous labyrinth of the finless black porpoise (Neophocaena asiaeorientalis) was reconstructed from its sections.The resulting image is shaded for giving the display a true threedimensional effect.It can be displayed... A microcomputer graphics system for threedimensional reconstructon is escribed. By means of this system, the technique of threedimensional reconstruction from serial secton data of biological structure has been developed.As an example of its application, anosseous labyrinth of the finless black porpoise (Neophocaena asiaeorientalis) was reconstructed from its sections.The resulting image is shaded for giving the display a true threedimensional effect.It can be displayed and rotated on a color monitor to view all its surfaces.The shaded image can also be printed out by a printer on which we heve deueloped asoftwarefor printing image.  在自己组装的微型机图象系统上,实现了对生物组织连续切片的三维重建。重建结果以灰度阴影方式在彩色显示器上显示,并可在打印机上以多灰度等级方式打印输出。结合一例江豚内耳的连续切片,对其耳蜗骨迷路部份进行了三维重建。并将重建结果以动态形式在显示器上转动,以便观察其各个侧面的情况。  The interaction between moving bodies and fluids, a classical problem of fluid dynamics, is reexamined from the viewpoint of vorticity dynamics. In this way, we may gain some new insight into the mechanism of the interaction and can be led to a series of results which are of practical value. The present paper studies the action of a moving surface to vorticity field and gives a general incompressible theory of the generation of vorticity at the surface and its dissipation in the fluid. It is found that there... The interaction between moving bodies and fluids, a classical problem of fluid dynamics, is reexamined from the viewpoint of vorticity dynamics. In this way, we may gain some new insight into the mechanism of the interaction and can be led to a series of results which are of practical value. The present paper studies the action of a moving surface to vorticity field and gives a general incompressible theory of the generation of vorticity at the surface and its dissipation in the fluid. It is found that there are two types of vorticity sources, the global one depends only on the acceleration property of the surface geometry, while the local one exists in both accelerated and uniform motion, consisting of tangential sources from pressure gradient and a threedimensional effect of the surface curvature, and a normal source due to the divergence of the twodimensional vorticity on the surface.  用涡量动力学的观点重新考察运动物体与流体的相互作用,会对流体动力学这个古老的基本问题的机理获得更加深入的认识。本文研究物体对涡量场的作用,对不可压流体给出了涡量在物面产生及其在流体内部耗散的一般理论,揭示出物面上存在整体的和局部的两类涡量源,分析了每种源的作用。   << 更多相关文摘 
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