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Numerical Simulation and Experimental Investigation on A Thermoacoustic Engine with Tapered Resonance Tube A symmetrical standing-wave thermoacoustic engine with tapered resonance tube has been numerically simulated with liner thermoacoustics. The simulation shows that using tapered resonance tube in thermoacoustic engine could decrease the velocity amplitude and lower the total acoustic power loss in the resonance tube. The experimental results indicate that the harmonic was suppressed effectively by using the tapered resonance tube, and the pressure ratio was improved.

采用锥形谐振管的热声发动机的数值模拟和实验研究利用线性热声理论，对一台采用锥形谐振管的驻波型热声发动机进行了数值模拟，发现采用锥形谐振管可有效降低工质气体的速度振幅，进而减小在谐振管中声功率的损失；与一台在相同频率下工作的采用等直径圆柱谐振管的驻波型热声发动机进行了实验对比，结果表明，在使用锥形管作为谐振管的热声发动机系统中，谐振管中的非线性效应得到了明显的抑制，热声发动机在基频模式下稳定运行，压比增大而加热温度降低。

At first, the kind of high-speed craft and its current situation are introduced in this paper. Through analyze and compare the characteristics of their performance, three kinds of high-speed craft are selected to be optimized. They are hydrofoil-gliding craft, wave-piercing catamaran and frigate, which power equipment of propulsion system are the common screw, pitch-adjustable screw and water-jet propeller.

本文首先介绍了高速船种类及其推进器的发展现状，通过分析比较各种船型的性能特点，选取了三种典型的高速船(翼滑艇、穿浪艇和护卫舰)并分别以普通螺旋桨、可调距螺旋桨和喷水推进器作为三种船型等动力装置。

Overload Beam: The ZOCOM Zone Shatterer can fire a second, powerful sonic wave at any time by drawing upon reserve power.

波束负载：ZOCOM区域震裂者只要可以使用备用电力，任何时候都可以发射一种非常强大的声波。

As a shipbuilder, Cockerell was trying to find a solution to the problem of the wave resistance which wastes a good deal of a surface ship's power and limits its speed.

作为一个船舶技师，科克雷尔在寻找解决波浪阻力的方法，因为波浪阻力浪费掉了船在水面行使的大量动力，从而限制了船的速度。

As a shipbuilder, Cockerell was trying to find a solution to the problem of the wave resistance which wastes a good deal of a surface ships power and limits its speed.

作为一个船舶技师，科克雷尔在寻找解决波浪阻力的方法，因为波浪阻力浪费掉了船在水面行驶的大量动力，从而限制了船的速度。

As a shipbuilder,Cockerell was trying to find a solution to the problem of the wave resistance which wastes a good deal of a surface ship's power and limits its speed.

作为一个船舶技师，Cockerell在寻找解决波浪阻力的方法，一位波浪阻力浪费掉了船在水面行驶的大量动力，从而限制了船的速度。

As a shipbuilder, Cockerell was trying find a solution the problem of the wave resistance which wastes a good deal of a surface ship's power and limits its speed.

作为一个船舶技师，科克雷尔在寻找解决波浪阻力的方法，因为波浪阻力浪费掉了船在水面行驶的大量动力，从而限制了船的速度。

Methods of improving the power density and weakening aberration rate of sine wave are research.

在上述工作的基础上，设计开发了额定功率分别为1.2kW和7.5kW的样机。

The power source of 60 Hz composed of the universal frequency converter and special sinusoidal electric wave filter and reactor may be used in submersible pump test within a certain range.

用普通变频器和专用正弦波滤波器、电抗器组成的60 Hz电源，在一定的范围内，可作为潜油电机的试验电源使用。

Under this direction, we developed a kind of inverter power supply, and the parameters are as follows:(1)the input of three-phase alternating current;(2)the output of sinusoidal wave;(3)the frequency of output: 5-25 kHz, which can be adjusted;(4)the voltage of output: 5-20 kV, which can be adjusted.

根据这个特点，我们研制了一种高频、高压的大功率逆变电源，参数如下：(1)三相交流输入；(2)输出正弦波；(3)输出频率：5～25kHz，可调；(4)输出电压5～20kV，可调。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。