声波导

This method is based on the Snell law of acoustic propagation in water. Different velocity gradients among linear layers in water are utilized to draw the sound ray chart, and a mathematical model of the geometric operational range is built. Furthermore, the geometric homing range is predicted with sound ray density, a prediction system of geometric operational range for acoustic homing torpedo is designed and the function of the system is realized through a system software. The sea trial demonstrates the prediction validity of the system.

该方法基于声波在水中传播的Snell定律，利用水中各线性分层间不同的声速梯度，绘制声线图，建立了几何自导作用距离的数学模型，并通过声线密度对几何作用距离进行预报，设计了声自导鱼雷几何作用距离预报系统，并通过系统软件实现了其功能，经测试，该系统在海上试验中取得了良好效果。

In this case, the geoacoustic waves satisfying the constructive interference prefer entially propagate along the confined aquifer, and the most energy of waves is trapped within the confined aquifer waveguide.

此时，满足相长干涉的地声波将择优沿着承压含水层传播，声波的大部分能量被捕获在承压含水层波导内。

Firstly, general mechanical displacement and a dispersion equation are derived by solving elastic field equations with continuity boundary condition.

本文推导了双层声波导结构乐甫波传感器的频散方程和质量敏感度。

This article analyzes the phase diagram of 4 He and λ phase transition of liquid 4 He. Discusses the sorts of the phase transition with vavious temperature and pressure. Indicates the fundamental cause about liquid 4 He named after quantum liquid.

分析了4He的相图和液体4He的λ相变，讨论了在不同的温度和压强下相变的类型，指出了液体4He被称为量子液体的基本原因，介绍了HeⅠ的基本特性，如粘滞系数、热导率，对声波的吸收系数，以及凝聚气体模型。

What are your goals and strategies for growth?

你的成长目标和策略是什么？

And unto the angel of the church in Sardis write; These things saith he that hath the seven irits of God, and the seven star I know thy works, that thou hast a name that thou livest, and art dead.

3：1 你要写信给撒狄教会的使者，说，那有神的七灵和七星的，说，我知道你的行为，按名你是活的，其实是死的。