rarefaction

简明释义

英[ˌreərɪˈfækʃ(ə)n]美[ˌrerɪˈfækʃn]

n. [声] 稀疏；（气体）稀薄

英英释义

单词用法

同义词

反义词

例句

1.He believed that the changes things undergo could be explained in terms of rarefaction and condensation of air.

他相信物质的改变可以被解释为一系列的气体的稀释和浓缩。

2.This paper is concerned with the decay rates of the solution to the strong planar rarefaction waves for scalar conservation laws with degenerate viscosity in several space dimensions.

本文主要研究高维空间中带有退化粘性的标量守恒律方程的光滑解的整体存在性，以及该解逼近强平面稀疏波的衰减率。

3.Rarefaction effect on supersonic flow fields in the transition from near continuum to near free-molecule flow is analyzed numerically.

从近连续流到近自由分子流，计算分析超声速流场的稀薄效应。

4.Objective: For observation and treatment of diabetes followed by rarefaction of bone.

目的：观察和治疗糖尿病伴随骨质疏松。

5.The result indicated that the retinal pigment epithelium cytoplasmic rarefaction or condensation, rounded abnormalities of basal infoldings were present.

结果表明，视网膜色素上皮有胞浆结构不均，基底膜皱折变圆不规则。

6.After discussing the conditions under which this approximation could be used, it is applied to study various 1-dimensional flows: continuous flows, rarefaction, compression waves and shock waves.

在讨论了这种近似的适用条件后，分别用它就一维流的情况研究了连续流、稀疏波和压缩波以及激波等运动形态。

7.Yanqing County forms an orderly urban layout combining rarefaction and density and the garden city scene with both mountain and water and distinctive characteristics.

延庆县城形成了错落有致、疏密结合的城市布局和山水相间、特色鲜明的园林城市风貌。

8.In the second part of Chapter 2 we give a new measure about the rarefaction waves, and a sharp decay estimate of the new measure is established for the cubic nonlinear system of conservation laws.

在第二部分，我们给出一个新的关于稀疏波的测度，而且给出了三阶非线性双曲守恒律关于这个测度的精确估计。

9.In the second part of Chapter 2 we give a new measure about the rarefaction waves, and a sharp decay estimate of the new measure is established for the cubic nonlinear system of conservation laws.

在第二部分，我们给出一个新的关于稀疏波的测度，而且给出了三阶非线性双曲守恒律关于这个测度的精确估计。

10.The sound waves travel faster in a medium where there is less rarefaction.

在稀薄度较低的介质中，声波传播得更快，其中的稀疏现象较少。

11.During the rarefaction phase of a wave, the particles are further apart from each other.

在波的稀疏阶段，粒子彼此之间的距离更远。

12.In the atmosphere, rarefaction occurs at high altitudes where air pressure is lower.

在大气中，稀疏现象发生在高海拔地区，那里的气压较低。

13.The scientist explained how rarefaction affects sound propagation in different environments.

科学家解释了稀疏现象如何影响声音在不同环境中的传播。

14.As the balloon expands, it creates areas of rarefaction within the air.

当气球膨胀时，它在空气中产生了稀疏现象区域。

作文

In the study of physics, particularly in the field of acoustics and wave mechanics, the concept of rarefaction plays a crucial role in understanding how sound waves propagate through different mediums. To grasp the significance of rarefaction, one must first comprehend the behavior of waves. When a sound wave travels, it creates regions of compression and rarefaction. The areas of compression are where the particles of the medium are pushed together, while the areas of rarefaction are where the particles are spread apart, resulting in lower pressure. This alternating pattern is essential for the transmission of sound, as it allows the wave to move through the air or any other medium. The term rarefaction originates from the Latin word 'rarefacere', which means 'to make rare'. In practical terms, when we speak or produce any sound, our vocal cords create vibrations that disturb the surrounding air molecules. These disturbances lead to the formation of compressions and rarefaction in the air. As the sound wave travels away from the source, it continues to create these alternating regions, which can be visualized as a series of peaks and troughs. Understanding rarefaction is not only important in physics but also has real-world applications. For instance, in designing concert halls or auditoriums, acousticians must consider how sound waves will behave in the space. They need to ensure that the sound produced reaches all corners of the room without significant loss of quality. If the design fails to account for the effects of rarefaction, certain areas may experience echoes or dead spots where the sound is either too loud or too soft due to improper wave propagation. Moreover, the phenomenon of rarefaction is also crucial in the field of meteorology. When studying atmospheric pressure and weather patterns, meteorologists observe how rarefaction can lead to changes in wind speed and direction. For example, during the formation of a low-pressure system, the air becomes less dense, resulting in rarefaction. This process can influence storm development and precipitation patterns, making it vital for accurate weather forecasting. In summary, the concept of rarefaction is fundamental in understanding various scientific phenomena, particularly in acoustics and meteorology. It illustrates how sound waves interact with their environment and how these interactions can have practical implications in our daily lives. By recognizing the importance of rarefaction, we can appreciate the complexities of sound and weather systems, leading to better designs in architecture and more accurate predictions in meteorology. Ultimately, the study of rarefaction enhances our comprehension of the world around us, allowing us to harness these principles for technological advancements and improved quality of life.

在物理学的研究中，特别是在声学和波动力学领域，rarefaction（稀疏）这一概念在理解声波如何通过不同介质传播方面起着至关重要的作用。要掌握rarefaction的重要性，首先必须理解波的行为。当声波传播时，它会产生压缩区和rarefaction区。压缩区是介质中的粒子被挤压在一起的地方，而rarefaction区则是粒子分散开来的地方，导致压力降低。这种交替模式对于声音的传播至关重要，因为它允许波在空气或任何其他介质中移动。 “rarefaction”一词源于拉丁语“rarefacere”，意为“使稀疏”。在实际意义上，当我们说话或产生任何声音时，我们的声带产生的振动会扰动周围的空气分子。这些扰动导致压缩和rarefaction的形成。当声波从源头传播时，它继续产生这些交替的区域，可以想象成一系列的峰和谷。 理解rarefaction不仅在物理学中重要，而且具有现实世界的应用。例如，在设计音乐厅或礼堂时，声学家必须考虑声波在空间中的行为。他们需要确保产生的声音能够到达房间的每个角落，而不会显著失去质量。如果设计未能考虑rarefaction的影响，某些区域可能会出现回声或死点，声音要么太大，要么太小，导致波传播不当。 此外，rarefaction现象在气象学领域也至关重要。在研究大气压力和天气模式时，气象学家观察到rarefaction如何导致风速和方向的变化。例如，在低压系统形成期间，空气变得不那么密集，导致rarefaction。这一过程可以影响风暴的发展和降水模式，使其对准确的天气预报至关重要。 总之，rarefaction的概念在理解各种科学现象，特别是声学和气象学方面是基础性的。它说明了声波如何与环境相互作用，以及这些相互作用如何在我们的日常生活中产生实际影响。通过认识到rarefaction的重要性，我们可以欣赏声音和天气系统的复杂性，从而在建筑设计和气象预测中取得更好的成果。最终，rarefaction的研究增强了我们对周围世界的理解，使我们能够利用这些原理推动技术进步，提高生活质量。