precession

简明释义

英[prɪˈseʃən]美[prɪˈseʃən]

n. 先行，优先；进动，旋进；岁差

英英释义

单词用法

同义词

反义词

例句

1.The working principles of a Proton Precession Magnetometer G856 are introduced.

介绍了G856质子旋进磁力仪的工作原理。

2.This gyroscopic motion is called precession.

此陀螺运动叫做进动。

3.Therefore, the theoretical definition of CIP and its dynamical equation on polar motion and precession-nutation have been given.

由此对CIP轴进行了理论定义，并给出了其极移、岁差和章动的动力学方程。

4.There is a third movement the hypothesis covers called precession.

这个假说所包括的第三种运动叫做岁差。

5.I can show you the precession in another way which is, in fact, very intriguing.

我用另一种方法展示旋进，事实上，很有趣的。

6.There are two kinds of vortex type oscillatory flowmeter: vortex flowmeter and vortex precession flowmeter.

基于旋涡流体振荡原理的流量计主要有两种：涡街流量计和旋进旋涡流量计。

7.The theory of relativity also includes some more esoteric details, one of which is called spin precession.

相对论还包括一些更加深奥的细节，其中的一个被称作自转进动。

8.The precession frequency goes up.

旋进的频率上升了。

9.In physics, precession 进动 refers to the change in the orientation of the rotational axis of a rotating body.

在物理学中，进动指的是旋转物体旋转轴方向的变化。

10.The precession 岁差 of the equinoxes affects the timing of seasonal changes on Earth.

春分点的岁差影响地球上季节变化的时间。

11.The gyroscope's precession 进动 allows it to maintain its orientation in space.

陀螺仪的进动使其能够保持在空间中的方向。

12.Astronomers study the precession 岁差 of stars to understand the dynamics of the galaxy.

天文学家研究恒星的岁差以了解银河系的动态。

13.The Earth's axial tilt causes a slow precession 岁差 of its rotation axis over thousands of years.

地球的轴倾角导致其旋转轴在数千年内缓慢岁差。

作文

The concept of precession is a fascinating phenomenon that occurs in various fields of science, particularly in astronomy and physics. To understand precession, we must first look at its definition. In simple terms, precession refers to the gradual change or movement in the orientation of an astronomical body's rotational axis. This is not just a theoretical idea; it has real-world implications and applications that can be observed in our universe.One of the most well-known examples of precession is the wobble of the Earth’s axis, which causes the position of the stars to shift over time. This effect is primarily due to gravitational forces exerted by the Sun and the Moon on the Earth's equatorial bulge. As the Earth rotates, this gravitational pull causes the axis to trace a circular path over a period of approximately 26,000 years. This phenomenon is known as the precession of the equinoxes, and it results in the slow shift of the position of the celestial poles and the equinoxes.The implications of precession are significant for astronomers. It affects the way we observe and map the night sky. For example, the North Star, Polaris, is currently located near the North Celestial Pole, but due to precession, this will not always be the case. In about 12,000 years, the star Vega will take its place as the North Star. Understanding precession helps astronomers make accurate predictions about the positions of stars and constellations in the future.In addition to astronomy, precession can also be observed in the field of physics, particularly in gyroscopic motion. A gyroscope is a device that uses the principles of precession to maintain its orientation. When a force is applied to a spinning gyroscope, it does not simply tip over; instead, it moves at a right angle to the direction of the applied force, demonstrating the principles of precession. This property is utilized in various technologies, including navigation systems in aircraft and spacecraft.Furthermore, precession has applications beyond just astronomy and physics. In engineering and robotics, understanding the dynamics of precession can lead to more stable designs for moving parts. For instance, when designing rotating machinery, engineers must account for precession to prevent unwanted vibrations and ensure smooth operation.In conclusion, precession is a multifaceted concept that plays a crucial role in our understanding of the universe. From the shifting positions of stars to the functioning of gyroscopes, the effects of precession are far-reaching. By studying precession, scientists and engineers can enhance their knowledge and improve technologies that rely on these fundamental principles. As we continue to explore the cosmos and innovate in technology, the importance of precession will undoubtedly remain a key area of interest and research for years to come.

“进动”这一概念是一个迷人的现象，发生在科学的各个领域，尤其是在天文学和物理学中。要理解“进动”，我们首先必须了解它的定义。简单来说，“进动”指的是天体旋转轴方向的渐变或移动。这不仅仅是一个理论概念；它具有现实世界的意义和应用，可以在我们的宇宙中观察到。“进动”的一个最著名的例子是地球轴的摆动，这导致恒星的位置随着时间的推移而变化。这种效应主要是由于太阳和月球对地球赤道隆起施加的引力。当地球自转时，这种引力使得地轴沿着一个圆形路径运动，周期大约为26000年。这种现象被称为春分点的进动，它导致天极和春分点的位置缓慢变化。“进动”的影响对天文学家来说是重要的。它影响我们观察和绘制夜空的方式。例如，目前北极星位于北天极附近，但由于“进动”，这并不会一直如此。大约在12000年后，星星织女星将取代北极星。理解“进动”有助于天文学家准确预测未来星星和星座的位置。除了天文学，“进动”也可以在物理学领域观察到，特别是在陀螺运动中。陀螺仪是一种利用“进动”原理来维持其方向的装置。当施加力量于旋转的陀螺仪时，它不会简单地倾倒；相反，它会以与施加力量的方向垂直的方式移动，展示出“进动”的原理。这个特性被用于各种技术中，包括飞机和航天器的导航系统。此外，“进动”在工程和机器人领域也有应用。理解“进动”的动态可以导致更稳定的运动部件设计。例如，在设计旋转机械时，工程师必须考虑“进动”，以防止不必要的振动并确保平稳运行。总之，“进动”是一个多面向的概念，在我们理解宇宙方面发挥着至关重要的作用。从恒星位置的变化到陀螺仪的功能，“进动”的影响范围广泛。通过研究“进动”，科学家和工程师可以增强他们的知识，并改善依赖这些基本原理的技术。随着我们继续探索宇宙和在技术上创新，“进动”的重要性无疑将继续成为未来几年研究和关注的关键领域。