查询词典 astronomical phenomena

Zhang Heng also made the first water-driven celestial globe in the world to measure the position of celestial bodies, which was carved with known important astronomical phenomena.

张衡还制造出了世界上第一架测量天体位置的水运浑天仪，凡是已知的重要天文现象，都刻在这架仪器上。

Beside, he invents the world's first automatic astronomical apparatus _ a water-powered celestial globe and makes the seismographs for detecting directions of the earthquake and observing meteorological phenomena. According to legends, he also makes other instruments such as compass cart and mileage cart.

创造了世界上第一架自动的天文仪器——流水转动的浑天仪，创造了测定地震方向的地动仪和观测气象的候风仪，还制造了当时只有在传说中有过的指南车和记里鼓车等。

If the establishment of celestial ephemeris, almanac forecast of certain astronomical phenomena, as the content of astronomy, it is a very old subjects.

如果把编制天体历表，预报某些天象作为历书天文学的内容，它是一个很古老的学科。

The Chinese precis writer the ancient times to astronomical phenomena is very detailed.

古人制定了许多历法，进行了多次改良，达到了十分精湛的水准。

The astronomy was in progress to the modernist in the ancient times to the astronomical phenomena precis writer studies China having important.

中国古代对天象的记录对现代人进行天文研究有重要的参考价值。

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

He developed an armillary sphere, on which were carved all the astronomical phenomena known at that time.

张衡认为地震是一种自然灾害，他根据自己对于地震现象的观测，在公元132年发明了&候风地动仪&，这台仪器成为世界上第一台观测地震方向的仪器。

He developed an armillary sphere, on which were carved all the astronomical phenomena known at that time.

张衡认为地震是一种自然灾害，他根据自己对于地震现象的观测，在西元132年发明了『候风地动仪』，这台仪器成为世界上第一台观测地震方向的仪器。

An actor claims be apt to watchs astronomical phenomena, simply is illuminated with armillary sphere, can see is which star descend to the world, but say again:"With armillary sphere inconvenience, usable also big copper cash will replace."

有个演员自称善观天象，只须用浑天仪一照，就能看出谁是哪颗星下凡，但又说：&用浑天仪不方便，也可用大铜钱来代替。&

Einstein, in 1916, with his general theory of relativity had explained or predicted three astronomical phenomena.

爱因斯坦于1916年用他的广义相对论解释或者预言了三个天文现象。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。