查询词典 astronomical photometry

As the astronomical constants between ephemeris calculations, determine the astronomical almanac astronomical constants is also an important part.

由于天文常数关系历表计算，所以确定天文常数也是历书天文学的重要内容。

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。

General experiment situation on routine photometry and fluoro photometry of samarium for 10a recently is reviewed.

根据查阅到的文献，综述了近十多年来钐的常规光度法和荧光光度法研究进展。

Astronomical Photometry is a technique of measuring the amount of light emitted by a celestial object.

天文光度分析学是量度天体光度的一门技巧。

Astronomical Photometry is a technique of measuring the flux of a celestial object.

光度分析学是天文学上量度天体光度的技巧。

And the adoption of several well-known astronomical telescope and the focus on to describe the various astronomical telescopes and the development of advanced technologies.

并通过对国内外几个著名天文望远镜的重点介绍来说明天文望远镜的各种先进技术以及发展焦点。

This summary will be adopted for the classification of astronomical telescope introduced to enable us to understand the history of the development of astronomical telescope,status and trends.

celestial radiation ；本文将通过对天文望远镜的分类的介绍，使大家了解各种天文望远镜的发展历史，现状和发展趋势。

ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence.

ESO是欧洲各伙伴共有的革命性天文台，其中的ALMA是当今最大的射电望远镜项目。

ESO is the Europeanpartner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence.

ESO是欧洲各伙伴共有的革命性天文台，其中的ALMA是当今最大的射电望远镜项目。

In 1976, the International Astronomical Union revised the definition of the AU for greater precision, defining it as that length for which the Gaussian gravitational constant takes the value 0.01720209895 when the units of measurement are the astronomical units of length, mass and time.

但实际上地球绕日的轨道不是一个圆形，而是一个椭圆形：最初天文单位的定义就是上述椭圆的半长轴的长度。1976年，国际天文学联会把一天文单位定义为一颗质量可忽略、公转轨道不受干扰而且公转周期为365.2568983日的粒子与一个质量相等约一个太阳的物体的距离。

The witness also told the jury at the Royal Courts of Justice in London that he saw a paparazzo fighting with a member of the public who was trying to stop him taking pictures in the minutes before the emergency services arrived.

他还告诉在伦敦皇家法庭的陪审团，在急救服务到来之前，他当时看见一个狗仔队正和一群阻止他拍照的人打架。

The entire N／C program on a tape is made up of an accumulation of these successive data blocks.

纸带上的整个数控程序由这些连续数据单元连接而成。