1)  albedo

1.
At last, a nonlinear feedback hypothesis about albedo is put forward

2)  clear-sky planetary albedo

3)  planet

1.
Dynamic Test of Contact Tooth Pair Numbers of the N Type Involute Planetary Transmission with Minor Tooth Difference;
N型渐开线少齿差行星传动接触齿对数的动态实测
2.
Correlation between spin angular momentums and background angular momentums of planets;

3.
Proving Keippler s 3 Laws of Planetary Motion;

4)  Planets

1.
By means of the Runge -Lenz s vector the problems of the planets motion around the sun are solved in classical and relativistic cases.

5)  planetary

1.
The whole field of planetary gear transmission is dealt -with.
(?)里基本上涉及了渐开线行星齿轮传动的整个领域。
2.
The efficiency of planetary gear trains is discussed.

6)  planetary gear transmission

1.
Comparing many types of transmission,this paper chooses the multiple-level planetary gear transmission to meet the transmission ratio conditions.

2.
The relation between the radial deformation of the central internal gear in planetary gear transmission and the number of planet gears is derived in this paper.

3.
In this paper, the main constraints for the designing of NN type of involute planetary gear transmission are discussed, a concise and practical method for determining the addendum modification coefficients is proposed and some appropriate parameters are provided.

 反照率albedo   表示物体反射光的能力的物理量。常用符号A表示，可定义为反射光与入射光的强度之比，显然A＜1。研究行星的反照率可以提供有关它们表面的化学组成和物理状况等信息，对于小行星、卫星，还可据此来推算它们的大小、形状等。在实际运用中，尚有多种略有差别的反照率，如几何反照率、平面反照率、邦德反照率等。而且，同一物体的A值与测定它的波长有关。九大行星中，水星的A最小（0.06），金星最大（0.76），地球居中（0.39）。