Since the value of the spin angularmomentum of a celestial body has positive relationship with the value of its background angular momentum, the author suggests that the angular momentum is probably of more deep physical meaning and tries to explain some astronomical phenomena and laws from new points of view such as the mass distribution of the Galaxy, the spin motion of the nine major planets of the solar system, the extraordinary behavior of the spin motion of some planets, and so on.

In general, the ambiguity in the phase shift analysis corresponds to the motion of spin which conserves the components of spin-tensors in the direction of momentum, and the parameters which characterize those general spin motion take the fixed values.

Rumyyantsev derived the stability condition of the spin motion of rigid body with cavities partially filled with liquid around a fixed point, that is Iz>Ix+Iq.

Since the spin motion arised from torsion is coordinate dependent, which influences the change of magnetic field of Neutron star. The calculating conchtsions are:the magnetic field of pulsars inclines to its rotating direct- ion at the age of 10~6-10~7yr.

The quantum-mechanical equation is obtained for the spin motion in the Foldy-Wouthuysen representation; it is consistent with the classical Bargmann-Michel-Telegdi equation.

The quantum-mechanical and semiclassical equations of spin motion are derived.

A solution of the equation of spin motion (the Bargmann-Michel-Telegdi equation) for the case of motion of a magnetic top in a constant uniform electromagnetic field is derived with the help of the algorithm constructed.

This study investigates observed interactions between second-order optical biharmonics with difference frequencies characteristic of intra-molecular spin motion.

In conclusion we present spin motion equations for a particle with electric and magnetic charges.

Starting from the conditions which should be satisfied by the existence of different choice in the phase shift analysis, in this paper the general ambiguity in the analysis of elastic scattering of particles with arbitrary spins has been discussed. The transformation matrices among the different sets of phase shift are given, the real parameters involved are determined by the system of second order algebraic equations. The problem of ambiguity in the phase shift analysis therefore is reduced to the problem of...

Starting from the conditions which should be satisfied by the existence of different choice in the phase shift analysis, in this paper the general ambiguity in the analysis of elastic scattering of particles with arbitrary spins has been discussed. The transformation matrices among the different sets of phase shift are given, the real parameters involved are determined by the system of second order algebraic equations. The problem of ambiguity in the phase shift analysis therefore is reduced to the problem of finding the teal roots of those equations. The number of different sets of real roots is twice that of different phase shift choice. Therefore, the kinematical ambiguity in the phase shift analysis in general is solved. When the channel spin is 1/2, it has been shown that only two sets of phase shift exist; when the channel spin is 1, only two sets of phase shift are given also, therefore it has been shown that the Minami's ambiguity is the whole ambiguity in these cases. When the channel spin is 3/2, it has been found that there are four different sets of phase shift. Therefore, in addition to the known transformation there are two new transformation matrices in that case. In general, the ambiguity in the phase shift analysis corresponds to the motion of spin which conserves the components of spin-tensors in the direction of momentum, and the parameters which characterize those general spin motion take the fixed values. In our discussion it has been shown that the systems of algebraic equations which are satisfied by the real parameters in the transformation matrices in the whole integral spin cases are quite different from that in the half integral spin cases. Therefore, the numbers of real roots in those two cases are also different, this means that the numbers of different phase shift sets are quite different. From the properties of those algebraic equation it has been suggested that the ambiguity in the case of integer spin is much smaller than that in the case of half integer spin.

The Rattleback or Celt stone is a certain kind of an asymmetrical rigid body, which, if placed on a rough surface and caused to spin in a particular direction about a vertical axis, will quickly stop spinning and will then oscillate about a horizontal axis and start to spin-reverse. If the rattleback is caused to oscillate about a horizontal axis, then the oscillation will be quickly converted into a spinning motion about a vertical axis. In this paper a dynamical explanation of the strange...

The Rattleback or Celt stone is a certain kind of an asymmetrical rigid body, which, if placed on a rough surface and caused to spin in a particular direction about a vertical axis, will quickly stop spinning and will then oscillate about a horizontal axis and start to spin-reverse. If the rattleback is caused to oscillate about a horizontal axis, then the oscillation will be quickly converted into a spinning motion about a vertical axis. In this paper a dynamical explanation of the strange behavior of the rattleback is given and the results of analysis are confirmed by the experiments and the numerical calculations.

Rumyyantsev derived the stability condition of the spin motion of rigid body with cavities partially filled with liquid around a fixed point, that is Iz>Ix+Iq. This paper extends his method and derives the stability condition for the spin Spacecraft with Cavities partially filled with liquid, that is I2>Ix+I2. I1 and I2 are positive definite functions of the spacecraft parameters. Typical examples demonstrate that the difference between I1 and I2 could be significant for certain parameters. This...

Rumyyantsev derived the stability condition of the spin motion of rigid body with cavities partially filled with liquid around a fixed point, that is Iz>Ix+Iq. This paper extends his method and derives the stability condition for the spin Spacecraft with Cavities partially filled with liquid, that is I2>Ix+I2. I1 and I2 are positive definite functions of the spacecraft parameters. Typical examples demonstrate that the difference between I1 and I2 could be significant for certain parameters. This paper also presents a Steady State Solution of the Spin motion under the assumption that the cavities are positioned Symmetrically about the spin axis with slight errors. It is pointed out that the dynamic imbalance is amplified due to fluid migration between the cavities.The second part of this paper derives the general solution of Stability condition for three dilTerent types of communication between cavities. The influencs of pressed gas in the cazities on stability is taken into account for simple connected cavities.