We study the entanglement evolution in a weakly coupled bipartite system with a large energy level difference under the influence of spin-star environments. The subsystems can be coupled to a pure state or a thermal e...We study the entanglement evolution in a weakly coupled bipartite system with a large energy level difference under the influence of spin-star environments. The subsystems can be coupled to a pure state or a thermal equilibrium state spin-star environment. Our results show that, in the case of the coupling strength being less than the energy level difference of the subsystems （weakly coupled）, the spin-star environment can always be used to assist the entanglement generation of the bipartite system.展开更多
We study the dimensionless spin parameter j ≡ cJ/（GM2） of different kinds of uniformly rotating compact stars, including traditional neutron stars, hyperonic neutron stars and hybrid stars, based on relativistic me...We study the dimensionless spin parameter j ≡ cJ/（GM2） of different kinds of uniformly rotating compact stars, including traditional neutron stars, hyperonic neutron stars and hybrid stars, based on relativistic mean field theory and the MIT bag model. It is found that j ~ 0.7, which had been suggested in traditional neutron stars, is sustained for hyperonic neutron stars and hybrid stars with M 〉 0.5 MG. Not the interior but rather the crust structure of the stars is a key factor to determine jmax for three kinds of selected compact stars. Furthermore, a universal formula j = 0.63（f/fK） -- 0.42（f/fK）2 ＋ 0.48（f/fK）z is suggested to determine the spin parameter at any rotational frequency f smaller than the Keplerian frequency fK.展开更多
The angular acceleration due to the spin effect increases the burning rate of solid propellant and changes the motor performance by increasing the operating pressure and decreasing the burning time. So it is important...The angular acceleration due to the spin effect increases the burning rate of solid propellant and changes the motor performance by increasing the operating pressure and decreasing the burning time. So it is important to know the grain regression taken place in the solid propellant rocket motor in the acceleration field. This study represents the grain regression analysis of two-dimensional axis-symmetric star grain configuration of the solid propellant rocket motor with spin induced acceleration effect and pressure effect on burn rate using geometrical and numerical analysis. While the rocket is spinning, the burn rates on each point of the propellant surface are different with its radial distance, acceleration vector angle and surface slope. With the different burn rates on the propellant surface, we analyze the propellant surface perimeter and port area, and these results are compared with those of constant burn rate and burn rate affected by the chamber pressure.展开更多
This is the final article in our series dealing with the interplay of spin and gravity that leads to the generation, and continuation of celestial body motions in the universe. In our prior studies we focused on such ...This is the final article in our series dealing with the interplay of spin and gravity that leads to the generation, and continuation of celestial body motions in the universe. In our prior studies we focused on such interactions in the elementary particles, and in the celestial bodies in the solar system. Foremost among the findings was that, along with gravity, matter at all levels exhibits axial spin. We further noted that all freestanding bodies outside our solar system, including the largest such units, the stars and galaxies also spin on their axes. Also, the axial rotation speed of planets in our solar system has a linear positive relationship to their masses, thus hinting at its fundamental and autonomous nature. We have reported that this relationship between the size of the body and its axial rotation speed extends to the stars and even the galaxies. Next, all congregations of matter spin on their axes in the counterclockwise direction;all satellites orbit their mother bodies also in the counterclockwise direction, <i>i.e.</i>: in our solar system, with only rare exceptions, the satellite bodies follow the mother bodies’ axial rotation. This relationship exists also in the case of the rings of planets, the asteroids and the Kuiper belt bodies, as well as the stars and their galaxies. We also noted the intricate involvements between spin and gravity in the exquisite phenomena of synchronous and negative rotations of planets and some satellites;we have explained in detail how these two phenomena occur. The closest large moons of the gas and ice giants and the earth’s moon exhibit synchronous rotation. In this paper we present evidence that these synchronously rotating satellite bodies’ <b>axial rotation speed</b> is closely related to the size and the axial rotation speeds of their respective mother bodies. In the satellites that follow a non-synchronous rotation (most of the planets and their satellites) the satellites’ own rotation speed usually dominates. In all these rotational/orbital motions, we believe, the axial rotation and gravity collaborate with the resultant centrifugal force, which prevents the satellite bodies from crashing into the mother bodies. We have inferred from the above observations that the axial spin is a fundamental property of matter, akin to gravity, electromagnetism, and strong and weak nuclear forces. This inherent property of matter to spin on its axis is what initiates all celestial body motions and makes such motions perpetual. The lateral motions of stars within the galaxies, are also influenced by the sizes of the stars;the larger the star, the faster it moves radially. Similarly, the larger the spiral galaxy, the faster it rotates on its axis. We extrapolate from these observations that the axial rotational speeds of galaxies affect their motion in space as well, that this is circumferential, and we predict this will also be in the counterclockwise direction. This lateral movement of the galaxies will give the appearance of the whole universe spinning on its axis.展开更多
We briefly review the proposed relations between the frequencies of twin kilohertz quasi-periodic oscillations(kHz QPOs) and the spin frequencies in neutron star low-mass X-ray binaries(NSLMXBs).To test the validity o...We briefly review the proposed relations between the frequencies of twin kilohertz quasi-periodic oscillations(kHz QPOs) and the spin frequencies in neutron star low-mass X-ray binaries(NSLMXBs).To test the validity of the proposed models,we estimate the spin frequencies under these theoretical relations and compare them with the measured ones.It seems that magnetohydrodynamic(MHD) oscillations are more promising to account for the kHz QPOs.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.10905007 and 61078011)the Fundamental Research Funds for the Central Universities,China(Grant No.DUT12LK28)
文摘We study the entanglement evolution in a weakly coupled bipartite system with a large energy level difference under the influence of spin-star environments. The subsystems can be coupled to a pure state or a thermal equilibrium state spin-star environment. Our results show that, in the case of the coupling strength being less than the energy level difference of the subsystems （weakly coupled）, the spin-star environment can always be used to assist the entanglement generation of the bipartite system.
基金supported by the National Natural Science Foundation of China (Grant Nos. 11175108, U1432119, 1146114100, 11205075, 11375076 and 11475104)the Shandong Natural Science Foundation (Grant No. ZR2014AQ012)the Young Scholars Program of Shandong University, Weihai (Grant No. 2015WHWLJH01)
文摘We study the dimensionless spin parameter j ≡ cJ/（GM2） of different kinds of uniformly rotating compact stars, including traditional neutron stars, hyperonic neutron stars and hybrid stars, based on relativistic mean field theory and the MIT bag model. It is found that j ~ 0.7, which had been suggested in traditional neutron stars, is sustained for hyperonic neutron stars and hybrid stars with M 〉 0.5 MG. Not the interior but rather the crust structure of the stars is a key factor to determine jmax for three kinds of selected compact stars. Furthermore, a universal formula j = 0.63（f/fK） -- 0.42（f/fK）2 ＋ 0.48（f/fK）z is suggested to determine the spin parameter at any rotational frequency f smaller than the Keplerian frequency fK.
文摘The angular acceleration due to the spin effect increases the burning rate of solid propellant and changes the motor performance by increasing the operating pressure and decreasing the burning time. So it is important to know the grain regression taken place in the solid propellant rocket motor in the acceleration field. This study represents the grain regression analysis of two-dimensional axis-symmetric star grain configuration of the solid propellant rocket motor with spin induced acceleration effect and pressure effect on burn rate using geometrical and numerical analysis. While the rocket is spinning, the burn rates on each point of the propellant surface are different with its radial distance, acceleration vector angle and surface slope. With the different burn rates on the propellant surface, we analyze the propellant surface perimeter and port area, and these results are compared with those of constant burn rate and burn rate affected by the chamber pressure.
文摘This is the final article in our series dealing with the interplay of spin and gravity that leads to the generation, and continuation of celestial body motions in the universe. In our prior studies we focused on such interactions in the elementary particles, and in the celestial bodies in the solar system. Foremost among the findings was that, along with gravity, matter at all levels exhibits axial spin. We further noted that all freestanding bodies outside our solar system, including the largest such units, the stars and galaxies also spin on their axes. Also, the axial rotation speed of planets in our solar system has a linear positive relationship to their masses, thus hinting at its fundamental and autonomous nature. We have reported that this relationship between the size of the body and its axial rotation speed extends to the stars and even the galaxies. Next, all congregations of matter spin on their axes in the counterclockwise direction;all satellites orbit their mother bodies also in the counterclockwise direction, <i>i.e.</i>: in our solar system, with only rare exceptions, the satellite bodies follow the mother bodies’ axial rotation. This relationship exists also in the case of the rings of planets, the asteroids and the Kuiper belt bodies, as well as the stars and their galaxies. We also noted the intricate involvements between spin and gravity in the exquisite phenomena of synchronous and negative rotations of planets and some satellites;we have explained in detail how these two phenomena occur. The closest large moons of the gas and ice giants and the earth’s moon exhibit synchronous rotation. In this paper we present evidence that these synchronously rotating satellite bodies’ <b>axial rotation speed</b> is closely related to the size and the axial rotation speeds of their respective mother bodies. In the satellites that follow a non-synchronous rotation (most of the planets and their satellites) the satellites’ own rotation speed usually dominates. In all these rotational/orbital motions, we believe, the axial rotation and gravity collaborate with the resultant centrifugal force, which prevents the satellite bodies from crashing into the mother bodies. We have inferred from the above observations that the axial spin is a fundamental property of matter, akin to gravity, electromagnetism, and strong and weak nuclear forces. This inherent property of matter to spin on its axis is what initiates all celestial body motions and makes such motions perpetual. The lateral motions of stars within the galaxies, are also influenced by the sizes of the stars;the larger the star, the faster it moves radially. Similarly, the larger the spiral galaxy, the faster it rotates on its axis. We extrapolate from these observations that the axial rotational speeds of galaxies affect their motion in space as well, that this is circumferential, and we predict this will also be in the counterclockwise direction. This lateral movement of the galaxies will give the appearance of the whole universe spinning on its axis.
基金supported by the National Natural Science Foundation of China (Grant No. 10873008)the National Basic Research Program of China (Grant No. 2009CB824800)
文摘We briefly review the proposed relations between the frequencies of twin kilohertz quasi-periodic oscillations(kHz QPOs) and the spin frequencies in neutron star low-mass X-ray binaries(NSLMXBs).To test the validity of the proposed models,we estimate the spin frequencies under these theoretical relations and compare them with the measured ones.It seems that magnetohydrodynamic(MHD) oscillations are more promising to account for the kHz QPOs.
