The world is facing the third important global power shift.The United States,EU, Japan,Russia,China,and the newly emerging power group are becoming the six big forces in the international center stage,while the former...The world is facing the third important global power shift.The United States,EU, Japan,Russia,China,and the newly emerging power group are becoming the six big forces in the international center stage,while the former three forces and the latter three belong to two groups,waning and waxing respectively.The major shift in the global balance of power is bound to give rise to the transitional multi-polar configuration,which implies a shifting of leadership over the configuration,China and U.S.outweighing other forces,global issues looming large,homogeneity blending with heterogeneity,and a shifting center of world powers.The transitional multi-polar configuration is all about change,upon which China is one of the decisive forces.展开更多
WITH the trend of multi-polarization, economic globalization, cultural diversity, and wide IT application, the uncertainties in the international landscape have been increasing and the global challenges we face have n...WITH the trend of multi-polarization, economic globalization, cultural diversity, and wide IT application, the uncertainties in the international landscape have been increasing and the global challenges we face have never been more serious. In this scenario, there is still hope for the world to continue its development which depends on a prosperous, stable, and sustainable Asia.展开更多
Dynamic stress concentration and pore pressure concentration around an infinitely long cylindrical cavity of circular cross-section subjected to harmonic plane dilatational waves in fluid-saturated porous elastic half...Dynamic stress concentration and pore pressure concentration around an infinitely long cylindrical cavity of circular cross-section subjected to harmonic plane dilatational waves in fluid-saturated porous elastic half-space were obtained by a complex function method based on potential function and multi-polar coordinate. The steady state Biot’s dynamic field equations of porous elastic solid with a viscous liquid were uncoupled into Helmholtz equations via given potential functions. A circular cavity with large radius is used to replace the straight boundary of the saturated porous elastic half-space. The stresses and pore pressures were obtained by using complex functions in multi-polar coordinates with certain boundary conditions of the solid matrix and the fluid matrix. The approximate solutions were compared to existing numerical solutions. Then the variations of the coefficients of dynamic stress concentration and the pore pressures concentration on boundaries of the cavity were discussed with different parameter conditions. The results of the given numerical example indicate that the method used is useful and efficient to the scattering and dynamic stress concentration of plane dilatational waves in saturated porous elastic half-space.展开更多
Clashes between globalization and anti-globalization forces, between US hegemony and emerging powers, and between unilateralism and multilateralism have since early 2018 become pronounced. The unprecedented changes be...Clashes between globalization and anti-globalization forces, between US hegemony and emerging powers, and between unilateralism and multilateralism have since early 2018 become pronounced. The unprecedented changes being seen now intensify the mismatch between security challenges and global security mechanisms that contributes to our uncertain times. The current US judgment over the international situation is hasty, one-sided and negative. By deliberately reducing the dependence between China and the US over shared interests, the US pushes Sino-US relations towards a new cold war. China, in analyzing causal relationships and developments at a macroscopic level, seeks convergence of its national interests and humanity’ s common interests. In pooling the wisdom to design an operable international strategy and in using international cooperation in this globalized era, China is committed to new approaches to international relations and great power relations.展开更多
The performance and capacity of multiple-input multiple-output (MIMO) wireless channels are limited by the spatial fading correlation between antenna elements. This limitation is due to the use of mono polarized anten...The performance and capacity of multiple-input multiple-output (MIMO) wireless channels are limited by the spatial fading correlation between antenna elements. This limitation is due to the use of mono polarized antennas at receiver and transmitter sides. In this paper, in order to reduce the antenna correlation, the polarization diversity technique is employed. Although the spatial antenna correlation is attenuated for multi-polarization configurations, the cross-polar components appear. This paper highlights the impact of depolarization effect on the MIMO channel capacity for a 4×4 uniform linear antenna array. We assume that the channel is unknown at the transmitter and perfectly known at the receiver so that equal power is distributed to each of the transmit antennas. The numerical results illustrate that for low depolarization and spatial correlation, the capacity of single-polarization configuration behaves better than that of multi-polarization configuration.展开更多
The Arab Spring has changed the political landscape in the Arab world.The spring which began as genuine grass-root movement designed to create more equitable social projects,was steered by Western powers and local Isl...The Arab Spring has changed the political landscape in the Arab world.The spring which began as genuine grass-root movement designed to create more equitable social projects,was steered by Western powers and local Islamists in different directions with these powers heavily intervening to control and/or weaken Arab states.China has pursued a policy of non-intervention in the domestic affairs of Arab states,and letting the peoples decide their own future.China may have miscalculated when it allowed NATO to interfere in Libya.That intervention had catastrophic consequences for China and Libya.Consequently,China,in collaboration with Russia decided not to repeat the same experience in Syria especially since foreign intervention in this case will be even more catastrophic.China vetoed Security Council draft resolutions calling for regime change in Syria and insisted on letting the Syrians decide peacefully their future course of action.Further,China under the new leadership has suggested for the first time a four-point program to settle the Arab-Israeli conflict.The article argues that the Chinese-Russian approach to the Syrian crisis is bound to have long-term implications for the future of the Arab world.As the signs of the positive contributions of that approach are emerging,China should proceed to reinforce these contributions through a concerted approach to engage with the new regimes in the Arab world,strengthen the China-Arab States Cooperation Forum,correct the imbalances of Sino-Arab trade,especially with the countries of the Arab Spring,focus on investing in these countries in labor-intensive industries,putting the four-point proposal on the agenda of ArabIsraeli negotiations,and,most importantly,deal with the question of the Israeli nuclear capabilities and the potential of Israel going to war against Iran,a scenario which will represent a major setback to the Chinese achievements in the region.展开更多
文摘The world is facing the third important global power shift.The United States,EU, Japan,Russia,China,and the newly emerging power group are becoming the six big forces in the international center stage,while the former three forces and the latter three belong to two groups,waning and waxing respectively.The major shift in the global balance of power is bound to give rise to the transitional multi-polar configuration,which implies a shifting of leadership over the configuration,China and U.S.outweighing other forces,global issues looming large,homogeneity blending with heterogeneity,and a shifting center of world powers.The transitional multi-polar configuration is all about change,upon which China is one of the decisive forces.
文摘WITH the trend of multi-polarization, economic globalization, cultural diversity, and wide IT application, the uncertainties in the international landscape have been increasing and the global challenges we face have never been more serious. In this scenario, there is still hope for the world to continue its development which depends on a prosperous, stable, and sustainable Asia.
文摘Dynamic stress concentration and pore pressure concentration around an infinitely long cylindrical cavity of circular cross-section subjected to harmonic plane dilatational waves in fluid-saturated porous elastic half-space were obtained by a complex function method based on potential function and multi-polar coordinate. The steady state Biot’s dynamic field equations of porous elastic solid with a viscous liquid were uncoupled into Helmholtz equations via given potential functions. A circular cavity with large radius is used to replace the straight boundary of the saturated porous elastic half-space. The stresses and pore pressures were obtained by using complex functions in multi-polar coordinates with certain boundary conditions of the solid matrix and the fluid matrix. The approximate solutions were compared to existing numerical solutions. Then the variations of the coefficients of dynamic stress concentration and the pore pressures concentration on boundaries of the cavity were discussed with different parameter conditions. The results of the given numerical example indicate that the method used is useful and efficient to the scattering and dynamic stress concentration of plane dilatational waves in saturated porous elastic half-space.
文摘Clashes between globalization and anti-globalization forces, between US hegemony and emerging powers, and between unilateralism and multilateralism have since early 2018 become pronounced. The unprecedented changes being seen now intensify the mismatch between security challenges and global security mechanisms that contributes to our uncertain times. The current US judgment over the international situation is hasty, one-sided and negative. By deliberately reducing the dependence between China and the US over shared interests, the US pushes Sino-US relations towards a new cold war. China, in analyzing causal relationships and developments at a macroscopic level, seeks convergence of its national interests and humanity’ s common interests. In pooling the wisdom to design an operable international strategy and in using international cooperation in this globalized era, China is committed to new approaches to international relations and great power relations.
文摘The performance and capacity of multiple-input multiple-output (MIMO) wireless channels are limited by the spatial fading correlation between antenna elements. This limitation is due to the use of mono polarized antennas at receiver and transmitter sides. In this paper, in order to reduce the antenna correlation, the polarization diversity technique is employed. Although the spatial antenna correlation is attenuated for multi-polarization configurations, the cross-polar components appear. This paper highlights the impact of depolarization effect on the MIMO channel capacity for a 4×4 uniform linear antenna array. We assume that the channel is unknown at the transmitter and perfectly known at the receiver so that equal power is distributed to each of the transmit antennas. The numerical results illustrate that for low depolarization and spatial correlation, the capacity of single-polarization configuration behaves better than that of multi-polarization configuration.
文摘The Arab Spring has changed the political landscape in the Arab world.The spring which began as genuine grass-root movement designed to create more equitable social projects,was steered by Western powers and local Islamists in different directions with these powers heavily intervening to control and/or weaken Arab states.China has pursued a policy of non-intervention in the domestic affairs of Arab states,and letting the peoples decide their own future.China may have miscalculated when it allowed NATO to interfere in Libya.That intervention had catastrophic consequences for China and Libya.Consequently,China,in collaboration with Russia decided not to repeat the same experience in Syria especially since foreign intervention in this case will be even more catastrophic.China vetoed Security Council draft resolutions calling for regime change in Syria and insisted on letting the Syrians decide peacefully their future course of action.Further,China under the new leadership has suggested for the first time a four-point program to settle the Arab-Israeli conflict.The article argues that the Chinese-Russian approach to the Syrian crisis is bound to have long-term implications for the future of the Arab world.As the signs of the positive contributions of that approach are emerging,China should proceed to reinforce these contributions through a concerted approach to engage with the new regimes in the Arab world,strengthen the China-Arab States Cooperation Forum,correct the imbalances of Sino-Arab trade,especially with the countries of the Arab Spring,focus on investing in these countries in labor-intensive industries,putting the four-point proposal on the agenda of ArabIsraeli negotiations,and,most importantly,deal with the question of the Israeli nuclear capabilities and the potential of Israel going to war against Iran,a scenario which will represent a major setback to the Chinese achievements in the region.
