South Africa is a country of many cultures. Before the first democratic elections in 1994, people of different cultures found it difficult to interact because of legislated racial segregation, which made it difficult ...South Africa is a country of many cultures. Before the first democratic elections in 1994, people of different cultures found it difficult to interact because of legislated racial segregation, which made it difficult for blacks to mix with whites in almost all spheres of life. The only place interaction could take place was in the workplace. As a result, children from different cultural groups had few opportunities to interact. This made it impossible for South African children to learn about the cultures of other racial groups. With the introduction of a democratic government, all segregation laws were relaxed and people mixed freely in all spheres of life. Intercultural communication became commonplace. This new scenario presented a challenge to many South African children, but despite the limits imposed before 1994, children from all racial groups associated successfully. Their ability to cope with this situation with so much more ease than adults was remarkable. This paper seeks to highlight the communication skills used by South African children from all cultural backgrounds to achieve intercultural competence in a relatively short space of time. The paper will further reflect on the impact made on African children by intercultural interaction and competence.展开更多
We in this paper study a class of mechanism of the production of the primordial magnetic field(PMF) in the non-singular bouncing cosmology, through the coupling of the electromagnetic field to gravity. We adopt an ele...We in this paper study a class of mechanism of the production of the primordial magnetic field(PMF) in the non-singular bouncing cosmology, through the coupling of the electromagnetic field to gravity. We adopt an electrodynamic model with a coupling coefficient as a function of the scale factor a, i.e., f = 1 +(a/a?)^(-n), with a? and n > 0 being constants. With analytical calculations, we find that this model can yield a blue tilted power spectrum of PMF on large scales from 1 Mpc to the Hubble length if the bounce scenario has experienced a contracting phase with an equation-of-state parameter larger than-1/3. Furthermore, in order to satisfy the constraints of observational data, the present mechanism favors the so-called ekpyrotic-bounce paradigm. The back-reaction of the energy density of PMF at the bouncing point can lead to additional theoretical constraints on the underlying bouncing paradigm.展开更多
文摘South Africa is a country of many cultures. Before the first democratic elections in 1994, people of different cultures found it difficult to interact because of legislated racial segregation, which made it difficult for blacks to mix with whites in almost all spheres of life. The only place interaction could take place was in the workplace. As a result, children from different cultural groups had few opportunities to interact. This made it impossible for South African children to learn about the cultures of other racial groups. With the introduction of a democratic government, all segregation laws were relaxed and people mixed freely in all spheres of life. Intercultural communication became commonplace. This new scenario presented a challenge to many South African children, but despite the limits imposed before 1994, children from all racial groups associated successfully. Their ability to cope with this situation with so much more ease than adults was remarkable. This paper seeks to highlight the communication skills used by South African children from all cultural backgrounds to achieve intercultural competence in a relatively short space of time. The paper will further reflect on the impact made on African children by intercultural interaction and competence.
基金supported by the National Natural Science Foundation of China for Fostering Talents in Basic Science (Grant No. J1310021)the National Natural Science Foundation of China (Grant Nos. 11653002, 11722327, and 11421303)+1 种基金the China Academy of Space Technology (CAST) Young Elite Scientists Sponsorship Program (Grant No. 2016QNRC001)the Fundamental Research Funds for the Central Universities
文摘We in this paper study a class of mechanism of the production of the primordial magnetic field(PMF) in the non-singular bouncing cosmology, through the coupling of the electromagnetic field to gravity. We adopt an electrodynamic model with a coupling coefficient as a function of the scale factor a, i.e., f = 1 +(a/a?)^(-n), with a? and n > 0 being constants. With analytical calculations, we find that this model can yield a blue tilted power spectrum of PMF on large scales from 1 Mpc to the Hubble length if the bounce scenario has experienced a contracting phase with an equation-of-state parameter larger than-1/3. Furthermore, in order to satisfy the constraints of observational data, the present mechanism favors the so-called ekpyrotic-bounce paradigm. The back-reaction of the energy density of PMF at the bouncing point can lead to additional theoretical constraints on the underlying bouncing paradigm.
