特里·安德森教授是加拿大国家远程教育研究会(Canada Research Chair in Distance Education)主席,国际新一代远程教育研究者的杰出代表。他在远程教育和教育技术领域涉猎广泛、成果颇丰。本文对他提出的远程教育教学中的6种...特里·安德森教授是加拿大国家远程教育研究会(Canada Research Chair in Distance Education)主席,国际新一代远程教育研究者的杰出代表。他在远程教育和教育技术领域涉猎广泛、成果颇丰。本文对他提出的远程教育教学中的6种教学交互理论、在线学习模型、探究社区和等效交互原理等关于远程教育的理论建树进行了剖析,介绍了他参与和主持的远程教育重要项目以及他培养远程教育硕士的方法。最后,对他的理论和实践作了综合评价并提出了其对中国远程教育发展的几点启示。展开更多
An alternative scheme is presented to generate arbitrary anticorrelated states of a two-mode field. In the scheme, a sequence of A-type three-level atoms are orderly sent across the cavity to interact with the cavity ...An alternative scheme is presented to generate arbitrary anticorrelated states of a two-mode field. In the scheme, a sequence of A-type three-level atoms are orderly sent across the cavity to interact with the cavity field initially in the two-mode vacuum state. The detection of all the atoms in the ground state collapses the two-mode field to the desired state. In this way, we can prepare the anticorrelated states of a two-mode field.展开更多
It is well known that energy-momentum is the source of gravitational field. For a long time, it is generally believed that only stars with huge masses can generate strong gravitational field. Based on the unified theo...It is well known that energy-momentum is the source of gravitational field. For a long time, it is generally believed that only stars with huge masses can generate strong gravitational field. Based on the unified theory of gravitational interactions and electromagnetic interactions, a new mechanism of the generation of gravitational field is studied. According to this mechanism, in some special conditions, electromagnetic energy can be directly converted into gravitational energy, and strong gravitational field can be generated without massive stars. Gravity impulse found in experiments is generated by this mechanism.展开更多
文摘特里·安德森教授是加拿大国家远程教育研究会(Canada Research Chair in Distance Education)主席,国际新一代远程教育研究者的杰出代表。他在远程教育和教育技术领域涉猎广泛、成果颇丰。本文对他提出的远程教育教学中的6种教学交互理论、在线学习模型、探究社区和等效交互原理等关于远程教育的理论建树进行了剖析,介绍了他参与和主持的远程教育重要项目以及他培养远程教育硕士的方法。最后,对他的理论和实践作了综合评价并提出了其对中国远程教育发展的几点启示。
基金supported by National Natural Science Foundation of China under Grant No.10674025the Fund of Education Department of Fujian Province under Grant No.JB06043
文摘An alternative scheme is presented to generate arbitrary anticorrelated states of a two-mode field. In the scheme, a sequence of A-type three-level atoms are orderly sent across the cavity to interact with the cavity field initially in the two-mode vacuum state. The detection of all the atoms in the ground state collapses the two-mode field to the desired state. In this way, we can prepare the anticorrelated states of a two-mode field.
文摘It is well known that energy-momentum is the source of gravitational field. For a long time, it is generally believed that only stars with huge masses can generate strong gravitational field. Based on the unified theory of gravitational interactions and electromagnetic interactions, a new mechanism of the generation of gravitational field is studied. According to this mechanism, in some special conditions, electromagnetic energy can be directly converted into gravitational energy, and strong gravitational field can be generated without massive stars. Gravity impulse found in experiments is generated by this mechanism.
