It was 7 o’clock on November 17, 2001. Chen Qinglong, a hired driver in Dongguan City, Guangdong Province, was driving his vehicle to the checkpoint at Changping town of the city. A security guard of the town’s publ...It was 7 o’clock on November 17, 2001. Chen Qinglong, a hired driver in Dongguan City, Guangdong Province, was driving his vehicle to the checkpoint at Changping town of the city. A security guard of the town’s public security bureau blocked his way on the pretext that "his vehicle bumped into a security guard and injured him a few days ago." Then, a policeman from a sub-police station in Changping Town took Chen and his vehicle to the sub-police station.展开更多
The exchange bias （EB） of the ferromagnetic （FM）/antiferromagnetic （AFM） bilayers in a compensated case is studied by use of the many-body Green＇s function method of quantum statistical theory. The so-called co...The exchange bias （EB） of the ferromagnetic （FM）/antiferromagnetic （AFM） bilayers in a compensated case is studied by use of the many-body Green＇s function method of quantum statistical theory. The so-called compensated case is that there is no net magnetization on the AFM side of the interface. Our conclusion is that the EB in this case is primarily from the asymmetry of the interracial exchange coupling strengths between the FM and the two sublattices of the AFM. The effects of the layer thickness, temperature and the interracial coupling strength oi2 the exchange bias HE are investigated. The dependence of HE on the FM layer thickness and temperature is qualitatively in agreement with experimental results. HE is nearly inversely proportional to FM thickness. When temperature varies, both HE and He decrease with temperature increasing. The anisotropy of the FM layer only slightly influence He, but does not influence HE.展开更多
Because it offers an effective means to alleviate current ecological problems and a way to coordinate sustainable economic and social development with protection of the environment,eco-compensation has become a subjec...Because it offers an effective means to alleviate current ecological problems and a way to coordinate sustainable economic and social development with protection of the environment,eco-compensation has become a subject of interest to scholars and governments all over the world.A great many studies have been carried out and eco-compensation schemes have been put into practice;there have been many fruitful results.Based on a review of related research and practices,this paper attempts first to discuss domestic and international eco-compensation research and practices in terms of the meaning of eco-compensation and its components（stakeholders,compensation criteria,compensation modes,compensation approaches,compensation funds,and compensation effects）.Next,taking into consideration the above discussion,the paper looks at the differences between Chinese and international eco-compensation measures.Finally,existing problems with eco-compensation research and practices in China are summarized and some suggestions are put forward.展开更多
文摘It was 7 o’clock on November 17, 2001. Chen Qinglong, a hired driver in Dongguan City, Guangdong Province, was driving his vehicle to the checkpoint at Changping town of the city. A security guard of the town’s public security bureau blocked his way on the pretext that "his vehicle bumped into a security guard and injured him a few days ago." Then, a policeman from a sub-police station in Changping Town took Chen and his vehicle to the sub-police station.
基金supported by National Natural Science Foundation of China under Grant Nos.10574121,10874160,and 10025420the‘111’Project of the Ministry of Education and the Chinese Academy of Sciences
文摘The exchange bias （EB） of the ferromagnetic （FM）/antiferromagnetic （AFM） bilayers in a compensated case is studied by use of the many-body Green＇s function method of quantum statistical theory. The so-called compensated case is that there is no net magnetization on the AFM side of the interface. Our conclusion is that the EB in this case is primarily from the asymmetry of the interracial exchange coupling strengths between the FM and the two sublattices of the AFM. The effects of the layer thickness, temperature and the interracial coupling strength oi2 the exchange bias HE are investigated. The dependence of HE on the FM layer thickness and temperature is qualitatively in agreement with experimental results. HE is nearly inversely proportional to FM thickness. When temperature varies, both HE and He decrease with temperature increasing. The anisotropy of the FM layer only slightly influence He, but does not influence HE.
基金National Key R&D Plan(2016YFC0503405)National Natural Science Foundation of China(51379084)
文摘Because it offers an effective means to alleviate current ecological problems and a way to coordinate sustainable economic and social development with protection of the environment,eco-compensation has become a subject of interest to scholars and governments all over the world.A great many studies have been carried out and eco-compensation schemes have been put into practice;there have been many fruitful results.Based on a review of related research and practices,this paper attempts first to discuss domestic and international eco-compensation research and practices in terms of the meaning of eco-compensation and its components（stakeholders,compensation criteria,compensation modes,compensation approaches,compensation funds,and compensation effects）.Next,taking into consideration the above discussion,the paper looks at the differences between Chinese and international eco-compensation measures.Finally,existing problems with eco-compensation research and practices in China are summarized and some suggestions are put forward.
