Since the discovery of the halo nucleus ^(11)Li in 1985,halo phenomena in exotic nuclei have always been an important frontier in nuclear physics research.The relativistic density functional theory has achieved great ...Since the discovery of the halo nucleus ^(11)Li in 1985,halo phenomena in exotic nuclei have always been an important frontier in nuclear physics research.The relativistic density functional theory has achieved great success inthestudyofhalonucleg,theself-consistent description ofhalonucleusLiandthe microscopic predic tion of deformed halo nuclei.This paper introduces some recent progresses based on the deformed relativistic Hartree-Bogoliubov theory in continuum(DRHBc)and the triaxial relativistic Hartree-Bogoliubov theory in continum(TRHBc).A microscopic and self-consistent description of the deformed halo nucleus ^(37)Mg,including its small one-neutron separation energy,large root-mean-square radius,diffuse density distribution,and p-wave components for the halo neutron,has been achieved by the DRHBc theory.The DRHBc theory has also predicted a deformed neutron halo and the collapse of the N=28 shll closureintherecently discovered isotope ^(39)Na The TRHBc theory has been newly developed and applied to the aluminum isotopic chain.The heaviest odd-odd ^(42)AI has been predicted as a triaxial halo nucleus with a novel shape decoupling between its core and halo at the triaxial level.展开更多
英语专业八级改错题是检测英语专业水平的重要手段之一,不同层次的英语专业学习者答题情况尚无人研究,有必要做专题探讨。通过答卷研判、访谈及归因分析,研究发现:1)英语专业学习者英语综合运用水平(English proficiency in comprehensi...英语专业八级改错题是检测英语专业水平的重要手段之一,不同层次的英语专业学习者答题情况尚无人研究,有必要做专题探讨。通过答卷研判、访谈及归因分析,研究发现:1)英语专业学习者英语综合运用水平(English proficiency in comprehensive application,EPCA)整体不高,所有被试的均分为2.7分,只有12.5%的被试达到及格线,单题词汇辨析的正确率低至0.83%;2)4组被试的EPCA,只有大学教师组与其他各组之间存在显著性差异,本科二年级组、本科四年级组、中小学教师组各组之间均无显著性差异,说明EPCA不会简单地随着学习时间的延长而提高;3)EPCA较低,是由于一语词义与二语音形混合的词汇学习方法以及“英语思维缺席”制约了英语综合运用能力(English competence in comprehensive application,ECCA)的发展。建议采用“遵循英语思维特点学习英语”的策略,以便提高ECCA。展开更多
文摘Since the discovery of the halo nucleus ^(11)Li in 1985,halo phenomena in exotic nuclei have always been an important frontier in nuclear physics research.The relativistic density functional theory has achieved great success inthestudyofhalonucleg,theself-consistent description ofhalonucleusLiandthe microscopic predic tion of deformed halo nuclei.This paper introduces some recent progresses based on the deformed relativistic Hartree-Bogoliubov theory in continuum(DRHBc)and the triaxial relativistic Hartree-Bogoliubov theory in continum(TRHBc).A microscopic and self-consistent description of the deformed halo nucleus ^(37)Mg,including its small one-neutron separation energy,large root-mean-square radius,diffuse density distribution,and p-wave components for the halo neutron,has been achieved by the DRHBc theory.The DRHBc theory has also predicted a deformed neutron halo and the collapse of the N=28 shll closureintherecently discovered isotope ^(39)Na The TRHBc theory has been newly developed and applied to the aluminum isotopic chain.The heaviest odd-odd ^(42)AI has been predicted as a triaxial halo nucleus with a novel shape decoupling between its core and halo at the triaxial level.
文摘英语专业八级改错题是检测英语专业水平的重要手段之一,不同层次的英语专业学习者答题情况尚无人研究,有必要做专题探讨。通过答卷研判、访谈及归因分析,研究发现:1)英语专业学习者英语综合运用水平(English proficiency in comprehensive application,EPCA)整体不高,所有被试的均分为2.7分,只有12.5%的被试达到及格线,单题词汇辨析的正确率低至0.83%;2)4组被试的EPCA,只有大学教师组与其他各组之间存在显著性差异,本科二年级组、本科四年级组、中小学教师组各组之间均无显著性差异,说明EPCA不会简单地随着学习时间的延长而提高;3)EPCA较低,是由于一语词义与二语音形混合的词汇学习方法以及“英语思维缺席”制约了英语综合运用能力(English competence in comprehensive application,ECCA)的发展。建议采用“遵循英语思维特点学习英语”的策略,以便提高ECCA。
