论英语语言学习与数学思维

在这篇文章中我们通过对数学语言与英语语言的对比,指出两种语言的对比实际上是,两种语言思维模式的对比。并从概念结构思维与数学映射思维的角度对英语语言做了初步探讨,为英语语言学习者,教学工作者提供了一个新的学习研究途径。     

关于当前大学生消费状况的调查分析与思考

本文通过对当前大学生消费状况的抽样调查,用统计数据描述了当前大学生的经济采源与家庭经济状况、消费水平与消费结构,消费认知与消费习惯,进而讨论分析了当前天学生的消费特点,并对高校在当前大学生消费的教育与引导方面提出了相关建议。     

Two-dimensional characterization of three-dimensional magnetic bubbles in Fe3Sn2 nanostructures

We report differential phase contrast scanning transmission electron microscopy (TEM) of nanoscale magnetic objects in Kagome ferromagnet Fe₃Sn₂ nanostructures. This technique can directly detect the deflection angle of a focused electron beam, thus allowing clear identification of the real magnetic structures of two magnetic objects including three-ring and complex arch-shaped vortices in Fe₃Sn₂ by Lorentz-TEM imaging. Numerical calculations based on real material-specific parameters well reproduced the experimental results, showing that the magnetic objects can be attributed to integral magnetizations of two types of complex three-dimensional (3D) magnetic bubbles with depth-modulated spin twisting. Magnetic configurations obtained using the high-resolution TEM are generally considered as two-dimensional (2D) magnetic objects previously. Our results imply the importance of the integral magnetizations of underestimated 3D magnetic structures in 2D TEM magnetic characterizations.     

宗法关系在清代经济活动中解体的时空差异——基于吉昌契约文书的考察

基于吉昌契约文书的考察。提出清代经济活动中宗法关系的解体具有时空差异,西南内陆地区经济活动中的宗法关系解体要晚于江南等经济发达地区。这既有商品经济发育程度不一的影响,也与国家、市场与社会的博弈有关。