Initiated by graphene, two-dimensional(2D) layered materials have attracted much attention owing to their novel layer-number-dependent physical and chemical properties. To fully utilize those properties, a fast and ...Initiated by graphene, two-dimensional(2D) layered materials have attracted much attention owing to their novel layer-number-dependent physical and chemical properties. To fully utilize those properties, a fast and accurate determination of their layer number is the priority. Compared with conventional structural characterization tools, including atomic force microscopy, scanning electron microscopy, and transmission electron microscopy, the optical characterization methods such as optical contrast, Raman spectroscopy, photoluminescence, multiphoton imaging, and hyperspectral imaging have the distinctive advantages of a high-throughput and nondestructive examination. Here, taking the most studied 2D materials like graphene, MoS2, and black phosphorus as examples, we summarize the principles and applications of those optical characterization methods. The comparison of those methods may help us to select proper ones in a cost-effective way.展开更多
词汇学习是英语学习的重要组成部分,但在英语词汇教学中,由于缺乏相应的语篇语境,学生词汇学习效率不高,在实际运用中出现不会使用词汇的尴尬局面因此,创设有效的语篇语境,让学生在语篇中体验情感,理解词汇的内涵和功能迫在眉睫。本文以...词汇学习是英语学习的重要组成部分,但在英语词汇教学中,由于缺乏相应的语篇语境,学生词汇学习效率不高,在实际运用中出现不会使用词汇的尴尬局面因此,创设有效的语篇语境,让学生在语篇中体验情感,理解词汇的内涵和功能迫在眉睫。本文以PEP教忖四年级上册Unit6 Meet my family B部分中的Let’s learn为例,通过教学内容、教学过程和词汇运用这三个部分,探讨了在语篇中进行词汇教学的策略。展开更多
基金supported by the foundation for Innovation Research Groups of the National Natural Science Foundation of China(NSFC)(Grant No.61421002)the National Natural Science Foundation of China(Grant Nos.61475030,615224030,and 61605024)the Central University Basic Scientific Research Business Expenses(Grant No.ZYGX2015Z001)
文摘Initiated by graphene, two-dimensional(2D) layered materials have attracted much attention owing to their novel layer-number-dependent physical and chemical properties. To fully utilize those properties, a fast and accurate determination of their layer number is the priority. Compared with conventional structural characterization tools, including atomic force microscopy, scanning electron microscopy, and transmission electron microscopy, the optical characterization methods such as optical contrast, Raman spectroscopy, photoluminescence, multiphoton imaging, and hyperspectral imaging have the distinctive advantages of a high-throughput and nondestructive examination. Here, taking the most studied 2D materials like graphene, MoS2, and black phosphorus as examples, we summarize the principles and applications of those optical characterization methods. The comparison of those methods may help us to select proper ones in a cost-effective way.
文摘词汇学习是英语学习的重要组成部分,但在英语词汇教学中,由于缺乏相应的语篇语境,学生词汇学习效率不高,在实际运用中出现不会使用词汇的尴尬局面因此,创设有效的语篇语境,让学生在语篇中体验情感,理解词汇的内涵和功能迫在眉睫。本文以PEP教忖四年级上册Unit6 Meet my family B部分中的Let’s learn为例,通过教学内容、教学过程和词汇运用这三个部分,探讨了在语篇中进行词汇教学的策略。