Extensive reading has long been applied in the English as a foreign language classroom in China,but the fundamental theories and practical instruction are not satisfactory. The study aims to synthesize and examine ext...Extensive reading has long been applied in the English as a foreign language classroom in China,but the fundamental theories and practical instruction are not satisfactory. The study aims to synthesize and examine extensive reading studies over the past fifty years(1962-2019) from a holistic perspective. By performing a qualitative meta-analysis, a total of 81 articles published in widely accepted journals were carefully coded and analyzed. Three latent problems emerged,including that 1) most extensive reading researchers misunderstand the inherent characteristic of extensive reading(i. e., pleasure reading) and less frequently follow the principles of extensive reading instruction;2) there are methodological weaknesses in empirical research designs, and;3)research scope is limited regarding participants and methodology. Suggestions for extensive reading research and instruction are included.展开更多
Synthetic macrocyclic host molecules always play an essential role in the establishment and development of supramolecular chemistry. Along with the continuous interests in the study of classical macrocycles, recent de...Synthetic macrocyclic host molecules always play an essential role in the establishment and development of supramolecular chemistry. Along with the continuous interests in the study of classical macrocycles, recent decades have witnessed the emergence and rapid development of the chemistry and supramolecular chemistry of novel and functional macrocycles. Owing to their easy availability, a self-tunable V-shaped cavity resulted from 1,3-alternate conformation, and diversified electronic features steered by the interplay between heteroatom linkages and aromatic rings, heteracalixaromatics act as a type of versatile and powerful macrocyclic hosts in molecular recognition and fabrication of supramolecular systems. Very recently, by means of engineering the bond connectivity or the recombination of chemical bonds within heteracalixaromatics, we have devised coronarenes, a new generation of macrocycles. In this concise review, macrocyclic and supramolecular chemistry of coronarenes are summarized in the order of their syntheses, structural features, molecular recognition and self-assembly properties. In the last part of this article, personal perspectives on the study of macrocyclic and supramolecular chemistry will also be discussed.展开更多
文摘Extensive reading has long been applied in the English as a foreign language classroom in China,but the fundamental theories and practical instruction are not satisfactory. The study aims to synthesize and examine extensive reading studies over the past fifty years(1962-2019) from a holistic perspective. By performing a qualitative meta-analysis, a total of 81 articles published in widely accepted journals were carefully coded and analyzed. Three latent problems emerged,including that 1) most extensive reading researchers misunderstand the inherent characteristic of extensive reading(i. e., pleasure reading) and less frequently follow the principles of extensive reading instruction;2) there are methodological weaknesses in empirical research designs, and;3)research scope is limited regarding participants and methodology. Suggestions for extensive reading research and instruction are included.
基金supported by the National Natural Science Foundation of China (21732004, 21421064, 91427301, 21132005)Tsinghua University
文摘Synthetic macrocyclic host molecules always play an essential role in the establishment and development of supramolecular chemistry. Along with the continuous interests in the study of classical macrocycles, recent decades have witnessed the emergence and rapid development of the chemistry and supramolecular chemistry of novel and functional macrocycles. Owing to their easy availability, a self-tunable V-shaped cavity resulted from 1,3-alternate conformation, and diversified electronic features steered by the interplay between heteroatom linkages and aromatic rings, heteracalixaromatics act as a type of versatile and powerful macrocyclic hosts in molecular recognition and fabrication of supramolecular systems. Very recently, by means of engineering the bond connectivity or the recombination of chemical bonds within heteracalixaromatics, we have devised coronarenes, a new generation of macrocycles. In this concise review, macrocyclic and supramolecular chemistry of coronarenes are summarized in the order of their syntheses, structural features, molecular recognition and self-assembly properties. In the last part of this article, personal perspectives on the study of macrocyclic and supramolecular chemistry will also be discussed.
