The thermal protection materials and structures are widely used in hypersonic vehicles for the purpose of thermal insulation, and their mechanical behavior is one of the key issues in design and manufacture of hyperso...The thermal protection materials and structures are widely used in hypersonic vehicles for the purpose of thermal insulation, and their mechanical behavior is one of the key issues in design and manufacture of hypersonic vehicles. It is our great pleasure to present the seven papers in this special subject of Theoretical ＆ Applied Mechanics Letters （TAML） and introduce the recent progresses on the mechanical behavior of thermal protection materials and structures by the authors.展开更多
A concept map is a schematic device for representing a set of concept meanings embedded in a framework of propositions.It can be used to evaluate students’knowledge structure.This article introduces the comparative s...A concept map is a schematic device for representing a set of concept meanings embedded in a framework of propositions.It can be used to evaluate students’knowledge structure.This article introduces the comparative study of Chinese and American secondary school students’knowledge structure.They are compared quantitatively and qualitatively in terms of mean score,individual proposition scores,proposition choice and map structure.The results indicate that students’knowledge structures in the two countries are remarkably different.Compared with American students,Chinese students’ability to take an exam is stronger and their mean score is higher.However,Chinese students need to improve their general knowledge and creativity although their basic knowledge is solid and they are better in mastering discipline knowledge and knowledge application.展开更多
基金support from the Natural Science Foundation of China(91016029,91216302,and 91216301)
文摘The thermal protection materials and structures are widely used in hypersonic vehicles for the purpose of thermal insulation, and their mechanical behavior is one of the key issues in design and manufacture of hypersonic vehicles. It is our great pleasure to present the seven papers in this special subject of Theoretical ＆ Applied Mechanics Letters （TAML） and introduce the recent progresses on the mechanical behavior of thermal protection materials and structures by the authors.
文摘A concept map is a schematic device for representing a set of concept meanings embedded in a framework of propositions.It can be used to evaluate students’knowledge structure.This article introduces the comparative study of Chinese and American secondary school students’knowledge structure.They are compared quantitatively and qualitatively in terms of mean score,individual proposition scores,proposition choice and map structure.The results indicate that students’knowledge structures in the two countries are remarkably different.Compared with American students,Chinese students’ability to take an exam is stronger and their mean score is higher.However,Chinese students need to improve their general knowledge and creativity although their basic knowledge is solid and they are better in mastering discipline knowledge and knowledge application.
