Flipped classroom is a new teaching mode,which has thoroughly reformed the traditional teacher-oriented teaching mode.It has been vigorously promoted and applied to the classrooms of colleges and universities in China...Flipped classroom is a new teaching mode,which has thoroughly reformed the traditional teacher-oriented teaching mode.It has been vigorously promoted and applied to the classrooms of colleges and universities in China in the educational reform and has achieved certain results.Starting from the definition and characteristics of flipped classroom,this paper focuses on the teaching design based on this mode in college English teaching and puts forward the principles and steps for its implementation.展开更多
A novel chemical technique combined with unique plasma activated sintering(PAS) was utilized to prepare consolidated copper matrix composites(CMCs) by adding Cu-SnO_2-rGO layered micro powders as reinforced fillers in...A novel chemical technique combined with unique plasma activated sintering(PAS) was utilized to prepare consolidated copper matrix composites(CMCs) by adding Cu-SnO_2-rGO layered micro powders as reinforced fillers into Cu matrix. The repeating Cu-SnO_2-rGO structure was composed of inner dispersed reduced graphene oxide(r GO), SnO_2 as intermedia and outer Cu coating. SnO_2 was introduced to the surface of rGO sheets in order to prevent the graphene aggregation with SnO_2 serving as spacer and to provide enough active sites for subsequent Cu deposition. This process can guarantee rGO sheets to suffi ciently disperse and Cu nanoparticles to tightly and uniformly anchor on each layer of rGO by means of the SnO_2 active sites as well as strictly control the reduction speed of Cu^(2+). The complete cover of Cu nanoparticles on rGO sheets thoroughly avoids direct contact among rGO layers. Hence, the repeating structure can simultaneously solve the wettability problem between rGO and Cu matrix as well as improve the bonding strength between rGO and Cu matrix at the well-bonded Cu-Sn O_2-rGO interface. The isolated rGO can effectively hinder the glide of dislocation at Cu-r GO interface and support the applied loads. Finally, the compressive strength of CMCs was enhanced when the strengthening effi ciency reached up to 41.展开更多
Accumulation and releasing of trace metal elements on aluminum containing sediments of inner drinking water pipe is discussed,as studied from five variations effecting:raw water quality,chemical reagents,solution pH a...Accumulation and releasing of trace metal elements on aluminum containing sediments of inner drinking water pipe is discussed,as studied from five variations effecting:raw water quality,chemical reagents,solution pH and drinking water flow condition.In order to decrease the release of trace metal elements,and to ensure the pipe operation and human safety,water quality adjustment is suggested to avoid aluminum containing sediments formation in drinking distribution system.The maximum amounts of accumulation of common trace metal elements are given.Future trends of development in this field are also proposed.展开更多
After the concept of BIM (Building Information Modeling) was proposed around 2000, it developed slowly. With the rapid development of hardware, the IFC standard provides reference standards for BEM collaborative desig...After the concept of BIM (Building Information Modeling) was proposed around 2000, it developed slowly. With the rapid development of hardware, the IFC standard provides reference standards for BEM collaborative design, enabling BEM collaborative design to effectively solve the shortcomings of traditional 2D drawing design and become a new market trend.展开更多
Partly because of the influence exerted by the traditional educational management,there are still many problems in Eng⁃lish Teaching for art students.In order to improve their English proficiency and develop their Eng...Partly because of the influence exerted by the traditional educational management,there are still many problems in Eng⁃lish Teaching for art students.In order to improve their English proficiency and develop their English abilities matched with their professional skills,it is necessary to explore news English Teaching methods for art students.This paper mainly discusses the main characteristics of art students’learning,and analyzes the problems of teaching methods adopted by English teachers.Finally,this paper puts forwards some new suggestions in terms of the situation,with the purpose of providing reference for English teaching re⁃form in art schools in China.展开更多
When the membrane material in the air field vibrates, it will drive the movement of the surrounding air. The aerodynamic force generated by the moving air will act on the membrane material in turn, resulting in the ch...When the membrane material in the air field vibrates, it will drive the movement of the surrounding air. The aerodynamic force generated by the moving air will act on the membrane material in turn, resulting in the change of dynamic characteristics such as membrane vibration frequency. In this paper, the additional air mass produced by membrane vibration in air is studied. Firstly, under the assumption that the incoming flow is uniform and incompressible ideal potential flow, the additional air mass acting on the surface is derived by using the thin airfoil theory and potential flow theory respectively. Then, according to the first law of thermodynamics and the principle of aeroelasticity, the analytical expression of the additional air mass is derived. Finally, through a specific example, the variation of the additional air mass with the membrane material parameters and pretension, as well as the influence of the aerodynamic force on the vibration frequency and amplitude of the membrane is obtained.展开更多
文摘Flipped classroom is a new teaching mode,which has thoroughly reformed the traditional teacher-oriented teaching mode.It has been vigorously promoted and applied to the classrooms of colleges and universities in China in the educational reform and has achieved certain results.Starting from the definition and characteristics of flipped classroom,this paper focuses on the teaching design based on this mode in college English teaching and puts forward the principles and steps for its implementation.
基金Funded by the National Natural Science Foundation of China(51572208)the 111 Project(B13035)+1 种基金the National Natural Science Foundation of Hubei Province(2014CFB257 and 2014CFB258)the Fundamental Research Funds for the Central Universities(WUT:2015-III-059)
文摘A novel chemical technique combined with unique plasma activated sintering(PAS) was utilized to prepare consolidated copper matrix composites(CMCs) by adding Cu-SnO_2-rGO layered micro powders as reinforced fillers into Cu matrix. The repeating Cu-SnO_2-rGO structure was composed of inner dispersed reduced graphene oxide(r GO), SnO_2 as intermedia and outer Cu coating. SnO_2 was introduced to the surface of rGO sheets in order to prevent the graphene aggregation with SnO_2 serving as spacer and to provide enough active sites for subsequent Cu deposition. This process can guarantee rGO sheets to suffi ciently disperse and Cu nanoparticles to tightly and uniformly anchor on each layer of rGO by means of the SnO_2 active sites as well as strictly control the reduction speed of Cu^(2+). The complete cover of Cu nanoparticles on rGO sheets thoroughly avoids direct contact among rGO layers. Hence, the repeating structure can simultaneously solve the wettability problem between rGO and Cu matrix as well as improve the bonding strength between rGO and Cu matrix at the well-bonded Cu-Sn O_2-rGO interface. The isolated rGO can effectively hinder the glide of dislocation at Cu-r GO interface and support the applied loads. Finally, the compressive strength of CMCs was enhanced when the strengthening effi ciency reached up to 41.
基金This work was supported by City Collage of Science and Technology.Chongqing University and Chongqing HaiRun institute of energy saving research。
文摘Accumulation and releasing of trace metal elements on aluminum containing sediments of inner drinking water pipe is discussed,as studied from five variations effecting:raw water quality,chemical reagents,solution pH and drinking water flow condition.In order to decrease the release of trace metal elements,and to ensure the pipe operation and human safety,water quality adjustment is suggested to avoid aluminum containing sediments formation in drinking distribution system.The maximum amounts of accumulation of common trace metal elements are given.Future trends of development in this field are also proposed.
文摘After the concept of BIM (Building Information Modeling) was proposed around 2000, it developed slowly. With the rapid development of hardware, the IFC standard provides reference standards for BEM collaborative design, enabling BEM collaborative design to effectively solve the shortcomings of traditional 2D drawing design and become a new market trend.
文摘Partly because of the influence exerted by the traditional educational management,there are still many problems in Eng⁃lish Teaching for art students.In order to improve their English proficiency and develop their English abilities matched with their professional skills,it is necessary to explore news English Teaching methods for art students.This paper mainly discusses the main characteristics of art students’learning,and analyzes the problems of teaching methods adopted by English teachers.Finally,this paper puts forwards some new suggestions in terms of the situation,with the purpose of providing reference for English teaching re⁃form in art schools in China.
文摘When the membrane material in the air field vibrates, it will drive the movement of the surrounding air. The aerodynamic force generated by the moving air will act on the membrane material in turn, resulting in the change of dynamic characteristics such as membrane vibration frequency. In this paper, the additional air mass produced by membrane vibration in air is studied. Firstly, under the assumption that the incoming flow is uniform and incompressible ideal potential flow, the additional air mass acting on the surface is derived by using the thin airfoil theory and potential flow theory respectively. Then, according to the first law of thermodynamics and the principle of aeroelasticity, the analytical expression of the additional air mass is derived. Finally, through a specific example, the variation of the additional air mass with the membrane material parameters and pretension, as well as the influence of the aerodynamic force on the vibration frequency and amplitude of the membrane is obtained.
