For English education primary school,English vocabulary teaching should be attach importance to because in the traditional class of English vocabulary teaching,teachers just fill young minds with knowledge points of e...For English education primary school,English vocabulary teaching should be attach importance to because in the traditional class of English vocabulary teaching,teachers just fill young minds with knowledge points of each word in a 35-minute class yet fail to lay emphasis of learners’meaningful learning and autonomic learning as well as their very limited attention spans.To support traditional English vocabulary teaching classes,the research proposes the theme-based English vocabulary micro-lectures designed on the basis of experiential learning theory and constructivist learning theory as well as the analyses of target users of high-level students in the primary school.After application of the micro-lectures into practice,the research assesses the effect of the micro-lectures on the learners and then makes suggestions for design principles of theme-based vocabulary micro-lectures about selection of contents and vocabulary themes,supplementary teaching activities and teacher interaction in the micro-lectures for high-level students in the primary school.Also,the designers should make multi-level English vocabulary micro-lectures according to learners’English proficiency and increase repetition rates of vocabularies in the micro-lectures.展开更多
Modeling of the roughness in micro-nano scale and its influence have not been fully investigated, however the roughness will cause amplitude and phase errors of the radiating slot, and decrease the precision and effic...Modeling of the roughness in micro-nano scale and its influence have not been fully investigated, however the roughness will cause amplitude and phase errors of the radiating slot, and decrease the precision and efficiency of the SWA in Ku-band. Firstly, the roughness is simulated using the electromechanical coupled（EC） model. The relationship between roughness and the antenna＇s radiation properties is obtained. For verification, an antenna proto- type is manufactured and tested, and the simulation method is introduced. According to the prototype, a contrasting experiment dealing with the flatness of the radiating plane is conducted to test the simulation method. The advantage of the EC model is validated by comparisons of the EC model and two classical roughness models （sine wave and fractal function）, which shows that the EC model gives a more accurate description model for roughness, the maxi- mum error is 13%. The existence of roughness strongly broadens the beamwidth and raises the side-lobe level of SWA, which is 1.2 times greater than the ideal antenna. In addition, effect of the EC model＇s evaluation indices is investigated, the most affected scale of the roughness is found, which is 1/10 of the working wavelength. The proposed research provides the instruction for antenna designing and manufacturing.展开更多
文摘For English education primary school,English vocabulary teaching should be attach importance to because in the traditional class of English vocabulary teaching,teachers just fill young minds with knowledge points of each word in a 35-minute class yet fail to lay emphasis of learners’meaningful learning and autonomic learning as well as their very limited attention spans.To support traditional English vocabulary teaching classes,the research proposes the theme-based English vocabulary micro-lectures designed on the basis of experiential learning theory and constructivist learning theory as well as the analyses of target users of high-level students in the primary school.After application of the micro-lectures into practice,the research assesses the effect of the micro-lectures on the learners and then makes suggestions for design principles of theme-based vocabulary micro-lectures about selection of contents and vocabulary themes,supplementary teaching activities and teacher interaction in the micro-lectures for high-level students in the primary school.Also,the designers should make multi-level English vocabulary micro-lectures according to learners’English proficiency and increase repetition rates of vocabularies in the micro-lectures.
基金Supported by National Natural Science Foundation of China(Grant Nos.51305322,51405364,51475348)
文摘Modeling of the roughness in micro-nano scale and its influence have not been fully investigated, however the roughness will cause amplitude and phase errors of the radiating slot, and decrease the precision and efficiency of the SWA in Ku-band. Firstly, the roughness is simulated using the electromechanical coupled（EC） model. The relationship between roughness and the antenna＇s radiation properties is obtained. For verification, an antenna proto- type is manufactured and tested, and the simulation method is introduced. According to the prototype, a contrasting experiment dealing with the flatness of the radiating plane is conducted to test the simulation method. The advantage of the EC model is validated by comparisons of the EC model and two classical roughness models （sine wave and fractal function）, which shows that the EC model gives a more accurate description model for roughness, the maxi- mum error is 13%. The existence of roughness strongly broadens the beamwidth and raises the side-lobe level of SWA, which is 1.2 times greater than the ideal antenna. In addition, effect of the EC model＇s evaluation indices is investigated, the most affected scale of the roughness is found, which is 1/10 of the working wavelength. The proposed research provides the instruction for antenna designing and manufacturing.
