中国脱贫攻坚事业一直受到国外媒体的广泛关注。本研究选取NOW(News on the Web)网络新闻语料库中2011年12月至2022年1月共91篇国外有关中国扶贫报道话语的语料,以Fairclough三维分析模型为理论框架,从文本、话语实践和社会实践三个层...中国脱贫攻坚事业一直受到国外媒体的广泛关注。本研究选取NOW(News on the Web)网络新闻语料库中2011年12月至2022年1月共91篇国外有关中国扶贫报道话语的语料,以Fairclough三维分析模型为理论框架,从文本、话语实践和社会实践三个层面详细论述欧美西方国家、非洲国家以及南亚、东南亚国家相关新闻报道的不同焦点和背后的意识形态呈现模式。研究发现,在有关脱贫攻坚的报道中,西方媒体偏重于中国政治主题,非洲媒体更多赞扬中国扶贫成就、国际合作和经验分享,而东南亚媒体侧重扶贫在农业及经济方面的进展。通过考察不同国家和地区对中国减贫治理的认知态度,以期为中国扶贫话语体系建构提供借鉴,实现对外话语的精准化和差异化传播。展开更多
In order to investigate Joule heating power,a three-dimensional finite element model(FEM) was developed to predict Joule heating power in the channels of double-loop inductor. The simulated results were compared with ...In order to investigate Joule heating power,a three-dimensional finite element model(FEM) was developed to predict Joule heating power in the channels of double-loop inductor. The simulated results were compared with experimental data from low load trials for a 400 kW inductor. The results,such as power factor and Joule heating power,show reasonable correlation with experimental data,and Joule heating rate reaches the maximum at the corners and the minimum at the centre of the cross-section area. With increasing relative permeability of iron core,length of coils,current frequency and resistivity of metal melt,the power factor and Joule heating power change. It is concluded that current frequency,the resistivity and length of the coil play a critical role in determining the power factor and Joule heating power,whereas relative permeability of the magnetic core shows no significant influence on them.展开更多
The aim of this work is to propose a 3D FE model of a theoretical assembling straight bevel gear pair to analyze the contact fatigue on the tooth surface and the bending fatigue in the tooth root. Based on the cumulat...The aim of this work is to propose a 3D FE model of a theoretical assembling straight bevel gear pair to analyze the contact fatigue on the tooth surface and the bending fatigue in the tooth root. Based on the cumulative fatigue criterion and the stress-life equation, the key meshing states of the gear pair were investigated for the contact fatigue and the bending fatigue. Then, the reliability of the proposed model was proved by comparing the calculation result with the simulation result. Further study was performed to analyze the variation of the contact fatigue stress and the bending fatigue stress under different loads. Furthermore, the roles of the driving pinion and the driven gear pair were evaluated in the fatigue life of the straight bevel gear pair and the main fatigue failure mode was determined for the significant gear. The results show that the fatigue failure of the driving pinion is the main fatigue failure for the straight bevel gear pair and the bending fatigue failure is the main fatigue failure for the driving pinion.展开更多
文摘中国脱贫攻坚事业一直受到国外媒体的广泛关注。本研究选取NOW(News on the Web)网络新闻语料库中2011年12月至2022年1月共91篇国外有关中国扶贫报道话语的语料,以Fairclough三维分析模型为理论框架,从文本、话语实践和社会实践三个层面详细论述欧美西方国家、非洲国家以及南亚、东南亚国家相关新闻报道的不同焦点和背后的意识形态呈现模式。研究发现,在有关脱贫攻坚的报道中,西方媒体偏重于中国政治主题,非洲媒体更多赞扬中国扶贫成就、国际合作和经验分享,而东南亚媒体侧重扶贫在农业及经济方面的进展。通过考察不同国家和地区对中国减贫治理的认知态度,以期为中国扶贫话语体系建构提供借鉴,实现对外话语的精准化和差异化传播。
基金Project(50876116) supported by the National Natural Science Foundation of ChinaProject(2007CK3077) supported by Innovative Program of Hunan Science and Technology AgencyProject(1343-77225) supported by the Graduate School of Central South University
文摘In order to investigate Joule heating power,a three-dimensional finite element model(FEM) was developed to predict Joule heating power in the channels of double-loop inductor. The simulated results were compared with experimental data from low load trials for a 400 kW inductor. The results,such as power factor and Joule heating power,show reasonable correlation with experimental data,and Joule heating rate reaches the maximum at the corners and the minimum at the centre of the cross-section area. With increasing relative permeability of iron core,length of coils,current frequency and resistivity of metal melt,the power factor and Joule heating power change. It is concluded that current frequency,the resistivity and length of the coil play a critical role in determining the power factor and Joule heating power,whereas relative permeability of the magnetic core shows no significant influence on them.
基金Project(51105287) supported by the National Natural Science Foundation of ChinaProject(2012BAA08003) supported by the Key Research and Development Project of New Products and New Technologies of Hubei Province, ChinaProject(2011-P05) supported by the State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology,China
文摘The aim of this work is to propose a 3D FE model of a theoretical assembling straight bevel gear pair to analyze the contact fatigue on the tooth surface and the bending fatigue in the tooth root. Based on the cumulative fatigue criterion and the stress-life equation, the key meshing states of the gear pair were investigated for the contact fatigue and the bending fatigue. Then, the reliability of the proposed model was proved by comparing the calculation result with the simulation result. Further study was performed to analyze the variation of the contact fatigue stress and the bending fatigue stress under different loads. Furthermore, the roles of the driving pinion and the driven gear pair were evaluated in the fatigue life of the straight bevel gear pair and the main fatigue failure mode was determined for the significant gear. The results show that the fatigue failure of the driving pinion is the main fatigue failure for the straight bevel gear pair and the bending fatigue failure is the main fatigue failure for the driving pinion.
