Cultural education is closely related to individual development and the needs for economic,social,and technological development,which,while aiming at improving students’overall professionalism,respects their subjecti...Cultural education is closely related to individual development and the needs for economic,social,and technological development,which,while aiming at improving students’overall professionalism,respects their subjective consciousness and initiative,highlights the development of personality and individual potential,and designs and improves educational activities that are characterized by cultivating people’s ability to make innovation,start a business,and form a healthy personality.Taking problems existing in the cultural education in vocational colleges as the cutin point,this paper explored the inner driving force of cultural education in the new era and tried to discuss the concept,objectives,content and mechanism of cultural education by pivoting to individual autonomy,expertise,and development goals,with the hope that the inner driving force of cultural education could be effectively carried out.展开更多
A rotary swaging machine was applied to fabricating pipe reduction for miniature inner grooved copper tube （MIGCT） heat pipes. Compared with conventional swaging method, the axial feed of the designed rotary swaging...A rotary swaging machine was applied to fabricating pipe reduction for miniature inner grooved copper tube （MIGCT） heat pipes. Compared with conventional swaging method, the axial feed of the designed rotary swaging machine was reached by a constant pushing force. The deformation of grooves in pipe reduced section during rotary swaging was analyzed. The shrinkage and extensibility of pipe reduction were measured and calculated. Furthermore, four aspects, including outer diameter, surface roughness, extensibility and processing time of pipe reduction, which were influenced by the pushing force, were considered. The results show that the tube wall thickness increases gradually along the z-axis at sinking section. However, the outer diameters, surface roughness and micro-cracks at reduced section tend to decrease along the z-axis. Besides, the effect of variation in the pushing force on the extensibility is limited while an increase in the pushing force results in a decrease of surface roughness. Therefore, a large pushing force within the limit is beneficial to pipe reduction manufacturing during rotary swaging process.展开更多
The grassland of Qinghai-Tibet Plateau (QTP) and Inner Mongolia Plateau (IMP), accounting for 73.9% of the total grassland area in China, is significant to food and ecological safety. Due to climate change and irratio...The grassland of Qinghai-Tibet Plateau (QTP) and Inner Mongolia Plateau (IMP), accounting for 73.9% of the total grassland area in China, is significant to food and ecological safety. Due to climate change and irrational human activities, grasslands on the two plateaus have severely degraded over recent decades. Understanding the dynamic changes of grassland and its driving forces is necessary to make effective measurements to prevent grassland degradation. Here, we selected the net primary productivity (NPP) as an indicator to quantitatively assess the dynamic variation of grassland and the relative roles of climate change and human activities on QTP and IMP from 2000 to 2016. The results found significant spatial variability of grassland on QTP. 28.3% of the grassland experienced degradation and was mainly distributed in the southern QTP, versus 71.7% of the grassland was restored and mainly distributed in the central and northern QTP. In contrast, grassland on IMP didn’t show significant spatial variability. Most of the grassland on IMP was restored during the study period. Climate change (i.e. increased precipitation) was the dominant factor and could explain 72.8% and 84.4% of the restored grassland in QTP and IMP. Irrational human activities (i.e. overgrazing) were the main driving factors and could explain 72.9% and 100.0% of the degraded grassland on the two plateaus during the study period. Ecological restoration projects were favorable for grassland restoration on the two plateaus, and they contributed to 27.2% and 15.6% of the restored grassland in QTP and IMP, respectively. Therefore, climate changes on IMP were more favorable for grassland restoration, and human activities have a greater impact on the grassland variation on QTP.展开更多
The cyclic symmetry and local fine-mesh technology were adopted in the establishment of numerical simulation model for inner gear spin-forming. And the processing experiment was proceeded to verify the reliability of ...The cyclic symmetry and local fine-mesh technology were adopted in the establishment of numerical simulation model for inner gear spin-forming. And the processing experiment was proceeded to verify the reliability of the established model. The simulation result indicates that besides radial and axial flows, there also exists rather large tangential flow, which results in an increase of forming force in tangential direction. Furthermore, the un-uniform deformation of metal during spin-forming would cause forming defects, such as underfill in tooth fillet region and indentation on the outside spun part.展开更多
[目的]分析内蒙古通辽市土地利用变化及其驱动力,为该地区经济建设、土地可持续发展提供科学依据。[方法]基于通辽市1980—2020年8期土地利用数据及统计年鉴数据,采用土地利用动态度、土地利用程度、土地利用转移矩阵和主成分分析方法...[目的]分析内蒙古通辽市土地利用变化及其驱动力,为该地区经济建设、土地可持续发展提供科学依据。[方法]基于通辽市1980—2020年8期土地利用数据及统计年鉴数据,采用土地利用动态度、土地利用程度、土地利用转移矩阵和主成分分析方法对通辽市土地利用变化特征及其驱动力进行研究分析。[结果]通辽市1980—2020年土地利用以耕地和草地为主,耕地总面积增加了3037 km 2,整体增幅为20.48%,草地总面积减少了2922 km^(2),整体减幅为10.40%。建设用地面积在40 a间持续增加,其单一土地利用动态度最大。土地利用程度综合指数处在中低等水平,由于研究期间综合指数变化率为正值,整体上处于上升发展期。研究期间内草地主要转化为耕地、林地、建设用地及未利用土地。通辽市土地利用变化的社会经济驱动力以经济发展水平、农业发展水平、社会富裕程度和产业结构为主,人口的影响次之。气候驱动因素方面主要是年平均气温和年降水量的影响较为显著。[结论]1980—2020年通辽市土地利用空间上存在明显异质性,土地利用变化速度趋于稳定,土地利用水平不断提高,土地利用转换愈加频繁,社会经济和气候因素对土地利用变化有正向显著作用,整体上不断促进该地区经济建设和土地可持续发展。展开更多
文摘Cultural education is closely related to individual development and the needs for economic,social,and technological development,which,while aiming at improving students’overall professionalism,respects their subjective consciousness and initiative,highlights the development of personality and individual potential,and designs and improves educational activities that are characterized by cultivating people’s ability to make innovation,start a business,and form a healthy personality.Taking problems existing in the cultural education in vocational colleges as the cutin point,this paper explored the inner driving force of cultural education in the new era and tried to discuss the concept,objectives,content and mechanism of cultural education by pivoting to individual autonomy,expertise,and development goals,with the hope that the inner driving force of cultural education could be effectively carried out.
基金Project (U0834002) supported by the Key Program of NSFC Guangdong Joint Funds of ChinaProjects (51005079, 20976055) supported by the National Natural Science Foundation of China+1 种基金Project (10451064101005146) supported by the Natural Science Foundation of Guangdong Province, ChinaProject (20100172120001) supported by Specialized Research Fund for the Doctoral Program of Higher Education, China
文摘A rotary swaging machine was applied to fabricating pipe reduction for miniature inner grooved copper tube （MIGCT） heat pipes. Compared with conventional swaging method, the axial feed of the designed rotary swaging machine was reached by a constant pushing force. The deformation of grooves in pipe reduced section during rotary swaging was analyzed. The shrinkage and extensibility of pipe reduction were measured and calculated. Furthermore, four aspects, including outer diameter, surface roughness, extensibility and processing time of pipe reduction, which were influenced by the pushing force, were considered. The results show that the tube wall thickness increases gradually along the z-axis at sinking section. However, the outer diameters, surface roughness and micro-cracks at reduced section tend to decrease along the z-axis. Besides, the effect of variation in the pushing force on the extensibility is limited while an increase in the pushing force results in a decrease of surface roughness. Therefore, a large pushing force within the limit is beneficial to pipe reduction manufacturing during rotary swaging process.
文摘The grassland of Qinghai-Tibet Plateau (QTP) and Inner Mongolia Plateau (IMP), accounting for 73.9% of the total grassland area in China, is significant to food and ecological safety. Due to climate change and irrational human activities, grasslands on the two plateaus have severely degraded over recent decades. Understanding the dynamic changes of grassland and its driving forces is necessary to make effective measurements to prevent grassland degradation. Here, we selected the net primary productivity (NPP) as an indicator to quantitatively assess the dynamic variation of grassland and the relative roles of climate change and human activities on QTP and IMP from 2000 to 2016. The results found significant spatial variability of grassland on QTP. 28.3% of the grassland experienced degradation and was mainly distributed in the southern QTP, versus 71.7% of the grassland was restored and mainly distributed in the central and northern QTP. In contrast, grassland on IMP didn’t show significant spatial variability. Most of the grassland on IMP was restored during the study period. Climate change (i.e. increased precipitation) was the dominant factor and could explain 72.8% and 84.4% of the restored grassland in QTP and IMP. Irrational human activities (i.e. overgrazing) were the main driving factors and could explain 72.9% and 100.0% of the degraded grassland on the two plateaus during the study period. Ecological restoration projects were favorable for grassland restoration on the two plateaus, and they contributed to 27.2% and 15.6% of the restored grassland in QTP and IMP, respectively. Therefore, climate changes on IMP were more favorable for grassland restoration, and human activities have a greater impact on the grassland variation on QTP.
基金Support by National Natural Science Foundation of China (50475097)Provincial Natural Science Foundation of Guangdong (04105943)Industrial Science and Technology Development Program Foundation of Guangdong (600611901001)
文摘The cyclic symmetry and local fine-mesh technology were adopted in the establishment of numerical simulation model for inner gear spin-forming. And the processing experiment was proceeded to verify the reliability of the established model. The simulation result indicates that besides radial and axial flows, there also exists rather large tangential flow, which results in an increase of forming force in tangential direction. Furthermore, the un-uniform deformation of metal during spin-forming would cause forming defects, such as underfill in tooth fillet region and indentation on the outside spun part.
文摘[目的]分析内蒙古通辽市土地利用变化及其驱动力,为该地区经济建设、土地可持续发展提供科学依据。[方法]基于通辽市1980—2020年8期土地利用数据及统计年鉴数据,采用土地利用动态度、土地利用程度、土地利用转移矩阵和主成分分析方法对通辽市土地利用变化特征及其驱动力进行研究分析。[结果]通辽市1980—2020年土地利用以耕地和草地为主,耕地总面积增加了3037 km 2,整体增幅为20.48%,草地总面积减少了2922 km^(2),整体减幅为10.40%。建设用地面积在40 a间持续增加,其单一土地利用动态度最大。土地利用程度综合指数处在中低等水平,由于研究期间综合指数变化率为正值,整体上处于上升发展期。研究期间内草地主要转化为耕地、林地、建设用地及未利用土地。通辽市土地利用变化的社会经济驱动力以经济发展水平、农业发展水平、社会富裕程度和产业结构为主,人口的影响次之。气候驱动因素方面主要是年平均气温和年降水量的影响较为显著。[结论]1980—2020年通辽市土地利用空间上存在明显异质性,土地利用变化速度趋于稳定,土地利用水平不断提高,土地利用转换愈加频繁,社会经济和气候因素对土地利用变化有正向显著作用,整体上不断促进该地区经济建设和土地可持续发展。
