期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
大型40Cr13环件径-轴向轧制进给曲线设计方法研究
1
作者 史志起 丁浩 +4 位作者 时礼平 魏伟 李蒙 王涛 成思福 《塑性工程学报》 CAS CSCD 北大核心 2023年第11期54-59,共6页
为满足实际生产需求,保障环件在实际轧制过程中的稳定性及产品质量统一,根据大型40Cr13环件塑性变形特点,在传统轧制曲线的基础上规划了五段式轧制曲线,并根据实际生产经验提出了各阶段的芯辊进给量Δb_i,再结合环件咬入条件、锻透条件... 为满足实际生产需求,保障环件在实际轧制过程中的稳定性及产品质量统一,根据大型40Cr13环件塑性变形特点,在传统轧制曲线的基础上规划了五段式轧制曲线,并根据实际生产经验提出了各阶段的芯辊进给量Δb_i,再结合环件咬入条件、锻透条件及环件直径增大速度等公式提出了各阶段芯辊进给速度V_i的计算方法,从而得出了五段式轧制曲线设计方法。选择实际订单要求尺寸设计了五段式轧制曲线,通过有限元模拟方式分析了轧制后环件精度、温度和应变分布,均能满足实际生产要求,从而验证了五段式轧制曲线的合理性。 展开更多
关键词 大型40Cr13 轧制曲线 设计方法 环件质量
下载PDF
Mobile Interaction Capturing System in Real Environments
2
作者 Ivan Pretel Garcia Ana B. Lago Vilarino 《Computer Technology and Application》 2012年第8期533-543,共11页
Mobile applications are being used in a great range of fields and application areas. As a result, many research fields have focused on the study and improvement of such devices. The current Smartphones are the best ex... Mobile applications are being used in a great range of fields and application areas. As a result, many research fields have focused on the study and improvement of such devices. The current Smartphones are the best example of the research and the evolution of these technologies. Moreover, the software design and development is progressively more focused on the user; finding and developing new mobile interaction models. In order to do so, knowing what kind of problems the users could have is vital to enhance a bad interaction design. Unfortunately, a good software quality evaluation takes more time than the companies can invest. The contribution revealed in this work is a new approach to quality testing methodology focused on mobile interactions and their context in use where external capturing tools, such as cameras, are suppressed and the evaluation environments are the same as the user will use the application. By this approach, the interactions can be captured without changing the context and consequently, the data will be more accurate, enabling the evaluation of the quality-in-use in real environments. 展开更多
关键词 Human computer interaction quality in use mobile services context-awareness.
下载PDF
An Analysis of Wetland Degradation in the Dimoria Region of Assam, India
3
作者 Dharma Ram Deka Pradip Sharma 《Journal of Life Sciences》 2013年第7期781-786,共6页
The wetlands of the Brahmaputra valley include lake-like natural water bodies locally known as 'beel', and degenerated lakes, which are often called as swamps. The role of such wetlands in socio-economic condition o... The wetlands of the Brahmaputra valley include lake-like natural water bodies locally known as 'beel', and degenerated lakes, which are often called as swamps. The role of such wetlands in socio-economic condition of the people is significant from various angles. Apart from the wetlands act as the ideal habitats for feeding, nesting and breeding of a large variety of fishes, birds and other aquatic animals, these features maintain the environmental quality of the region. Present study has been conducted primarily in eight selected beels in the Dimoria region, which is located almost at the south-central part of the Brahmaputra valley. The water and soil samples from these wetlands had been collected using random sampling technique and analyzed to know about the nature of degradation of the wetlands. Once highly productive wetland waters now show very low DO, high BOD and COD, indicating dwindling productivity of fish and other aquatic resources. Higher value of pH in soils of most of the wetlands found probably due to the impact of industrial effluents and urban sewage and use of chemical fertilizers in the paddy field of the fringe areas, which again create toxic environment and ultimately reduces fish productivity. 展开更多
关键词 Brahmaputra valley beel dimoria environmental quality fish productivity.
下载PDF
Genetic analysis of land subsidence in Anshan
4
作者 LI Xiaole YANG Zhishuang 《Global Geology》 2010年第3期141-144,共4页
Land subsidence is a complex geological phenomenon which is concerned by the researchers at home and abroad. In this paper,the observation data from Anshan Second Order Leveling during 1987-[KG-*7]-1994,combined with ... Land subsidence is a complex geological phenomenon which is concerned by the researchers at home and abroad. In this paper,the observation data from Anshan Second Order Leveling during 1987-[KG-*7]-1994,combined with the area of environmental engineering geology and geological conditions analysis shows that land subsidence in Anshan City is closely related to active tectonics,Quaternary strata and groundwater exploitation. 展开更多
关键词 land subsidence active tectonics Quaternary strata groundwater exploitation
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部