剃齿时齿形中凹现象的形成机理

本文综合啮合原理、微分几何和弹性力学的基础理论,对剃齿过程中刀具齿面和被剃齿轮齿面间的失配进行了分析。最后利用径向力求出了齿面间的压切量,从而解释并验证了剃齿过程中产生的齿形中凹现象。这对提高剃齿精度、降低噪音有着重要意义。     

全站仪线路纵、横断面测量

运用全站仪放样及对边测量功能，在已知控制点上设站，方便、快捷、精确的进行线路的纵、横断面测量。     

修形ZI蜗轮滚刀齿形合格长度的研究

本文研究了修形ZI蜗轮滚刀齿形误差的计算方法,从理论上分析了滚刀设计参数和铲磨工艺参数对齿形误差的影响,提出了变砂轮中心高铲磨新工艺,为增加滚刀齿形合格长度开辟了新途径．     

A recording phase lag between ocean and continent climate changes: Constrained by the Matuyama/Brunhes polarity boundary

The Matuyama/Brunhes polarity boundary (MBPB) is recorded in Chinese loess L8, which is associated with the glacial period. It is proved that loess L8 is capable of recording earth’s secular variation, and the lock-in depth in Chinese loess is no more than that of marine sediments. Comparison with the location of MBPB in Chinese loess and marine sediments, it is put forward that there is a recording phase lag between ocean and continent climate changes.     

Chronology of environmental events over East Asia during the past 130 ka

In the transitional region between the Loess Plateau and deserts, 4 sections located respectively at Yuling, Hengshan, Dingbian and Huining of China are studied. The high-resolution paleoclimatic records obtained show that environmental events on varying time scales have happened over East Asia. These events are dated with the time scales established using the recently-developed approach of Automatic Orbital Tuning. This leads to the establishment of the chronology of the environmental events.     

Shear-wave splitting and anisotropy in crust of Dabieshan orogenic belt

The shear-wave splitting was analyzed on the deep seismic sounding profile crossing the Dabieshan area. The direction difference between Sg and SmS fast wave polarization indicates that the modem regional tectonic stress field in the Dabieshan area exists only in uppcr crust, while the crack alignment caused by the Triassic collision between the North China and the Yangtze blocks had been preserved in mid-lower curst.     

考虑径向流速分布的二维非均相径向氨合成反应器模型

导出了考虑床层径向流速分布的径向床二维非均相模型,通过计算模拟考察了不均匀流动对三段径向冷激式氨合成塔性能的影响。计算表明：在各种不同的床层进口温度、入口氨浓度和活性系数下,流动的不均匀度所造成的影响是不同的,提高进口温度,降低入口氨浓度和提高活性系数有利于降低流动不均匀对三段径向合成塔净值和生产能力的影响是有限的,在计算条件下,均匀流动和不均匀度高达７０％相比,生产能力只下降了２％。     

水泥黄土增强措施初探

在分析资料和室内试验的基础上,概括了提高水泥黄土强度有效措施,就水泥黄土硬化和外加剂对水泥黄土的作用机理进行了初步探讨。     

中国黄土区东亚古季风气候与冰期气候对比研究

研究了中国黄土区冰期气候与季风气候记录;进行了黄土磁化率与大洋δ１８Ｏ曲线对比,并且将黄土组合—古土壤组合与冰期－间冰期气候进行了比较。结果表明：黄土组合与古土壤组合记录了冰期气候与间冰期气候;中国黄土—古土壤堆积是全球冰期—间冰期气候变化与东亚古季风气候变化共同作用的结果。     

摆动凸轮廓线曲率半径计算的CAD动画方法

通过瞬心法进行高副低代,得到了摆动从动件凸轮机构的等效四杆机构;在此基础上,论述了凸轮廓线曲率半径图解法的原理,给出了它们之间的几何运动关系。进一步讨论了采用CAD动画的方法,高速高精度地计算凸轮廓线曲率半径的过程。