左岸鹰子咀泵站工程全风化砂围堰

三峡鹰子咀泵站施工围堰是在长江上首次成功采用全风化砂深水填筑。围堰区域地质条件复杂，河床覆盖层深厚，围堰防渗处理采用高压喷射垂直防渗板墙，这些都在我国水电建设史上尚属首例。工程实践表明，设计和施工是成功的，可作为以后类似工程的借鉴。     

关于序列的线性复杂度稳定性

本文利用线性复杂度曲线,讨论了序列的线性复杂度稳定性。     

用包络法测量特型曲面坐标值探讨

本文通过探讨某一叶片截面曲率坐标位置的例题,用圆族方程的球体包络法解决特型曲面的测量     

球形岩屑在赫-巴流体中的沉降速度

钻井时,井眼中的岩屑颗粒在其自重作用下会克服泥浆的阻力而以一定的速度沉降。为了及时有效地将岩屑从井眼中携出,必须使环空中泥浆上返速度大于岩屑的沉降速度。钻井实践及有关实验表明,泥浆的流变性是影响岩屑沉降速度的重要因素,而岩屑沉降速度又是合理确定钻井水力参数及调整泥浆性能不可缺少的依据。因此,深入研究岩屑在环空泥浆中的沉降规律是很重要的。本文将钻井泥浆当作赫-巴流体(Herschel-Bulkley fluid)来处理,应用等效粘度概念,在小雷诺数条件下,探讨了球形岩屑在赫-巴流体中的沉降问题,提出了沉降速度的计算公式,公式反映了泥浆密度、流变参数及岩屑粒径和岩屑密度与沉降速度的关系,得到了当沉降速度为零时的不沉粒径与泥浆性能参数之间的关系式,文中还给出了计算实例。经应用前人资料验证,证明文中理论与实验结果相符。本文的沉降速度公式可供现场计算时参考。     

基于FCM的快速CHT算法在球团矿粒度检测中的应用

文章针对球团这类特殊的不规则球体的粒度检测，提出基于模糊C-均值聚类(FCM)的快速圆霍夫变换(CHT)算法。该算法在保留快速CHT算法优点的基础上，应用模糊C-均值聚类方法实现了对于不规则球体圆心的准确定位问题。实验表明，该算法比快速CHT算法具有更好的效果。     

Spatial Vibration and Its Numerical Analytical Method of Four-high Rolling Mills

The rolls in contemporary four-high mills cannot be maintained parallel during the rolling process. There- fore, four-high rolling mill vibrations take place in six degree of freedom （DOF） leading to spatial behaviors invol- ving vertical, horizontal, axial, torsional, cross and swinging vibration modes resulting in complex relative motions between the rolls. Two numerical methods, modified Riccati-transfer matrix method （Riccati-TMM） and finite ele- ment method （FEM）, are presented to analyze a spatial vibration characteristic of two four-high rolling mills with different stability. The natural frequency and mode shape of four-high rolling mills are obtained, and the clearance has a great effect on natural frequency and mode shape. In addition, field testing experiment is also conducted to measure natural frequency by power spectrum analysis of rolling mill vibration. Experimental results basically agree with those calculated by Riccati-TMM and FEM, which means that the Riccati-TMM and the FEM can be used for analysis of spatial vibration of four-high rolling mill. Meanwhile, the spatial vibration shows more compound vibra- tion behaviors and the negative effect of horizontal, vertical, cross and swinging vibration modes are effectively con- trolled after redesign of rolling mill. These advantages have a great significance for the rolling mill to be operated with a much higher rolling speed and improved yield of products.