室温固相反应法制备纳米氧化锆及表征

以ZrOCl2.8H2O和NH4HCO3为原料,在适量表面活性剂(PEG-400)存在下,先在室温下充分混合研磨进行固相反应,得到的反应混合物再用水洗去其中的可溶性无机盐并烘干,即得氧化锆前驱体。前驱体经530℃下热解3h即得氧化锆产品,采用TG/DTA,XRD和TEM对前驱体及产品进行了表征。结果表明,所得产品氧化锆为结晶良好、以四方相为主的混合晶相,其平均粒径约为25nm。     

四次有理Bézier曲线的形状调整

给出了一种基于权因子调整的四次Bézier 曲线形状控制的有效方法。推导出了曲线肩点的两种新的表达式。这两个表达式对曲线权因子的意义进行了较好的解释,很好地反应出权因子变化对曲线肩点位置的影响。基于这两个表达式,推导出了曲线肩点插值某固定点时各权因子的具体取值公式。最后,实例表明此方法能给曲线形状调整带来实用性指导。     

受限语言子集的理论研究和探索

本文在综述受限语言研究成果的基础上,提出受限语言子集的一种形式化描述模型,并给出其相应的语言特性和数学特性,就受限汉语子集的确定方法问题进行了理论研究和探索。作者希望本文提出的表示模型和确定方法能够引起有关的讨论,并在充分认识受限语言研究的必要性和困难的基础上,将其引向全面深入的发展。     

最小阶时分滤波器及其在运载体对准中的应用

设计一种时分降低滤波器用来进行运载体惯导系统的动态对准和传递对准，假定运载体惯导系统已标定的。在运载体水平直线运动的短时间内，两个二阶滤波以时分工作方式估计平台水平失调角，在消除水平失调角后，运载体在垂直与当地垂线的水平面内机动，此时用一个三阶（或四阶）滤波器来估计方位失调角，另外，在本文中给出该滤波器的数据压缩算法，来提高估计精度。     

在 AUTO CAD 中实现零件轮廓数控自动编程

介绍了在ＡＵＴＯＣＡＤ系统中用ＡＵＴＯＬＩＳＰ语言对图形实现数控铣自动编程的方法，实现图形交互式数控机床自动编程。     

Effect of AlP master alloy on grain refinement of primary silicon in eutectic Al-Si alloys

To obtain the finer primary silicon crystals, the proprietary Al-P master alloy was adopted to modify the eutectic Al-Si alloys and the most suitable modification process was made in the experiments. The SEM (Scanning Electron Microscope) and DSC (Differential Scanning Calorimeter) analysis indicate that the Al-P modifier has more advantages over Cu-P and Fe-P modifier in easily addition, no elemental alteration and less undercooling of primary silicon′s solidification, which suggests the Al-P master alloy is an effective modifier of eutectic Al-Si alloys.     

离心压缩机组冷态找正数据的分析与精确计算

针对在安装引进的离心压缩机组中发现的原机组冷态找正数据与实测值不符的情况，介绍了其试验的方法，并提出了一种行之有效的精确计算方法。用该方法计算了该压缩机组的冷态找正数据，并与实测数据作了比较。从而证明该计算方法的可行性及正确性。     

Temperature Induces Self-assembly of Silicon Nano/Micro-structure based on Multi-physics Approach

A three-dimensional dynamic model for nano/micro-fabrications of silicon was presented. With the developed model, the fabrication process of silicon on nothing (SON) structure was quantitatively investigated. We employ a diffuse interface model that incorporates the mechanism of surface diffusion. The mechanism of the fabrication is systematically integrated for high reliability of computational analysis. A semi-implicit Fourier spectral scheme is applied for high efficiency and numerical stability. Moreover, the theoretical analysis provides the guidance that is ordered by the fundamental geometrical design parameters to guide different fabrications of SON structures. The performed simulations suggest a substantial potential of the presented model for a reliable design technology of nano/micro-fabrications.