高程异常曲面拟合及规则格网内插研究

介绍了部分高程异常拟合的方法,结合一个具体的实例,在2 km×2 km的小范围内采用多项式拟合的方法进行高程异常曲面的逼近,运用GPS水准获得的数据进行拟合检查,通过分析,应该采用五参数拟合的方法,并取得了3.8 cm的精度;并据此拟合多项式进行高程异常规则格网内插分析,运用MATLAB编写程序对几种插值方法进行讨论,最后得到一些实用的结论.     

基于几何特征的人脸定位算法的改进

针对鼻子在照片中往往因与脸部皮肤的对比太不强烈而根本不出现在二值化图像中这一问题,在原有几何匹配算法的基础上给出了鼻子的评价函数,得到了鼻子标记的定位算法,从而提高了人脸定位的精度。     

Molecular simulation study on the effect of trapped charges on ferroelectric switching in β-phase PVDF crystals

Based on the energy-minimization method in molecular simulation, the effect of trapped charges on ferroelectric switching in β-phase PVDF Crystals was investigated. Our simulation indicated that the barrier height, caused by quasi-hexagonal-symmetry lattice field, was too low to well stabilize the orientations of molecular dipoles. However, the interaction between trapped charges and molecular chains would greatly increase the barrier height to build up a much more steady polarization state.     

双向球磨超细粉碎技术及设备研究

报导了制备超细金属粉、片状金属粉的新设备新工艺，研究表明，采用双向旋转球磨粉碎设备，辅以合适的粉碎工艺，把金属粉粉碎到3μm以下且成片状化是完全可能的。设备结构简单，占地面积小，能耗低，生产效率高，完全可以工业化生产。另外，还可对多种粉体进行混合与均化及表面改性处理。     

K403合金高温低周应变疲劳寿命预测方法研究

对材料K403进行700℃应变控制的低周疲劳试验.用Manson-Coffin方程进行数据处理,并对该材料700℃时的低周疲劳寿命进行预测.针对在用Manson-Coffin方程进行数据处理时出现负的塑性应变和寿命预测结果不理想的情况,提出一种基于应力疲劳和Manson-Coffin方程的等温低周应变疲劳寿命预测方法,并用该方法对材料K403在700℃时的低周疲劳数据进行处理,得到寿命预测方程.通过寿命预测发现,该方法得到的寿命预测方程不仅使试验数据得到充分的利用,而且寿命预测能力较Manson-Coffin方程的寿命预测能力有明显提高.     

SuperMap Deskpro5．0在遥感土地利用调查中的应用

利用SuperMapDeskpro5．0的数据集转换功能和导出数据格式多样化的特点,将遥感影像矢量化,并结合外挂南方CASS5．0的AutoCAD2002和MicrosoftAccess对区域土地利用现状图进行高精度数字化。     

Modeling and simulation of residual stresses during glass bulb pressing process

The residual stresses accumulated in the forming process have great effects on the product quality of the glass bulb. Based on the characteristics analysis of glass bulb forming, a mathematical model has been established for calculating residual stresses of glass pressing process. The material is assumed as thermorheologi-cally simple thermoviscoelastic material, and the flow-induced stress is neglected. The consequences of equilibrium and compatibility equations are discussed in detail, and the boundary conditions are specified for various stages of the forming process. The numerical solution is based on the theory of thin layers, combined with finite difference method in the time and layer difference in the thickness di-rection. The presented model and solution method could easily be extended to general pressing process of glass, and applied to problems relative to glass pressing, providing extensive reference values.