三维激光打标机的纹理映射技术研究     

鲁安杰  周泳全  张万军  张松岭 《深圳信息职业技术学院学报》2013,11(1):25-28

在分析国内外任意三维曲面激光打标现状的基础上,通过介绍基于三维激光振镜系统自动变焦原理和面向三维激光打标加工的三维纹理数学模型的生成过程,研究了产品三维stl面展开的纹理映射算法,实现了产品三维曲面无尺寸变形和形状扭曲的激光打标方法。  相似文献   

串行同步双缓冲扫描提高平板显示器的显示亮度和传送利用率   总被引：2，自引：1，他引：2  

陈章进  陈峰  冉峰  徐美华  郑方 《上海大学学报(英文版)》2007,11(3):314-317

This paper presents a serial synchronous scanning mode in flat panel display (FPD) by adding a latch buffer between the serializer and the driving buffer. Comparing with conventional techniques, the proposed structure can efficiently reduce the brightness loss and improve the transmission performance. Theoretical analysis and experimental results show that the ratio between the lightest weight display time and the relative transmission time is a tradeoff between brightness loss and transmission efficiency.  相似文献   

用激光测量轧辊圆柱度误差的研究     

陈完成  赵晓平 《石家庄职业技术学院学报》2008,20(4):38-39

为提高轧机轧辊圆柱度误差测量的精度,简化测量手段,提出了激光测量方案并对测量结果进行了误差分析.采用激光测量轧辊的圆柱度误差精度高,装置简单,测量方便.在测量时选用的狭缝宽度越小,测量精度越高.  相似文献   

在频率分辨光学门法中用矩阵方法回归超短脉冲     

文汝红 《宜春学院学报》2008,30(6)

介绍了频率分辨光学门法（FROG）回归超短脉冲的测量原理和恢复脉冲的二元相位恢复算法。详细介绍了基于矩阵的广义主元素投影法,对广义投影法和基于矩阵的广义主元素投影法进行了比较,数值模拟了超短脉冲的二次谐波型频率分辨光学门（SHG-FROG）迹线,用两种投影法从迹线中恢复了脉冲的振幅和相位。结果表明,两种方法都能很好地回归超短脉冲,但基于矩阵的广义主元素投影法运算时间短。  相似文献   

Three-dimensional tracking of GLUT4 vesicles in TIRF microscopy     

Xiang-ping Wu  Jie-yue Li  Ying-ke Xu  Ke-di Xu  Xiao-xiang Zheng 《浙江大学学报(A卷英文版)》2008,9(2):232-240

TIRF microscopy has provided a means to view mobile granules within 100 nm in size in two dimensions. However quantitative analysis of the position and motion of those granules requires an appropriate tracking method. In this paper, we present a new tracking algorithm combined with the unique features of TIRF. Firstly a fluorescence correction procedure was processed to solve the problem of fluorescence bleaching over time. Mobile granules were then segmented from a time-lapse image stack by an adaptive background subtraction method. Kalman filter was introduced to estimate and track the granules that allowed reducing searching range and hence greater reliability in tracking process. After the tracked granules were located in x-y plane, the z-position was indirectly inferred from the changes in their intensities. In the experiments the algorithm was applied in tracking GLUT4 vesicles in living adipose cells. The results indicate that the algorithm has achieved robust estimation and tracking of the vesicles in three dimensions.  相似文献   

Microstructure of ferrospheres in fly ashes: SEM, EDX and ESEM analysis     

Qing-feng Xue  Sheng-gao Lu 《浙江大学学报(A卷英文版)》2008,9(11):1595-1600

Ferrospheres in fly ashes from a coal-fired power plant were extracted by a magnetic separation technique and their microstructure was studied by scanning electron microscopy （SEM）, energy dispersive X-ray analysis （EDX） and environmental scanning electron microscopy （ESEM）. Ferrospheres in fly ashes show significant iron enrichment compared to their respective fly ashes. Iron oxides in ferrospheres mainly occur as minerals magnetite （Fe3O4） and hematite （α-Fe2O3）, which are derived mainly from the decomposition and oxidation of iron-bearing minerals in coal during combustion. EDX data indicate that ferrospheres also contain Si, S, Al and Ca resulting from quartz, mullite, anhydrite and amorphous materials. A large percentage of ferrospheres are commonly 5-50 μm in size. The microstructure of ferrospheres includes smooth, polygonal, dendritic, granular and molten drop characteristics. SEM coupled with EDX provided fast and accurate results of the microstructure and chemical composition of ferrospheres, and helped us to assess environmental issues related to the disposal and utilization of fly ashes.  相似文献   

大菜粉蝶颗粒体病毒(pbGV)包涵体蛋白mRNA的提取及电镜观察     

游哲  李维琪 《中国科学院研究生院学报》1992,(2)

包涵体蛋白 mRNA 是大菜粉蝶颗粒体病毒(pbGV)感染晚期合成的主要信使 RNA.我们从染病晚期幼虫脂肪体中,用饱和苯酚法提取总核酸,用 LiCl 去除其中 DNA,经 Oligo-(dT)纤维素层析柱,mRNA 呈现二个洗脱峰,将洗脱峰组份用尿素-高甲酰胺法制样电镜观察.电镜下 mRNA 分子柔软、粗糙,呈弯曲的线状,分子长度约0.3μ(30个统计)  相似文献   

“V完了”和“V好了”的替换条件及其理据——兼谈“终结图式”的调控和补偿机制   总被引：3，自引：0，他引：3  

陈忠 《中国语文》2008,(2)

V完了和V好了都表示终结,但各自对应的图式以及扫描方式和价值取向有所不同。在渐进性特征受到削弱的情况下,V完了会采取特定的自我调节机制,借助受事的增量加以补偿调控,以确保其渐进性特征保持在正常水准,从而对其句法分布以及变换和替换条件形成不同限制。  相似文献   

利用激光杠杆测定金属线胀系数   总被引：1，自引：0，他引：1  

罗颖  周文龙 《赣南师范学院学报》2008,29(3):135-136

介绍了用激光杠杆测定金属线胀系数的原理和方法.该方法简化了实验设备,且易于操作.  相似文献   

拉式激光散斑干涉测量加载仪     

梁德富  朱俊  梁雅庭 《实验室研究与探索》2008,27(1):42-43

将激光散斑干涉测量纳入大学物理实验,其中关键性障碍是拉式加载仪的制作。通过球面拉杆、球面滑块和定滑轮的结合,能成功地将待测试件的准铅直度固定下来,并消除了因加载而造成的待测试件的晃动,从而解决了拉式加载仪的最大技术难题,该项成果已获国家发明专利授权。  相似文献