三维激光扫描系统的应用研究   总被引：3，自引：0，他引：3  

范海英 《辽宁科技学院学报》2009,11(2):34-35

本文就三维激光扫描成像系统的原理和发展趋势做了简要的叙述,以工程应用实例对三维激光扫描成像系统的工作流程和三维建模做了详细的说明,并对三维激光扫描系统采集的点云数据处理的方法和手段进行了研究。  相似文献   

一种C波段宽带二维扫描固态有源相控阵天线设计与实现     

孙慧峰  邓云凯  雷宏  焦军军  石力 《中国科学院大学学报》2012,(2):282-287

基于机载合成孔径雷达系统的具体应用,给出一种C波段宽带二维扫描固态有源相控阵天线的设计与实现方案. 该天线辐射阵面采用双层矩形微带贴片,由宽带偶极子激励. 通过增加金属隔墙和金属接地螺钉的加载来降低天线单元间互耦,实现了宽带二维相控扫描. 测试结果表明,辐射单元阵中驻波带宽(VSWR<1.6) 达到800 MHz(相对带宽约15%).  相似文献   

量热和热分析在生物大分子体系研究中的应用     

周晓蕾  刘京生  王保怀  李芝芬 《保定师专学报》2002,15(2):41-44

讨论了差示扫描量热法(DSC)和等温滴定量热法(ITC)用于生物大分子体系研究所得到的一些实验结果。内容包括了沙冬青抗冻蛋白热滞活性的测定、胶束解体浓度的确定二个方面内容。所有研究结果都给出了有关生物大分子变化的明确信息和确切结论。  相似文献   

Parallel Spectral-Domain Optical Coherence Tomography for Non-Scattering Object Imaging     

李刚 任钊吴开杰  张泰石林凌 《天津大学学报(英文版)》2007,13(2):107-112

The parallel spectral-domain optical coherence tomography(PSDOCT) is described for high-speed optical coherence tomography(OCT) without lateral scanning. In this setup, the self-elimination of auto-correlation(AC) interference algorithm was used for eradicating the AC interference and ghost images. However, when performed in free space OCT, this algorithm still generated a weak DC component. The algorithm was improved by adding the background intensity part to compensate for the mutual interference between object and reference arms. The results demonstrate that the DC component can be eradicated. Compared with conventional OCT and complex Fourier-domain optical coherence tomography, the advantages of PSDOCT with the improved algorithm in free space are that it has no moving parts to generate consecutive phase shift, the structure of the object can be reconstructed immediately and automatically, and the speed is approximately 16 times faster than those of the other two in the same case.  相似文献   

Structure characterization for the geopolymer of sodium silicate and metakaolin     

曹德光 《重庆大学学报(英文版)》2005,4(2):70-73

1 Introduction 1 During the last decade a new kind of material called geopolymer has emerged as a viable alternative for many conventional cements and plastics. Geopolymer is inorganic polymer derived from metakaolin and sodium silicate solution. It can be synthesized at low temperature and have useful properties such as high compressive strength. It is stable at temperatures up to 800 °C and even 1150 °C while ordinary Portland cement loses its strength at 500 °C [1]. Several microstruct…  相似文献   

光泵磁共振实验评述     

王书运 《实验技术与管理》2007,24(11):35-38

对光磁共振实验的主要内容进行了系统的评述，包括实验中水平方向的磁场、光抽运信号的变化、光泵磁共振信号观察时光抽运信号混杂出现和谐波共振的情况、gF因数的测量方法，以及用光磁共振和光抽运信号测地磁场的方法。  相似文献   

一种基于零树的树形扫描图像压缩编码方法   总被引：1，自引：0，他引：1  

金彩虹 《宁夏师范学院学报》2004,25(6):7-10

嵌入式零树编码被认为是目前国际上最先进的图像编码方法之一，但该算法在编“孤立零”码时会造成比特位冗余．因此本文提出了基于零树的树形扫描的图像压缩编码方法．实验结果表明该方法在保证恢复图像具有良好视觉效果的前提下，提高了压缩比，缩短了编码时间．  相似文献   

自制扫描隧道显微镜探针尖的比较研究     

王晓秋  苏杰 《大连大学学报》2012,(6):1-4

探针对扫描隧道显微镜成像起至关重要的作用。本文分别对电化学腐蚀法自制的钨丝探针和剪切法制得的铂铱探针进行扫描光栅图像比较分析。结果表明,相比铂铱探针,钨丝探针虽然制备繁琐,反应条件不易控制,但是尖锐轴对称形的钨丝探针扫描样品形貌更加细微,用作扫描隧道显微镜探针时扫描成像质量高。该研究为扫描隧道显微镜探针的选用提供了依据。  相似文献   

车载卫星天线扫描与跟踪系统设计     

魏华  陈淡 《闽江学院学报》2012,33(2):61-64

首先从车载天线接收系统总体设计方案进行阐述,给出了相应的系统框图,进而在论述中规划了车栽卫星天线接收主控系统的硬件设计模块．接着研究分析了此次硬件设计中使用到的接口：SPI、TWI、USART,完成了MEGA64主控模块的硬件设计,并给出系统板的原理图,最后,给出了车载卫星天线扫描跟踪算法设计．  相似文献   

Eponyms,Inventions and Devisers: A Contest     

《Journal of Interlibrary Loan, Document Delivery & Electronic Reserve》2013,23(4):73-74

ABSTRACT

In the summer of 1998, the University of North Carolina at Chapel Hill conducted a pilot project for electronic reserves using Contec North America's ‘C3’ e-reserve system. This paper discusses how the pilot project was implemented, including equipment required for the system, types of materials placed on reserve, and problems encountered and solved. It also examines the areas that will determine the future of e-reserves at UNC-CH, copyright management, web access, and the incorporation of multi-media and online articles.  相似文献