随着iphone、Android等智能设备的迅速普及,移动Web技术逐渐成为关注的新热点,传统信息类和电子商务网站因市场需求向移动终端转移。由于传统网站在终端不能很好地适应,移动Web开发逐渐成为一门热门学科。JQuery Mobile 1.2正式版于2012...随着iphone、Android等智能设备的迅速普及,移动Web技术逐渐成为关注的新热点,传统信息类和电子商务网站因市场需求向移动终端转移。由于传统网站在终端不能很好地适应,移动Web开发逐渐成为一门热门学科。JQuery Mobile 1.2正式版于2012年10月正式发布,其具有上手迅速并支持快速迭代、支持跨平台和跨设备开发等优点,将会成为移动Web开发中UI开发的主流框架。通过对JQuery Mobile 1.2的主要特性、易用性、支持的平台的了解,可以明确该框架的适用范围。掌握页面、对话框、工具栏、按钮、内容格式化、表单元素、列表、API等主要内容后,可以快速制作出实用且漂亮的移动Web页面。展开更多
To measure the surface flow in a physical river model, an improved system of Large-Scale Particle Tracking Velocimetry （LSPTV） was proposed and the elements of the PTV system were described. Usually the tracer parti...To measure the surface flow in a physical river model, an improved system of Large-Scale Particle Tracking Velocimetry （LSPTV） was proposed and the elements of the PTV system were described. Usually the tracer particles of a PTV system seeded on water surface tend to form conglomerates due to surface tension of water. In addition, they can not float on water surface when water flow is shallow. Ellipsoid particles were used to avoid the above problems. Another important issue is particle recognition. In order to eliminate the influence of noise, particles were recognized by the processing of multi-frame images. The kernel of the improved PTV system is the algorithm for particle tracking. A new 3-frame PTV algorithm was developed. The performance of this algorithm was compared with the conventional 4-frame PTV algorithm and 2-frame PTV algorithm by means of computer simulation using synthetically generated images. The results show that the new 3-frame PTV algorithm can recover more velocity vectors and have lower relative error. In addition, in order to attain the whole flow field from individual flow fields, the method of stitching individual flow fields by obvious marks was worked out. Then the improved PTV system was applied to the measurement of surface flow field in Model Yellow River and shows good performance.展开更多
文摘随着iphone、Android等智能设备的迅速普及,移动Web技术逐渐成为关注的新热点,传统信息类和电子商务网站因市场需求向移动终端转移。由于传统网站在终端不能很好地适应,移动Web开发逐渐成为一门热门学科。JQuery Mobile 1.2正式版于2012年10月正式发布,其具有上手迅速并支持快速迭代、支持跨平台和跨设备开发等优点,将会成为移动Web开发中UI开发的主流框架。通过对JQuery Mobile 1.2的主要特性、易用性、支持的平台的了解,可以明确该框架的适用范围。掌握页面、对话框、工具栏、按钮、内容格式化、表单元素、列表、API等主要内容后,可以快速制作出实用且漂亮的移动Web页面。
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 50479068, 50779014)the Technological Innovation Project of Graduate students in Jiangsu Province (Grant No.1306014)the Project of "Six Talent Peak" of Jiangsu Province (Grant No. 07-A-006).
文摘To measure the surface flow in a physical river model, an improved system of Large-Scale Particle Tracking Velocimetry （LSPTV） was proposed and the elements of the PTV system were described. Usually the tracer particles of a PTV system seeded on water surface tend to form conglomerates due to surface tension of water. In addition, they can not float on water surface when water flow is shallow. Ellipsoid particles were used to avoid the above problems. Another important issue is particle recognition. In order to eliminate the influence of noise, particles were recognized by the processing of multi-frame images. The kernel of the improved PTV system is the algorithm for particle tracking. A new 3-frame PTV algorithm was developed. The performance of this algorithm was compared with the conventional 4-frame PTV algorithm and 2-frame PTV algorithm by means of computer simulation using synthetically generated images. The results show that the new 3-frame PTV algorithm can recover more velocity vectors and have lower relative error. In addition, in order to attain the whole flow field from individual flow fields, the method of stitching individual flow fields by obvious marks was worked out. Then the improved PTV system was applied to the measurement of surface flow field in Model Yellow River and shows good performance.
