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polynomial curve fitting method for refraction-angle extraction in diffraction enhanced imaging

Chinese Physics C 2009年第11期33卷 969-974页

作者：陈志强丁飞黄志峰张丽尹红霞王振常朱佩平 Department of Engineering Physics Tsinghua University Key Laboratory of Particle & Radiation Imaging(Tsinghua University)Ministry of Education Medical Imaging Center Beijing Tongren Hospital Capital Medical University Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences

X-ray diffraction sorbing low-Z sample. How enhanced imaging （DEI） is applied to extract phase information from to inspect internal structures of weakly abraw images measured in different positions of rocking curve is the key problem of DEI. In this paper, we present an effective extraction method called polynomial curve fitting method, in order to extract accurate information angular in a fast speed. It is compared with the existing methods such as multiple-images statistical method and Gaussian curve fitting method. The experiments results on a plastic cylinder and a black ant at the Beijing Synchrotron Radiation Facility prove that the polynomial curve fitting method can obtain most approximate refraction-angle values and its computation speed is 10 times faster than the Gaussian curve fitting method.

关键词： diffraction enhanced imaging synchrotron radiation polynomial curve fitting

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Predicting of Land Surface Temperature Distribution in Freetown City, Sierra Leone by Using polynomial curve fitting Model

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Journal of Geographic Information System 2020年第5期12卷 531-544页

作者： Elhadi K. Mustafa Guoxiang Liu Abubakr Hassan Mohamed A. Damos Musa Tarawally Department of Surveying and Geo-Informatics Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University Chengdu China School of Resources and Environment University of Electronic Science and Technology of China Chengdu China

Global warming has attracted much concern about the worldwide organization, civil society groups, researchers, and so forth because the worldwide surface temperature has been expanding. This investigation intends to assess and compare the ability of a combination of land cover indices to predict the future distribution of land surface temperatures in Freetown using the polynomial model analysis. Landsat satellite images of 1988, 1998, 2000, 2010, and 2018 of the Freetown Metropolitan zone were utilized for analysis. The investigation had adopted two land covers indices, Modification of normalized difference water index and Urban Index (UI) (e.g., MNDWI and UI) and applied a multi regression equation for forecasting the future LST. The stimulation results propose that the development will be accompanied by surface temperature increases, especially in Freetown’s western urban area. The temperature prevailing in the west of the metropolitan area may increase in the city somewhere in the range from 1988 to 2018. Additionally, the results of the LST prediction show that the model is perfect. Our discoveries can be represented as a helpful device for policymakers and community awareness by giving a scientific basis for sustainable urban planning and management.

关键词： Global Warming Land Surface Temperature polynomial curve fitting Land Cover Indices

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Biomimetic Experimental Research on Hexapod Robot's Locomotion Planning

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Journal of Beijing Institute of Technology 2009年第1期18卷 27-31页

作者：黄麟韩宝玲罗庆生张春林徐嘉 School of Mechanical and Vehicular Engineering Beijing Institute of Technology School of Aerospace Science and Engineering Beijing Institute of Technology

To provide hexapod robots with strategies of locomotion planning, observation experiments were operated on a kind of ant with the use of high speed digital photography and computer assistant analysis. Through digitalization of original analog video, locomotion characters of ants were obtained, the biomimetic foundation was laid for polynomial trajectory planning of multi-legged robots, which was deduced with mathematics method. In addition, five rules were concluded, which apply to hexapod robots marching locomotion planning. The first one is the fundamental strategy of multi-legged robots＇ leg trajectory planning. The second one helps to enhance the static and dynamic stability of multi-legged robots. The third one can improve the validity and feasibility of legs＇ falling points. The last two give criterions of multi-legged robots＇ toe trajectory figures and practical recommendatory constraints. These five rules give a good method for marching locomotion planning of multi-legged robots, and can be expended to turning planning and any other special locomotion.

关键词： biomimetic experimental research hexapod robot locomotion planning trajectory planning polynomial curve fitting

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