Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract： Air pollutants have strong homology with greenhouse gases and are closely related to fossil fuel combustion. The high-intensity energy use in the eastern region of China has turned this region into a hot area of carbon dioxide emission and heavy air pollution in the past. Since the implementation of the Action Plan for the Prevention and Control of Air Pollution, the adjustment of industrial structure and the improvement of terminal treatment technology have been driving the succession of key species of air pollution and the spatio-temporal distribution of greenhouse gases in China. This paper analyzes the trend in major air pollutants and greenhouse gas concentration in different regions of China from 2013 to 2020, and reveals the migration of air pollution and carbon emissions from the east to the northwest China. Based on statistical data, the causes of the changes in the spatio-temporal distribution of air pollutants and greenhouse gases in China are clarified, and corresponding solutions are proposed. The results can provide scientific and technological support for realizing the goal of pollution and carbon reduction synergy.
Subjects: Astronomy >> Astrophysical processes submitted time 2019-09-18 Cooperative journals: 《天文研究与技术》
Abstract： 全天相机云图在天文观测领域具有重要价值，但云图所含噪声会造成不良影响。本文先后分析了星光噪声、月光噪声、日光噪声、雷电噪声、反光噪声和特殊噪声等，并总结出不同类型噪声的分布、区域大小等方面的特点，最后结合与云层的相对位置关系提出了边界阈值法、时间轴法、反比例线性变换等8种图像处理去噪算法，并形成一个完整的去噪系统。通过实验对不同的算法加以比较，得出不同噪声情况下的最佳去噪方案。实验结果表明，该系统可以有效去除常见噪声，基本保持云层和天空的信息完整性，可简单便捷实现云图去噪。
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