天空混浊时卷层云的观测     

张遂菊  余辉 《河南气象》2004,(1):47-47

《地面气象观测规范》对云与云之间及沙尘一类天气现象之间相似点的比较都有详细说明，观测判别这类现象时有据可依，而对沙尘下云的判断则无详细说明，当遇到沙尘天气，水平能见度、垂直能见度均较差的情况下，云特别是卷层云的判别就比较困难。  相似文献   

新疆水文水资源变化及对区域气候变化的响应   总被引：6，自引：1，他引：5  

徐长春  陈亚宁  杨余辉  郝兴明  沈永平 《地理学报(英文版)》2010,20(4):599-612

Based on the surface runoff, temperature and precipitation data over the last 50 years from eight representative rivers in Xinjiang, using Mann-Kendall trend and jump detection method, the paper investigated the long-term trend and jump point of time series, the surface runoff, mean annual temperature and annual precipitation. Meanwhile, the paper analyzed the relationship between runoff and temperature and precipitation, and the flood frequency and peak flow. Results showed that climate of all parts of Xinjiang conformably has experienced an increase in temperature and precipitation since the mid-1980s. Northern Xinjiang was the area that changed most significantly followed by southern and eastern Xinjiang. Affected by temperature and precipitation variation, river runoff had changed both inter-annually and intra-annually. The surface runoff of most rivers has increased significantly since the early 1990s, and some of them have even witnessed the earlier spring floods, later summer floods and increasing flood peaks. The variation characteristics were closely related with the replenishment types of rivers. Flood frequency and peak flow increased all over Xinjiang. Climate warming has had an effect on the regional hydrological cycle.  相似文献   

数值预报产品在单站寒潮预报中的应用     

陈海莲王新芳  王剑环祝忠毅  李忠民余辉 《气象与环境科学》2005,(3):19-19

介绍了利用数值预报产品进行单站寒潮预报的方法.  相似文献   

三维重建在孤立性肺结节血管集束征的诊断价值          下载免费PDF全文

陈子敏  向子云  王毅  詹勇  余辉 《CT理论与应用研究》2017,26(1):69-76

目的:探讨三维重建图像对孤立性肺结节（SPN）血管集束征的显示及其诊断价值。资料与方法:回顾性分析经病理确诊的63例SPN,在三维重建工作站进行多平面重组（MPR）及容积再现（VR）,观察血管集束征的显示,统计分析两种方法的差异以及在良恶性SPN鉴别诊断中的应用价值。结果:SPN的血管集束征在VR图像显示率高于MPR（P<0.05）,在MPR和VR图像上,恶性SPN血管集束征的显示率均高于良性（P<0.05）。结论:三维重建图像能够更全面地显示血管集束征,对SPN的良恶性分析有一定的参考价值。   相似文献   

1994年夏季我国炎热与日食有关     

余辉 《陕西气象》1995,(2)

１９９４年夏季我国炎热与日食有关１９９４年夏季我国大部分地区炎热且热得时间长，是西太平洋副热带高压北上西伸特强且长时间稳定少动所致；而副高的位置与日食有关。５月１０日在７８”Ｗ、３５”Ｎ出现日食中心，而这次日食覆盖了整个西半球的中纬度，跨西经１４２个...  相似文献