Symptoms of leaf necrosis or chlorosis of bamboo induced by Typhoon 0613 （T0613） were analyzed using RGB image analysis in Yamaguchi city, Japan. Results showed a closely positive relationship between Green/Red （G/...Symptoms of leaf necrosis or chlorosis of bamboo induced by Typhoon 0613 （T0613） were analyzed using RGB image analysis in Yamaguchi city, Japan. Results showed a closely positive relationship between Green/Red （G/R） value for indoor taking images of bam- boo individual leaves and chlorophyll meter value （SPAD） with regression coefficient of 0.961. The relation between G/R value of room taking images and Necrotic Area Percentage （NAP） for bamboo individual leaves showed an inverse logistic function relationship, with the correlated coefficient equaling to 0.958. Both leaf chlorosis and necrosis can be quantitatively estimated by RGB image analysis. Moreover, the variance of Green/Luminance （G/L） value for the same leaf was less than that of G/R for images taken in the conditions with large light difference, especially for green leaves. G/L value also exhibited a closer relationship with SPAD value of leaves with chlorosis than that of G/R values at the same condition. The relationship between G/L value for bamboo canopies and the Distance from Coastline （DC） was also closer than that of the G/R value for the images taken at field sites with big light difference.展开更多
主要介绍中国联通济南分公司在高铁场景应用大功率基站进行5G网络覆盖的方案。采用了业界最领先的400 W 8T8R射频拉远模块,并结合华为公司自主研发的12小区合并方案。针对性地解决了5G网络在高铁场景所面临多普勒频偏增大、站间距缩小...主要介绍中国联通济南分公司在高铁场景应用大功率基站进行5G网络覆盖的方案。采用了业界最领先的400 W 8T8R射频拉远模块,并结合华为公司自主研发的12小区合并方案。针对性地解决了5G网络在高铁场景所面临多普勒频偏增大、站间距缩小引起切换更频繁、用户密集带来的容量需求突增等方面的挑战,提高了5G网络在高铁场景的覆盖效果和语音质量,为中国联通高铁5G建设提供了新的参考依据。展开更多
文摘Symptoms of leaf necrosis or chlorosis of bamboo induced by Typhoon 0613 （T0613） were analyzed using RGB image analysis in Yamaguchi city, Japan. Results showed a closely positive relationship between Green/Red （G/R） value for indoor taking images of bam- boo individual leaves and chlorophyll meter value （SPAD） with regression coefficient of 0.961. The relation between G/R value of room taking images and Necrotic Area Percentage （NAP） for bamboo individual leaves showed an inverse logistic function relationship, with the correlated coefficient equaling to 0.958. Both leaf chlorosis and necrosis can be quantitatively estimated by RGB image analysis. Moreover, the variance of Green/Luminance （G/L） value for the same leaf was less than that of G/R for images taken in the conditions with large light difference, especially for green leaves. G/L value also exhibited a closer relationship with SPAD value of leaves with chlorosis than that of G/R values at the same condition. The relationship between G/L value for bamboo canopies and the Distance from Coastline （DC） was also closer than that of the G/R value for the images taken at field sites with big light difference.
文摘主要介绍中国联通济南分公司在高铁场景应用大功率基站进行5G网络覆盖的方案。采用了业界最领先的400 W 8T8R射频拉远模块,并结合华为公司自主研发的12小区合并方案。针对性地解决了5G网络在高铁场景所面临多普勒频偏增大、站间距缩小引起切换更频繁、用户密集带来的容量需求突增等方面的挑战,提高了5G网络在高铁场景的覆盖效果和语音质量,为中国联通高铁5G建设提供了新的参考依据。
文摘采用自主研发的多源多宿GNSS-R(Global Navigation Satellite System-Reflections,全球导航卫星系统反射信号)海洋环境遥感探测系统,在天津渤海湾特定区域进行了3次机载校飞试验,获得了大量有效GNSS-R信号数据,对自然条件下的海面有效波高进行了反演处理。该系统通过对接收的GNSS直达信号和海面反射信号进行相关运算处理,可以获得DDM(Delay-Doppler Mapping,时延—多普勒映射)图谱,再利用DCF(Derivative of the Correlation Function,相关函数的导数)在DDM图谱基础上进行相关功率波形的计算,进而通过计算DCF的函数波形宽度得到海面有效波高,验证了该方法的可行性。该方法具有全天时、全天候、高分辨率、低成本等优点,对全球范围内中小尺度海洋状态和物理现象的监测具有重要意义。
