Insecticidal activities and active ingredients of Stephania kwangsiensis Lo. were studied for the first time. The results showed that all parts of S. kwangsiensis Lo. had contact activity against brown planthoppers, N...Insecticidal activities and active ingredients of Stephania kwangsiensis Lo. were studied for the first time. The results showed that all parts of S. kwangsiensis Lo. had contact activity against brown planthoppers, Nilaparvata lugens Stal, and the contact activity of methanol extract from root tubers was the highest, with a LD50 value being 1.5794 lag/female. l-roemerine was isolated from root tubers of S. kwangsiensis Lo. and identified, and it was the main active ingredient. l-roemerine had high contact toxicity to brown planthoppers, with a LD50 value being 0.0443 lag/female. Contact toxicity of l-roemerine to brown planthoppers was 7.48 times that of malathion, the convientional chemical insecticide used for controlling brown planthoppers.l-roemerine also had stomach poison activity against brown planthoppers.展开更多
针对目前基于信道脉冲响应(Channel Impulse Response,CIR)的非视距(None Line of Sight,NLoS)/视距(Line of Sight,LoS)识别方法精度低、泛化能力差的问题,提出了一种多层卷积神经网络(Convolutional Neural Network,CNN)与通道注意力...针对目前基于信道脉冲响应(Channel Impulse Response,CIR)的非视距(None Line of Sight,NLoS)/视距(Line of Sight,LoS)识别方法精度低、泛化能力差的问题,提出了一种多层卷积神经网络(Convolutional Neural Network,CNN)与通道注意力模块(Channel Attention Module,CAM)相结合的NLoS/LoS识别方法。在多层CNN中嵌入CAM提取原始CIR的时域数据特征,利用全局平均池化层代替全连接层进行特征整合并分类输出。使用欧洲地平线2020计划项目eWINE公开的数据集进行不同结构模型和不同识别方法的对比实验,结果表明,所提出的CNN-CAM模型LoS和NLoS召回率分别达到了92.29%与87.71%,准确率达到了90.00%,F1分数达到了90.22%。与现有多种传统识别方法相比,均具有更好的识别效果。展开更多
基金the Natural Science Foundation of Guangdong Province(03683).
文摘Insecticidal activities and active ingredients of Stephania kwangsiensis Lo. were studied for the first time. The results showed that all parts of S. kwangsiensis Lo. had contact activity against brown planthoppers, Nilaparvata lugens Stal, and the contact activity of methanol extract from root tubers was the highest, with a LD50 value being 1.5794 lag/female. l-roemerine was isolated from root tubers of S. kwangsiensis Lo. and identified, and it was the main active ingredient. l-roemerine had high contact toxicity to brown planthoppers, with a LD50 value being 0.0443 lag/female. Contact toxicity of l-roemerine to brown planthoppers was 7.48 times that of malathion, the convientional chemical insecticide used for controlling brown planthoppers.l-roemerine also had stomach poison activity against brown planthoppers.
文摘针对目前基于信道脉冲响应(Channel Impulse Response,CIR)的非视距(None Line of Sight,NLoS)/视距(Line of Sight,LoS)识别方法精度低、泛化能力差的问题,提出了一种多层卷积神经网络(Convolutional Neural Network,CNN)与通道注意力模块(Channel Attention Module,CAM)相结合的NLoS/LoS识别方法。在多层CNN中嵌入CAM提取原始CIR的时域数据特征,利用全局平均池化层代替全连接层进行特征整合并分类输出。使用欧洲地平线2020计划项目eWINE公开的数据集进行不同结构模型和不同识别方法的对比实验,结果表明,所提出的CNN-CAM模型LoS和NLoS召回率分别达到了92.29%与87.71%,准确率达到了90.00%,F1分数达到了90.22%。与现有多种传统识别方法相比,均具有更好的识别效果。
