摘要：针对合成孔径雷达(SAR)干扰系统缺乏对手和环境的问题,提出一种小型无人机载SAR系统用于SAR干扰系统试验的思路。分析了小型无人机载SAR在试验运用中面临的问题。设计了一种可用于SAR干扰系统试验的无人机载SAR半实物仿真系统。研究成果可为SAR干扰系统试验及无人机载SAR半实物仿真系统建设提供理论借鉴和技术支撑。

摘要：The multi-model ensemble （MME） of 20 models from the Coupled Model Intercomparison Project Phase Five （CMIP5） was used to analyze surface climate change in the 21st century under the representative con- centration pathway RCP2.6, to reflect emission mitigation efforts. The maximum increase of surface air temperature （SAT） is 1.86℃ relative to the pre-industrial level, achieving the target to limit the global warming to 2℃. Associated with the ＂increase-peak-decline＂ greenhouse gases （GHGs） concentration path- way of RCP2.6, the global mean SAT of MME shows opposite trends during two time periods： warming during 2006-55 and cooling during 2056-2100. Our results indicate that spatial distribution of the linear trend of SAT during the warming period exhibited asymmetrical features compared to that during the cool- ing period. The warming during 2006-55 is distributed globally, while the cooling during 2056-2100 mainly occurred in the NH, the South Indian Ocean, and the tropical South Atlantic Ocean. Different dominant roles of heat flux in the two time periods partly explain the asymmetry. During the warming period, the latent heat flux and shortwave radiation both play major roles in heating the surface air. During the cooling period, the increase of net longwave radiation partly explains the cooling in the tropics and subtropics, which is associated with the decrease of total cloud amount. The decrease of the shortwave radiation accounts for the prominent cooling in the high latitudes of the NH. The surface sensible heat flux, latent heat flux, and shortwave radiation collectively contribute to the especial warming phenomenon in the high-latitude of the SH during the cooling period.

摘要：朗诵艺术作为语言艺术的分支,有着独特的艺术特点以及良好的育人价值,其作用在于舒缓学生的身心,引导学生养成正确的价值观,促进学生之间的交往。因而,要过组织朗诵社团、纳入心理健康教育、开展主题朗诵活动等,有效发挥朗诵艺术的作用。

摘要：设计了一种具有双陷波特性的超宽带单极子天线,在天线中加入两个"U"形缝隙结构,分别在3.3GHz^3.6GHz和5.15GHz^5.825GHz两个频段处产生陷波,并用传输线等效模型对陷波产生的原因进行了分析。在陷波缝隙处加入三个开关结构,对陷波频段进行控制。分析了开关状态的变化对等效电路的影响,对不同开关状态的超宽带天线进行制作并测试。结果表明,天线可以在无陷波、3.5GHz单一陷波、5.5GHz单一陷波和双陷波四种工作状态之间进行转换。

摘要：基于C#语言,开发设计了数字存储示波器的控制软件,通过调用VISA函数和发送SCPI指令,实现了远程控制示波器采集数据、设置参数、显示波形等功能。利用双缓冲技术解决了波形显示时产生闪烁的现象,利用GDI+动态绘图技术和"图层"技术实现波形的光标测量功能。控制软件易于更新和扩展,在电子测量系统中具有很好的应用前景。