上层大气中铁质流星尾迹的紫外光谱模拟

基于 Sparrow理论 ,计算了海拔 90— 95 km高空的不同初始地心坐标速度的典型铁质流星的有效温度 ,获得初速 72 km/ s的该类流星尾迹主要成分的粒子数密度 ,以 Cloudy程序模拟了该流星尾迹的 2 0 0—4 0 0 nm波段紫外辐射 ,给出了若干预期的强谱线的相对强度     

Fe靶激光等离子体25～60nm波段光谱实验研究

以McPHERSON247型掠入射软X射线 真空紫外单色仪配合5900Magnum通道电子倍增器,测量了Fe靶在高真空环境下的纳秒激光等离子体25～60nm波段的EUV光谱,单色仪理论光谱分辨率Δλ≤0.038nm,波长扫描间隔0.1nm。在上述波段内测得了FeVI及FeV的强发射线丛,认证出14根强谱线。     

Nitrogen and Boron Co-Doped Carbon Nanotubes Embedded with Nickel Nanoparticles as Highly Efficient Electromagnetic Wave Absorbing Materials

Due to the limitations of impedance matching and attenuation matching,carbon nanotubes(CNTs)employed alone have a weak capacity to attenuate electromagnetic wave(EMW)energy.In this work,B and N co-doped CNTs with embedded Ni nanoparticles(Ni@BNCNTs)are fabricated via an in situ doping method.Compared with a sample without B doping,Ni@BNCNTs demonstrate a superior EMW absorption performance,with all minimum reflection loss values below?20 dB,even at a matching thickness of 1.5 mm.The experimental and theoretical calculation results demonstrate that B doping increases conduction and polarization relaxation losses,as well as the impedance matching characteristic,which is responsible for the enhanced EMW absorption performance of Ni@BNCNTs.     

15-75nm波段室温干燥空气的光谱分辨XUV透过率测量

以McPHERSON247型掠入射软射线-真空紫外单色仪配合5900Magnum通道电子倍增器,在室温下测量了不同压强下干燥空气的15—75nm波段光谱分辨极紫外辐射(XUV)透过率,单色仪理论光谱分辨率Δλ≤0.075nm,波长扫描间隔0.5nm,有效吸收长度100mm。测量结果与Henke等人的数据进行了对比。