针对TEM喇叭天线终端反射大、低频辐射效率低的问题，对其进行了仿真优化设计。采用时域分析方法，分析了端部加载电阻与背部加载电阻的低频补偿方法，对TEM喇叭天线的尺寸、极板顶角等结构参数进行了优化，采用末端卷边结构，提升了辐射场的峰值场强与脉宽。根据仿真优化结果，研制了长度2.5 m、天线极板间张角45°、天线极板顶角45°的TEM喇叭天线，通过实测验证了仿真结果。结果表明，加载电阻可以有效降低反射，背部加载电阻方式的峰值场强和脉宽比端部加载电阻高，且采用4个电阻并联加载的效果较好；适当增加天线长度、极板顶角以及极板间夹角可以提高天线辐射性能。该研究结果为TEM喇叭天线在辐射式核电磁脉冲试验系统的应用提供了参考。

目前的电场探头标定实验大多只考虑TEM小室结构和性能的影响，在校准实验中，探头的放入使得标定结果产生了很大的偏差，相较于TEM小室，电场探头的尺寸是产生误差的主要原因。以开放式TEM小室为基础，考虑了实际模型和电场探头的影响，利用三维电磁仿真软件，从时域角度研究了不同结构和尺寸TEM小室的辐射场分布，并从频域角度对TEM小室的S参数进行分析。比较了探头放入小室前后的误差，并根据计算结果引入了电场的校准公式。为改善探头对电场的影响，设计了一种新型结构，结果表明，新结构在保证带宽的同时，提高了电场的均匀性和探头标定的准确度。

高熵会带来热力学上的高熵效应、结构上的晶格畸变效应、动力学上的迟滞扩散效应以及性能上的“鸡尾酒”效应, 通过高熵设计来提高陶瓷材料的性能是目前研究的热点, 而通过透射电镜揭示高熵结构及其与性能相关性的研究还很缺乏。本研究以相应金属氧化物、碳化硼和石墨为原材料, 在制备高熵硼化物和高熵碳化物粉体的基础上, 利用放电等离子体烧结制备得到高熵(TiZrHfNbTa)B₂和(TiZrHfNbTa)C陶瓷。采用透射电子显微镜及其能谱分析手段对两种高熵陶瓷进行了纳米尺度和原子尺度的结构表征, 发现过渡金属元素固溶后保持了晶体结构的完整性, 五种元素分布均匀, 但在原子尺度存在固溶元素的浓度振荡、原子离散和晶格应变。本工作获得的原子尺度的固溶结构信息将有助于对高熵陶瓷构效关系的理解, 并为高熵陶瓷的组分和结构设计提供实验依据。

基于功率容量和口径匹配扩展低频工作带宽两方面的考虑，设计了一种具有分布式阻抗末端加载结构的超宽带TEM喇叭天线。首先，对渐变式同轴-平板的巴伦结构进行了优化设计，扩展了馈电结构的工作带宽，提高了馈电效率；其次，对指数型TEM喇叭天线末端进行了分布式阻抗的匹配设计，其端口特性和辐射特性均得到了明显改善，并采用功率方向图和能量方向图对天线的辐射效果进行评估。实验结果表明，相对于指数型TEM喇叭天线，加载分布式阻抗匹配末端结构后，天线低频带宽展宽了330 MHz，天线主轴辐射电场峰峰值提高了10%，馈电效率提高了17%。

Te(Ⅳ), Se(Ⅳ), V(Ⅲ), Nb(Ⅴ) and Ta(Ⅴ) complexes of indole-3-acetic acid (IAAH) ligand were synthesized, characterized by elemental analysis and various spectroscopic techniques like, IR, ¹H-NMR, X-ray powder diffraction, UV-Visible, thermogravimetry analysis, magnetic measurements, molar conductance and surface morphology using SEM. All the synthesized complexes of IAAH ligand have 1∶2 stoichiometry of the types [Te(IAA)₂(NH₃)₂]·2Cl (Ⅰ), [Se(IAA)₂(NH₃)₂]·2Cl (Ⅱ), [V(IAA)₂(NH₃)(Cl)] (Ⅲ), [Nb(IAA)₂(Cl)₃] (Ⅳ), and [Ta(IAA)₂(Cl)₃] (Ⅴ). Spectral analysis indicates octahedral geometry for the Te(Ⅳ), Se(Ⅳ) and V(Ⅲ) complexes, whereas both Nb(Ⅴ) and Ta(Ⅴ) have a seven-coordination. The bonding sites are the oxygen atoms of carboxylate group for the deprotonated indole-3-acetic acid (IAA) ligand. The thermogravimetry analysis studies gave evidence for the presence of other coordinated molecules (Cl or NH₃) in the composition of IAA complexes, which were further supported by IR and micro analytical measurements. The higher molar conductance data of tellurium and selenium (Ⅳ) complexes reveal that these chelates are electrolytes, while low conductivity values for the vanadium(Ⅲ), niobium and tantalum(Ⅴ) chelates indicated a non-electrolytes. To test the antibacterial property of the five complexes in this study, four bacterial strains Klebsiella (G^-), Escherichia coli (G^-), Staphylococcus aureus (G⁺) and Staphylococcus epidermidis (G⁺) were used in the investigation. The effects of the five complexes in the cytotoxicity of Caco-2 and Mcf-7 human cancer cell lines were studied Neutral red uptake assay for the estimation of cell viability/cytotoxicity protocol.

The instability of lead halide perovskites in various application-related conditions is a key challenge to be resolved. We investigated the formation of metal nanoparticles during transmission electron microscopy (TEM) imaging of perovskite-related metal halide compounds. The metal nanoparticle formation on these materials originates from stimulated desorption of halogen under electron beams and subsequent aggregation of metal atoms. Based on shared mechanisms, the TEM-based degradation test can help to evaluate the material stability against light irradiation.

In this article, spherical black spots-like selenium metal nanoparticles were synthesized. Accordingly, this experimental work proposed an innovative facile, green, one-step and solvent-free strategy to a large scale synthesis of Se-NPs via thermal decomposition of green precursor. The Se(Ⅳ) L-glutamine precursor was prepared by solid state grinding using selenium(Ⅳ) tetrachloride, SeCl₄, and L-glutamine for 2 hr without using any organic solvent. It was characterized by infrared spectroscopy, and micro analytical. The solid precursor compound was subsequently annealed in the muffle furnace at 300 ℃ for 3 hr in static air. Selenium NPs was resulted and well characterized using X-ray powder diffraction (XRD), FT-IR spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The FTIR and XRD data showed that the Se NPs is pure and has a good crystalline structure because no characteristic peaks of impurity were detected, while the SEM and TEM results showed that the obtained product is tiny, aggregated with spherical-like shape, narrow size distribution with an average size between 5~10 nm. Results show that the solid state thermal decomposition method is simple, eco-friendly, safe and suitable for preparation of SeNPs. This method can also be applied to synthesize nanoparticles pure metal and metal oxides.