锑掺杂氧化锡粉体的太赫兹透射特性

以SnCl45H2O和SbCl3为原料,采用液相化学共沉淀法制备锑掺杂氧化锡（ATO）粉体。分析了不同Sb掺杂质量分数条件下,ATO粉体的禁带宽度变化,并对材料在0.2~1.6 THz波段的透射时域和频域谱,以及吸收和屏蔽参数进行了对比分析。结果表明,ATO粉体的禁带宽度随着Sb掺杂量的增加先减小后增大;同时,ATO粉体对THz波的吸收系数随着Sb掺杂量的增加先增大后减小,当Sb掺杂质量分数为9%时,ATO的吸收系数在1.25 THz处达到最大值156.5 cm-1,屏蔽效能在1.24~1.60 THz范围内最高达到45.0 dB。     

若干函数不等式探析

针对近几年大学生高等数学竞赛和硕士研究生入学考试中出现的若干有关函数不等式的试题,探讨分析其命题背景,并推广深化相关结果.     

Morphology,Size-controlled Synthesis of CoO Nanostructure and Its Magnetic Property

CoO nanostructures with tunable morphology and size have been prepared via a simple one-pot solvothermal synthesis. The as-prepared nanoparticles were fully characterized using X-ray diffraction（XRD）, transmission electron microscopy（TEM）, field-emission scanning electron microscope（FESEM）, etc. The morphology and size of the product can be easily controlled by adjusting the raw materials added. Reaction time and the solvent ratio also play important roles in the synthesis of octahedral nanostructures. The magnetic property of the as-prepared samples was also investigated.