溶胶-凝胶法制备不同锌硅比硅酸锌陶瓷

本文采用溶胶-凝胶法制备不同锌硅比的Zn2SiO4陶瓷。红外光谱分析发现其溶胶-凝胶化过程主要依赖于原料中正硅酸乙酯的水解和聚合。研究发现,随着锌硅比从1.6增加到2.0时,粉体的烧结温度在增加。XRD结果表明当锌硅比小于1.9时,陶瓷主晶相是Zn2SiO4,同时存在有少量的SiO2相,大于和等于1.9时出现了ZnO相。微波介电性能的研究结果表明,随着锌硅比的增加,介电常数略有增加;品质因子先增加后减小。当锌硅比等于1.8时,陶瓷的品质因子达到123000,其介电常数为6.5。     

ICP-OES测定电路板制造废水中的铜、镍和锡

建立了电感耦合等离子体-发射光谱法测定电路板制造废水中铜、镍和锡的方法,研究了消解方法及分析谱线的选择。该方法与国标原子吸收光谱法比较结果无显著性差异。方法应用于不同浓度电路板制造废水的测定,铜、镍和锡的方法检出限分别为0.006、0.005、0.008mg/L,加标回收率分别为91.6%—102.6%、93.0%—105.0%、92.6%—101.8%,相对标准偏差分别为0.7%—2.6%、1.5%—4.5%、1.1%—3.2%。     

Optimal design of sub-wavelength metal rectangular gratings for polarizing beam splitter based on effective medium theory

A novel optimal design of sub-wavelength metal rectangular gratings for the polarizing beam splitter (PBS) is proposed. The method is based on effective medium theory and the method of designing single layer antireflection coating. The polarization performance of PBS is discussed by rigorous couple-wave analysis (RCWA) method at a wavelength of 1550~nm. The result shows that sub-wavelength metal rectangular grating is characterized by a high reflectivity, like metal films for TE polarization, and high transmissivity, like dielectric films for TM polarization. The optimal design accords well with the results simulated by RCWA method.     

快速溶剂萃取红外分光法测定土壤中石油类

研究了快速溶剂萃取红外分光法对土壤中石油类的提取效果,并与超声波萃取红外分光法比较.结果表明,快速溶剂萃取对土壤中的石油类的回收率高,精密度好,方法快速简便.