EGDP/腈混纺针织绒工艺探讨

介绍了ECDP纤维的主要性能,ECDP/腈混纺针织绒的纺纱工艺,对生产过程中出现的困难,提出了解决办法.     

MOCVD生长的GaN 薄膜中缺陷团引起的X射线漫散射研究

采用高分辨X射线衍射对在蓝宝石(0001)面生长的GaN外延膜的漫散射进行了研究.结果表明,GaN薄膜中存在缺陷团,其浓度随着穿透位错密度的增加而增加,其平均半径呈相反趋势.基于位错是点缺陷的聚集区,缺陷团优先在位错附近形成的效应对结果进行了解释.同时发现电子迁移率随缺陷团浓度的增加而减少.     

MOCVD生长的GaN薄膜中缺陷团引起的X射线漫散射研究

采用高分辨X射线衍射对在蓝宝石(0001)面生长的GaN外延膜的漫散射进行了研究.结果表明,GaN薄膜中存在缺陷团,其浓度随着穿透位错密度的增加而增加,其平均半径呈相反趋势.基于位错是点缺陷的聚集区,缺陷团优先在位错附近形成的效应对结果进行了解释.同时发现电子迁移率随缺陷团浓度的增加而减少.     

Preparation and Luminescent Characteristics of LaPO_4∶Eu Nanoparticles and Nanowires

Itiswellknownthatreductionofparticlesizeofcrystallinesystemcanresultinremarkablemodifica tionoftheirpropertieswhicharedifferentfromthoseofbulkbecauseofhighsurfacetovolumeratioandquan tumconfinementeffectofnanometermaterials .In1994 ,Bhargavaetal .reportedthatradiativetransi tionrateofMn2 ionsinZnSnanocrystalincreasedsixorderincomparisonwithbulkone[1] .Despitethisre sultwasstronglycriticizedlater ,studiesonnanosizedluminescentsemiconductorattractedgreatinter ests[2～ 4 ] .Sincecompoundsofra…     

Preparation and Luminescent Characteristics of LaPO4：Eu Nanoparticles and Nanowires

Nanoparticles and nanowires of LAPO4: Eu phosphors were synthesized by hydrothermal method. Their luminescent properties including electronic transition, surface effect, and temperature-dependent luminescent characteristics were systemically studied and compared to the bulk powders. It can be concluded that in comparison with the bulk powders, the fluorescence intensity decreases in nanoparticles and nanowires, while the lifetime increases, indicating that the radiative transition rate decreases. The nonradiative transition rate in nanowires decreases than that in nanoparticles due to its decreased surface to volume ratio. The temperature-dependent experiments indicate that the thermal quenching in nanopowders becomes weaker than that in the bulk powders.     

Preparation and Luminescent Characteristics of LaPO4∶Eu Nanoparticles and Nanowires

Nanoparticles and nanowires of LaPO4: Eu phosphors were synthesized by hydrothermal method. Their luminescent properties including electronic transition, surface effect, and temperature-dependent luminescent characteristics were systemically studied and compared to the bulk powders. It can be concluded that in comparison with the bulk powders, the fluorescence intensity decreases in nanoparticles and nanowires, while the lifetime increases, indicating that the radiative transition rate decreases. The nonradiative transition rate in nanowires decreases than that in nanoparticles due to its decreased surface to volume ratio. The temperature-dependent experiments indicate that the thermal quenching in nanopowders becomes weaker than that in the bulk powders.     

电脑仿真技术的应用与研究

对目前国内外出现的几种典型的用于电路原理图设计的软件作了归纳总结和分析比较．在此基础上叙述了《Protel Schematic 99SE》仿真软件的应用、性能及在电气设备教学实验中的使用情况等作了简要的介绍。     

ECDP／腈混纺针织绒工艺探讨

介绍了ECDP纤维的主要性能，ECDP／腈混纺针织绒的纺纱工艺，对生产过程中出现的困难，提出了解决办法。