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91.
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The spin-dependent transport properties in the non-collinear pattern of series of δ-magnetic barriers are studied by using scattering theory and Green‘s function methods. The Green‘s function is obtained by using distorted wave approach and the scattering matrix is related by Fisher-Lee relationship. In addition to reproducing the results of Papp‘s and Xu‘s in parallel and antiparallel configurations, we also obtain further results, where arbitrary orientations of the magnetic barriers and arbitrary number of barriers are included. The main finding of our results is that the signs of polarizations can be switched around some “geometric unpolarized windows“. The well-known antiparallel configuration has no such characteristics. Furthermore, we discuss spin-related partial densities of states in both polarized and unpolarized structures. 相似文献
93.
Asymmetric mode transformation in waveguide is of great significance for on-chip integrated devices with one-way effect, while it is challenging to achieve asymmetric nonlinear-mode-conversion (NMC) due to the limitations imposed by phase-matching. In this work, we theoretically proposed a new scheme for realizing asymmetric NMC by combining frequency-doubling process and periodic PT symmetric modulation in an optical waveguide. By engineering the one-way momentum from PT symmetric modulation, we have demonstrated the unidirectional conversion from pump to second harmonic with desired guided modes. Our findings offer new opportunities for manipulating nonlinear optical fields with PT symmetry, which could further boost more exploration on on-chip nonlinear devices assisted by non-Hermitian optics. 相似文献
94.
(Y,Gd)BO3:Tb3+的真空紫外及紫外激发光谱特性 总被引:2,自引:0,他引:2
采用传统的高温固相反应法合成出(Y,Gd)BO3:Tb荧光体,对所制得的荧光体进行了晶体结构分析,分析结果表明结晶良好。(Y,Gd)BO3:Tb在147nm真空紫外光激发下的发射主峰在544nm(Tb^3+的^5D4→^7F5跃迁),是一种绿色发光材料。样品的真空紫外激发光谱及紫外激发光谱表明,(Y,Gd)BO3:Tb的基质吸收带位于150nm附近。Gd^3+离子对真空紫外区的光吸收有增强作用,存在着Gd^3+→Tb^3+的能量传递。测量了荧光粉在室温下的荧光衰减特性,其余辉时间约为8ms,能够满足显示显像技术的要求。因此,(Y,Gd)-BO3:Tb是一种有前景的PDP用绿色发光材料。 相似文献
95.
尚雷蔡啸 王曼王志刚 方建刘春秀 刘万金孙丽君李光毅 严亮张宏杰 张振华单利民周莉 俞伯祥袁诚赵正印 秦纲夏小米 赖元芬董明义 谢文杰胡涛 吕军光 《中国物理 C》2007,31(2):177-182
利用宇宙射线进行探测器模型的性能测试是高能物理普遍采用的方法,其中最重要的步骤之一就是确定宇宙线入射的准确位置和径迹.多数采用丝室探测器来进行宇宙线的精确定位,需要很高的造价和复杂的电子学系统.本文介绍一种简单的定位方法,采用塑料闪烁体条加波移剂光纤编码读出的方式,可以实现精度为1cm的定位.据此建立了一套实验装置,对BESⅢ电磁量能器CsⅠ(Tl)晶体探测器单元的光输出强度和不均匀性进行了测量. 相似文献
96.
采用溶胶凝胶法制备了Y_4Zr_3O_(12)∶Eu~(3+)纳米荧光粉,分别采用XRD、TEM和荧光光谱仪对样品的结构、形貌和发光性能进行了表征,探讨了烧结温度和Eu~(3+)掺杂浓度对荧光粉发光性能的影响。结果表明,样品可以被394 nm和467 nm的激发光有效激发。样品的最佳烧结温度和Eu~(3+)离子的最佳掺杂摩尔分数分别为1 400℃和18%。浓度猝灭主要归因于电偶极-电偶极相互作用。 相似文献
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By adding magnetic powders into matrix material, it has been proved to be a creative approach to improve tribological properties of brake materials. In this paper, a novel magnetic brake material with Nd–Fe–B and nano-Fe3O4 was developed, and the influential mechanism of these two magnetic powders and their content on the friction and wear performance was deeply discussed. Firstly, some experiments were carried out to investigate the tribological performance and influential mechanisms of four groups of brake pad samples with different magnetic powders. Furthermore, based on these results, further experiments for investigating the influence that Nd–Fe–B contents have on the tribological properties were conducted. According to the theoretical analysis about experiments, it was concluded that nano-Fe3O4 is beneficial to promote the formation of friction film and has certain lubricant effects. However, Nd–Fe–B has double effects on the formation of friction film. It will have positive effects when its content is less than a certain value. Otherwise, it will destroy the structure of friction film. Conclusively, it is believed that this study will be significantly valuable and meaningful for developing new brake materials and improving safety reliability of mechanical brakes. 相似文献