联邦滤波在飞机组合导航中的应用

研究了中等精度捷联惯导系统(SINS),大气数据系统(ADS)和塔康系统(TACAN)构成的机载组合导航系统.在分析SINS、ADS、TACAN各自特点的基础上,提出了SISN/ADS/TACAN组合导航系统的联邦滤波方案,并建立了相应的组合导航系统的数学模型.以一条典型的飞行轨迹进行了全航线的仿真研究,仿真结果为:基于联邦滤波的SINS/ADS/TACAN组合导航系统的位置精度约为70 m(CEP),速度精度约为0.75 m/s(1),航向精度为约为 (1)和姿态精度约为 (1),由此可见基于联邦滤波的SINS/ADS/TACAN组合导航系统可以充分利用各机载导航子系统信息,满足飞机导航定位的精度要求.     

表面等离子激元双增强β-NaYF4:Er3+上转换研究

用共沉淀法制备了_β-NaYF_4∶Er~(3+)纳米颗粒.通过化学还原法、晶种生长法分别制备银纳米立方颗粒及金纳米棒,并将其掺杂到_β-NaYF_4∶2%Er~(3+)纳米颗粒中形成复合体系,利用表面等离子激元增强效应分别实现_β-NaYF_4∶Er~(3+)上转换发光的激发和发射增强.当银纳米立方颗粒掺杂量为60μL时,上转换发光强度整体增强4.0倍;当金纳米棒掺杂量为60μL时,上转换发光强度整体增强7.8倍.在此基础上,将两种贵金属纳米颗粒同时掺杂到_β-NaYF_4∶Er~(3+)纳米颗粒材料中,实现了该材料上转换发光激发和发射双增强,上转换发光强度增强了16.0倍.     

LYVE-1 在甲状腺乳头状癌的表达和意义

目的 观察淋巴管透明质酸受体1（LYVE-1）的表达和癌周组织中淋巴管的生成情况在甲状腺恶性肿瘤的变化及转 移中的作用。方法 应用免疫组织化学和real-time PCR方法检测45 例甲状腺乳头状癌中央区、癌周边区和正常甲状腺组织中的LYVE-1及其mRNA 表达情况,并计算淋巴管密度（LVD）。结果 甲状腺乳头状癌周边区LVD 高于甲状腺乳头状癌中央区,而正常组织中很少见LYVE-1 阳性的微淋巴管;甲状腺乳头状癌周边区LVD 与淋巴结转移有密切关系（P＜0.05）。结论 LYVE-1是一种特异性较高的淋巴管内皮特异性标志物,对淋巴管生成促进甲状腺乳头状癌的淋巴结转移。     

掺钕聚甲基丙烯酸甲酯的光学特性

研究了制备的掺钕螯合物Nd(DBM)3Phen材料的吸收光谱、激发光谱、荧光光谱,应用Judd-Ofelt理论计算了该材料的强度参量．分析了钕离子激发态4F3／2的辐射寿命(631 μs)和4F3／2→4IJ′跃迁的受激发射截面和荧光分支比．     

掺铥PLZT透明光电陶瓷的光辐射特性

根据J-O理论研究掺Tm3+的光电陶瓷PLZT的激光潜能，利用Tm3+的420?2000 nm的吸收光谱拟合出了其强度参量，即?2=9.133￡10-21 cm2, ?4=1.529￡10-21 cm2和?6=1.712￡10-21 cm2，进而由强度参量计算了辐射跃迁几率、辐射寿命、荧光分支比和1865 nm荧光峰的受激发射截面等光学参数．     

Amplified Spontaneous Emission of Rhodamine B-Doped Step-Index Polymer Optical Fibre

A step-index polymer optical fibre (SI POF) containing rhodamine B in poly (methyl methacrylate) (PMMA) has been fabricated by a perform technique. The rhodamine B content of the doped SI POF is 5ppm-wt. The spectra of the doped SI POF with different fibre lengths were measured. Amplified spontaneous emission (ASE) at 609 nm of an SI POF in length 40 cm has been observed at ambient temperature by end-pumping with a Nd:YAG laser operated at 532nm. The threshold of absorbed pump power for the onset of ASE is about 0.003mJ.     

二维异质结光子晶体中含近邻点缺陷的弯曲波导的可调谐滤波特性

应用时域有限差分(FDTD)法,对光在二维异质结光子晶体中含两个近邻点缺陷直角弯曲波导的传输特性进行了数值模拟研究。计算结果表明,具有特定本征共振频率的光子晶体微腔(点缺陷),可将在其邻近波导中传播的相同频率成分的光波"引入"到微腔中。"引入"的频率依赖于异质结光子晶体弯曲波导和微腔的参量,从而能够实现调变"引入"频率。通过改变点缺陷周围介质材料(液晶)的折射率或相关介质柱半径,可分别实现约31 nm或12 nm的波长调谐范围。计算结果为光通信中的调谐、上/下载滤波器,提供了一条新的设计思路和依据。     

Polarized Emission of an Eu^3＋ Doped Azo-Polymer Waveguide

We investigate the polarized emission behaviour of an Eu^3 doped azo-polymer waveguide. Affected by the azobenzene groups in the photoinduced orientation process by the 532nm linearly polarized laser, the ligands were realigned orderly perpendicular to the direction of the orientation direction. This leads to the polarized absorption and emission of the waveguide in the orientation direction. By an m-line apparatus based on the prism coupling technique, two guided propagation modes were observed in the waveguide, and the refractive index at 650hm in TE polarizations is 1. 7505.     

AN APPROXIMATE METHOD ON THE CONFORMAL MAPPING FROM A UNIT CIRCLE TO AN ARBITRARY CURVE

In this paper, the conformal mapping problem on the transformation from the interior of a unit circle to the interior of the simply connected region or exterior with an arbitrary curvilinear boundary (including an arbitrary curvilinear cut crack) is discussed. The boundary of the simply connected region is approximated by a polygon. The mapping function from a unit circle to a polygon is founded by using the Schwartz-Christoffel integral. A numerical calculation method to determine the unknown parameters in the Schwartz-Christoffel integral is given.