由中国分析测试协会和日本国株式会社岛津制作所合办的北京岛津分析中心成立

你想了解最新的岛津分析仪器与技术吗?你想利用这些仪器与技术解决你所面临的问题吗?由中国分析测试协会和日本国株式会社岛津制作所合办的“北京岛津分析中心”将能满足你的愿望,为你提供方便与服务。该中心己于1988年9月10日开业。设在北京市西郊法华寺地矿部地质力学研究所内。在当日举行的仪式     

Tunable and highly sensitive temperature sensor based on graphene photonic crystal fiber

Optical fiber temperature sensors have been widely employed in enormous areas ranging from electric power industry, medical treatment, ocean dynamics to aerospace. Recently, graphene optical fiber temperature sensors attract tremendous attention for their merits of simple structure and direct power detecting ability. However, these sensors based on transfer techniques still have limitations in the relatively low sensitivity or distortion of the transmission characteristics, due to the unsuitable Fermi level of graphene and the destruction of fiber structure, respectively. Here, we propose a tunable and highly sensitive temperature sensor based on graphene photonic crystal fiber (Gr-PCF) with the non-destructive integration of graphene into the holes of PCF. This hybrid structure promises the intact fiber structure and transmission mode, which efficiently enhances the temperature detection ability of graphene. From our simulation, we find that the temperature sensitivity can be electrically tuned over four orders of magnitude and achieve up to ～ 3.34×10^-3 dB/(cm·℃) when the graphene Fermi level is ～ 35 meV higher than half the incident photon energy. Additionally, this sensitivity can be further improved by ～ 10 times through optimizing the PCF structure (such as the fiber hole diameter) to enhance the light-matter interaction. Our results provide a new way for the design of the highly sensitive temperature sensors and broaden applications in all-fiber optoelectronic devices.     

掺质KCl晶体F_A色心电子能级

在计算KCl晶体中的F_A心电子能级时,本文认为是基质和掺质对色心电子云束缚的松紧程度之差确定了电子云分布,据此对三种典型的掺质:Li:KCl:F_A(II);Cu:KCl:F_A(III);Ti:KCl:F_A(III),采用不同的出发点进行计算,结果和实验值比较,误差在5%以内.     

Dielectric Properties of Multilayered Ba0.5Sr0.5TiO3 Thin Films Deposited on ITO-Coated Corning 1737 Glass by rf Magnetron Sputtering

A new stacking method via variation ofsubstrate temperature in rfmagnetron sputter is used to fabricate polycrystalline/polycrystalline Ba0.5Sr0.5TiO3 thin films with higher dielectric constant, higher breakdown strength and lower leakage current densities than those prepared by a conventionM deposition method. The improved figure of merit G （ε0εrEb） of the Ba0.5Sr0.5TiO3 thin films implies that they are a feasible insulation layer for thin film electroluminescent devices.     

一边固定及一角点支承的矩形板在均布荷载作用下的弯曲解

本文采用叠加法求出一边固定及一角点支承的矩形板在均布荷载作用下的弯曲解答,计算表明这种解法收敛速度快,计算精度高。     

斜波导喇曼振荡器

 采用斜波导的喇曼氢气池, 使泵浦激光束在波导内部传播, 增大了受激喇曼散射的作用区域。在传播过程中光束截面逐渐被压缩, 补偿因波导内壁的反射损耗而引起的功率密度下降。在一定气压范围内提高了喇曼转换的效率, 并利用波导对激光束的均匀作用, 使输出的一阶斯托克斯光光强的均匀性获得改善。     

纳米晶Y_2SiO_5∶Eu的浓度猝灭研究

报道了分别用溶胶－凝胶法合成的Ｙ２ＳｉＯ５∶Ｅｕ纳米晶和用高温固相法合成常规尺度的Ｙ２ＳｉＯ５∶Ｅｕ材料的光致发光光谱和猝灭浓度的实验研究．结果表明：纳米Ｙ２－ｘＥｕｘＳｉＯ５比常规尺度的Ｙ２－ｘＥｕｘＳｉＯ５有更高的猝灭浓度和更高的发光亮度．理论分析认为这是由于在纳米材料中能量共振传递被阻断和猝灭中心在各个纳米晶内分布的涨落造成的．这个结果为高亮度的Ｙ２ＳｉＯ５∶Ｅｕ纳米材料的实际开发应用展示了广阔前景．     

液态温度下Na:KCl晶体中F_B(Ⅱ)色心激光的实验研究

介绍了掺Na的KCl晶体中F_B(Ⅱ)心在液氮温度下的稳定激光运转.Q开关Nd:YAG激光的信频输出泵浦色心晶体.激光发射波长为2.420～2.542μm.对实验结果作了讨论.     

荧光动力学的转移函数理论

为描述弱激发条件下存在能量传递的体系中的荧光动力学特性,引进了响应函数和转移函数,并由此建立了新的描述体系动力学过程的系统表述方法。通过一些实例的讨论,表明新方法是系统研究复杂体系荧光动力学的有效手段。 关键词：     

表面吸附K原子的多层FeSe/SrTiO3(001)薄膜的抗磁响应的原位测量

SrTiO₃（001）单晶表面上生长的单层FeSe薄膜显示出了超乎寻常的高温超导电性,其超导增强机制的一个重要因素是电子由衬底转移到了单层FeSe薄膜当中.基于此认识,研究者们在吸附了钾（K）原子的多层FeSe薄膜表面上观察到了类似超导能隙的隧穿能谱和光电子能谱.但这种自上而下的电子掺入方式在多层FeSe薄膜表面上可能引起的高温超导电性,还缺乏零电阻或迈斯纳效应等物性测量实验的直接证实.本研究利用自行研制的一台特殊的多功能扫描隧道显微镜,在生长于SrTiO₃（001）衬底上的多层FeSe薄膜表面上,不但观察到了超导能隙随K吸附量的变化,而且利用原位双线圈互感测量技术,成功地的观察到了该薄膜的抗磁响应,并由此确定了该薄膜样品呈现迈斯纳效应的超导转变温度为23.9 K.其穿透深度随温度的变化呈二次幂指数关系,表明该体系的超导序参量很可能具有S^±配对对称性.