稀土上转换发光微纳材料的光物理研究

稀土类发光材料由于其丰富的光学特性而具有重要的研究与应用价值。其中,稀土上转换发光材料在近年来尤为受人瞩目,与之相关的研究成果遍布物理、化学、生物、材料和多个交叉领域。有别于大多数发光材料的共性,上转换材料的激发-发射谱峰波长呈现为反斯托克斯位移,因此能够在短波长谱带范围绕过背景噪声且传输发光信息。作为对这一光物理机制的理解运用,人们通过化学方法合成了纳米尺度的稀土上转换发光材料,并且在生物样品荧光显微成像中成功证实了上转换发光标记物的高信噪比检测。以上转换发光微纳材料的光物理性质研究为主题,介绍和梳理了稀土上转换纳米材料在偏振光谱解析、单纳米颗粒超分辨发光成像、微型激光器构筑方面的研究进展。     

Design,fabrication, and characterization of Ti/Au transition-edge sensor with different dimensions of suspended beams

For photon detection, superconducting transition-edge sensor (TES) micro-calorimeters are excellent energy-resolving devices. In this study, we report our recent work in developing Ti-/Au-based TES. The Ti/Au TES devices were designed and implemented with a thickness ratio of 1:1 and different suspended structures using micromachining technology. The characteristics were evaluated and analyzed, including surface morphology, 3D deformation of suspended Ti/Au TES device structure, I-V characteristics, and low-temperature superconductivity. The results showed that the surface of Ti/Au has good homogeneity and the surface roughness of Ti/Au is significantly increased compared with the substrate. The structure of Ti/Au bilayer film significantly affects the deformation of suspended devices, but the deformation does not affect the I-V characteristics of the devices. For devices with the Ti/Au bilayer (150μm×150μm) and beams (100μm×25μm), the transition temperature (T_c) is 253 mK with a width of 6 mK, and the value of the temperature sensitivity α is 95.1.     

CMTS平台往DOCSIS 3．0的演化

（1）市场的动力推动改变视频、语音及数据结合在IP网继续：VoIP、音乐的下载、视频流、互动游戏：电信商采取比较进取的态度．进入IPTV市场：采用FTTN/FTTH及VDSL。     

Ti/Al/Ti/Au与AlGaN欧姆接触特性

研究了溅射 Ti/ Al/ Ti/ Au四层复合金属与 Al Ga N / Ga N的欧姆接触特性 ,并就环境温度对欧姆接触特性的影响进行了分析研究 .试验证实 :溅射的 Ti/ Al/ Ti/ Au与载流子浓度为 2 .2 4× 10 1 8cm- 3的 Al Ga N之间在室温下无需退火即可形成欧姆接触 .随快速退火温度的升高接触电阻降低 .快速退火时间 30 s已可实现该温度下最佳欧姆接触 .当工作温度不高于 30 0℃时接触电阻几乎不受温度的影响     

SnO2薄膜的湿敏效应

报道了用喷雾热分解法在不同温度下制备二氧化锡薄膜,发现其在３２５℃时已晶化,得到四方相多晶ＳｎＯ２。这种薄膜具有明显湿敏效应。测量表明,较高湿度区阻值随湿度变化近似线性,从高湿到低湿平均为每上升１％ＲＨ,阻值下降８．８π,响应速度小于１分钟,阻值恢复较容易。     

谈谈谎言、悖论与逻辑

谎言与逻辑 谎言与逻辑是对立的,不相容的。人们总是使用逻辑学这一科学武器来识别谎言,分析谁是说谎者,或者透过谎言去洞察事实真相。我们试举几例来说明这一点。 1.张三说:“我从来都是说谎”。现在问:张三这句话是真话还是谎言?经过逻辑思维的判断,可以肯定,张三现在说的这句话是谎言。因为张三永远说真话,显然不成立,所以只有两种可能性:张三有时还