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.     

厌食症儿童发锌铜含量测定

用原子吸收分光光度法测定了５２例厌食症儿童头发中锌、铜的含量,结果表明,厌食症儿童发一明显地对照组。发铜与对照这间无差异。提示厌食症与缺锌有密切关系。     

LCD高温显示缺划研究及改善

LCD工业仪表、汽车仪表等对高温工作性能要求越来越严格,高温工作缺划现象严重影响产品显示效果。结合LCD应用环节中遇到的实际情况,对高温缺划产生的原因展开了研究。通过理论分析和实验验证,找到了高温缺划产生原因在驱动频率和N-LINE设置、液晶电压、盒内杂质离子三个方面。频率和N-LINE设置可以减少直流分量电场的作用,液晶电压可以减少强极性分子,盒内杂质离子少可以减少离子聚集。实验结果表明产品可以解决70℃工作500 h高温缺划现象。参数调整优化有效改善了高温缺划现象,通过改善提高了产品品质,取得了很好的经济效益。     

初产妇血铅的初步研究

采用火焰分光光度法对昆明地区110名初产妇血Pb进行了检测,其结果平均值为1.257μmol/L,高出国际上血Pb的安全阈。     

昆明市区400名学前儿童发铅锌测定及其相关分析

为了解学前儿童头发中铅锌含量及两元素间的关系,采用火焰原子吸收分光光度法对昆明市三所幼儿园４００名学前儿童进行了发中铅锌含量测定。结果表明,发铅≥１０＊１０＾－６者２３２入,占５８％;发锌≤１００＊１０＾－６者２４０人,占６０％铅锌两元素呈负相关。     

基于类型Ⅱ区间模糊集NIE约简算法的优化

类型Ⅱ区间模糊集重新提出后被国内外学者广泛研究。一个重要的研究热点在于它的类型约简之上,如何将类型Ⅱ区间模糊集的经过模糊推理之后约简为Ⅰ型模糊集输出是一个重要的课题。针对NIE-WOEI提出的一种约简方法加以改进,大大提高了算法的精确度并且降低算法的时间复杂度。 更多还原     

用图像处理方法检测人工心瓣开口面积

人工心脏瓣膜投入临床应用前必须经过体外血流动力学性能检测和评价 ,心瓣的开口面积是重要指标之一。介绍的方法是利用计算机控制血液循环系统模拟装置的运动 ,实时采集心瓣开闭过程的图像 ,同时检测流经心瓣的血流量及跨瓣压差 ,利用图像处理方法计算出心瓣开口的实际面积 ,为分析开口面积与流量、压力的关系提供数据