Application of transcutaneous diffuse reflectance spectroscopy in the measurement of blood glucose concentration

In this paper, the propagation characteristics of near-infrared (NIR) light in the palm tissue are analyzed, and the principle and feasibility of using transcutaneous diffuse reflectance spectroscopy for non-invasive blood glucose detection are presented. An optical probe suitable for measuring the diffuse reflectance spectrum of human palm and a non-invasive blood glucose detection system using NIR spectroscopy are designed. Based on this system, oral glucose tolerance tests are performed to measure the blood glucose concentrations of two young healthy volunteers. The partial least square calibration model is then constructed by all individual experimental data. The final result shows that correlation coefficients of the two experiments between the predicted blood glucose concentrations and the reference blood glucose concentrations are 0.9870 and 0.9854, respectively. The root mean square errors of prediction of full cross validation are 0.54 and 0.52 mmol/1, respectively.     

一种改进的Ford算法

针对不含负回路网络中最短路Ford算法运算量大、直观性差的不足,引入表上作业法思想,从提高算法效率和增强计算直观性2个方面对其进行改进,并给出新的算法。新算法既能快速计算最短路权又能更直观地表现解题过程,是一种计算最短路的简捷方法。仿真结果和算例表明了新算法的有效性。     

掺Gd~(3 ),Y~(3 )对PbWO_4低温热释光的影响

通过热释光方法研究了PbWO4 (PWO), PWO:Y3+, PWO:Gd3+多晶粉末及PWO,PWO:Y单晶的低温(<300K)热释光现象.多晶粉末中，掺杂Y3+或Gd3+都会大大降低甚至消除200K附近的热释光峰，同时产生新的热释光峰，分别位于125和150K（掺Y掺Gd）.这表明掺三价离子除了起到电荷补偿作用以减少Pb3+，O-浓度外，还可以产生新的陷阱能级.对于PWO:Y单晶，掺杂Y3+可以消除253K的热释光峰，即消除较深(～0.89eV)的陷阱,但PWO单晶中较浅的陷阱(～0.42eV)对应130K热释光峰仍然存在，对此进行讨论，它最可能源于氧空位缺陷.根据Pb3+，Gd3+，Y3+的电子库仑势不同，在PWO晶体中替代Pb2+后形成的电子陷阱深度有别（EPb>EGd>EY），从而解释了相应的热释光峰值温度的不同.     

Medium-Range Order Structure and Fragility of Superheated Melts of Amorphous CuHf Alloys

The structural factors of amorphous CuHf alloys at different temperatures are determined by using a high temperature x-ray diffractometer. It is found that not only the short-range order structure but also the medium-range order structure exists in amorphous CuHf alloys. The dynamic viscosities of CuHf alloy melts are measured by a torsional oscillation viscometer. The fragility of superheated melts of CuHf alloys is calculated based on the viscosity data. The experimental results show that the glass-forming ability of the CuHf alloys is closely related to the fragility of their superheated melt. The relationship between the medium-range order structures and the fragility of superheated melts has also been established in amorphous CuHf alloys. In contrast to the fragility of supercooled liquids, the fragility of superheated liquids promises a better approach to reflecting the dynamics of glass forming liquids.     

A Novel Nano-Grating Structure of Polarizing Beam Splitters

A metal wire nanograting is fabricated and used as a polarizing beam splitter that reflects TE polarization and transmits TM polarization. The metal wire nanograting is based on a fully optimized design structure that consists of not only the core nanowire metal grid but also the substrate nanograting. The substrate nanograting is designed to provide better performance for both TM and TE polarizations. We fabricate metal-stripe gratings on a glass substrate using nanoimprint lithography and reactive ion etching process. A detailed investigation of the polarization effect at 1550 nm wavelength is carried out with the theoretical analysis and experimental results. The polarizing beam splitter has uniform performance with wide variations in the incident angle （±25） and has high efficiency for both the reflected and the transmitted beams.     

基于边缘方向信息的主动轮廓算法

提出一种基于边缘方向信息的改进型主动轮廓算法ＭＡＣＡ（ＭｏｒｉｆｉｅｄＡｃｔｉｖｅＣｏｎｔｏｕｒＡｌｇｏｒｉｔｈｍ）．在Ｓｎａｋｅ模型的基础上加入２项基于匹配要求的新的能量函数，用ＦＧＡ（ＦａｓｔＧｒｅａｄｙＡｌｇｏｒｉｔｈｍ）迭代能量函数使其快速收敛．对轮廓曲线的一阶和二阶导数、搜索区域、轮廓的重抽样作锁定．实验结果表明ＭＡＣＡ比Ｓｎａｋｅ更具有凹状目标轮廓提取和目标同一性判别的能力     

二醋酸纤维素的X-射线衍射研究

本文将二醋酸纤维素溶于丙酮使其重结晶,利用X-射线衍射方法,研究了二醋酸纤维素的晶胞参数,实验结果表明,二醋酸纤维素为正交晶系,a=24.5×10~(-10)m,b=11.6×10~(-10)m,c=10.43×10~(-10)m。     

移动电话基站位置的偏移与干扰

对爱立信三叶草小区模式３／９，４／１２和７／２１进行了预测，得出了站址在４个不同的方向（０°，９０°，１８０°，２７０°）偏移站间距离的１０％，１５％，２５％，３９％各种不同情况下的结果，以及在允许的Ｃ／Ｉ值下站址最大的偏移误差。     

摩擦学中的表面效应

在摩擦学的研究中,表面状态是一个核心问题.表面的几何形状、粗糙程度以及参与摩擦运动的材质对摩擦和磨损的影响属于宏观的范畴,本文不再涉及.这里讨论的是摩擦表面的原子本质,特别是接触过程中粘附的微观过程及表面状态对摩擦过程的影响. 由于超高真空系统及各种表面分析仪器