激光辐照对长波HgCdTe光导探测器电学参数的影响

对长波HgCdTe光导探测器进行了低于其永久损伤阈值的变功率激光辐照,测量辐照前后器件的电阻-温度特性,用电阻-温度特性研究材料参数的方法对实验结果进行拟合,结果表明辐照后HgCdTe探测器件的组分变大,并由此计算得到探测器性能突变后,器件的电子迁移率与电子浓度均有一定程度减小.认为这可能是由于激光辐照的热效应使N型HgCdTe光导器件的表面及体内均产生的一定的变化所致.     

单片机技术在智能垃圾箱中的应用

详细介绍了如何利用51单片机设计制作智能垃圾箱。它以STC89C52为控制核心,利用传感器检测环境信息进行判断,由单片机驱动程序执行相应的组件,操作来控制箱盖的打开或关闭,无需人工操作箱体上的盖子,从而避免了传统手动开关盖子的不便和危害。     

Ti/WSi/Ni ohmic contact to n-type SiCN

Ti/WSi/Ni contact to n-type SiCN was investigated using the circular transmission line method. Current–voltage characteristics, X-ray diffraction and X-ray photoelectron spectroscopy were used to characterize the contacts before and after annealing. It is shown that the conducting behavior of the contacts is dependent on the annealing temperature. After annealing at 900 ℃ or above, ohmic contacts with specific contact resistivity were achieved. The 1000-℃-annealed contact exhibits the lowest specific contact of 3.07E-5 Ω? cm2. The formation of ohmic contact with low specific contact resistivity was discussed.     

潮流能水轮机单向流固耦合计算方法

基于ANSYS和CFX软件实现了垂直轴潮流能水轮机单向流固耦合瞬态计算。将二维CFX流体计算结果作为水轮机受力,将流体与结构中相对应的节点压力施加到结构有限元模型上,从而完成水轮机工作状态主轴应变计算。将计算结果与实验结果进行对比发现二者吻合较好,说明单向流固耦合方法是将流体计算结果传递到结构分析的有效方法,在潮流能水轮机叶片小变形的条件下能够准确的预报结构响应的趋势,有效的计算垂直轴水轮机的结构强度,对其结构校核起到很好的指导作用     

强噪声干扰环境中的雷达无源定位研究

在强器材怕干扰环境中,将邻近２～３部受干扰的陆基雷达,从主动探测转入被动探测工作,利用干扰信号对这人中干扰平台进行无源空位是可能的。本文探讨了它的若干技术问题、定位原理与算法,为多目标恶劣电磁环境下,陆基雷达坚持不间断对空情报作战,提供了一条新的可能的技术机制和作战手段。     

基于3D-DCT和SVD的鲁棒彩色图像水印算法

在数字图像水印领域,水印算法主要集中于灰度图像,且提出的大部分彩色图像水印算法往往仅在亮度分量或在彩色图像的每一通道中嵌入水印,未能充分利用彩色图像的冗余空间,影响了水印的透明性和鲁棒性。针对此问题,提出了一种新颖的基于三维离散余弦变换和奇异值分解的彩色图像水印算法。算法先对水印图像进行预处理和对彩色图像进行互不重叠的分块;其次对每一分块进行三维离散余弦变换;最后选择对三维离散余弦变换系数的第一分量进行奇异值分解。嵌入水印时,对三维离散余弦变换系数第一分量的最大奇异值和第二分量分别采用量化和关系的嵌入方法嵌入水印。提取水印时,分别采用量化和关系提取算法提取水印并进行比较,选取相似值高的水印图像作为最终提取的水印。实验结果表明,提出的算法具有较好透明性的同时,具有抵抗常规信号处理和模糊、扭曲及锐化等攻击的能力。     

空心高墩施工刍议

主要阐述了空心高墩施工方法。以乌溪河特大桥为例介绍了分段浇筑模板的安装,具体从空心高墩施工过程中的钢筋安装、模板倒用、混凝土的浇筑、顶帽底模的安装以及测量控制等方面进行了叙述。     

ERP技术在机场生产运营调度系统中的运用

本文首先分析了我国机场生产运营调度系统中普遍存在的问题和产生这些问题的原因，然后介绍了ERP基本原理，接着讨论如何运用ERP对现有的生产运营调度系统进行改造，包括具体的改进方案及其技术实现。最后，对ERP在机场中的应用前景进行了探讨。     

Adsorption behavior of ytterbium (Ⅲ) on gel-type weak acid resin

The adsorption and desorption behaviors of Yb(Ⅲ) on gel-type weak acid resin (110) were investigated. The influence of operational conditions such as contact time,initial concentration of Yb(Ⅲ),initial pH of solution and temperature on the adsorption of Yb(Ⅲ) were also examined. The results showed that the optimal adsorption condition of 110 resin for Yb(Ⅲ) was achieved at pH=5.5 in HAc-NaAc medium. The maximum uptake capacity of Yb(Ⅲ) was 265.8 mg/g at 298 K. Yb(Ⅲ) could be eluted by using 3.0 mol/L HCl solution and the 110 resin could be regenerated and reused. The adsorption of Yb(Ⅲ) followed the Langmuir isotherm,and the correlation coefficients were evaluated. Various thermodynamic parameters such as standard enthalpy change (△H),standard entropy change (△S) and standard free energy change (△G) were evaluated. The adsorption of Yb(III) on the 110 resin was found to be endothermic in nature. Thomas model was successfully applied to experimental data to predict the breakthrough curves and to determine the characteristics parameters of the column useful for process design. And the resin sample both before and after adsorption was described by IR spectroscopy.