Research on a New-style Pipeline Inspection Robot System

IntroductionRecently pipe is used widely on the industry,agriculture and daily life. Natural gas and oil supplybecomes one of the fundamental public services and itsimpact on the urban infrastructure is getting larger. Theurban oil/gas pipelines, as they are buried under theground, are prone to external corrosion usually derived bymoisture and chemical agent in soil, which causes materiallosses of the pipe wall. Also, cracks in the welded regionand the da…     

锗量子点超晶格的光学特性

对自组装生长的Ge量子点超晶格样品进行了光荧光谱(PL谱)和拉曼散射谱(Raman谱)实验测量研究．对Si的TO发光峰和Ge的发光峰特征进行了深入讨论，通过对变温PL谱的拟合及分析提出了对Ge量子点尺寸和其电子有效质量一种新的测评方法；首次在非共振Raman模式下观测到低频声子模，研究了样品的结构组份、应变及声子限制效应问的关联性．     

一种cDNA-5＇末端的克隆方法

应用脱氧核糖核苷酸末端转移酶(TDT)在cDNA 5＇末端加同聚物尾的方法,通过延长加尾时间、改变加尾步骤,大大加强了加尾效率,使得在cDNA末端快速扩增技术(RACE)中应用TDT加尾法进一步获得mRNA的5＇端成为一种行之有效的方法.     

一种新型管道检测机器人系统

摘要：研制了适用于管径为400～650mm的煤气管道内缺陷自动探测系统．该系统由采用远程网络控制技术的管道机器人移动机构、无损检测传感器和地面工作站等组成．综述了管道检测机器人的系统总体设计、关键技术和性能实验．实验结果表明，所研制的管道检测机器人系统在管道中运行平稳，具有稳定的牵引力，其值可达1．404kN，适用于400-650mm管径的油气管道检测．     

一种cDNA—5′末端的克隆方法

应用脱氧核糖核苷酸末端转移酶（TDT）在cDNA 5′末端加同聚物尾的方法，通过延长加尾时间，改变加尾步骤，大大加强了加尾效率，使得在cDNA末端快速扩增技术（RACE）中应用TDT加尾法进一步获得mRNA的5′端成为一种行之有效的方法。     

基于遗传算法的插接管道焊缝扫查机器人能量最小轨迹优化

针对插接管道焊缝扫查机器人末端执行器连续轨迹规划必须满足的运动限制条件，建立了安装高度可调节的全局能量最小优化多目标组合模型，该模型综合考虑了机器人的避障、末端轨迹精度、动力学约束与冗余度能量最小优化问题。基于遗传算法给出了针对该能量最小优化模型的轨迹搜索方法．仿真结果验证了该方法的有效性，并可推广应用到其他类型机器人．     

底板水平布置的连续刚构桥地震反应分析

云南省龙陵至腾冲二级公路上的龙腾大桥,采用变连续刚构桥方案,桥跨布置为58m+102.25m+63m,其桥址位于八度地震区,需要进行抗震设计;依据抗震准则的设计目标,进行了地震作用下的抗震分析,包括自振特性分析,反应谱分析和动态时程分析;并以此为合理的结构抗震设计提供明确的依据。     

基于“问题”研讨会型教学方法改革的研究与实践

该文根据本科应用物理专业材料物理课程的特点与学习的难度,探讨分析了传统教学中存在的问题,同时借鉴启发性教育模式,结合中国学生的特点,实施了一系列的尝试性举措.从几个学期的教学结果来看,达到了比较好的效果.     

Effect of annealing treatments on the microwave electromagnetic properties of amorphous FeCuNbSiB microwires

The amorphous FeCuNbSiB microwires are fabricated by using the melt extraction method and annealed separately at temperatures T = 573, 673, 723 and 773K for 1h. The effect of annealing treatment on the microwave electromagnetic properties of FeCuNbSiB wires/wax composites has been investigated for the first time. It is found that in a frequency range of 0.5--4.0GHz, the complex permittivity, permeability, magnetic and electric loss tangents of FeCuNbSiB wires/wax composites are strongly dependent on the annealing temperature and frequency. For T = 573, 723 and 773K, two resonance peaks are found at frequency f = 1.2 and 3.3GHz. However, for T = 673K, only one resonance peak occurs at f = 3.3GHz. The resonance peak at f = 1.2GHz is believed to be due to the stress-induced anisotropy, while the resonance peak at f = 3.3GHz is attributed to the random anisotropy.     

Strain and Phonon Confinement in Self－Assembled Ge Quantum Dot Superlattices Superlattices ＊

Raman scattering measurements were carried out in self-assembled Ge quantum dot superlattices grown bymolecular beam epitaxy. The characteristics of the Ge-Ge, Si-Ge, Si-SiLoc and Si-Si peaks were investigated,especially the Ge-Ge optical phonon frequency shift was emphasized, which was tuned by the phonon confinementand strain effects. The experimentally observed frequency shift values of the Ge-Ge peak frequency caused byoptical phonon confinement and strain in Ge quantum dots were discussed with quantitative calculations.