在役管道和管状工件探伤技术及应用概况

管道和管状工件在运行过程中产生的缺陷主要是腐蚀坑和纵向裂纹。介绍用于管道和管状工件的各种探伤方法的原理、应用及其优点和缺点。特别介绍了用于在役管道和管状工件内部扫查的管道探伤设备介入式管道探伤器 Pig、带电缆的 Pig以及内插式探头探伤与测厚方法

丹江口水库马口鱼肠道寄生蠕虫群落结构

从2004年8月到2005年11月在丹江口水库调查的847尾马口鱼(Opsariichthys bidens)肠道内共检得寄生蠕虫14种,其中线虫7种,复殖吸虫4种,棘头虫2种,绦虫1种。该寄生蠕虫群落以广谱性寄生虫为主。杜父鱼驼形线虫(Camallanus cotti)、头槽绦虫(Bothriocephalus acheilognathi)、卡斯杆咽线虫(Rhabdochona cascadilla)和木村小棘吻虫(Micracanthorhynchina motomurai)为群落的核心种。研究结

Preparation of Surface Molecularly Imprinted Magnetic Nanoparticles for Hemoglobin Sensing

以Fe3O4磁性纳米粒子为载体、多巴胺（DA）为功能单体、血红蛋白（Hb）为模板分子，用氯铂酸氧化DA生成聚多巴胺（PDA），同时氯铂酸还原为铂纳米粒子（PtNPs），与Hb一起负载于Fe3O4纳米粒子表面，洗脱Hb后合成了表面分子印迹磁性纳米粒子（印迹Fe3O4/PDA-PtNPs）. 将印迹Fe3O4/PDA-PtNPs修饰于磁性玻碳基底表面，制得印迹Fe3O4/PDA-PtNPs修饰电极. 实验结果表明，印迹Fe3O4/PDA-PtNPs具有良好的水溶性，粒径分布均匀，生成的PtNPs具有良好的导电性和刚性. 用印迹Fe3O4/PDA-PtNPs构建的传感器对Hb具有良好的识别性，在0.14 ~ 2.7 μg·mL-1 Hb浓度范围与交流阻抗变化值呈良好的线性关系，检出限（S/N=3）为0.05 μg·mL-1.Surface molecularly imprinted magnetic nanoparticles (NPs) were prepared by employing dopamine (DA) as a functional monomer, hemoglobin (Hb) as a template, H2PtCl6 as an oxidant triggered DA polymerization on the surface of the Fe3O4 NPs. The Hb and the formed platinum nanoparticles (PtNPs) were embedded into the polydopamine (PDA). After removal of the Hb, the surface molecularly imprinted magnetic nanoparticles (imprinted Fe3O4/PDA-PtNPs) were formed, and then simply immobilized on the magnetic glassy carbon electrode (imprinted Fe3O4/PDA-PtNPs/MGCE) for Hb sensing. The imprinted Fe3O4/PDA-PtNPs were demonstrated magnetic spherical shape with good solubility in water and narrow size distribution. The PtNPs embedded in the imprinted coating could effectively promote the conductivity and the mechanical strength of imprinted cavity. In addition, the imprinted Fe3O4/PDA-PtNPs/MGCE could selectively recognize Hb and was used to detect Hb in the range of 0.14 ~ 2.7 μg?mL-1 with a detection limit of 0.05 μg?mL-1 (S/N=3).国家自然科学基金项目（Nos. 21163014, 21265017）资助作者联系地址：1. 南昌大学化学系，江西 南昌 330031； 2. 井冈山大学化学化工学院，江西 吉安 343009Author's Address: 1. Department of Chemistry, Nanchang University, Nanchang 330031, China; 2. School of Chemistry and Chemical Engineering, Jinggangshan University, Ji’an 343009, Jiangxi, China通讯作者E-mail：[email protected]

丹江口水库马口鱼肠道寄生蠕虫群落结构

从2004年8月到2005年11月在丹江口水库调查的847尾马口鱼(Opsariichthys bidens)肠道内共检得寄生蠕虫14种,其中线虫7种,复殖吸虫4种,棘头虫2种,绦虫1种.该寄生蠕虫群落以广谱性寄生虫为主.杜父鱼驼形线虫(Camallanus cotti)、(鳙)头槽绦虫(Bothriocephalus acheilognathi)、卡斯杆咽线虫(Rhabdochona cascadilla)和木村小棘吻虫(Micracanthorhynchina motomurai)为群落的核心种.研究结果表明,寄生蠕虫群落随着马口鱼的体长和食性的改变而发生显著的变化.群落核心种的感染强度与马口鱼体长呈显著性相关.种间相关性分析表明群落结构呈非随机组合,种间感染强度存在显著的相关性.同时群落种间关系受到马口鱼的体长和食性以及季节变化的显著影响.群落种群间在宿主较大个体或夏秋季节中更容易形成显著的种间相关性

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies