47 research outputs found

    辣根过氧化物酶标记电化学聚合间苯二胺膜的研制

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    探讨了电聚合间苯二胺(PDA)膜的电化学聚合、活化及偶联辣根过氧化物酶(HRP)的条件及其性能,结果表明:制成的膜较薄(<1.0μm),在电极表面结合牢固,电聚合膜上有较多可供生物活性材料偶联的氨基,经戊二醛共价交联在膜上的HRP与膜结合牢固,在样品检测中性能稳定,重现性较好,使用及保存寿命较长,是制备生物传感器的良好膜材料,可望在免疫电极及微型电极方面应用

    辣根过氧化物酶标间苯二胺膜电极的研制

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    目前,用作传感器的功能膜材料不多,见诸文献的有:测定梅毒抗体的醋酸乙烯膜,测定二硝基酚(DNP)的聚氯乙烯膜,测定人体免疫球蛋白IgG的聚苯乙烯活性膜等。本文采用电化学聚合方法形成间苯二胺膜,并探讨了电化学聚合、活化、偶联制备辣根过氧化物酶标膜电极的实验条件及其性能。实验证明:聚合膜具有较多的供生物材料偶联的氨基,制成的膜极薄,在电极表面结合牢固,具有抗碱及非氧化性酸腐蚀的

    Artificial local magnetic field inhomogeneity enhances T2 relaxivity

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    磁性探针作为分子影像技术中的磁共振成像(MRI)造影剂在医学诊断中发挥着重要作用。为满足实际诊断中的准确性和精确性要求,科研工作者们长期致力于发展高性能的MRI造影剂以降低高剂量的使用带来的潜在风险。该文章指出了探针聚集体中局域磁场不均匀性是影响T2弛豫效能的关键因素。该文章首次利用磁场不均匀性因素阐明了单个探针和它们聚集体的MRI造影剂之间的相互关系,将可能成为弥补探针聚集体的造影剂理论的空白,并为发展新型高效的MRI造影剂提供重要参考。 该论文共同第一作者为博士后周子健和博士生田蕊,通讯作者为陈小元教授和聂立铭博士,部分工作得到我校物理学系王瑞方教授和化学化工学院高锦豪教授的支持。【Abstract】Clustering of magnetic nanoparticles (MNPs) is perhaps the most effective, yet intriguing strategy to enhance T2 relaxivity in magnetic resonance imaging (MRI). However, the underlying mechanism is still not fully understood and the attempts to generalize the classic outersphere theory from single particles to clusters have been found to be inadequate. Here we show that clustering of MNPs enhances local field inhomogeneity due to reduced field symmetry, which can be further elevated by artificially involving iron oxide NPs with heterogeneous geometries in terms of size and shape. The r2 values of iron oxide clusters and Landau–Lifshitz–Gilbert simulations confirmed our hypothesis, indicating that solving magnetic field inhomogeneity may become a powerful way to build correlation between magnetization and T2 relaxivity of MNPs, especially magnetic clusters. This study provides a simple yet distinct mechanism to interpret T2 relaxivity of MNPs, which is crucial to the design of high-performance MRI contrast agents.This work was supported by the National Science Foundation of China (81571744 and 81601489), the National Basic Research Program of China (863 Program 2015AA020502), the Fundamental Research Funds for the Central Universities (20720170065), the Science Foundation of Fujian Province (No. 2014Y2004), and by the Intramural Research Program (IRP), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH). 研究工作得到了国家自然科学基金委、国家高技术研究发展计划863项目、福建省重大研发平台项目和美国NIH Intramural Research Program的资助

    Artificial local magnetic field inhomogeneity enhances T2 relaxivity

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    磁性探针作为分子影像技术中的磁共振成像(MRI)造影剂在医学诊断中发挥着重要作用。为满足实际诊断中的准确性和精确性要求,科研工作者们长期致力于发展高性能的MRI造影剂以降低高剂量的使用带来的潜在风险。该文章指出了探针聚集体中局域磁场不均匀性是影响T2弛豫效能的关键因素。该文章首次利用磁场不均匀性因素阐明了单个探针和它们聚集体的MRI造影剂之间的相互关系,将可能成为弥补探针聚集体的造影剂理论的空白,并为发展新型高效的MRI造影剂提供重要参考。 该论文共同第一作者为博士后周子健和博士生田蕊,通讯作者为陈小元教授和聂立铭博士,部分工作得到我校物理学系王瑞方教授和化学化工学院高锦豪教授的支持。【Abstract】Clustering of magnetic nanoparticles (MNPs) is perhaps the most effective, yet intriguing strategy to enhance T2 relaxivity in magnetic resonance imaging (MRI). However, the underlying mechanism is still not fully understood and the attempts to generalize the classic outersphere theory from single particles to clusters have been found to be inadequate. Here we show that clustering of MNPs enhances local field inhomogeneity due to reduced field symmetry, which can be further elevated by artificially involving iron oxide NPs with heterogeneous geometries in terms of size and shape. The r2 values of iron oxide clusters and Landau–Lifshitz–Gilbert simulations confirmed our hypothesis, indicating that solving magnetic field inhomogeneity may become a powerful way to build correlation between magnetization and T2 relaxivity of MNPs, especially magnetic clusters. This study provides a simple yet distinct mechanism to interpret T2 relaxivity of MNPs, which is crucial to the design of high-performance MRI contrast agents.This work was supported by the National Science Foundation of China (81571744 and 81601489), the National Basic Research Program of China (863 Program 2015AA020502), the Fundamental Research Funds for the Central Universities (20720170065), the Science Foundation of Fujian Province (No. 2014Y2004), and by the Intramural Research Program (IRP), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH). 研究工作得到了国家自然科学基金委、国家高技术研究发展计划863项目、福建省重大研发平台项目和美国NIH Intramural Research Program的资助

    Challenge by Head Transplant

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    范瑞平:诸位好!受《中国医学伦理学》杂志王明旭主编所托,组织一篇"换头术的挑战"争鸣笔谈,特邀各位参与。请踊跃发表意见,观点不拘,长短不限,畅所欲言,各抒己见,若能针对已发观点形成争论,则更能增加读者兴趣

    我国上市公司资本结构影响因素实证分析

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    随着资本市场的逐渐完善,企业必须注重如何通过有效的资本运营实现企业的最佳资本结构。研究对我国上市公司资本结构形成的影响因素作一些理论上的探索,然后对沪深两市近50家上市公司的年报数据进行分析,运用主成分分析和多元回归相结合的方法对其资本结构形成可能的影响因素加以实证检验,并得出了比较合理的结论

    Design and Research on Motion Controller of Grinding and Polishing Robot

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    本文设计了研磨抛光机器人运动控制器的核心硬件结构和软件模块,采用了参数模糊自整定PID机器人关节位置控制策略,通过实验表明该运动控制器可以大大降低研磨抛光机器人的位置跟踪误差。建立的模块化的软件体系,便于运动控制器的维护和扩展,并可将其应用到其它工业机器人上

    自旋波在十字交叉形磁性纳米线中的微磁模拟研究

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    由铁磁性纳米线组成的自旋波导线路将不可避免地发生线路交叉。在交叉区域磁矩呈现明显不均匀分布,它对自旋波的散射作用可以等效地视为一个自旋波"势垒"。文章通过微磁模拟方法研究了在不同交变频率外场激发的自旋波在十字交叉形坡莫合金纳米线中的传播特性,发现势垒对自旋波传播的影响与场源频率有关

    Research on prognostics technology of robot system

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    文章针对机器人系统维护特点,提出将故障预测与健康管理(PHM)技术应用到机器人系统的维护上。论述了PHM关键技术&mdash;&mdash;故障预测技术的特点和研究内容。对故障预测技术进行分类和分析,总结出各种预测方法的特点。最后提出了基于统计过程控制(SPC)进行故障预测的方法,并阐述了进一步研究可能遇到的问题

    Research on Prognostics Technology of Robot System Based on Statistical Process Control

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    针对机器人系统维护特点,提出将故障预测与健康管理(PHM)技术应用到机器人系统的维护上。论述了PHM关键技术&mdash;&mdash;故障预测技术的特点和研究内容,对故障预测技术进行分类和分析。最后提出了基于统计过程控制(SPC)进行故障预测的方法,描述了其控制图的原理和判断准则,并利用实际过程能力指数进行预测,阐述了进一步研究可能遇到的问题
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