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基于纤维单元和单轴材料本构的多段梁法在钢管结构的滞回性能模拟中得到了广泛应用。利用OpenSees程序和多段梁法,以现有的3个圆钢管轴向加载滞回性能试验为基准,对以下4种常用的单轴材料本构对圆钢管轴向滞回性能模拟的影响进行了研究:不考虑弹塑性过渡段的随动硬化模型、考虑弹塑性过渡段的随动硬化模型、不考虑弹塑性过渡段的混合硬化模型和考虑弹塑性过渡段的混合硬化模型。分别对3个圆钢管的轴向荷载-轴向位移滞回性能进行了试验和数值模拟的对比分析,研究表明,包含弹塑性过渡段的混合硬化单轴材料本构模型能够有效模拟圆钢管的轴向滞回性能,而不考虑弹塑性过渡段的随动硬化单轴材料本构模型不能有效模拟圆钢管的轴向滞回性能;单轴材料本构中弹塑性过渡参数对圆钢管的轴向滞回性能有较大影响,应在模型中考虑;各向同性硬化系数对圆钢管的轴向滞回性能影响不大;不同杆件的单轴材料本构模型参数可能有较大差异,应根据试验数据确定参数取值。

为了使第三代移动通信技术与无线局域网能够最有效地融合,提出了一种新的基于Vague集的多目标决策算法。首先对所提算法的唯一性进行证明,之后针对异构网络中的各个参数值,根据其特点利用不同的公式进行Vague化处理,并利用所提算法对这些处理过的数据进行计算和仿真,最后将仿真结果与传统的模糊集切换算法进行了比较。通过仿真结果的比较可以看出,在异构网络的切换融合中,所提算法更加智能化,同时能更加有效地减少乒乓效应。

在智能电网中,电流测量是电力系统中继电保护、电能计量、系统监测和系统分析的关键,其测量的精度与可靠性直接关系到电力系统能否安全、可靠和经济地运行。文章比较了电磁式电流传感器和光纤电流传感器的性能,介绍了目前3种最主要的光纤电流传感器的测量原理,并指出其各自的优点及存在的问题。同时,综述了国内外关于光纤电流传感器的最新研究现状及进展,最后对光纤电流传感器的应用和研究前景进行了展望。

随着通信技术的快速发展,如何在有限的带宽下实现信息的低成本、大容量的传输引起了人们的广泛关注。文章描述了在40km单模光纤上采用IM/DD（强度调制/直接检测）和OFDM（正交频分复用）技术的40Gbit/s光传输系统的设计,实验中使用的是10Gbit/s级别的EML（电吸收调制激光器）和APD（雪崩光电二极管）。通过MATLAB编程软件实现相关算法,利用VPI仿真软件对系统进行仿真,并对实验结果进行了分析,验证了OFDM技术在未来低成本高速率的光传输网络中应用的可行性。

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大肠癌是目前世界范围内导致癌症相关死亡的重要因素之一, 目前治疗以传统的手术, 化疗及放疗为主, 但效果不佳。近年来, 随着纳米材料在生物医学领域的深入研究及大肠癌分子生物学的发展, 诸多基于纳米材料搭 载特定药物的新兴疗法用于大肠癌的治疗, 包括光热疗法, 磁热疗法, 光动力疗法, 声动力疗法以及化学动力疗法的 应用, 均取得较好效果 [ABSTRACT FROM AUTHOR]

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