电缆网络故障频发会给社会生产与生活造成严重的经济损失和安全隐患,因此需要对电缆网络进行实时监控以确保其正常运行。提出了利用多路宽带准正交的混沌脉冲位置调制信号(Chaotic Pulse Position Modulation,CPPM)结合分布式检测方法...电缆网络故障频发会给社会生产与生活造成严重的经济损失和安全隐患,因此需要对电缆网络进行实时监控以确保其正常运行。提出了利用多路宽带准正交的混沌脉冲位置调制信号(Chaotic Pulse Position Modulation,CPPM)结合分布式检测方法进行电缆网络故障检测,通过对构建的Double-Y形网络中的故障进行检测,从而证明该方法的可行性。实验结果表明:该方法不仅能够有效解决单端检测中故障定位模糊的问题,而且能够克服分布式检测中信号相互干扰的问题,准确高效地对电缆网络故障进行定位,并能够进行在线检测,在测量范围达到850m时,相对误差小于2.3%。展开更多
In the present work,we extend the Coulomb and Proximity Potential Model(CPPM)to study two-proton(2p)radioactivity from excited states while the proximity potential is chosen as AW95 proposed by Aage Withner in 1995.De...In the present work,we extend the Coulomb and Proximity Potential Model(CPPM)to study two-proton(2p)radioactivity from excited states while the proximity potential is chosen as AW95 proposed by Aage Withner in 1995.Demonstration reveals that the theoretical results acquired by CPPM exhibit a high level of consistency with prior theoretical models such as the unified fission model(UFM),generalized liquid-drop model(GLDM)and effective liquid-drop model(ELDM).Furthermore,within the CPPM,we predicted the half-lives of potential 2p radioactive nuclei for which experimental data are currently unavailable.The predicted results were then assessed,compared with UFM,ELDM and GLDM models,and examined in detail.展开更多
文摘地铁隧道围岩的非线性、非均质、不连续性等特点,难以给出准确的围岩力学参数。引入智能优化算法——差异进化算法(Differential Evolution,DE)到反分析方法中,该算法在搜索成功率和计算效率上有很大的优势,对初始值无要求、受控变量较少、收敛速度快、自适应性好等优点;最近点投射算法(Closest Point Projection Method,CPPM)是本构积分算法的一种,可避免预测应力漂移屈服面的现象,具有精确性和稳定性等特点,迭代计算中使用Newton-Raphson法可获得近似平方的收敛速度。基于Drucker-Prager模型的最近点投射算法和差异进化算法原理,综合2个算法的优势,从优化算法的选择和调用的正算程序2个方面考虑,建立了弹塑性智能位移反分析DE-CPPM方法。采用C++语言自主开发了全套智能位移反分析程序,并将其应用于在建大连地铁1号线试验线路海事大学段隧道工程。结果表明了该方法的可行性和正确性,及程序的高精度性和实用性,为在建大连地铁隧道后期施工提供了参考和帮助。
文摘电缆网络故障频发会给社会生产与生活造成严重的经济损失和安全隐患,因此需要对电缆网络进行实时监控以确保其正常运行。提出了利用多路宽带准正交的混沌脉冲位置调制信号(Chaotic Pulse Position Modulation,CPPM)结合分布式检测方法进行电缆网络故障检测,通过对构建的Double-Y形网络中的故障进行检测,从而证明该方法的可行性。实验结果表明:该方法不仅能够有效解决单端检测中故障定位模糊的问题,而且能够克服分布式检测中信号相互干扰的问题,准确高效地对电缆网络故障进行定位,并能够进行在线检测,在测量范围达到850m时,相对误差小于2.3%。
基金supported by the National Natural Science Foundation of China(Nos.12175100 and 11975132)the Construct Program of the Key Discipline in Hunan Province,the Research Foundation of Education Bureau of Hunan Province,China(No.18A237)+1 种基金the Natural Science Foundation of Hunan Province,China(No.2018JJ2321)the Innovation Group of Nuclear and Particle Physics in USC,the Opening Project of Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment,University of South China(No.2019KFZ10).
文摘In the present work,we extend the Coulomb and Proximity Potential Model(CPPM)to study two-proton(2p)radioactivity from excited states while the proximity potential is chosen as AW95 proposed by Aage Withner in 1995.Demonstration reveals that the theoretical results acquired by CPPM exhibit a high level of consistency with prior theoretical models such as the unified fission model(UFM),generalized liquid-drop model(GLDM)and effective liquid-drop model(ELDM).Furthermore,within the CPPM,we predicted the half-lives of potential 2p radioactive nuclei for which experimental data are currently unavailable.The predicted results were then assessed,compared with UFM,ELDM and GLDM models,and examined in detail.
