By studying the variations of balloon height and of wind-ing radius in any one winding layer of ring spinning, the formula for determining the winding tension in any layer is derived, and then the overall tension vari...By studying the variations of balloon height and of wind-ing radius in any one winding layer of ring spinning, the formula for determining the winding tension in any layer is derived, and then the overall tension variation throughout all winding layers can be computed. A meth-od of measuring the winding tension is also introduced here, with the measured results agreeing with the com-puted ones, and so the reliable relationship between winding tension, speed and ring traveller weight can be thus obtained. The highest allowable spindle speed is also discussed.展开更多
This paper reports a systematic experimental investigation on the dynamics in the low-frequency region in an erbium-doped fibre-ring laser with loss modulation. A rich variety of bifurcation is analyzed through the bi...This paper reports a systematic experimental investigation on the dynamics in the low-frequency region in an erbium-doped fibre-ring laser with loss modulation. A rich variety of bifurcation is analyzed through the bifurcation diagram and structured with the concept of the winding numbers. The coexistence of multiple attractors and the crisis that appear in the saddle-node bifurcations, and an interesting structure of bifurcation which is similar to the bifurcations in high-frequency range, have been observed.展开更多
本文研究了2000年10月5日磁暴主相两个不同时段期间环电流的变化速度与相应太阳风参数的关系.研究发现,磁暴主相期间环电流的变化速度并不取决于行星际磁场南向分量的平均值和最大值,也不取决于太阳风电场的平均值和最大值.本文的研究证...本文研究了2000年10月5日磁暴主相两个不同时段期间环电流的变化速度与相应太阳风参数的关系.研究发现,磁暴主相期间环电流的变化速度并不取决于行星际磁场南向分量的平均值和最大值,也不取决于太阳风电场的平均值和最大值.本文的研究证明,磁暴环电流增强期间环电流的变化速度,不仅取决于行星际磁场南向分量和太阳风的速度,还取决于太阳风的动压,而且太阳风的动压起着非常重要的作用.研究还发现,采用Burton et al.(1975)方程和O′Brien,McPherron (2000a)方程估算得到的2000年10月5日的两次地磁活动的强度远低于实际的观测值.展开更多
为提升复杂电磁环境下风机滑环过程现场总线(Process Field Bus,Profibus)通信传输的稳定性与可靠性,围绕硬件、软件及工程安装维护等层面进行了系统研究。通过归纳风机滑环通信过程中常见的干扰类型及其成因,构建了涵盖信号传输路径优...为提升复杂电磁环境下风机滑环过程现场总线(Process Field Bus,Profibus)通信传输的稳定性与可靠性,围绕硬件、软件及工程安装维护等层面进行了系统研究。通过归纳风机滑环通信过程中常见的干扰类型及其成因,构建了涵盖信号传输路径优化、电磁兼容设计以及协议层抗干扰算法的综合技术体系,并在大型风电场与分布式小型风机中开展应用实践。结果表明,所提出的多层屏蔽、滤波抑制、波特率自适应调整及通信质量动态切换等措施显著降低了误码率,减少了中断次数,提高了响应速度与传输成功率。研究表明,该体系可有效应对滑环旋转与环境噪声带来的干扰,为风电机组的长期稳定运行提供可行方案。展开更多
文摘By studying the variations of balloon height and of wind-ing radius in any one winding layer of ring spinning, the formula for determining the winding tension in any layer is derived, and then the overall tension variation throughout all winding layers can be computed. A meth-od of measuring the winding tension is also introduced here, with the measured results agreeing with the com-puted ones, and so the reliable relationship between winding tension, speed and ring traveller weight can be thus obtained. The highest allowable spindle speed is also discussed.
文摘This paper reports a systematic experimental investigation on the dynamics in the low-frequency region in an erbium-doped fibre-ring laser with loss modulation. A rich variety of bifurcation is analyzed through the bifurcation diagram and structured with the concept of the winding numbers. The coexistence of multiple attractors and the crisis that appear in the saddle-node bifurcations, and an interesting structure of bifurcation which is similar to the bifurcations in high-frequency range, have been observed.
文摘本文研究了2000年10月5日磁暴主相两个不同时段期间环电流的变化速度与相应太阳风参数的关系.研究发现,磁暴主相期间环电流的变化速度并不取决于行星际磁场南向分量的平均值和最大值,也不取决于太阳风电场的平均值和最大值.本文的研究证明,磁暴环电流增强期间环电流的变化速度,不仅取决于行星际磁场南向分量和太阳风的速度,还取决于太阳风的动压,而且太阳风的动压起着非常重要的作用.研究还发现,采用Burton et al.(1975)方程和O′Brien,McPherron (2000a)方程估算得到的2000年10月5日的两次地磁活动的强度远低于实际的观测值.
文摘为提升复杂电磁环境下风机滑环过程现场总线(Process Field Bus,Profibus)通信传输的稳定性与可靠性,围绕硬件、软件及工程安装维护等层面进行了系统研究。通过归纳风机滑环通信过程中常见的干扰类型及其成因,构建了涵盖信号传输路径优化、电磁兼容设计以及协议层抗干扰算法的综合技术体系,并在大型风电场与分布式小型风机中开展应用实践。结果表明,所提出的多层屏蔽、滤波抑制、波特率自适应调整及通信质量动态切换等措施显著降低了误码率,减少了中断次数,提高了响应速度与传输成功率。研究表明,该体系可有效应对滑环旋转与环境噪声带来的干扰,为风电机组的长期稳定运行提供可行方案。
