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从光纤拉丝炉、光纤退火和光纤冷却等方面进行了分析,阐述了高速拉丝的工艺基础。从拉丝炉温场和气流场角度出发,探索了光棒直径与中心管直径的匹配范围;同时对光纤保温炉的温度和距离进行了摸索确定,可以有效提高光纤翘曲度,降低断纤率;光纤冷却用氦气流量在10slm以上时,可以保证光纤内涂层的直径及光纤的微弯损耗。通过对上述参数的探索,确定了一套超高速拉丝的稳定工艺,实现了提速增效。

介绍了国际上低损耗单模光纤的研究进展,从理论上分析了低损耗单模光纤实现的技术途径。通过对石英玻璃物理特性的研究,探索出石英玻璃光纤的退火工艺,以降低光纤的内应力从而降低光纤的衰减。采用自主知识产权的专利技术制造的光纤在1 310、1 550和1 625nm波长的衰减典型值分别为0.320、0.182和0.195dB/km。该光纤的技术指标优于ITU-T国际标准和GB/T规定的光纤指标值。

以上海辰山植物园铝合金展览温室为背景,研究摩擦系数对结构性能的影响。与常规结构滑动支座不同,该项目滑动支座条件复杂。滑动支座数量众多,并形成一闭合回路,同时各支座不在一个水平标高上,因此滑动支座的性能对整个结构的影响较大。通过程序分析,研究不同支座摩擦系数下结构的受力和变形性能,从而为支座构造的设计提供技术参数。通过研究发现,当支座摩擦系数小于0.01时,杆件内力与理想无摩擦情况误差小于5%,可以不用考虑摩擦力对结构性能的影响,设计时释放支座相应的自由度即可。

无锡大剧院屋顶钢结构采用管桁架空间结构体系,其中大跨度、大悬挑、曲线杆件等均为非常规设计。对该结构的设计理念及技术进行了全面的阐述,如结构体系的选择、设计难点及重点部位的处理技术等关键问题,旨在给类似项目提供一定的借鉴。通过对结构的详细计算分析,表明该项目对结构特殊部位的处理方式是合理的,既满足了结构受力和变形性能的要求,同时也极大地迎合了业主和建筑师对建筑效果的追求。通过对结构风洞试验和节点试验的研究,进一步验证了结构设计和节点设计的合理性和安全性。

无锡太湖生态博览园建筑创意为12个巨大的"盒子"结构,分5层堆砌而成。竖向构件不连续导致竖向荷载、水平荷载的传递机制非常复杂。从结构概念设计着手,通过研究荷载的传递机制来对结构体系进行优化,确保结构的安全和建筑效果的统一。通过结构优化和计算分析,结构在竖向荷载、水平荷载作用下的性能均能满足国家相关规范的要求,同时合理的构造处理保证了结构荷载传递的安全性和可靠性。

讨论由光纤光栅和光环行器构成的光分插复用器的结构、性能和特点。提出采用一段刻有多个光纤布拉格光栅的光纤、两个光环行器、ＷＤＭ 复用器和解复用器等器件，构造能够对ＷＤＭ 的多个信道实施分插操作的光分插复用器。该光分插复用器的插入损耗要比简单地把多个单路的光分插复用器进行级联时小得多。波分复用全光网络中的光分插复用技术，是实现波分复用网络的关键技术之一。

报道了一种主要用作超高速光纤通信光时分复用（OTDM）系统的新型光源,即10GHz的被动外腔式锁模多量子阱半导体激光器,其具有脉冲宽度为2.9ps,波长调谐范围为1.53～1.57μm（40nm）,输出光波长可精确稳定在1.55μm,锁模光脉冲的重复频率为10GHz,平均输出光功率为1mW及较小的时间抖动性（

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The phytoplankton community structure and potential environmental impact factors in the Guangdong-Hong Kong-Macao Greater Bay Area were investigated in July 2019 and December 2020. 151 and 146 species of phytoplankton were identified in summer and winter, respectively, and the community was dominated by diatoms, followed by dinoflagellates. The average abundance of phytoplankton in summer (13.75 ± 3.98)×104 ind.L-1 was higher than that in winter (3.17 ± 0.30)×104 ind.L-1. The mean values of diversity index and evenness in summer (2.36 ± 0.23) and (0.61 ± 0.06) were lower than those in winter (3.65 ± 0.12) and (0.85 ± 0.02). The dominant species had obvious seasonal succession. The dominant species were Pseudo-nitzschia Pungens, Skeletonema costatum, and Pseudo-nitzschia delicatissima in summer and Melosira sulcata var. sulcata, Naviculas sp., Thalassionema nitzschioides, Nitzschia longissima and Cyclotella spp. in winter, respectively. The results of canonical correspondence analysis, Pearson correlation analysis and cluster analysis showed that temperature was one of the important environmental factors affecting phytoplankton abundance and community structure, and the other main factors included salinity, nutrient and turbidity. The phytoplankton communities in the Greater Bay Area showed obvious regional differences in summer and winter, which was closely related to the comprehensive influence of driving factors such as monsoon, Pearl River runoff and terrigenous emissions. [ABSTRACT FROM AUTHOR]

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