新型光纤光栅扭转传感器研究

报道了一种新型光纤光栅扭转传感器的基本原理和传感结构,推导了扭转测量的理论公式,该传感器的扭角与光纤光栅中心波长的变化呈线性关系.在±40°扭角范围内,技术上实现了灵敏度为10.715°/nm的扭转传感.     

Binuclear cyanide-bridged cobalt–iron complexes

Three new binuclear complexes: [(NO)(CN)₄FeCN–Co(en)₂] · H₂O (1), [(NO)(CN)₄FeCN–Co(pn)₂] · 2H₂O (2), and [(NO)(CN)₄FeCN–Co(tn)₂] · 3H₂O (3) (en = ethylenediamine, pn = 1,2-diaminopropane; tn = 1,3-diaminopropane) have been prepared and their properties studies by i.r., u.v. spectroscopy, cyclic voltammetry, and by magnetic measurements.     

利用冷却法得到多波长输出的光纤环形激光器

提出一种新型的掺铒光纤环形激光器,利用全光纤马赫－曾德尔干涉仪选频,并将掺铒光纤浸在液氮中冷却,得到了稳定的７个波长的激光输出,波长间隔为０．６５ｎｍ。     

柱体形状对气液两相涡街的影响

本文试验研究了柱体形状对气液两相涡街的影响，得出了在气液两相流中的最佳涡街发生体和发生两相涡街时，两相斯托拉赫数，来流截面含气率，水流量三者之间的关系。试验工质为水和空气，混合物流动方向垂直向上。参数范围：相对压强０．０－０．２ＭＰａ；来流截面含气率０．０－０．３５；水流量０．０－２６ｍ３／ｈ。     

Approximation methods for complex polynomial optimization

Complex polynomial optimization problems arise from real-life applications including radar code design, MIMO beamforming, and quantum mechanics. In this paper, we study complex polynomial optimization models where the objective function takes one of the following three forms: (1) multilinear; (2) homogeneous polynomial; (3) symmetric conjugate form. On the constraint side, the decision variables belong to one of the following three sets: (1) the \(m\) -th roots of complex unity; (2) the complex unity; (3) the Euclidean sphere. We first discuss the multilinear objective function. Polynomial-time approximation algorithms are proposed for such problems with assured worst-case performance ratios, which depend only on the dimensions of the model. Then we introduce complex homogenous polynomial functions and establish key linkages between complex multilinear forms and the complex polynomial functions. Approximation algorithms for the above-mentioned complex polynomial optimization models with worst-case performance ratios are presented. Numerical results are reported to illustrate the effectiveness of the proposed approximation algorithms.     

全光纤调Q激光器的实验研究

介绍了一种采用马赫－曾特尔干涉仪结构实现调Ｑ的光纤激光器．其中,马赫－曾特尔干涉仪由两个３ｄＢ耦合器和两段光纤（作为干涉仪的双臂）构成．在泵浦功率为３０ｍＷ时,得到了稳定的激光输出,最高脉冲功率达２．６Ｗ,平均功率为１ｍＷ．当重复频率低于１ｋＨｚ时,在１５５７ｎｍ波长处得到光脉冲,半宽为４．２μｓ．此外,在调Ｑ脉冲包络内观察到了自锁模现象．     

等效电路计算同轴输出腔TM310模式的间隙阻抗

设计了外Q值较小,工作于高阶横磁TM310模的X波段速调管单间隙同轴输出谐振腔。用微波等效电路理论计算了高阶横磁TM310模情形六个漂移管的等效间隙中心位置,由此计算腔内等效间隙中心到输出波导内横向膜片的等效长度。以MATLAB编程计算得到同轴谐振腔TM310模式加载矩形波导滤波器输出回路的间隙阻抗,其结果与传统冷测模拟法计算结果吻合。验证了等效长度计算方法的正确性,用于圆柱腔基模的传统微波等效电路理论能用于分析同轴谐振腔高阶横磁模式输出回路,且比传统的冷测模拟法及场分析法更为快捷。     

聚氯乙烯增塑糊流变行为研究——Ⅲ、稀释剂和分散剂的影响

以石油溶剂为稀释剂,4-甲基-2-戊酮(Ⅰ)和2-乙氧基乙醇(Ⅱ)为分散剂,研究了不同PVC树脂增塑糊的粘度特征。结果表明,由于PVC是极性聚合物,分散剂的分散效果主要决定于它的极性,Ⅰ的分散效果优于Ⅱ。若PVC含有聚氧乙烯基型表面活性剂,其糊用PVC树脂颗粒能较好地分散。     

Electric Voltage Tuning of an All-fiber Mach-Zehnder Interferometer

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