PR PLAST.S改性沥青混合料性能试验研究

首先采用Superpave体积设计法设计了Sup-20沥青混合料；其次，选用法国PR PLAST．S抗车辙剂和国产车辙王抗车辙剂，采用4h改进车辙试验和SPT试验比较了两种改性沥青混合料高温性能的差异。通过马歇尔冻融劈裂试验、四点弯曲小梁试验和约束试件温度应力试验评价抗车辙剂PR PLAST．S对沥青混合料水稳定性能、抗疲劳性能和低温抗裂性能的影响。为PR PLAST．S抗车辙剂在我国的推广应用提供了理论基础，也为实体工程比选抗车辙剂提供了试验方法参考。     

质子交换LiNbO3光波导偏振器的研究

采用平板漏波导模型，对质子交换ＬｉＮｂＯ３波导中的寻常光传输损耗特性进行了理论分析。在此基础上，首次研制了１．５μｍ质子交换ＬｉＮｂＯ３光波导偏振器，其消光比和带尾纤插入损耗分别为４２ｄＢ和４．３ｄＢ。     

联合法用于深冷净化精馏塔的模拟计算

采用三对角矩阵-Broyden联合法对深冷净化精馏塔进行模拟计算,得到了温度、压力、汽液相流率和组成沿全塔的分布数据,计算结果表明：与文献设计值符合很好．     

Photorefractive Effect in an Azobenzene Chromophore Side Groups Polymer

We have analyzed the photorefractive(PR) effect of a polymer composite was reported which combines a novel bi-functional poly(N-vinyl)-3-[p-nitrophenylazo]carbazolyl(PVNPAK) and 2,4,7-trinitro-9-fluorenone(TNF). PVNPAK was synthesized by a post-azo-coupling reaction, with an azo derivative as the electrooptic chromophore and carbazolyl as photoconductive moiety. The asymmetric two-beam coupling gain of 13.9 cm-1 and diffraction efficiency of 1.2% for poled polymer film fabricated using a corona poling are obtained at the wavelength of 647.1 nm, confirming photorefractivity. We interpreted this result as the orientational enhancement, in which the spatial charge field may enhance the modulated orientation of the azobenzen chromophore. It is unexpected that the photorefractive gain of 9.5 cm-1 for the unpoled polymer film also was observed without external field in two-beam coupling(TBC) experiment. This phenomenon is attributed to a light-induced orientational grating when the azobenzene groups are illuminated by polarized light.     

基于ITD与排列熵的石油井架损伤识别方法

针对石油井架损伤位置识别问题,提出了基于ITD与排列熵的损伤位置特征提取方法。利用ITD方法将锤击响应振动信号分解为一系列PR分量,PR分量更能突出损伤位置信息,计算PR分量的样本熵值,形成的特征向量可分性良好。依据相关性系数选择代表损伤状态主要信息的PR分量,计算其排列熵形成有效的特征向量。以支持向量机为特征向量模式识别器,对比了ITD与近似熵方法所提取特征向量,对于相同有限数量的样本,ITD与样本熵特征向量明显高于ITD与信息熵特征向量的识别率,验证了ITD样本熵方法的有效性。ITD样本熵方法为实际井架结构损伤的准确、快速、有效识别与定位提供了一种新途径。     

PR改性沥青混合料设计及施工质量控制探讨

结合忻阜高速公路工程施工实践,介绍了PR改性沥青混合料的原材料要求和配合比设计,并对PR改性沥青混合料的拌合、运输、摊铺、碾压等施工工艺作了具体阐述,指出PR改性沥青混合料能有效降低沥青路面车辙病害,值得推广。     

PR.M高模量沥青混合料性能试验研究

采用PR.M制备了高模量沥青混合料,并与添加聚酯纤雏的沥青混合料作对比分析。通过一系列室内试验,较为全面地分析了高模量沥青混合料的综合路用性能。结果表明,PR.M添加剂不仅可以大幅度提高沥青混合料的动态模量,改善其高温性能,也能够明显提高其抗水损害性能和低温抗裂性能,但抗疲劳性能有所下降。本研究成果可为PR.M高模量沥青混合在国内的推广应用提供参考依据。     

SCR of NOx by NH3 over MnFeOx@TiO2 catalyst with a core-shell structure: The improved K resistance

Some fly ash components such as K could seriously weaken the catalytic performance of SCR catalyst. In this study, the core-shell-structured [email protected]₂ catalyst is synthesized by dipping deposition method and used for the NH₃-SCR reaction. The results show that [email protected]₂ catalyst exhibits higher K resistance than MnFeOx/TiO₂ catalyst prepared by impregnation method. And the correlativity between the core-shell morphology and K resistance of [email protected]₂ catalyst is studied by TEM, N₂ adsorption, XRD, XPS, TPR, TPD and in situ DRIFT. It can be found that the shell of TiO₂ has a protective effect on the active species in [email protected]₂ catalyst. And the core-shell structure of [email protected]₂ catalyst can produce more Mn⁴⁺ and chemisorbed oxygen species on its surface, improving reducibility and surface acidity. Moreover, the core-shell structure of [email protected]₂ catalyst is beneficial to the adsorption of NH₃ and the formation of NO₂, resulting in the favored SCR reaction via the Eley?Rideal and the Langmuir?Hinshelwood routes. Therefore, [email protected]₂ catalyst shows excellent K tolerance.     

基于滚动投切型SVC的智能控制器的研究

简要分析了SVC的系统结构及其各部分的工作原理与特性,将电容投切过程分为暂态与稳态过程,并以此结合机械投切开关(MS)、晶闸管投切开关(TS)的特性,使得滚动投切无功补偿装置达到最优状态。在此基础上分析了TCR的工作原理,结合滚动投切开关中MS模块以及TS模块,提出了一种针对该种SVC的控制方法。该方法结合了比例积分控制PI以及比例谐振PR控制,在TCR控制端加入比例谐振PR控制,控制TCR触发角。最后,对此方法进行了仿真,与传统控制方式相比,该控制器在提高功率因数、抑制谐波以及提高系统稳定等方面进行了改进。