基于组合赋权法和云重心评估法的燃气轮机健康状态评估

鉴于表征燃气轮机健康状态的信息具有模糊性和随机性的特点,提出了一种基于组合赋权法和云重心评估法相结合的健康状态评估方法。方法首先运用层次分析法和熵权法分别计算燃气轮机评估指标的权重值,再通过组合赋权法,得到具有主客观意义的权重;在此基础上,引入云重心评估法对燃气轮机进行评估;并采用加权偏离度衡量系统状态变化的程度,从而确定燃气轮机健康状态等级。以某型真实燃气轮机为例,对其进行了试验验证。验证结果表明,提出的基于组合赋权法和云重心评估法的健康状态评估方法能有效对燃气轮机进行评估;并能够弱化燃气轮机健康状态监测信息的随机性和模糊性。     

高速公路拓宽新路基差异沉降计算分析

高速公路拓宽过程中,由于新老路基固结程度不同,路面荷载作用下新填路基会产生较大沉降,导致路面破坏;甚至会引发交通事故。基于土的孔隙介质特性,考虑路基边坡对路基沉降的影响,采用修正的分层总和法和ABAQUS数值模拟来计算新填路基路面沉降规律。计算结果表明修正的计算方法得出的路面沉降曲线与实际现场观测结果有明显的相似性,能够比较准确地反映路面不同位置的变形规律,可用于软土路基沉降计算及预测预报,为路基工程设计施工提供参考。     

基于实测沉降比的群桩沉降分析

由于单桩试桩曲线包含了丰富的桩土相互作用信息,在一定程度上直接反应了现场土质的力学性态,所以提出利用单桩静载试验来推求群桩沉降.考虑到目前桩基理论计算出来的相互作用系数夸大了群桩间的相互作用,因此收集了77组单群桩沉降实测资料,利用其中71组进行统计分析,得到了群桩沉降比公式,对其余6组进行实例分析,结果表明该方法合理,具有较强的适用性.     

一类E33系统的Hopf分支和原点为中心时的全局结构

目的研究了一类E33系统的定性性质。方法运用定性理论和平面系统的分支理论。结果给出了原点O(0,0)为全局中心时的所有可能的全局结构和产生Hopf分支的充分条件。结论得到了关于此类三次系统的比较完整的结果。     

何谓“欧洲”？——读《彩色欧洲史》

约翰·史蒂文森博士总编的《彩色欧洲史》叙述了从爱琴海文明到本世纪初的欧洲历史,再现了欧洲整体的发展全貌,摈除了“欧洲中心论”的传统影响,客观评价了欧洲在世界历史中的地位,尽量还原了真实的欧洲历史图景。不失为一套欧洲史的佳作。     

Site-directed mutagenesis reveals new and essential elements for iron-coordination of the sulfur oxygenase reductase from the acidothermophilic Acidianus tengchongensis

Previous study on refolding of sulfur oxygenase reductase (SOR) inclusion bodies from recombinant Escherichia coli showed that iron was critical to the activity of the SOR from Acidianus ambivalens. In this study, enzymatic assays showed that 2,2′-Dipyridyl, Tiron and 8-hydroxyquinoline, which are specific for chelating ferrous or ferric ions, strongly inhibited the activity of SOR from A. tengchongensis, suggesting that iron atom is essential for SOR activity. Alignment of several functionally identified SORs and SOR-like sequences from genome database revealed a conserved, putative iron binding motif, H⁸⁶-X₃-H⁹⁰-X _n -E¹¹⁴-X _n -E¹²⁹ (numbering according to the Acidianus tengchongensis SOR sequence). Three mutants of SOR were generated by site-directed mutagenesis of H₈₆, H₉₀ and E₁₂₉ into phenylalanine or alanine residue in this study. Circular dichroism spectrum determination indicated that there was no change of the secondary structures of mutant SORs, H⁸⁶F, H⁹⁰F and E¹²⁹A, but all mutants were completely inactive. Through determination of iron contents we found that SOR mutants of H⁸⁶F, H⁹⁰F and E¹²⁹A completely or partially lost iron, while mutants of C³¹S, C¹⁰¹S, and C¹⁰⁴S (generated in a previous study) did not. This result indicated that H⁸⁶, H⁹⁰ and E¹²⁹ but not C³¹, C¹⁰¹, and C¹⁰⁴ were involved in binding to iron atom. Based on this and previous studies, it is proposed that the conserved motifs, C³¹-X _n -C¹⁰¹-X₂-C¹⁰⁴ and H⁸⁶-X₃-H⁹⁰-X₂₃-E¹¹⁴-X₁₄-(E/D)¹²⁹, are respectively for sulfur and molecular oxygen binding and activation. These two conserved motifs are essential elements for the SOR activity. Supported by National Natural Science Foundation of China (Grant Nos. 30670018, 30621005) and State Key Basic Research and Development Program of China (Grant No. 2004CB719602)     

New BaBrCl： Eu^2＋ phosphors for X-ray image recording

Photostimulated luminescence （PSL） is observed in BaBrCl： Eu^2＋after X-ray irradiation at room temperature. It is suggested by PSL stimulation spectrum and difference absorption spectrum （DAS） that F centers are formed upon X-ray irradiation and both spectra show two bands which are centered at about 550 nm and 675 nm respectively. This enables the use of semiconductor light-emitting diodes （LED） instead of gas lasers for photostimulation. The PSL intensity increases linearly with X-ray irradiation dose increasing, and the conversion efficiency is 29% that for the standard commercial storage phosphor BaFBr：Eu from Fuji imaging plate.     

一类无限维李代数的同构与同态

本文探讨一类的无限维李代数,并构造了此类李代数的理想,同构,同态,并对其性质作了探讨.     

群桩竖向荷载-沉降特性影响因素的数值分析

在采用三维数值模拟法对一群桩试验模型进行分析对比基础上,建立了与实际工程中相近的低承台群桩模型,用数值模拟手段揭示了在上部荷载作用下群桩的荷载-沉降特性,并对群桩基础荷载-沉降曲线的影响因素分别进行了分析与探讨.结果表明:桩长(长细比)、桩距(距径比)、桩土剪切弹簧刚度、桩端土刚度、承台刚度及其设置方式对群桩荷载-沉降曲线影响较大,而桩身刚度的影响不明显.     

一种集聚中心的核估计法

从样本点的核密度估计出发,对集聚型点模式的集聚中心的个数和位置的确定方法进行了探索,提出一种集聚中心的核估计算法.与原有的基于几何概率提取集聚中心的方法相比,该算法对只有一个集聚中心的情况以及任意维数的样本空间点具有更好的估计效果.