基于主观感觉理论的LED图像显示质量的简易测定评估方法

研究了LED视频显示大屏幕的测定和评估方法，实验表明，对LED视频图像显示质量的评估应从主客观两方面进行，才能对屏幕的主要技术参数做出有效的测定评估，本文从生理物理学的角度提出了一种简易的屏幕亮度及全屏显示质量测定及评估理论，经过实验检验，此理论基本解决了LED视频显示屏测定及评估方面的诸多问题。     

马协细胞质雄性不育水稻线粒体能量释放特征

测定了马协细胞质雄性不育系及其保持系水稻线粒体能量释放热谱和DSC曲线,探讨了它们在恒温和变温条件下能量释放规律和特性.结果表明马协细胞质雄性不育水稻线粒体在其能量释放过程中放热量较大,能垒较高且机制较为复杂,故其能量释放速率则较其可育系小.     

UPLC‐ESI/MS determination of 17 active constituents in two categorized formulas of traditional Chinese medicine,Sanhuang Xiexin Tang and Fuzi Xiexin Tang: application in comparing the differences in decoctions and macerations

A rapid and sensitive UPLC‐ESI/MS method was established and validated to determine 17 active constituents (aconitine, hypaconitine, mesaconitine, benzoylaconine, benzoylhypaconine, benzoylmesaconine, berberine, palmatine, jatrorrhizine, coptisine, baicalein, wogonin, baicalin, wogonoside, emodin, aloe‐emodin and rhein) in Sanhuang Xiexin Tang (SXT) and Fuzi Xiexin Tang (FXT), which are two classic compound recipes from Xiexin Tang categorized formulas in traditional Chinese medicien. The separation was performed on a UPLC BEH C₁₈ column gradient eluted using acetonitrile and 0.1% formic acid as mobile phase. ESI/MS was operated in positive ([M + H]⁺) in selected ion recording mode for analysis of alkaloids and flavones, while in negative ([M ? H]^?) selected ion recording mode for anthraquinones. All of the 17 constituents exhibited good linearity in a relatively wide concentration ranges with the lowest limits of detection of 0.38 ng/mL. All of the relative standard deviation values of intra‐ and inter‐precisions and stabilities of 17 constituents were within 5%. The method was successfully applied to determine 17 active constituents in decoctions and macerations of SXT and FXT. The results indicated that different preparative methods resulted in significant diversity in concentrations of the 17 analytes. Herb–herb interaction appeared between aconitum alkaloids in Aconiti Lateralis Radix Preparata and another three herbs. Copyright © 2013 John Wiley & Sons, Ltd.     

Fe—Al配位催化环氧丙烷均聚

用于环氧丙烷开环聚合的催化剂为有机金属化合物和稀土络合物等,在对于铁系催化剂催化丁二烯聚合、马来酸酐与苯乙烯共聚和邻苯二甲酸酐与环氧丙烷共聚的研究基础上,我们首次将这一类催化剂用于环氧化物的开环均聚上,发现Fe(acac)3-Al(i-Bu）3催化剂具有良好的催化活性,并进行了产物结构和反应动力学的研究,结构分析表明Fe(acac)3-Al(i-Bu）3催化剂体系具有良好的立体定向性。     

缓蚀剂对船用钢在潮湿大气中的防蚀研究

模拟 90 7A钢在海水的潮湿大气环境和表面覆有薄层缓蚀剂液膜状态下其腐蚀受抑制的情况 ,利用恒电量仪连接ACM控头 ,监测其腐蚀状态 ,结合电化学阻抗谱 (EIS)的测量 ,探讨 90 7A钢在薄层缓蚀剂液膜下的腐蚀受到抑制机理 .结果表明 :此时大气腐蚀反应已转变为阳极过程控制占优势 ,在浸润后期的EIS呈现出由腐蚀介质扩散和电化学放电混合控制特征 ,如果利用恒电量激励下的等效电路模型解析 ,则可以更清楚地获知薄层缓蚀剂液膜下金属表面膜层的信息     

故障树计算的一种新方法

本文提出的顶事件发生概率的算法不借助割集，直接采用自顶向下的技术对故障树进行分割求解。该算法的时间和内存耗用与故障树的节点数目没有必然联系，而仅仅取决于故障树中不同的重复事件的个数。     

Modified cyanate ester resins with lower dielectric loss,improved thermal stability,and flame retardancy

Novel modified cyanate ester (CE) resins with decreased dielectric loss, improved thermal stability, and flame retardancy were developed by copolymerizing CE with hyperbranched phenyl polysiloxane (HBPPSi). HBPPSi was synthesized through the hydrolysis of phenyltrimethoxysilane, and its structure was characterized by ¹H‐NMR, ²⁹Si‐NMR, and Fourier transform infrared spectra. The effect of the incorporation of HBPPSi into CE resin on the curing behavior, chemical structure of cured networks, and typical performance of HBPPSi/CE resins were systemically evaluated. It is found that the incorporation of HBPPSi into CE network obviously not only catalyzes the curing of CE, but also changes the chemical structure of resultant networks, and thus results in significantly decreased dielectric loss, improved thermal stability, and flame retardancy as well as water absorption resistance. For example, in the case of the modified CE resin with 10 wt% HBPPSi, its limited oxygen index is about 36.0, about 1.3 times of that of neat CE resin, its char yield at 800°C increases from 31.6 to 35.4 wt%; in addition, its dielectric loss is only about 61% of that of neat CE resin at 1 kHz. All these changes of properties are discussed from the view of the structure–property relationship. The significantly improved integrated properties of CE resin provide a great potential to be used as structural and functional materials for many cutting‐edges fields. Copyright © 2011 John Wiley & Sons, Ltd.     

CSR电子冷却系统电子束空间电荷效应对电子束温度的影响

 通过求解电子冷却系统中冷却段漂移管区的强流电子束产生的空间电荷场,研究了电子束空间电荷效应对电子温升的影响。结合HIRFL CSR电子冷却系统的典型参数,得到了电子在自身空间电荷场和纵向螺线管磁场组成的交叉场作用下产生的漂移速度和由此引起的附加温度大小,并指出减小电子束空间电荷效应的方法。     

HIRFL-CSR电子冷却系统空心电子束性能研究

 电子冷却系统中冷却力的大小与电子束的温度密切相关。由于强流电子束自身产生的空间电荷场,使得电子束的速度离散,增加了电子束温度,降低了冷却效率。为了减小空间电荷效应,HIRFL CSR的电子冷却系统将首次采用空心电子束对储存环中的重离子束流进行冷却。通过分析实心电子束和空心电子束的空间电荷场,研究了其对电子束速度和温度的影响。     

考虑螺旋带径向厚度的螺旋线慢波系统的研究

 分析了具有夹持杆和金属屏蔽筒并且考虑了螺旋带径向厚度的螺旋线慢波系统的色散特性和耦合阻抗。通过用切比雪夫多项式来展开螺旋带上的面电流，用真空层来模拟螺旋带的厚度，用均匀分层介质来等效介质夹持杆，得到了色散方程和耦合阻抗的表达式。与实验数据相比，考虑螺旋带厚度所得出的结果明显优于未考虑其厚度的结果。利用该模型设计了两个工作在3GHz的螺旋线慢波系统。