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In this study, we used a simple impregnation method to prepare Fe–Ce–O x catalysts and tested them regarding their low-temperature (200–300 °C) selective catalytic reduction (SCR) of NO using NH3. We investigated the effects of Fe/Ce molar ratio, the gas hourly space velocity (GHSV), the stability and SO2/H2O resistance of the catalysts. The results showed that the FeCe(1:6)O x (Ce/Fe molar ratio is 1:6) catalyst, which has some ordered parallel channels, exhibited good SCR performance. The FeCe(1:6)O x catalyst had the highest NO conversion with an activity of 94–99% at temperatures between 200 and 300 °C at a space velocity of 28,800 h?1. The NO conversion for the FeCe(1:6)O x catalyst also reached 80–98% between 200 and 300 °C at a space velocity of 204,000 h?1. In addition, the FeCe(1:6)O x catalyst demonstrated good stability in a 10-h SCR reaction at 200–300 °C. Even in the presence of SO2 and H2O, the FeCe(1:6)O x catalyst exhibited good SCR performance. 相似文献
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Alloying is an effective way to manipulate the composition and physico-chemical properties of functional materials. We demonstrated the syntheses of alloyed Co x Ni1?x O nanocrystals using a nonaqueous approach, with x continuously tuned from 0 to 1 by varying the molar ratios of the cobalt precursor in the reagents. The morphological, structural, and compositional properties of the alloyed Co x Ni1?x O nanocrystals were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), and energy dispersive X-ray spectroscopy (EDS). The results showed that the cobalt and nickel atoms were homogeneously distributed in the alloyed nanocrystals. The as-prepared Co x Ni1?x O nanocrystals can be applied as the hole-transporting layers in polymer light emitting diodes (PLEDs). Our study provides a good example for the syntheses of alloyed oxide nanocrystals with continuously tunable composition. 相似文献
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For linear switched system with both parameter uncertainties and time delay, a delay-dependent sufficient condition for the
existence of a new robustH
∞ feedback controller was formulated in nonlinear matrix inequalities solvable by an LMI-based iterative algorithm. Compared
with the conventional state-feedback controller, the proposed controller can achieve better robust control performance since
the delayed state is utilized as additional feedback information and the parameters of the proposed controllers are changed
synchronously with the dynamical characteristic of the system. This design method was also extended to the case where only
delayed state is available for the controller. The example of balancing an inverted pendulum on a cart demonstrates the effectiveness
and applicability of the proposed design methods.
Project (No. 2002CB312200) supported by the National Basic Research Program (973) of China 相似文献
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本文认为收入高中《语文》和中师《阅读与写作》等教材中的古文《阿房；宫赋》的一些注释，对作者丰富巧妙的文意有曲解和遗漏，并予以摘出。在作者看来，无论是欣赏坏是教学，应从根本上，从丰富的意图上探求明了，才利于理解。 相似文献
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张祝平 《南通师范学院学报》2000,16(1):28-31
《诗经》中甲诗的某些诗句，句型与乙诗中的某些诗句、句型相同相近，因而构成了两诗之间的血缘联系，我们称之为“《诗》血缘句”通过对它的研究，对《诗》的创作形成，成诗的时间、诗的作者、流传、传授过程、分类，诗与音乐的关系，《诗经》时代人们的对诗歌的理解，诗的创作手法、诗的注疏等一系列问题会有新的突破。 相似文献
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文学经典作品普遍存在着预言现象。本文以中西文学经典之作《红楼梦》和《百年孤独》为例案,运用共同性比较手法,研究文学预言造成的结构机制、。文化艺术原因,从而揭示经典之作中文学预言现象之谜。 相似文献
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由于观念与认识的不同，对《诗经》中的作品《葛屦》出现一些不一致的看法本文试通过对“葛屦”、“可”、“裳”、“要、”等词、句的分析和研究，对《葛屦》的主旨作出一个新的解释和判断。 相似文献
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邹然 《江西师范大学学报(哲学社会科学版)》2000,33(1):41-47
《诗经》批评发展至晋南北朝时期,逐渐呈现出不同以往的新趋势,批评者文学鉴赏和艺术审美的自觉得到加强,涉及内容更为广泛,探讨角度更为开阔,出现了摘句激赏,文体比较,手法甄别,源流探索等新的批评现象,形成一才名范畴和命题,这在《诗经》文化史上具有较大意义,开辟了从文学角度研讨“三百篇”的新途径。 相似文献
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本文从人物形象、故事情节、结构等几方面论述了《水浒传》的道教思想和对待道教的态度，得出作品对待道教尊重、敬仰甚至虔诚的结构。 相似文献
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宝音巴图 《内蒙古师范大学学报(哲学社会科学版)》2000,29(1):33-38
萨满教“万物有灵论”是蒙古族史诗《江格尔》基本故事情节及主要人物形象之英雄主义精神和生死观的生命线,萨满教“三界说”在《江格尔》里体现了“神本文化”,而萨满教的控驭行为（巫术）则反映了《江格尔》从“神本文化”向“人本文化”过渡的状态。在此基础上,作者提出史诗《江格尔》的基本故事情节的产生是在原始社会末期,奴隶社会初期。 相似文献
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