基于低帧频CCD的快速反射镜系统控制(英文)

低频采样和延迟对光电成像跟踪系统会带来严重的相位滞后,极大地限制了系统闭环带宽和跟踪精度的提高.零极点对消法虽可以抑制对象谐振而扩大系统带宽,但必须依赖精确的数学模型和较高的采样频率.分析了复数零点PID控制器在低频采样的FSM控制系统中的应用,可以获得较好的闭环性能而且可以避免零极点对消法无法单独应用于低频采样的跟踪系统的问题.采用200 Hz帧频的CCD对此方法进行了实验验证,实验结果证明满足设计要求.     

Synthesis of mesoporous polymeric carbon nitride exhibiting enhanced and durable visible light photocatalytic performance

A thiourea precursor was employed to synthesize mesoporous carbon nitride(C3 N4) by a thermal polycondensation process with high surface area SiO2 and nanosphere SiO2 as two types of hard templates. The resultant mesoporous C3 N4 samples have high surface areas(105–112 m2/g) and mesopores with narrow sizes distribution(9.3 nm). Photocatalytic performance was evaluated by removal of NO in air under visible light irradiation. The results showed that mesoporous C3 N4 samples exhibited significantly improved photocatalytic activity in comparison with bulk C3 N4, which also exceeded that of N-doped TiO2 and C-doped TiO2. The activity enhancement can be ascribed to the synergistic effects of large surface area and pore volume, enhanced light-harvesting ability, increased redox potential, and reduced recombination of charge carriers. In addition to the high activity, the mesoporous C3 N4 samples also showed high photochemical stability. The mesoporous C3 N4 photocatalysts with enhanced and durable activity could provide a new efficient material for environmental pollution control.     

Theoretical advances of the structures and catalytic activities of small-sized gold nanoclusters

Gold nanoclusters exhibit extraordinary catalytic activities,but the dominating factor is still unclear due to the complexity of the structures.In this review,we briefly summarized the recent theoretical progress on their structures and catalytic activities.Combining the experimental and theoretical efforts,the structures of small-sized gold clusters have been explored systematically.Based on the determined structures,factors that influence the catalytic capabilities of small-sized gold clusters(Au_(16)-Au_(35))are studied using CO oxidation asa probe.The preadsorption energies of CO and O_2are found strongly correlated with catalytic activities,which could be affected by the clusters'geometries,sizes,and charge distributions.In addition,the presence of water could significantly lower the activation energy barrier of O_2 dissociation to enhance the clusters'catalytic activities.     

论韩愈对辛弃疾创作的影响

辛弃疾在南宋文坛上占有崇高的地位,其文学成就的取得,与其转益多师、善于学习前人密切相关。其中,韩愈的影响不容忽视。迄今为止,尚少有人就此问题予以深入、全面的考察。韩愈作品为辛弃疾大量引用,韩愈的"气盛言宜""不平则鸣""以文为戏"等文学观对辛氏影响甚强,韩愈"以文为诗"、奇崛险怪的诗歌艺术对辛氏创作的影响也很大。韩愈对辛弃疾创作的影响,具有多方面的意义。一方面可使我们看到二人审美趣尚的共通之处,另一方面还有助于我们探索辛氏仰慕韩愈的原因及辛氏文学观和创作风格的渊源,此外,由这一影响,也可见出辛氏词艺与韩诗的密切关系。     

一种荧光灯电子镇流器电路分析

本文分析了一种性能优良的荧光灯电子镇流器的电路结构，工作原理及其使用时的特点。     

广义Lupas-Baskakov积分算子关于一类函数的逼近

讨论广义Lupas-Baskakov积分算子在比有界变差函数更广的一类函数Br（υ）上的逼近,得到了其同时逼近的估计.     

吴澄心性论对韩国的影响

中国理学自朱熹到阳明的发展过程中的中间环节，是以吴澄为代表的。吴澄既崇尚朱子学，又兼综陆学，具有心学因素。13世纪，心性论传入韩国，极大地影响了李朝性理学的发展路线。     

当代中国草根文化研究综述

当今各种草根文化现象大范围出现,而在理论界也逐渐展开了对草根文化的研究。对现实文化现象的关注是人文学科的应有之义,也是美学发展的新方向。我国当前这种盛行的"草根文化"现象应该得到学术界的关注和学理上的探讨。在此,笔者对目前的草根文化研究状况进行了梳理,肯定了研究的成果,并且指出了不足之处,以期引起更深刻、更广泛的研究。     

赋是汉代文学宏大叙事的典型样本——以汉大赋为中心

汉赋中表现出鲜明的国家一天下意识、浓重的历史情绪和高昂的政治热情，呼应着时代的共同主题，成为汉代社会精神的集中表现，是汉代文学宏大叙事的典型样本。     

从语言学理论视角看“开发内化”教学模式

“开发内化”教学模式注重学生自主学习能力和独立应用能力的培养。从语言学理论来看，该教学模式符合语言认知规律，但如何运用有效举措来刺激学生认知能力的科学有序发展，则是语言教学中正确运用“开发内化”教学模式的关键所在。