阻容耦合放大器的频率响应

放大器的放大倍数和输入交流信号频率的关系,称为放大器的频率特性。或称频率响应,本文从输入交流信号的三个相对频段即高频、中频和低频来分析阻容耦合放大器的不同频率响应。     

含耦合电感电路的网孔分析法初探

将网孔分析法用于含耦合电感电路,其结果和通常所用的网孔分析法相同,且较为简便.     

The effects of upper‐secondary education and training systems on skills inequality. A quasi‐cohort analysis using PISA 2000 and the OECD survey of adult skills

Research tells us much about the effects of primary and lower‐secondary schooling on skills inequality, but we know less about the impact of the next stage of education. This article uses a differences‐in‐differences analysis of data on literacy and numeracy skills in PISA 2000 and SAS 2011/12 to assess the contribution of upper‐secondary education and training to inequalities in skills opportunities and outcomes. It finds that greater parity of esteem between academic and vocational tracks, as found in German‐speaking and Scandinavian countries, has some positive effects in mitigating skills inequality. However, the most important factors seem to be high completion rates from long‐cycle upper‐secondary education and training and mandatory provision of Maths and the national language in the curriculum.     

FKKM定理和Ky Fan极小极大不等式在H-空间中的推广及其关于极大元的应用

本文通过放弃凸性和放松γ-对角拟凹性等条件,在H-空间中推广了Fan-Knaster-Kuratowski-Mazurkiewicz(FKKM)定理和Ky Fan极小极大不等式,然后应用这些结果在很弱的假定下证明了二元关系的极大元的存在性,本文结果推广了许多文献中相应的结果.     

范条件图的上可嵌入性

关于图的上可嵌入性，刘彦佩和Nebseky分别给出不同形式的充要条件，黄元秋从另一相反角度出发，提供了一个关于不是上可嵌入图的充要条件，章利用关于不是上可嵌入图的充要条件，证明了范条件图是上可嵌入的。     

有限非空论域上串行的二元关系与近似算子的特征联系

本文推理，总结出了有限非空论域上特殊的二元关系与近似算子特征的联系，以便利用近似算子来讨论与二元关系相关的问题。     

基于多孔介质湿热迁移的混凝土收缩数值模拟

为了对处于环境温、湿度中的混凝土的收缩变形进行有效数值模拟分析,提出了一种数值解析与有限元分析相结合的方法.根据多孔介质热质传输原理描述混凝土中湿热迁移过程的耦合偏微分方程组,借助Laplace变换及传递函数将其简化为拉氏域内的简单微分方程并求解,然后通过Laplace逆变换得到物理空间内的温度和含湿量.在此基础上利用有限元分析方法得到混凝土湿热耦合收缩变形.该方法克服了其他求解过程中特征值复杂、耦合困难及准确性差的问题,并有效解决了现有有限元软件难以处理湿度应力及变形的难题.以Hundt试验为算例的数值计算表明,模拟结果与试验数据具有良好的相关性.     

儿童胃镜检查48例临床分析

总结分析我院自2002年11月至2005年6月对48例10—14岁儿童上消化系统疾病进行纤维胃镜检查的资料。结果表明:儿童上消化系统疾病以慢性浅表性胃炎和十二指肠球部溃疡最常见,对有疑诊者应早期作胃镜检查,及时治疗。     

Probing of coupling effect induced plasmonic charge accumulation for water oxidation

A key issue for redox reactions in plasmon-induced photocatalysis, particularly for water oxidation, is the concentration of surface-accumulating charges (electrons or holes) at a reaction site for artificial photosynthesis. However, where plasmonic charge accumulated at a catalyst''s surface, and how to improve local charge density at active sites, remains unknown because it is difficult to identify the exact spatial location and local density of the plasmon-induced charge, particularly with regard to holes. Herein, we show that at the single particle level, plasmon-coupling-induced holes can be greatly accumulated at the plasmonic Au nanoparticle dimer/TiO₂ interface in the nanogap region, as directly evidenced by the locally enhanced surface photovoltage. Such an accumulation of plasmonic holes can significantly accelerate the water oxidation reaction (multi-holes involved) at the interfacial reaction site, with nearly one order of magnitude enhancement in photocatalytic activities compared to those of highly dispersed Au nanoparticles on TiO₂. Combining Kelvin probe force microscopy and theoretical simulation, we further clarified that the local accumulated hole density is proportional to the square of the local near-field enhancement. Our findings advance the understanding of how charges spatially distribute in plasmonic systems and the specific role that local charge density at reaction sites plays in plasmonic photocatalysis.