OU—型Markov过程的单点击中概率与Range

本文着重研究OU-型Markov过程的两个问题:第一,关于单点击中概率的问题,并在此基础上进一步确定OU型Markov过程局部时的存在性条件,这个问题的研究是受Kesten,H的影响,但本文中所用方法与[1]有本质的区别。第二,关于Range方面的问题,本文阐述了几类过程以概率1具有包含区间的Range。 关于OU型Markov过程,Tokuzo,Shiga研究了其常返性的判断准则,Sato,K研究了其平稳分布,Hadjiev,D,I,研究了其初遇问题,本文涉及的单点击中概率,局部时及Range尚没人研究过。     

Detailed study of NBTI characterization in 40-nm CMOS process using comprehensive models

The impact of negative bias temperature instability(NBTI) can be ascribed to three mutually uncorrelated factors, including hole trapping by pre-existing traps(?V_(HT)) in gate insulator, generated traps(?V_(OT)) in bulk insulator, and interface trap generation(?V_(IT)). In this paper, we have experimentally investigated the NBTI characteristic for a 40-nm complementary metal–oxide semiconductor(CMOS) process. The power-law time dependence, temperature activation, and field acceleration have also been explored based on the physical reaction–diffusion model. Moreover, the end-of-life of stressed device dependent on the variation of stress field and temperature have been evaluated. With the consideration of locking effect, the recovery characteristics have been modelled and discussed.     

镍纳米粒子耦合氧空位高效催化转化棕榈酸制备烷烃（英文）

随着能源需求的增加和生态环境的恶化,可再生资源的开发与利用越来越受到人们的重视.其中,生物质能源分布广泛,储量丰富,是化石燃料的理想替代品.然而生物质具有高含氧量、高粘度和低热值等特性,开发高效的加氢脱氧催化剂对生物质资源的开发和利用具有重要的应用价值.近年来,研究者们对生物质(脂肪酸及其衍生物)加氢脱氧催化体系进行了大量研究,发现Ni/CeO₂基催化剂能够有效地催化生物质转化并获得较高的生物油产率,然而CeO₂载体的氧空位含量与Ni纳米颗粒尺寸、催化剂脱氧性能之间的关系仍然不明晰.本文采用水热合成法和沉淀法分别制备了H-CeO₂和P-CeO₂载体(商用CeO₂标记为C-CeO₂),通过浸渍法制备了Ni/H-CeO₂, Ni/P-CeO₂和Ni/C-CeO₂催化剂,同时采用无氧空位的SiO₂做载体制备了Ni/SiO₂催化剂,研究了CeO_2...