碳纳米管是一种性能优良的场发射冷阴极材料,具有低的阈值电场和高的发射电流密度,在平板显示领域具有广阔的应用前景。本文从Fow ler-Nordhe im s场发射理论出发,阐述了CNT的场发射机制,详细论述了包括CNT的结构、方向性、阵列密度、...碳纳米管是一种性能优良的场发射冷阴极材料,具有低的阈值电场和高的发射电流密度,在平板显示领域具有广阔的应用前景。本文从Fow ler-Nordhe im s场发射理论出发,阐述了CNT的场发射机制,详细论述了包括CNT的结构、方向性、阵列密度、吸附气体、工作环境等诸多因素对其场发射特性的影响。研究表明,垂直取向,长径比高,密度适中,表面洁净的CNT场增强因子较大,场发射性能较好。展开更多
In this article, we introduce and study the concept of n-Gorenstein injective (resp., n-Gorenstein flat) modules as a nontrivial generalization of Gorenstein injective (resp., Gorenstein flat) modules. We invest...In this article, we introduce and study the concept of n-Gorenstein injective (resp., n-Gorenstein flat) modules as a nontrivial generalization of Gorenstein injective (resp., Gorenstein flat) modules. We investigate the properties of these modules in various ways. For example, we show that the class of n-Gorenstein injective (resp., n -Gorenstein flat) modules is closed under direct sums and direct products for n ≥ 2. To this end, we first introduce and study the notions of n-injective modules and n-flat modules.展开更多
文摘碳纳米管是一种性能优良的场发射冷阴极材料,具有低的阈值电场和高的发射电流密度,在平板显示领域具有广阔的应用前景。本文从Fow ler-Nordhe im s场发射理论出发,阐述了CNT的场发射机制,详细论述了包括CNT的结构、方向性、阵列密度、吸附气体、工作环境等诸多因素对其场发射特性的影响。研究表明,垂直取向,长径比高,密度适中,表面洁净的CNT场增强因子较大,场发射性能较好。
基金The NSF(11501451)of Chinathe Fundamental Research Funds(31920150038)for the Central Universities and XBMUYJRC(201406)
文摘In this article, we introduce and study the concept of n-Gorenstein injective (resp., n-Gorenstein flat) modules as a nontrivial generalization of Gorenstein injective (resp., Gorenstein flat) modules. We investigate the properties of these modules in various ways. For example, we show that the class of n-Gorenstein injective (resp., n -Gorenstein flat) modules is closed under direct sums and direct products for n ≥ 2. To this end, we first introduce and study the notions of n-injective modules and n-flat modules.