【摘 要】
：
This paper reports that an atomic scale study of [(-1)10] symmetrical tilt grain boundary (STGB) has been made with modified analytical embedded atom method (MA
【机 构】
：
College of Physics and Information Technology, Shannxi Normal University, Xian 710062, China“,”State
论文部分内容阅读
This paper reports that an atomic scale study of [(-1)10] symmetrical tilt grain boundary (STGB) has been made with modified analytical embedded atom method (MAEAM) for 44 planes in three noble metals Au, Ag and Cu. For each metal, the energies of two crystals ideally joined together are unrealistically high due to very short distance between atoms near the grain boundary (GB) plane. A relative slide between grains in the GB plane results in a significant decrease in GB energy and a minimum value is obtained at specific translation distance. The minimum energy of Cu is much higher than that of Ag and Au, while the minimum energy of Ag is slightly higher than that of Au. For all the three metals, the three lowest energies correspond to identical (111), (113) and (331) boundary successively for two translations considered; from minimization of GB energy, these boundaries should be preferable in [(-1)10] STGB for noble metals. This is consistent with the experimental results. In addition, the minimum energy increases with increasing reciprocal planar coincidence density ∑, but decreases with increasing relative interplanar distance d/a.
其他文献
The early stages of hydrogenated nanocrystalline silicon (nc-Si:H) films deposited by plasma-enhanced chemical vapour deposition were characterized by atomic fo
This paper proposes a scheme for teleporting a two-atom entangled state using leaky cavities. It uses resonant atom-cavity interaction to map the atomic state o
本论文以红色长春花种子和盆栽植株为试验材料,从长春花无菌芽诱导增殖、愈伤组织诱导与芽分化、组培苗生根诱导及枝条扦插生根四个方面进行研究。研究了0.1%HgCl2、10%NaClO对长春花种子消毒灭菌的影响；基本培养基种类对长春花无菌芽诱导增殖及生根的影响；生长调节剂种类、浓度及配比对长春花无菌芽增殖、愈伤组织诱导与芽分化、组培苗生根、插穗生根的影响；取材部位对长春花愈伤组织诱导、芽分化以及插穗生根
油菜是我国重要的油料作物之一,其种植面积和产量居世界前列。油菜在生长发育过程中常常受到病害、虫害和杂草等生物逆境的胁迫,对油菜生产造成很大的经济损失。为了改善油菜的抗病虫害的能力,利用转基因技术将一些抗病、虫以及抗除草剂等基因转入到甘蓝型油菜品种(系)中,为创造油菜新的抗性资源带来了新的机遇。本研究采用农杆菌介导法将Bt抗虫基因Cry1C、Cry2A导入甘蓝型油菜7-5,Westar中,再以分别转
In this paper, a new kind of light beam called off-axial elliptical cosine-Gaussian beam (ECosGBs) is denned by using the tensor method. An analytical propagati
In this paper, we have studied the unified symmetry of a nonholonomic mechanical system in phase space. The definition and the criterion of a unified symmetry o
Microwave characteristics of MgB2/Al2O3 superconducting thin films were investigated by coplanar resonator technique.The thin films studied have different grain
生态浮床技术是应用于改善河湖水质和美化水体的有效方法之一.本文对生态浮床进行了简要介绍,讨论分析了目前生态浮床设计中存在的问题,在此基础上提出了生态浮床的改进方案,
In this paper, a Birkhoff-Noether method of solving ordinary differential equations is presented. The differential equations can be expressed in terms of Birkho
Using the numerical solution of the time-dependent Schr(o)dinger equation of a one-dimensional model atom in a two-colour laser field, we have investigated the