排序方式: 共有95条查询结果,搜索用时 15 毫秒
81.
Existence and Stability of Two-Dimensional Compact-Like Discrete Breathers in Discrete Two-Dimensional Monatomic Square Lattices 下载免费PDF全文
Two-dimensional compact-like discrete breathers in discrete two-dimensional monatomic square lattices are investigated by discussing a generalized discrete two-dimensional monatomic model. It is proven that the two- dimensional compact-like discrete breathers exist not only in two-dimensional soft Φ4 potentials but also in hard two-dimensional Φ4 potentials and pure two-dimensional K4 lattices. The measurements of the two-dimensional compact-like discrete breather cores in soft and hard two-dimensional Φ4 potential are determined by coupling parameter K4, while those in pure two-dimensional K4 lattices have no coupling with parameter K4. The stabilities of the two-dimensional compact-like discrete breathers correlate closely to the coupling parameter K4 and the boundary condition of lattices. 相似文献
82.
83.
高温氧化是限制钒合金应用的主要原因之一。利用第一性原理计算了Ti、Cr杂质原子掺入钒基体后,O在钒合金中的杂质形成能的变化。结果表明:O杂质原子在钒中占据八面体间隙位更稳定,且杂质形成能为-4.65eV,Ti掺杂会降低O的杂质形成能,使O在晶体内部扩散更容易,Cr掺杂的情况与Ti掺杂相反。并且还计算了体系电子结构、布局分布和电荷密度,进一步分析所得到的结论与杂质形成能的计算结果一致。 相似文献
84.
The dynamics of nonstationary solutions in one-dimensional two-component Bose-Einstein condensates 下载免费PDF全文
This paper investigates the dynamical properties of nonstationary solutions in one-dimensional two-component Bose-Einstein condensates.It gives three kinds of stationary solutions to this model and develops a general method of constructing nonstationary solutions.It obtains the unique features about general evolution and soliton evolution of nonstationary solutions in this model. 相似文献
85.
86.
87.
88.
89.
3 低维体系的生长制备和分析3 .1 生长制备传统的电子材料和器件加工中使用以下几种工艺来形成细小尺寸的图形 .1 )光刻和电子束刻蚀 :最小刻蚀尺度受衍射限制 ,对可见光 ,最小刻蚀尺度~ 0 .1 5μm,使用软 X射线可降至 0 .0 1μm,高能电子束刻蚀可达 0 .0 2 μm,若使用无机抗蚀剂还可降到1 nm,可用来形成量子线和量子点 .2 )腐蚀 :包括化学腐蚀和等离子体腐蚀 .化学腐蚀必然留下一些残留物 ;等离子体工艺过程中的 H原子可能进入材料 ,在 50 nm或更深的深度内改变掺杂浓度的深度分布 .3 )离子注入 :虽然使用适当厚度的掩膜可获得注入区和… 相似文献
90.