排序方式: 共有86条查询结果,搜索用时 15 毫秒
81.
基于分数阶系统稳定性理论,提出了用状态观测器来实现分数阶混沌系统完全状态投影同步的思想. 设计的状态观测器能够实现一类非线性分数阶系统的完全状态投影同步而不要求分数阶混沌系统是部分线性的,推广了投影同步的应用范围,且无需计算系统的条件Lyapunov指数. 另外,该方法理论严格,设计简单,能够达到任意比例因子的完全状态同步. 最后,利用该方法实现了分数阶Rssler系统的完全状态投影同步,数值仿真结果证实了它的有效性.
关键词:
分数阶
混沌系统
状态观测器
投影同步 相似文献
82.
Phase Transition and Melting Curves of Calcium Fluoride via Molecular Dynamics Simulations 下载免费PDF全文
The phase transition and melting curves of CaF2 are investigated by using the general utility lattice programme (CULP) via the shell model with molecular dynamics method. By calculating the entropy H (at OK) and Cibbs free energy G^* (at 30OK), we find that the phase transition pressure from the face-centred cubic (fee) structure to the orthorhombic structure is 11.40 CPa and 9.33 CPa at OK and 300K, respectively. The modified melting point of the fee CaF2 is in the range of 1650-1733K at OCPa. All these results are well consistent with the available experimental data and other theoretical results. We also obtain that the melting temperature of high pressure phase is 990-1073 K at 10 CPa. Moreover, the temperature dependences of the elastic constants Cij, bulk module B and shear module G are also predicted. 相似文献
83.
PH3分子高能振动谱的非线性模型计算 总被引:1,自引:1,他引:0
利用非线性量子理论中的一个三参数模型-量子化的离散自陷方程-对PH3分子处于高能振动态下的PH键的伸缩振动能谱进行了理论计算(1≤n≤7,n为PH3分子的总振动量子数)获得了与实测谱数据符合较好的结果(其均方根RMS偏差约为3.88cm^-1)预测了一些泛频和组频谱带的中心位置,并将振动能级按地称性进行了归类,在计算过程中,模型Hamilton算符H中所包含的描述PH键非谐振动的参数λ和描述PH键 相似文献
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85.
采用基于密度泛函理论的平面波赝势方法,研究了沿[001]方向单轴应变条件下Fe从体心立方结构(bcc,α相)到六角密排结构(hcp,ε相)相变的临界压力、相变路径、相变势垒以及相变过程中原子磁性的变化.结果发现:单轴应变条件下Fe从α到ε结构的相变路径与以前理论计算模拟给出的静水压力条件下的相变路径明显不同;原子磁矩沿着相变路径突然降低,同时伴随着能量和体积的突然变化,是典型的一阶磁性相转变,表明原子磁性的丧失导致了bcc结构不稳定而向hcp结构转变.对单轴应变下吉布斯自由能的计算表明,相变势垒随着单轴应
关键词:
相变
单轴应变
第一性原理
铁 相似文献
86.
We investigate the equilibrium lattice constant, bulk modulus, elastic constants and Debye temperature of Li2O under pressure by using ab initio unrestricted Hartree-Fock (HF) linear combination of atomic orbital (LCAO) periodic approach. The obtained results at zero pressure are well consistent with the available experimental data and other theoretical results, It is found that the elastic constants C11, C12 and C44 and bulk modulus B increase monotonously as pressure increases. Also, the anisotropy will weaken and the Debye temperature will rise with pressure increasing. 相似文献