基于Cent OS操作系统的虚拟机应用系统设计探究

虚拟化是信息技术飞速发展的一个积极成果,并越来越引起了IT届的高度重视,其低硬件投资、高工作效率技术令人耳目一新,建立在各种操作系统平台上的虚拟化技术也不断涌现,本文就基于Cent OS操作系统的虚拟机应用系统的设计及其具体架构方案做出新的尝试。     

Direct Evidence of Nucleation During the Induction Period of Polyethylene Crystallization by SAXS

Direct evidence that nuclei are formed during the induction period of crystallization is obtained for the first time by means of small-angle X-ray scattering (SAXS). Polyethylene (PE) was used as a model crystalline polymer. The nucleating agent was mixed with PE in order to increase the scattering intensity I _x from nuclei as large as 10⁴ times bigger than usual. I _x increased soon after quenching to the crystallization temperature from the melt and saturated after some time. A new theory is proposed to estimate the size of the nuclei N, the number density distribution of nuclei with N at time t, f(t,N), and the induction time τ _i, by analyzing the SAXS scattering intensity. The volume-averaged size of the nuclei was nearly the same as that of critical nuclei and does not change so much with time during the induction period. Lamellae start stacking much later than nuclei start forming.     

可信平台上操作系统核心文件检测研究与实现

对操作系统核心文件的检测是遵循TCG规范的可信计算平台的重要组成部分,因此提出了一种基于直接访问磁盘扇区数据来检测可信平台上操作系统核心文件完整性的方法。在系统实现中,使用了扇区检测优化技术和逐级恢复关键文件数据的方法,设置了扫描配置文件和管理完整性度量值的SFS(简单文件系统)来方便用户管理。测试结果表明系统能够快速发现操作系统核心文件是否被篡改,有效抵御病毒和木马的攻击破坏,实现灾难恢复。     

智能手机信息安全防范系统设计与研究

论文研究设计了一个智能手机信息安全防范系统,该系统融合了实时监控、病毒查杀,短信过滤、短信举报等功能。     

Evaluating Shielding‐Based Ring‐Current Models by Using the Gauge‐Including Magnetically Induced Current Method

Magnetically induced current densities and integrated ring‐current strength susceptibilities have been calculated at the density functional theory (DFT) level for a test set consisting of 17 ring‐shaped molecules using the gauge‐including magnetically induced current (GIMIC) method. Reliable values for the ring‐current strengths have been obtained by performing numerical integration of the current‐density susceptibility passing a cut plane perpendicularly to the molecular ring. The current densities and ring current strengths were calculated at the DFT level using the B3LYP functional and def2‐TZVP basis sets. Current densities and ring‐current strengths have also been calculated at the Hartree‐Fock self‐consistent field (HF‐SCF) level using Dunning’s aug‐cc‐pVTZ basis sets, which allow a direct comparison with ring‐current strengths that have previously been estimated using ring‐current models based on magnetic shielding calculations. Current density calculations at both levels of theory show that the magnetic shielding based ring‐current models are not a very accurate means to estimate the magnetically induced ring current strengths, whereas they provide qualitatively the correct aromaticity trends for the studied molecules.     

内含式复合物X@(HAlNH)12 (X=Be,Mg, Ca,Zn, Al+, Ga+)的结构和稳定性

在研究闭式多面体(HAlNH)12簇合物几何构型及稳定性的基础上, 用DFT的B3LYP方法在6-31G(d)的水平上, 对其内含式复合物X@(HAlNH)12 (X= Be, Mg, Ca, Zn, Al+, Ga+)进行了构型优化和能量计算, 并讨论了稳定结构的几何构型、自然键轨道(NBO)、振动频率、能量参数及NMR数据与结构的关系. 用Gaussian 03的QST3方法确定了客体X通过笼面6-元环的迁移过渡态(TS)结构, 并用IRC方法对所得TS结构进行了验证. 最后得到内含式复合物X@(HAlNH)12结构在热力学和动力学上的稳定性信息, 其中复合物Ga+@(HAlNH)12的结构相对最稳定.     

电刺激小脑顶核治疗脑梗死的临床观察及护理

探讨和观察电刺激小脑顶核治疗脑梗死的疗效。方法 :96例脑梗死患者随机分为治疗组和对照组各 48例 ,治疗组患者在常规药物综合性治疗的基础上 ,同时接受电刺激小脑顶核治疗 ,治疗 1 0d后 ,观察其疗效。结果 :治疗组有效率为 94% ,对照组有效率 87%。两组比较差异具有显著性。结论 :常规药物加电刺激小脑顶核治疗脑梗死有明显疗效 ,有利于患者神经功能的早期康复     

CMTD晶体的螺位错生长机理

用原子力显微镜在有机非线性光学晶体CdHg(SCN)4(H6C2OS)2(CMTD)的(001)面上观察到了许多奇特的心形螺旋生长丘,这种心形线不同于由反向双螺位错发展而成的瑞德环(Frank-Read).我们认为这种心形螺旋生长丘的相邻层交替生长除了与21螺旋轴有关外,还与在台阶源附近形成的结构畴有关.在由心形缺口推展出去的直线"划痕"两侧的台阶流上观察到的相互垂直分布的二维核,使我们认为直线"划痕"可能是90°的结构畴.实验结果说明晶体的结构及台阶源附近的分子键合方向及强度使不同晶体的生长具有独特的规律性.     

雪晶成因及人工造雪分布类型探讨

从雪晶成核和生长两个方面深入探究了雪晶成因机理,讨论了影响雪晶形成过程中各种作用凼素,分析总结了人工造雪分布类型和及其相关的影响因素.对于造雪技术的进一步扩展,以及合理规划滑雪项目,具有较为重要的指导意义.     

CMTD晶体的二维核叠层生长现象

在用原子力显微镜对有机非线性光学晶体CdHg(SCN)4(H6C2OS)2(CMTD)的研究过程中,发现了一种单二维核叠层生长现象,即整个晶体由一个二维核叠层生长丘发展而成.这种生长现象无法用经典的二维核模型解释,于是给出另一种二维核生长模型--二维核叠层模型(terraced nuclear model).二维核叠层模型是传统二维核晶体生长模型的补充.