一种面向IaaS租户的资源完整性度量协议

提出一种IaaS(infrastructure as a service)完整性度量协议,该协议允许租户主动发起对IaaS资源的度量和验证,使租户能够检测其自身资源的完整性状态,增强IaaS资源状态的可见性.利用SVO逻辑对协议的安全性、完备性进行了分析,并搭建实验平台对协议的抗攻击能力和时间性能进行了验证.分析和实验证明,该协议能够抵御重放攻击、假冒攻击等多种形式的攻击,同时协议的执行耗时不会影响租户的正常使用体验.     

五次NLS方程全离散谱格式的大时间性态

Nonlinear Schroedinger equation arises in many physical problems. There are many works in which properties of the solution are studied. In this paper we use fully discrete Fourier spectral method to get an approximation solution of nonlinear weakly dissipative Schroedinger equation with quintic term. We give a large-time error estimate and obtain the existence of the approximate attractor A N^k.     

Simulation study of the two-time intensity correlation function of a two-mode laser system with both pump and quantum noises

This paper investigates the two-time intensity correlation function of a two-mode ring laser system subjected to both pump and quantum noises by stochastic simulation. It finds that the decay rate of the intensity correlation function of one mode gets faster with decreasing values of relevant parameters, i.e., the coupling constant ξ, the cross-correlation coefficient λ , the difference of the pump parameters Δa and the pump parameter a₁; however, its variations get complex in the other mode when relevant parameters are changed. The investigating results also show that the effects of the mode competition on intensity correlation function are obvious.     

非线性KdV-Schr(o)dinger方程Fourier谱逼近的大时间性态

近几年来,对具弱阻尼的非线性发展方程的研究越来越受到人们的关注.大部分情况下,由于精确解无法得到,我们只有通过求数值解来研究方程解的性质.本文讨论具弱阻尼的非线性KdV-Schroedinger方程Fourier谱逼近的大时间性态问题.我们构造了方程的Fourier近似谱格式,并对方程的近似解作了相应的先验估计及方程近似解与精确解之间的误差估计.最后,证明了近似吸引子AN的存在性及其弱上半连续性dω(AN,A)→0.     

能量转换纳米医学和生物材料

传统癌症治疗方法(如化疗、放疗和手术切除等)存在对正常组织的严重毒副作用和治疗效果差等缺点,从而阻碍了其在临床治疗中的进一步应用.随着纳米技术和纳米医学的快速发展,能量转换生物材料介导的治疗方式,由于其具有非侵入性、较强的组织穿透能力和对治疗剂量的精准调控等优势而受到广泛关注和研究.本文总结了近年来本研究团队在"能量转换生物材料"(包括光-热转换、光-化学能转换、超声-化学能、超声-热能转换、磁-热能转换和化学能-化学能转换)的设计、制备及其在癌症治疗中的应用,并讨论了"能量转换纳米医学和生物材料"在未来临床转化中的应用前景和面临的挑战.     

Calculation of Covariance Matrix for Multi-mode Gaussian States in Decoherence Processes

We investigate the dynamics of n single-mode continuous variable systems in a generic Gaussian state under the influence of the independent and correlated noises making use of the characteristic function method. In two models the bath is assumed to be a squeezed thermal one. We derive an explicit input-output expression between the initial and final covariance matrices. As an example, we study the evolution of entanglement of three-mode Gaussian state embedded in two noisy models.     

乙醇-水团簇分子发射荧光的机理研究

利用含时密度泛函理论分别计算了乙醇分子、水分子、以及乙醇和水形成的新团簇分子的基态和激发态能级,得出了各自吸收光能量和光波长的理论极限值;利用分析化学的理论分析了链式的乙醇-水团簇分子的特殊结构,得到了基态团簇分子间形成碰撞复合物的结论;利用量子力学的态叠加原理和量子化学的轨道理论,并结合Hckel近似对该复合物的能级和对应波函数进行了计算和推导,从而解释了乙醇-水溶液能吸收较长波长的光并发射荧光的机理.     

基于数学形态学的金字塔图像去噪

提出了一种自适应提升拉普拉斯金字塔变换与数学形态算子相结合的图像去噪方法.首先对图像进行分解,采用自适应提升拉普拉斯金字塔,然后利用自适应提升拉普拉斯金字塔变换后系数能量的分布特性以及尺度内和尺度间的依赖性,结合数学形态算子的特点,利用数学形态算子对变换系数进行处理,使得重要变换系数与非重要变换系数分离,分别对两个不同的子集采用不同的阈值进行处理后,再将两个子集合起来,进行逆变换重建.实验结果表明,该算法具有良好的去噪效果,同时保留了图像的细节信息,获得了较高的图像信噪比.     

Double-Exponentially Decayed Photoionization in CREI Effect： Numerical Experiment on 3D H2^＋

On the platform of the 3D H2^＋ system, we perform a numerical simulation of its photoionization rate under excitation of weak to intense laser intensities with varying pulse durations and wavelengths. A novel method is proposed for calculating the photoionization rate： a double exponential decay of ionization probability is best suited for fitting this rate. Confirmation of the well-documented charge-resonance-enhanced ionization （CREI） effect at medium laser intensity and finding of ionization saturation at high light intensity corroborate the robustness of the suggested double-exponential decay process. Surveying the spatial and temporal variations of electron wavefunctions uncovers a mechanism for the double-exponentially decayed photoionization probability as onset of electron ionization along extra degree of freedom. Henceforth, the new method makes clear the origins of peak features in photoionization rate versus internuclear separation. It is believed that this multi-exponentially decayed ionization mechanism is applicable to systems with more degrees of motion.     

智柔超材料及其力学性能的研究进展

力学超材料(或超结构)因其独特的微观结构设计而展现超常的物理和力学特性.将力学超材料设计思想与智能柔性(简称智柔)材料相结合,可以制备出具有自感知和自驱动功能的智柔力学超材料(简称智柔超材料).本文对近年来智柔超材料的研究现状和进展进行了评述,分析了此类材料的基本设计思想、变形机理及力学特性,重点关注了基于形状记忆聚合物和水凝胶智柔超材料的设计原理和性能分析方法;阐释了先进制造技术为智柔超材料发展带来的机遇,并讨论了此类材料在设计和开发方面面临的关键问题以及未来发展趋势.