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研究了一类次临界增长的N-Laplacian方程.利用Trudinger-Moser不等式和Morse理论,证明了在不具有山路引理的几何性质、不满足Ambrosetti-Rabinowitz条件及整体符号条件下,该方程非平凡解的存在性. 相似文献
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指纹作为犯罪现场最常见、且运用历史最久的重要物证,因其人各不同,终身基本不变的特性广泛运用于人身判定。但除了形态学特征外,指纹物质中所包含的化学信息对于遗留者特征的刻画和个体行为的追踪溯源也具有重要价值,不仅能为侦查人员提供分析线索,还能一定程度上解决因现场指纹模糊或部分缺失导致的证据价值丢失问题。本文从指纹中的内源性物质和外源性物质分析两大角度,对基于不同指纹物质进行人群特征的分析研究进行了探讨,总结了多种指纹物质的化学分析方法,并对其优势进行评述,以期为未来指纹物质相关的研究提供新的思路。 相似文献
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The influence of 3d-metal alloy additions on the elastic and thermodynamic properties of CuPd3
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Embedded-atom method (EAM) potentials are used to investigate the effects of alloying (e.g. 3d-metals) on the trends of elastic and thermodynamic properties for CuPd3 alloy. Our calculated lattice parameter, cohesive energy, and elastic constants of CuPd3 are consistent with the available experimental and theoretical data. The results of elastic constants indicate that all these alloys are mechanically stable. Further mechanical behavior analysis shows that the additions of Cr, Fe, Co, and Ni could improve the hardness of CuPd3 while V could well increase its ductility. Moreover, in order to evaluate the thermodynamic contribution of 3d-metals, the Debye temperature, phonon density of states, and vibrational entropy for CuMPd6 alloy are also investigated. 相似文献
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Einstein-Podolsky-Rosen纠缠态光场是实现基于光纤的连续变量量子信息处理的重要量子光源,其在光纤信道分发时会与信道相互作用发生解纠缠,影响量子信息处理的性能.本文利用部分转置正定判据分析了Einstein-Podolsky-Rosen纠缠态光场在单通道和双通道光纤信道分发方案中,其初始态的关联正交分量对称性、模式对称性、纯度和光纤信道额外噪声对传输距离、纠缠态光场的纠缠特性及鲁棒性的影响.在单通道和双通道方案中,光纤信道的额外噪声都会引起纠缠态光场的解纠缠,随着噪声的增大,传输距离迅速减小.要保持Einstein-Podolsky-Rosen纠缠态光场在光纤损耗信道中的纠缠鲁棒性,双通道方案比单通道方案对初始态的关联正交分量对称性和纯度方面的要求更为苛刻.而且单光纤噪声通道分发方案对模式对称性参数不敏感,模式对称性参数变化不会引起解纠缠,也不影响最大传输距离和纠缠鲁棒性特征;在双光纤噪声通道分发时,模式不对称参数降低会减小最大传输距离,并出现纠缠突然死亡. 相似文献
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Chaotic systems perform well as a new rich source of
cryptography and pseudo-random coding. Unfortunately their digital
dynamical properties would degrade due to the finite computing
precision. Proposed in this paper is a modified digital chaotic
sequence generator based on chaotic logistic systems with a coupling
structure where one chaotic subsystem generates perturbation signals
to disturb the control parameter of the other one. The numerical
simulations show that the length of chaotic orbits, the output
distribution of chaotic system, and the security of chaotic
sequences have been greatly improved. Moreover the chaotic sequence
period can be extended at least by one order of magnitude longer
than that of the uncoupled logistic system and the difficulty in
decrypting increases 2128*2128 times indicating that the
dynamical degradation of digital chaos is effectively improved. A
field programmable gate array (FPGA) implementation of an algorithm
is given and the corresponding experiment shows that the output
speed of the generated chaotic sequences can reach 571.4~Mbps
indicating that the designed generator can be applied to the
real-time video image encryption. 相似文献