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1.
Optimized growth and dielectric properties of barium titanate thin films on polycrystalline Ni foils 下载免费PDF全文
Barium titanate(BTO) thin films were deposited on polycrystalline Ni foils by using the polymer assisted deposition(PAD) technique.The growth conditions including ambient and annealing temperatures were carefully optimized based on thermal dynamic analysis to control the oxidation processing and interdiffusion.Crystal structures,surface morphologies,and dielectric performance were examined and compared for BTO thin films annealed under different temperatures.Correlations between the fabrication conditions,microstructures,and dielectric properties were discussed.BTO thin films fabricated under the optimized conditions show good crystalline structure and promising dielectric properties with εr~ 400 and tan δ < 0.025 at 100 kHz.The data demonstrate that BTO films grown on polycrystalline Ni substrates by PAD are promising in device applications. 相似文献
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运用非马尔可夫量子理论与熵压缩理论,研究了非马尔可夫环境下经典场驱动Jaynes-Cummings模型中原子的熵压缩,考察了非马尔可夫效应、经典场驱动、体系失谐量对原子熵压缩的影响.用非马尔可夫过程的记忆效应解释了原子熵压缩的动力学行为.结果表明:非马尔可夫效应和经典场驱动的共同作用有利于原子熵压缩的产生与维持.在非马尔可夫环境下,通过选择适当的系统参数,可以产生压缩度大、压缩持续时间长的原子熵压缩态.研究结果为利用光场-原子相互作用制备压缩度大、压缩持续时间长的最佳原子压缩态提供了可能途径. 相似文献
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The population and decay evolution of a qubit under the time-convolutionless master equation 下载免费PDF全文
We consider the population and decay of a qubit under the electromagnetic environment. Employing the time-convolutionless master equation, we investigate the Markovian and non-Markovian behaviour of the corresponding perturbation expansion. The Jaynes-Cummings model on resonance is investigated. Some figures clearly show the different evolution behaviours. The reasons are interpreted in the paper. 相似文献
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采用不同硅铝比的MCM-41负载离子液体,制备得到一系列负载型双酸位催化剂,并用XRD、FTIR、N2-吸脱附、热重分析及TEM对其进行表征,以大豆油与甲醇的酯交换反应为探针实验考察了其催化活性.结果表明,离子液体成功固载于介孔分子筛并能保持其介孔结构,且在酯交换反应中表现出良好的反应活性.在ILs负载量为30%,醇油物质的量的比为36:1,140 ℃下反应5 h,生物柴油收率在90%以上;而分子筛中Al的引入为活性组分离子液体构建了有益的酸环境,促进了其催化活性的提高;与均相离子液体相比,负载型催化剂又能明显提高生物柴油的收率,且回收利用4次后,生物柴油收率仍接近88%. 相似文献
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采用一种新型的电子传输材料TFTTP作为阴极缓冲层提高基于SubPc/C60异质结的有机薄膜太阳能电池的性能. 通过在有机活性层和金属电极之间加入TFTTP界面层,器件的能量转换效率提高了约30%. 系统研究了器件的二极管特性、光电流特性以及内部的光场分布情况,结果表明,TFTTP阴极缓冲层的引入可以有效地提高器件的内建电场,进而增加电荷转移激子的分离效率. 通过使用TFTTP作为阴极缓冲层,在C60/金属界面形成良好的欧姆接触,降低了界面接触电阻,有利于自由载流子的收集. 相似文献
6.
Relation between initial conditions and entanglement sudden death for two-qubit extended Werner-like states 下载免费PDF全文
In this paper, the dynamical behavior of entanglement of an uncoupled two-qubit system, which interacts with inde- pendent identical amplitude damping environments and is initially prepared in the extended Werner-like (EWL) states, is investigated. The results show that whether entanglement sudden death (ESD) of an EWL state will occur or not depends on initial purity and concurrence. The boundaries between ESD states and ESD-free states for two kinds of EWL states are found to be different. Furthermore, some regions are shown where ESD states can be transformed into ESD-free states by local unitary operations. 相似文献
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高维量子系统的纠缠态因其诸多的优点而受到广泛的关注。目前,肖兴等人[Eur.Phys.J.D.(2013)67:204]研究了两个V-型三能级原子系统的演化动力学,得到了弱测量方案能保护系统自由纠缠的结论。本文研究了在振幅阻尼噪声中两个全同三能级原子系统束缚纠缠的演化动力学。在振幅阻尼通道中,前置弱测量和后置弱测量反转操作,实现了对系统束缚纠缠的保护。束缚纠缠保持的时间受量子态参数和弱测量强度的影响。相应的物理原因也得到了合理的解释。对于两个非全同三能级原子的情况,此结论依旧成立。另外,弱测量方案并不是对所有类型的束缚纠缠态都适用,有一定的局限性。 相似文献
9.
Enhancing the thermal conductivity of polymer-assisted deposited Al2O3 film by nitrogen doping 下载免费PDF全文
<正>Polymer-assisted deposition technique has been used to deposit Al2O3 and N-doped Al2O3(AlON) thin films on Si(100) substrates.The chemical compositions,crystallinity,and thermal conductivity of the as-grown films have been characterized by X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),and 3-omega method,respectively. Amorphous and polycrystalline Al2O3 and AlON thin films have been formed at 700℃and 1000℃.The thermal conductivity results indicated that the effect of nitrogen doping on the thermal conductivity is determined by the competition of the increase of Al-N bonding and the suppression of crystallinity.A 67%enhancement in thermal conductivity has been achieved for the samples grown at 700℃,demonstrating that the nitrogen doping is an effective way to improve the thermal performance of polymer-assisted-deposited Al2O3 thin films at a relatively low growth temperature. 相似文献
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开发了一个获得白光条纹的新实验.把劳埃镜干涉和光栅衍射结合起来,有可能使白光源产生的不同颜色的条纹彼此重合,从而能观察到清晰的黑白条纹.讨论了有关的实验原理、装置和方法,介绍了主要的实验关键并提供了相应的测量数据. 相似文献