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对反夹心体系[M(AIP)](C5H5)[M'(AIP)](M, M'=V, Cr, Mn; AIP=1-氨基-3-亚氨基-1-丙烯脱氢阴离子, C3N2 )进行了理论研究. 结果表明, V-Cr体系存在五重态、 七重态和九重态的多稳态构型; Cr-Mn体系存在三重态、 五重态和七重态的多稳态构型. 在上述体系中, 金属原子的价态会随着异构体自旋态的不同而有所改变, V, Cr和Mn原子均可出现+1和+2价. 由于V-Cr和Cr-Mn体系一些双稳态构型间的自旋交叉能垒较低, 这使自旋交叉和价态互变过程变得可能. 解离能的研究结果表明, V-Cr体系解离能较大, 而Cr-Mn体系解离能略小, 两类体系均较稳定. [M(AIP)](C5H5)[M'(AIP)]存在自旋交叉和价态互变的可能性, 并具有较好的解离稳定性, 具有成为分子磁性材料的潜能. 相似文献
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提出了基于抗体浓度的克隆选择多目标优化算法(CCSMOA),该算法借鉴生物克隆选择的机理,针对算法克隆倍数选择的问题,将克隆倍数表示为抗体浓度的函数,并将抗体浓度与抗体-抗原的亲和力及抗体间的亲和度相关联,以此来寻找靠近真实Pareto前沿及分布均匀的解.通过与经典的NSGA2、SPEA2以及当前的NNIA算法对比分析表明,在收敛性和分布性方面CCSMOA算法有所改善.最后将CCSMOA算法用于无线传感网络的覆盖优化. 相似文献
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We study the photon statistics of pulse-pumped four-wave mixing in fibers with weak coherent signal injection by measuring the intensity correlation functions of individual signal and idler fields. The experimental results show that the intensity correlation function of individual signal(idler) field g_(s(i))~(2) decreases with the intensity of signal injection. After applying narrow band filter in signal(idler) band, the value of g_(s(i))~(2) decreases from 1.9 ± 0.02(1.9 ± 0.02) to 1.03 ± 0.02(1.05 ± 0.02) when the intensity of signal injection varies from 0 to 120 photons/pulse. The results indicate that the photon statistics changes from Bose–Einstein distribution to Poisson distribution. We calculate the intensity correlation functions by using the multi-mode theory of four-wave mixing in fibers. The theoretical curves well fit the experimental results.Our investigation will be useful for mitigating the crosstalk between quantum and classical channels in a dense wavelength division multiplexing network. 相似文献
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Wen-Yan Zhang 《中国物理 B》2021,30(11):114212-114212
We report experimental observations performed using a net anomalous dispersion Er-doped fiber ring laser without polarization-selective elements, highlighting the domain-wall solitary pulses generated under the incoherent polarization coupling. By adjusting the pump power and the polarization state appropriately, bright and dark solitons can stably co-exist in the cavity, both centered at 1562.16 nm with a 3-dB spectral width of ~ 0.15 nm and a repetition rate of 3.83 MHz. Moreover, the 0.8 mm long thulium-doped fiber (TDF) facilitated the mode-locking and self-starting of the laser. This is the first demonstration of a laser being used to generate bright and dark solitons synchronously while using TDF as the saturable absorber (SA). Except possessing the all-fiber structure, the laser exhibits good stability, which may have a significant influence on improvement of the pulse-laser design, and may broaden practical applications in optical sensing, optical communication, and soliton multiplexed systems. 相似文献