共查询到18条相似文献,搜索用时 62 毫秒
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通过引入权重,并用一能级数等于简并谱的无趋向性序列为标准去衡量 简并邻间距谱的趋向性,由此建立分析简并谱涨落统计特征稳定性的MKS无参量试验法;根 据该方法,具体分析、比较了H2O分子低激发态与高激发态振动能谱涨落统计特征,找出 了从低激发态向高激发态过度时涨落统计特征明显改变点。 相似文献
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三原子分子体系振动能谱的涨落统计特征 总被引:1,自引:0,他引:1
文中对一系列三原子分子模型体系的振动能量本征值谱进行了涨落统计分析,探讨了组成原子质量和键角因素对能谱涨落统计特征的影响及规律。计算结果表明,折合质量的增大,键角的减小等分子结构特征,都将导致能谱结构混沌化程度的增高。 相似文献
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分析了C6 H6 分子振动能谱的涨落统计特征 .研究结果显示 ,C6 H6 分子振动能谱的涨落统计特征属于低Poisson型 ,即谱刚度值大于Poisson型与Wigner型 ,而能谱分维函数值则小于Poisson型与Wigner型 ,这是一种与通常的Poisson型、Wigner型完全不同的类型 ,该特性在一定程度上反映了C6 H6 分子结构的特殊性 . 相似文献
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三原子分子体系振能谱的涨落统计特征 总被引:3,自引:0,他引:3
文中对一系列三原子分子模型体系的振动能量本征值谱进行了涨落统计分析,探讨了组成原子质量和键角因素对能谱小组涨落统计特征的影响及规律。计算结果表明,折合质量的增大,键角的减小等分子结构特征,都将导致能谱结构混沌化程度的增高。 相似文献
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运用简单的模型,进行了数值计算和研究了可积量子系统的能谱涨落统计特征,揭示了其特征可能出现的低或高Poisson律行为。 相似文献
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高激发态原子光谱可表现出丰富而的涨落行为,对稀土原子光谱进行了较为系统的涨落统计分析研究。结果表明:稀土原子光谱遵多普遍的能谱涨落统计规律;随能量区域的增高,能谱的不规则程序也随之增高。 相似文献
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高激发态原子光谱可表现出丰富而典型的涨落行为。对稀土原子光谱进行了较为系统的涨落统计分析研究,结果表明:稀土原子光谱遵从普遍的能谱涨落统计规律;随能量区域的增高,能谱的不规则程度也随之增高。 相似文献
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荧光涨落谱方法(Fluorescence Fluctuation Spectroscopy)通过分析微小探测区域内的荧光涨落信号,获得粒子亮度、扩散系数以及溶液浓度等信息。利用Monte Carlo模拟方法,研究了溶液中自荧光背景和系统噪声对荧光涨落谱的影响。结果表明,利用双组分光子计数统计方法,可以有效去除低亮度、高浓度背景组分自荧光和均匀分布系统噪声产生的影响。本结果为利用荧光涨落谱方法测量细胞体系复杂环境中的蛋白质相互作用提供帮助。 相似文献
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From the point of view of the interplay between order and chaos, the most regular single-particle motion of neutrons has been found in the superheavy system with Z = 120 and N = 184 based on the Skyrme-Hartree-Fock model and in the system with Z = 120 and N = 172 based on the relativistic mean-field model. It has been shown that the statistical analysis of spectra can give valuable information about the stability of suprheavy systems. In addition it may yield deep insight into the single-particle motion in the mean field formed by the superheavy system. 相似文献
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三维荧光光谱技术(3DEEM)因其方便迅速、灵敏度高等一系列优点,广泛应用于表征DOM。在实际应用中,3DEEM步骤较为繁琐,PARAFAC等方法相较于寻峰法虽然更加直观可靠,但是往往需要借助MATLAB等数学软件,因此该研究希望借助一种新的方法能够更加简便迅速地表征DOM。以蘑菇湖水体DOM为例,基于累积性发射光谱(AFEs),结合多元统计及二阶导数等方法,对DOM各类荧光组分及含量进行表征。利用主成分分析(PCA)对AFEs进行因子载荷分析, 并确定荧光峰的类型及其含量的差异; 通过二阶导数转换,得到二阶导数AFEs;通过对所有采样点二阶导数AFEs各荧光峰进行绝对面积积分,分析DOM中各组分的含量及变化;通过聚类分析, 分析不同点位组分的差异性或相似性。研究表明,通过AFEs得到5类荧光峰,分别为类蛋白峰、类富里酸峰、陆源类腐殖酸峰以及腐殖酸峰。基于AFEs及其对荧光强度之和的分析,可以看出蘑菇湖水体中的DOM主要以不稳定、易被降解的、相对分子质量较小的类蛋白及富里酸为主,腐殖化程度由滨湖区向深湖区递减。基于AFEs得分图,得到5类荧光峰,且荧光峰中类蛋白及类富里酸峰占主导;基于点位得分矩阵,可以说明各点位之间的荧光组分存在差异。二阶导数AFEs被分为5个荧光波段, DOM以相对质量较小的有机质为主,腐殖化程度、芳香度较小,空间差异上不显著。通过对荧光峰面积以及采样点进行聚类分析,荧光峰被分为3类,其中富里酸含量占比较大,且岸边采样点和位于湖心区域的采样点之间存在差异。综上研究显示,AFEs相对简单迅速,能够代替3DEEM对DOM进行表征。蘑菇湖水体DOM是以相对分子质量较小、不稳定、易被降解的类蛋白、类富里酸物质为主,总体上腐殖化程度及相对分子质量具有由滨湖区向深湖区递减的趋势,但空间上差异性较小。 相似文献
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BAI Hong-Bo ZHANG Jin-Fu ZHOU Xian-Rong 《理论物理通讯》2005,44(11)
We study the energy level statistics of the SO(5) limit of super-symmetry U(6/4) in odd-A nucleus using the interacting boson-fermion model. The nearest neighbor spacing distribution (NSD) and the spectral rigidity (△3)are investigated, and the factors that affect the properties of level statistics are also discussed. The results show that the boson number N is a dominant factor. If N is small, both the interaction strengths of subgroups SOB(5) and SOBF(5)and the spin play important roles in the energy level statistics, however, along with the increase of N, the statistics distribution would tend to be in Poisson form. 相似文献
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BAI Hong-Bo ZHANG Jin-Fu ZHOU Xian-Rong 《理论物理通讯》2005,44(5):897-900
We study the energy level statistics of the SO(5) limit of super-symmetry U(6/4) in odd-A nucleus using the interacting boson-fermion model. The nearest neighbor spacing distribution (NSD) and the spectral rigidity (Δ3) are investigated, and the factors that affect the properties of level statistics are also discussed. The results show that the boson number N is a dominant factor. If N is small, both the interaction strengths of subgroups SO^B(5) and SO^BF (5) and the spin play important roles in the energy level statistics, however, along with the increase of N, the statistics distribution would tend to be in Poisson form. 相似文献
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The transverse momentum spectra of different types of particles, , , p and , produced at mid-(pseudo)rapidity in different centrality lead–lead (Pb–Pb) collisions at 2.76 TeV; proton–lead (p–Pb) collisions at 5.02 TeV; xenon–xenon (Xe–Xe) collisions at 5.44 TeV; and proton–proton (p–p) collisions at 0.9, 2.76, 5.02, 7 and 13 TeV, were analyzed by the blast-wave model with fluctuations. With the experimental data measured by the ALICE and CMS Collaborations at the Large Hadron Collider (LHC), the kinetic freeze-out temperature, transverse flow velocity and proper time were extracted from fitting the transverse momentum spectra. In nucleus–nucleus (A–A) and proton–nucleus (p–A) collisions, the three parameters decrease with the decrease of event centrality from central to peripheral, indicating higher degrees of excitation, quicker expansion velocities and longer evolution times for central collisions. In p–p collisions, the kinetic freeze-out temperature is nearly invariant with the increase of energy, though the transverse flow velocity and proper time increase slightly, in the considered energy range. 相似文献