排序方式: 共有74条查询结果,搜索用时 15 毫秒
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研究了在乘性和加性色噪声以及加性非对称双值噪声作用下方波信号驱动的延迟双稳系统中的随机共振现象。基于小延迟近似,在绝热近似条件下推导出了系统输出信噪比(Signal-to-Noise Ratio, SNR)的解析形式。分析结果表明,随着双值噪声强度与非对称性参数、方波信号幅度以及乘性和加性色噪声强度的变化,SNR表现出了随机共振行为。随着延迟时间、色噪声相关时间和系统参数的增大,SNR作非单调变化。 相似文献
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Stochastic Resonance in a Time-Delayed Mono-Stable System with Multiplicative and Additive Noise 下载免费PDF全文
The stochastic resonance (SR) in a time-delayed mono-stable system driven by multiplicative white noise, additive white noise, additive dichotomous noise as well as a periodic square-wave signal is considered from the view of the signal-to-noise ratio (SNR). It is found that the SNR increases monotonically with the increase of the delay time. The SNR exhibits the SR behavior when it is plotted as a function of intensities of the noises, displaying the asymmetry of the dichotomous noise. The SNR varies non-monotonically with the increase of the system parameter and the amplitude of the input square-wave signal. 相似文献
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槐花样品经蒸气蒸馏及乙醚萃取处理所得挥发油,用气相色谱-质谱联用法进行分析,按峰面积归一化法求出挥发性化学成分的相对含量.分离出42个峰,已鉴定了26个化合物,占其挥发油总相对含量的87.76%.已鉴定的有酸、酯、烯烃、醇、烷烃等10类化合物.其中酸类化合物占总色谱流出峰面积的30.53%,酯类占19.26%,烯烃类占18.01%,醇类占8.64%,烷烃类占5.52%.其主要组分有n-十六酸(26.43%)、17-三十五(烷)烯(14.84%)、喇叭茶萜醇(8.00%)、十六酸甲酯(4.18%)、肉豆蔻酸(4.10%)、8,11-十八碳二烯酸甲酯(3.79%)、月桂酸酐(3.60%)、9-十八(碳)炔酸甲酯(3.26%)、1,2-邻苯二甲酸丁基环己基酯(3.03%)、c-榄香烯(2.66%). 相似文献
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在AZ91D镁合金中添加稀土元素Ce和Y,研究了Ce,Y元素在铸态AZ91D镁合金中的存在形式以及对合金组织和性能的影响。结果表明,铸态AZ91D镁合金中加入的Ce,Y大部分形成Al4Ce和Al2Y化合物,少量剩余的Ce,Y部分取代Mg元素的位置,以代位固溶的形式固溶在α-Mg固溶体和β-Mg17Al12金属间化合物中;Ce,Y能够细化镁合金铸态组织的晶粒,使Mg17Al12相发生"断网"并减少其在组织中的相对比例;适量添加Ce,Y能够提高AZ91D镁合金铸态机械性能,其主要原因是Ce,Y的细晶作用、固溶强化作用、Al-RE相的第二相强化作用以及对Mg17Al12相强化作用的改善。 相似文献
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The stochastic resonance in an over-damped bias linear system subject to multiplicative and additive dichotomous noise (DN) is investigated. By using the linear-response theory and the properties of the DN, the exact expressions are found for the signal-to-noise ratio (SNR). It is shown that the SNR is a non-monotonic function of the correlation time of the additive DN, and it varies non-monotonically with the bias of the external field, the intensity and asymmetry of the multiplicative DN, as well as the external field frequency. Moreover, the SNR depends on the bias of the system, as well as the strength and asymmetry of the additive DN. 相似文献
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