查询词典 rayleigh quotient

It is proved that the two-dimensional non-hydrostatic Boussinesq equations on the x ? z plane with the kinetic viscous term and the thermal dissipative term are unstable equations in the C 2 function class.2. If we replace the influence of the kinetic viscous term by Rayleigh friction and the thermal dissipative term by Newton cooling, the new generalized equations are stable equations in the C 1 function class. The construction of the solution space and the discriminating method for well-posedness of the problem of determining solution are given.

本文的主要结果如下：1证明了在y方向上均匀的带有运动粘性项以及热耗散项的两维非静力、Boussinesq近似的x-z面上两维旋转流体的控制方程组在C 2函数类中是一个不稳定的方程组。2如果以瑞利摩擦来代替粘性的影响，以牛顿冷却来代替热量的耗散，则所获得的一个新的方程组在C 1函数类中是一个稳定的方程组，给出了其解空间的构造和各种定解问题的适定性的判别方法。

In this paper, the statistical characteristics of one plane and one helicopter's RCS dynamic measurement data are studied by using the χ^2 distributing, log-normal distribution and Rayleigh distributing model, along with the Kolmogorov fit test to goodness, the fitting results in some notableness level are acquired by using the three models for different aspect angles for two targets, and the degree of freedom distribution of χ^2 model in all aspect angles is obtained for two targets' RCS data.

文中以某歼击机和直升机为对象，应用χ^2分布、对数正态分布和瑞利分布模型，以及Kolmogorov拟合优度检验方法，研究其RCS动态测量数据的统计分布特征，得到了在一定显著性水平下，两种目标在不同视向角下对三种模型的拟合效果，同时得到应用χ^2分布拟合时模型半自由度随视向角的分布情况。

A double distribution thermal lattice boltzmann model presented in this paper is to simulate natural convection with metal foams of different porosity,hole density and Rayleigh number.

本文使用格子-Boltzmann方法模拟了充满金属泡沫的封闭方腔自然对流。

Using numerical analysis and visual technology, the parameters of the known Rayleigh van der pol equation are discussed in detail The relation between the limit circle and chaos strange attractors is foun

通过数值分析及科学可视化技术，对著名的 Rayleigh Van Der Pol方程的参数进行较详细的讨论，获得该方程的混沌吸引子与极限环的关系

Firstly, the Signal Noise Ratio characteristic of matched filter despread symbol and the distribution of coherent phase estimation error are derived. Secondly, the exact integration formula of BER for fading channel is presented, moreover, by using the Maclaurin series expansion of MPSK conditional Symbol Error Rate, the simplified BER approximations for BPSK and QPSK are derived over AWGN, Nakagami-m fading and Rayleigh fading channel.

首先推导了匹配滤波解扩符号的信噪比特性和相干相位估计误差的分布；然后给出了衰落信道中误比特率的精确积分式，并利用MPSK条件误符号率的麦克劳林级数形式，推导了AWGN，Nakagami-m衰落和瑞利衰落信道中BPSK，QPSK误比特率的简化逼近式。

Rayleigh-Taylor mechanise anu baroclinic mechanism account for the suppression of flame wrinkles by gravity.

重力压制火焰皱褶的原因是Rayleigh-Taylor机理和斜压机理。

Based on the theory of rayleigh wave propagation in layer medium,the variation of wave velocity can reflect the variation of rock and soil mechanical property.

根据瑞雷面波在层状介质中的传播理论，波速的变化可以反映出岩土力学性质的变化。

The reflection of plane Rayleigh waves from a single microcrack was modeled by FDM and provided an accurate estimation of crack depth.

有限差分法以某个单一的微裂纹为模型，产生平面瑞利波的反射，同时提供一个准确的裂纹深度的估计值。

In terms of average Symbol-Error Rate at the destination, the performances of multi-relay cooperative transmission with Maximal Ratio Combining detection and opportunistic relaying with multi-node listening were analyzed, one relay retransmitting in Amplify-and-Forward networks under independent Rayleigh slow fading channels. The closed-form expressions of SER for M-PSK and M-QAM modulations are also derived based on Moment Generating Function.

该文从接收端平均误符号率的角度，分析了独立的瑞利衰落信道下，采用放大转发的多中继协同最大比合并检测方案和多节点侦听，单中继转发的机会中继方案的性能；并基于矩生成函数推导出两种方案下M-PSK和M-QAM调制信号平均误符号率的闭合表达式。

A model of an additive mixture of Gaussian and non-Gaussian impulsive noise is adopted, and the asymptotical solution of the closed-form expression for the average symbol error rate of orthogonal space-time block coding over Rayleigh flat fading channel is derived by means of the Moment Generating Function with the approximate equivalent Multiple-Input Single-Output model of mixture noise.

采用脉冲和高斯加性混合噪声模型，利用矩母函数分析方法，通过建立多发单收近似等效模型，推导出Rayleigh衰落信道下MISO空时分组码误符号率闭式表达式的渐近解。

Article 144 The Government of the Hong Kong Special Administrative Region shall maintain the policy previously practised in Hong Kong in respect of subventions for non-governmental organizations in fields such as education, medicine and health, culture, art, recreation, sports, social welfare and social

第一百四十四条香港特别行政区政府保持原在香港实行的对教育、医疗卫生、文化、艺术、康乐、体育、社会福利、社会工作等方面的民间团体机构的资助政策。原在香港各资助机构任职的人员均可根据原有制度继续受聘。

Small wonder, then, that the Chinese spend more in the shop than any other group of foreign visitors do .

这样的小惊喜，使中国顾客比任何国家的人消费得更多。