本文获得了一阶正负周期系数的中立型微分差分方程振动的充分条件。
Some sufficient conditions are obtained for the oscillation of first order neutral differential-difference equations with positive and negative periodic coefficients.
对方程组的周期系数处理以及前飞时的相关参数对旋翼动稳定性的影响等进行了研究。
The treatment of equations with periodic coefficients and the influence of related parameters on rotor dynamic stability were investigated.
利用单调方法讨论了一类含时滞及周期系数的反应扩散系统的竞争-竞争-互惠模型。
By using the monotone method, a periodic reaction diffusion system of a competitor-com - petitor-mutualist is investigated.
证明了具周期系数的边值问题正时间周期解的存在性以及对应初边值问题解的渐近性。
The time periodic solution problem of damped generalized coupled nonlinear wave equations with periodic boundary condition was studied.
本文讨论一类具有脉冲效应和周期系数的两个食饵一个捕食者的捕食-食饵系统的动力学行为。
In this paper, a classical periodic two prey and a predator predator-prey system with impulsive effect is investigated.
采用微分求积法对方程中的空间变量进行离散，得到仅含有时间变量的三阶周期系数微分方程组。
By the discretization of spatial variable in the equation, a third-order differential system of equations containing periodic time-varying coefficient is derived.
建立了大型水平轴风轮转子／塔架耦合系统的气动弹性模型，推导了转子／塔架耦合系统周期系数运动方程，给出了气动弹性稳定性分析方法。
The vibration modal analysis method and the influent factors of the natural frequency of the rotating rotor of horizontal axis wind turbine rotor blades were presented.
本文应该能够消除现今开发周期中一些普遍共有的误解，对对象-关系数据库之间映射所涉及到的一些问题提供了切合实际的看法。
This paper should alleviate several common misconceptions prevalent in development circles today, presenting a practical look at the issues involved with mapping objects to relational databases.
这样，VMware的解决方案就会延长关系数据库的生命周期，使之可以用于之前并不适用的场景当中。
Thus VMware's solution lengthens the life of relational databases that now can be used in scenarios they are normally not fit for. Ramnarayan explains.
在计算高层钢结构地震剪力时，周期应乘以0.9折减系数以考虑非结构构件对刚度的影响。
In calculating the seismic force of high-rise steel structures, the periods should be multiplied by a reduction factor (0.9) to account for the stiffness due to non-structural elements.
应用特征矩阵方法计算周期势垒的反射系数，所得结论与文献结果一致，但计算方法较为简单，并且便于计算机处。
In this paper, the reflexed coefficient of potential barrier of period is calculated by the method of character matrix.
系统设计中详细讨论了间歇驱动周期和输入信号比例放大系数的恰当选取。
The chaotic communication system is applied to speech communication with analysis of the selection of the drive period and the input information signal amplitude.
结果表明，动态自回归模型时变参数（时变系数）的变化是有规律的，其增量大体上是一些简单周期函数的叠加。
The results showed that the change of time-varying parameters (coefficient) in dynamic AR model has a regularity. Its increments are piled up by some simple period functions.
各主优势型对应的时间系数的周期变化主要在2～5年之间。
The time coefficient of each model has a period of 2~5 years.
本文在原有定性分析方法的基础上，提出基于年径流时间序列主周期小波系数加权求和预测周期成分的年径流预测模型。
Based on the primary qualitative method, we propose an annual runoff prediction model using weighted sum of wavelet coefficients of major periods to predict the periodic components.
推导并给出了轴向固有周期下线性加载动力放大系数随线性加载时间的变化关系。
According to axially natural period, the relation of the dynamic magnification factor vs the linearly loading time under linearly loading is deduced and presented.
结构等效质量系数与场地和结构周期的关系。
Relation between the equivalent mass factor of structure and periods of structures on different sites.
虽然成本有所增加，但是产品生产周期会缩短，安全系数更有保障。
The cost will increase, but the production cycle of the products will be shortened, and the safety factor is more security.
根据周期任务和非周期任务对系统风险系数的贡献不同，提出了两层任务分配策略；
The two-level tasks allocation strategy of cycle tasks and un-cycle tasks was put forward because their contributions are difference for the risk coefficient of system.
对周期确定较难的设备，通过静力地震系数法，确定地震作用，以求设备与建(构)筑物处于同等安全度。
If the equipment vibration period is hard to get, we could use the static force seismic coefficient theory to define the seismic effect to ensure the equal safety of the equipment and building.
周期时变线性系统系数矩阵的时变性与不可交换性是其精细积分算法设计中的瓶颈。
The time-varying and incommutable character of the coefficient matrix of periodically time-varying linear systems are the bottleneck of the design for high precision direct integration methods.
然而用传统的设计方法进行设计非常复杂、繁琐、周期较长而且计算结果难免有过大的安全系数，不利于充分发挥设备能力。
But the conventional design way is very complex, and the safety factor figured out with traditional design pattern is a bit of bigger, and this makes against exerting the ability of devices.
正弦型来流使压力系数产生波动，程度受正弦周期、振幅影响；
The fluctuant is different with the influence of period and swing of the sine wave.
结果表明电子的透射系数随外环半长及两个气泡半周长的改变均做周期性振荡。
We found that the transmission of electrons oscillates periodically with the change of ring's half length or two bubbles' half circumferences.
对系数是概周期函数的传染病s IS模型进行了研究，得到了概周期解存在惟一的一个充分条件。
An epidemic SIS model whose coefficient is almost periodic functions is studied. A sufficient condition of existence and uniqueness of positive periodic solution is obtained.
结果表明：(1)序列脉冲的一个周期内，增益系数大致在阈值上下波动，显示了增益饱和效应。
The results indicate: (1) the gain coefficient fluctuates across the threshold in a period of the pulse trains, it appears as the gain saturation.
用周期性系数的平均值法获得了不稳定频率的近似值。
By using the mean values of the periodic coefficients, the approximations of the unstable frequencies are obtained.
首先，利用自相关系数和偏自相关系数图以及二阶自回归模型对机动车辆保险的周期存在性进行定性与定量分析。
Firstly, the thesis tests the existence of U/W cycle in Chinese motor insurance through the analysis of the autocorrelation and partial autocorrelation and the test of two order autoregression.
首先，利用自相关系数和偏自相关系数图以及二阶自回归模型对机动车辆保险的周期存在性进行定性与定量分析。
Firstly, the thesis tests the existence of U/W cycle in Chinese motor insurance through the analysis of the autocorrelation and partial autocorrelation and the test of two order autoregression.
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